Patent Publication Number: US-2022218123-A1

Title: Product Management Display System

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/917,398 filed Jun. 30, 2020, which is a continuation of U.S. application Ser. No. 16/365,896 filed Mar. 27, 2019, now U.S. Pat. No. 10,702,075, which is a continuation of U.S. application Ser. No. 15/817,877 filed Nov. 20, 2017, now U.S. Pat. No. 10,278,516, which is a continuation of U.S. application Ser. No. 14/930,391 filed on Nov. 2, 2015, now U.S. Pat. No. 9,820,584, which is a continuation of U.S. application Ser. No. 14/245,779 filed on Apr. 4, 2014, now U.S. Pat. No. 9,173,504, which is a continuation-in-part of U.S. application Ser. No. 14/166,552 filed on Jan. 28, 2014, now U.S. Pat. No. 9,265,358, which is a continuation-in-part application of U.S. application Ser. No. 14/136,029, filed on Dec. 20, 2013, now U.S. Pat. No. 9,138,075, which is a continuation-in-part application of U.S. application Ser. No. 13/839,674, filed Mar. 15, 2013, now U.S. Pat. No. 8,978,904, which claims priority to U.S. Application No. 61/757,479, filed on Jan. 28, 2013 and which is a continuation-in-part application of U.S. application Ser. No. 13/542,419, filed Jul. 5, 2012, now U.S. Pat. No. 8,739,984, which is a continuation-in-part application of U.S. application Ser. No. 12/639,656 filed Dec. 16, 2009, now U.S. Pat. No. 8,322,544, which is a continuation-in-part application of U.S. application Ser. No. 12/357,860, filed Jan. 22, 2009, now U.S. Pat. No. 8,453,850, which is a continuation-in-part application of U.S. application Ser. No. 11/760,196, filed Jun. 8, 2007, now U.S. Pat. No. 8,312,999, which is a continuation-in-part application of U.S. application Ser. No. 11/411,761, filed Apr. 25, 2006, now U.S. Pat. No. 7,823,734, which claims benefit to United States Provisional Application Nos. 60/716,362, filed Sep. 12, 2005, and 60/734,692, filed Nov. 8, 2005, all of which are incorporated herein fully by reference. U.S. application Ser. No. 13/542,419 also claims benefit to U.S. Provisional application Ser. Nos. 61/530,736 filed Sep. 2, 2011, 61/542,473 filed Oct. 3, 2011, and 61/553,545 filed Oct. 31, 2011, all of which are incorporated fully herein by reference. U.S. application Ser. No. 14/136,029 also claims priority to U.S. Provisional Application No. 61/861,843, filed on Aug. 2, 2013, which is incorporated herein fully by reference. U.S. application Ser. No. 14/166,552 also claims priority to U.S. Provisional Application No. 61/861,843, filed on Aug. 2, 2013, which is incorporated herein fully by reference. 
    
    
     FIELD 
     The exemplary embodiments relate generally to a shelf assembly for use in merchandising product and more particularly to a shelf assembly having improved mechanisms for displaying and pushing product on the shelves. 
     BACKGROUND 
     It is known that retail and wholesale stores, such as convenience stores, drug stores, grocery stores, discount stores, and the like, require a large amount of shelving both to store product and to display the product to consumers. In displaying product, it is desirable for the product on the shelves to be situated toward the front of the shelf so that the product is visible and accessible to consumers. In the case of coolers or refrigerators that are used to store and display such products as soft drinks, energy drinks, bottled water, and other bottled or canned beverages, it is desirable for these products to also be situated toward the front of the shelf and visible and accessible to the consumers. 
     To accomplish this placement of product, known systems may include inclined trays or floors that through gravity will cause the product to move toward the front of the shelf. Many of these systems include floors or shelves made of a plastic material such as polypropylene that due its low coefficient of friction permit the product to easily slide along the inclined floor or surface. However, over time, these surfaces can become obstructed with debris or sticky substances that inhibit the product from properly sliding, sometimes causing several products to tip over thus blocking additional product from moving to the front of the shelf. 
     Other systems include the use of a pusher system to push the product toward the front of the shelf as the product at the front of the shelf is removed. The known pusher systems are typically mounted to a track and include a pusher paddle and a coiled spring to urge the product forward. Occasionally, as the system is used, and over time, the track becomes obstructed with dirt or sticky materials that hinder the proper operation of the pusher system in the track. In addition, depending on the size, shape and weight of the product to be merchandised, the known pusher paddles may occasionally tip or bend backwards, thereby causing a binding of the pusher mechanism in the track. In those situations, the pusher mechanism may not properly push product toward the front of the shelf. 
     One exemplary embodiment is directed at improving upon existing merchandising systems by providing a trackless pusher system that works with gravity-fed merchandise systems (i.e., inclined shelves or trays) and non-gravity-fed merchandise systems. 
     SUMMARY 
     One exemplary embodiment is directed to a product management display system for merchandising product on a shelf. This embodiment includes using a trackless pusher mechanism that travels along a surface on which product is placed. The trackless system overcomes the known problems with the use of tracks to hold and guide the known pusher mechanisms. It should be understood however that the teachings of this embodiment may be used with systems that include tracks for mounting a pusher mechanism or the like. 
     The pusher mechanism can include a pusher paddle and a floor that extends forward of the pusher paddle. A flat coiled spring or other biasing element can be operatively connected behind the pusher paddle and extend across the floor of the pusher mechanism and to the front of the shelf. Alternatively, the flat coiled spring or biasing element can extend across the divider to the front of the shelf assembly. With this configuration, the pusher paddle is prevented from tipping or bending backwards during operation. 
     An exemplary embodiment also includes the use of a pushing mechanism with the merchandising of product on horizontal or non-inclined shelves or surfaces, as well as with gravity-fed systems, or systems that use gravity as a mechanism to urge product toward the front of the shelf. 
     In accordance with an exemplary illustrative embodiment of the invention, the pusher paddle may define a concave pushing surface for pushing cylindrical products, such as soft drink bottles or cans, and to keep the paddle centered on the track and behind the product. Alternatively, the pusher paddle may define a flat pushing surface that may further include at its upper edge a curved rib or similar structure that can also be used to push cylindrical products. 
     In accordance with another exemplary illustrative embodiment of the invention, the floor of the pusher mechanism can include a notched or cut-out portion to align the pusher mechanism relative to the coiled spring. Also, the floor of the system also can include a notch or cut-out portion for receiving and mounting a flat end of the coiled spring to the floor. A spring tip may be placed on the end of the coiled spring to mount the coiled spring to the floor of the system. Alternatively, the end of the coiled spring can mount to the divider of the assembly. 
     In accordance with yet another exemplary embodiment, an adaptor for a product management display system may be positioned on a floor surface of the display system. The adaptor may include a planar surface with at least two ribs extending outwardly from the planar surface and across the planar surface in a substantially parallel manner. A coiled spring may be positioned between the parallel extending ribs. With this configuration, product to be merchandised may sit on the ribs, and not directly on the coiled spring, to enhance the forward movement of certain types of product, such as cans of a beverage. 
     In yet another alternative aspect, a mounting member may be used to mount the end of the coiled spring to the floor of the system. For those systems that include spaced-apart glide rails that are joined together by connecting ribs, the mounting member may be snap-fit to or otherwise mounted on the floor and between the glide rails. 
     In yet another alternative aspect, the trackless pusher system is retrofitted into an existing shelf assembly. This allows for the placement of the trackless pusher system in an existing shelving system as a low cost alternative to purchasing the entire trackless pusher assembly. 
     In another exemplary embodiment, the coil spring can be mounted to the retainer. An end of the coil spring can be directly mounted to the retainer or alternatively the end can be mounted to the retainer via an adapter. The adapter can have a curved portion which is received in a correspondingly shaped curved slot in the retainer to secure the end of the spring to the display assembly. 
     In another exemplary embodiment, the trays can be attached via a dovetail connection to form a shelf assembly. Additionally the dividers can be adjusted such that the width of the product rows can be adapted to receive different sized products. 
     In accordance with yet another exemplary embodiment, the product management display system can be arranged in a stackable arrangement. The assembly can be provided with a first tray and a second tray each having a first wall and a second wall. The first and second trays are each adapted to receive a pusher mechanism, and a retainer mechanism. First and second spacers are mounted to the first and second trays for stacking the first and second trays on top of one another. The first and second spacer can be provided with a plurality of detents, and the first tray and the second tray can each be provided with a plurality of correspondingly shaped sockets for receiving the plurality of detents. 
     In accordance with yet another exemplary embodiment, a product management display system for merchandising product on a shelf includes using a trackless pusher mechanism that travels along a surface on which product is placed and one or more dividers for separating product into rows. The one or more dividers may be attached and releasably engaged to a front rail. When the one or more dividers are not engaged and held in position to the front rail, the one or more dividers and product positioned on the display system may be moved in a lateral direction, or may be lifted away from the front rail. This permits ease of replanogramming of product on the shelf. The one or more dividers may releasably engage to the front rail through the use of corresponding teeth, resilient surfaces, a locking tab, a locking bar, a cam and/or through a friction or press fit. 
     In an example, a merchandise display system includes a front rail and at least one divider configured to engage the front rail. The at least one divider includes a barrier and the at least one divider further includes a divider wall. The at least one divider also includes a divider floor perpendicular to the divider wall, wherein the divider floor is configured to hold product. The merchandise display system also includes a cam coupled to the divider, wherein the cam is configured to move between a first position and a second position. The at least one divider is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the first position. The at least one divider is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the second position. 
     In an example, a merchandise display system includes a front rail and a plurality of dividers configured to attach to the front rail and separate product into rows. Each of the plurality of dividers includes a divider wall extending in a direction perpendicular to the front rail, a divider floor perpendicular to the divider wall, wherein the divider floor is configured to hold product, and a cam coupled to the divider, wherein the cam is configured to move between a first position and a second position. Each of the plurality of dividers is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when each of the plurality of dividers is engaged with the front rail and the cam for each of the plurality of dividers is in the first position. In addition, each of the plurality of dividers is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail when each of the plurality of dividers is engaged with the front rail and the cam for each of the plurality of dividers is in the second position. 
     In an example, a merchandise display system includes a front rail and at least one divider configured to attach to the front rail, the at least one divider including a barrier, a divider wall extending in a direction perpendicular to the front rail, a divider floor perpendicular to the divider wall, wherein the divider wall separates the divider floor into a first portion and a second portion and each of the first portion and the second portion are configured to hold product. The merchandise display system also includes a first pusher mechanism configured to slide along at least part of the first portion, a second pusher mechanism configured to slide along at least part of the second portion, and a cam coupled to the at least one divider, the cam configured to move between a first position and a second position. The at least one divider is movable in a lateral direction parallel to and along the front rail when the cam is in the first position, and the at least one divider resists movement in the lateral direction parallel to and along the front rail when the cam is in the second position. 
     In an example, a merchandise display system includes a front rail and at least one divider configured to attach to the front rail, the at least one divider including a barrier configured to engage the front rail, a divider wall extending in a direction perpendicular to front rail, a divider floor perpendicular to the divider wall, wherein the divider floor configured to hold product. The display system also can include a resilient tab coupled to the divider, the resilient tab configured to move between a first position and a second position. The at least one divider is fixed in a lateral direction parallel to the front rail when the resilient tab is in the first position. The at least one divider is movable in the lateral direction parallel to the front rail when the resilient tab is in the second position. 
     In an example, a merchandise display system includes a front rail, the front rail comprising at least one first projection and at least one first recess, and at least one divider configured to attach to the front rail, the at least one divider comprising a divider wall and a divider floor perpendicular to the divider wall, the at least one divider further comprising at least one second recess and at least one second projection, the at least one second projection of the divider configured to move between a first position and a second position, The at least one divider is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when the at least one first projection of the front rail is engaged with the at least one second recess of the divider and the at least one second projection of the divider is in the first position. The at least one divider (a) resists movement in the lateral direction parallel to the front rail and (b) is secured in a direction perpendicular to the front rail when the at least one first projection of the front rail is engaged with the at least one second recess of the divider and the at least one second projection of the divider is in the second position. 
     In an example, a merchandise display system includes a front rail, the front rail including at least one first projection and at least one second projection, the at least one second projection of the front rail configured to move between a first position and a second position. The merchandise display system also includes at least one divider configured to attach to the front rail, the at least one divider comprising a divider wall and a divider floor perpendicular to the divider wall, the at least one divider further comprising at least one recess. The at least one divider is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when the at least one first projection of the front rail is engaged with the at least one recess of the divider and the at least one second projection of the front rail is in the first position. The at least one divider is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail when the at least one first projection of the front rail is engaged with the at least one recess of the divider and the at least one second projection of the front rail is in the second position. 
     In an example, a merchandise display system includes a front rail, the front rail comprising a first projection and a second projection. The merchandise display system also includes at least one divider configured to attach to the front rail, the at least one divider comprising a divider wall and a divider floor perpendicular to the divider wall, the at least one divider further comprising a recess and a third projection. The at least one of the second projection or the third projection is a movable projection that is movable between a first position and a second position. The at least one divider is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when the first projection of the front rail is engaged with the recess of the divider and the movable projection is in the first position. The at least one divider is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail when the first projection of the front rail is engaged with the recess of the divider and the movable projection is in the second position. 
     In an example, a merchandise display system includes a front rail, the front rail comprising at least a first engaging member. The merchandise display system also includes at least one divider configured to attach to the front rail, the at least one divider comprising a divider wall and a divider floor perpendicular to the divider wall, the at least one divider further comprising at least a second engaging member. The merchandise display system also includes a third engaging member configured to move between a first position and a second position. The at least one divider is (a) movable in a lateral direction parallel to the front rail and (b) secured in a direction perpendicular to the front rail when the first engaging member of the front rail is engaged with the second engaging member of the divider and the third engaging member is in the first position. The at least one divider is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail when the first engaging member of the front rail is engaged with the second engaging member of the divider and the third engaging member is in the second position. 
     In an example, a merchandise display system includes a front rail and at least one divider configured to engage the front rail, the at least one divider including a barrier, the at least one divider further including a divider wall, the at least one divider further including a divider floor perpendicular to the divider wall, wherein the divider floor is configured to hold product. The merchandise display system also includes a cam coupled to the divider, wherein the cam is configured to move between a first position and a second position. The at least one divider can be secured in a direction perpendicular to the front rail when the at least one divider is engaged with the front rail. The cam can inhibit movement of the at least one divider in the lateral direction parallel to the front rail when the cam in in the first position and the cam can allow movement of the divider in the lateral direction parallel to the front rail when the cam is in the second position. The merchandise display system can include a handle to rotate the cam between the first position and the second position. The merchandise display system can include a handle to slide the cam between the first position and the second position. 
     In another exemplary embodiment, a merchandise display system includes a front rail defining a rail groove and a divider configured to engage the front rail. The divider includes a barrier, a divider wall, and a divider floor extending perpendicular to the divider wall. The divider floor further includes a top surface to hold product and a bottom surface. The merchandise display system also includes a cam rotatably coupled to the divider. The cam is configured to rotate between a first position and a second position. The cam defines a cam glide that extends beneath the bottom surface of the divider floor and contacts the front rail when the cam is in the first position. In operation, the divider is movable in a lateral direction parallel to the front rail when the cam is in the first position and the cam glide contacts the front rail, and the divider is fixed in the lateral direction parallel to the front rail when the cam is in the second position and in contact with the rail groove of the front rail. With this embodiment, the cam is at all times in contact with the front rail, regardless of whether the cam is in the first position or the second position, or in a position in-between the first and second positions. 
     In an alternative aspect, the cam includes a handle to rotate the cam between the first position and the second position, and the cam can include one or more cam surfaces configured to engage one or more groove walls in the rail groove when the cam is in the second position. Additionally, the cam glide may define an elongated planar surface. Also, the merchandise display system may include a pusher mechanism having a pusher surface and a pusher floor extending forwardly from the pusher surface. A coiled spring having a coiled end may be positioned behind the pusher surface and a free end of the spring may attach the pusher mechanism to the merchandise display system. Alternatively, the barrier may be configured to receive the free end of the coiled spring. In yet another alternative aspect, the front rail may define a ridge configured to engage a groove in the divider. 
     In another exemplary embodiment, a merchandise display system includes a front rail and at least one divider configured to attach to the front rail. The at least one divider may include a barrier and a divider wall extending in a direction perpendicular to the front rail. The divider may include a divider floor perpendicular to the divider wall and the divider wall separates the divider floor into a first portion and a second portion and each of the first portion and the second portion are configured to hold product. Additionally, the merchandise display system includes a first pusher mechanism configured to slide along at least part of the first portion and a second pusher mechanism configured to slide along at least part of the second portion. The merchandise display system includes a cam coupled to the at least one divider. The cam defines a cam glide and is configured to move between a first position and a second position. In operation, the at least one divider is movable in a lateral direction parallel to and along the front rail when the cam is in the first position and the cam glide is in contact with the front rail, and the at least one divider resists movement in the lateral direction parallel to and along the front rail when the cam is in the second position and the cam glide is not in contact with the front rail. 
     In an aspect, the first and second pusher mechanisms each include a pusher surface, a pusher floor extending forwardly from the pusher surface, and a coiled spring having a coiled end and a free end. The coiled end is positioned behind the pusher surface and the free end attaches the first and second pusher mechanisms to the merchandise display system. 
     In an alternative aspect, the at least one divider may define a divider engaging member and the at least one front rail may define a front rail engaging member. The divider engaging member is configured to engage the front rail engaging member. The divider engaging member may define divider teeth on at least one surface of the divider engaging member. The front rail engaging member may define front rail teeth on at least one surface of the front rail engaging member. The divider teeth are configured to engage the front rail teeth. 
     In another exemplary embodiment, a merchandise display system includes a front rail and at least one divider configured to engage the front rail. The at least one divider includes a barrier, a divider wall, and a divider floor perpendicular to the divider wall. The divider floor is configured to hold product. The merchandise display system also includes a cam coupled to the divider. The cam is configured to move between a first position and a second position. The cam defines a cam glide for lifting the divider up off of the front rail when the cam is in the first position. The at least one divider is secured to the front rail when the cam is in the second position and the cam glide is moved away from the front rail. In an aspect, the at least one divider is movable in the plane of a shelf only in the lateral direction parallel to the front rail and the at least one divider is fixed in the plane of the shelf in all directions other than the direction parallel to the front rail when the at least one divider is engaged with the front rail. In another aspect, the cam may include a handle to rotate the cam between the first position and the second position. Additionally, the cam glide may define an elongated planar surface having an edge that permits slidable movement of the cam glide relative to the front rail. 
     In another exemplary embodiment, the merchandise display system may include a front rail and at least one divider configured to engage the front rail. The divider may include a barrier, a divider wall, and a divider floor perpendicular to the divider wall configured to hold product. A front lock may be coupled to the divider. In an aspect, the front lock may be configured to rotate, pivot or move between a first position and a second position. When in the first position, the front lock may permit slidable movement of the divider relative to the front rail. In an alternative aspect, the front lock may lift the divider up off of the front rail. When in the second position, the front lock locks the divider to the front rail and prevents slidable movement between the divider and the front rail. 
     In another exemplary embodiment, the merchandise display system may include a divider secured to a support structure. The divider may include a divider wall and a divider floor. The divider wall may extend upwardly from the divider floor and the divider floor may include a top surface. The system may further include a barrier that is moveable by rotation between a folded position and an upright position without a rotation biasing element. A product positioned on a top surface of the divider floor can contact the barrier when the product moves toward the forward end of the divider and rotate the barrier from the folded position to the upright position. The barrier may be configured to cease the forward movement of the product when the barrier is in the upright position. The system may include a rotational mounting structure to which the moveable barrier is connected. The rotational mounting structure may be removably connected to the forward end of the divider. 
     In another exemplary embodiment, the merchandise display system may be used in conjunction with a product tray for restocking of the system with product. The product tray may include a bottom surface, right side wall, left side wall, and an alignment flap. The alignment flap may include a proximate end, distal end, right edge, and left edge. A flap width of the alignment flap may be defined in between the right edge and the left edge. The proximate end of the alignment flap may be connected to the bottom surface of the product tray and the alignment flap may be configured such that a least a portion of the flap width is about equal to a width of product stored in the product tray. The alignment flap may be positioned in between opposing divider walls of a merchandise display system in which a product pocket is defined in between the opposing divider walls. The alignment flap aligns the product tray and the product stored in the product tray with the product pocket so that the product stored in the product tray can be slid from in the product tray into the product pocket of the merchandise display system. 
     In another exemplary merchandise display system, the display system may include a pusher extender that increases the pushing surface of the pusher. The pusher extender may define an elongated pusher body having a cavity. The pusher extender may be configured to slide over the pusher wall via the cavity like a sleeve. The pusher extender with an enlarged, substantially planar surface thereby creates an enlarged pushing surface for pushing larger products toward the front of the display system. 
     In an exemplary merchandise display system, the display system may be mounted to a rear hang bar located towards the back of the shelf. A hanger may be positioned within a cavity formed in the divider and extend the length of the divider. The hook end of the hanger may then be positioned on the hang bar and the entire system may cantilever out from the hang bar. 
     In another example, a merchandise display system can include at least one divider including a barrier, the at least one divider further including a divider wall and a divider floor perpendicular to the divider wall. The divider floor can be configured to hold product. The example merchandise display system can also include a pusher mechanism having a pusher surface, a pusher floor extending forwardly from the pusher surface, and a coiled spring having a coiled end and a free end. The pusher mechanism can also include a pusher extender that increases the pusher surface of the pusher mechanism. 
     An example merchandise display system can also include a hanger that is configured to be inserted underneath the divider or within a cavity formed in the divider. The hanger can be elongated and substantially planar, and the hanger can be formed with a hook at one end thereof, which can be configured to mount on a hang bar to suspend the at least one divider and the pusher mechanism. The pusher extender can further include an elongated pusher body having a cavity. The pusher extender can be configured to slide over the pusher surface via the cavity to create an enlarged, substantially planar pushing surface for the pusher. The divider can include a notch portion on a rear end of the divider floor, and the notch portion may permit the divider to rest on a flange of a hang bar. The notch portion may extend the width of the divider floor to create a contact line that extends the width of the divider to stabilize the divider on the hang bar. A divider extender can be configured to attach to the divider, for example, the divider extender can be configured to slide into a cavity formed by the divider. The coiled end of the spring can be positioned behind the pusher surface, and the pusher mechanism is guided in a track on the divider floor. The barrier can be configured to receive the free end of the coiled spring. 
     In another example, a merchandise display system can include a pusher mechanism having a pusher surface, and a coiled spring having a coiled end and a free end, and a retainer configured to limit the movement of product. However, the pusher surface can be angled with respect to the retainer. The pusher mechanism may include a pusher paddle and a pusher extender configured to fit over the pusher paddle and the pusher extender can include the pusher surface. The pusher extender may also include at least one tab which is configured to aid in securing the pusher extender into place over the pusher paddle. The pusher extender may also include at least one projection which is configured to align with a corresponding groove located on the pusher paddle to aid in securing the pusher extender into place over the pusher paddle. The pusher extender may also define an elongated pusher body having a cavity. A divider may be provided and configured to separate products, and a divider extender may be configured to attach to the divider. For example, the divider extender may be configured to slide into a cavity formed by the divider. 
     In another example, a merchandise display system may include a front rail configured to mount to a shelf, and at least one roller carriage configured to connect to the front rail. The roller carriage may include a plurality of rollers, the plurality of rollers being configured to advance product. A barrier can be located adjacent to an end of the roller carriage, and a cam can be coupled to the barrier. The cam can be configured to move between a first position and a second position. The roller carriage can be (a) movable in a lateral direction parallel to the front rail and can be (b) secured in a direction perpendicular to the front rail when the roller carriage is engaged with the front rail and the cam is in the first position. The roller carriage can be (a) fixed in the lateral direction parallel to the front rail and can be (b) secured in the direction perpendicular to the front rail when the roller carriage is engaged with the front rail and the cam is in the second position. 
     In another example a merchandise display system may include a front rail configured to mount to a shelf and at least one divider defining a first end and a second end. The divider can be configured to engage the front rail and the at least one divider may include a barrier located at the first end. The at least one divider may also include a divider wall, and a roller carriage extending along the divider wall. The roller carriage can be provided with a plurality of rollers, and the roller carriage can be configured to advance the product. Additionally a cam can be coupled to the divider. The cam can be configured to move between a first position and a second position. The at least one divider can be movable in a lateral direction parallel to the front rail and can be secured in a direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the first position. The at least one divider can be fixed in the lateral direction parallel to the front rail and can be secured in the direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the second position. The cam may also include a handle to rotate the cam between the first position and the second position. The cam may also include one or more cam walls configured to engage one or more groove walls in the front rail when the cam is in the second position. The front rail can also define a front rail groove, and the divider can also define a divider ridge configured to engage the front rail groove. 
     Additionally, the roller carriage can be tilted such that the product is configured to move toward the barrier. The roller carriage can be formed of a first portion and a second portion, and the roller carriage can provided with a plurality of axles that are configured to receive the plurality of rollers such that the plurality of rollers are configured to rotate on the roller carriage. Additionally, the axles can be tapered to receive the rollers. The roller carriage may include a scalloped floor having a series of rounded portions which can be configured to receive the rollers during assembly. The first portion and the second portion of the roller carriage are provided with a plurality of fingers that are configured to engage to secure the first portion and the second portion of the roller carriage. The first portion and the second portion can be formed identically. 
