Patent Publication Number: US-11045017-B2

Title: Shelf-mounted tray and methods relating to same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. national stage application of International Application PCT/US2018/029868, filed Apr. 27, 2018, which international application was published on Nov. 1, 2018, as International Publication WO2018/200997 in the English language. The international application is incorporated herein by reference, in its entirety. The international application claims priority to U.S. Provisional Patent Application No. 62/663,147, filed Apr. 26, 2018, and U.S. Provisional Patent Application No. 62/490,760, filed Apr. 27, 2017, both of which are incorporated herein by reference, in their entireties. 
    
    
     FIELD 
     This invention relates generally to product displays and, more particularly, to pull-out tray merchandisers for front-facing product merchandise for displaying and dispensing product to consumers. 
     BACKGROUND 
     Product displays, such as merchandisers, are frequently used in retail environments to display products for sale. It is advantageous for these product displays to be configured to provide consumers easy access to the displayed product as well as facilitate easy reloading by store employees. In addition to ease of use considerations, manufacturers of product displays seek to minimize materials and manufacturing costs associated with the product displays. 
     One problem with conventional merchandisers is that they typically require intricate structures to make them more user friendly to both end consumers and the retail store clerks or associates who stock and/or restock the merchandisers with displayed product. For example, pull-out tray or drawer-type merchandisers that pull out like a drawer to assist store associates in stocking/restocking the merchandiser often require intricate structures that are expensive to manufacture, hard to assemble, and often require operation of inconveniently located release mechanisms to get the tray or drawer to slide out from the display for stocking or restocking purposes. 
     In addition, conventional tray or drawer type merchandisers require the displayed product to be pressed against pushers during stocking/restocking which can make the merchandiser harder to stock/restock and can cause damage to the product being stocked/restocked depending on how much force is exerted against the product between the person stocking/restocking the displayed product and the pushers of the merchandiser. 
     While some conventional merchandisers allow flexibility by offering adjustable width side members so that the merchandiser can be used to merchandise products of different size, conventional merchandisers do not allow the merchandiser to be repurposed from displaying one product to two separate products or vice versa. 
     In addition, conventional tray or drawer type merchandisers typically have to be suspended from a bar, grid or gondola rear wall rather than set atop a shelf in order to provide a stable and sturdy merchandiser that does not move in unwanted manners (e.g., unwanted vertical, lateral or wobble movement, or pitch, yaw and roll movement, etc.). Unfortunately, there are many applications where it is desirable to utilize a store&#39;s gondola shelving for front-facing or self-facing merchandisers. In such applications, stores are typically left with using a shelf management system that requires the placement of a front rail along the upper front surface of the shelf and connecting dividers, end brackets and pusher mechanisms to the front rail to front face product (sometimes the pushers and dividers or end brackets are combined into an integrated divider/pusher assembly or bracket/pusher assembly). While these shelf management systems have their place in the industry, they do not allow the store associate to pull out the product channel as a tray to stock or restock the unit and, thus, require the associate to reach back into the shelving to stock and restock the shelf management system. 
     Attempts have been made to provide pull-out tray type merchandisers that can be connected to both shelf and bar/grid/vertical wall, however, these require separate base structures to be utilized and, thus, amount to nothing more than two separate tray structures (i.e., one that is shelf mountable and the other that is bar/grid/vertical wall mountable). Such dual product formats are not efficient and require separate tray tooling or molds to be made and maintained. 
     Accordingly, it has been determined that a need exists for improved product display merchandisers that are not only easy to use, for both consumers and store associates, but also minimally expensive to produce and that offer improved features and functions over conventional merchandisers. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       Embodiments of the invention are illustrated in the figures of the accompanying drawings in which: 
         FIG. 1A  is a perspective view of a product display merchandiser according to some embodiments of the inventive subject matter taken from below and in front of the merchandiser (or the lower right front of the unit) and illustrating an exemplary baseless design with the left side member or wing in a first, retracted position and the right side member or wing in a second, extended position. 
         FIG. 1B  is an alternate perspective view of the product display merchandiser of  FIG. 1 , taken from above and in front of the merchandiser (or the upper left front of the unit). 
         FIGS. 1C, 1D, and 1E  are front elevation, rear elevation, and left side elevation views, respectively, of the product display merchandiser of  FIGS. 1A-1B , the right side elevation view being a mirror image of the left side elevation view. 
         FIGS. 1F and 1G  are top and bottom views, respectively, of the product display merchandiser of  FIGS. 1A-E  illustrating the merchandiser with the tray in a first, retracted position. 
         FIGS. 1H, 1I, 1J, and 1K  are alternate perspective, left side elevation, top view, and bottom view, respectively, of the product display merchandiser of  FIGS. 1A-1G  illustrating the merchandiser with the tray in a second, extended position. 
         FIGS. 1L and 1M  are perspective views of an exemplary removable divider illustrating, in  FIG. 1L , one form of mating structure that may be used to mate the divider to the merchandiser unit, and illustrating in  FIG. 1M , an exemplary manner in which the removable divider may be stored on the merchandiser for future use. 
         FIG. 2  is a perspective view of an alternate product display merchandiser in accordance with aspects of the invention taken from above the rear right corner of the merchandiser and illustrating the merchandiser with an alternate form of mounting bracket intended for use with bar mounted systems rather than grid systems, including alternate side members or wings for larger product and an exemplary pusher attachment accessory (note: while a bar mounting bracket and a grid mounting bracket are shown for comparison purposes, it should be understood that the merchandiser would be equipped with either two bar mounting brackets or two grid mounting brackets, rather than a combination of either). 
         FIG. 3  is a top view of an alternate product display merchandiser in accordance with embodiments of the invention illustrating an optional front and/or rear stabilizer member connected to the mounting brackets for stabilizing same. 
         FIG. 4A  is a perspective view of another product display merchandiser in accordance with embodiments of the invention taken from above and behind the merchandiser (or the right rear corner of the unit) and illustrating an alternate baseless tray or drawer type merchandiser design with an alternate manner for adjusting the side members or wings of the unit to adjust width of the merchandiser and an alternate means for securing the tray in the first, retracted position so as to avoid inadvertent movement of the merchandiser to the second, extended position (note: the left side member or wing is adjusted to a wider position than the right side member or wing simply to show that the merchandiser does not have to be setup symmetrically if desired). 
         FIG. 4B  is a perspective view of the merchandiser of  FIG. 4A  taken from below and in front of the merchandiser (or the lower left front corner of the unit) and illustrating the alternate rear stabilizer and adjustable width mechanism of the merchandiser. 
         FIG. 4C-D  are front elevation and rear elevation views of the product display merchandiser of  FIGS. 4A-B  again illustrating how the width of the left side member or wing has been adjusted more than the right (or the left side member has been displaced further from the center of the merchandiser or from a central axis running through the center of the merchandiser than the right side member is from the central axis). 
         FIGS. 4E, 4F, and 4G  are left side elevation, top, and bottom views, respectively of the product display merchandiser of  FIGS. 4A-D  illustrating the merchandiser in the same first, retracted or closed position the merchandiser is illustrated in for  FIGS. 4A-D . 
         FIGS. 4H and 41  are alternate perspective and left side elevation views, respectively, of the merchandiser of  FIGS. 4A-G  illustrating the merchandiser in a second, extended or open position in which a store associate may place the merchandiser for stocking or restocking purposes. 
         FIG. 4J  is an enlarged, partial perspective view of the tray portion of the merchandiser of  FIGS. 4A-41  illustrating how the width of the side members may be adjusted and how a user may keep track of same (again noting the left side member is illustrated as being adjusted to a wider position than the right side member). 
         FIG. 4K  is a cross-section of the merchandiser of  FIG. 4J  taken along line  4 K- 4 K. 
         FIG. 4L  is a partial perspective view of only a portion of the merchandiser of  FIGS. 4A-4K  illustrating the support brackets, first and second stabilizing members and a baffle structure for directing air from a rear of the merchandiser toward the front of the merchandiser and, thus, from the rear of any open-air refrigeration unit the merchandiser may be installed in toward the front of the open air refrigeration unit in order to assist in keeping product within the refrigeration unit at a generally uniform temperature. The front stabilizer also has a first mating structure for engaging a portion of the remainder of the merchandiser unit in order to retain the unit in the retracted position and/or prevent inadvertent movement of the merchandising unit to the second, extended position. 
         FIG. 4M  is a partial perspective view of only a portion of the merchandiser of  FIGS. 4A-4K  illustrating second mating structures for engaging with the first mating structures of the merchandiser portions of  FIG. 4L  in order to retain the merchandising unit in the retracted position and/or to prevent inadvertent movement of the merchandising unit to the second, extended position. 
         FIGS. 4N, 4O, and 4P  are partial perspective views of the stabilizer located at the rear portion of the merchandiser of  FIG. 4L  illustrating from the front ( FIG. 4N ) and rear ( FIG. 4O ) how the baffle is inserted into or nested within the rear stabilizer and how the rear stabilizer is connected to the side members, and further illustrating in  FIG. 4P  what the rear stabilizer looks like when removed from the merchandiser. 
         FIGS. 4Q and 4R  are partial perspective views of the tray and a side member, respectively, depicting one exemplary mechanism for securing a side member to the tray. 
         FIG. 5A  is an exploded view of another product display merchandiser in accordance with embodiments of the inventive subject matter having an alternate manner for adjusting the side member or wings of the unit to adjust width of the merchandiser. 
         FIGS. 5B and 5C  are perspective views of the side members or wings of the product display merchandiser depicted in  FIG. 5A . 
         FIG. 5D  is a perspective view of a tray of the product display merchandiser depicted in  FIG. 5A . 
         FIG. 5E  is a perspective view of a product display merchandiser with a lens removed. 
         FIG. 6A  is a partial perspective view of another product display merchandiser in accordance with embodiments of the inventive subject matter having a mechanism to securely attach a bracket engagement member to a rear stabilizer 
         FIG. 6B  is an exploded view of the bracket engagement member and rear stabilizer of the product display merchandiser depicted in  FIG. 6A . 
         FIG. 6C  is an exploded view of the bracket engagement member of the product display merchandiser depicted in  FIG. 6A . 
         FIG. 6D  is an exploded view of the rear stabilizer of the product display merchandiser depicted in  FIG. 6A . 
         FIG. 7A  is a perspective view of another product display merchandiser in accordance with embodiments of the inventive subject matter in which one or more of the product display merchandiser&#39;s sidewalls or wings is removable. In some embodiments, such product display merchandisers can be arranged in a linear fashion and a sidewall or wing of an adjacent product display merchandiser can provide support for a product displayed in the product display merchandiser. 
         FIG. 7B  is a perspective view of the product display merchandiser of  FIG. 7A  in an extended position in which product can be loaded onto the product display merchandiser from the side. 
         FIG. 8  is a top perspective view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 9A  is a partial rear perspective view of a ventilated merchandising system without plenum plates in accordance with one embodiment of the present invention; 
         FIG. 9B  is a rear perspective view of a base member, separator, tray and mounting brackets of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 10  is a bottom view of a separator, front plate and plenum plates of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 11  is a top perspective view of a base member of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 12  is a top perspective view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 13  is a top perspective view of a ventilated merchandising system with arms expanded and in product loading position in accordance with one embodiment of the present invention; 
         FIG. 14  is a bottom view of a tray and arms of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 15  is a side view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 16A  is a bottom view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 16B  is a bottom view of a ventilated merchandising system in accordance with another embodiment of the present invention; 
         FIG. 16C  is a bottom view of the embodiment in  FIG. 16A , without a base member; 
         FIG. 16D  is a bottom view of the embodiment in  FIG. 16A  with arms expanded; 
         FIG. 16E  is a bottom view of the embodiment in  FIG. 16A  with arms expanded and in product loading position; 
         FIG. 17  is a bottom perspective view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 18  is a top perspective view of a ventilated merchandising system with arms expanded in accordance with one embodiment of the present invention; 
         FIG. 19  is a front view of a ventilated merchandising system with arms expanded in accordance with one embodiment of the present invention; 
         FIG. 20  is a bottom perspective view of a separator and front plate of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 21  is a rear view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 22A  is a top view of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 22B  is a detail side perspective view of the rear portion of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 22C  is a detail side perspective view of the rear portion of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 22D  is a detail top perspective view of the rear portion of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 23  is a detail side perspective view of the rear portion of a ventilated merchandising system in accordance with one embodiment of the present invention; 
         FIG. 24A  is a schematic side view of ventilated merchandising systems with products displayed and installed in a refrigerator or freezer case; 
         FIG. 24B  is a front view of a grid system; 
         FIG. 25A  is a schematic of numerous merchandising systems with products displayed and installed on a grid system; 
         FIG. 25B  is a schematic of numerous ventilated merchandising systems with products displayed and installed in a refrigerator case; 
         FIG. 26  is a schematic view of numerous ventilated merchandising systems installed in a refrigerator case. 
         FIG. 27  is a top perspective view of a ventilated merchandising system in accordance with another embodiment of the present invention; 
         FIG. 28  is an exploded view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 29  is a rear perspective view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 30  is a front view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 31  is a side perspective view of the rear portion of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 32  is a top view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 33  is a bottom view of a tray and side arms of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 34  is a side view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 35  is a bottom view of a ventilated merchandising system in accordance with the embodiment shown in  FIG. 27 ; 
         FIG. 36A  is a perspective view of a baffle system coupled to a merchandising shelf in accordance with another embodiment of the present invention; 
         FIG. 36B  is a perspective view of a standard merchandising shelf to which a baffle system may be coupled in accordance with the embodiment in  FIG. 36A ; 
         FIG. 37  is a perspective view of a baffle system in accordance with the embodiment in  FIG. 36A ; 
         FIG. 38  is a top view of a baffle system in accordance with the embodiment in  FIG. 36A ; 
         FIG. 39  is a bottom view of a baffle system in accordance with the embodiment in  FIG. 36A ; 
         FIG. 40  is a top view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A ; 
         FIG. 41  is a side view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A ; 
         FIG. 42  is a front view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A ; 
         FIG. 43  is a perspective view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A , attached to a grid system; 
         FIG. 44  is a perspective view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A , attached to a grid system; 
         FIG. 45  is a rear perspective view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A , attached to a grid system; 
         FIG. 46  is a side perspective view of a baffle system coupled to a merchandising shelf in accordance with the embodiment in  FIG. 36A , attached to a grid system. 
         FIG. 47A  is a top perspective view of a ventilated merchandising system in accordance with one embodiment of the present invention. 
         FIG. 47B  is a bottom view of the ventilated merchandising system of  FIG. 47A . 
         FIG. 48  is a top perspective view of a base member of a ventilated merchandising system in accordance with one embodiment of the present invention. 
         FIG. 49A  is a top perspective view of a front plate of a ventilated merchandising system in accordance with one embodiment of the present invention. 
         FIG. 49B  is an exploded view of the front plate of  FIG. 49A . 
         FIG. 50A  is a top perspective view of a front plate of a ventilated merchandising system in accordance with another embodiment of the present invention. 
         FIG. 50B  is a bottom view of the front plate of  FIG. 50A . 
