Abstract:
A method and apparatus of feeding containers on a pusher track includes these steps. Push a pusher back before the tray is loaded. Latch the pusher at a back end of the pusher track, by catching a pusher guide in a horizontal notch in an edge of the track. Load a backmost container. Load further containers, and thereby push the backmost container towards the pusher, and automatically unlatch the pusher. Push the backmost container against a more forwardly rotated sidewall of the pusher, thereby horizontally rotating the pusher slider out of the notch, and unlatching the pusher, to push the containers forward.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a utility patent application claiming benefit and priority from Provisional Patent Application 61/931,529 filed: 24 Jan. 2014, entitled: Display Assembly Inventor Name: Samuel Kim hung Ng. The present application was filed on the next business day, Monday 26 Jan. 2015, following the 12 months elapsing on Saturday 24 Jan. 2015, and is entitled to said benefit under 35 USC sec. 119(e); this present utility patent application is also a Continuation-In-Part claiming benefit and priority from copending Utility patent application Ser. No. 14/604,631, filed 23 Jan. 2015; which claims benefit and priority from Provisional Patent Application 61/931,529 filed: 24 Jan. 2014; both entitled: Display Assembly, Inventor Name: Samuel Kim hung Ng. 
     That Utility patent application Ser. No. 14/604,631 and Provisional Application 61/931,529 are incorporated by reference herein. 
     The present invention provides one or more display assemblies comprising a pusher track. The pusher is pushed back before the tray is loaded. The pusher latches. When the lower level of the tray is fully loaded, the container automatically unlatches the pusher. 
    
    
     BRIEF DESCRIPTION 
       FIG. 1  is an oblique view which shows a pusher tray of a display assembly of the present invention. 
       FIG. 1A  is a side elevation in section thereof. 
       FIG. 2  is an exploded oblique view thereof. 
       FIG. 3  is a side elevation thereof. 
       FIG. 4  is a plan view of a plurality of trays assembled together, with product packaging thereon. 
       FIG. 4A  is a side elevation thereof. 
       FIG. 5  is an oblique view thereof. 
       FIG. 5A  is a front elevation thereof. 
       FIG. 6  is a front elevation in section thereof. 
       FIG. 6A  is a side elevation in section thereof. 
       FIG. 7  is an oblique lower rear view of a pusher. 
       FIG. 7A  is an oblique upper front view of the pusher. 
       FIG. 8A  is a side elevation of the pusher. 
       FIG. 8B  is a front elevation of the pusher. 
       FIG. 8C  is a top plan view of the pusher. 
       FIG. 9A  is a side elevation in section of the pusher. 
       FIG. 9B  is a rear elevation of the pusher. 
       FIG. 9C  is a bottom plan view of the pusher. 
       FIG. 10  is a side elevation in section of the tray, sans pusher. 
       FIG. 11  is a top plan view of the tray. 
       FIG. 12  is a front elevation of the tray. 
       FIG. 13  is an oblique upper front view of the tray. 
       FIG. 14  is an oblique lower front view of the tray. 
       FIG. 15  is a bottom plan view of the tray. 
       FIG. 16  is a top plan view of the tray. 
       FIG. 17  is a detail circled in  FIG. 16 . 
       FIG. 18  is a front elevation of the pusher, assembled to the tray shown in section. 
       FIG. 19  is a rear view of a taller pusher, rising 6 inches above the track surface. 
       FIG. 20  is an upper front oblique view thereof. 
       FIG. 21  is a top plan view thereof. 
       FIG. 22  is a front elevation thereof. 
       FIG. 22A  is a side view in section through the center plane A-A of  FIG. 22 . 
       FIG. 23  is a bottom plan view of the taller pusher. 
       FIG. 24  is a side elevation of the taller pusher. 
       FIG. 25  is a lower rear oblique view thereof. 
       FIG. 26  is a rear view of a side fence. 
       FIG. 27  is a side elevation of the side fence. 
       FIG. 27A  is a front elevation, in section, through plane A-A of  FIG. 27 . 
       FIG. 27B  is a detail of circle B shown in  FIG. 27A . 
       FIG. 28  is an upper front oblique view thereof. 
       FIG. 29  is a bottom plan view of the side fence. 
       FIG. 30  is a top plan view thereof. 