     An example method of assembling a merchandise display system can include providing a front rail configured to mount to a shelf, forming at least one divider configured to engage the front rail, providing the at least one divider with a barrier, a divider wall, and a divider floor extending perpendicular to the divider wall, forming a roller carriage with a plurality of rollers and configuring the roller carriage to connect to the divider floor to advance product; and providing the divider with a cam coupled to the divider and configuring the cam to move between a first position and a second position. 
     The method can also include configuring the at least one divider to move in a lateral direction parallel to the front rail and to be secured in a direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the first position, and configuring the at least one divider to be fixed in the lateral direction parallel to the front rail and to be secured in the direction perpendicular to the front rail when the at least one divider is engaged with the front rail and the cam is in the second position. The method can also include providing the cam with one or more cam walls configured to engage one or more groove walls in the front rail when the cam is in the second position and tilting the roller carriage such that product is configured to advance toward the barrier when in the merchandise display system. 
     The method may also include forming the roller carriage of a first portion and a second portion, providing the roller carriage with a plurality of axles that are configured to receive the plurality of rollers and configuring the plurality of rollers to rotate on the roller carriage, tapering the axles to receive the rollers, forming a series of rounded portions in the roller carriage for receiving the rollers during assembly. Additionally, the first portion and the second portion of the roller carriage can be provided with a plurality of fingers that are configured to engage to secure the first portion and the second portion of the roller carriage. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  depicts an isometric exploded view of an exemplary embodiment of a product management display system of the present invention. 
         FIG. 2  depicts an isometric view of an exemplary pusher mechanism mounted to an exemplary tray or product channel of the present invention. 
         FIG. 3  depicts another isometric view of the system of  FIG. 2  with product placed in the system. 
         FIG. 4  depicts another isometric view of the system of  FIG. 2  with multiple product placed in the system. 
         FIG. 5  depicts an isometric rear view of the system of  FIG. 4 . 
         FIG. 6  depicts an alternative embodiment of the tray or product channel of the present invention. 
         FIG. 7  depicts an exemplary tip for an end of a coiled spring that may be used with the product management display system of the invention. 
         FIG. 8  depicts the exemplary tip of  FIG. 7  being mounted to a surface of a tray or product channel. 
         FIG. 9  depicts the exemplary tip of  FIG. 7  being mounted to an end of a coiled spring. 
         FIG. 10  depicts the exemplary tip of  FIG. 7  mounted to an end of a coiled spring. 
         FIG. 11  depicts an isometric view of an alternative exemplary embodiment of a product management display system of the present invention. 
         FIG. 12  depicts another isometric view of the system of  FIG. 11 . 
         FIG. 13  depicts a front view of the system of  FIG. 11 . 
         FIG. 14  depicts a top view of the system of  FIG. 11 . 
         FIG. 15  depicts a rear view of the system of  FIG. 11 . 
         FIG. 16  depicts an isometric view of an adaptor that may be used with the invention. 
         FIG. 17  depicts a front view of the adaptor of  FIG. 16 . 
         FIG. 18  depicts an exemplary installation of the adaptor of the invention. 
         FIG. 19  depicts an isometric view of an installed adaptor of the invention. 
         FIG. 20  depicts a front view of an installed adaptor of the invention. 
         FIG. 21  depicts an isometric view of an alternative exemplary embodiment of a product management display system of the present invention. 
         FIG. 22  depicts an isometric bottom view of an exemplary mounting member that may be used to mount the end of the coiled spring to the floor of the display system. 
         FIG. 23  depicts an isometric top view of the exemplary mounting member of  FIG. 22 . 
         FIG. 24  depicts the exemplary mounting member of  FIG. 22  mounted to the end of the coiled spring with the coiled spring mounted to an exemplary pusher paddle. 
         FIG. 25  depicts another view of the exemplary mounting member of  FIG. 22  mounted to the end of the coiled spring with the coiled spring mounted to an exemplary pusher paddle. 
         FIG. 26  depicts the exemplary mounting member of  FIG. 22  with attached coiled spring being mounted to the floor of the system. 
         FIG. 27  depicts the exemplary mounting member of  FIG. 22  installed on the floor of the system. 
         FIG. 28  depicts an isometric view of an alternative exemplary embodiment of a product management display system of the present invention. 
         FIG. 29  depicts a close-up isometric view of the tray of the exemplary embodiment of  FIG. 28 . 
         FIG. 29A  depicts a cross-sectional view of the exemplary embodiment of  FIG. 28  illustrating a first securing method. 
         FIG. 29B  depicts a cross-sectional view of the exemplary embodiment of  FIG. 28  illustrating a second securing method. 
         FIG. 30  depicts a close-up isometric view of the embodiment of  FIG. 28  illustrating a rivet attaching the spring to the tray. 
         FIG. 31  depicts an isometric view of the embodiment of  FIG. 28  being assembled in a preexisting wire shelf. 
         FIG. 32  depicts an isometric view of the embodiment of  FIG. 28  assembled in a preexisting wire shelf. 
         FIG. 33  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 34  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 35  depicts an isometric view of an exemplary embodiment of an adapter. 
         FIG. 36  depicts an isometric view of an exemplary embodiment of a retainer. 
         FIG. 37  depicts a side view of an exemplary embodiment of the display system. 
         FIG. 38  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 39  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 40  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 41A  depicts a sectional side view of an exemplary embodiment of a divider. 
         FIG. 41B  depicts a front view of an exemplary embodiment of the display system. 
         FIG. 41C  depicts a close up view of a section of  FIG. 41B . 
         FIG. 41D  depicts a front view of an exemplary embodiment of a divider. 
         FIG. 42  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 43  depicts an isometric view of an exemplary embodiment of the display system. 
         FIG. 44  depicts an isometric view of an exemplary embodiment of a product management display system. 
         FIG. 45  depicts another isometric view of an exemplary embodiment of a product management display system with product in the system. 
         FIG. 46  depicts a top view of another exemplary embodiment of a product management display system with product in the system. 
         FIG. 47  depicts an isometric-rear view of an exemplary embodiment of a product management display system with product in the system. 
         FIG. 48  depicts an isometric view of an exemplary embodiment of the pusher mechanism mounted to a divider. 
         FIG. 49  depicts another isometric view of the divider and pusher mechanism being assembled to the product management display system. 
         FIG. 50  depicts an isometric view of yet another exemplary embodiment of the product management display system. 
         FIG. 51  depicts another isometric view of the exemplary embodiment of the product management display system of  FIG. 50  without product. 
         FIG. 52  depicts an exploded isometric view of the exemplary embodiment of the product management display system of  FIG. 50 . 
         FIG. 53  depicts an isometric view of yet another exemplary embodiment of the product management display system. 
         FIG. 54  depicts an isometric view of an exemplary attachment of the pusher spring to a shelf of the product management display system of  FIG. 53 . 
         FIG. 55  depicts an isometric view of an exemplary attachment of the pusher spring to a shelf of the product management display system of  FIG. 53 . 
         FIG. 56  depicts an isometric view of an exemplary attachment of the pusher spring to a shelf of the product management display system of  FIG. 53 . 
         FIG. 57  depicts an isometric view of an exemplary attachment of the pusher spring to a shelf of the product management display system of  FIG. 53 . 
         FIG. 58  depicts an isomeric view of an exemplary embodiment of the product management display system in accordance with one or more aspect of the disclosure. 
         FIG. 59  depicts an isometric view of the exemplary product management display system of  FIG. 58 . 
         FIG. 60  depicts an isometric view of an exemplary pusher mechanism in accordance with one or more aspects of the disclosure. 
         FIG. 61  depicts a partial isometric view of an exemplary divider in accordance with one or more aspects of the disclosure. 
         FIG. 62  depicts an isometric view of an exemplary divider and pusher mechanism in accordance with one or more aspects of the disclosure. 
         FIG. 63  depicts a partial isometric view of an exemplary front portion of a divider in accordance with one or more aspects of the disclosure. 
         FIG. 64  depicts a partial isometric view of an exemplary front portion of a front rail in accordance with one or more aspects of the disclosure. 
         FIG. 65  depicts a partial isometric view of an exemplary connection between a divider and a front rail in accordance with one or more aspects of the disclosure. 
         FIG. 66  depicts a side view of an exemplary divider and front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 67A-C  depict side views of an exemplary divider attaching to a front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 68A-C  depict side views of an exemplary divider attaching to a front rail in accordance with one or more aspects of the disclosure. 
         FIG. 69A  depicts an isometric view of exemplary rail mounting clips for a front rail in accordance with one or more aspects of the disclosure. 
         FIG. 69B  depicts an isometric view of an exemplary front rail in accordance with one or more aspects of the disclosure. 
         FIG. 70  depicts an isometric view of an exemplary front rail and rail mounting clips in accordance with accordance with one or more aspects of the disclosure. 
         FIG. 71  depicts an isometric view of an exemplary front rail in accordance with one or more aspects of the disclosure. 
         FIG. 72  depicts an isometric view of an exemplary divider and pusher mechanism in accordance with one or more aspects of the disclosure. 
         FIG. 73  depicts an isometric view of an exemplary divider and pusher mechanism in accordance with one or more aspects of the disclosure. 
         FIG. 74  depicts a partial isometric view of an exemplary divider in accordance with one or more aspects of the disclosure. 
         FIG. 75  depicts a partial isometric view of an exemplary front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 76A and 76B  depict partial isometric views of an exemplary front rail and a cam bar lever in accordance with one or more aspects of the disclosure. 
         FIG. 77  depicts a front exploded view of an exemplary product management display system in accordance with one or more aspects of the disclosure. 
         FIG. 78  depicts a back exploded view of an exemplary product management display system in accordance with one or more aspects of the disclosure. 
         FIGS. 79A-C  depict side views of an exemplary front rail and divider in accordance with one or more aspects of the disclosure. 
         FIG. 80  depicts an isometric view of an exemplary product management display system in accordance with one or more aspects of the disclosure. 
         FIGS. 81A-B  depict partial side views of an exemplary front rail and divider in accordance with one or more aspects of the disclosure. 
         FIGS. 82A-C  depict partial side views of an exemplary front rail and divider in accordance with one or more aspects of the disclosure. 
         FIGS. 83A-C  depict partial side views of an exemplary front rail and divider in accordance with one or more aspects of the disclosure. 
         FIGS. 84A-F  depict isometric views of an exemplary product management display system in accordance with one or more aspects of the disclosure. 
         FIG. 85  depicts a side view of an exemplary divider and front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 86A-L  depict views of components of an exemplary product management display system in accordance with one or more aspects of the disclosure. 
         FIGS. 87A-C  depict side views of exemplary dividers and front rails in accordance with one or more aspects of the disclosure. 
         FIGS. 88A-B  depict isometric views of an exemplary divider in accordance with one or more aspects of the disclosure. 
         FIGS. 89A-C  depict side views of an exemplary divider attaching to a front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 90A-F  depict views of an exemplary divider attaching to a front rail in accordance with one or more aspects of the disclosure. 
         FIG. 91A  depicts a view of an exemplary divider and a rear rail in accordance with one or more aspects of the disclosure. 
         FIG. 92  depicts an exploded view of an exemplary divider and rail in accordance with one or more aspects of the disclosure. 
         FIGS. 93A-B  depict views of an exemplary divider mounting to a front rail in accordance with one or more aspects of the disclosure. 
         FIGS. 94A-C  depict cross-section views of the movement of an exemplary cam used with a divider and front rail in accordance with one or more aspects of the disclosure. 
         FIG. 95  depicts a top, right perspective view of aspects of example components of a merchandise display system. 
         FIGS. 96A and 96B  are top, right perspective views of aspects of example components of a merchandise display system. 
         FIG. 97  is a top, right perspective exploded view of aspects of example components of a merchandise display system. 
         FIGS. 98A-C  are side views of aspects of example components of a merchandise display system. 
         FIGS. 99A-C  are side views of aspects of example components of a merchandise display system. 
         FIGS. 100A-D  are a top, left perspective views of aspects of example components of a merchandise display system. 
         FIG. 101A  is a top, right perspective view of aspects of an example product tray. 
         FIG. 101B  is a top view of aspects of an example product tray. 
         FIGS. 101C-F  are top, left perspective views of aspects of an example product tray used in conjunction with example components of a merchandise display system. 
         FIG. 102A  is a top, right perspective view of aspects of example components of a merchandise display system. 
         FIG. 102B  is a top, right perspective exploded view of aspects of example components of a merchandise display system. 
         FIGS. 102C and 102D  are side views of aspects of example components of a merchandise display system. 
         FIG. 103A  is a top, front, right perspective view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 103B  is a top, rear, right perspective view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 103C  is a rear view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 103D  is a top view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 103E  is a right side view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 104A  is a top, right perspective exploded view of aspects of example components of a merchandise display system. 
         FIG. 104B  is a top, right perspective view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 104C  is a bottom, right perspective view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 104D  is a front view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 104E  is a top view of aspects of example components of a rotational mounting structure of a merchandise display system. 
         FIG. 104F  is a left side view of aspects of example components of a rotational mount structure of a merchandise display system. 
         FIG. 104G  is a bottom view of aspects of example components of a rotational mount structure of a merchandise display system. 
         FIGS. 105A-D  are side views of aspects of example components of a merchandise display system. 
         FIG. 106A  is a top, right perspective exploded view of aspects of example components of a merchandise display system. 
         FIG. 106B  is a side view of aspects of example components of a merchandise display system. 
         FIGS. 107-135  depict perspective views of an alternative embodiment of a product management display system. 
         FIG. 136  depicts a perspective rear view of another alternative embodiment of a product management display system. 
         FIGS. 137, 139, and 143  depict various perspective views of another alternative embodiment of a product management display system. 
         FIGS. 138 and 140-142  depict various perspective views of another alternative embodiment of a product management display system. 
       FIGS.  144 A 1  and  144 A 2  illustrate perspective views of another example divider. 
         FIG. 144B  illustrates an exploded view of a roller carriage. 
         FIG. 144C  illustrates an exploded view of a manufacturing method of the roller carriage. 
       FIG.  144 C 1  illustrates an enlarged section of  FIG. 144C . 
         FIG. 144D  illustrates another aspect of the joining method of  FIG. 144C . 
         FIG. 144E  illustrates the joining method of  FIG. 144C  in a near final assembly. 
         FIG. 144F  shows a bottom view of the assembled roller carriage according to the method shown in  FIG. 144C . 
         FIG. 144G  illustrates a perspective view of the example roller carriage. 
         FIG. 144H  illustrates an exemplary roller. 
         FIGS. 145A-146B  depict perspective views of exemplary front rails. 
     
    
    
     Before the embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including” and “comprising” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items and equivalents thereof. Further, the use of the term “mount,” “mounted” or “mounting” is meant to broadly include any technique or method of mounting, attaching, joining or coupling one part to another, whether directly or indirectly. 
     DETAILED DESCRIPTION 
     The invention may be embodied in various forms. Referring to the Figures wherein like numerals indicate like elements, there is depicted in  FIG. 1  an isometric exploded view of an exemplary embodiment. Exemplary merchandise system  10  includes a product dispensing tray  12  in which is mounted an exemplary trackless pusher mechanism  14 . As described in more detail below, the pusher mechanism  14  will fit in the tray  12  and will slide along the surface of the tray without the use of tracks, rails, or guides typically used to hold a conventional pusher mechanism to the tray or floor of the tray. The pusher mechanism defines a pusher paddle and a pusher floor that extends forward of the pusher paddle. A coiled spring may extend across the pusher floor and operatively connect to the tray at a forward position on the tray. In one aspect of the invention, product to be merchandised may be placed in the tray in front of the pusher paddle and may sit on the pusher floor as well as the coiled spring. With this configuration, the weight of the product will prevent the pusher paddle from tipping to ensure proper pushing of the product. In addition, the problems associated with debris or sticky materials hindering the effectiveness of known pusher systems that use tracks, rails or guides have been eliminated. Other aspects, embodiments and features of the invention and its teachings are set forth in more detail below. 
     The exemplary tray  12  may define a surface  16  and one or more dividing panels or dividers  18  to separate the tray into numerous rows for placement of product. In an alternative aspect, the tray  12  may be a shelf or any other surface on which products may be placed for merchandising. The surface  16  may be a solid surface or a surface defining a plurality of spaced-apart apertures  20  separated by a plurality of support ribs  22 . The apertures  20  and ribs  22  provide a surface that permits the slidable movement of product placed on this surface and also permits liquids and dirt to pass through the apertures  20  so that they do not collect on the surface  16 . The surface  16  may be made of any suitable material that permits the slidable movement of product on the surface  16 . Other surface or floor configurations are known and may be used with the principles of the invention. 
     As depicted in  FIGS. 9 and 10 , the surface  16  may define a rounded end portion  24  that includes a notch or cut-out portion  26 . The end portion  24  may be rounded to match the shape of the product that is placed on the tray. For example, the depicted end portion  24  is rounded or defines a semi-circular shape to match the contour of a bottle or can that may be placed in the tray and on the end portion  24 . Other shapes of the end portion may be used with the invention depending on the product to be merchandised. 
     The notch  26  may be used to receive and mount an end  29  of a coiled spring  30  or similar biasing element. The notch  26  may define opposing angled edge surfaces  32  that are joined by edge  34 . The edge  34  is preferably centered across the width of the product row formed in the tray  12  and extends perpendicular to the length of the tray. This configuration will center the coiled spring  30  relative to the tray  12  and will permit the spring to extend in a substantially parallel manner relative to the length of the tray. In other words, the depicted edge  34  of the notch  26  will permit the spring  30  to extend along the length of the tray  12  at or near the center of the product row formed by the tray. One skilled in the art will appreciate that the location and configuration of the notch may vary depending on the desired placement of the spring. 
     The coiled spring  30  may define an end  29  that is configured to be placed across the notch  26  and onto the edge  34 . In one aspect, the end  29  of the coiled spring may be V-shaped and function as a hook such that the end  29  will wrap around the edge  34  with a portion of the end  29  of the coiled spring extending beneath the end portion  24  of the surface  16 . This configuration permits an easy installation of the coiled spring onto the tray. 
     In another aspect, and referring to  FIG. 7 , a spring tip  60  may be added to the end  29  of the spring  30  to assist with the mounting of the spring to the system. The spring tip  60  may define numerous shapes and configurations depending on the configuration of the tray and the surface on which the spring end needs to attach. The spring tip  60  may be permanently attached to the end  29  of the coiled spring  30  or it may be detachable to permit the interchange or replacement of the spring tip  60 . The spring tip  60  may be made of plastic and may define one or more apertures. Aperture  61  may be used to receive the end  29  of the coiled spring  30 . A second aperture  63  may be used to receive a mating tongue or mounting member  65  extending from the surface  16  of the tray  12 , as discussed below. With this configuration, the end  29  of the coiled spring  30  may be operatively connected to the tray  12 . 
     In another aspect, the end  29  of the coiled spring may snap-fit into an aperture formed in the surface  16 , or may be otherwise inserted and secured to an aperture or opening in the tray, thereby securing the end  29  of the coiled spring  30  in position. 
     Referring back to  FIG. 1 , dividers  18  may also be used to separate product into rows. The dividers  18  extend substantially upwardly from the surface  16  and as illustrated in  FIG. 1 , may be positioned on opposing sides of the surface  16 . Alternatively, the dividers  18  may be positioned at any desired position on the tray  12  or to the surface  16 . The dividers  18  may be formed as a unitary structure with the surface  16 , or the dividers  18  may be detachable to provide added flexibility with the system. The dividers may be attached to a front or back rail depending on the system. The dividers  18  may define numerous configurations and may extend upwardly any desired distance to provide the desired height of the dividers between the rows of product to be merchandised. This height may be adjustable by adding divider extenders or the like. 
     Located at the front of the tray  12  and extending between the dividers  18  may be one or more product-retaining members  44 . The product-retaining members  44  serve as a front retaining wall or bar to hold the product in the tray  12  and to prevent the product from falling out of the tray  12 . These members are also configured to permit the easy removal of the forward-most product positioned in the tray  12 . The product-retaining member  44  may be one or more curve-shaped retaining ribs as depicted in  FIG. 1 . These illustrated retaining ribs may extend from one divider to another divider thereby joining the dividers. The retaining ribs may also extend part-way between the dividers, as also shown in  FIG. 1  as rib  46 , to also assist in retaining the product in the tray. Alternatively, and as shown in  FIG. 6  the product-retaining member  44  may be a curve-shaped solid retaining wall  48  that extends between dividers. The retaining wall  48  may be transparent or semi-transparent to permit visualization of the product on the shelf. In another aspect, the retaining wall  48  may also extend part-way between the dividers  18 . In yet another embodiment depicted in  FIGS. 11-15 , the retaining wall  100  may be attached to the surface of the tray and not connect to the dividers. In this embodiment, the retaining wall  100  may form an opening  102  defined by an upper member  104 , opposing, curved side walls  106  that further define an angled edge  108 , and a floor member  110 . The side walls  106  may also be straight and not curved depending on the system. The end of the coiled spring may also snap-fit into the floor  110  or otherwise attached to the tray using any of the techniques described herein. One of skill in the art will readily appreciate that there are numerous shapes and configurations possible for the product-retaining member  44  and that the depicted configurations are merely exemplary embodiments of these numerous configurations. 
     Referring back to  FIG. 1 , the exemplary trackless pusher mechanism  14  defines a pusher paddle  50  and a pusher floor  52 . The pusher paddle  50  and pusher floor  52  may be formed as a single, unitary structure or may be separate structures that are joined together using known techniques. In addition, the pusher paddle  50  and pusher floor  52  may be made of any known suitable plastic or metal material. The pusher paddle and pusher floor may be reinforced using any known reinforcing techniques. 
     In one aspect, the pusher paddle  50  forms a curved-shape pusher surface or face  54  that is configured to match the shape of the product to be merchandised, such as plastic bottles or cans containing a beverage, as depicted in  FIGS. 3-5 . The curve-shaped pusher surface  54  permits the pusher to remain centrally aligned with the last product in the tray. This configuration reduces friction and drag between the pusher and the divider walls. In an alternative aspect, the pusher surface or face may be a flat surface. In yet another aspect, the flat pusher surface may be accompanied by a curved shaped rib that is positioned near or on the top of the pusher paddle and that may be used to center and align product in the tray, in a manner similar to the curve-shaped pusher surface  54  depicted in  FIG. 1 . The curve shaped rib may define other shapes and configurations that permit cylindrical or similar shaped products to be properly pushed in the tray. Advertisement, product identification or other product information may be placed on the pusher surface  54 . 
     Positioned behind the pusher surface or face  54  may be one or more support members  58 , such as ribs, walls, or gussets. The support members  58  are configured to support the pusher surface  54  and further connect the pusher paddle  50  to the pusher floor  52 . As can be seen in  FIG. 5 , positioned between the support members  58  is the coiled spring  30 , and more specifically the coiled end  57  that is used to urge the pusher paddle  50  forward and along the tray  12 , as understood in the art. Any technique used to operatively connect the coiled spring to the pusher paddle  50  may be used with the invention. 
     As shown in  FIG. 1 , the pusher floor  52  may be positioned below the pusher paddle  50  and may extend forward of the pusher surface  54  of the pusher paddle. The pusher floor  52  may extend any predetermined distance and at any predetermined angle. For example, the pusher floor  52  may extend substantially perpendicular to the pusher surface  54 . In the exemplary embodiment, the pusher floor  52  may extend a sufficient distance to permit one product, such as a single bottle or can, to be placed on the pusher floor. In another aspect, the pusher floor  52  may be configured to permit more than one product to be placed on the pusher floor. The pusher floor  52  may define any shape, including the depicted round shape and may define any product retaining features on the surface of the pusher floor, such as ribs, walls, or the like, to further hold the product on the pusher floor. 
     As can be seen in  FIG. 2 , the pusher floor  52  may define an elongated channel, groove or recessed portion  59  that is sized, shaped and configured to seat the coiled spring  30 . In the exemplary embodiment, the channel or groove  59  may extend across the floor  52  and in a substantially perpendicular manner relative to the pusher paddle  50 . In an alternative aspect, the groove or channel may extend part-way or across the entire pusher floor  52 , as shown in  FIG. 19 . Such configuration permits the proper alignment and positioning of the pusher paddle  50  in the tray. The groove  59  may define a depth that matches or exceeds the thickness of the coiled spring  30 . With this configuration, the coiled spring  30  will seat at or below the pusher floor surface such that product will not sit directly on the coiled spring, rather, such product will sit on the pusher floor surface. As shown in  FIG. 19 , the pusher floor may include apertures and openings through which debris or other items may pass. Alternatively, the floor may be a solid surface. 
     In an alternative aspect of the invention, as shown in  FIGS. 16-20 , an adaptor  180  may be positioned on the surface  16 . Referring to  FIGS. 16 and 17 , the adaptor  180  may include one or more raised ribs  182  on which a product may sit. The raised ribs  182  may extend longitudinally along the length of the adaptor  180 . The adaptor  180  may be a flat extrusion of plastic material (or any other suitable material) defining a planar surface  184  with the one or more ribs  182  extending outwardly from the planar surface  184 . The adaptor  180  may define a rounded end  185  and include a notch or cut-away portion  186  through which or across which the coiled spring may extend. The rounded end  185  may be configured to match the shape of the product that is placed on the tray. Other shapes of the end  185 , notch  186  and adaptor  180  may be used with the invention depending on the product to be merchandised. The adaptor  180  may be a separate, insertable piece or, alternatively, a piece formed integral with the surface  16 . 