         FIG. 51A  is a top perspective view of a front plate of a ventilated merchandising system in accordance with another embodiment of the present invention. 
         FIG. 51B  is a side perspective view of the front plate of  FIG. 51A . 
         FIGS. 52A-F  are front bottom perspective, side bottom perspective, bottom rear perspective, top rear perspective, bottom front perspective, and left-front perspective views, respectively, of another embodiment of a shelf-mounted pull-out tray merchandiser in accordance with aspects of the invention. 
         FIG. 53  is a side perspective view of the rear bracket illustrated in  FIG. 52A  for securing the merchandiser to a shelf. 
         FIGS. 54A-E  are right-side perspective, rear-right perspective, bottom rear-left perspective, front left-side perspective and bottom front perspective views, respectively, of another embodiment of a shelf-mounted pull-out tray merchandiser in accordance with other aspects of the invention, illustrating the merchandiser connected to a side of the shelf (instead of the usual rear of the shelf) for illustrative purposes. 
         FIGS. 55A-E  are additional views of an alternate embodiment of a shelf-mounted pull-out tray merchandiser in accordance with aspects of the invention, with  FIGS. 55A-B  being bottom side perspective and bottom rear perspective views, respectively, and  FIGS. 55C-E  being side perspective, front perspective and side close-up views of the rear spacer accessory illustrated in  FIGS. 55A-B  and illustrating a rear bracket that does not extend beyond the rear end of the merchandiser. 
         FIGS. 56A-B  are rear side perspective and perspective views, respectively, of an alternate rear spacer accessory in accordance with other embodiments of the invention and illustrating a rear spacer accessory with a bracket that extends beyond the rear end of the merchandiser. 
         FIGS. 57A-B  are perspective and enlarged perspective views of a conventional retail store gondola shelf illustrating existing circular openings in the surfaces thereof and traditional gaps that exist between the rear of the horizontal shelf portion and the vertical upright portion of the gondola. 
         FIGS. 58A-B  are top-right perspective and right-side perspective views of an alternate shelf-mounting accessory for a pull-out tray merchandiser in accordance with other embodiments of the invention illustrating a rear bracket with an optional spacer mechanism for filling the gap illustrated in  FIGS. 57A-B  to securely hold a shelf-mounted tray to the shelving unit. 
         FIGS. 59A-E  are top rear perspective, top, rear elevation, right side elevation and cross-sectional views, respectively, of another shelf-mounting accessory in accordance with embodiments of the invention, with the cross-section of  FIG. 59E  being taken along line  59 E- 59 E in  FIG. 59C . 
         FIG. 60  is a left-front perspective view of an alternate shelf-mounting accessory in accordance with the invention illustrating a rear bracket that has male mating members for mating with existing female structures in a pull-out tray and a lower return portion that can be adjusted to different positions in order to accommodate shelves of different thicknesses. 
         FIG. 61  is a left-front perspective view of an alternate shelf-mounting accessory in accordance with the invention illustrating a rear bracket that has an alternate mating structure for engaging the rear of the pull-out tray merchandiser and having a lower return portion that can be adjusted to different positions in order to accommodate shelves of different thicknesses. 
         FIGS. 62A-C  are top perspective, bottom rear perspective and bend pattern views of an alternate shelf-mounting accessory in accordance with embodiments of the invention illustrating a metal bracket that mounts to a pull-out tray via metal support arms similar to those used to mount the tray to a bar/grid/vertical gondola upright wall. 
         FIG. 63  is a perspective view of a shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 64  is a perspective view of an alternate shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 65  is a perspective view of an alternate shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 66  is a perspective view of one end of an alternate shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 67  is a perspective view of one end of an alternate shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 68A  is a perspective view of a front portion of a product display merchandiser with a pull out tray having an alternate shelf-mounting accessory in accordance with other embodiments of the invention. 
         FIG. 68B  is a perspective view of the shelf-mounting accessory of  FIG. 68A . 
         FIG. 69A  is a perspective view of a shelving unit having a shelf having an alternate shelf-mounting accessory in accordance with other embodiments of the invention. 
         FIG. 69B  is an expanded view of the shelf of  FIG. 69A  showing the shelf-mounting accessory. 
         FIG. 69C  is an end view of the shelf-mounting accessory of  FIGS. 69A-69B  showing a cooperating shelf-mounting accessory for a pull-out tray. 
         FIG. 70  is an end view of an alternate shelf-mounting accessory for a shelf surface in accordance with other embodiments of the invention. 
         FIG. 71  is an end view of an alternate shelf-mounting accessory for a shelf surface in accordance with other embodiments of the invention. 
         FIG. 72  is a perspective view of one end of an alternate shelf-mounting accessory for a pull-out tray in accordance with other embodiments of the invention. 
         FIG. 73A  is a perspective view of a product display having a shelf mounting accessory in accordance with other embodiments of the invention. 
         FIGS. 73B-73C  are left and right perspective views of the product display of  FIG. 73A . 
         FIG. 73D  is a perspective view of the product display of  FIGS. 73A-73C  with the shelf-mounting accessory for a shelf surface removed to better illustrate the shelf-mounting accessories for the trays. 
         FIG. 74  is a perspective view of a product display having a shelf mounting accessory in accordance with other embodiments of the invention. 
         FIG. 75  is a perspective view of a product display having a shelf mounting accessory in accordance with other embodiments of the invention. 
         FIG. 76A  is a perspective view of a product display having a shelf mounting accessory in accordance with other embodiments of the invention. 
         FIGS. 76B-76C  are exploded views of the product display of  FIG. 76A . 
         FIGS. 76D-76E  are top and bottom perspective views of the shelf mounting accessory for the tray of the product display of  FIGS. 76A-76C . 
     
    
    
     Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale or to include all features, options or attachments. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments of the present invention. Certain actions and/or steps may be described or depicted in a particular order of occurrence while those skilled in the art will understand that such specificity with respect to sequence is not actually required. The terms and expressions used herein have the ordinary technical meaning as is accorded to such terms and expressions by persons skilled in the technical field as set forth above except where different specific meanings have otherwise been set forth herein. 
     DESCRIPTION OF THE EMBODIMENTS 
     Many variations of product displays are discussed herein and even further are contemplated in view of this disclosure. The product displays discussed herein are configured, and designed, to hold and display product that is for sale and to front face this product so that the next item in the display is moved to the front of the display as the product in front of it is removed from the merchandiser. While many variations of product display are described and contemplated herein,  FIGS. 1A-1M , and the associated text, generally depict and describe a first embodiment of a product display, wherein the product display has a baseless design,  FIG. 2  and its associated text generally depict a second embodiment,  FIG. 3  and its associated text generally depict a third embodiment,  FIGS. 4A-R , and the associated text, generally depict and describe a fourth embodiment of a product display merchandiser, wherein the product display merchandiser has an adjustable width and a unique stabilizing structure,  FIGS. 5A-5E , and the associated text, generally depict and describe a fifth embodiment of a product display merchandiser, wherein the product display merchandiser has an alternate mechanism for adjusting the position of, and securing, the sidewalls or wings and alternate structures for retaining displayed product in the merchandiser when the lens is removed,  FIGS. 6A-6D , and the associated text, generally depict and describe a sixth embodiment of a product display merchandiser, wherein the product display merchandiser includes a mechanism to securely attach a bracket engagement member to a rear stabilizer, and  FIGS. 7A-7B , and the associated text, generally depict and describe a seventh embodiment of a product display merchandiser, wherein the product display merchandiser includes one or more removable sidewalls or wings for use in unison with one or more other product display merchandisers. Although seven main embodiments are shown, it is understood that features from any one embodiment may be combined with features of other embodiments to come-up with yet further embodiments that are intended to be covered by this disclosure and the following claims despite not being illustrated in a specific drawing figure for same. 
       FIGS. 1A-1M  illustrate an exemplary embodiment of a product display merchandiser  100 , according to some forms of the inventive subject matter. The product display merchandiser  100  includes a tray  102  for holding a product to be displayed. The tray  102  is supported underneath by arms, support members, brackets, or “blades”  116 . The arms  116  include bracket engagement members  112  that attach to a rear support member (not shown), such as a vertical upright of a conventional gondola or other store shelving system. The rear support member can be any suitable support member such as conventional grid-type systems, bar type systems, shelves, etc. The product display merchandiser  100  can also have one or more stabilizers positioned in various locations on the product display merchandiser  100 . For example,  FIG. 1  depicts a stabilizer  114  positioned between the bracket engagement members  112  near the rear of the product display merchandiser  100 . In some embodiments, the product display merchandiser  100  can include a stabilizer, in addition to or in lieu of the stabilizer  114 , near the front of the product display merchandiser  100 . The stabilizer  114  (as well as any other stabilizers) can be sized so as to accommodate trays of multiple dimensions. The product display merchandiser  100  can also include a lens  106  for holding and displaying signage, preventing product from falling out of the tray  102 , etc. Such a lens can be formed from any suitable material and in any suitable manner. For example, the lens can be extruded or injection molded plastic. Additionally, in one form, the lens can have perforations which allow for easy snap-off type custom-sizing of the lens. 
     In use, the product display merchandiser  100  has multiple positions. In one embodiment, the product display merchandiser  100  can have a closed position (best shown in  FIGS. 1A-1B, and 1E-1G ) for presenting product and an open position (best shown in  FIGS. 1H-1K ) for restocking product. In the closed position, a majority of the tray  102  is positioned over top of the arms  116 . In the open position, the majority of the tray  102  is not positioned over top of the arms  116 . The tray  102  travels along the arms  116  from the closed position to the open position in a direction indicated by arrow  126 . As depicted in  FIG. 1 , the tray  102  includes tracks  120  through which the arms  116  extend. The tracks  120  can take any suitable form. For example, the tracks  120  can comprise a number of individual pieces protruding from the tray  102 , a continuous or semi-continuous channel running along the tray  102 , etc. Additionally, the tracks  120  (and/or arms  116 ) can include ball bearings or any other suitable friction-reducing mechanism. 
     In some embodiments, the product display merchandiser  100  includes a mechanism that resists movement of the tray  102  between the open and closed positions. Such a mechanism can prevent the tray  102  from moving from the closed position to the open position unintentionally. For example, the product display merchandiser  100  can include a handle  110  (also seen in  FIG. 1K ) with first engagement members  108 . The arms  116  can include second engagement members  104  that are complimentary to the first engagement members  108 . Such first engagement members  108  and second engagement members  104  are well-depicted in  FIG. 1E . The engagement members are engaged when the tray  102  is in the closed position. Such engagement resists and/or prevents movement of the tray  102  to the open position. In the embodiment depicted in  FIG. 1 , operation of the handle  110  disengages the engagement members. Such disengagement permits movement of the tray  102  from the closed position to the open position. In one form, the first engagement members  108  disengage from the second engagement members  104  when the handle  110  is displaced in a direction parallel to the movement of the tray  102  across the arms  116  (i.e., in the direction of arrow  126 ). For example, movement of the handle away from the bracket engagement members  112  disengages the first engagement members  108  from the second engagement members  104 . As another example, the handle  110  may displace in a somewhat rotational manner. For example, the handle  110  can be affixed to the tray  102  near a leading edge of the tray (i.e., a portion of the tray opposite the bracket engagement members  112 ). The handle  110  is operated from an end of the handle  110  opposite a side of the handle  110  affixed to the tray  102 . In such embodiments, the handle  110  displaces in a somewhat rotational direction that, for purposes of this specification, can be considered to have a displacement in a direction parallel to the motion of the tray  102  and in a direction perpendicular to the motion of the tray  102 . 
     In one form, the product display merchandiser  100  can include a mechanism that prevents the tray  102  from moving from the open position to the closed position during restocking. For example, the arms  116  and the tracks  120  can include complimentary engagement members that engage when the tray  102  is in the open position. Such engagement members can provide mechanical resistance which must be overcome to move the tray  102  from the open position to the closed position. For example,  FIG. 1I  depicts a product display merchandiser  100  with arms having an arm engagement member  144  which engages a track engagement member  136 . When the tray  102  is in the open position, the track engagement member  136  engages the arm engagement member  144  and provides resistance against the tray  102  moving from the open position to the closed position. In some embodiments, such resistance is physical and is overcome by force being exerted on the tray  102  in a direct of the closed position. In other embodiments, there can be a hook, latch, lever, or other release mechanism which must be utilized to disengage the track engagement members  136  from the arm engagement members  144 . 
     As shown in  FIG. 1B  the product display merchandiser  100  includes a tray  102  and arms  116 . The tray  102  includes tracks  120  through which the arms  116  extend. The tray  102  displaces along the arms  116 . The arms  116  can include bracket engagement members  112  configured to mount to a rear support member (not shown). Although  FIG. 1B  depicts the product display merchandiser  100  configured with bracket engagement members  112  to mount to a rear stabilizer, in some embodiments, the product display merchandiser  100  can be configured to be supported by, attach to, and/or rest on a shelf. 
     The tray  102  includes a right sidewall  124  and a left sidewall  126  (also referred to as a “side members” or “wings”), as well as a lens  106 . In some embodiments, as depicted in  FIG. 1B , either (or both) of the right sidewall  124  and the left sidewall  126  are extendable to accommodate product of varying dimensions. The tray  102  of  FIG. 1B  is depicted with the right sidewall  124  extended. In one form, the right sidewall  124  and left sidewall  126  are incrementally extendable. Additionally, the right sidewall  124  and the left sidewall  126  can be individually extendable or mechanically coupled in such a way that extension of one of the right sidewall  124  and the left sidewall  126  cause extension of the other of the right sidewall  124  and the left sidewall  126 . 
     To further increase compatibility with product of varying dimensions, some embodiments of the product display merchandiser  100  include a removable divider  130 . The removable product divider  130  is shown in greater detail in  FIG. 1L . The removable divider  130  can attach to the product display merchandiser  100  in any suitable manner. For example, as shown in  FIG. 1L , the removable divider  130  can include divider protrusions  148  that mate with slots  118  on the tray  102  (as shown in  FIG. 1G ), slots which mate with protrusions on the tray  102 , a bar that mates with a track on the tray  102 , etc. In some embodiments, the removable divider  130  is mountable at multiple locations of varying distance from the right sidewall  124  and the left sidewall  126 . When removed, the product display merchandiser  100  preferably includes a storage space for the removable divider  130 .  FIG. 1M  depicts one example by which the removable divider  130  can be stored onboard the product display merchandiser  100 . In one form, the tray  102  includes a recess on a bottom side of the tray  102  configured to accommodate and store the removable divider  130 . Alternatively or additionally, as depicted in  FIG. 1M , the tray  102  can include clips  150  (or other suitable connectors) which hold the removable divider  130  in a stored position on the product display merchandiser  100 . 
     In some embodiments (as depicted in  FIG. 1F ) a divider  142  (whether or not removable) can take the form of a “T-shape.” A horizontal portion of such divider  142  can form a product support surface  140 . This product support surface  140  can support a portion of product displayed in the product display merchandiser and a second product support surface  138  located on the sidewall can support another portion of the product displayed in the product display merchandiser  100 . 