       FIG. 31  is a lower rear oblique view thereof. 
       FIG. 32  is a front elevation of the presently preferred track. 
       FIG. 33  is a top plan view thereof. 
       FIG. 33A  is a side elevation in section through plane E-E of  FIG. 33 . 
       FIG. 33B  is a side elevation in section through plane B-B of  FIG. 33 . 
       FIG. 34  is a bottom plan view of the presently preferred track. 
       FIG. 35  is a side elevation presently preferred track. 
       FIG. 35A  is a front elevation in section through plane C-C of  FIG. 35 . 
       FIG. 35B  is a front elevation in section through plane F-F of  FIG. 35 . 
       FIG. 36  is an upper front oblique view thereof. 
       FIG. 37  is a lower front oblique view thereof. 
       FIG. 38  is a top plan view of the presently preferred track, and a bottom plan view of two side fences. 
       FIG. 39A  is an exploded front elevation, in section, of two presently preferred tracks, interlocked adjacent each other; with a fence positioned above their adjacent sidewalls, the dotted line to the fence&#39;s mounting position. 
       FIG. 39B  is a front elevation, in section, of said two presently preferred tracks, interlocked adjacent each other; with the fence mounted atop the tracks&#39; adjacent sidewalls. 
       FIG. 40  is a front elevation, in section, of a presently preferred track, with the fence mounted atop one sidewall of the track. 
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is an oblique view which shows a display assembly of the present invention, generally designated  5 . 
     A pusher  7  slides within a pusher track  8 . 
       FIG. 1A  shows a variable tension spring  9 , a coil part of which  10  is coiled behind pusher  7 , and stretched part of which is stretched out along and underneath a slot  12 , in a floor  13 , as shown in  FIG. 11 .  FIG. 1A  also shows a plurality of recesses  14 . 
     As shown in  FIG. 5 , a plurality of these display assemblies  5  may be placed alongside each other on a standard wire shelf  17 . Such wire shelves  17  generally have an upward protruding wire  19 . In this embodiment the forward most of recesses  14  is designed to fittingly receive wire  19  and thereby accurately register each pusher track  8  properly on wire shelf  17 . On differently sized wire shelves the other recesses  14  may be used with various front wire locations, as would provide the best fit. 
       FIG. 2  is a view similar to  FIG. 1 , but exploded to better show the parts of the assembly  5  including:
         pusher  7 ;   pusher track  8 ; and variable   tension spring  9 , including:
           coil  10 , and   elongated portion  11 .   
               

     The tendency of the spring is for the spring  9  to be biased to coil, so that the elongated part  11  wants to roll itself up into coil  10 , and thereby push pusher  7  frontward, along with any product residing within pusher track  8 . 
     A spring latch  21  biases upward at its back surface  22  toward the bottom of pusher  7 . Spring latch  21  smoothly hinges at its front  23  with floor surface  24  so that it may be depressed flush with said floor by pushing backwards on pusher  7 , which pushes past the entire hinge  23  and spring latch  21  and back end  22 , until pusher  7  is stopped by back surface  25  of the assembly  5 . Once latch  21  is released, spring  9  pushes latch  21  against bottom pad  26 , shown in  FIG. 2 , on the front surface  27 . Pusher  7  is stopped by back surface  22  of spring latch  21 . There is a corresponding spring latch on the opposite side of the assembly  5 , which cooperatively does the same thing. 
     A fixed vertical tab  40  depends from bottom of the assembly  5  toward assembly  5 &#39;s back  25 . Tab  40  serves, along with a second similar tab  41 , shown in  FIG. 3 , to firmly locate assembly  5  between fore-and-aft wires such as wire  47  of wire shelf  17  as shown in  FIG. 5 . 
       FIG. 4  is a plan view of seven of the assemblies  5  sitting on wire shelf  17 . Each assembly  5  is filled with a product  50  which is well-adapted to be displayed on assembly  5 , product  50  being, in this case, one-pint containers  50  of ice cream. 
       FIG. 4A  is a side elevation of  FIG. 4  showing a lower rank  51  of containers  50  and an upper rank  52  of containers  50 . 