     Referring to  FIG. 18 , the adaptor  180  may be easily insertable onto the surface  16  and between the dividers  18 . Referring to  FIG. 19 , once the adaptor  180  is installed, the pusher mechanism  14  may be positioned on top of the adaptor  180  and may slide freely across the ribs  182  of the adaptor  180 . The coiled spring  30  may extend in a parallel manner between the ribs  182  and may seat at or below the top surface of the ribs  182 , as more clearly shown in  FIG. 20 . With this configuration, the product to be merchandised may sit on, and slide along, the ribs  182  and not on the coiled spring  30 . 
     In an alternative aspect, the ribs  182  may be a raised bead or raised beads, or a series of fingers that may be used to facilitate the movement of the product on the surface  16 . In yet another alternative embodiment, the ribs  182  may be product moving members, such as runners or one or more rollers or rolling members that permit the product to roll across the rolling members and toward the front of the product display system. Exemplary roller assemblies include those disclosed and described in U.S. application Ser. No. 11/257,718 filed Oct. 25, 2005 and assigned to RTC Industries, Inc, which application is incorporated herein by reference. As should be appreciated by those skilled in the art, there are many possible techniques that may be used with the described pusher mechanisms for facilitating the movement of the product on the shelf or floor. 
     The underneath side of the pusher floor  52  may be a smooth planar surface that will slide freely along the surface  16 . Alternatively, and similar to above, the pusher floor  52  may include beads, runners, rollers or the like that will permit the pusher floor to slide along the surface yet raise the pusher floor up off of the surface  16 . In another alternative embodiment, the underneath side of the pusher floor may be configured with rail mounting members to permit the mounting of the pusher to a track or rail, as understood in the art. 
     The pusher floor further defines a notch or cut-out portion  62  through which will pass the coiled spring  30 . The end  29  of the coiled spring  30  will pass through the notch  62  and through the notch  26  of the surface  16  and will mount to the tray using any of the techniques described above. 
     In use, as the pusher mechanism  14  is urged rearward in the tray  12 , the end  29  of the coiled spring  30  will be held in position as described above and the coiled end  57  of the spring  30  will begin to uncoil behind the pusher paddle  50 . If the pusher  14  is allowed to move forward in the tray  14 , such as when product is removed from the front of the tray, the coiled end  57  of the spring  30  will coil and force the pusher paddle  50  forward in the tray  12 , thereby urging product toward the front of the tray. 
     In an alternative embodiment, the coiled spring  30  may extend below and underneath the pusher floor  52  as opposed to above and across the pusher floor, as depicted in the figures. With this configuration, the groove  59  and notch  62  may not be necessary. 
     The coiled spring  30  may be any biasing element including, without limitation, a flat coil spring commonly used with pusher systems. The present invention may use one or more coiled springs to urge the pusher mechanism  14  forward depending on the desired application. The coil tension of the spring  30  may also vary depending on the particular application. 
     Referring to  FIG. 2 , the trackless pusher mechanism  14  is shown mounted to the tray  12 . As illustrated, the pusher mechanism  14  fits in the tray  12  between the dividers  18 . End  29  of the coiled spring  30  extends through the notch in the pusher floor and mounts to the tray as described above. In use, the pusher mechanism  14  will slide along the surface  16  of the tray  12  without the use of tracks, rails, or guides. As depicted in  FIG. 2 , the pusher mechanism  14  is shown in a forward position. 
     Referring to  FIG. 3 , the pusher mechanism  14  is shown merchandising one product  70  in the merchandise system  10 . The product is prevented from tipping out of the tray by the product-retaining member  44 . The product  70  may be any product to be merchandised including the depicted soft drink bottle. As shown in this Figure, the product  70  sits on the pusher floor  52  and the coiled spring  30  that extends below the product. The weight of the product on the floor  52  and the positioning of the product across the spring  30  prevent the paddle  50  from tipping in the tray  12 . 
     Referring to  FIG. 4 , the pusher mechanism  14  is shown merchandising multiple products  70  in the merchandise system  10 . As shown in this Figure, the product next to the pusher paddle  50  sits on the pusher floor  52  and the coiled spring  30  that extends below the product. The other products will sit on the coiled spring  30  that will extend below these products. Alternatively, the adaptor  180  may be positioned in the system in which case the product may sit on the ribs  182  of the adaptor as opposed to the coiled spring. Again, the weight of the product on the pusher floor  52  and the positioning of the products across the spring  30  prevent the paddle  50  from tipping in the tray. In use, as one product is removed from the front of the tray near the product-retaining member  44 , the pusher mechanism  14  (through the urging of the coiled spring  30 ) will push the remaining product forward in the tray  12  until the forward-most product contacts the product-retaining member  44 . As additional products are removed, the pusher mechanism  14  will continue to push the remaining product toward the product-retaining member  44 . 
     Referring to  FIG. 5 , a rear view of the pusher mechanism  14  shows the pusher mechanism  14  merchandising multiple products  70  in the merchandise system  10 . Again, the product next to the pusher paddle  50  sits on the pusher floor  52  and the coiled spring  30  that extends below the product. The other products will sit on the coiled spring that will extend below these products. Alternatively, the adaptor  180  may be positioned in the system in which case the product may sit on the ribs  182  of the adaptor as opposed to the coiled spring. As one product is removed from the front of the tray near the product-retaining member  44 , the coiled end  57  of the spring  30  will urge the pusher paddle  50  of the pusher mechanism  14  forward in the tray  12  until the forward-most product contacts the product-retaining member  44 . As can be seen in this Figure, the coiled end  57  may be positioned between two support members  58 . The support members will retain the coiled spring between these members. As can be seen in this Figure, the pusher floor  52  may also extend below the support members  58 . 
     Referring to  FIG. 6 , an alternative embodiment of the pusher tray is depicted. With this embodiment, multiple trays  12  may be formed into a single multi-tray assembly  80 . The multi-trays may have a common floor with dividers  18  extending upwardly from the floor to create the multiple trays or rows. In this embodiment, the product-retaining member  44  may be a solid member that extends between two dividers, as discussed above. One or more of the multi-tray assemblies  80  may be coupled or joined together in a side-by-side manner using any known technique, including clips, dovetailing, fasteners, or the like. With this configuration, numerous rows of product can be provided for the merchandising of numerous products. 
     As stated above, the trackless pusher mechanism  14  may be used with gravity-fed systems, that is, systems having trays or product channels that are mounted on an incline to permit gravity to assist with the merchandising of the product. Alternatively, the trackless pusher mechanism  14  may be used with systems that are mounted in a non-inclined or in a horizontal manner where gravity will provide little or no assistance with the merchandising of the product. The trackless pusher mechanism  14  may also be used to push various shaped products. 
       FIG. 7  depicts an exemplary tip  60  for the end  29  of a coiled spring  30  that may be used with the merchandise system  10 . As illustrated, the tip  60  defines an aperture  61  for receiving the end  29  of the coiled spring and an aperture  63  for mounting to the surface  16  of the tray. As can be seen in  FIG. 7 , in one aspect of an alternative embodiment, extending beneath the surface  16  may be a tongue or mounting member  65  that may be configured to mate with the aperture  63  and to snap-fit the tip  60  onto the tongue  65  and thus to the surface  16 . 
     Referring to  FIG. 8 , the exemplary tip  60  of  FIG. 7  is shown being mounted to the tongue or mounting member  65 . The tongue  65  may include an elongated outwardly extending rib  67  that is used to snap-fit the tip  60  onto the tongue  65 . One skilled in the art will appreciate that other techniques may be used to mount the tip  60  to the surface  16  and that the depicted technique is merely an exemplary embodiment of one such technique. 
     Referring to  FIG. 9 , the exemplary tip  60  is shown fully mounted in a snap-fit manner to the surface  16 , and more specifically to the end portion  24  of the surface  16  of the tray  12 . Also depicted is the mounting of the end  29  of the coiled spring  30  to the aperture  61  of the tip  60 . As shown in  FIG. 9 , the end  29  of the coiled spring may be inserted into the aperture  61 . The aperture  61  is configured to receive the end  29  of the coiled spring and hold the end  29  in position, and to also permit the removal of the end  29  of the coiled spring from the aperture  61  in those circumstances where it is desirable to disconnect the coiled spring from the tip to permit the removal of the pusher mechanism  14  from the system. 
     Referring to  FIG. 10  there is shown the end  29  of the coiled spring fully mounted to the exemplary tip  60 . As illustrated in this figure, the coiled spring  30  is now operatively connected to the surface  16  of the tray  12 . As a result, the pusher mechanism  14  is now mounted to the tray  12 . 
     Referring to  FIGS. 21-27  there is shown an alternative technique for mounting the end  29  of the coiled spring  30  to the merchandise display system. A mounting member  130  may be used to mount the end  29  of the coiled spring to the floor  131  of the system. For those systems that include spaced-apart glide rails  132  that are joined together by connecting ribs  134  ( FIGS. 26-27 ), the mounting member  130  may be snap-fit to or otherwise mounted on the floor  131  and between the glide rails  132 . The mounting member will thus hold the end of the coiled spring in position and to the floor of the system. 
     Referring to  FIGS. 22-23 , the mounting member  130  may include one or more legs  136  on one or more sides of the member  130 . The legs may be configured to snap-fit to the underside of the rails  132  to thereby hold the mounting member  130  to the floor of the system. The legs  136  may include legs ends  137  defining an L-shape or angled surfaces that are configured to contact the underside of the rail  132  and prevent the mounting member  130  from being lifted up from the floor, except by the intentional flexing of the legs out from the underside of the rail  132 . The legs  136  may contact the connecting ribs  134  which will prevent slidable movement of the mounting member  130  relative to the floor. Referring to  FIG. 26 , the mounting member  130  is shown being mounted to the floor of the system and more specifically to the rails.  FIG. 27  illustrates that the mounting member  130  remains in position as the pusher paddle  141  is pulled away from the front of the system. The mounting member  130  may be connected to this type of system floor  131  using other techniques. For example, a separate mounting clip, one or more fasteners, adhesives, or other techniques may be used to secure the mounting member  130  to the floor  131 . 
     Referring to  FIGS. 22-23 , the mounting member  130  may also include an aperture or opening or slot  138  that will receive the end  29  of the spring. The spring may be mounted using any of the techniques described herein, or other techniques. The configuration of the aperture  138  and mounting member  130  will hold the spring in position on the mounting member  130 , similar to the technique described above. 
     The mounting member  130  may also include glide ribs  139  on a top surface that allow product placed thereon to slide more easily across the mounting member after the mounting member is installed to the floor of the system. The mounting member  130  may also include an elongated flat body  140  that extends forward of the location of the legs  136  to provide stability to the mounting member  130  after it is mounted to the floor of the system. 
     Referring to  FIGS. 24-25 and 27 , the pusher paddle or pusher mechanism  141  may include a pusher face  143  configured to match the shape of the product against which it pushes. As illustrated, the pusher face  143  may be curve shaped to match the shape of a bottle or other cylindrical object. The pusher paddle  141  may also include a pusher floor  145  similar to the pusher floor configurations described above. The pusher floor  145  may further include a spring sleeve  147  that receives the coiled spring  30  to shield and protect the spring. The spring sleeve  147  may extend partly or fully across the pusher floor  145  and in the direction of the spring  30 . The spring sleeve  147  may have a relatively short height and a flat surface  149  to permit product to sit thereon without significant tipping or leaning of the product. 
     The pusher paddle  141  may be positioned on top of the floor  131  to glide on top of the surface, as described above. The pusher paddle may be positioned between two product divider walls  153  that are joined together by a product retaining member  155 . Additional product retaining members  157  may extend outwardly from the product dividers. 
     Referring to  FIGS. 28 and 29  there is shown yet another alternative technique for mounting the end  29  of the coiled spring  30  to the merchandise display system. In this embodiment, the end  29  is riveted to the tray  216 . 
     Referring to  FIGS. 28-32  in an alternative embodiment, the trackless pusher system may be retrofitted to an existing shelf assembly  230 , which may have product dividers already built in. For example, in one embodiment, the trackless pusher system may be retrofitted to an existing wire shelf assembly. Referring to  FIGS. 30-32 , a tray or adaptor  216  may have a glide floor  222  that may be sized to a single lane of the shelf  234  or sized to an entire shelf width. The glide floor  222  may include several raised ribs  224 , which help to reduce friction for the products merchandised on the tray  216 . It should be understood that one or more raised ribs  224  may be used with the glide floor  222 . Alternatively, the glide floor  222  may be a flat, planar surface without raised ribs. The tray or adaptor  216  may be configured similar to the adaptor  180  of  FIG. 16 . 
     As shown in  FIGS. 28 and 30 , the end  29  of coiled spring  30  may be riveted, via a rivet  229 , to the front end  228  of the tray  216 , or may be attached by any other attachment technique. The tray  216  can be retained to the shelf by any attachment technique suitable for the particular shelf. In one embodiment, and as illustrated in  FIGS. 29-32 , the tray  216  may include one or more outwardly extending fingers or snaps  220 , which may engage one or more individual wires  232  of the shelf  234  to retain the tray  216  on the shelf  234 . The fingers or snaps  220  may extend longitudinally along the length of the tray  216 , or may be spaced apart along the length of the tray. The snaps  220  may be used to snap-fit the tray  216  to the existing wire shelf. As depicted in  FIGS. 29A and 29B , the snaps  220 A and  220 B may define numerous configurations that permit the tray  216  to be snap fit to the shelf. The embodiment depicted in  FIGS. 28-32  allows for the placement of the trackless pusher system in an existing shelving system, such as a wire shelf system, as a low cost alternative to the entire trackless pusher assembly. It should be understood that with this embodiment, any pusher mechanism described herein may be used. 
     As depicted in  FIGS. 33 and 44 , in another exemplary embodiment, the display management system comprises one or more pusher mechanisms  286 , one or more dividers  266 , one or more trays  306 , and one or more retainers  250 . The pusher mechanisms  286  can be formed of a pusher paddle  287  and a pusher floor  288 . Product is placed on the pusher floor  288  and guided to the front of the display management system via the dividers  266  and the pusher paddle  287 . The coiled spring  30  biases the pusher mechanism  286  toward the retainer  250  such that product moves to the front of the system. 
     In one exemplary embodiment, depicted in  FIG. 33 , the coiled spring  30  can be mounted to the retainer  250 . Alternatively, the coiled spring  30  can be mounted to a divider  266  (also shown in  FIGS. 48 and 49 ). The coiled spring  30  can be directly mounted to the retainer  250 , as depicted in  FIG. 33 , or can be mounted to the retainer  250  via a separate adapter  252 , as depicted in  FIG. 34 . 
     As depicted in  FIG. 35 , the adapter  252  has a wall  254  proximate a first end  256 . The first end  256  has a curved portion  262 , which curves upwardly. The middle portion of the adapter  252  may be provided with a curved slot  260 , which is adapted to receive a correspondingly shaped spring end (not shown). 
     The coiled spring  30  at one end can be secured to the middle portion of the adapter  252 . In an exemplary embodiment, the curved slot  260  corresponds in shape and size of the first spring end. Additionally, the first spring end of the coiled spring  30  can be crimped or bent to provide for additional fastening. Nevertheless, any sufficient fastening method can be used to fix the first spring end of the coiled spring  30  to the adapter  252 . 
     In an exemplary embodiment, shown in  FIGS. 36 and 37 , the retainer  250  has a curved slot  284  corresponding in shape and size to the curved portion  262  of the adapter  252 . The curved slot  284  extends the length of the retainer to allow for unlimited positioning of the adapter  252  along the length of the retainer  250 . 
     To secure the first spring end of the coiled spring  30  to the retainer  250 , the curved portion  262  of the adapter  252  is placed into the curved slot  284  of the retainer  250 . The curved slot  284  secures the adapter  252  and the first spring end of the coiled spring  30  to the retainer  250  and provides for a quick and easy assembly of the display system. The wall  254  provides additional stability in the connection between the retainer  250  and the adapter  252 . Other methods, however, can be used to secure the adapter  252  and/or the first spring end of the coiled spring  30  to the retainer  250 . 
     Alternatively, as depicted in  FIGS. 33 and 44  the coiled spring  30  of the pusher paddle  287  can be mounted directly to the front of the tray  306 . The first spring end  290  of the coiled spring  30  is provided with a curved portion. The curved portion curves downwardly from the pusher floor  288  and is adapted to be received in a recess  316  (shown in  FIG. 33 ) defined by a lip  318  of the front surface of the dispensing tray  306  and the retainer  250 . A vertically oriented surface of the retainer  250  and the lip  318  are spaced such that a gap is formed between the vertically oriented surface and a front edge of the lip  250 . To secure the coiled spring  30  and the pusher mechanism  286  to the assembly, the first spring end  290  is inserted into the gap formed between the vertically oriented surface of the retainer  250  and the front edge of the lip  318  and placed into the recess  316  formed by the lip  318  of the dispensing tray  306  and the retainer  250 . 
     In another exemplary embodiment depicted in  FIGS. 38, 39, 48 and 49 , the coiled spring  30  can be directly mounted to a divider  266 . In addition, in this exemplary embodiment the coiled spring  30  can be mounted perpendicular to the pusher floor  288  such that the axis, about which the coiled spring  30  is coiled, is perpendicular to the pusher floor  288 . This orientation has the benefit of preventing the pusher paddle from tipping back. The first spring end  290  can be provided with an angled portion  292  and a tip portion  296 . In one exemplary embodiment, the angled portion  292  can be bent perpendicular to the coiled spring body  294 . The divider can be provided with a slot  298 , which is adapted to receive the tip portion  296  of the first spring end  290 . 
     To secure the coiled spring to the divider, the tip portion  296  is inserted into the slot  298 . Once the tip portion  296  is fully inserted into the slot  298 , the angled portion  292  engages the slot  298  so as to secure the first spring end  290  to the divider  266 . 
     As depicted in  FIG. 33 , various pusher mechanism designs can be implemented. The pusher paddle  287  can be formed flat to accommodate correspondingly shaped product. Alternatively, the pusher paddle  286  can have a curved first end and a flat second end. This serves to accommodate a variety of cylindrical products having a variety of different sized diameters and to facilitate the operation of the pusher mechanism  286 . During operation, the product in the pusher mechanism  286  and the curved first end together force the pusher mechanism against the divider  266 , such that the coil spring  30  remains flat against the divider  266  holding the first spring end  290 , while in tension or in operation. This allows for a smoother operation of the pusher mechanism and ensures that the product is properly dispensed as users remove the product from the system. 
     In another exemplary embodiment depicted in  FIGS. 40-41D , the distance between the dividers  266  can be adjusted to accommodate different sized containers. The dividers  266  can be provided with connecting portions  272 . The connecting portions  272  can be provided with a first elongated angled surface  268  and a second elongated angled surface  270 . Additionally, the connecting portions  272  can be provided with a plurality of projections  274 . As depicted in  FIG. 41B , the rails can be formed of teeth  278  having face surfaces  280  and flank surfaces  282 . 
     When assembled, as depicted in  FIG. 41C , the connecting portions  272  are received between the teeth  278  of the rails. Additionally, the elongated angled surfaces  268  and  270  and the projections  274  are wedged between the teeth  278 . Also as shown in  FIG. 41C , the elongated angled surfaces  268  and  270  engage the face surfaces  280 , and the projections  274  engage the lower surfaces of the teeth  278 . Flank surfaces  282  contact the connecting portion  272 . 
     In an exemplary embodiment depicted in  FIG. 42 , the trays  306  are provided with dovetail connections. A first side  308  of the trays  306  is provided with tongues  312  adapted to fit within grooves  314  located on a second side  310  of the trays  306 . To connect the trays, the grooves  314  are aligned with tongues  312  such that the tongues  312  are firmly secured within the grooves  314 . 
     In an exemplary embodiment depicted in  FIG. 43 , the trays  306  are configured to receive the retainer  250  at a front end. The retainer can be provided with rectangular holes  300 , and the retainer is provided with correspondingly shaped and sized projections  302 . To secure the retainer  250  to the tray  306 , the projections  302  fit into holes  300  to lock the retainer into place on the tray  306 . 
     As depicted in  FIGS. 45-47 , after the product management display system is assembled, product is loaded into the system. By adjusting the dividers  266  a wide variety of product sizes and shapes can be loaded into the system. As shown in  FIGS. 46 and 47 , the coil spring  30  in conjunction with the pusher paddle  287  push the product toward the retainer  250 . As a user takes product out of the system, the pusher paddle  287  pushes the remaining product such that the product slides along the floor  264  to the retainer  250 . This assures that all product remains at the front of the display system. 
     As depicted in  FIGS. 50-52 , the product management display system  400  can be arranged such that trays  402 ,  404  can be stacked on top of one another. This embodiment can consist generally of a first tray  402 , a second tray  404 , a first spacer  406 , and a second spacer  408 . 
     The trays  402 ,  404  are each arranged to house product to be dispensed. The first tray  402  and the second tray  404  can be each provided with a clear retainer  410 , a pusher mechanism  412 , first and second guiding walls, and a coil spring  414 . 
     The pusher mechanism  414  is arranged in a similar fashion as the embodiments discussed above, such that it slides product along the surface of the trays  402 ,  404 , while product is removed. Additionally, any of the alternative arrangements of the pusher mechanism discussed above may be implemented in a stackable tray arrangement. 
     To provide for an easy assembly and disassembly, the stackable product management display system can be provided with a dovetail connection or any other suitable connection, such as a snap-fit connection, screw-thread connection, or a rivet connection. The first and second trays are provided with detents  416  for assembling the first and second spacers  406 ,  408  to the first and second trays  402 ,  404 . Each of the first and second trays  402 ,  404  can be provided with sockets  418  on their respective outside surfaces for receiving the correspondingly shaped detents  416  located on the first and second spacers  406 ,  408 . 
     To assemble the stackable product management display system, the detents  416  located on the first and second spacers  406 ,  408  are placed into the correspondingly shaped sockets  418  on the outside surfaces of the first and second trays  402 ,  404  in a locking arrangement. This provides for a stackable arrangement that can be implemented in conjunction with any of the embodiments discussed above. 
     In another exemplary embodiment depicted in  FIGS. 53-57 , a pusher paddle  500  may be mounted directly to a shelf  508  and held to the shelf by the end of the coiled spring  504 . The pusher paddle  500  will slide along and on top of the surface of the shelf. One or more dividers  502  that define a T-shaped configuration may be positioned next to the pusher paddle  500 . In an alternative aspect, the base of the divider  502  may be positioned on the shelf such that the base is located underneath the pusher paddle  500 . With this configuration, the pusher paddle  500  may slide along the base of the divider. If the dividers  502  are positioned sufficiently far away from the paddle  500 , the paddle  500  will slide directly on the surface of the shelf  508 . The dividers  502  may define numerous configurations including those described herein and may be secured to the shelf using any known technique, including push pins, rivets, fasteners, adhesives and the like. 
     In one aspect, the end  510  of the coiled spring  504  is positioned within a hole or aperture  506  located on the shelf  508 . The end  510  may define a spring tip that may further define any suitable configuration that permits the spring end to pass into the hole  506  and remain secured to the hole. For example, the spring tip of end  510  may define a hook-shaped configuration that permits the end  510  to wrap around the edges of the hole  506 . Alternatively, the spring tip may define one or more catches that hook onto the edges of the hole  506 . Still other spring tip configurations are possible. 
     As shown in  FIG. 54 , to further secure the spring  504  to the shelf  508 , a fastener  512 , pin, rivet or the like may be used. This fastener  512  will provide a second spaced-apart anchoring point for the spring that will hold the spring in the desired alignment during the full operation of the spring  504  as the paddle  500  moves back and forth on the shelf  508 . It will be appreciated that depending on the shelf type and the number and spacing of existing holes on the shelf, even more anchoring points are possible. 
     Referring to  FIGS. 55-57 , there is depicted an exemplary mounting technique for mounting the spring  504  of the paddle  500  onto a shelf. As shown in  FIG. 55 , the end  510  of the spring  504  is inserted into the hole  506  on the shelf. The end  510  may define a spring tip as described herein to hold the end  510  to the edges of the hole  506 . As shown in  FIG. 56 , the spring  504 , which in this embodiment includes a rivet or stud  514 , is lowered onto the shelf such that the rivet or stud  514  fits within another hole  506  located on the shelf. This rivet or stud provides another anchoring point for the spring. As shown in  FIGS. 56 and 57 , the spring  504  may define an aperture  516  for receiving yet another rivet or stud  518  to even further secure the spring  504  to the shelf. With these multiple anchoring points, the spring  504  will be secured to the shelf, and thus the paddle will be secured to the shelf. Also, with these multiple anchoring points, the spring will retain the desired alignment during the full operation of the spring as the paddle moves back and forth on the shelf. It should be understood that other anchoring techniques are possible to secure the end of the spring  504  to the shelf, including any of the technique described herein, or any combination of the techniques described herein. It should be appreciated that if a shelf does not have pre-existing holes that could be used to anchor the spring  504 , one or more holes could be drilled into the shelf at the desired locations. 
     With the embodiment depicted in  FIG. 53-57 , it can be appreciated that a trackless pusher paddle may be retrofitted directly onto existing store shelves with very minimal effort or extra mounting pieces. Additionally, this embodiment is easily removable to permit the repositioning of the pusher paddle at any location on the shelf to accommodate any size and type of product being merchandised on the shelf. One of skill in the art will also appreciate that any of the pusher paddles described herein may be mounted directly to the shelf using the techniques described herein, or by using any combination of the techniques described herein. 