     The tray  102  also includes pushers  122 . The pushers  122  act to urge product toward the front of the tray  102  (i.e., front face product) making the product easier to access. Although  FIG. 1B  depicts the tray  102  as including pushers  122 , some embodiments of the inventive subject matter do not include pushers  122  to urge product to the front of the tray. For example, instead of pushers  122 , the product display merchandiser  100  may be configured to incline, or mount on an incline, in a manner in which gravitational force is employed to urge product to the front of the tray  102 . Additionally, although  FIG. 1B  depicts a product display merchandiser  100  including two pushers  122 , some embodiments of the inventive subject matter can include fewer than two pushers or more than two pushers. In embodiments that include pushers  122 , the pushers  122  generally comprise a vertical member and a biasing mechanism. The pushers  122  can employ any suitable biasing mechanism, such as a spring, a counterweight, a pulley system, etc. In some embodiments, the pushers  122  include engagement members (e.g., clips, latches, detents, etc.) that engage with complimentary engagement members located on the tray  102 , tracks  120 , and/or arms  116 . The engagement members and the complimentary engagement members act to maintain the pushers  122  in a restocking position when the tray  102  is in an open position. Maintaining the pushers  122  in the restocking position not only makes restocking easier but also helps prevent product from being damaged during the restocking process. In some embodiments, the pushers  122  are maintained at a backmost portion of the tray  102  during restocking. In some embodiments, the engagement members and the complimentary engagement members automatically disengage when the tray  102  is moved from the open position to the closed position. For example, the tray  102 , tracks  120 , and/or arms  116  can include disengagement members that cause disengagement of the engagement members from the complimentary engagement members.  FIGS. 1D, 1H and 1J  depict one embodiment of such engagement and disengagement members.  FIG. 1J  depicts two engagement members  146  coupled to the pushers  122 . Although  FIG. 1J  depicts an embodiment including two pushers  122  and two engagement members  146 , it is not necessary that there be a one-to-one correspondence between the pushers  122  and engagement members  146 . The two engagement members  146  act (in concert with the complimentary engagement members) to maintain the pushers  122  in the restocking position when the tray  102  is in the open position.  FIGS. 1D and 1H  depict a product display merchandiser  100  having disengagement members  132 . In one form, the disengagement members  132  are linearly aligned with the pushers  122  and correspond one-to-one with the pushers  122 , although embodiments exist that do not have either of these features (e.g., one form may have one disengagement member  132  and three pushers  122 ). The disengagement members  132  act to disengage the engagement members  146  and the complimentary engagement members when the tray  102  is moved from the open position to the closed position. Such action by the disengagement members  132  causes the pushers  122  to be automatically removed from the restocking position. In one form, the disengagement members  132  are protrusions that physically contact one or more of the engagement members and the complimentary engagement members to force disengagement of the engagement members and the complimentary engagement members. 
       FIG. 1C  is a front view of a product display merchandiser  100 , according to some embodiments of the inventive subject matter. The product display merchandiser  100  includes a lens  106 . As previously discussed, the lens  106  can hold and/or display signage, prevent product from falling out of the tray  100 , etc. Such a lens can be formed from any suitable material and in any suitable manner. For example, the lens can be extruded or injection molded plastic. Additionally, in one form, the lens can have perforations which allow for easy snap-off type custom-sizing of the lens. Additionally, the lens  106  can have multiple display sections or channels. For example, the lens  106  may have a first display portion  106 A and a second lens portion  106 B. Although  FIG. 1C  depicts lens  106  as having the second display portion  106 B arranged above the first display portion  106 A, many other configurations exist. For example, the lens  106  may have left and right display sections, or any other combination of two or more display sections. 
     The remaining figures and text describe alternative embodiments of a product display merchandiser. For purposes of convenience, items that are similar to those discussed above with respect to  FIGS. 1A-1M  will be referenced using the same last two-digit number but using a first digit corresponding to the figure number simply to distinguish from one another. For example, in  FIGS. 1A-1M , the product tray is referred to generally by reference number  102 , while the product tray is referred to as  202 ,  302 , and  402 , in  FIG. 2 ,  FIG. 3 , and  FIG. 4A-4R , respectively. 
     While  FIGS. 1A-1M  depict a first embodiment of a product display merchandiser  100 ,  FIG. 2  depicts a second embodiment of a product display merchandiser  200 , according to some embodiments of the inventive subject matter. The product display merchandiser  200  includes sidewalls  228 , pushers  222 A and  222 B, bracket engagement members  212 , and a pusher attachment  252 . The pusher attachment  252  attaches to the pusher  222 B to expand the surface area of the pusher  222 B. Additional types of pusher attachments exist. For example, pusher attachments can be designed for specific products, to minimize the surface area of the contact point with a product, to extend the depth of the pusher, etc. Additionally,  FIG. 2  depicts a bracket engagement member  212  that is configured to engage a bar mounted system (not shown). Additionally,  FIG. 2  depicts an embodiment of a product display merchandiser in which a horizontal portion of the sidewall  228  (i.e., the product support  238  portion of the sidewall) is roughly equal in area to a vertical portion of the sidewall  228 . 
     While  FIG. 2  depicts a second embodiment of a product display merchandiser,  FIG. 3  depicts a third embodiment of a product display merchandiser  300 , according to some embodiments of the inventive subject matter. The product display merchandiser  300  includes a tray  302  that is slidable along arms  316 . The tray  302  includes tracks  320  disposed on the bottom side of the tray  302 . The arms  316  are seated in the tracks  320 . The tray  302  moves in a direction as indicated by arrow  326  from an open position (shown) to a closed position (not shown). When in the open position, a void (or unobstructed opening)  358  is revealed (i.e., the product display merchandiser  300  has a baseless design). The void  358  is bounded on a left side and a right side by arms  416 , on a front side by front stabilizer  354 , and on a rear side by rear stabilizer  356 . The tray also includes pushers  322 A and  322 B which are movable within in the tray  302  and a handle  310 . In some embodiments, the handle  310  is operable to disengage engagement members so as to allow the tray  302  to be moved from the closed position to the open position. In one form, the tray  302  includes a divider  330 / 342 . The divider  330 / 342  can be fixed to the tray  302  or removably attached to the tray  302 . 
     While  FIG. 3  depicts a third embodiment of a product display merchandiser,  FIGS. 4A-4R  depict a fourth embodiment of a product display merchandiser  400  having an extendable tray width. 
       FIG. 4A  is an upper perspective view of a fourth embodiment of the product display merchandiser  400  having adjustable side members  428 , according to some embodiments of the inventive subject matter. The product display merchandiser  400  depicted in  FIG. 4A  has one pusher  422  and movable sidewalls  428 . The sidewalls  428  are extendable from the tray in directions indicated by arrows  426 . Extension of the sidewalls  428  allows for the tray width to be adjusted. The tray also includes first mating members  476  (best shown in  FIG. 4Q ) into which corresponding protrusions  478  (best shown in  FIG. 4R ) can seat to secure the sidewalls  428  in an extended position. In some embodiments, a horizontal portion of the sidewalls  428  includes second mating members (e.g., protrusions  478  extending from the horizontal portion of the sidewalls  428 , as depicted in  FIG. 4R ) which fit into the first mating members  476 . In some embodiments, the second mating members “snapfit” into the first mating members  476 . For example, a person can lift an edge of one of the sidewalls  428  to disengage the second mating members from the first mating members  476 . In one form, the sidewalls  428  are secured to the product display by one or more housing members or cords. Such housing members or cords can prevent the sidewalls  428  from becoming completely detached from the product display merchandiser  400  when disengaged. Once disengaged, the person can slide the sidewall  428  in and out until a desired spacing is achieved. Once the desired spacing is achieved, the person can push the sidewall back into place to reengage the second mating members  478  with the first mating members  476  (i.e., snap the second mating members  478  into the first mating members  476 ). In some embodiments, each of the sidewalls  428  are independently movable. For example, a first of the two sidewalls  428  can be moved, and then a second of the two sidewalls  428  can be moved independently of the first. In other embodiments, the sidewalls  428  can be coupled in such a manner that when one of the two sidewalls  428  is moved, the other of the two sidewalls  428  moves in a corresponding manner. 
     In some embodiments, the product display merchandiser  400  includes linear guides  477 , depicted in  FIGS. 4J and 4K . The linear guides  477  help ensure that the sidewalls  428  travel linearly with respect to the product display merchandiser  400  when moved between positions. In one form, the linear guides  477  are protrusions that are seated in recess disposed in a horizontal portion of the sidewalls  428 . 
     Although  FIG. 4Q  depicts the first mating members  476  as incrementally spaced slots, any suitable mechanism for securing the sidewalls in an extended position may be employed. For example, one continuous aperture extending in a direction parallel to the direction in which the sidewalls  428  extend can be utilized. In such embodiments, any suitable fastener (e.g., a screw and nut combination) can be used to secure the sidewalls in an extended position. For example, a horizontal portion of the sidewalls can include a threaded shaft which protrudes through the continuous aperture. In such embodiments, the sidewall can be secured with a nut fastened to the threaded shaft. Alternatively, the horizontal portion of the sidewall can include an internally threaded aperture and the sidewall can be secured by inserting a screw through continuous aperture into the internally threaded aperture. Although multiple examples are given for the first mating members  476 , numerous additionally possibilities exist and are considered within the scope of the teachings herein. 
     Additionally, although  FIG. 4R  depicts the second mating members  478  as protrusions and the first mating members as incrementally spaced slots, any suitable combination of second mating members  478  and first mating members  476  can be used. For example, the second mating members  478  can be shaped as pegs and the first mating members  476  can take the form of complementarily apertures in which the pegs can be seated. 
       FIG. 4B  is a lower perspective view of the product display merchandiser  400  depicted in  FIG. 4A . As seen in  FIG. 4B , the product display merchandiser  400  includes tracks  420  (also well-depicted in  FIG. 4M ) through which arms  416  extend. The tray  402  is slidable along the arms in a direction as indicated by arrow  426  from a closed position (shown in  FIG. 4E ) to an open position (shown in  FIG. 41 ). 
       FIG. 4B  also depicts a baffle  460  inserted on the underside of the product display merchandiser  400  and secured by a rear baffle mount  462  and a front baffle mount  464 . The baffle  460  can server many different purposes, depending on a shape of the baffle  460 , a material from which the baffle  460  is made, and a position of the baffle  460  within the product display merchandiser  400 . For example, the baffle  460  can server to direct airflow through or around the product display merchandiser  400 . Additionally, in some forms, the baffle  460  can be removably attached to the product display merchandiser  400  by insertion and removal from the rear baffle mount  462  and the front baffle mount  464 . 
     The arms  416 , baffle  460 , rear baffle mount  462 , front baffle mount  464  are well-depicted in  FIG. 4L .  FIG. 4L  also depicts a first tray engagement mechanism  468 A- 468 D which acts to maintain the tray  402  in the closed position. A second tray engagement mechanism  470  (best shown in  FIG. 4M ) mates with the first tray engagement mechanism  468 A- 468 D when the tray is in the closed position. In some embodiments, such as those depicted in  FIG. 4P , the rear baffle munt  462  and insert support surface  474  are integral to the rear stabilizer  456 . Additionally, the rear stabilizer  456  can attach to the arms  416  via stabilizer engagement members  472 . 
     While  FIGS. 4A-4R  depict a fourth embodiment of a product display merchandiser  400  having an extendable tray width or adjustable width feature,  FIGS. 5A-5E  depict a fifth embodiment of a product display merchandiser  500  having an alternate manner for adjusting the width of the side members  528 ,  524  and securing them in position so that they cannot be moved once the merchandiser is stocked with product and installed on a shelf, grid or bar. 
     The product display merchandiser  500  of  FIG. 5  includes a left sidewall  528 , a right sidewall  524 , a tray  502 , arms  516 , a removable divider  530 , a lens  506 , and rear stabilizer  556 . The left sidewall  528  and right sidewall  524  are securable to the tray  502 . The tray  502  mounts to, and is supported, by the arms  516 . In a preferred form, the tray  502  is slidable along the arms  516  to an open or extended position making loading product onto the product display merchandiser  500  easier and in a manner that does not require a separate base structure that the tray slides upon. 
     The positions of the left sidewall  528  and the right sidewall  524  are adjustable or moveable with respect to the tray  502 . Such adjustability or movability allows the distance between the left sidewall  528  and the right sidewall  524  to be adjusted to accommodate products of varying size and dimension. 
     In one form, the left sidewall  528  and right sidewall  524  include tongue engagement portions  582 , e.g., grooves, (as shown in  FIGS. 5B-5C ) that mate with the tongues  576  on the tray  572 . Although  FIGS. 5A-5E  depict the left sidewall  528  and right sidewall  524  as including tongue engagement portions  582 , in some embodiments, the tray  502  can include tongue engagement portions or grooves  582  and the left sidewall  528  and the right sidewall  524  can include the tongues  576 . In yet other embodiments, the tray  502  may have tongue and tongue engagement portions and the sidewalls  524 ,  528  may have tongue engagement portions and tongues that correspond with and/or mate with those on the tray  502 . In any of these embodiments, the tongues  576  mate with the tongue engagement portions or grooves  582  to secure the left sidewall  528  and the right sidewall  524  in a desired position on tray  502 . In the embodiment shown in  FIG. 5E , the tongues  576  are formed into the tray  502  and include a raised portion that engages the tongue engagement portions of the left sidewall  528  and the right sidewall  524 . The tongues  576  are deformable (e.g., can be pushed from a first, resting position to a second, deformed position) to disengage from the tongue engagement portions  582  and allow the position of one or more of the left sidewall  528  and the right sidewall  524  to be adjusted. 
     In one form, the tongues  576  and/or tongue engagement portions  582  can include a mechanism (e.g., an indexing mechanism) that allows movement of the left sidewall  528  and the right sidewall  524  between predefined or predetermined positions. For example, as depicted in  FIGS. 5A-5E , the tongues  576  include protrusions  584  (e.g., finger members) that seat within the serrated boundaries of the tongue engagement portions  582 . Such embodiments allow for very fine adjustments of the left sidewall  528  and right sidewall  524 . Further, if it is desired to set the width of the sidewalls of numerous merchandisers to the same width setting, this can be done by counting which groove or serration the tongue should be set to and simply setting the protrusion to that serration for each sidewall. To assist in this effort, indicia may be added to one or more serrations or grooves in order to make quick adjustments to that setting on one or many merchandisers. 
     Although  FIGS. 5A-5E  depict tongues  576  as having protrusions  584  and left sidewall  528  and right sidewall  524  as having tongue engagement portions  582  with serrated boundaries, other mechanisms exist for allowing movement of the left sidewall  538  and the right sidewall  524  between predefined positions, such as those depicted and described in  FIGS. 4A-4R  and the associated text, or any other suitable mechanism. Additionally, in some forms, the left sidewall  528  and right sidewall  524  include sidewall tabs  578  that mate with sidewall tab recesses  580  located on the tray  502  to aid in securing the sidewalls to the tray  502  and ensuring a desired position of the sidewalls is retained. Further, as mentioned above, while various tongue and groove type mating structures may be used to mate the sidewalls to the tray, other types of mating engagements may be used and, of these, they may be alternated so that some appear on both the tray and sidewalls. For example, in some forms, dovetail mating configurations or mortise and tenon mating configurations may be used. In still other forms, other protrusion and mating recess type configurations may be used. 