     When the bottom back container  53  is placed at the back of the assembly  5 , container  53 &#39;s bottom surface or edge  70  ( FIG. 6A ) depresses spring latch or latch  21 , clearing it from impeding pusher  7  and pushing back the top of pusher  7  to further lift the bottom pad  26  ( FIG. 2 ) clear of the back surface  22  ( FIG. 6A ) of latch  21 , as shown in  FIG. 2  and  FIG. 6A . This releases pusher  7  to push product forward, towards the customers. 
     In  FIG. 4A , front recess  14  of assembly  5  cooperates with front wire  19  of wire shelf  17 , to firmly locate assembly  5  fore-and-aft on shelf  17 . 
       FIG. 6  is a front elevation, showing a wire shelf  17  containing seven assemblies  5 .  FIG. 6  is sectioned through the centers of a rank of containers  50 , such as through plane  6  of  FIG. 4 . 
       FIG. 6A  is a side elevation thereof sectioned through the centers of a file of containers  50 , such as plane  6 A of  FIG. 4 . Bottom rim  70  of container  51  depresses rear surface  22  of latch  21 ; and an upper surface  70 A, of the conical pint container wall  71 , pushes against the top  75  of pusher  7 , to lift bottom pad  26  further clear of rear surface  22  of latch  21 . This releases pusher  7 , so that its spring  9  pushes against the side of containers  50 , and containers  50  are pushed as each forward bottom container  85  is removed by a customer. Pusher  7  pushes bottom  51  and top levels  52  of containers  50  forward, to be more easily reached by the customer. 
       FIG. 7  is a lower rear side oblique view of pusher  7 , showing buttresses  87 , which also form a compartment  88  for coil  10 . An angled surface  89  helps to feed coil  10  into compartment  88 . Guides  91 - 92  hook under tracks  24  to guide pusher  7  along the tracks  24 . Shelves  97  help orient pusher  7  in the vertical plane. 
       FIG. 7A  is an oblique upper front side view of pusher  7 . Sidewalls  94 - 95  center the pint walls against front surface  27 . Buttresses  87  also form a compartment  88  for coil  10 . An angled surface  89  helps feed coil  10  into compartment  88 , where coil  10  is retained. Guides  91 - 92  hook under tracks  24  to guide pusher  7  along the tracks  24 . 
       FIG. 8A  is a side elevation of said pusher  7 , sectioned through its center plane. Coil compartment  88  is defined on its bottom by bottom shelf  100 , which retains the coil in coil compartment  88 . 
       FIG. 8B  is a front elevation thereof. 
       FIG. 8C  is a top plan view thereof. 
       FIG. 9A  is a side elevation thereof. 
       FIG. 9B  is a rear elevation thereof. 
       FIG. 9C  is a bottom plan view thereof. 
       FIG. 10  is a side elevation in section through the center of track  8 . Spring-biased hinge  23  may comprise a metal spring, not shown, or it may simply be formed by an appropriately flexible plastic at that point. Product display window  110  is shown. Front pylon  111  helps locate containers at the front of track  8 , and limits their forward travel response to spring  9  and pusher  7 . Curved inner surface  113  of pylon  111  is cooperatively shaped to match the conical outer wall  71  of the ice cream containers  50 . 
       FIG. 11  is a top plan view thereof showing:
         product information display window  110 , and   both front pylons  111  and  112 , with their cooperatively curved inner surfaces  113 .       

     Spring slot  12  is shown. 
       FIG. 12  is a front elevation of track  8  showing: locating tabs  40  and  41 , product information window  110 , and front pylons  111  and  112 . 
       FIG. 13  is a top oblique side view of track  8  showing how ramp  21  is not attached to lower step  120  as is floor  24 , as can be seen by observing opening  121  under ramp  21 . 
       FIG. 14  is a bottom front side oblique view of track  8 . 
       FIG. 15  is a bottom plan view thereof. 
       FIG. 16  is an alternate embodiment of the track, generally designated  118 . Instead of the ramp  21  of  FIG. 13 , the  FIG. 16  embodiment has a solid notch in the end of the track and angles the last 1.139 inches. This is shown in the encircled detail at the rear end of the track, labeled  FIG. 17  detail and shown in  FIG. 17 . 