     In an alternative embodiment, as depicted in  FIG. 58 , a display management system is comprised of one or more pushers  520 , one or more dividers  550 , and a front rail  580 . The divider  550  and the front rail  580  can sit on a shelf. The pusher  520  can include a pusher face  522  and a pusher floor  524 , as illustrated in  FIG. 59 . The pusher face  522  can be divided into a non-adjustable portion  526  and pusher extender  528 . The non-adjustable portion  526  and pusher extender  528  both may define a surface that may be used to contact product on the shelf. Both the non-adjustable portion  526  and the pusher extender  528  may define similar heights and depths. The pusher extender  528  can adjust from a position that is flush with and adjacent to the non-adjustable portion  526 , as shown in  FIG. 59 . The pusher extender  528  can be directed downward toward the pusher floor  524  as in  FIG. 60 . The pusher extender  528  can be adjusted to a variety of positions as shown in  FIG. 60 , including a position that is parallel to the pusher floor  524  and a position that is directed upward away from the pusher floor  524  and a position that is directed downward toward the pusher floor  524 . In this manner, the width or the height of the pusher  520  can be effectively extended for wider or taller products. 
     The pusher extender  528  can rotate about an axis on the upper portion of the pusher  520 . A notched wheel  532  (see  FIG. 77 ) can be located behind the pusher extender  528 . The pusher extender  528  includes a protrusion (see, e.g. protrusion  530  in  FIG. 77 ) that fits within the notches in the notched wheel  532 . As the pusher extender  528  rotates, about the axis, the protrusion rotates into the various spaces within the notches in the notched wheel  532 , similar to a pawl and ratchet mechanism. Each notch represents a separate position for the pusher extender  528 . In each separate position, the pusher extender  528  can remain stationary, such that a force is required to move the pusher extender  528  to a different position. In exemplary aspects of the embodiment, the pusher extender may rotate from a first position that is adjacent to the non-adjustable portion  526  to one of numerous second positions that may be located within a range of approximately 180 degrees relative to the first position. The degree of adjustment may vary depending on the number, size and spacing of the notches on the notched wheel. The pusher extender may define a lightener aperture through the wall of the pusher extender to reduce the weight of the pusher extender and to reduce the moment created around the axis of the pusher extender. The pusher extender may define a smooth or textured pusher face. 
     Referring back to  FIG. 59 , a biasing element, such as a coiled spring  534 , can be maintained in a rear portion of the pusher  520 . In an embodiment, the coiled spring  534  can be positioned adjacent the non-adjustable portion  526  of the pusher face  522 . The coiled spring  534  can extend across the pusher floor  524  as shown in  FIG. 59 . In an embodiment, the pusher floor  524  can include a channel  536  in which the coiled spring  534  sits. The channel  536  allows for product to sit on the pusher floor  524  with limited contact with the spring. The weight of the product rests on the pusher floor  524  in this embodiment. The pusher floor  524  also can comprise a surface with no channel. 
     In an example, a divider  550  can be comprised of a divider wall  552 , a floor  554  and a barrier  556 , as illustrated in  FIG. 59 . In an example, a divider  550  can include no barrier. In an example, a divider  550  can include no floor. The divider wall  552  can divide the divider floor  554  into two portions,  559  and  551  (see  FIG. 78 ) with one portion on each side of the divider wall  552 . The divider wall  552  also can have a divider floor  554  on only one side of the divider wall  552 . As illustrated in  FIG. 77 , the divider wall  552  can extend perpendicularly from the divider floor  554 . The divider floor  554  can be a planar surface. In an embodiment, the divider floor  554  can include a channel within a portion of the divider floor  554 . The coiled spring  534  can extend across the divider floor  554 . In an embodiment, the coiled spring  534  can extend across the divider floor  554  within a channel in the divider floor  554 . In this embodiment, product will not rest on the coiled spring  534  and instead will rest on the portions of the divider floor  554  that are adjacent the channel in the divider floor  554 . In another embodiment, the divider floor  554  does not include a channel. In an example, a single pusher  520  can be located on one portion of the divider floor  554  and a second pusher (see  FIG. 84F ) can be located on a second portion of the divider floor  554 . Thus, one divider  550  can contain two pushers  520 , one on each side of the divider wall  552 . 
     The barrier  556  can be configured to restrain product that is being pushed by the pusher  520  and the biasing element contained therein. The barrier  556  can be located at the front of the divider wall  552 , as illustrated in  FIG. 59 . The barrier  556  may also be located at the rear of the divider wall to prevent overstocking of product on the shelf. As shown in  FIGS. 59 and 77 , the divider wall  552  can divide the barrier  556  into two portions. The barrier  556  can be perpendicular to the front end of the divider wall  552 . In an embodiment, the barrier  556 , the divider wall  552  and the divider floor  554  are a single integrated device. These three elements can also be integral with each other. In an example, the barrier is separate from the divider. In an example, the barrier is not integral with or integrated with the divider. In another example, the barrier is configured to engage with the divider. In an example, the divider wall and the divider floor are separate devices from each other and are not integral with each other or part of a single integrated device. In an example, the divider wall and the divider floor are configured to engage with each other. In further examples, a barrier can be connected to the front rail  580  or comprise a portion of the front rail  580 . 
     As illustrated in  FIG. 61 , an end  557  of a coiled spring  534  can be positioned within the barrier  556 . The end  557  of the spring can be folded at an angle to the remainder of the spring. This angle can be 90 degrees or any other suitable angle that may be less than or greater than 90 degrees. The end  557  of the coiled spring can then be placed into a slot  558  within the barrier  556 . Once in the slot  558 , the end of the spring  557  will remain in place and will assist in biasing the pusher  520  toward the barrier  556 . An end  557  of the coiled spring  534  can include a plurality of portions, each with bends that place a subsequent portion of the end of the coiled spring at an angle to a previous portion of the coiled spring (not shown). The plurality of bends can engage a plurality of slots or apertures in the barrier  556  or other connection point on the divider  550  or front rail  580 . The plurality of slots or apertures can conform to the shape of the plurality of bends in the end  557  of the coiled spring  534 . The coiled spring  534  can include a catch (not shown) at one end. The catch in the coiled spring  534  can be configured to prevent the coiled spring  534  from disengaging with the pusher  520 , such as, for example, when the coiled spring  534  is extended. 
     The pusher  520  may be connected to the divider  550  by only the coiled spring  534 . The pusher  520  can sit on top of the divider floor  554  and can slide across the divider floor. The pusher  520  can be configured to rest entirely above the divider floor  554  as shown in  FIG. 59  and not go below the divider floor  554 . In this embodiment, the pusher  520  can be picked up off the divider floor  554  as shown in  FIG. 62 . Gravity and the weight of product sitting on the pusher floor  524  maintain the pusher  520  on the divider floor  554 . Product sitting on the coiled spring  534  also maintains the pusher  520  on the divider floor  554 . The only integrated connection between the pusher and the divider can be the end of the coiled spring  557  that is maintained within a slot  558  in the barrier  556 . The divider wall  552  may be used to guide the pusher  520  as the pusher  520  moves front to back, and vice versa, on the divider floor  554 . 
     The divider  550  can define a groove  560  or other recess in an underside portion of the divider. This groove  560  or other recess can be in the shape of an upside down “u” as shown in  FIG. 61  or can take another shape. The groove  560  or other recess can extend across the full width of the underside portion of the divider  550 . The groove  560 , or other recess in an example, may extend along only a portion of the width of the underside portion of the divider. The groove  560  or other recess may be used to engage a front rail, front wall of a tray, or other structure. The term recess as used herein can mean a groove, slot, channel, indentation, depression or other recess that extends inwardly. 
     The divider  550  also can define a plurality of teeth  562  or other projection. The teeth  562  or other projection can be located at the front portion of the barrier  556 . As illustrated in an exemplary embodiment in  FIG. 63 , the teeth  562  may define a series of outwardly-extending, angled surfaces that meet or join at an apex. As used herein, the term teeth can mean any uniform, non-uniform, continuous, non-continuous, evenly-spaced, or non-evenly-spaced outwardly-extending surfaces that may or may not be angled and that may or may not meet or join at an apex. Additionally, the teeth may define at an apex pointed, blunt, rounded, flat, or polygonal ends, or any other suitable shape. Also, the surfaces that define the shape of the teeth may be flat, convex, concave, smooth or textured, or any other suitable configuration. In an embodiment, the teeth  562  are placed on an extension from the front portion of the barrier  556 . The divider  550  also can define a resilient tongue or tab  564 . The teeth  562  or other projection can be located on the resilient tab  564 . When a force is applied to the resilient tab  564 , the teeth  562  or other projection can move in the direction of the force. When the force is removed, the teeth or other projection will move back to their original position. The term projection as used herein can mean a protrusion, resilient tab, tongue, bump, tooth or plurality of teeth, ridge, knob or other projection that extends outwardly. A plurality of teeth can include a plurality of projections where the teeth extend outwardly and can include a plurality of recesses that extend inwardly between the portions of the plurality of teeth that extend outwardly. 
     A front rail  580  can define a planar surface  582 , a ridge or tongue  584  or other projection or engaging member, a channel or groove  586  or other recess or engaging member and a plurality of teeth  588  or other engaging member. The ridge or tongue  584  or other projection or engaging member of the front rail  580  can be configured to engage the groove  560  or other recess or engaging member of the divider. The ridge  584  or other projection or other engaging member can fit within the groove  560  or other recess or engaging member and inhibit the divider  550  from moving in a direction perpendicular to the ridge  584  or front rail  580  or at an angle (i.e., out of perpendicular) to the ridge  584  or front rail  580 . The teeth  588  or other engaging member of the front rail  580  can be spaced apart. The teeth  588  or other engaging member of the front rail can engage the teeth  562  or other engaging member of the divider  550 , which teeth  562  are illustrated in  FIG. 63 , so as to prevent the divider from moving in a lateral direction parallel to the front rail  580 . The teeth  588  or other engaging member of the front rail  580  are engaged with the teeth  562  or other engaging member of the divider  550  and prevent the divider  550  from moving in the lateral direction shown by arrow “A” in  FIG. 65 . The term engaging member as used herein can mean a projection, recess, planar surface, near-planar surface, or other item of structure that can engage with another item of structure. The front rail may be a separate structure that is attached or coupled to a shelf. Alternatively, the front rail may be part of a tray that defines one or more of a front, back and opposing side walls. In this configuration, the front rail, as described herein, may be formed as part of a front or back wall of a tray and still achieve the objectives of the invention. That is, the front rail may be formed as part of the tray walls (or attached to the tray walls) and receive and engage the dividers and pusher mechanisms using any of the various techniques described herein. The front rail also need not be located in the absolute front of a shelf. The front rail can be located near the front of the shelf or in a location a distance back from the front of the shelf. In an example, the front rail can be located at or near the rear of the shelf, away from the front of the merchandise display system. The front of the shelf can include no rail in an example. 
     When the resilient tab  564  of the divider  550  is pressed or a force is placed on the resilient tab in a direction away from the teeth  588  in the front rail  580 , the teeth  562  of the divider can become disengaged with the teeth  588  on the front rail. When the teeth  588  on the front rail and the teeth  562  on the resilient tab  564  on the divider  550  are disengaged, the divider  550  can be moved in a lateral direction to the teeth  588  in the front rail  580  (i.e., the direction shown by arrow “A” in  FIG. 65 ). Through the use of this resilient tab  564 , products contained on the merchandise system  10  can be replanogrammed. When the divider  550  is moved in a lateral direction, the divider need not be rotated. Instead, the divider  550  remains in a plane parallel to the planar surface  582  of the front rail  580 . In addition, the divider  550  need not be lifted. The divider  550  can simply be moved in the direction noted by arrow “A” in  FIG. 65 . 
     In an example, a merchandise display system includes a front rail  580  and at least one divider  550  configured to engage the front rail  580 . The at least one divider  550  includes a barrier  556  and the at least one divider  550  further includes a divider wall  552 . The at least one divider also includes a divider floor  554  perpendicular to the divider wall  552 , wherein the divider floor  554  is configured to hold product. The merchandise display system also includes a cam  720  coupled to the divider  550 , wherein the cam  720  is configured to move between a first position and a second position. The at least one divider  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when the at least one divider  550  is engaged with the front rail  580  and the cam  720  is in the first position. The at least one divider  550  is (a) fixed in the lateral direction parallel to the front rail  580  and (b) secured in the direction perpendicular to the front rail  580  when the at least one divider  550  is engaged with the front rail  580  and the cam  720  is in the second position. 
     In an example the cam  720  includes a handle to rotate the cam  720  between the first position and the second position. In another example, the cam  720  can include a handle that allows the cam  720  to slide between a first position and a second position (not shown). The cam  720  also can include one or more cam walls configured to engage one or more groove walls in the front rail  580  when the cam  720  is in the second position. The cam  720  also can include a plurality of cam teeth configured to engage a plurality of front rail teeth on a surface of the front rail  580  when the cam  720  is in the second position. The front rail teeth can be on an inner surface of the front rail  580 . The merchandise display system also can include a pusher mechanism having a pusher surface, a pusher floor extending forwardly from the pusher surface, and a coiled spring having a coiled end and a free end. The coiled end of the spring can be positioned behind the pusher surface and the pusher mechanism can be attached to the merchandise display system only by the coiled spring. The barrier can be configured to receive the free end of the coiled spring. The front rail can define a front rail groove and the divider can define a divider ridge configured to engage the front rail groove. 
     In an example, a merchandise display system includes a front rail  580  and a plurality of dividers  550  configured to attach to the front rail  580  and separate product into rows. Each of the plurality of dividers  550  includes a divider wall  552  extending in a direction perpendicular to the front rail  580 , a divider floor  554  perpendicular to the divider wall  552 , wherein the divider floor  554  is configured to hold product, and a cam  720  coupled to the divider  550 , wherein the cam  720  is configured to move between a first position and a second position. Each of the plurality of dividers  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when each of the plurality of dividers  550  is engaged with the front rail  580  and the cam  720  for each of the plurality of dividers  550  is in the first position. In addition, each of the plurality of dividers  550  is (a) fixed in the lateral direction parallel to the front rail  580  and (b) secured in the direction perpendicular to the front rail  580  when each of the plurality of dividers  550  is engaged with the front rail  580  and the cam  720  for each of the plurality of dividers  550  is in the second position. 
     In an example, each of the plurality of dividers  550  is configured to move in the lateral direction parallel to the front rail  580  when product is positioned on the divider floor  554 . A force on an outermost divider of the plurality of dividers  550  can cause each of the plurality of dividers  550  to move in the lateral direction parallel to the front rail  580  when the cams  720  for each of the plurality of dividers  550  is in the first position, and wherein the force is in a direction parallel to the front rail  580  and perpendicular to the divider wall  552  of the outermost divider. 
     In an example, a merchandise display system includes a front rail  580  and at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  including a barrier, a divider wall  552  extending in a direction perpendicular to the front rail, a divider floor  554  perpendicular to the divider wall  552 , wherein the divider wall  552  separates the divider floor  554  into a first portion and a second portion and each of the first portion and the second portion are configured to hold product. The merchandise display system also includes a first pusher mechanism configured to slide along at least part of the first portion, a second pusher mechanism configured to slide along at least part of the second portion, and a cam  720  coupled to the at least one divider  550 , the cam  720  configured to move between a first position and a second position. The at least one divider  550  is movable in a lateral direction parallel to and along the front rail  580  when the cam  720  is in the first position, and the at least one divider  550  resists movement in the lateral direction parallel to and along the front rail  580  when the cam is in the second position. 
     In an example, each of the first and second pusher mechanisms of the merchandise display system include a pusher surface, a pusher floor extending forwardly from the pusher surface, and a coiled spring having a coiled end and a free end, wherein the coiled end is positioned behind the pusher surface. The first and second pusher mechanisms are attached to the merchandise display system only by the coiled spring. The at least one divider can define a divider engaging member and the at least one front rail can define a front rail engaging member, and the divider engaging member can be configured to engage the front rail engaging member. The divider engaging member can define divider teeth on at least one surface of the divider engaging member and the front rail engaging member can define front rail teeth on at least one surface of the front rail engaging member. The divider teeth can be configured to engage the front rail teeth. 
     In an example, a merchandise display system includes a front rail  580  and at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  including a barrier configured to engage the front rail  580 , a divider wall  552  extending in a direction perpendicular to front rail  580 , a divider floor  554  perpendicular to the divider wall  552 , wherein the divider floor  554  is configured to hold product. The display system also can include a resilient tab coupled to the divider  550 , the resilient tab configured to move between a first position and a second position. The at least one divider  550  is fixed in a lateral direction parallel to the front rail  580  when the resilient tab is in the first position. The at least one divider  550  is movable in the lateral direction parallel to the front rail  580  when the resilient tab is in the second position. 
     In an example, the divider  550  includes a plurality of teeth configured to engage the front rail  580 . The divider teeth can be configured to engage corresponding teeth on the front rail  580 . The divider teeth of the merchandise display system can be configured to engage a resilient surface on the front rail  580 . 
     In an example, a merchandise display system includes a front rail  580 , the front rail  580  comprising at least one first projection and at least one first recess, and at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  comprising a divider wall  552  and a divider floor  554  perpendicular to the divider wall  552 , the at least one divider  550  further comprising at least one second recess and at least one second projection, the at least one second projection of the divider  550  configured to move between a first position and a second position, The at least one divider  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when the at least one first projection of the front rail  580  is engaged with the at least one second recess of the divider  550  and the at least one second projection of the divider  550  is in the first position. The at least one divider  550  (a) resists movement in the lateral direction parallel to the front rail  580  and (b) is secured in a direction perpendicular to the front rail  580  when the at least one first projection of the front rail is engaged with the at least one second recess of the divider  550  and the at least one second projection of the divider  550  is in the second position. 
     In an example, the at least one second projection of the divider  550  can comprise a cam  720 . The at least one first recess of the front rail  580  can comprise a groove. The at least one second projection of the divider  550  can include a resilient tab. The at least one first projection of the front rail  580  can comprise a tongue. The at least one first projection of the front rail  580  can comprise a plurality of teeth. The at least one second projection of the divider  550  can comprise a tongue. The at least one second projection of the divider  550  can include a plurality of teeth. The merchandise display system also can include a plurality of teeth on the at least one first projection of the front rail  580  and a plurality of teeth on the at least one second recess of the divider  550 . 
     In an example, a merchandise display system includes a front rail  580 , the front rail  580  including at least one first projection and at least one second projection, the at least one second projection of the front rail  580  configured to move between a first position and a second position. The merchandise display system also includes at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  comprising a divider wall  552  and a divider floor  554  perpendicular to the divider wall  552 , the at least one divider  550  further comprising at least one recess. The at least one divider  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when the at least one first projection of the front rail  580  is engaged with the at least one recess of the divider  550  and the at least one second projection of the front rail  580  is in the first position. The at least one divider  550  is (a) fixed in the lateral direction parallel to the front rail  580  and (b) secured in the direction perpendicular to the front rail  580  when the at least one first projection of the front rail  580  is engaged with the at least one recess of the divider  550  and the at least one second projection of the front rail  580  is in the second position. 
     In an example, the at least one first projection of the front rail  580  can comprise a tongue and the at least one recess of the divider  550  can comprise a groove. 
     In an example, a merchandise display system includes a front rail  580 , the front rail  580  comprising a first projection and a second projection. The merchandise display system also includes at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  comprising a divider wall  552  and a divider floor  554  perpendicular to the divider wall  552 , the at least one divider  550  further comprising a recess and a third projection. The at least one of the second projection or the third projection is a movable projection that is movable between a first position and a second position. The at least one divider  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when the first projection of the front rail  580  is engaged with the recess of the divider  550  and the movable projection is in the first position. The at least one divider  550  is (a) fixed in the lateral direction parallel to the front rail  580  and (b) secured in the direction perpendicular to the front rail  580  when the first projection of the front rail  580  is engaged with the recess of the divider  550  and the movable projection is in the second position. 
     In an example, the movable projection of the merchandise display system can be a cam  720  or a resilient tab. The first projection of the front rail  580  can be a tongue and the recess of the divider  550  can be a groove. 
     In an example, a merchandise display system includes a front rail  580 , the front rail  580  comprising at least a first engaging member. The merchandise display system also includes at least one divider  550  configured to attach to the front rail  580 , the at least one divider  550  comprising a divider wall  552  and a divider floor  554  perpendicular to the divider wall, the at least one divider  550  further comprising at least a second engaging member. The merchandise display system also includes a third engaging member configured to move between a first position and a second position. The at least one divider  550  is (a) movable in a lateral direction parallel to the front rail  580  and (b) secured in a direction perpendicular to the front rail  580  when the first engaging member of the front rail  580  is engaged with the second engaging member of the divider  550  and the third engaging member is in the first position. The at least one divider  550  is (a) fixed in the lateral direction parallel to the front rail and (b) secured in the direction perpendicular to the front rail  580  when the first engaging member of the front rail  580  is engaged with the second engaging member of the divider  550  and the third engaging member is in the second position. In an example, when the first engaging member of the front rail  580  is engaged with the second engaging member of the divider  550  and the third engaging member is in the first position, the at least one divider  550  is movable in the plane of a shelf (such as shelf  596  shown in  FIGS. 70 and 71 ) only in the lateral direction parallel to the front rail  580 ; the at least one divider  550  is fixed in the plane of the shelf in all directions other than the direction parallel to the front rail  580 ; the at least one divider  550  may not twist, splay of fish tail in the plane of the shelf; the at least one divider  550  remains perpendicular to the front rail  580 . 
     In an example, the third engaging member can be a portion of the front rail  580  or a portion of the divider  550 . In an example, the third engaging member can comprise a cam  720  or an engaging surface. In an example, the first engaging member of the front rail  580  is a projection. The merchandise display system also can include a pusher mechanism  520  having a pusher surface  528 , a pusher floor  524  extending forwardly from the pusher surface  528 , and a coiled spring  534  having a coiled end and a free end. The coiled end can be positioned behind the pusher surface  528  and the pusher mechanism  520  is attached to the merchandise display system only by the coiled spring  534 . The merchandise display system also can include a barrier that is configured to receive the free end of the coiled spring  534 . 
     In an example, a merchandise display system includes a front rail  580  and at least one divider  550  configured to engage the front rail  580 , the at least one divider  550  including a barrier  556 , the at least one divider further including a divider wall  554 , the at least one divider further including a divider floor  552  perpendicular to the divider wall  554 , wherein the divider floor  552  is configured to hold product. The merchandise display system also includes a cam  720  coupled to the divider  550 , wherein the cam  720  is configured to move between a first position and a second position. The at least one divider  550  can be secured in a direction perpendicular to the front rail  580  when the at least one divider  550  is engaged with the front rail  580 . The cam  720  can inhibit movement of the at least one divider  550  in the lateral direction parallel to the front rail  580  when the cam  720  is in the first position. The cam  720  can allow movement of the divider  550  in the lateral direction parallel to the front rail  580  when the cam  720  is in the second position. The merchandise display system can include a handle to rotate the cam  720  between the first position and the second position. The merchandise display system can include a handle to slide the cam  720  between the first position and the second position (not shown). 
       FIGS. 67A-C  show an example of a step by step approach to placement of a divider into a front rail. To begin, as illustrated in  FIG. 67A , the divider  550  is lowered into the channel  586  defined by the front rail  580 . The force of lowering the divider  550  into the channel  586  causes the teeth  562  on the divider  550  to contact the top of the front rail  580  and move in a direction toward the divider  550  and away from the front rail  580 , as illustrated in  FIG. 67B . The teeth  562  on the divider  550  may be ramped teeth as shown in  FIG. 63 . The front rail  580  includes recesses  589 , as illustrated in  FIG. 64 , that are shaped to engage the teeth  562  on the divider  550 . These recesses  589  are spaced by the teeth  588  present on the front rail  580 . When the divider  550  is lowered further into the channel  586  on the front rail  580 , as illustrated in  FIG. 67C , the teeth  564  of the divider  550  move past the top of the front rail  580  and move into the recesses  589  in the front rail  580 . When the teeth  564  on the divider  550  are in the recesses  589  in the front rail  580 , the divider  550  is in an engaged position and will not move in a lateral direction under a normal amount of force. 
     In an example,  FIGS. 68A-C  show a step by step approach to placement of a divider in a front rail in another embodiment. In the initial step, as illustrated in  FIG. 68A , the resilient tongue or tab  564  is manually pushed backward causing the teeth  562  on the tab  564  to move backward toward the divider  550 . An axle style pivot allows for the resilient tongue or tab  564  to remain in the pushed back position and allows the teeth  562  to remain in the position toward the divider  550 . The divider  550  is then placed in contact with the front rail  580 , as illustrated in  FIG. 68B . The groove  560  of the divider  550  engages the ridge or tongue  584  of the front rail  580 . At this point the divider  550  can be moved in a lateral direction along the front rail and can allow for ease of replanogramming. However, the divider  550  is secured in a direction perpendicular to the front rail  580  (i.e., parallel to the divider  550 ) and cannot be moved in this direction, other than for an insignificantly small amount of play between the grove  560  of the divider  550  and the ridge or tongue  584  of front rail  580 . (The direction perpendicular to the front rail is noted by arrow “B” in  FIG. 86H .) This insignificantly small amount of play may not be noticeable to a user of the system. While the divider  550  is in contact with the front rail  580  and the groove  560  of the divider  550  engages the ridge or tongue  584  of the front rail  580 , as illustrated in  FIG. 68B , the divider  550  can move in the plane of the shelf (the shelf is noted as  596  in  FIGS. 70 and 71 ) only in the lateral direction parallel to the front rail  580  (i.e., the direction noted by arrow “A” in  FIG. 65 ). The divider is fixed and immovable in the plane of the shelf under normal operating forces in all other directions other than the direction parallel to the front rail  580 . The divider cannot twist, splay, fish tail or otherwise move in the plane of the shelf in a direction other than the direction parallel to the front rail  580 . The divider  550  may, however, be able to move in a direction out of the plane of the shelf, such as the direction noted by arrow “C” in  FIG. 87B . The divider  550 , with or without product on the divider floor  554 , can be slid in the direction previously noted by arrow “A” in  FIG. 65 , without requiring that the divider  550  be lifted up. In the final step, as illustrated in  FIG. 68C , the resilient tongue or tab  564  is manually pulled forward away from the divider  550 . This movement causes the teeth  562  on the front divider  550  to fit within recesses  589  in the front rail  580 . The recesses  589  in the front rail  580  are spaced by teeth  588  in the front rail. When the teeth  562  of the divider  550  are in contact with the recesses  589  and teeth  588  in the front rail  580 , the divider  550  is engaged and cannot move in a lateral direction under a normal amount of force. 