     In addition to simply providing adjustability, the mechanism described above also helps to ensure that the left sidewall  528  and right sidewall  524  will remain in desired positions after the width of the product display merchandiser  500  has been set. For example, to adjust the position of the left sidewall  528  and the right sidewall  524  the tongues  576  must be manipulated so that they no longer engage the tongue engagement portions  582 . Because the tongues  576  are positioned on the tray  502 , the tongues are not easily accessible when the product display merchandiser  500  contains product. Because the tongues  576  are not easily accessible, it is unlikely that they will be manipulated unintentionally (e.g., by an employee, heavy product, a customer, etc.). Consequently, the left sidewall  528  and right sidewall  524  remain in a relatively fixed position until such position is intentionally altered. Additionally, because the position of the left sidewall  528  and the right sidewall  524  is relatively fixed, some embodiments of the inventive subject matter are able to hold and display heavier products, as it is less likely that such products will cause the left sidewall  528  and the right sidewall  524  to move out of position. This is helpful in avoiding the merchandiser from inadvertently being changed by retailer stocking associates or the like after it has been set or configured in the desired manner to display specific products. 
     In one form, as depicted in  FIG. 5E , the lens  506  of the product display merchandiser  500  may be removable. In such embodiments, the product display merchandiser can include stops, or protrusions,  594 ,  596 . Such stops  594 ,  596  can prevent product from falling out of the product display merchandiser  500  when the lens  506  is removed. The stops  594  can be integral to the tray  502  or left sidewall  528  and right sidewall  524 . The stop  596  can be integral to the tray  502  or the center divider  530  (whether or not the center divider is removable). This allows product in certain situations to be advantageously displayed without a lens so that an unobstructed view of the displayed product may be seen by potential consumers. 
     In the form illustrated in  FIGS. 5A-E  the wings or side members  528 ,  524  preferably will define product support surfaces extending inward toward the opposing side member  528 ,  524  for supporting at least a portion of the displayed product. An example of this product support surface is illustrated in  FIG. 5B  for the left side member  528 . This product support surface runs from the rear of the merchandiser toward the front of the merchandiser and terminates in the protrusions or stops  594 ,  596 . In some forms, the side members  528 ,  524  preferably form stops or abutting surfaces that limit how close the side members  528 ,  524  can be moved toward one another. More particularly, the portions of each side member that define the tongue engagement openings or grooves  582  that protrusions or finger members  584  engage form distal ends that abut the opposing side member  528 ,  524  to limit the travel of the side members  528 ,  524  toward one another. In the form illustrated, the side members  528 ,  524  contain additional protruding members coplanar with the portions that define the tongue engagement openings  582  that further serve as abutment surfaces that limit travel of the side members  528 ,  524  toward one another. These additional protrusions or protruding members are illustrated for the left side member  528  best in  FIG. 5C  and are positioned between the portions that define the tongue engagement openings  582 . 
     While  FIGS. 5A-5E  depict a fifth embodiment of a product display merchandiser having an alternate manner for adjusting the side members,  FIGS. 6A-6D  depict a sixth embodiment of a product display merchandiser  600  having a mechanism to securely attach a bracket engagement member  612  to a rear stabilizer  656 . The product display merchandiser  600  includes a left sidewall  628 , a right sidewall  624 , arms  616 , a rear stabilizer  656 , a tray, and bracket engagement members  612 . The arms  616  support the tray and are connected to the rear stabilizer  656  via the bracket engagement members  612 . The arms  616  and rear stabilizer  656  connect to the bracket engagement members  612 . For example, in one form, the bracket engagement members  612  can be fastened to the rear stabilizer  656 . The bracket engagement members  612  engage a vertical support (not shown) such as a bar mounted system or a grid mount system from which the product display merchandiser  600  can hang. In the form illustrated, the bracket engagement members  612  and one arm  616  are formed integral to one another as a metal support arm. 
     The bracket engagement members  612  include a locking receiver  686  that mates with a locking protrusion  688  located on the rear stabilizer  656 . The locking receiver  686  and the locking protrusion  688  mate in such a way as to securely affix the bracket engagement member  612  to the rear stabilizer  656 . The locking receiver  686  and the locking protrusion  688  can take any suitable form. For example, the locking receiver  686  can be an aperture through which the locking protrusion  688  extends, a cavity that receives the locking protrusion  688 , a clip to which the locking protrusion  688  attaches, etc. 
     In the example depicted in  FIGS. 6A-6D , the locking protrusion  688  is a piece of material that extends from the rear stabilizer  656 . The locking protrusion  688  can be integral to the rear stabilizer  656  or a separate piece that is attached to the rear stabilizer  656 . The locking receiver  686  can take the form of an aperture located in the bracket engagement member  612 . As depicted in the  FIGS. 6A-6D , the locking protrusion  688  and the locking receiver  686  are similarly shaped (or correspond in shape) and have a slightly different orientation (e.g., approximately 45° out of alignment). The locking protrusion  688  and the locking receiver  686  can take any suitable shape. In the example depicted in  FIGS. 6A-6D , the locking protrusion  688  and the locking receiver  686  are cross-shaped. In such embodiments, the bracket engagement member  612  is placed onto the rear stabilizer  656  in a first position such that the locking receiver  686  and the locking protrusion  688  are oriented in a similar direction. Once the engagement bracket  612  has passed the locking protrusion  688 , the bracket engagement member  612  can be rotated to a second position, the second position being a display position for the product display merchandiser  600 . Once in the second position, the locking protrusion  688  acts on the bracket engagement member  612  to securely hold the bracket engagement member  612  and the rear stabilizer  656  together. For example, the locking receiver  686  may fit behind a larger portion of the locking protrusion  688  in such a manner as to experience a clamping force or camming force between an inner surface of the locking protrusion  688  and the rear stabilizer  656 . 
     In the form illustrated, the protrusions  688  correspond in shape with the locking receiver opening  686  so that the protrusion may be orientated into a position to be inserted into the opening  686 . The protrusion  688  further defines a cutout, channel or groove that the locking receiver may be aligned with and then one or both the rear stabilizer  656  and integrated arm  616  and engagement member  612  are moved with respect to each other to securely clamp or fasten the integrated arm  616  and engagement member  612  to one end of the stabilizer  656 . The same process is then repeated with the protrusion located on the opposite end of the stabilizer  656 . In a preferred form, the cutout, channel or groove, is configured to either cam against the engagement member  612  or form a friction fit with the engagement member  612 . Thus, once fully assembled, the three pieces (i.e., rear stabilizer and support arms/engagement members  612  are securely connected to one another to minimize play between each item. 
     Additionally, in some embodiments, the rear stabilizer  656  can include an alignment protrusion  692  and the bracket engagement member  612  can include a mating alignment recess  690 . The alignment protrusion  692  and the alignment recess  690  can be positioned in such a manner as to engage when the bracket engagement member  612  is in the second position. The alignment protrusion  692  and alignment recess  690  can aid in assembly of the product display merchandiser  600  and provide greater stability to the product display merchandiser  600 . In a preferred form, the mating alignment recess  690  and protrusion  692  correspond in shape (e.g., both are circular or other curved structures, rectangular or triangular or other polygonal structures, etc.). In addition, while the illustrated rear stabilizer  656  having protrusions  692  on opposing sides of the stabilizer and, thus, the respective engagement members  612  each have a mating recess  690 , it should be understood that in alternate forms, only one side of the stabilizer  656  may include a protrusion and only one bracket engagement member  612  will include a mating alignment recess. 
     Similarly, although  FIGS. 6A-6D  depict the rear stabilizer  656  as having the locking protrusions  688  and the bracket engagement member as having the locking receiver  686 , embodiments are not so limited. For example, in one form, the rear stabilizer  656  can include the locking receiver  686  and the bracket engagement member  612  can include the locking protrusion  688 . Similarly, in some embodiments, the bracket engagement member  612  can include the alignment protrusion  692  and the rear stabilizer  656  can include the alignment recess  690 . Additionally, although many of the figures (including  FIGS. 6A-6D ) depict the arm  616  and the bracket engagement member  612  as a single piece, in some embodiments, the arm  616  is separate from, and attachable to, the bracket engagement member  612 . 
     Similarly, while this engagement has been described as requiring the engagement bracket  612  to be moved or rotated, it should be understood that in the illustrated embodiment, the engagement bracket  612  does not have to move, but rather the rear stabilizer  656  could alternatively be moved or, in yet other forms, both could be moved with respect to each other. The point being that via some movement of either the engagement bracket  612  and/or the stabilizer  656 , the two items are moved from a first position wherein the two items can be removed from one another or connected to one another, and then be moved to or toward a second position wherein the two items are secured to one another via a clamping or camming force or other fastening engagement. This same procedure can be done for the protrusion  688  extending from the opposite side of the stabilizer and the other integrated engagement bracket and support arm illustrated on the opposite side of the stabilizer  656 . 
     While  FIGS. 6A-6D  depict a sixth embodiment of a product display merchandiser having a mechanism to securely attach a bracket engagement member to a rear stabilizer,  FIGS. 7A-7B  depict a product display merchandiser  700  in which one or more of the product display merchandiser&#39;s  700  sidewalls is removable. The product display merchandiser  700  includes a tray  702 , a left sidewall  728  attached to the tray  702 , and arms  716 . The tray  702  is slidable along the arms  716  from a first retracted or closed position (depicted in  FIG. 7A ) to an open, or extended position (depicted in  FIG. 7B ). The product display merchandiser  700  can also include a right sidewall (not shown). In the embodiment depicted in  FIGS. 7A-7B , the right sidewall has been removed from the product display merchandiser  700 . In such a configuration, two or more product display merchandiser  700  can be mounted adjacent to one another so as to utilize one or more sidewalls of an adjacent product display merchandiser(s). For example, all product display merchandisers  700  in an arrangement of product display merchandisers  700  may have their right sidewalls removed (except for the rightmost product display merchandiser). In such a configuration, product presented in a product display merchandiser  700  will be supported on the left by the left sidewall  728  of the product display merchandiser  700  and on the right by the left sidewall of the right-adjacent product display merchandiser. In such embodiments, the tray  702  and one or more of the left sidewall  728  and the right sidewall can be designed in a complimentary manner such that the tray  702  and the left sidewall  728  and/or right sidewall create a continuous or nearly continuous surface. 
     Not only does such a configuration allow product display merchandisers  700  to be placed in closer proximity to one another, but also decreases difficulty in loading the product display merchandisers  700 . For example, most product display merchandisers have two sidewalls and a base, allowing product stocking to be performed only from above the product display merchandiser (e.g., top loading of the merchandiser). In embodiments in which the product display merchandiser  700  includes sidewalls that are removable, product can be stocked from the side (in addition to from above) (e.g., side loaded vs. top loaded). 
     Additionally, product display merchandisers that have removable sidewalls can be configured to have interchangeable sidewalls. For example, sidewalls that are different heights, different widths, made of different materials, different shapes, different colors, etc. may be useful for different products or uses. For example, product display merchandisers can be repurposed for different applications or products by changing the removable/interchangeable sidewalls. 
     An embodiment of a ventilated merchandising system  830  for placement on a grid system  2410  of a refrigerator or cooler case  2420  is shown in the  FIGS. 8-26 . In each FIG, every element number starts with the FIG number. The digits following the FIG number identify the specific elements. Some elements are substantially identical throughout multiple figures, and therefore may only be described once herein. If an element is not expressly described it is assumed to be substantially identical with an element in a previous drawing sharing the same identifying digits. When discussing multiple FIGS at a time, the elements shown across multiple drawings will be referred to in this written description using the first drawing of the group&#39;s FIG number at the beginning. As seen in  FIGS. 8-11 , the system  830  includes a base member  940 , separator portion  1050  and tray  860 . The separator portion  1050  and the tray  860  together form a platform coupled to the base member  940  for supporting products to be displayed. As seen best in  FIGS. 9A-9B , the separator  950  is coupled to the base member  940  by flanges  941 ,  942  which fit into slots  951 ,  952  of the separator  950 . In one embodiment, the slots  951 ,  952  of the separator  950  fit over the flanges  941 ,  942  so that the entire separator  950  is slidably coupled to the base member  940 . As seen in  FIG. 10 , lips  1053 A,  1053 B,  1054 A  1054 B are located on the bottom of the separator  1050 . These lips  1053 A,  1053 B,  1054 A  1054 B fit into a groove  1148  coupled to a button  1147  on the base  1140  (other similar means of releasably engaging the separator  1050  to the base  1040  could also be used). In the first mode of operation, the display mode seen in  FIG. 8 , the front lips  1053 A,  1053 B are fit into the groove  1148 . To disengage the separator  1050  and slide the separator  850  and tray  860  forward away from the rear edge  1145  of the base  840  to the second mode of operation, the loading mode seen in  FIG. 13 , the button  1147  is pressed upward, causing the groove  1148  to move downward away from the separator  1050  and moving the groove  1148  away from the front lips  1053 A,  1053 B. This releases the separator  1050  from the base  940  and allows for the separator  1050  (and tray  860  coupled to the separator  1050 ) to be advanced away from the rear edge  1145  of the base  940  so that the tray  860  can be moved forward to allow easy loading of products onto the tray  860 . The rear lips  1054 A,  1054 B then engage with the groove  1148  to secure the separator  1050  in the second position for loading of the products. When the products have been loaded, the release button  1147  is again pressed upward, moving the groove  1148  away from the rear apertures  1054 A,  1054 B so that the separator  1050  can be slid backward toward the rear edge  1145  into the first position. The groove  1148  then engages again with the front lips  1053 A,  1053 B to secure the tray  860  with loaded products in the first display position. As seen in an alternate embodiment in  FIGS. 16A-16E , the release mechanism may be located on the separator  1650 , and metal supports  16130  may be incorporated into the bottom of the separator  1650  for added stability when separator  1650  is pulled away from the base member  1640  for product loading. 
     As shown in  FIG. 9B , tray  1660  is coupled to separator  1650  by fitting front edge  1663  of tray  1660  into channels  1655 A,  1655 B of separator  1650 . In other embodiments, tray  1660  may be integrally formed with or rigidly coupled to the separator  1650 . Separator  1650  may include a generally rectangular opening  1658  along the length of the separator  1650 . As seen in  FIGS. 8 and 12 , tray  860  includes a generally rectangular opening  1262  that extends along the length of the tray  860  to a distance adjacent the front  1263  and rear  964  edges of the tray  860 . A projection  1272  on the bottom of a pusher plate  1270  snap-fits securely into the opening  1262  of the tray  860 . As is well known in the art, the pusher plate  1270  and a coil spring (not shown), which fits into a trough  1274  of the pusher plate  1270 , serve as means of biasing products toward the front edge  1263  of the tray  860  as products are removed from the tray  860 . The coil spring abuts the pusher plate  1270  and biases the pusher plate  1270  forwardly toward the front edge  1263  of tray  860 . 
     As seen in  FIGS. 15-17 , base  1540  may also include tracks  1649 A,  1649 B into which mounting brackets  1690 A,  1690 B can be fit. Mounting brackets  1690 A,  1690 B are slid into tracks  1649 A,  1649 B to mount system  830  on a wire grid system  2410  in the back of a case  2420 . As seen in  FIG. 24A , grid system  2410  includes a plurality of horizontal  2412  and vertical  2414  bars. Each mounting bracket  1690 A,  1690 B includes one or more hooks  1592  located, when assembled, near the rear edge  1545  of base  1540 . Hooks  1592  hook over horizontal bars  2412  of the grid system  2410  to mount the system  830  in place on the grid  2410 . Base  1540  may include additional tracks  1649 A,  1649 B to accommodate additional mounting brackets  1690 A,  1690 B for mounting the system  830 . Each mounting bracket  1690 A,  1690 B could also include additional hooks  1592  for hooking the mounting brackets  1690 A,  1690 B onto the grid system  2410 . 
     As seen in  FIGS. 16-19 , system  830  may also include adjustable side arms  1680  and  1682  to accommodate different sized products. Arms  1680 ,  1682  are adjustable to contain various sizes of products so that the products do not fall off the tray  860  over the side of the system  830 . Arms  1680 ,  1682  are movable in the directions indicated by arrows E 1 , such that they can be positioned nearer the tray  860  and away from the tray  860 . As seen in  FIG. 14 , arms  1680 ,  1682  are coupled to the tray  860  by flexible tabs  1484 A,  1484 B,  1486 A,  1486 B at the edges of each arm  1480 ,  1482 . Tabs  1484 A,  1484 B,  1486 A,  1486 B fit into slots  1465  near the front edge  1463  of and rear edge  1464  of tray  860 . When arms  1480 ,  1482  are in the first or unexpanded position, tabs  1484 A,  1484 B,  1486 A,  1486 B are fit into the centermost slots  1465  of the tray. To move the arms  1480 ,  1482  away from the tray  860  to the extended position ( FIGS. 13, 19 ), a user can pull outward on the arms  1480 ,  1482  until the tabs  1484 A,  1484 B,  1486 A,  1486 B loosen from the slots  1465 . When the arms  1480 ,  1482  are at the desired position, tabs  1484 A,  1484 B,  1486 A,  1486 B fit into the appropriate slots  1465  to secure that arms  1480 ,  1482  at the desired expanded position. Other means of moving and securing the arms  1480 ,  1482  may be used. Alternatively, side rails may be used in place of arms  1480 ,  1482 . Stationary side arms may also be used in lieu of movable arms  1480 ,  1482 . Arms  1480 ,  1482  may also include vents  1488  to allow the cool air to easily travel to the front of the case  2420 . Also, as seen in an alternate embodiment in  FIGS. 16C and 16D , support arms  1689  may be coupled to base  1640  to provide added stability to the arms  1680 ,  1682  in their extended position. 
     System  830  also includes a front plate  18100 . Front plate  18100  is aligned with the front edge  1263  of tray  860  as seen in  FIGS. 18-19 . The front plate  18100  acts as a product stop so that products do not fall over the front edge  1263  of the tray  860 . Front plate  18100  is coupled to the separator  2050  by a lip  20101  extending from front plate  18100  that fits into recesses  2056  on bottom of separator  2050  (see  FIGS. 10, 20 ). As shown best in  FIG. 50B , snap-fit tabs  50107   b  can be used to fit the lip  20101  into recesses  1056 . As seen in  FIGS. 15 and 22 , front plate  15100  has a curved shape. This shape provides several advantages over traditional flat front plates. First, when bagged products are displayed on the system  830 , the bottom curvature  15102  gives a bigger footprint to the bottom of the bags to help in keeping the bags upright on the tray  860 . Additionally, the top curvature  15104  both helps to keep bagged products upright, and also, with any shape of product used with the system  830 , makes removal of products easier as the products easily slide over the top curvature  15104  for smooth removal from the tray  860  (as opposed to traditional flat plates, which have a blunt straight top edge that can make pulling products over the edge difficult). As seen best in  FIG. 19 , front plate  19100  also provides a display surface on which indicia such as graphics, information, labels, tags or bar codes can be placed. In the embodiment shown, front plate  19100  includes two label holders  19106 ,  19108 . First label holder  19106  is sized to fit standard-sized price tags. The second label holder  19108  includes two protrusions  19108 A,  19108 B to form the top and bottom walls of the label holder  19108 . Because no side barriers are included, second label holder  19108  can accommodate non-traditional sized tags or labels. Second label holder  19108  could also be formed by including differently-sized or shaped protrusions  19108 A,  19108 B and/or spacing the protrusions  19108 A,  19108 B further apart or closer together to accommodate various types and sizes of labels or tags. Front plate  19100  further includes vents  19109 . As seen in  FIGS. 18 and 24 , vents  18109  allow cool air which enters at the rear of the system  830  to flow through and out of the front of the system  830  through the vents  18109  (indicated by arrow A 1 ). 
       FIGS. 49A and 49B  show another embodiment of a front plate. The front plate  49100   a  includes an adapter plate  49111   a  and coupler plate  49113   a . The coupler plate  49113   a  can be coupled to the separator  2050  as described with respect to front plate  18100 . The adaptor plate  49111   a  can be removably coupled to the coupler plate  49113   a  via channels  49115   a  for quick and easy assembly, removal and replacement of the adapter plate  49111   a . Like front plate  18100 , front plate  49100   a  can also include vents  49109   a  and label holders  49108   a . Another embodiment of a front plate is shown in  FIGS. 50A and 50B . Like front plate  18100 , the front plate  50100   b  is curved and includes vents  50109   a  and lip  50101   b . Front plate  50100   b  includes a curved label holder  50106   a , and a short section  50117   b .  FIG. 50B  also shows snap-fit tabs  50107   b  that can be used to fit any front plate of the present invention to recesses  2056  on the bottom of separator  2050 . Yet another embodiment of a front plate is shown in  FIGS. 51A and 51B . Like front plate  50100   b , front plate  51100   c  includes a curved label holder  51106   c , vents  51109   c  and lip  51101   c.    
     System  830  can also include one or more plenum plates  8110 A,  8110 B. Each plenum plate  8110  has a plurality of fingers  8112 . As seen best in  FIGS. 22A-22C , plenum plates  22110 A,  22110 B are attached to base by channels  2249 A,  2249 B molded into the rear edge  1145  of base  1140 . Plenum plates  22110 A,  22110 B are also adjustable. To adjust plenum plates  22110 A,  22110 B a user can slide the plates  22110 A,  22110 B toward ( 22 A) or away from ( 22 B,  22 C) the center of the base  1140  in the channels  2249 A,  2249 B. Plenum plates  8110 A,  8110 B can be adjusted to align with the positioning of the adjustable arms  880 ,  882 , and adjustment also allows alignment of slits  8114  between fingers  8112  with the vertical grid wires  2014 . When mounting the system  830  onto a grid  2410 , fingers  8112  are placed between the vertical grid wires  2414  and pushed through, so that vertical grid wires  2414  slide through slits  8114  and into voids  8116  in the plenum plates  8110 A,  8110 B and system  830  is snap-fit onto the grid system  2410 . As seen in  FIGS. 23 and 24 , the fingers  8112  act to capture cold air which would otherwise drop behind the products (as shown by the lines C 3 ) and guide the cold air into the gap  2344  in the system  830  (shown by the arrow A 1 ) to promote better cooling of the products displayed on the system  830 . 
     System  830  is also effective without plenum plates.  FIGS. 47A, 47B and 48  show one embodiment of system  830  without plenum plates. While the plenum plates are effective to direct cold air into the gap  944 , the placement of the fingers between the vertical grid wires  2014  can be an extra step in the installation process that merchandisers may want to avoid. Without the plenum plates, cold air still flows into gap  944  to sufficiently circulate cold air beneath the products. For these reasons, merchandisers may prefer the system  830  without plenum plates. 
     As shown in  FIG. 24A , cold air is pumped into the case  2420  at the front side of the case in the direction indicated by the arrow C 1 . The cold air then circulates around the bottom of the case  2420  and upward toward the top of the case  2420  along the back wall of the case  2420 , as indicated by the arrow C 2 . Normally, as shown by the dotted line C 3 , the cold air then falls to the bottom of the case  2420  behind the products, meaning cold air is not directed to the products themselves. Not only does the insufficient direct cooling present food safety issues, but the response to the issue is often to increase the amount of cold air pumped into the case  2420  to decrease the overall air temperature in the entire case  2420 . The increased energy necessary to cool the entire case  2420  means an increased expense to the retailer and possible damage to the food from improper temperatures. To attempt to stop cold air from falling behind the products, baffles are sometimes placed between traditional display systems within the case to attempt to stop cold air from falling behind the products and directing it to the products on the shelves. However, as described above, the baffles present a host of disadvantages to the retailer, consumer, and, because of imprecise placement in the case, often fail to sufficiently direct the cold air to the products on the shelves. 
     The current system  830  solves these problems by allowing proper cooling of the products through capturing of the falling cold air (C 3 ) and circulation under the products (A 1 ) in one easy-to-install, versatile, space-saving system  830 . Ventilation of the system  830  works as follows. As seen best in  FIGS. 9A-9B and 24 , the assembled system  830  includes a gap  944  between the base member  940  and the separator  1150 , allowing cold air to pass through the gap  944  and beneath the products displayed on the system  830 . If used, the fingers  8112  of the plenum plates  8110 A,  8110 B help capture the falling cold air (C 3 ) and direct it into the back of the system  830 , above the rear edge  945  of the base  940 , and through the gap  944  beneath the products displayed on the system  830 . The cold air then exits the front of the system  930  through the vents  18109  in the front plate  18100  aligned with the gap  944 . This airflow through the system is indicated by arrows A 1 . By allowing the cold air to flow beneath the displayed products, the food is more directly cooled than in traditional systems, without the use of baffles. The self-ventilating system  830 , by eliminating the need for baffles, allows retailers to increase the number of systems  830  in a case by placing them closer together and without space-wasting baffles in between. Also, as seen in  FIGS. 25A-B  and  26 , systems  830  do not have to be linearly aligned across the case to accommodate baffles, and as such a retailer has more freedom to vary the number and types of systems  830  and products within a case  2420 . 
     In another embodiment shown in  FIGS. 27-35 , the system  830  includes a base member  27400 , separator portion  28500  and tray  27600 . In this embodiment, the separator portion  28500  is stationary and does not slidably connect to the base member  27400 . As seen in  FIG. 28 , the tray  27600  is snap-fit into the separator portion  28500  by inserting shafts  28610  on the bottom of the tray  27600  into holes  28510  in the separator  28500 . The separator  28500  is sized so that it securely snap-fits into the base  27400 . As seen in  FIGS. 30 and 31 , a gap  30440  is provided between the base  30400  and the separator  30500  through which air can flow beneath products on the tray  30600 . 
     Similar to the embodiment including the pull-out features shown in  FIGS. 8-26 , the embodiment in  FIGS. 27-35  includes adjustable side arms  27800  and  27820  to accommodate different sized products by positioning them nearer the tray  27600  and away from the tray  27600 . As seen in  FIG. 33 , arms  27800 ,  27820  are coupled to the tray  27600  by flexible tabs  33840 A,  33840 B,  33860 A,  33860 B at the edges of each arm  27800 ,  27820 . Tabs  33840 A,  33840 B,  33860 A,  33860 B fit into slots  28650  near the front and rear edges of tray  27600 . When arms  27800 ,  27820  are in the first or unexpanded position, tabs  33840 A,  33840 B,  33860 A,  33860 B are fit into the centermost slots  28650  of the tray. To move the arms  27800 ,  27820  away from the tray  27600  to the extended position, a user can pull outward on the arms  27800 ,  27820  until the tabs  33840 A,  33840 B,  33860 A,  33860 B loosen from the slots  28650 . When the arms  27800 ,  27820  are at the desired position, tabs  33840 A,  33840 B,  33860 A,  33860 B fit into the appropriate slots  28650  to secure that arms  27800 ,  27820  at the desired expanded position. Stationary side arms may also be used in lieu of movable arms  27800 ,  27820 . Arms  27800 ,  27820  may also include vents  33880  to allow the cool air to easily travel to the front of the case  2420 . 
     As seen in  FIGS. 27-29, 32 and 33 , tray  27600  includes a generally rectangular opening  27620  that extends along the length of the tray  27600 . Similarly to the embodiment in  FIGS. 8-26 , a pusher plate  27700  snap-fits securely into the opening  27620  of the tray  27600 . The pusher plate  27700  and a coil spring  28710 , which fits into a trough  27740  of the pusher plate  27700 , serve as means of biasing products toward the front of the tray  27600  as products are removed from the tray  27600 . As seen in  FIGS. 29-31 and 34-35 , base  28400  may also include tracks  28490 A,  28490 B into which mounting brackets  28900 A,  28900 B can be fit. Mounting brackets  28900 A,  28900 B are slid into tracks  28490 A,  28490 B to mount system  830  on a wire grid system  2410  in the back of a case  2420  as shown in  FIG. 24A  and described above. 
     Similar to the embodiment shown in  FIGS. 8-26 , the embodiment of system  30  in  FIGS. 20-28  also includes a front plate  1000 . Front plate  1000  is coupled to the separator  28500  by inserting screws  281010  through holes  28505  in the separator and tightening into holes (not shown) in the front plate  271000 . Front plate  271000  also has the curved shape and display surface and advantages of these features as described above with respect to the embodiment shown in  FIGS. 8-26 . Front plate  271000  further includes vents  281090  to allow cool air which enters at the rear of the system  830  to flow through and out of the front of the system  830  through the vents  281090  as described above. 
     In the embodiment shown in  FIGS. 27-35 , system  830  also can include one or more plenum plates  281100 A,  281100 B. As seen in  FIGS. 27 and 29-31 , these plenum plates  281100 A,  281100 B are the same as those described above with respect to previous embodiments, where each plenum plate  281100  has a plurality of fingers  311120 , and plenum plates  311100 A,  311100  are attached to base  31400  by channels  31495 A,  31459 B molded into the base  31400 . Plenum plates  311100 A,  311100 B are also adjustable and can be adjusted to align with the positioning of the adjustable arms  27800 ,  27820 , and adjustment also allows alignment of slits  311140  between fingers  311120  with the vertical grid wires  2414 , where the grid wires  2414  fit in the voids  311160  in the plates  311100 A,  311100 B. In the same way as described above and as seen in  FIGS. 23 and 24 , the fingers  311120  act to capture cold air which would otherwise drop behind the products (as shown by the lines C 3 ) and guide the cold air into the gap  31440  in the system  830  (shown by the arrow A 1 ) to promote better cooling of the products displayed on the system  830 . As with other embodiments, the system  830  is also effective without the plenum plates. 