     In another example, the resilient tongue or tab does not include an axle style pivot that allows for the resilient tongue or tab  564  to remain in the pushed back position. Instead, the resilient tongue or tab  564  is biased toward the front rail  580  and away from the divider  550  such that the tongue or tab  564  automatically returns to its resting position and may engage the front rail  580  when the force manually pushing the resilient tongue or tab  564  backward is removed. 
     In an example, a divider  550  is placed in contact with a front rail  580 . An engaging member of the front rail  580  engages with an engaging member of the divider  550 , which secures the divider in a direction perpendicular to the front rail  580  (the direction noted by arrow “B” in  FIG. 86H ) and renders the divider  550  immovable in a direction perpendicular to the front rail  580 , other than for an insignificantly small amount of play or space between the engaging members that may not be noticeable to a user. The divider  550  also is secured in the plane of the shelf in all directions other than the direction parallel to the front rail  580  (the direction noted by arrow “A” in  FIG. 65 ). The divider  550  can move in the plane of the shelf only in the direction parallel to the front rail  580 . The divider  550  is fixed, under normal operating forces and conditions, in the plane of the shelf in a direction other than the direction parallel to the front rail  580 . The divider, however, may be movable in a direction out of the plane of the shelf, such as a direction noted by arrow “C” in  FIG. 87B . When the divider is “secured” in a direction perpendicular to the front rail  580 , this means that the divider  550  is immovable, under normal operating forces and conditions, in a direction perpendicular to the front rail  580 , other than for an insignificantly small amount of play or space between the engaging members that may not be noticeable to a user. The direction perpendicular to the front rail is noted by arrow “B” in  FIG. 86H . A second engaging member of the front rail  580  or the divider  550  is in a first position and the divider is moved laterally, parallel to the front rail. The second engaging member is then moved to a second position, which makes the divider  550  fixed in a lateral direction parallel to the front rail  580  (the direction noted by arrow “A” in  FIG. 65 ) under normal operating conditions and forces. When the divider  550  is “fixed” in a lateral direction parallel to the front rail  580 , the divider  550  will not move in the lateral direction parallel to the front rail  580  under normal operating conditions and forces. 
     In an example, a plurality of dividers  550  can be moved as a group parallel to the front rail  580  while remaining secured to the front rail  580  in a direction perpendicular to the front rail (the direction noted by arrow “B” in  FIG. 86H ). Each of a plurality of dividers  550  can be placed in contact with a front rail  580 . An engaging member or a plurality of engaging members of the front rail  580  engage(s) with an engaging member on each of the plurality of dividers  550 , which secures each of the plurality of dividers  550  in a direction perpendicular to the front rail  580  (the direction noted by arrow “B” in  FIG. 86H ) and renders each of the plurality of dividers  550  immovable in a direction perpendicular to the front rail  580 , other than for an insignificantly small amount of play or space between the engaging members that may not be noticeable to a user. A second engaging member (or a plurality of second engaging members) of the front rail  580  or each of the dividers  550  is in a first position, which allows the plurality of dividers  550  to be moved laterally, parallel to the front rail  580 . The plurality of dividers  550  can form rows between the dividers  550  that are configured for holding product. Product can be placed between two of the plurality of dividers  550  as shown in  FIGS. 45-47 . A force can be applied to a first divider in the direction parallel to the front rail  580 . This force can move the first divider in the direction parallel to the front rail  580  and cause the divider  550  to contact a product adjacent the first divider  550 . (Product is shown in  FIGS. 45-47  as cans or cartons and can take other shapes.) The divider  550  then can force the product to move in the same direction as the first divider  550 , i.e., parallel to the front rail  580 . The force can move the product to come in contact with a second divider  550  adjacent the product. The product can then force the second divider  550  to move in in the same direction as the first divider  550  and the product, i.e., parallel to the front rail  580 . The second divider can then force a second product adjacent the second divider  550  to move in a direction parallel to the front rail  580 . The second product can force a third divider  550  adjacent the second product to move in a direction parallel to the front rail  580 . In this manner, a series of dividers  550  and products all can be moved in a direction parallel to the front rail  580  with a single force acting on only one of the dividers  550  or products in a direction parallel to the front  580 . When the second engaging member or members on the front rail  580  or one of the plurality of dividers  550  is moved to a second position, which makes the divider  550  fixed in a lateral direction parallel to the front rail  580  under normal operating conditions and forces, the divider  550  cannot move in the direction parallel to the front rail  580  and the divider  550  will not force other dividers  550  or products to move in a direction parallel to the front rail  580 . 
     In an example, when the second engaging member is moved to a second position, the second engaging member inhibits movement of the divider  550  in a lateral direction parallel to the front rail  580 . Under a force equal to or less than a predefined amount of force, the second engaging member prevents the divider  550  from moving in a lateral direction parallel to the front rail  580 . When an amount of force above the predefined amount of force is applied to the divider  550  in the lateral direction parallel to the front rail  580 , the divider  550  can move in the lateral direction parallel to the front rail  580 . 
     In an embodiment as illustrated in  FIG. 66 , the thickness of the divider floor  554  varies. The thickness of a front portion of the divider floor  554  where it is adjacent the planar surface  582  of the front rail is less than the thickness of a rear portion of the divider floor  554  further back, where it is not adjacent the planar surface  582  of the front rail. As shown in  FIG. 67 , the portion of divider floor  554 A is thinner than the portion of divider floor  554 B. In an example, the thickness of the front portion of the divider floor adjacent the planar surface  582  of a front rail  580  is at least 25% less than the thickness of a rear portion of the divider floor  554  that is non-adjacent the planar surface  582  of the front rail  580 . 
     An embodiment, as illustrated in  FIGS. 69A and 69B , includes rail mounting clips  590  for the front rail  580 . As illustrated in  FIG. 69B , the front rail  580  includes an aperture  592 . This aperture  592  can be coordinated to be placed over apertures  595  on a shelf  596  in a retail environment as shown in  FIG. 70 . The rail mounting clips  590  can be curved. The rail mounting clips  590  also contain a narrow portion  594  at one end of the rail mounting clips  590 . The rail mounting clips  590  can be inserted into the wider, round portion of the aperture  592  in the front rail  580  and into apertures  595  on the shelf  596  in the retail environment as shown in  FIG. 71 . The rail mounting clips  590  can then be shifted laterally to a narrower portion within the aperture  592  in the front rail  580 . By shifting the rail mounting clips  590 , the wider round portion of the rail mounting clips  590  will engage the narrower portion of the aperture  592  in the front rail and will be locked into place. The rail mounting clips  590  thereby hold the front rail  580  in place and prevent the front rail  580  from movement in the lateral direction. If it is known prior to shipping that a store shelf will have holes, the rail mounting clips  590  can be inserted and locked into the front rail  580  in advance of shipping. Inserting the rail mounting clips  590  in advance of shipping can add to ease of installation of the merchandise system in the store environment. 
     In at least one embodiment, the height of the divider wall  552  may be greater than the height of the barrier  556 , as shown in  FIGS. 72 and 73 .  FIG. 74  further displays the end  557  of the coiled spring  534  maintained within the barrier  556 . The end  557  of the spring  534  is bent at an angle of approximately 90 degrees to the remainder of the spring body  534 . The end  557  is placed within a slot  558  maintained within the barrier  556 . 
     In an embodiment, the divider  550  contains teeth  600 , as illustrated in  FIGS. 72 and 73 . These teeth can be molded to be integral with the divider  550 . The teeth  600  are not maintained on a resilient tab or tongue as in other embodiments. The teeth  600  are spaced apart from each other. A plurality of teeth  600  can be placed on the divider  550  at the bottom of a front portion of the divider  550  and in front of the barrier  556 . 
     As illustrated in  FIG. 75 , a front rail  610  can include a plurality of teeth  612 . The teeth  612  in the front rail  610  can be designed to releasably engage the teeth  600  of the divider  550  through use of a cam bar  622  in the front rail  610  and camming action, as illustrated in  FIG. 76 . The front rail  610  also includes a planar surface  614  that is substantially flat or planar and a tongue or ridge  616  that is substantially perpendicular to the planar surface  614 , as illustrated in  FIG. 75 . The front rail  610  further includes a cam bar lever  618  that moves the cam bar  622  within the front rail  610 , as shown in  FIGS. 76A and 76B . In  FIG. 76A , the cam bar lever  618  is in a first position in which the teeth  612  of the front rail  610  are withdrawn into the front rail  610  away from the divider. In  FIG. 76B , the cam bar lever  618  is in a second position in which the teeth  612  of the front rail  610  are extended toward the divider  550 . 
       FIG. 77  shows an exploded view of several aspects of an embodiment. Front rail  610  is shown to include an extruded shell  620 , a cam bar  622  and a tooth bar  624 . The tooth bar  624  contains a plurality of teeth  612 . The extruded shell  620  includes a cam area  626  designed to house the cam bar  622  and the tooth bar  624 . The cam bar  622  is located on the base of the front rail  610  adjacent to the extruded shell  620 . The cam bar  624  is in contact with the cam bar lever  618 . The cam bar lever  618  can operate to move the cam bar  622  back and forth in a lateral direction. The cam bar  622  further includes elongated cam reservoirs  628 . The cam reservoirs  628  are diagonal with a front end of the cam reservoir  628  closer to the front end of the front rail  610  and a rear end of the reservoir  628  further back from the front end of the front rail  610 . 
     The tooth bar  624  may include cam studs  630 . The tooth bar cam studs  630  are placed within the cam bar reservoirs  628  during operation of the front rail  610 . When the cam bar  622  and the cam bar reservoirs  628  move laterally, the tooth bar cam studs  630  move in a perpendicular direction to the movement of the cam bar  622 . The tooth bar cam studs  630  move toward the front of the front rail  610  (and away from the teeth  600  of the divider) and away from the front of the front rail  610  (and toward the teeth  600  of the divider) as the cam bar  622  moves laterally back and forth within the cam area  626 . As the tooth bar cam studs  630  move, the tooth bar  624  also moves. Thus, when the cam bar lever  618  is moved from a first position to a second position, it moves the cam bar  622  laterally along the inside of the front rail  610 . This lateral movement of the cam bar  622  causes the tooth bar  624  and the teeth  612  thereon to move in a direction perpendicular to the direction of the cam bar  622 ; that is, the tooth bar  624  moves in a direction toward or away from the front of the front rail  610  and toward or away from the teeth  600  on the divider  550 .  FIG. 78  shows a rear exploded view of several aspects of the embodiment shown in  FIG. 77   
       FIGS. 79A-C  show an example of a step by step guide to placement of the divider  550  into the front rail  610 . The divider  550  including teeth  600  on the divider is lowered into the channel  640  of the front rail  610 , as illustrated in  FIG. 79A . The tooth bar  624  initially is in a position closer to the front of the front rail  610  and the teeth  612  of the tooth bar  624  are not engaged with the teeth  600  of the divider  550 . The cam bar lever  618  is in a first position which maintains the teeth  612  of the tooth bar  624  out of engagement with the divider teeth  600 , as illustrated in  FIG. 79B . In this position, the divider  550  can be moved laterally along the ridge or tongue  616  of the front rail  610 . The divider  550  can have product sit on the divider floor  554  as the divider  550  is moved laterally along the front rail in the direction shown in  FIG. 77  by arrow “A”. The ridge  584  or other projection in the front rail  580  can engage the groove  560  or other recess in the divider  550  to secure the divider  550  and prevent the divider from movement in a direction perpendicular to the front rail  580 , other than for an insignificantly small amount of play (e.g., less than 3 mm) between the ridge  584  and the groove  560 , under normal operating conditions and forces. The cam bar lever  618  is then moved from a first position to second position. The movement of the cam bar lever  618  causes the cam bar  622  to move in a lateral direction within the extruded shell  620 . The movement of the cam bar  622  includes movement of the diagonal cam bar reservoirs  628  in the lateral direction. Movement of the cam bar reservoirs  628  in turn causes the tooth bar cam studs  630  to move in a direction perpendicular to the direction of the cam bar  622  and in a direction toward the teeth  600  of the divider  550 , as illustrated in  FIG. 79C . The tooth bar cam studs  630  are coupled to and may be integral with the tooth bar  624 . Accordingly, movement of the tooth bar cam studs  630  causes the tooth bar  624  and the teeth  612  contained therein to move toward the teeth  600  of the divider. This movement causes the teeth  612  of the tooth bar  624  to become engaged with the teeth  600  of the divider. When the teeth  612  of the tooth bar are engaged with the teeth  600  of the divider, the divider  550  is releasably engaged and will not move in a lateral direction shown by arrow “A” in  FIG. 77  under normal operating forces and conditions. 
     The tooth bar  624  is fixed on its ends such that the tooth bar  624  can only move in a direction that is toward or away from the teeth  600  of the divider. The tooth bar  624  cannot move in a lateral direction shown in  FIG. 77  by arrow “A”. The cam bar  622  operates in the opposite manner. The cam bar  622  is fixed such that the cam bar  622  can only move in a lateral direction shown in  FIG. 77  by arrow “A”. The cam bar cannot move toward or away from the teeth  600  on the divider 
       FIG. 80  provides an isometric view of aspects of an embodiment. When the teeth  612  of the tooth bar  624  are engaged with the teeth  600  of the divider, the entire merchandise system  10  is locked. The front rail  610  and the divider  550  are releasably engaged with each other and will not move relative to each other. In addition, the pusher  520  is engaged with the divider  550 . In this position, the entire merchandise system  10  can be moved. The merchandise system  10  can be set up in a remote location according to a particular planogram and then locked. The merchandise system  10  can then be shipped to the store location. At the store location the merchandise system  10  can be removed from the shipping container and placed on the shelf like a mat. The planogramming of the dividers  550  will remain intact while the merchandise system  10  is locked. 
     In an example, a display system is assembled in a remote location away from a shelf and then moved as a unit to the shelf and secured to the shelf. A plurality of dividers  550  are engaged with a front rail  580  in a manner in which they are secured and will not significantly move in a direction perpendicular to the front rail  580 . The plurality of dividers  550  are adjusted laterally parallel to the front rail  580  according to a pre-panned planogram or other arrangement. The plurality of dividers  550  include engaging members and the front rail  580  includes engaging members. The engaging members on the plurality of dividers  550  and/or the engaging members on the front rail  580  are adjusted from a first position to second position to fix the plurality of dividers  550  to the front rail  580  such that the plurality of dividers cannot move in any direction in relation to the front rail  580 . The front rail  580  and the plurality of dividers  550  are then moved as a unit to the shelf. The front rail  580  then is secured to the shelf. 
     To alter the planogramming of the merchandise system at the store location, the dividers  550  and the product need not be removed from the shelf. The cam bar lever  618  or other engaging member for each of the dividers  550  can be moved to its initial position. By moving the cam bar lever  618  or other engaging member to its initial position, the teeth  612  of the tooth bar  624  release from the teeth  600  of the divider (or one engaging member disengages from another engaging member). In this position, the dividers  550  can be moved laterally in the direction denoted by arrow “A” in  FIG. 80 . Product can remain in place on the divider floors  554  and the pusher floors  524  while the dividers  550  are being moved. Once the dividers  550  have been moved to the new planogram position, the cam bar lever  618  or other engaging member for each of the dividers  550  can be moved to its second position. The teeth  612  of the tooth bar  622  will then engage the teeth  600  of the divider  550  (or one engaging member will engage with another engaging member) and again cause the merchandise system  10  to become locked. 
     In an example, operation of the camming action is further shown in  FIGS. 81A and 81B .  FIG. 81A  shows the teeth  600  of the divider not engaged with the teeth  612  of the tooth bar  624 . In the embodiment, the cam bar  622  is adjacent the front wall of the front rail  610 . In  FIG. 81B , the cam bar lever  618  has been moved to the second position, the cam bar  622  has moved laterally and the tooth bar cam studs  630  have moved toward the divider  550 . The teeth  612  of the tooth bar  624  also have moved toward the divider  550  and have engaged the divider teeth  600 . 
     In an embodiment, a soft rubber pad can be utilized in place of the teeth  612  on tooth bar  624  and can function as an engaging member. In this embodiment, when the tooth bar  624  is adjacent the front portion of the front rail  610 , the soft rubber pad and the divider teeth  600  are not in contact with each other. When the cam bar lever  618  is moved to its second position and the cam bar  622  moves the tooth bar  624  in the direction of the divider teeth  600 , the divider teeth  600  come into contact with and thereby engage the soft rubber pad. This contact provides resistive interference and maintains the divider teeth  600  in place and prevents the divider  550  from lateral movement in the direct noted in  FIG. 77  by arrow “A”. 
     In another embodiment, as shown in  FIGS. 82A-C , the divider  550  is held in place in contact with the front rail  580  through use of a clamp.  FIG. 82A-C  show a step by step process for insertion of the divider  550  into the front rail  580 . Initially, as illustrated in  FIG. 82A , the divider  550  is lowered into a channel  640  formed in the front rail  580  (or  610 ). In addition, a ridge or tongue  644  in the front rail  580  contacts a channel  645  in the divider  550 . The divider  550  includes a bump or outwardly extending ridge  650  at a front portion of the divider  550 . A clamp  652  on the front rail  580  is rotated to engage the bump  650  of the divider  550 . The clamp  652  snaps over the bump  650  and locks the bump  650  and the divider  550  into place. Once releasably engaged, the divider  550  cannot move in the lateral direction noted in  FIG. 80  by arrow “A”. To move the divider  550 , the clamp  652  must be pulled to unsnap the clamp  652  from the divider bump  650 . 
     In another embodiment, as shown in  FIGS. 83A-C , the divider  550  is held in place in contact with the front rail  580  through use of a rotating rod  660  that includes teeth.  FIGS. 83A-C  show a step by step process for insertion of the divider  550  into the front rail  580 . Initially, as illustrated in  FIG. 83A , the divider  550  is lowered into a channel  640  formed in the front rail  580 . The front rail  580  includes a rotating rod  660  which itself includes teeth. When the divider  550  initially is lowered into the channel, as illustrated in  FIG. 83B , the teeth of the rotating rod  660  are in a first position in which they are not engaged with the teeth  600  of the divider  550 . A handle  662  is coupled to the rotating rod  660 . When the handle is in a first position  664 , the teeth of the rotating rod  660  are in a first position in which they are not engaged with the teeth  600  of the divider  500 . When the handle  662  is moved to a second position  668 , as illustrated in  FIG. 83C , the handle  662  rotates the rotating rod  660  and moves the teeth on the rotating rod  662  into a position in which they engage the teeth  600  on the divider  550 . In this position, the rod teeth are in an interfering condition with the divider teeth  600 . When the rod teeth and the divider teeth  600  are engaged with each other the divider  550  cannot move in the lateral direction noted in  FIG. 80  by arrow “A”. To move the divider  550 , the rod  660  must be returned to its first position  664  and the teeth of the rod  660  moved out of engagement with the teeth  600  on the divider  550 . 
     In an embodiment, a plurality of pushers  520  and dividers  550  can be used with a single front rail  580 .  FIGS. 84A-E  show the use of two pushers  520  and two dividers  550  to push product toward the front of the shelf. Use of multiple pushers  520  can allow for pushing of wide product, shown schematically in the figures. In addition, placing the pusher extender  528  in its upwardly extended position can allow the pushers  520  to push taller products or more products as shown in  FIGS. 84  D and  84 E. In an embodiment, a divider  550  can be coupled to two pushers  520 . One pusher  520  can be engaged to a portion of the barrier  556  on each side of the divider wall  552  as shown in  FIG. 84F . In other examples, the divider can be coupled to one pusher or the divider can be coupled to no pusher. 
     In another embodiment, the divider  550  is secured to the front rail  580  in part through the operation of a cam  720 , as illustrated in  FIG. 85 .  FIG. 85  illustrates a cam  720  in a side perspective view coupled to the barrier  556 . The cam  720  includes a rounded portion  722  that is configured to rotate within a cavity  740  (see  FIG. 86G ) in barrier  556 . The cam  720  also includes a tongue  724  that is comprised of a first cam wall  726 , a second cam wall,  728 , and a third cam wall  730 . In  FIG. 85 , the cam is in a position where it is not engaged with the front rail. In this position, the first cam wall  726  can be in a substantially vertical alignment. In this position the second cam wall  728  and the third cam wall  730  may also be in a substantially horizontal alignment. The first cam wall  726  connects with the second cam wall  728 . The second cam wall  728  connects with the third cam wall  730 . The cam also includes a handle  732 . 
     In another embodiment, the tongue  724  only has two cam walls. A first cam wall, such as first cam wall  726 , and a second cam wall. The second cam wall is straight and spans the length shown by cam walls  728  and  730 . There is no bend in the second cam wall in this embodiment. The cam walls can extend for one or more portions of the width of the divider  550  or can extend the entire width of the divider  550 . 
     In another embodiment shown in  FIGS. 92-94 , the cam  720  may define a cam glide surface  733  (hereinafter referred to as the cam glide) located on a bottom side of the cam, opposite of the handle  732 . The cam glide  733  serves as a low friction glide bump to improve the slidability of the divider relative to the rail. In operation, the cam glide  733  lifts the divider up off of the rail to reduce friction between the divider and the rail, thereby improving the slidability of the divider relative to the rail. As seen in the figures, the cam glide  733  of the cam  720  extends below or beneath the bottom surface of the divider and is the contact point between the divider and the rail. In this configuration, when the divider is moved laterally relative to the rail, the primary contact between the divider and the rail is just the cam glide, and no significant other portions of the divider and rail contact each other. This single contact point therefore reduces the friction between the divider and the rail. 
     The cam glide may further define a planar surface extending outwardly from the rounded portion  722  of the cam  720 . The cam glide  733  may be centrally positioned on the rounded portion  722  of the cam to provide stability and balance to the divider relative to the rail. It should be understood, however, that the cam glide may be located at any other suitable location on the cam. The planar surface of the cam glide may terminate at an elongated edge that is sized and shaped to slide freely in the channel  586  of the rail  580  to thereby permit ease of lateral movement of the divider relative to the rail. The elongated edge of the planar surface may define rounded or contoured edge surfaces to further aid in the free movement of the cam glide relative to the rail. It should be understood that the cam glide may define other configurations that permit the cam glide to fit within or along the rail and also permit the slidable movement of the divider relative to the rail. For example, the cam glide may define a bump or rounded protrusion or a series of bumps or rounded protrusions, which would accomplish the same objective as the planar surface defining an elongated edge. While the cam  720  defining a cam glide  733  are depicted being used with a divider, the cam and cam glide may be used with the pusher or pusher assembly or other components that are mounted to the rail. 
     In another embodiment, the cam  720  defining the cam glide  733  may be mounted to the rear of the divider or pusher, and may operatively engage a rear rail that is mounted at the rear of the shelf. In this embodiment, the cam  720  may be used to secure and prevent lateral movement of the divider or pusher relative to the rear rail, if used on the shelf. In other words, the cam and cam glide described herein may be used to secure the divider or pusher to a front rail or a back rail, or both, depending on the desired application. 
     In an exemplary aspect, the cam  720  serves as a lock to lock the divider or pusher to either the front rail or rear rail, or both. The cam  720 , when moved to a locked position, will lock the divider or pusher to the rail and prevent lateral movement of the divider or pusher relative to the rail. In an unlocked position, the cam  720  permits slidable movement of the divider or pusher relative to the rail. In an exemplary aspect, the cam  720  is rotatable or pivotable between the locked and unlocked position. In yet another exemplary aspect, the cam  720  defining the cam glide  733  serves the dual function of locking the divider or pusher to the rail and also enhancing the lateral slidability of the divider or pusher relative to the rail when the cam is in the unlocked position. 
     As shown in  FIG. 92 , the cam  720  may define a rounded portion  722  that is configured to rotate within a cavity  741  in the front of the divider. The cam  720  may also define a cam surface  725  and cam surface  727  that will engage the groove walls  754  and  756  of the front rail, as explained below. 
     In an embodiment, the cam  720  fits within a cavity  740  of the barrier  556 , as illustrated in  FIG. 86G . In an embodiment, the cavity  740  is bounded by side walls  742 . Side walls  742  render the front of the cavity  740  slightly narrower than the width of cam  720 . An amount of force is required to push cam  720  past side walls  742  and into cavity  740 . After the cam passes the side walls  742  it snaps into place in the cavity  740 . The cam  720  can then rotate in cavity  740  and will not fall out of cavity  740  or detach from cavity  740  during normal use. The cam  720  is rotatably secured within cavity  740 . In an embodiment, cavity  740  also is bounded at its front portion by a front wall (not shown). 
     In another embodiment, the side walls  742  do not render the front of cavity  740  narrower than the width of cam  720 . In this embodiment, cam  720  may be placed into cavity  740  and removed from cavity  740  without the need to overcome resistive force caused by side walls  742 . 