     The embodiment shown in  FIGS. 27-35  fits into the same types of cases  2420  in the same way as described above and has the same features and advantages as described above. It allows proper cooling of the products through circulation of cold air under the products (A 1 ) in one easy-to-install, versatile, space-saving system  830 . If used, the fingers  311120  of the plenum plates  311100 A,  311100 B help capture the falling cold air (C 3 ) and direct it into the back of the system  830 , above the rear of the base  31400 , and through the gap  31440  beneath the products displayed on the system  830 . The cold air then exits the front of the system  830  through the vents  281090  in the front plate  271000  aligned with the gap  31440 . By directing the cold air to flow beneath the displayed products, the food is more directly cooled than in traditional systems, without the use of baffles. 
     In yet another embodiment of the system  830  shown in  FIGS. 36-46 , a baffle system  372000  is added to a standard merchandising system  362500  to allow cold air to move under the products as described above and shown in  FIGS. 23-26 .  FIG. 36B  shows one example of a standard merchandising shelf  362500  to which a baffle system  372000  may be added. The shelf may include a tray  362510 , a pusher plate  362520 , a front plate  362530 , a coil spring  412540 , side arms  362550 A,  362550 B which may be adjustable, and mounting brackets  362560 A,  362560 B. Other configurations of merchandising systems with additional or modified components may also be used with a baffle system  372000 . By fitting a standard shelf  362500  with a baffle system  372000  as shown in  FIG. 36A , cooling of the products on the shelf  362500  by directing cold air through the baffle system  372000  beneath the products may be accomplished without the need to purchase an entirely new self-ventilating merchandising system. A baffle system  372000  as shown in  FIGS. 37-46  would provide all of the advantages described with respect to the other embodiments contemplated herein (such as proper cooling of products, varied arrangements of shelves in the cases, ventilation without the need for troublesome stand-alone baffles placed between shelves, etc.), but could also be easily coupled to standard merchandising shelves  362500  already in use in refrigerator or freezer cases. 
     One embodiment of a baffle system  372000  in accordance with the embodiment shown in  FIGS. 36-46  that can be added to a standard merchandising shelf  362500  is shown in  FIGS. 37-39 . Baffle system  372000  includes baffle base  372020 , baffle wings  372030 A,  372030 B, wing extensions  372040 A,  372040 B, and plenum plates  372050 A,  372050 B. Baffle base  372020  snap-fits onto the merchandising shelf  362500 , and as seen in  FIGS. 36A and 40-46 , assembled baffle system  372000  works to direct air from the back of the cooler beneath products on the shelf  362500  to provide direct cooling to the products. Baffle base  372020  includes slots  372025  into which plenum plates  372050 A,  372050 B can be slidably fit and allows slidable adjustment of the plenum plates  372050 A,  372050 B. 
     Baffle wings  372030 A,  372030 B snap-fit onto baffle base  372020 . As seen in  FIGS. 37-39 , openings  382032  in wings  382030 A,  382030 B are used to movably attach wing extensions  382040 A,  382040 B to each wing  382030 A,  382030 B. Tabs  382042  on the wing extensions  382040 A,  382040 B friction fit into the openings to allow wing extensions  382040 A,  382040 B to slide toward and away from the center of the baffle base  382020 . This allows wing extensions  382040 A,  382040 B to be adjusted to accommodate larger products which extend beyond the tray  362510  and are held in place by extendable side arms  362550 A,  362550 B and ensure that cold air directed by the plenum plates  372050 A,  372050 B (also adjustable to line up with larger products extending beyond the tray  362510 ) is directed beneath the entire product area. Thus, plenum plates  372050 A,  372050 B, wing extensions  372040 A,  372040 B and arms  362550 A,  362550 B of the shelf  362500  can all be adjusted to accommodate products of varying sizes to ensure that cold air is properly directed beneath the products. Wing extensions  372040 A,  372040 B may also include vents  372045  to allow further circulation of cold air beneath products on the tray  362510  above. 
     As seen best in  FIG. 37 , baffle base  372020  includes a gap  372010 . Similar to the other embodiments shown and described herein, the plenum plates  372050 A,  372050 B in this embodiment capture the falling cold air (C 3 ) and direct it into the back of the system  830 , through the gap  372010  beneath the products displayed on the merchandising shelf  362500 . In the same way as described above and as seen in  FIGS. 23 and 24 , the fingers  382054  of the plenum plates  372050 A,  372050 B act to capture cold air which would otherwise drop behind the products (as shown by the lines C 3 ) and guide the cold air into the gap  372010  in the system  830  (shown by the arrow A 1 ) to promote better cooling of the products displayed on the system  830 . By directing the cold air to flow beneath the displayed products, the food is more directly cooled than in traditional systems. Plenum plates  372050 A,  372050 B, as seen in  FIGS. 43-49 , are adjustable, and adjustment allows alignment of slits  382052  between fingers  382054  with the vertical grid wires  2414 , where the grid wires  2414  fit in the voids  382056  in the plates  382050 A,  382050 B. Thus, when plenum plates  382050 A,  382050 B are adjusted to accommodate products of varying sizes on the shelf  362500 , the slits  382052 , fingers  382054 , and voids  382056  ensure that the system  830  can be attached to a grid. 
     While the embodiments discussed above cover numerous different types of merchandisers and, in particular, several types of pull-out tray merchandisers that are configured to mount to bars, grids and/or vertical gondola uprights, it should be understood that in alternate forms, any of these embodiments may be provided in a shelf-mounted version. In an effort to provide such flexibility without requiring that an entirely separate tray be constructed for on-shelf embodiments (e.g., separate base, separate tooling or molding, etc.), various shelf-mounting accessories will now be discussed which may be used in connection with any one of the above-identified embodiments and/or which may be combined with one or more features from any or all of the above-identified embodiments to come-up with even more embodiments. An exemplary embodiment of such a shelf-mounting accessory is illustrated in  FIGS. 52A-F , which shows the accessory connected to a pull-out tray similar to the one illustrated in  FIGS. 8-51B  in order to make a shelf-mounted version of the tray. In  FIGS. 52A-F , the shelf-mounted tray assembly is referred to generally by reference numeral  52100  and includes a base  52110 , a tray  52120  movably connected to base  52110  and having adjustable width left and right wings  52122   a  and  52122   b , respectively, pusher assembly or paddle  52130  to front face the products disposed in the product channel of tray  52120  via a spring (not shown) like the embodiments discussed above, and a front fence or lens  52140 . Unlike the embodiments discussed above, however, the tray assembly  52100  further includes a shelf-mounting accessory that can be coupled to the tray assembly  52100  to allow the tray assembly  52100  to be mounted to a conventional retail store shelf or shelving unit. 
     In the form shown in  FIGS. 52A-F , the shelf-mounting accessory includes a first spacer, such as first riser  52160  and an end bracket  52180 . The riser  52160  is used to provide space below the tray assembly  52100  so as to access the tray actuator or release button  52120   a . This spacing also forms an air channel below the merchandiser  52100  which can assist air circulating over or through the shelving unit to keep all of the product stored within the product channel between the left and right wings  52122   a ,  52122   b , respectively, more uniformly cooled or chilled and preventing just the products on either end of the product channel from staying cool as compared to the remainder of the products in the product channel. Thus, the gap created between the tray assembly  52100  and the upper surface of the shelf via first riser  52160  serves as a baffle or air duct to promote proper circulation of air when the unit  52100  is used in a refrigerated or cooled/chilled setting or environment (e.g., such as in an open-air cooler). 
     In the form illustrated, the riser  52160  is a molded plastic part that has at least two legs extending down from opposite sides of the tray (generally below the left wing  52122   a  and right wing  52122   b , respectively, at least when the wings are in their narrow most setting). In a preferred form, the riser  52160  will include four legs extending down from opposite corners of the riser  52160  in order to provide greater structure strength and stability to the riser  52160  and tray assembly  52100 . 
     In order to make the riser accessory  52160  usable with respect to the tray assembly  52100  without requiring the tray assembly  52100  to take on a different shape or form (which would require additional tooling or molds, or at least changes to same), the riser is configured with mating recesses located on opposite sides of the riser  52160  that receive the male mating members existing on the tray assembly  52100 , best seen in  FIGS. 52E-F . The left male mating member  52110   a  is a hook or prong that is deformable and capable of moving between a first normally biased position and a second flexed position to allow a solid portion of riser  52160  to pass inside of the male member  52110   a , but once the hook of the male member  52110   a  is aligned with the recess formed in the side of the riser  52160 , the male mating member moves back towards its first normally biased position to engage the riser  52160  and secure it to the base  52110 . A similar male mating member is located on the right side of the base  52110  and a similar recess is located on the right side of the riser  52160 , however, these are not visible in the illustrations shown in  FIGS. 52A-F . 
     In a preferred form, the riser  52160  will take the form of riser  63160  in  FIG. 63 . As illustrated in that drawing, the riser has four legs  63160   a ,  63160   b ,  63160   c  and  63160   d  (e.g., left front leg, left rear leg, right rear leg and right front leg, respectively), which extend down from opposite sides  63160   e ,  63160   f  of a main body member  63160   g . The sides  63160   e  and  63160   f  further define the above-mentioned recesses in the upper portion thereof for receiving the male mating member  52110   a  from base  52110 . Riser  63160  is preferably made of an injection molded plastic and, thus, has a design that is easier to mold (e.g., rounded edges or gentle curves instead of sharp edges, tapering or draft to assist in removal from mold, etc.). 
     In addition to the riser accessory  52160 , the shelf mounting accessory of assembly  52100  in  FIGS. 52A-F  further includes a rear member, such as bracket  52180 , which extends from a rear of the tray assembly  52100  and secures the tray assembly  52100  to a rear portion of the shelf the tray assembly  52100  is mounted on. In the form illustrated, the bracket  52180  both secures the tray assembly  52100  to the rear of the shelf and serves to space the rear of the tray assembly  52100  from the upper surface of the shelf (such as riser  52160  does for the forward portion of the tray assembly  52100 ). In the form illustrated, the bracket  52180  includes a mating member  52180   a  for mating the bracket  52180  to the rear of the base  52110  of tray assembly  52100 . The bracket  52180  extends down from the mating member  52180   a  and forms a shelf  52180   b . From there the bracket extends down again to form a spacer portion  52180   c  and a shelf engaging portion or foot  52180   d  that extends back toward the rear portion of the shelf. The bracket  52180  then extends down again to form a rear portion or rear bracket portion  52180   e  of bracket  52180  and bends back forward to form a return portion  52180   f . Together the foot  52180   d , end portion  52180   e  and return portion  52180   f  form a generally U-shaped structure rotated ninety degrees so as to have an open side face which extends around a rear portion of conventional gondola shelving in order to secure the tray assembly  52100  to the shelf or shelf assembly. 
     In a preferred form, the bracket  52180  will take the shape of bracket  53180  illustrated in  FIG. 53 . As can be seen in this illustration, the mating structure  53180   a  is preferably an inverted U-shaped structure formed from a bend in the bracket  53180 . In one form, mating structure  53180   a  engages a lip formed by a recess at the rear of the tray base  52110 . More particularly, the distal end of mating structure  53180   a  is disposed within a channel formed in the rear of base  52110  (similar to the channels discussed above and illustrated in  FIGS. 22A-C  above, e.g.,  2249 A and  2249 B). The bracket  53180  then bends forward to form shelf  53180   b , down to form riser portion  53180   c , back to form foot  53180   d , down to form rear portion  53180   e  and back forward to form return portion  53180   f.    
     An alternate tray assembly embodiment  54100  is illustrated in  FIGS. 54A-E , which includes many of the same features as tray assembly  52100 , including having a base  54110 , tray  54120  movable about the base  54110 , a pusher  54130  for front facing product in the product channel defined by left wing  54122   a  and right wing  54122   b , and a lens or fence  54140 . The tray assembly  54100  further includes a riser  54160  that is similar to riser  52160  discussed above, however, unlike the embodiment of  FIGS. 52A-F , tray assembly  54100  includes an alternate rear bracket  54180 . In the form shown, bracket  54180  is made of an injection molded plastic instead of a metal and includes a smaller return portion  54180   f  that has a non-linear edge (e.g., as illustrated the return is comprised of a plurality of rounded tabs). For convenience, items in alternate embodiments discussed herein from at least  FIGS. 52A-E  on that are similar to those already discussed, will use the same latter three digit reference numeral but use the prefix of the drawing figure number (e.g.,  52 ,  53 ,  54 , etc.) to distinguish one embodiment from others. 
     Yet another alternate embodiment is illustrated in  FIGS. 55A-E . In this embodiment, the tray assembly  55100  includes a base  55110 , tray  55120  movable about the base (e.g., extensible or extendible along the base) with left and right wings,  55122   a ,  55122   b , respectively, a pusher  55130  and lens or fence  55140 . However, unlike prior embodiments, the shelf mounting accessory includes a first riser  55160  and a second riser  55170 . The second riser  55170  is connected to mating structures on the base  55110  similar to how the first riser  55160  is connected to base  55110  (e.g., male protrusion or mating hook member  55110   a ). Like first riser  55160 , second riser  55170  includes first and second recesses on opposite sides of the riser  55170  that mate with mating members on opposite sides of base  55110 . Since only the left side is visible, only mating structures  55110   a  and  55110   c  are illustrated. 
     In the embodiment of  FIGS. 55A-E , the shelf mounting accessory further includes a bracket  55180  which is connected to the second riser  55170 . In a preferred form, the bracket  55180  is connected to the second riser  55170  via a fastener (e.g., screw, bolt, rivet, adhesive, hook and loop structures, etc.), however, in alternate forms, it should be understood that the second riser  55170  and bracket  55180  could be formed as an integral structure. It also should be understood that with all of the components discussed herein, while they may be shown in a preferred form such as bended metal, molded plastic, etc. It should also be understood that different shapes and sizes of these components may be used to perform the same function to accommodate different end uses and/or needs or constraints relating to the desired end use. 
     In the embodiment of  FIGS. 55A-E , the bracket  55180  does not extend beyond the rear of the tray assembly  55100 . This may be desirable in some situations where a short or non-deep shelf is to be connected to and it is desired for the merchandiser  55100  to extend beyond the rear of the shelf to increase the amount of product that may be displayed in each product channel. In alternate embodiments, however, there may not be sufficient space for the tray assembly  55100  to extend beyond the rear of the shelf to which it is connected. Thus, in such instances, the tray assembly may be configured as is illustrated in  FIGS. 52A-F  or in the alternate embodiment illustrated in  FIGS. 56A-B  in which the bracket extends beyond the back of the tray assembly  52100  and  56100 , respectively. Again, the second riser  56170  could be integrally formed with the bracket  56180  or it could be fastened thereto as is illustrated in  FIGS. 56A-B . In  FIG. 56B , internally threaded bores are illustrated as being formed in or proximate the legs  56170   a - d  of riser  56170 . 
     In conventional gondola shelving, the shelf and vertical upright to which is connects typically have a gap therebetween which allows sufficient space for placing the rear brackets discussed herein. An example of this gap is illustrated in the conventional shelving unit illustrated in  FIGS. 57A-B , with the shelf identified by reference numeral  5790  and the vertical upright identified by reference numeral  5792 . One problem with having such a gap, however, is that it provides space for the tray assembly to move with respect to the shelving unit (e.g., the shelf itself, the vertical upright, or both). In particular, this gap can result in the tray assembly being movable back and forth laterally (or yaw) as well as pivotally along a horizontal axis (or pitch). In  FIGS. 58A-B , an alternate bracket or bracket attachment is illustrated which helps prevent unwanted movement of the tray assembly  58100  and helps secure the tray assembly  58100  to the shelving unit. In the form illustrated, the bracket  58180  includes a movable spacer plate  58180   g  which is movable toward and away from the bracket  58180 . In practice, this spacer plate may be extended out away from the bracket  58180  to fill the gap illustrated in  FIG. 57B  to prevent such unwanted movement. Once the spacer plate is positioned in the desired position, it can be fastened to bracket  58180  via fasteners  58180   h . In the form illustrated, the spacer plate  58180   g  and bracket  58180  operate as a spreader to spread apart from one another and exert force on the rear edge of the shelf and the forward edge of the vertical upright. 
     Yet another embodiment for securing the rear bracket to the shelving unit is illustrated in  FIGS. 59A-E . In this form, however, the bracket  59180  includes a clamp member  59180   i  and a cam actuator  59180   j  for moving the clamp member  59180   i  between limits of travel. In the form illustrated, the clamp  59180   i  and cam actuator  59180   j  are situated to cause a clamping effect between the upper and lower surfaces of the shelf. Thus, once the rear bracket  59180  is positioned where desired, the cam operator or actuator  59180   j  may be moved to exert a clamping force on the shelf with clamp member or jaw member  59180   i . It should be understood, however, that a similar configuration could be used to cause a clamping force between the rear edge of the shelf and the rear of the tray assembly (instead of the top and bottom surfaces of the shelf). 
     Two additional alternative embodiments of rear brackets are illustrated in  FIGS. 60 and 61 . In  FIG. 60 , the rear bracket  60180  has an alternate mating member  68180   a  that has a plurality of male protrusions that mate with existing female recesses located on the bottom surface of the base of a tray assembly. Thus, instead of bending downward over a wall of the rear of the tray assembly base like with prior embodiments, bracket  68180   a  simply gets inserted into the bottom of the base and forms a riser portion  68180   c , foot portion  68180   d , rear portion  68180   e  and return portion  68180   f . Unlike prior embodiments, however, the return portion  68180   f  is removable and repositionable on the vertical portion  68180   e  so that the return portion  68180   f  can be adjusted to different depths to accommodate shelves of different thickness. This allows the bracket  68180  to be more securely attached to the shelf (or more customizable to the specific shelf it is attached to). In the form illustrated, the return portion  68180   f  mates with the vertical rear portion  68180   e  via a dove-tail configuration (mortise &amp; tenon configuration), but other interlocking arrangements or connectors may be used to form this connection. 
     In  FIG. 61 , the bracket  61180  has a similar mating relationship between the return portion  68180   f  and the vertical rear portion  68180   e , however, in this form, the mating portion  68180   a  takes on a different shape and is preferably configured to slide on from the side of the tray assembly at its rear. In the form illustrated, the mating portion  68180   a  forms a mortis and the rear of the tray assembly will have a corresponding tenon for connecting the bracket  68180  to the tray assembly. 
     In  FIGS. 62A-C , an alternate mechanism for spacing the tray assembly up off of the shelf surface is illustrated using metal support arms very similar to those already used on conventional trays to mount same to bars or grids, however, in the form illustrated, the metal support arms simply perform a riser function and a rear bracket function for securing the tray to the shelving unit. Specifically, a metal blank such as that illustrated in  FIG. 62C  may be formed via stamping, pressing, casting or the like and then bent into the configuration illustrated in  FIGS. 62A-B . Specifically, the structure is formed into an integral structure having left arm  62150   a , right arm  62150   b  and rear bracket  62180 . 
     Alternate riser shapes are illustrated in  FIGS. 64, 65, 66, 67 and 68A -B and  72 . In  FIG. 64 , an alternate bent metal riser is shown and referred to generally as riser  64160 . In alternate forms, this too could be made of molded plastic, if desired. Another metal riser is illustrated in  FIG. 65  and referred to generally as riser  65160 . Unlike prior risers, however, riser  65160  does not define recesses or openings for receiving the mating male projection of the tray assembly base, but rather simply bends distal ends of the riser  65160  back over itself (e.g., upon itself) in order to create a downward facing ledge, shelf or shoulder  65160   h  that the mating male projection can engage to secure the riser  65160  to the base of the tray assembly. As is indicated in  FIG. 65 , this same general design could be produced via a plastic molding process if it is desired to make the riser  65160  out of plastic. Rather than folding the distal ends upon themselves to make ledge  65160   h , however, the mold would simply be designed with this step or ledge in there to form a gripping or engaging surface  65160   h  for the tray assembly&#39;s mating male member to engage. Some benefits to using bent metal as the riser is that it can be formed with sharper corners, such as the one illustrated in  FIG. 66 , and is more resistant to fatigue overtime if the riser is attached and removed from the tray assembly repeatedly over its lifetime (which is not likely). Since any bend can weaken metal at that location, the corner can be reinforced or bolstered via a support such as the buttresses illustrated in  FIG. 67 . However, such a design is better suited for a plastic molded version of the riser if it is determined such support is needed (e.g., due to the weight of the goods to be supported by the tray merchandiser). 
     However, in addition to these alternate riser shapes, another attachment mechanism is illustrated in the embodiment of  FIGS. 68A-B , which has a protrusion  68160   i  extending from one or more of the legs of the riser  68160  which can be used to connect the riser  68160  to a conventional rail structure like that illustrated in  FIGS. 69A-C  in order to secure the riser (and thus the tray assembly) in position on the shelf via the rail. In  FIG. 69A , a conventional retail store gondola upright  69192  and shelf  69190  system are illustrated, showing how such shelving units typically include openings  69190   a  spaced at regular intervals along at least the front and rear boundary of the shelf (normally in a plurality of rows at the front and rear portions of the shelf). The above-mentioned shelf management systems, typically have front and/or rear rails that are connected to the shelf using the front and/or rear holes  69190   a  in the shelving surface, respectively. An enlarged view of the gondola shelving system is shown in  FIG. 69B  and, in the form illustrated, the rail  69194  defines openings  69194   a  that fasteners, such as friction-fit or press-fit pins are inserted into to secure the rail  69194  to the front of the shelf  69190  using the openings  69190   a  that exist in the shelving surface. In other forms, the rail may have projections extending from the bottom surface thereof that are designed to friction-fit or press-fit into the existing openings in the shelf surface (e.g., press-fit dowels, etc.). In still other forms, the rail  69194  may be connected to the shelf via other fasteners, such as adhesive, hook and loop structures, magnets, etc. 
     A benefit of the rail assembly is that the tray assembly may be tilted forward, thereby tilting the riser  69160  forward (see  FIG. 69C ) in order to allow it to be moved laterally within the channel defined by the rail assembly (without full removal from the rail  69194 ) and then rested back down on the shelf  69190  to fully engage the rail assembly  69194  more securely and prevent unintentional lateral movement of the tray assembly. Such a configuration allowing for easy intentional lateral movement of the trays may be desirable for re-planograming a display and/or inserting cut-ins into a display. Additional frictional members, surfaces and/or materials  70194   a ,  71194   a  can be added to the rail as illustrated in  FIGS. 70-71  to further hinder unintentional lateral movement of the tray assembly once connected to rail  71194  (and in particular movement of the riser protrusions  69160   i ,  72160   i  when disposed in the channel of rails  69194 ,  70194 ,  71194 ). Again, such rail systems are used in shelf organization systems, but not with tray merchandisers and further disclosure of such rails can be found in U.S. Patent Application No. 61/910,941 (filed Dec. 2, 2013), Ser. No. 14/558,448 (filed Dec. 2, 2014), Ser. No. 29/510,619 (filed Dec. 1, 2014) and Ser. No. 62/430,227 (filed Dec. 5, 2016) which are all incorporated herein by reference in their entirety. 
       FIG. 72  illustrates an alternate riser  72160  that engages a rail assembly like those discussed above in similar fashion. More particularly, the protrusion  72160   i  extending from the riser  72160  engages with the rail to secure the tray assembly into a desired position on the shelf of a conventional retail store shelving system. In the form illustrated, riser  72160  is formed with gentle curves in order to more easily be molded via a plastic molding process. 
     Thus, it should be understood that the above disclosure illustrates examples of ways in which pull-out tray merchandisers can be mounted to or connected to a shelf without requiring alteration of the tray itself. In some forms, shelf mounting accessories have been disclosed that allow for trays to be retrofitted to mount to a shelf without requiring changes to the tray. In some forms, the shelf mounting accessories include use of a spacer or riser (e.g.,  54160 ,  55160 , etc.). In other forms, the accessories include use of a rear bracket (e.g.,  54180 ,  55180 , etc.). In still other forms, the accessories include use of one or more risers (e.g.,  55160 ,  55170 , etc.). In yet other forms, the accessories include use of one or more of any of the risers (e.g.,  54160 ,  55160 ,  55170 , etc.) or brackets (e.g.,  54180 ,  55180 ,  56180 ,  58180 , etc.). Lastly, alternative mounting members such as metal support arms may be utilized to connect the trays to the shelf. For example, metal support arms such as  62150   a ,  62150   b  may be used that are very similar to the arms used to mount conventional trays to bars and grids, and connect to the trays in the same manner, but having different configurations to provide adequate spacing for the pull-out tray to operate (e.g., sufficient spacing to allow the tray to move from its first or normal retracted position wherein it front faces product on the shelf to a second extended position where the tray extends from the shelf to make it easier to stock or re-stock the tray with product. 
       FIG. 73A  illustrates a product display  73000  having a pair of tray assemblies  73100   a ,  73100   b . Each tray assembly  73100   a ,  73100   b  includes one or more engagement portions  73160 . As shown in  FIGS. 73B-73D , the engagement portions  73160  includes protrusions  73160   i . The protrusions  73160   i  are sized and configured to be received within the channel of a rail  73194 . The engagement portions  73160  frictionally engage the rail  73194  so as to restrict lateral movement of the tray assemblies  73100   a ,  73100   b  along the longitudinal axis of the rail  73194 . 
     The tray assembly  73100   a  includes a pair of sidewalls  73122   a ,  73122   b . The sidewalls  73122   a ,  73122   b  are solid plastic. The sidewalls  73122   a ,  73122   b  along with the product support surface  73123   a  of the tray  73120   a  form a product channel in which products are displayed. One or both of the sidewalls  73122   a ,  73122   b  are movable between a first retracted position (as shown) and a second extended position relative to the product support surface  73123   a . Moving one or both of the sidewalls  73122   a ,  73122   b  to the extended position widens the area in which products are displayed in order to accommodate products of different sizes. In some forms, the sidewalls  73122   a ,  73122   b  are infinitely adjustable between the full extended and fully retracted position in order to accommodate a wide variety of product sizes. 
     A spring biased pusher  73130  urges products resting on the product support surface  73123   a  forward towards the front end of the tray assembly  73100   a . A lens  73140  is positioned proximate the front end of the tray assembly  73100   a  to act as a product stop to prevent the pusher  73130  from pushing products off of the tray assembly  73100   a . In some forms, the tray assembly  73100   a  includes locking structure for releasably locking the pusher  73130  in a position proximate the rear end of the tray assembly  73100   a . Locking the pusher  73130  aids in restocking of the tray assembly  73100   a . A pusher release is used to unlock the pusher  73130 . In some forms, the pusher release includes an actuated positioned proximate the front end of the tray assembly  73100   a.    
     Similarly, the tray assembly  73100   b  includes a pair of sidewalls  73122   c ,  73122   d  and a product support surface  73123   b  of the tray  73120   b  that form a channel in which products are displayed. A spring biased pusher  73130  is used to face products within the channel towards a lens  73140 . The sidewalls  73122   c ,  73122   d  are wireframe. One or both of the sidewalls  73122   c ,  73122   d  are movable between a first retracted position (as shown) and a second extended position relative to the product support surface  73123   b . Moving one or both of the sidewalls  73122   c ,  73122   d  to the extended position widens the area in which products are displayed in order to accommodate products of different sizes. In some forms, the sidewalls  73122   c ,  73122   d  are infinitely adjustable between the full extended and fully retracted position in order to accommodate a wide variety of product sizes. 
     The tray assemblies  73100   a ,  73100   b  are rotatable about the engagement portions  73160  between a first, secured position (see tray assembly  73100   b ) and a second, released position (see tray assembly  73100   a ). In both positions, the protrusions  73160   i  extend at least partially into the channel of the rail  73194 . In the secured position, the engagement portion  73160  engages the rail  73194  so as to restrict movement therein, as shown in  FIG. 73B . The rail  73194  is engaged by the protrusions  73160   i  as well as a rearward facing surface  73160   b , which is defined within a notch on the underside of the engagement portion  73160 , rearward of the protrusions  73160   i . The insertion portion  73160   a  of the engagement portion  73160  is sized to tightly fit between the nose  73194   b  and a forward facing surface of the rear wall  73194   c  of the channel of the rail  73194  so as to frictionally engage each. As described above, one or both of the rail  73194  and engagement portion  73160  may have high friction materials to further restrict relative movement. 
     In the released position, the rear end of the tray assembly  73100   a  is pivoted upward such that the surface  73160   b  no longer engages the wall  73194   c . This enables the protrusion  73160   i  to separate from the nose  73194   b  so that the tray assembly  73100   a  can be moved laterally along the longitudinal axis of the rail  73194 . The tray assemblies  73100   a ,  73100   b  are infinitely adjustable along the length of the rail  73194  allowing the planogram of the product display  73000  to be continuously adjusted to fit different combinations of products. 
     The rail  73194  includes a plate portion  73194   p  that extends rearward of the wall  73194   c . The plate portion  73194   p  extends along at least a portion of the length of the tray assemblies  73100   a ,  73100   b . In one form, the plate portion  73194   p  has a depth giving the rail  73194  a total depth of between 8 inches and 24 inches. The plate portion  73194   p  includes interlocking members  73195   a ,  73195   b  for coupling a plurality of adjacent rails  73194 . When a plurality of rail sections  73194  are positioned along the length of a shelf, the interlocking members  73195   a ,  73195   b  align adjacent rails  73194  such that the channel portions line up to form one continuous channel. As shown in  FIGS. 76A-76C  and described below, the plate portion  73194   p  includes a rear stabilizer. The rear stabilizer includes one or more recesses or apertures into which a projection or protrusion of the tray assemblies  73100   a ,  73100   b  is received when the tray assemblies  73100   a ,  73100   b  is in a secured position. The cooperation of the rear stabilizer with the protrusion restricts lateral movement of the rear end of the tray assemblies  73100   a ,  73100   b  relative to the front ends thereof, keeping the tray assemblies  73100   a ,  73100   b  straight. The rail  73194  includes structure for coupling to the top surface of a shelf. Exemplary structure includes adhesive, adhesive strips, high friction materials, magnets, apertures for receiving bolts, screws, or lugs, clamps, or combinations thereof. 