     Referring to  FIG. 92 , in another embodiment, the cam  720  defining a cam glide  733  may fit within the cavity  741  formed at the front end of the divider  550  and may be bounded by side walls  743 . Side walls  743  render the front of the cavity  741  slightly narrower than the width of cam  720 . An amount of force is required to push cam  720  past the side walls  743  and into cavity  741 . After the cam passes the side walls  743  it snaps into place in the cavity  741  and seats on a pair of cavity surfaces  747 . The cam  720  can then rotate in the cavity and will not fall out of cavity or detach from the cavity during normal use. 
     As depicted in  FIGS. 92-94 , the cam  720  is rotatably secured within cavity  741 . In this embodiment, the cavity  741  also defines an opening or slot  745  that is sized and shaped to permit rotatable movement of the cam glide  733  within the cavity. The slot  745  is sized and shaped to permit the planar surface of the cam glide  733  to fit therein and to thereby permit the cam to rotate within the cavity  741 . The opening  745  also permits the cam glide  733  to extend past the bottom surface of the divider and into the rail. Once in the rail, the cam glide will lift the divider up and off of the rail and out of contact with the rail, as described above, to permit free slidability of the divider relative to the rail. 
     The opening  745  also creates a clearance for the rotation of the cam glide away from the rail. When the handle  732  on the cam is rotated toward the front edge of the rail, the cam glide will consequently rotate away from the rail. The opening  745  formed within the cavity  741  permits this rotatable movement. 
     Referring to  FIGS. 93A and 93B , the divider  550  is shown being lowered and placed onto the rail  580 . More specifically, front portion of the divider  550  is lower into the channel  586  and the groove  560  is placed over the ridge  584 . The cam glide  733  will contact the channel  586  and support the divider up and off of the rail  580 , as shown in  FIG. 93B . In this embodiment, the cam glide  733  supports the divider and permits free slidable movement of the divider relative to the rail. As shown in  FIG. 93B , there is a gap between groove  560  and ridge  584  and between the underside surface of the divider and the top surface of rail. 
     Referring to  FIGS. 94A-94C , which shows sectional views of the divider, cam and rail, the cam  720  is at all times in contact with the rail  580 . As shown in  FIG. 94A , when the divider  550  is initially lowered onto the rail  580 , the cam glide  733  is in contact with the channel  586  of the rail  580  and lifts the divider up and off of the rail. As shown in  FIG. 94A , the cam  720  defines cam surfaces  725 ,  727  and  729 . The cam further defines a cam handle  732  located opposite the cam glide  733 . Also shown in  FIG. 94A  is the front rail  580  defining a rail channel  586  which receives a portion of the divider  550  and is the contact surface for the cam glide  733 . The rail  580  further defines a rail groove  750  that further defines groove walls  752 ,  754  and  756 , which as explained below, contact the cam surfaces during operation of the cam. 
     Referring to  FIG. 94B , as the cam is rotated, through operation of the handle  732 , the cam glide stays in contact with the channel  586  and the cam surface  725  contacts the groove wall or surface  756  of the front rail. At this point, the cam  720  contacts the rail at two points simultaneously. 
     Referring to  FIG. 94C , as the cam is rotated even further through operation of the handle, the cam surface  725  contacts the groove wall or surface  754  while the cam surface  727  contacts the groove wall or surface  756 . Also, the cam surface  729  will contact the groove wall or surface  752 . The groove wall  752  serves as a stop to prevent further rotational movement of the cam  720 . The handle  732  extends over the top of and even with the front edge of the front rail or past the front edge of the front rail. In an example, front of cam handle  732  is flush with the forward most portion of front rail. Human digital clearance exists between handle  732  and the front rail, sufficient for a human digit (i.e., a finger or thumb) to access the handle. At this point, the cam glide  733  has rotated up and off of the channel  586  of the rail  580  and has rotated into the opening  745 . The divider now sits on and directly contacts the rail, while the cam engages the rail and secures the divider to the rail, preventing lateral movement of the divider. In an exemplary aspect, the cam  720  snaps to the rail with an audible notification heard with standard adult human hearing when in the position depicted in  FIG. 94C , indicating that the cam is locked to the rail. 
     To release the cam from the snapped-in-place or locked position, a user simply lifts upward on the handle  732  to release the cam surfaces  725  and  727  from the groove walls  754  and  756 . As the cam is being released from the groove walls, the cam glide will rotate back into contact with the rail channel  586  and lift the divider up and off of the rail. The divider then will rest on the rail via the cam glide and may then be moved laterally relative to the rail, and the operation described above can be repeated. As indicated above, during the locking and releasing of the cam relative to the rail groove, the cam is at all times in contact with the rail and is at all times in contact with the divider. 
     In an exemplary aspect, the merchandise display system may include a front rail and at least one divider configured to engage the front rail. The divider may include a barrier, a divider wall, and a divider floor perpendicular to the divider wall configured to hold product, as set forth herein. A front lock, such as the exemplary cam  720  described herein, may be coupled to the divider. In an aspect, the front lock is configured to rotate, pivot or move between a first position and a second position. When in the first position, the front lock may permit slidable movement of the divider relative to the front rail. In one embodiment, the lock may lift the divider up off of the front rail. When in the second position, the lock locks the divider to the front rail and prevents slidable movement between the divider and the front rail. The cam is in constant contact with the front rail in both the first position and the second position, and all positions in between the first position and second position. 
     In an example, a lock for the divider, such as cam  720  or other locks, is located at an end of divider. The lock can be located at the front end of the divider (i.e., the end of the divider closest to or in contact with the front rail  580 , which also is the end closest to the consumer selecting product). The lock, such as cam  720 , can be forward of the divider wall  552 . The lock, such as cam  720 , can be forward of barrier  556 . When located at the front end of the divider and in front of the divider wall  552  and in front of barrier  556 , the lock is digitally accessible by an individual providing maintenance to the shelf, restocking the shelf or replanogramming the shelf, even when product is on the divider floor  554  and even when the divider floor  554  is full of product (i.e., no additional product can fit on the divider floor). The lock (such as cam  720 ) can be located on the divider such that the lock is in front of product when product is on the divider floor  554  and product will not interfere with access to the lock in any position of the product when the product is on the divider floor  554 . The cam handle  732  can be flush with the front end of the front rail  580  and can extend beyond the front end of the front rail  580 . 
     In an example, the merchandise display system may include a front rail, at least one divider configured to engage the front rail, and the at least one divider including a barrier. The at least one divider may further include a divider wall, and a divider floor perpendicular to the divider wall where the divider floor is configured to hold product. The merchandise display system also includes a front lock coupled to the front end of the divider. The front lock is in front of the barrier and in front of the divider wall. The front lock is configured to be digitally accessible when product is on the divider floor. The front lock is shiftable between a first position and a second position. The front lock lifts the divider up off of and out of contact with the front rail when in the first position and permits slidable movement of the divider relative to the front rail. The front lock prevents slidable movement of the divider relative to the front rail when in the second position. 
     In an example,  FIGS. 86E and 86F  illustrate magnified portions of cam  720  and front rail  580 . The cam  720  can include texturing. Cam  720  can include teeth or other engaging members. In an embodiment, first cam wall  726  is textured with teeth  736  and  738 . Teeth  736  can form a lower row of teeth. Teeth  738  can form an upper row of teeth. Teeth  736  and teeth  738  in an embodiment are rounded. In at least one embodiment, teeth  736  and teeth  738  form one vertical row of teeth. Eliminating the points on the teeth can provide for better operation and longer-life for the cam teeth. Cam  720  also can be textured in manners other than with teeth, such as through roughening or other texturing. 
     In an example, front rail  580  includes a groove  750 , as illustrated in  FIG. 86F . The groove  750  may include a first groove wall  752 , a second groove wall  754  and a third groove wall  756 . First groove wall  752  is connected to second groove wall  754 , which in turn also is connected to third groove wall  756 . In another embodiment, the groove  750  only has two groove walls. A first groove wall, such as first groove wall  752 , and a second groove wall  754 . The second groove wall  754  is straight and spans the length shown by groove walls  754  and  756 . There is no bend in the second groove wall  754  in this embodiment. 
     In an embodiment, groove  750  can be textured. Groove  750  can include teeth. In an embodiment, first groove wall  752  includes teeth  766  and teeth  768 . Teeth  766  can form a lower row of teeth. Teeth  768  can form an upper row of teeth. In at least one embodiment, teeth  766  and  768  form one vertical row of teeth. Teeth  766  and  768  can be rounded. Teeth  766  and  768  can be placed along an entire length of groove  750 . In addition, teeth  766  and  768  can be placed in sections along groove  750  with additional sections of groove  750  that are smooth and without teeth. Groove  750  also can be textured in manners other than with teeth, such as through roughening or other texturing. In an embodiment, second groove wall  754  is smooth and third groove wall  756  is smooth. In an embodiment, second cam wall  728  is smooth and third cam wall  730  is smooth. 
     In an embodiment, as shown in  FIGS. 87A-C , a merchandise display system  10  comprises a divider  550  and a front rail  580 . The divider  550  comprises a divider wall  556 , a divider floor  554  and a barrier  554 . A cam  720  is rotatably coupled to a front portion of the barrier  556 . The cam  720  includes a cam tongue  724 , wherein the cam tongue  724  comprises a first cam wall  726 , a second cam wall  728  and a third cam wall  730 . The cam  720  also includes a handle  732 . The front rail  580  comprises a groove  750  that is comprised of a first groove wall  752 , a second groove wall  754  and a third groove wall  756 . The cam  720  is configured to rotate between a first position and a second position, wherein when the cam  720  is in the second position, the cam tongue  724  is engaged with the front rail groove  750  and the divider wall  5560  is inhibited from moving in a lateral direction. The cam  720  also can be configured to slide between a first position and a second position. 
       FIGS. 87A-C  show a progression in which divider  550  is coupled to front rail  580 . The cam  720  is moved between a first position in  FIG. 87B  to a second position in  FIG. 87C . As described below, the cam  720  allows for the divider  550  to be moved laterally along the front rail  580  or otherwise parallel to the front rail  580  when the cam  720  is in the first position shown in  FIG. 87B . (In  FIG. 87  B the divider  550  is secured in the direction perpendicular to the front rail  580  and cannot move in the perpendicular direction, other than for an insignificantly small amount of play that may exist between the divider and the front rail, which may not be noticeable to a user of the system.) The cam  720  inhibits the divider  550  from moving laterally along the front rail  580  when the cam  720  is in the second position shown in  FIG. 87C . In an example, under normal operating conditions and forces, the cam  720  will prevent the divider  550  from moving laterally along front rail  580  (and render the divider  550  immovable along the front rail  580 ) when the cam  720  is in the second position shown in  FIG. 87C . In another example, the cam  720  inhibits movement of the divider  550  by preventing the divider  550  from moving laterally along front rail  580  when a force equal to or less than a predefined amount of force is applied to the divider  550  in a lateral direction parallel to the front rail  580 . When an amount of force above the predefined amount of force is applied to the divider  550  in a lateral direction parallel to the front rail  580 , the divider  550  moves in the lateral direction parallel to the front rail  580 . 
       FIG. 87A  shows divider  550  raised above front rail  580 . In  FIG. 87B , divider  550  has been lowered and placed into contact with front rail  580 . Groove  560  has been placed over ridge  584  and ridge  584  has been placed with groove  560 . Groove  560  and ridge  584  may be in contact with each other in this position. Groove  560  and ridge  584  also may not be in contact with each other at all times in this position. Space can exist between the surfaces of groove  560  and ridge  584  in some positions. A front portion of barrier  556  also has been placed within channel or groove  586 . In  FIG. 87B , the tongue  724  of cam  720  is not engaged with the groove  750  of front rail  580 . In  FIG. 87B , the divider  550  can move in a lateral direction shown by arrow “A” in  FIGS. 86F and 86H . Divider  550  need not be raised above front rail  580  to enable such movement. Divider  550  can remain in contact with front rail  580  and move in direction “A.” Product may be placed on the divider floor  554  during the process of moving divider  550 . The ability to move divider  550  without separating divider  550  from front rail  580  or removing product provides for ease of replanogramming. In  FIG. 87B , the divider  550  can move in the plane of the shelf (the shelf is shown as  596  in  FIGS. 70 and 71 ) only in the lateral direction parallel to the front rail  580  shown by arrow “A” in  FIGS. 86F and 86H . In  FIG. 87B , the divider  550  is immovable in all other directions in the plane of the shelf, such as the direction shown by arrow “B” in  FIG. 86H , under normal operating forces and conditions. The divider  550  cannot swing, rotate, splay or fish tail in the plane of the shelf and the divider  550  remains perpendicular to front rail  580  under normal operating forces and conditions. In  FIG. 87B , the divider  550  can move in the direction shown by arrow “C” in  FIG. 87B  and thereby lift away from the front rail  580 . The direction shown by arrow “C” in  FIG. 87B  is not in the plane of the shelf. 
     In  FIG. 87C , cam handle  732  has been rotated toward front rail  580 . In an embodiment, cam handle  732  is in contact with front rail  580 . As the cam  720  is rotated from its position in  FIG. 87B  to its position in  FIG. 87C , cam tongue  724  comes into contact with the front rail  580  and slightly deforms the front rail  580  away from cam tongue  724 . Cam first wall  726  may be in contact with groove third wall  756  as the cam  720  is being rotated from its position in  FIG. 87B  to its position  FIG. 87C . 
     As the cam moves into the position shown in  FIG. 87C , tongue  724  can snap into place within groove  750  and tongue  724  is engaged with groove  750 . In an embodiment, tongue  724  is in perfect fit with groove  750 . This perfect fit involves engagement of the tongue  724  and the groove  750 . Front rail  580  is not deformed and the cam  720  and the front rail  580  are not in tension with each other. First cam wall  726  is adjacent first groove wall  752 . Second cam wall  728  is adjacent second groove wall  754 . Third cam wall  730  is adjacent third groove wall  756 . In an embodiment, the cam walls and the groove walls are in contact with each other. For example, first cam wall  726  is in contact with first groove wall  752 ; second cam wall  728  is in contact with second groove wall  754 ; and third cam wall  730  is in contact with third groove wall  756 . In at least one embodiment, while the cam walls and the groove walls are in contact with each other they are not in substantial tension with each other. In another embodiment, one or more of the cam walls are in tension with one or more of the groove walls when the cam walls and groove walls are in contact with each other. 
     In an embodiment where first cam wall  726  has been placed in contact with first groove wall  752 , the teeth of first cam wall  726  engage the teeth of first grove wall  752 . Teeth  736  engage teeth  766  and teeth  738  engage teeth  768 . The engagement of the teeth of the first cam wall and the teeth of the first groove wall provides resistance to the divider moving laterally along the front rail in the lateral direction shown by arrow “A” (as shown in  FIG. 86H ). 
     When cam tongue  724  has been placed in perfect fit with groove  750 , there is substantial resistance to movement of the divider  550  laterally along the front rail in the lateral direction shown by arrow “A,” (as shown in  FIG. 86H ) and the divider  550  will not move laterally under the normal forces placed on the divider during operation. 
     When it is desired to again move the divider  550  along front rail  580 , the cam can be unsnapped from the front rail. Handle  732  can be rotated away from front rail  580 . Tongue  724  can disengage from groove  750  and return to its position in  FIG. 87B . 
     In an embodiment, the divider wall  552  has sections of different width (see  FIG. 85 ). A front section  770  of the divider wall  552  that can be adjacent barrier  556  can have a greater width than a rear section  772  of divider wall  552  that is adjacent barrier  556 . Front section  770  can be connected to rear section  772  by an intermediate section  774 . The width of intermediate section  774  gradually changes from the width of the divider front section  770  to the width of the divider rear section  772 . In an embodiment, the width of the portion of the intermediate section  774  adjacent section  770  is equal to the width of section  770  and the width of the portion of the intermediate section  774  adjacent section  772  is equal to the width of section  772 . The lesser width of rear section  772  of divider wall  552  creates air space between divider walls  552  and assists in preventing product from binding between two divider walls  552  when being pushed and assists in providing for flow of product along the divider floor  554  as product is removed from the front of the merchandise system  10 . In an example, the width of the front section  770  of the divider wall  552  is at least 25% greater than the width of the rear section  772  of the divider wall  552 . 
     In the embodiments shown in  FIGS. 85-87C  one or more dividers  550  can be placed into contact with front rail  580 . When the cam  720  or other engaging member is not engaged with front rail  580 , the dividers  550  can move parallel to the length of front rail  580  in the lateral direction shown by arrow “A” (see  FIG. 86H ). The divider  550  can then be fixed into place by snapping the cam  720  or other engaging member into engagement with front rail  580 . The divider  550  will remain fixed under normal operating forces until the cam  720  or other engaging member is unsnapped or otherwise placed out of engagement with front rail  580 . 
     In an embodiment, the front wall  561  of groove  560  is textured, as shown in  FIG. 86K . This texturing can be in the form of roughening or small teeth. The texturing causes the surface of the front wall  561  of groove  560  to not be smooth. In an embodiment, front wall  585  of ridge  584  or other protrusion or engaging member is textured, as depicted in  FIGS. 861, 86J, and 86L . This texturing can be in the form of roughening or small teeth and causes the surface of front wall  585  of ridge  584  to not be smooth. 
     In at least one embodiment, as depicted in  FIG. 86I , the barrier  556  is a separate component and may removably attached to the divider  550 . In at least one embodiment, the barrier  556  may snap on to the front of the divider  550 . In at least one embodiment, the barrier  556  is moveable. The entire barrier  556  may be movable, or a portion or portions of the barrier  556  may be moveable. For example, the portion of the barrier  556  positioned in front of product on the merchandise display system  10  may be movable. In at least one embodiment, the portion of the barrier  556  positioned in front of the product may be configured to slide. In an alternative embodiment, the portion of the barrier  556  positioned in front of the product may be configured to rotate around an axis, to allow the portion of the barrier  556  to open and close. In this embodiment, the axis may be a hinged connection. Additionally or alternatively, the portion of the barrier  556  may be spring mounted to the divider  550 , such that the portion of the barrier  556  requires an amount of force to move it away from the divider  550 . In this embodiment, upon release of the force, the portion of the barrier  556  will close or return to its original position. Exemplary methods for mounting the barrier  556  are described in further detail in U.S. Pat. No. 8,056,734, which is incorporated by reference herein in its entirety. 
     In an example, the divider  550  does not include a barrier. Alternatively, one or more barriers may be included in the front rail  580 . 
     In an embodiment, when the divider  550  is placed in contact with the front rail  580 , as shown in  FIG. 87B , front wall  561  of groove  560  is not in contact with or not in consistent contact with front wall  585  of ridge  584  while the cam  720  is in the position shown in  FIG. 87B  and the tongue of cam  720  is not engaged with groove  750  of front rail  580 . When the cam  720  is moved from a first position shown in  FIG. 87B  to a second position shown in  FIG. 97C , and the tongue  724  engages with groove  750 , the tongue can force the divider  550  to move backward. In an embodiment, tension between the tongue  724  and the groove  750  forces divider  550  to move in a rearward direction. When the cam is moved to the second position shown in  FIG. 87C  front wall  561  of groove  560  comes into contact with front wall  585  of ridge  584 . Front wall  561  engages with front wall  585 . The texturing on front wall  561  of groove  560  engages with the texturing on front wall  585  of ridge  584 . The engagement of front wall  561  of groove  560  with front wall  585  of ridge  584  inhibits movement of the divider  550  along front rail  580  in the direction shown by arrow “A” in  FIG. 86H . The engagement of the texturing on front wall  561  of groove  560  with the texturing on front wall  585  of ridge  584  further inhibits movement of the divider  550  along front rail  580  in the direction shown by arrow “A” in  FIG. 86H . 
     In an example, a resilient strip or bead can be included into the top surface of ridge  584 , or other protrusion, of front rail  580 . When cam  720 , or other engaging device, is in a first position, the resilient strip or bead is not compressed. In this first position, the divider  550  can move in a lateral direction parallel to the front rail, but cannot move in a direction perpendicular to the front rail. When cam  720 , or other engaging device, is moved to a second position, the resilient strip or bead comes into compression with groove  560 , or other recess, of divider  550 . When the resilient strip or bead is in compression with groove  560 , or other recess, divider  550  becomes fixed under normal operating forces in a direction parallel to the front rail  580 . In an example, the portion of the groove  560 , or other recess, that comes into contact with the resilient strip or bead of front rail  580  can include a roughening or teeth (not shown). 
     In an embodiment, barrier  556  is not molded at the same time as divider wall  552  and divider floor  554 . Barrier  556  is molded as a separate piece from divider wall  552  and divider floor  556 , as shown in  FIG. 88A . Barrier  556  may be molded of a clear material, whereas divider wall  552  and divider floor  554  may be molded of an opaque material. 
     In an example, a divider  550  includes an engaging member that comprises a planar surface. The front rail  580  can include an engaging member that comprises a planar surface. The planar surface of the engaging member on the divider and/or the engaging member on the front rail can comprise a smooth or substantially smooth surface. The planar surface can include a resilient surface. The planar surface can include a rubber strip or a neoprene strip or material that is otherwise compressible. In an example, when the engaging member of the divider  550  is in a first position it is not engaged with the engaging member of the front rail  580  and the divider  550  is movable laterally parallel to the front rail. When the engaging member of the divider  550  is in a second position it is engaged with the engaging member of the front rail  580  and the divider is fixed and not movable laterally parallel to the front rail under normal operating conditions and forces. In an example where the engaging members of the front rail  580  and the divider  550  are smooth or substantially smooth surfaces and do not include teeth or other protrusions, the divider  550  can have additional lateral adjustability and infinite or near infinite lateral adjustability. The lateral adjustability of the divider  550  is not limited by the physical dimensions, such as width, of projections or teeth. Infinite lateral adjustability provides significant benefits to display systems by efficiently utilizing lateral space and limiting or minimizing unused or lost space between product rows and thereby potentially increasing the amount of usable space and lateral product facings on a shelf. 
     In an embodiment, barrier  556  can be snap fit or otherwise engaged with divider  550 , as shown in  FIG. 88B . The engagement between barrier  556  and divider  550  can be such that barrier  556  cannot be removed from divider  550  under normal operating conditions and without deleteriously affecting the structure of barrier  556  or divider  550 . 
       FIGS. 89A-C  show an example of a step by step approach to placement of a divider in a front rail. In the initial step, as illustrated in  FIG. 89A , the divider  550  may be lowered into contact with the front rail  590 . A rotating “T” lock  900  may be rotated to snap over the front rail  580 . The rotating “T” lock  900  may be attached to a front portion of the divider  550 . The rotating “T” lock  900  may rotate around an axis  903 . The divider  550  may be lowered and placed in contact with the front rail  580 , as illustrated in  FIG. 89B . The groove  560  or other recess of the divider  550  engages the ridge or tongue  584  or other protrusion of the front rail  580 . At this point the divider  550  can be moved in a lateral direction parallel to the front rail and can allow for ease of replanogramming. In an example the divider  550  can move along the front rail. The divider  550 , with or without product on the divider floor  554 , can be slid in the direction previously noted by arrow “A” in  FIG. 65 , without requiring that the divider  550  be lifted up. In the final step, as illustrated in  FIG. 89C , the rotating “T” lock  900  may be pushed forward and downwardly toward the front rail  580 . The rotating “T” lock  900  may engage with a lip  901  on a front portion of the front rail  580 . In at least one embodiment, the front rail  580  includes a top front surface  902 . The top front surface  902  may include a texture or may be a resilient surface, such as rubber. Alternatively, the top front surface  902  may include one or more teeth. The top front surface  902  may engage with a surface  904  on the rotating “T” lock  900 . The surface  904  may also include a texture or may be a resilient surface, such as rubber. Alternatively, the surface  904  may include teeth configured to engage the teeth on the top front surface  902 . When the rotating “T” lock  900  engages lip  901 , the divider  550  is engaged to the front rail  580  and cannot move in a lateral direction under a normal amount of force. 
       FIGS. 90A-F  illustrate embodiments of the divider  550  and front rail  580 . As shown in  FIG. 90A , a divider  550  may include wall  552 , a floor  554  and a barrier  556 . The divider wall  552  may divide the divider floor  554  into two portions,  559  and  551  with one portion on each side of the divider wall  552 . As illustrated in  FIG. 90B , the divider wall  552  may extend perpendicularly from the divider floor  554 . The barrier  556  may be located at the front of the divider wall  552 . As illustrated in  FIGS. 90C and 90F , the bottom surface of the divider floor  554  may include a groove  560  or other recess, a tongue  941  or other protrusion, and a front wall  561 . In at least one embodiment, the front wall  561  of groove  560  is textured. This texturing can be in the form of roughening or small teeth. The texturing may cause the surface of the front wall  561  of groove  560  to not be smooth. 
     As illustrated in  FIG. 90D , a front rail  580  can define a planar surface  582 , a ridge or tongue  584  or other projection, a first channel or groove  586  or other recess, and a second channel or groove  950  or other recess. The front wall  561  of the divider  550  may engage the first groove  586  of the front rail  580 . The ridge or tongue  584  of the front rail  580  may engage the groove  560  of the divider  550 . The tongue  941  of the divider  550  may engage the second groove  950  of the front rail  580 . In an embodiment, front wall  585  of ridge  584  is textured. This texturing can be in the form of roughening or small teeth and causes the surface of front wall  585  of ridge  584  to not be smooth. The texturing of the front wall  585  of the ridge  584  may engage with the texturing of the front wall  561  of groove  560 . The engagement of the front wall  561  of the divider  550  to the first channel  586  of the front rail  580 , the engagement of the ridge or tongue  584  of the front rail  580  to the groove  560  of the divider  550 , and the engagement of the projection  941  of the divider  550  to the second groove  950  of the front rail  580  may keep the divider wall  552  perpendicular to the front rail  580  and prevent a back portion of the divider  550  from splaying. In at least one embodiment, the divider  550  may be moved laterally parallel to and/or along the front rail  580  when the divider  550  receives a lateral force. 
     The front rail  580  may include apertures  951  and openings  952 , as illustrated in  FIG. 90E . The apertures  951  may be configured to engage with corresponding engagement projections (not shown). In an example, the engagement projection can be a flat splicer. The corresponding engagement projections may connect one or more front rails  580  together in series. The connection of the apertures  951  and engagement projections can allow for one or more front rails  580  to be connected in series, even if the front rails  580  are not in perfect alignment with each other. The openings  952  may be configured to receive fasteners, which fasten the front rail  580  to a display shelf. The front rail  580  may include any number of opening  952  suitable for securing the front rail  580  to a display shelf. Any type of fastener may be contemplated within the scope of the invention. 
     In an example, as illustrated in  FIG. 91A , the merchandise display system  10  may include a back rail  810 . The back rail  810  can be located at or near the back of a shelf. The back rail  810  may be a similar construction as the front rail  580  and the disclosure herein regarding the front rail  580  applies equally to the back rail  810 . For example, the back rail  810  may include a recess  804 , which may generally be in the shape of a “u”. In this embodiment, the dividers  550  may be connected to divider blocks  802 . The divider blocks  802  may then engage with the back rail  810 . The back rail  810  can be a second rail in the merchandise display system, along with the front rail  580 . The back rail  810  also can be the only rail in the merchandise display system. As noted above, front rail  580  can be located at the rear of the merchandise display system and thereby function as a back rail  810 . In at least one embodiment, the plurality of divider blocks  802  each has a cam  710  (not shown in  FIG. 91A ) in the location denoted by the arrow in  FIG. 91A . This cam  720  can rotate from a first position to a second position and have the same effect as the cam  720  in the divider that engages with the front rail  580 . The divider blocks  802  also can include other engaging devices, including the engaging devices described herein for the divider  550 , that engage with the back rail  810 . The use of the back rail  810  may keep the back of the dividers  550  in position and prevent product from moving to a position behind the pusher  520 . To unlock the dividers  550  from the back rail  810 , the  720  or other engaging device is rotated away from the back rail  810  or otherwise disengaged with the back rail  810 . 
     In an example, a divider  550  can be placed into contact with a front rail  580 . Groove  560  can be placed over ridge  584  and ridge  584  can be placed within groove  560 . Groove  560  and ridge  584  can be in contact with each other in this position. Divider  550  also can be placed into contact with rear rail  810 . A groove or other recess in the divider  550  can be placed over a ridge or other protrusion of rear rail  810  and the ridge or protrusion of the rear rail  810  can be placed within a groove or other recess of divider  550 . Divider  550  can be in contact with front rail  580  and rear rail  810  at the same time. An engagement device, such as cam  720 , on the front of the divider can be in a position such that the divider  550  can move laterally parallel to the front rail  580  and the rear rail  810 , but the divider  550  is immovable in a direction perpendicular to front rail  580  or rear rail  810  (the direction between front rail  580  and rear rail  810 ). The divider block  802  also can include an engagement device (not shown), such as cam  720  or other engagement devices described above with respect to the front rail  810 . The engagement device on divider block  802  can be in a position such that the divider  550  can move laterally parallel to the front rail  580  and the rear rail  810 , but the divider  550  is fixed in a direction perpendicular to front rail  580  or rear rail  810  (the direction between front rail  580  and rear rail  810 ). 
     In an example, the engagement device on the front of the divider  550  can be moved to a second position. In the second position the divider  550  is fixed in a direction parallel to the front rail  580  under normal operating forces. The engagement device on divider block  802  also can be moved to a second position. In the second position, the engagement device on divider block  802  renders the divider  550  fixed in a direction parallel to the rear rail  810  under normal operating forces. The front rail  580 , divider  550  and rear rail  810  can form a rigid tray that may be moved as a unit from one location to another. The front rail  580 , rear rail  810  and a plurality of dividers  550  can be preassembled and formed into a rigid tray in a location away from the shelf. The front rail  580 , rear rail  810  and a plurality of dividers  550  can then be moved to the shelf and secured to the shelf by one or more fasteners. 
     In an embodiment, a merchandise display system can include a barrier that is moveable by rotation between a folded position and an upright position without the aid of, for example, a rotation biasing element (such as a spring loaded hinge) dedicated to biasing the barrier into the upright position. Various example aspects of example systems that can include a barrier that is moveable between a folded position and an upright position without the aid of a rotation biasing element are shown in  FIGS. 95 through 106 . In an embodiment, the system can include a divider assembly  550  configured to be secured to a support structure. As used herein, a divider assembly  550  can also be referred to as a divider  550 . A support structure can include, for example, a front rail  580 . In an embodiment, a divider  550  can include forward end  553  and a reward end  555 . Movement in the forward direction as used herein in regard to embodiments including a rotational barrier is defined by movement from the reward end  555  toward the forward end  553 . For example, the arrow F depicted in  FIGS. 99B and 100D  is pointing toward the forward direction. Movement in the reward direction as used herein in regard to embodiments including a rotational barrier is defined by movement from the forward end  553  toward the reward end  555 . For example, the arrow R depicted in  FIGS. 99A and 100C  is pointing toward the reward direction. Movement in a lateral direction as used herein in regard to embodiments including a rotational barrier is defined by movement in the directions shown, by example, by arrow A in  FIGS. 65, 100A, and 103A . In an embodiment, a divider  550  can include a divider wall  552  having a right side surface  552   a  and a left side surface  552   b . In an embodiment, the divider wall  552  can extend from the forward end  553  of the divider  550  to the reward end  555 . In an embodiment, the divider wall  552  can extend upwardly from a divider floor  554 . The divider floor can include a top surface  554   a  and a bottom surface  554   b . In an embodiment, the divider wall  552  separates the divider floor  554  into a first side portion  559  and a second side portion  551  on each side of the divider  550 . The first side portion  559  of the divider floor  554  can also be referred to as the right side portion  559  of the divider floor  554  and the second side portion  551  can also be referred to as the left side portion  551  of the divider floor  554 . 
     In an embodiment, barriers  556  are moveable by rotation between a folded position, as shown by example in  FIG. 96B  for the barrier  556   a  on the right side of the divider, to an upright position, as shown by example in  FIG. 96A  for both barriers  556   a ,  556   b . In an embodiment, barriers  556  can be connected to a rotational mounting structure  563 . In an embodiment, the rotational mounting structure  563  can be directly connected to the divider. In an embodiment, as discussed below in reference to examples shown in  FIGS. 102 and 103 , the rotational mounting structure  563  can be removably connected to the divider. Referring to  FIG. 97 , in an embodiment, the rotational mounting structure  563  can be a knuckle  565  and pin  566  type hinge. In an embodiment, the rotational mounting structure  563  can be a flexible member, such as flexible polymer or metal component. 
     In an embodiment, barrier  556  can be considered positioned proximate the forward end  553  of the divider  550  when a product positioned on the top surface  554   a  of the divider floor  554  can contact the barrier  556  when the product moves in the forward direction toward the forward end  553  of the divider  550 . In an embodiment, the rotational mounting structure  563  is proximate to and connected to the forward end  553  of the divider  550  and/or the divider floor  554 . For example, referring to  FIGS. 95, 96A , and  96 B, the barrier  556   a  is shown positioned proximate to and is connected to the forward end  553  of the divider  550  and the divider floor  554 . In an embodiment, the barrier  556  can be positioned proximate to the forward end  553  of the divider  550  and/or the divider floor  554  while being spaced from and/or not being directly connected to either the forward end  553  or the divider floor  554  (not shown). For example, in an embodiment, the barrier can be removably connected to the front rail  580  and not connected to the divider  550  but positioned close enough to the divider such that a product positioned on the top surface  55   a  of the divider floor  554  can contact the barrier  556  when the product moves in the forward direction (not shown). In such example, the barrier  556  can be considered positioned proximate the forward end  553  of the divider  550 . In an embodiment, the barrier  556  can be positioned proximate to the forward end of the divider and be connected to the divider wall. In an embodiment, the barrier can fold toward the divider wall when moving toward the folded position (not shown). 
     Referring to  FIGS. 98A-C , in an embodiment, the barrier  556  is configured to rotate between an upright position and a folded position. An example upright position is shown in  FIG. 98A  and an example folded position is shown in  FIG. 98C . In an embodiment, the top edge  568  of the barrier  556  can rotate along the arc shown as B in  FIG. 98A . For example, a force applied in the reward direction R to a barrier  556  in the upright position can cause the barrier to rotate toward the folded position, as shown in  FIG. 98B , to reach the folded position as shown by example in  FIG. 98C . In addition, for example, the barrier  556  can be rotated manually by digitally pulling or pushing the barrier handle  567  to, respectively, raise the barrier to the upright position or lower the barrier to the folded position. In an embodiment, the top edge  568  of the barrier  556  can rotate along the entire arc of B and C such that the top edge contacts the top surface of the divider floor (not shown). 
     In an embodiment, in the folded position, the barrier  556  defines a folded angle C in between a rear surface  569  of the barrier and the top surface  554   a  of the divider floor. In an embodiment, the folded angle C is between about 45 degrees to about 20 degrees. In another embodiment, the folded angle C is between about 30 degrees and 15 degrees. The term “about” as used herein in regard to embodiments including a rotational barrier means plus or minus 5% of the stated value. In an embodiment, the folded angle is about 20 degrees. 
     In an embodiment, a folding stop structure  570  is configured to stop rotation of the barrier  556  toward the divider floor  554  and maintain the barrier at a desired folded angle C in the folded position. In an embodiment, the folding stop structure  570  is a protrusion positioned proximate a lower portion of the rear surface  569  of the barrier. In an embodiment, the folding stop structure is connected to the top surface  554   a  of the divider floor such that the lower portion  587  of the rear surface of the barrier contacts the folding stop structure  570  when barrier reaches the folded angle C in the folded position. In an embodiment, the folding stop structure is connected to the lower portion of the rear surface of the barrier so that the folding stop structure contacts the top surface of the divider floor when the barrier reaches the desired folded angle in the folded position (not shown). In an embodiment, the folding stop structure is an extension or plateau or plate secured to or integral with the divider floor  554 . In an embodiment, the divider floor prevents the barrier  556  from becoming completely horizontal. The barrier  556  is configured such that when the barrier  556  is rotated to the folded position, the barrier is at an angle from horizontal. This angle can be about 10 degrees, 15 degrees, 20 degrees or between about 20-45 degrees or between about 10-35 degrees. In an embodiment, the barrier has a horizontal portion and a vertical portion that allow the barrier  556  to be at a predetermined angle to the divider floor when the barrier  556  is in contact with the divider floor  554 . In an example, the stop structure  570  does not exist and the barrier  556  contacts the divider floor  554  directly on the horizontal top surface  554   a  of the divider floor. 
     Referring to  99 A-C, in an embodiment, a force applied in the forward direction to a product positioned in contact with at least a portion of the rear surface  569  of the barrier  556  while the barrier is in the folded position can cause the barrier to rotate from the folded position to the upright position. For example, referring to  FIG. 99A , a product can be placed on the top surface  554   a  of the divider floor  554  while the barrier is in the folded position. In an embodiment, a force can be applied to the product to move the product in the forward direction toward the barrier, as shown by example in  FIG. 99B . In an embodiment, the force is gravity. For example, a divider  550  positioned so that the forward end  553  is angled downwardly relative to the reward end can cause products positioned thereon to move by gravity alone toward the forward end  553 . In an embodiment, the force can be applied by a pusher mechanism  520 . In an embodiment, the pusher mechanism  520  can be biased in the forward direction and can be configured to slide across the divider floor and move the product in the forward direction. In an embodiment, the top edge  568  of the rear surface  569  of the barrier is rounded off or defines a curved or radiused surface. The rounded edge of the top of the rear surface of the barrier assists in rotation of the barrier by, for example, allowing the barrier  556  to slip or slide up the surface of the product as the movement vector of the barrier changes while rotating toward the upright position as the product moves forward. In addition, for example, the rounded edge prevents the edge from digging into the surface of the product packaging and maintains a low friction between the rounded edge and the product as the product moves forward and the rounded edge moves up the surface of the product. In an embodiment, the top of the barrier can include other structures to facilitate the sliding of the barrier up the surface of the product such as, for example, a roller structure. In an embodiment, when the barrier reaches the upright position, the barrier ceases rotation and ceases movement of the product in the forward direction. In an embodiment, a vertical stop structure is configured to stop rotation of the barrier in the forward position and establish the upright position of the barrier. In an embodiment, the vertical stop structure can be a vertical surface  571  on the rotational mounting structure and an opposing vertical surface  572  on the barrier  556 . 
     Referring to  FIGS. 100A-D , in an embodiment, aspects of a rotational barrier described in the examples above can be used, for example, in an embodiment of merchandise display system that includes a pair of dividers  550   a ,  550   b  and a pusher mechanism  520 . The dividers  550   a ,  550   b  can define a product pocket  573  in between the opposing walls of the dividers. The product pocket  573  can, for example, have a width that is slightly greater than a product which is intended to be displayed in the system. In an embodiment, the barriers can be positioned in the folded position as shown in  FIG. 100B  to facilitate placement of the product in the system. In addition, in an embodiment, manual positioning of a product against the front surface  556   f  of the barriers in the upright position and pushing of the product in the reward direction against the front surface  556   f  of the barriers can cause the barriers to rotate to the folded position and allow the product to be easily inserted into the product pocket  573  as shown in  FIG. 100C . In an embodiment, once the product is positioned in the product pocket on the top surfaces of the divider floors and against the front surface of the pusher mechanism, and then released, the pusher mechanism pushes the product in a forward direction F and causes the product to rotate the barriers from the folded position to the upright position, as shown in  FIG. 100D , where the forward movement of the product is then ceased. 
     In an embodiment, the rotational mounting structure  563  can be removably connected to the divider  550 , front rail  580 , or shelf  234 . In an embodiment, the rotational mounting structure  563  is removably connected to the forward end  553  of the divider  550 . Referring to  FIGS. 102A-D  and  103 A-E, an example removable rotational mounting structure  563  can include a vertical stanchion  591 , horizontal cross beam  593 , and rotational mounts  597   a ,  597   b  connected to the horizontal cross beam  593 . In an embodiment, the vertical stanchion  591  can be an elongate post oriented in the vertical direction and the horizontal cross beam  593  can be an elongate beam oriented horizontally in the lateral direction. In an embodiment, the stanchion can include a gripping structure near the top portion of the stanchion to facilitate manual insertion and removal of the rotational mounting structure  563  onto or off of the divider  550 . In an embodiment, the horizontal cross beam  593  is connected to the vertical stanchion  591  and extends from the opposite sides of the vertical stanchion in a cross-like manner such that a left section  593   b  of the horizontal cross beam  593  extends in a lateral direction from a left side  591   b  of the vertical stanchion  591  and a right section  593   a  of the horizontal cross beam  593  extends in the lateral direction from a right side  591   a  of the vertical stanchion  591 . In an embodiment, a right rotational mount  597   a  is connected to the right section  593   a  of the horizontal cross beam  593  and a left rotational mount  597   b  is connected to the left section  53   b  of the horizontal cross beam  593 . In an embodiment, each section  593   a ,  593   b  of the horizontal cross beam extend to a length about equal to the width of the respective side portions  559 ,  551  of the divider floor  554 . 
     In an embodiment, a rotational mount can include a knuckle and pin type hinge or flexible member. In an embodiment wherein a rotational mount  597   a  is a knuckle and pin hinge, the rotational mount  597   a  can include a first knuckle component  601  and the barrier can include a second knuckle component  602 , the first and second knuckle components are complimentary such that a pin  566  can extend through the first and second knuckle components to form a hinge for rotational attachment of the barrier  556   a  to the rotational mount  597   a  and rotational mounting structure  563 . 
     In an embodiment, a rotational mount  597   a  includes a folding stop structure  570   a  configured to stop rotation of the barrier  556   a  toward the divider floor  554   a  and maintain the desired folded angle C for the folded position. In an embodiment, the folding stop structure  570   a  is a plate  603  extending from and integral with the rotational mount  597   a  or horizontal cross beam  593   a , the plate  603  having a raised or angled portion  615  configured to define the folded angle C. In an embodiment, as described above, the folding stop structure is connected to the lower portion of the rear surface  569  of the barrier so that the folding stop structure contacts the top surface of the divider floor  554  or plate  603  when the barrier reaches the desired folded angle in the folded position (not shown). In an embodiment, the folding stop structure is integral with the divider floor. 
     In an embodiment, a rotational mount  597   a  includes a vertical stop structure configured to stop rotation of the barrier in the forward position and establish the upright position of the barrier. In an embodiment, the vertical stop structure can be a vertical surface  571  on the rotational mount and an opposing vertical surface  572  on the barrier  556 . In an embodiment, the vertical surface of the vertical stop structure of the rotational mount can be within a mount recess  604  defined within the rotational mount  597   a  and the opposing vertical surface  572  on the barrier  556  can be on a tab  605  formed on the bottom portion of the barrier. The mount recess  604  can be of complimentary shape with the tab  605  so that the tab fits into the mount recess  604  when the barrier rotates in the forward direction. 
     In an embodiment, the stanchion  591  can include a mount slot  598  defined in the stanchion which is configured to mate with a front ridge  599  of the divider  550  to removably connect the rotational mounting structure  563  to the forward end  553  of the divider  550 . In an embodiment, the rotational mounting structure removably connects to the divider using clip, cam, or other coupling structure. 
     In an embodiment, referring to  FIGS. 104A-G , an example removable rotational mounting structure  563  can include a horizontal cross beam  593  and rotational mounts  597   a ,  597   b  connected to the horizontal cross beam  593 . In an embodiment, the horizontal cross beam  593  extends in a lateral direction and has a length about equal to the width of respective side portions  559 ,  551  of the divider floor  554 . In an embodiment, a right rotational mount  597   a  is connected to a right section  593   a  of the horizontal cross beam  593  and a left rotational mount  597   b  is connected to a left section  593   b  of the horizontal cross beam  593 . In an embodiment, as shown in  FIGS. 104A-104G , the horizontal cross beam  593  is configured to have a low-profile where the height of the beam over the divider block  802  is minimized. A low-profile horizontal cross beam  593  can provide for more space for product to be inserted over the removable rotational mounting structure  563  from the forward direction into the merchandise display system. 
     In an embodiment, the horizontal cross beam  593  can include a forward extension  593   c  of the horizontal cross beam that extends toward the front of the divider block  802 . In an embodiment, the forward extension  593   c  of the horizontal cross beam  593  can extend forward of the front of the divider block  802  and include an extension hook  593   e  configured to extend downward from the forward end of the forward extension so that the extension hook is positioned in front of the divider block  802  when the removable mounting structure is secured in place on the divider. In an embodiment, the rotational mounting structure includes a forward extension  593   c  and extension hook  593   e  extending from a right section  593   a  of the horizontal cross beam  593  and a forward extension  593   d  and extension hook  593   f  extending from a left section  593   b  of the horizontal cross beam  593 . The forward extensions  593   c ,  593   d  and extension hooks  593   e ,  593   f  can, for example, assist in stabilizing the removable mounting structure on the divider. 
     In an embodiment, the removable mounting structure  563  includes a first plate  603   a  extending from the right rotational mount  597   a  or right section  593   a  of the horizontal cross beam  593  and a second plate  603   b  extending from the left rotational mount  597   b  or left section  593   b  of the horizontal cross beam  593 . In an embodiment, the plates  603   a ,  603   b  can extend in the lateral direction from either side of the rotational mounts  597   a ,  597   b . In an embodiment, the inside edges of the plates  603   a ,  603   b  can be configured to define a mount slot  598  configured to mate the removable mounting structure  563  with the front ridge  599  of the divider  550  to removably connect the rotational mounting structure  563  to the forward end  553  of the divider  550 . In an embodiment, each plate  603   a ,  603   b  can include a folding stop structure  570   a ,  570   b . In embodiment, the folding stop structure can include a raised or angled portion  615   a ,  615   b  configured to define the folded angle C. 
     Referring to  FIGS. 105A-D , in an embodiment, the barrier  556  includes a resilient tab  606  configured to engage a tab recess  604   a  defined in the rotational mount  597  when the barrier reaches the upright position, as shown in  FIG. 105B . The resilient tab  606  is configured to hold the barrier in the upright position when it engages tab recess  604   a . In an embodiment, the tab recess  604   a  is defined in the mount recess  604 . In an embodiment, when a reward force is applied to the barrier, the resilient tab  606  flexes and disengages from the tab recess  604   a  so that the barrier can move toward the folded position, shown in  FIG. 105D . In an embodiment, the mount recess  604  includes a folding stop structure  604   b . In an embodiment, the tab resilient  606  engages the folding stop structure to stop rotation of the barrier  556  toward the divider floor  554  and maintain the desired folded angle of the folded position. In an embodiment, the folding stop structure  604   b  is defined in the mount recess  604  and can be, for example, an angled portion as shown in  FIG. 105A . 
     Referring to  FIGS. 106A-B , example aspects of an example system that can include a barrier moveable between a folded position and an upright position without the aid of a rotation biasing element are shown. In an embodiment, a system can include a divider assembly  550  configured to be secured to a support structure, such as a front rail. In an embodiment, the divider wall  552  can include a divider wall extension  552   a  configured to increase the height of the divider wall. In an embodiment, the divider wall extension  552   a  and the divider wall  552  can include tongue and groove components configured to secure the extension to the divider wall. In an embodiment, the front edge  552   d  of the divider wall can be rounded. The rounded edge can, for example, prevent a product package from catching on the edge and tearing. In addition, the thickness of divider wall can be increased to improve the strength of the wall and, for example, accommodate the tongue and groove components for the divider wall extension. Examples of systems that use divider walls of increased thickness can be useful for heavier products, such as cases of canned soda, which may require more robust aspects of a display system than smaller, lighter products. In an embodiment, the width of the system and barriers can be increased to, for example, accommodate larger products that may require more shelf space. In an embodiment, as shown in  FIG. 106B , the folding stop structure  570  is defined in the divider floor  554   
     In an embodiment, an example method of restocking a merchandise display system is described in reference to  FIGS. 100A through 100D . As shown in  FIG. 100A , a merchandise display system can include a first divider  550   a  and second divider  550   b . The first and second divider can also be referred to as a left side divider  550   a  and a right side divider  550   b . The first and second dividers can include first and second divider walls that extend from the forward end to the reward end of the respective dividers. A product pocket  573  can be defined in between the opposing first and second divider walls. The first divider can include a first barrier  556   c  positioned at the forward end of the divider  550   a  and to the right of the first divider wall. And, the second divider  550   b  can include a barrier  556   d  positioned at the forward end of the second divider and to the left of the second divider wall. The system can include a pusher  520  positioned in between the first and second dividers. The pusher can include a biasing element which biases the pusher in the forward direction F toward the forward ends of the dividers. The barriers  556   c ,  556   d  can be in a first, upright position as shown in  FIG. 100A . Referring to  FIG. 100B , the barriers  556   c ,  556   d  can be positioned in a second, folded position by, for example, digitally moving the barriers into the second position or using the product to push the barriers into the second position while positioning the product in the product pocket. Alternatively, the product can be placed in the product pocket by moving the product over the top of the barriers which are in the first, upright position and directly into the product pocket. Referring to  FIG. 100C , the product can be positioned forward the product pusher and in contact with the front surface of the product pusher so that the product pusher is in position to move the product forward when the product is released. Once the product is released, the pusher  520  moves the product forward so that the product contacts the barriers. When the barriers are in the second, folded position and the product is in the product pocket and released, the pusher can push the product forward so that the product contacts the barriers and moves the barriers from the second, folded position to the first, upright position. The barriers cease the forward movement of the pusher and the product when the barriers reach the first, upright position, as shown in  FIG. 100D . In an embodiment, the product can be positioned in the product pocket by moving the product over barriers which are positioned in the first, upright position. In such example, the pusher can move the product forward until the product contacts the barriers which are in the first, upright position—where then the forward movement of the product will be stopped, as shown in  FIG. 100D . 