     In some forms, the tray assemblies  73100   a ,  73100   b  are extendable to aid in restocking. To extend, the product support surface  73123   a ,  73123   b  slides forward relative to the engagement portions  73160  from a retracted, display position (as shown) to an extended stocking position. In some forms, the tray assemblies  73100   a ,  73100   b  may include a tray actuator or release button, such as the release button  52120   a  described above. Alternatively or additionally, the product support surfaces  73123   a ,  73123   b  may be rotatable about a vertical axis relative to the engagement portion  73160 . Rotating the product support surfaces provides side access or rear access to the product display channel during restocking. 
     In  FIGS. 73A-73D , the engagement portions  73160  are separate components from the trays  73120   a ,  73120   b . The engagement portions  73160  are optional or auxiliary components of the tray assemblies  73100   a ,  73100   b . As such, the same trays  73120   a ,  73120   b  can be utilized in a plurality of tray assemblies configured to attach to different types of shelf units. The engagement portions  73160  are attached to the trays  73120   a ,  73120   b  configured to attach to the top surface of a shelf. The engagement portion  73160  includes one or more protrusions configured to be received within recesses or apertures in the trays  73120   a ,  73120   b  and/or lens  73140 . In a preferred form, the protrusions form a snap fit with the trays  73120   a ,  73120   b . Alternatively or additionally, the engagement portion  73160  includes one or more recesses or apertures configured to receive protrusions of the trays  73120   a ,  73120   b  and/or lens  73140 . In some forms, the attachment is detachable. Alternatively, once attached the engagement portion  73160  cannot be detached from the tray assemblies  73100   a ,  73100   b  without breaking the engagement portion  73160 , tray  73120   a/b , or lens  73140 . The attachment structure of the engagement portion  73160  may be configured to cooperate with structure of existing trays or lenses so as to retrofit existing tray assemblies for mounting to shelf top rails  73194 . 
     In alternative embodiments, the engagement portion is integral with at least one of the tray and the lens.  FIG. 74  illustrates a tray assembly  74100  having an integral engagement portion  74160 . The engagement portion  74160  includes a forward protrusion  74160   i  sized and configured to be received within a rail, such as the rail  73194  described above. The tray assembly  74100  further includes a pair of opposing sidewalls  74122   a ,  74122   b  and a tray  74120  having a product support surface  74123 . The sidewalls  74122   a ,  74122   b  and product support surface  74123  define a channel in which products are displayed. A pusher  74130  is spring biased to face products towards a front lens  74140 . 
     In some forms, one or both sidewalls  74122   a ,  74122   b  are infinitely adjustable relative to the tray  74120  between a fully retracted position and a fully extended position to adjust the width of the product display channel. 
       FIG. 75  illustrates a product display  75000  having a product support  75123  having an integral engagement portion  75160  and a separate divider  75122  having an integral engagement portion  75160 . The engagement portions  75160  are substantially similar to the engagement portions described above, having a protrusion  75160   i  sized and configured to be received in and engage with a shelf top rail. The divider  75122  includes a pair of product support surfaces  75122   b ,  75122   c  disposed on either side of a wall  75122   a . Products span the distance between the support surface  75122   c  and the product support  75123  so as to be supported by both. The divider  75122  is movable independently of the product support  75123  so as to infinitely adjust the width of the product channel formed thereby. The product support  75123  includes an integral pusher track  75123   a  along which a spring biased pusher  75130  travels. The product support  75123  and divider  75122  each have a downward protrusion (not shown) configured to cooperate with the rear stabilizer of the rail. 
       FIGS. 76A-76E  illustrate a product display  76000 . The product display  76000  includes a tray assembly  76100  having a tray  76120  with a product display surface  76123 . The tray  76120  is configured to receive a pair of opposing sidewalls and a spring biased pusher, such as those shown above. The sidewalls and pusher have been removed from this embodiment to more clearly show the attachment structure between the tray  76120 , lens  76140 , and engagement portion  76160 . 
     The product display  76000  further includes a rail  76194 . The rail  76194  includes a front channel defined by a front nose  76194   b  and wall  76194   c . A plate portion  76194   p  with interlocking members  76195   b ,  76195   a  extends rearward from the wall  76194   c . Proximate the rear end of the rail  76194  is a rear stabilizer  76196 . The rear stabilizer  76196  comprises a plurality of slots  76196   a  configured to receive downward protrusions of the tray  76120 . The rail  76194  has a depth of at least half the depth of the tray  76120 . In some forms, the rail  79194  has a depth of between 8 inches and 24 inches. In a preferred form, the downward protrusion of the tray  76120  is detachable from or movable relative to the tray  76120  such that trays  76120  can be used with rails  76194  of different depths. Alternatively, the protrusion is a set distance from the front end of the tray  76120  such that trays of different lengths are each configured to couple to the same rail  76194 . As such, one tray  76194  is usable with a plurality of different depth shelves. 
     The engagement portion  76160  includes an insertion portion  76160   a  having a forward protrusion  76160   i . The insertion portion  76160   a  is sized and configured to be received within the channel of the rail  76194  with the protrusion  76160   i  being received within the nose  76194   b.    
     The lens  76140 , engagement portion  76160 , and tray  76120  are configured to detachably couple via snap fit connections. As shown in  FIGS. 76B-76C , the lens has one or more rearward extending projections  76142  and one or more downward extending projections  76144 . The rearward projections  76142  have a rounded bottom surface  76142   a . The downward extending projections  76144  have an arrow shaped or barb shaped end  76144   a . The engagement portion  76160  has one or more upward and forward opening apertures  76166  sized and configured to receive the rearward extending projections  76142 . The engagement portion  76160  further includes one or more upward opening apertures  76168  sized and configured to receive the downward extending projections  76144 . 
     In operation, the lens  76140  is tilted or rotated backwards (the top of the lens  76140  is moved rearward relative to the bottom of the lens  76140 ). With the lens  76140  tilted, the rearward extending projections  76142  are inserted into the corresponding apertures  76166  of the engagement portion. The lens  76140  is then rotated forward about the rearward extending projections  76142 , which causes the downward extending projections  76144  to be inserted into the apertures  76168 . During insertion, the angled or cam surface of the arrow shaped ends  76144   a  cooperate with the structure of the engagement portion  76160  defining the apertures  76168  which causes the downward extending projections  76144  to deform. When fully inserted, the arrow shaped ends  76144   a  have passed fully through the apertures  76168 , enabling them to resiliently return to their non-deformed shape. The arrow shaped ends  76144   a  and the adjacent portion of the engagement portion  76160  form a snap lock or interference lock securing the lens  76140  in position relative to the engagement portion  76160 . In order to decouple the lens  76140  from the engagement portion  76160 , the downward extending projections  76144  must be deformed out of interference with the engagement portion  76160  such that the lens can be rotated backward to reverse the process described above. 
     Similarly, the engagement portion  76160  includes one or more rearward extending projections  76162  and one or more downward extending projections  76164 . The rearward projections  76162  have a rounded bottom surface  76162   a . The downward extending projections  76164  have an arrow shaped or barb shaped end  76164   a . The tray  76120  has one or more upward and/or forward opening apertures  76126  sized and configured to receive the rearward extending projections  76162 . The tray  76120  further includes one or more upward opening apertures  76128  sized and configured to receive the downward extending projections  76164 . 
     In operation, the engagement portion  76160  is tilted or rotated backwards. With the engagement portion  76160  tilted, the rearward extending projections  76162  are inserted into the corresponding apertures  76126  of the tray  76120 . The engagement portion  76160  is then rotated forward about the rearward extending projections  76162 , which causes the downward extending projections  76164  to be inserted into the apertures  76128 . During insertion, the angled or cam surface of the arrow shaped ends  76164   a  cooperate with the structure of the tray  76120  defining the apertures  76128  which causes the downward extending projections  76164  to deform. When fully inserted, the arrow shaped ends  76164   a  have passed fully through the apertures  76128 , enabling them to resiliently return to their non-deformed shape. The arrow shaped ends  76164   a  and the adjacent portion of the tray  76120  form a snap lock or interference lock securing the engagement portion  76160  in position relative to the tray  76120 . In order to decouple the engagement portion  76160  from the tray  76120 , the downward extending projections  76164  must be deformed out of interference with the tray  76120  such that the engagement portion can be rotated backward to reverse the process described above. 
     While  FIGS. 76A-76E  illustrate a display in which projections of the lens are inserted into the engagement portion and projections of the engagement portion are inserted into the tray, it is understood that other orders are also considered. For example, the lens and engagement portion may each have projections similar to those described above which are inserted into corresponding apertures in the tray. Alternatively, the position of the apertures and projections may be reversed such that the tray has projections that are inserted into the engagement portion which in turn has projections that are inserted into the lens. In still further alternatives, two structures (such as the engagement portion and tray) are attached to each other using projections on each structure which are inserted into corresponding apertures in the other. 
     In one example, a tray accessory  76000  for mounting a tray  76120  to a shelf comprises a first mount  76160  to connect the tray  76120  to a shelf, the first mount having a first mating structure  76162 / 76164  for mating the first mount  76160  to at least a portion of the tray at a front or forward portion of the tray  76120 , and a second mating structure  76160   a  for mating the first mount  76160  to the shelf at a front or forward portion of the shelf. 
     The first mating structure  76162 / 76164  connects onto or is inserted into the front or forward portion of the tray  76120 , and the second mating  76160   a  structure comprises a protrusion  76160   i  for mating with a corresponding structure  76194  on the front or forward portion of the shelf. 
     The second mating structure  76160   a  indirectly mates the first mount  76160  to the shelf via an interconnecting member  76194 . 
     The interconnecting member  76194  includes a rail or channel that the protrusion  76160   i  of the second mating structure connects to. 
     The interconnecting member  76194  forms a base that may be fastened to the shelf via a fastener including at least one of an adhesive, magnet, pin, bolt, screw or rivet, and the rail or channel formed by the interconnecting member forms an uninterrupted rail or channel that allows for continuous adjustment of the second mating structure along the rail or channel to allow for unlimited positioning over that span. 
     In some forms, there is a second mount to connect the tray to the shelf, the second mount having a third mating structure for mating the second mount to at least a portion of the tray at a side or intermediate portion of the tray, and a fourth mating structure for mating the second mount to the shelf at an intermediate portion of the shelf. As described above, in one form the second mount comprises a structure configured to movably or removably couple to the bottom of the tray. The structure has a downward protrusion for cooperating with the stabilizer  76196 . 
     The fourth mating structure indirectly mates the second mount to the shelf via the interconnecting member  76194  and the interconnecting member  76194  defines a fifth mating structure  76196  that mates with the fourth mating structure to connect the tray to the shelf. 
       FIGS. 73A-76E  disclose trays having a single product channel. It is understood that the engagement portions described therein can be used with any of the trays described above in the application, such as the tray  100  which has a plurality of product channels. 
     The pushers described herein are shown as one piece, vertical planes. In alternative embodiments, the pushers include one or more additional portions which are detachable from or movable relative to the pushers to adjust the size of the pushing surface. In some forms, the pusher extends rearward from its engagement point with the tray so as to increase the depth of the product display channel when the pusher is in its rearward most position. 
     In some embodiments, the lenses described herein are illuminated to better highlight the products being displayed. Alternatively or additionally, the product displays may include indicators, such as mechanical indicators or electrical indicators like lights, for alerting a user when restocking is required. 
     One advantage to the retrofit structures used herein is that they can connect to existing structures either on the trays themselves (e.g., mating male member  54110   a ,  55110   a , etc.) and/or on the shelves themselves (e.g., shelf openings  69190   a , rails  69194 , etc.). Some of the accessories further may be customized or adjusted to fit specific shelves. For example, adjustable brackets  58180 ,  59180 ,  60180 ,  61180  may all be adjusted to better fit the shelf mounting accessory and tray assembly to a specific shelving unit. This may mean the brackets are adjustable in height, width, depth and may further mean they exert some form of force on the neighboring structures (e.g., shelf, upright, etc.) in order to secure the tray assembly to the shelf. For example, in some forms clamping forces are used to secure the tray assembly to the shelf, while in other forms, spreading forces are used to secure the tray assembly to the shelf. In some instances, a spacing bracket is used to exert a spreading force and/or to fill a gap between the rear of the shelf and the neighboring upright. In other instances, a cam lever may be operated to exert a clamping force to secure the bracket and tray assembly to a shelving unit. 
     Thus, both active and passing connectivity is disclosed herein. Passive connectivity may be utilized by supplying a rigid bracket that simply loops or hooks around the rear of the shelf. Other passive connectivity forms may include the use of projections or protrusions (e.g., dowels, bench dog, etc.) from the risers, brackets or support arms to simply engage existing structure on the shelves, such as the existing shelf openings or holes. Conversely, active connectivity may be used by employing the spreader or clamping mechanisms discussed herein, or adding a rail system to the shelf to use such a feature to help connect one or more tray assemblies to the shelf. The active connectivity solutions may be configured to secure the tray assembly or portions thereof (e.g., bracket, riser, etc.) to a shelf in any of the x, y or z directions (e.g., a vertical clamp, horizontal clamp, vertical spreader, horizontal spreader, etc.). In addition, one or more of any of these points of connection may be used to connect the tray assembly to the shelf (e.g., passive only, active only, a combination of both passive and active, etc.). Thus, this may include simple insertion of dowels in one area of the tray assembly and assertion of clamping and/or spreading forces in another area of the tray assembly. In addition, use of features such as a rail connection may further allow for more functionality with respect to the trays, such as the ability to perform intentional lateral movement of same for adjustments of the display planogram (e.g., initial setup, replanogram, cut-ins, etc.), and yet still hinder unintentional movement during use or operation of the tray merchandiser. 
     The embodiments disclosed herein further provide examples for mounting trays to shelving systems using single and multiple points of connection. For example, metal support bars may be used with a rear bracket that offers a single point of connection to the shelf (single point connectivity). Other embodiments use two point connectivity, such as by using a riser and a rear bracket, two risers, or a riser and an integral riser and rear bracket. Yet other embodiments may use multi-point connectivity such as by using multiple risers and a rear bracket or other examples in which an adjustable rear bracket may be used to provide itself multiple points of connectivity. In yet other forms, the trays disclosed herein may be integrated with one or more of these features to make them a shelf-mounted specific tray (for example, if it is desired to offer two distinct tray product lines with one targeting shelf-mounted applications and the other targeting bar/grid/upright applications). 
     This detailed description refers to specific examples in the drawings and illustrations. These examples are described in sufficient detail to enable those skilled in the art to practice the inventive subject matter. These examples also serve to illustrate how the inventive subject matter can be applied to various purposes or embodiments. Other embodiments are included within the inventive subject matter, as logical, mechanical, electrical, and other changes can be made to the example embodiments described herein. Features of various embodiments described herein, however essential to the example embodiments in which they are incorporated, do not limit the inventive subject matter as a whole, and any reference to the invention, its elements, operation, and application are not limiting as a whole, but serve only to define these example embodiments. This detailed description does not, therefore, limit embodiments of the invention, which are defined only by the appended claims. Each of the embodiments described herein are contemplated as falling within the inventive subject matter, which is set forth in the following claims. It is understood that the features of each of the embodiments described herein can be interchanged and/or combined. For example, the product display of  FIGS. 76A-76E  may include features of the tray of  FIGS. 1A-1M .