     Referring to  FIGS. 101A-F , in an embodiment, a merchandise display system including rotational barriers described above can be used in conjunction with an improved product tray to facilitate efficient stocking of product in the merchandise display system. Referring to  FIGS. 101A and 101B , in an embodiment, an improved product tray  578  can include a bottom surface  574 , right side wall  575 , left side wall  576 , and an alignment flap  577 . In an embodiment, the alignment flap  577  can have a proximate end  579 , a distal end  581 , a right edge  583 , and a left edge  587 . A flap width D of the alignment flap  577  can be defined in between the right edge  583  and the left edge  587  of the alignment flap  577 . In an embodiment, the flap width D is about equal to the width of the product in the product tray  578 . In an embodiment, the length of the alignment flap is defined in a direction perpendicular to the width D. In an embodiment, the length of the alignment flap can vary. In an embodiment, the length of the alignment flap can be about equal to the height of the barrier  556  or the height of the product. In an embodiment, the proximate end  579  of the alignment flap is configured to be connected to the bottom surface  574  of the product tray. In an embodiment, the alignment flap  577  is configured to be positioned in between opposing divider walls of a merchandise display system such that the alignment flap aligns the product tray and the product stored in the product tray with the product pocket so that the product stored in the product tray can be slid from within the product tray, as shown in  FIG. 101D , directly into the product pocket of the merchandise display system, as shown in  FIG. 101E . In an embodiment, a portion of the alignment flap can be tapered toward the distal end to aid in insertion of the alignment flap between the opposing divider walls of the system. In an embodiment, the alignment flap can be used to move the barriers from the upright position to the folded position to facilitate sliding of the product from the product tray into the product pocket of the system. In an embodiment, the alignment flap is positioned within the product pocket such that the alignment flap moves the barriers from the upright position to the folded position (as shown in  FIGS. 101C and 101D ), product can then be slid from the product tray into the product pocket of the system (as shown in  FIG. 101E ), and the alignment flap is removed from the product pocket and removed from contact with the barriers. In such embodiment, in an embodiment with a pusher (as shown in  FIG. 101E ), the pusher can then push the product forward so that the forward-most product contacts the barriers and moves the barriers from the folded position to the upright position. When the barriers reach the upright position, rotation of the barriers ceases and forward movement of the product is stopped so that the forward most product is positioned in the forward-most position in the display system (as shown in  FIG. 101F ). In such example, the alignment flap is used to temporarily move the barriers from the upright position to the folded position for stocking of the system. In an embodiment, the barriers can be physically removed from the system so that the system may be stocked with product. In an embodiment, the barriers can be configured to rotate from the upright position toward the forward direction so that, for example, the top of the barrier extends beyond the front end of the divider in the forward direction. Such position can be referred to as a forward folded position. In an embodiment, the barrier can be configured to rotate from the folded position, to the upright position, and beyond the front end of the divider in the forward direction to reach the forward folded position (not shown). In an embodiment, a barrier that can rotate in the forward direction beyond the forward end of the divider can include a rotational stop and define angles relative to the divider floor as described above in regard to barriers that rotate only between the upright position and folded position as described above. In an embodiment, the barriers can be configured to slide in the lateral direction, left and/or right. In an embodiment, the barriers can be manually positioned in the folded position, upright position, and/or folded forward position. 
     In an example, an unbiased barrier  556  is connected to a divider floor  554 . The unbiased barrier  556  is configured to be adjustable from a first position to a second position. In a first position, the unbiased barrier  556  is configured to inhibit or prevent product on the divider floor  554  from moving beyond the front edge of the divider  550 . In a first position, the unbiased barrier  556  is configured to inhibit product from being placed onto the divider floor  554 . In a first position, the unbiased barrier is configured to be vertical. In a second position, the unbiased barrier  556  is configured to allow product to be placed onto the divider floor  554 . In the second position the unbiased barrier is horizontal or diagonal in respect to the divider floor  554  or shelf or other structure on which the divider  550  resides. In aspects, in the second position the unbiased barrier  556  is configured to be horizontal to the divider floor  554 , or the shelf or other structure on which the unbiased barrier  556  resides; or the unbiased barrier  556 , in the second position, is configured to be rotated or adjusted at a horizontal angle from the divider floor  554 . The horizontal angle from the divider floor  554  can be 20 degrees, can be between approximately 10 and 30 degrees, or can be between approximately 20 and 45 degrees. In an embodiment, the unbiased barrier  556  is configured to have no spring or other biasing element forcing it between a first position and a second position. In an embodiment, the unbiased barrier  556  is configured to be freely adjustable from the first position to the second position. In an embodiment, the unbiased barrier  556  is configured such that it can be moved to the first position and will remain in the first position and can be moved to the second position and will remain in the second position. In an embodiment, the unbiased barrier  556  is configured to be unbiased and to include no biasing mechanism such as a spring or other device that places a force on the unbiased barrier  556  to force the unbiased barrier into the first position or the second position. 
     In various embodiments, including example embodiments as in the previous paragraph, external objects, such as product shown in  FIGS. 99A-99C  or a product tray  578  or alignment flap  577  or a wall of the product tray  578  shown in  FIGS. 101A-101C  or a hand or digit of a human, can move or force the unbiased barrier  556  from the first position to the second position or from the second position to the first position. Product or a tray  578  or alignment flap  577  or a human digit can exert a force on the unbiased barrier  556  such that the unbiased barrier  556  moves from a first position which is substantially vertical to the divider floor  554  to a second position which is diagonal or a second position which is substantially horizontal. In the second position, the unbiased barrier  556  is configured so that product can be placed onto the divider floor  554  and allow for product to be restocked in a prompt manner. After the product has been restocked onto the divider floor  554 , a pusher  520  exerts a force on the product in the direction toward the front of the divider  550  and the front of the product shelf or other structure on which the divider  550  is residing. The pusher can be a spring-urged pusher in which a spring or other biasing unit exerts a force on the pusher, biasing it toward the front of the divider  550 . The spring or other biasing unit is not physically connected to or in direct contact with the unbiased barrier  556 . The product in turn exerts a force on the unbiased barrier  554  that forces the biased barrier into a first position. In the first position, the unbiased barrier prevents the product from moving beyond the front edge of the divider  550  or shelf or other structure on which the divider  550  is secured. 
     In an embodiment, multiple products can be positioned in the product pocket of the system. A consumer can, for example, remove the forward-most product. In such case, for example, the pusher can push the remaining product in the product pocket forward so that the next product in line contacts the barriers and forward movement of the product stops. In such case, a product in the forward-most position is replaced with next product in line, thereby maintaining product in the forward-most position until the product in the pocket  573  runs out. 
     Referring to  FIGS. 107-135 , there is depicted an alternative, exemplary product management display system  1200 . In this embodiment, the divider  1202  and pusher  1204  may be larger than the above described embodiments to work with larger packages on ambient shelves as well as shelves in coolers and freezers. These three applications typically require a larger and more robust divider and pusher than the other alternative embodiments, which is targeted more towards smaller type products, such as health and beauty aid type products. This embodiment and the above described alternative embodiments may be mounted side by side in the same front rail, and may be movable and lockable in position in the manner described herein. For example, the cam  720  may be incorporated into the divider and the display system  1200  may then be mounted to the front rail  580 , as described above. The pusher  1204  may be any of the pushers described above, or may be a pusher that is mounted in or on a track on the divider floor. The pusher  1204  may include a coiled spring, as described herein. 
     As shown in the Figures, the product management display system may be mounted to a rear hang bar  1206  located towards the back of the shelf. A hanger  1208  may be positioned within a cavity formed in the divider and extend the length of the divider. The hook end of the hanger may then be positioned on the hang bar and the entire system may cantilever out from the hang bar. 
     In one embodiment, the hang bar  1206  may be a square tube with a short bracket attached to either end that fits into the gondola uprights of the shelf system. When installed into the gondola uprights, the hang bar  1206  usually only sits an inch or two from the back wall of the gondola. Individual product trays, or sometimes just long hooks or hangers (e.g. hanger  1208 ), are then attached to the hang bar  1206  and cantilever forward. With the use of hangers, the need for a shelf is eliminated. 
     Additionally, the use of hangers allows one to position the product packages closer together vertically and often gives the product a “floating” appearance which may be desirable from a product marketing and management standpoint. The hanger  1208  may be a metal support that is configured to insert underneath or with the cavity formed in the divider. As shown in  FIG. 134 , the metal support may be an elongated substantially planar piece of flat metal. At one end, may be a large “hook”  1210  which fits over the hang bar. 
     In another aspect, as shown, for example, in  FIGS. 116-120 , the product management display system includes a pusher extender  1212  that increases the pushing surface of the pusher. The pusher extender  1212  defines an elongated pusher body having a cavity. The pusher extender  1212  is configured to slide over the pusher wall via the cavity like a sleeve, as shown, for example, in  FIGS. 117 and 118 . The pusher extender  1212  with an enlarged, substantially planar surface thereby creates an enlarged pushing surface for the pusher. The pusher extender  1212  may define numerous shapes and configurations that will provide an increased pushing surface for pushing larger products toward the front of the product display system. It is also contemplated that the pusher extender  1212  can be formed integral with the pusher paddle wall in a molding operation or other formation process. 
     In an alternative embodiment, the product management display system may be a self-contained adjustable tray that could hang on the hang bar  1206 . In an exemplary aspect, each facing or pusher may share a divider with the facing or pusher adjacent to it. This configuration creates a more cost effective system. In another exemplary aspect, multiple facings may be lifted up off of the hang bar  1206  and moved to another location on the hang bar  1206  or on to another hang bar. 
     In another aspect, one can tilt the front of a single divider or multiple dividers upwards on the hang bar  1206  and slide it along the bar individually or as a group. For example, once the user drops the front end of the divider back down on the hang bar  1206 , the divider&#39;s metal hook  1210  wedges onto the hang bar  1206  and the weight of the divider and the product on the divider holds the divider in position on the hang bar  1206 . 
     In one embodiment, as shown for example in  FIG. 108 , the divider may include a notch or cut-away portion  1214  on the rear end of the divider floor that can serve to permit the divider to rest on the flange of the hang bar. The notch or cut-away portion may extend the width of the divider floor therefore creating a contact line that extends the width of the divider. With this configuration, the contact between the divider floor and the hang bar creates a line of contact with the hang bar to further stabilize the divider on the hang bar. As the width of the divider base increases, the line of contact between the divider and the hang bar increases thereby increasing the stability of the divider relative to the hang bar. 
     In another aspect, as shown, for example, in  FIGS. 107, 114-120, and 125  a divider extender  1218  may be used with the divider  1202 . As shown in  FIG. 114 , the divider extender  1218  may slide into the cavity  1222  formed by the divider  1202 . For example, the divider extender  1218  can be provided with one or more projections  1220  that can engage the cavity  1222  formed by the divider  1202 . The divider extender  1218  may be used to increase the height of the divider wall for use with taller or larger products. 
       FIG. 136  depicts another example of a pusher extender  1224 , which is configured to slide over a pusher paddle  1226 . The pusher extender  1224  can be provided with a cavity or pocket  1228  for receiving the pusher paddle  1226  therein. One or more tabs  1230  can extend from the cavity or pocket  1228 , and the tabs  1230  can be arranged vertically on the rear of the pusher extender  1224  so as to engage of the pusher paddle  1226  near its edges. The area extending between the pusher extender  1224  and the edges of the tabs  1230  can be sized slightly smaller than the thickness of the pusher paddle  1226  to create an interference fit between the divider extender  1226  and the pusher paddle  1226 . It is also contemplated that the pusher extender  1224  can be formed integral with the pusher paddle  1226  in a molding operation or other formation process. 
       FIGS. 137-143  depicts additional examples of a pusher extenders  1324 ,  1424  which can be used with any of the pusher mechanisms described herein. The angled pusher extenders  1324 ,  1424  assist in maintaining larger products upright and preventing larger products from falling forward on shelves. In these examples, the pusher extenders  1324 ,  1424  can be provided with a predetermined angles or slants at a predetermined angle from a pusher face or a front retainer such that the product is pushed from the bottom. In this way, the coiled springs of the pusher mechanisms apply a force from the bottom of the angled pusher surface to prevent larger products from falling forward on shelves and help maintain the organizational look of the merchandise display. This arrangement may also make larger product easier to grasp off of the shelf for the user. 
     In addition, a smaller retainer or barrier can be used in conjunction with the pusher extenders  1324 ,  1424  since most of the weight of the product is placed on the pusher extender  1334 ,  1434  and pusher paddle when the shelf is fully loaded. In this way, a better shopping experience can be achieved because the shopper can more easily lift product over a smaller barrier. In addition, new product may be more easily stocked onto the shelves over a smaller barrier. However, it is contemplated that the angled pusher surface can be used in conjunction with larger barriers. 
       FIG. 137  depicts a rear view and  FIG. 139  depicts a front view of the exemplary pusher extender  1324 , which is configured to slide over a pusher, for example, pusher  520  as shown in  FIGS. 106A and 106B .  FIG. 143  shows a pair of pusher extenders  1324  engaged with the pusher assembly of  FIGS. 106A and 106B . As shown in FIG.  139 , the pusher extender can be provided with an angled pusher surface  1342  at a predetermined angle from a pusher face or a front retainer. 
     As shown in  FIG. 137 , the pusher extender  1324  can be formed with a cavity or pocket  1328 . The cavity  1328  can be provided with one or more tabs  1330 , which can be arranged vertically on the rear of the pusher extender  1324  so as to engage the pusher  520  adjacent to its edges. The tabs  1330  can extend from a plane formed by vertical rear surfaces on the rear of the pusher extender  1324 . The pusher  520  or a pusher paddle can be received between the plane defined by the vertical rear surfaces on the pusher extender and the inner edges of the tabs  1330 . Additionally, the pusher extender  1324  can be provided with a rim  1340 , which extends around a circumference of the pusher. In one example, the tabs  1330  can be sized slightly smaller than the thickness of the pusher paddle  520  to create an interference fit between the pusher extender  1326  and the pusher. Openings  1336  can be formed adjacent to the tabs  1330  to provide for a shutoff for a molding operation and can also provide the user with a visual clue as to the alignment of the pusher face  522  and the pusher extender  1324 . 
     Additionally, the pusher extender  1324  can be provided with a series of projections  1332 , which extend from a central wall  1338  formed inside the cavity  1328 . The projections  1332  can be configured to align with horizontal grooves  525  formed on the pusher face  522  to provide for a secure fit of the pusher extender  1324  over the pusher paddle. Thus, installing the pusher extender  1324  over the pusher paddle creates a ratcheting sound as the projections  1332  engage the horizontal grooves  525  formed in the pusher face  522 . The ratcheting sound can indicate to the user that the pusher extender  1324  has been properly installed into place. However, it is also contemplated that the pusher extender  1324  can be formed integral with the pusher in a molding operation or other formation process. 
       FIG. 138  depicts a rear perspective view and  FIG. 140  depicts a front perspective view of another exemplary pusher extender  1424 , which is also configured to slide over a pusher, for example, pusher  520  as shown in  FIGS. 106A and 106B . The embodiment depicted in  FIG. 138  is similar to the embodiment shown in  FIGS. 137 and 139 , where like reference numerals represent like components. However, in the embodiment shown in  FIG. 138 , the surface area of the angled pushing surface  1442  of the pusher extender  1424  can be formed larger for dispensing larger-sized products. The pusher extender  1424  can be formed with a cavity or pocket  1428 . The cavity  1428  can be provided with one or more tabs  1430 , which can be arranged vertically on the rear of the pusher extender  1424  so as to engage the pusher  520  near its edges. The tabs  1430  can extend from a plane formed by vertical rear surfaces on the rear of the pusher extender  1424 . The pusher paddle can be received between the plane defined by the vertical rear surfaces on the pusher extender and the inner edges of the tabs  1430 . Additionally, the pusher extender  1424  can be provided with a rim  1440 , which extends around a circumference of the pusher paddle. In one example, the tabs  1430  can be sized slightly smaller than the thickness of the pusher paddle to create an interference fit between the pusher extender  1426  and the pusher paddle  1426 . Openings  1436  can be formed adjacent to the tabs  1430  to provide for a shutoff in a molding operation and can also provide the user with a visual clue as to the alignment of the pusher face  522  and the pusher extender  1424 . 
     Additionally, the pusher extender  1424  can be provided with a series of projections  1432 , which extend from a central wall  1438  formed inside the cavity  1428 . The projections  1432  can be configured to align with grooves  525  formed on the pusher face  522  to provide for a secure fit of the pusher extender  1424  over the pusher paddle. Thus, installing the pusher extender  1424  over the pusher face  522  creates a ratcheting sound as the projections  1432  engage the horizontal grooves  525  formed in the pusher face  522 . It is also contemplated that the pusher extender  1424  can be formed integral with the pusher in a molding operation or other formation process. 
       FIG. 141  shows a front perspective view of the exemplary pusher extender  1424  engaged with a pusher assembly  1400  in a merchandising display system, which is similar to the embodiments described herein in relation to  FIGS. 95-106   b ,  FIG. 141  shows a rear view thereof. For example, in this embodiment, the pusher assembly  1400  can be provided with a barrier  1456  that is configured to rotate between an upright position and a folded position and can have similar components and features as the barrier  556  described herein in relation to  FIGS. 95-106   b . It is also contemplated that the barrier  1456  can be fixed as described herein. Also the pusher mechanism can be similar to the pusher arrangement described above in relation to  FIGS. 106A and 106B . In this embodiment, the floor  1454  does not include a divider wall, which in certain instances may work more effectively with larger-sized products. Additionally, the pusher assembly  1400  can be secured to a front rail or can hang bar via a cam mechanism as described herein. 
       FIGS. 144A-146B  show example merchandising systems that incorporate the use of roller assemblies  700  having a series of rollers  702  for advancing product instead of product pushers. FIGS.  144 A 1  and  144 A 2  illustrate perspective views of an example divider  550 .  FIG. 144B  illustrates an exploded view of a roller assembly.  FIG. 144C  illustrates an exploded view of a joining method for a roller carriage. FIG.  144 C 1  illustrates an enlarged portion of  FIG. 144C .  FIG. 144D  illustrates another aspect of the joining method of  FIG. 144C .  FIG. 144E  illustrates the joining method of  FIG. 144C  in a near to final assembly.  FIG. 144F  shows a bottom view of the assembled roller carriage according to the method shown in  FIG. 144C .  FIG. 144G  illustrates a perspective view of the example roller carriage.  FIG. 144H  illustrates an exemplary roller  702 .  FIGS. 145A and 145B  depict perspective views of front rails incorporating the example roller assembly.  FIGS. 146A and 146B  depict perspective views of front rails incorporating the example roller assembly where the dividers are provided with an inclined surface. 
     The example merchandise display systems shown in FIGS.  144 A 1 ,  144 A 2 ,  145 A,  145 B,  146 A,  146 B can be similar to the examples of  FIGS. 95-106   b . For example, the dividers  550  can be configured to be secured to a front rail in a similar fashion as the examples of  FIGS. 95-106   b  via a cam as discussed in relation to  FIGS. 92-94C , and can similarly include barriers  556   a ,  556   b  that are configured to rotate from an upright position to a folded position. However, the dividers  550  can be provided with roller assemblies  700  having a series of rollers  702  extending along the floors  554  and adjacent to the divider walls  552 . In this example, to cause the product to advance in the merchandising display system, the divider  550  or shelf supporting the divider can be placed on an incline or a tilt such that the product advances toward the barrier  556   a ,  556   b  instead of including a product pusher to advance product. In one example, the incline can be 6 to 8 degrees. However, other inclines are also contemplated. Additionally as shown in  FIGS. 146A and 146B , the divider floors  554  or the roller assemblies  700  can be provided with a slight incline for advancing product towards the barriers  556   a ,  556   b . Also the front portion  701  of the roller assembly  700  can be provided with a slight incline to assist in the advancement of the product toward the barriers  556 . Although in the examples shown in FIGS.  144 A 1 ,  144 A 2 ,  145 A,  145 B,  146 A,  146 B the product pushers have been removed, it is also contemplated that a central pusher could be incorporated into the dividers  550  for advancing heavier items or for advancing product on level shelves. 
       FIGS. 144A-144G  depict the example roller assembly  700 . The roller assembly  700  can be provided with a carriage  704  configured to hold a series of rollers  702 . As shown in  FIGS. 144A-144G , the number of rollers  702  can vary based on the desired length or depth of the shelf. The roller carriage  704  can be connected to the divider  550  by a series of projections (not shown) that fit into corresponding oval-shaped slots on the divider or guide floor  554   a , which are shown in  FIG. 97  for example. The projections in one example can fit within the oval-shaped slots of the divider floor and can be held securely onto the divider floor via a friction fit. However, other methods of connecting the roller carriage to the divider floor are contemplated. 
       FIG. 144H  shows an example roller  702 . The example roller  702  can be provided with a through hole  703  for receiving a corresponding axle  706  located on the roller carriage  704 . However, it is also contemplated that the roller  702  could be provided with slight recesses on either side of the roller to receive a corresponding axle  706 . Alternatively, the roller  702  could be provided with an integral axle received in the through hole  703 , for example, which could be configured to engage a corresponding hole on the roller carriage  704  to provide for the mounting of the rollers. 
       FIG. 144B  shows an exploded view of the roller carriage  704  and illustrates an example method of manufacturing the roller carriage  704 . The roller carriage  704  can be provided with a first portion or half  704   a  and a second portion or half  704   b . As shown in  FIG. 144B , the first half  704   a  and the second half  704   b  of the roller carriage  704  together can form a floor  708  and two upwardly extending flanges  710 , which extend from a peripheral edge of the floor  708 . The carriage  704  can be provided with corresponding axles or pivots  706  on each side of the tray  704  that are configured to rotationally support each roller  702 . As shown in  FIG. 144B , the carriage  704  can be assembled from the two halves  704   a ,  704   b . During the assembly, the rollers  702  can be aligned onto either the first half  704   a  or the second half  704   b , and the halves  704   a ,  704   b  can be joined together using glue, a sonic weld, or other known method along the roller carriage to form a seam along the floor  708  of the roller carriage  704 . In one example, the rollers  702  can be placed onto a flat surface, and the carriage halves  704   a ,  704   b  can be joined together over the rollers  702  while on the flat surface to form the carriage  704 . 
     Other methods for forming the roller carriage  704  are contemplated. For example, as shown in  FIGS. 144C-F , the first portion or half  704   a  and the second portion or half  704   b  of the roller carriage  704  can be provided with fingers  710  and corresponding recesses  712 . The fingers  710  of the halves  704   a ,  704   b  can be configured to fit within corresponding recesses  712  of the halves  704   a ,  704   b . Additionally as shown in FIG.  144 C 1 , each of the fingers  710  can be provided with a tongue  714  and a corresponding groove  716  to form a tongue and groove attachment of the fingers  710  of the halves  704   a ,  704   b . In this way, a secure bond can be formed between the halves  704   a ,  704   b  to form the roller carriage  704 , and the roller carriage  704  can be configured to be taken apart when desired for maintenance. 
     Also, as shown in  FIG. 144D , the axles  706  may also be provided with a tapered end such that during assembly, the rollers  702  will align properly with the roller carriage  704 . Specifically, once the tapered portions are aligned with the hole in a respective roller  702 , an inside portion of the through hole  703  will be guided up along the tapered end until the axle  706  fully engages the through hole  703  of the roller  702 . In addition the tapered portions of the axles  706  move the rollers  702  up off of the carriage floor  708  so the rollers  702  can freely rotate on the axles  706  during use of the roller carriage  704 . 
     Also in the example shown in  FIG. 144D , the carriage floor  708  can also be formed with curved portions  705  to form a scalloped or wavy surface to accommodate the placement of the rollers onto the carriage  704  during assembly. In this way, the rollers  702  will stay located on the curved portions  705  of the roller carriage  704  during the assembly of the roller carriage  704 , in particular, when the fingers  710  are placed into contact with one another and prior to the tapered portions of the axles  706  engaging the openings in the rollers  702 . In one example, the halves  704   a ,  704   b  can be identically formed components or parts, which can help save on the manufacturing costs of the roller carriage  704 . As shown in  FIG. 144E , the axles  706  engage the openings of the rollers  702  to maintain the rollers  702  on the carriage  704 .  FIG. 144F  illustrates a bottom view of the carriage  704  as assembled. As shown in  FIG. 144F , the fingers  710  can form a square-shaped seam  713  is formed by the edges of the first half  704   a  and the second half  704   b.    
     In an alternative example, the roller carriage  704  can be formed into separate portions or halves that each are provided with overlapping portions, which can be configured to join together. It is contemplated that the roller carriage  704  can be assembled by any known methods including welding, adhesives, or removable fasteners. It is also contemplated that the roller carriage  704  can be formed of several or multiple portions to make up the desired length of the roller carriage  704  to accommodate for the shelf length. 
     As shown in  FIG. 145A  the roller assembles  700  can be configured such that they reside up against a divider wall  552 , which helps to eliminate any gaps that can allow some products to fall into and stop rolling. Additionally, as shown by roller assembly  700  on the front rail  580  in  FIG. 145A , the divider wall can be omitted entirely for certain applications. 
     As shown in  FIG. 145B , the divider walls  554  can be provided with varying sizes to accommodate for different sized products. Also the dividers can be configured as plug in dividers, which can be configured to be removable and placed at any desired location on the divider floors  554 . This arrangement allows for the field assembly of different divider configurations, such as left dividers, right dividers, T-shaped dividers, center dividers and multiple divider heights. 
     The divider assembly of  FIG. 146A  shows the roller carriage  704  supported by an inclined ramp  804  incorporated into the divider assembly of  FIGS. 106A and 106B . In this example, the inclined ramp  804  can be located on a level shelf such that the products are fed toward the barriers  556   a ,  556   b . The inclined ramp  804  may include a vertically extending leg  805  for supporting the roller carriage  704  and products on a shelf. The divider assembly of  106 A and  106 B can therefore be easily converted to a roller arrangement when preferred over a pusher arrangement.  FIG. 146B  shows another example divider  550  which can be formed integrally with the inclined ramp  804  for use on a flat shelf. As shown in  FIG. 146B , the inclined ramp  804  can include a recessed area  803  for receiving the roller carriages  704  therein. 
     Variations and modifications of the foregoing are within the scope of the present invention. For example, one of skill in the art will understand that multiples of the described components may be used in stores and in various configurations. The present invention is therefore not to be limited to a single system, nor the upright pusher configuration, depicted in the Figures, as the system is simply illustrative of the features, teachings and principles of the invention. It should further be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present invention. The embodiments described herein explain the best modes known for practicing the invention and will enable others skilled in the art to utilize the invention.