       FIG. 17  shows this detail. Near the end of the track  212 , at the beginning  214  of the last 1.139 inches of the track, one track edge  216  angles the last 1.139 inches in a straight line away from the centerline  217  of the slot  212 . The other track edge  219  makes a stepwise notch  221 , and then angles the last 1.139 inches in the straight line  225  back toward the centerline  217 , and parallel to edge  216 . But the outer edges of guides  391  and  392  engage with their respective track edges,  392  with edge  216 , and  391  track edge  219 . 
       FIG. 18  shows a pusher  307  designed to work with this notch. There is no longer need for the bumps  26  of  FIGS. 2, 8B, and 8C . So, front surface  327  is clean and flat, except for guide walls  394  and  395 . When pusher  327  is pushed back, particularly if it is pushed on its wall  395  side, its guide  391  is rotated, and so drops into step  221 , to stop pusher  307 &#39;s motion forward, thus locking the pusher  307  at the back of the slot  212 . This conveniently keeps pusher  307  from interfering with loading of product onto display assembly  325 , as with the previous embodiment. When a product container  50  pushes against the wall  394  side of pusher face  327 , pusher  307 :
         straightens,   disengages guide leg  391  from step  221 , and   allows the pusher  307  to push the product forward on the track toward the customer as other product is removed.       

     It is thought that this arrangement will work more reliably than the previously shown spring-loaded ramps. 
     New text and drawings have been added to describe further improvements, made since filing the Provisional Application, and described below. 
       FIG. 19  is a rear view of a taller pusher  400 , rising over 6 inches, 6.121″, above the track surface on which sliding surface  402  rests. 
       FIG. 20  is an upper front oblique view of pusher  400 . Sidewalls  404 - 405  center the pint walls against front surface  407 . Upper sidewall portions  404 A- 405 A of said sidewalls  404 - 405 , form a notch for receiving the edge of the cylindrical lid  629  of the container  50  ( FIGS. 4, 4A , &amp;  5 A). This presently preferred embodiment of the invention is particularly suited for pushing Pint ice cream containers  50 , such as those currently used by Ben &amp; Jerry&#39;s® ice cream. 
     Upper sidewall portions  404 A- 405 A of said sidewalls  404 - 405  ( FIG. 19 ), form a notch which is slightly more closely spaced to the cylindrical lid  629  than the lower portions of said sidewalls  404 - 405  are to the semi-conical pint wall  629 A. This directs more of the pusher force to the lid  629 , than to the more-easily-crushed container  50 &#39;s sidewall  629 A ( FIGS. 4, 4A , &amp;  5 A). 
     Upper sidewalls  408 - 409  protrude forward, so that they engage packages, such as packages shown in  FIGS. 4-6A , the backmost package  71  of an upper tier  52  of containers, near the package&#39;s bottom. 
     When a last container is loaded onto the tray, the container pushes upper sidewalls  408 - 409  backwards, which rotates pusher  400  to release sliders  410 - 411  from a horizontal notch  421  ( FIG. 33 ) in the track edge  423 . Each slider  410 - 411  has a horizontal hook  424  to retain the pusher to its track. 
       FIG. 21  is a top plan view of taller pusher  400 . Buttresses  427  form a compartment  428  for retractor coil such as coil  10  shown in  FIG. 2 . 
       FIG. 22  is a front elevation of taller pusher  400 . The 0.244 inch vertical spacing between sliding surface  402  and hooks  424  allows a lower profile track, which saves vertical space in the display. 
       FIG. 22A  is a side view in-section through center plane A-A of  FIG. 22 . Coil compartment  428  is defined on its bottom by bottom shelf  429 , which retains the coil in coil compartment  428 . Coil  10  uncoils through opening  432  through front surface  407 . Wall  435  is shown in section between back surface  437  and front surface  407 . Buttress  439  stiffens wall  437 . See also  FIGS. 21 &amp; 22 &amp; 24  for buttress  439 . Front surface  402  makes an 85 degree angle to sliding surface  402 . 
       FIG. 23  is a bottom plan view of the taller pusher. 
       FIG. 24  is a side elevation of the taller pusher. 
       FIG. 25  is a lower rear oblique view tall pusher  400  showing buttresses  427 , which also form a compartment  428  for coil  10 . Guide sliders  410 - 411  hook  424  under the tracks to guide pusher  400  along the tracks. 
       FIG. 26  is a rear view of an extended side divider or fence  500 . This can snap onto an upper side wall surface of the improved tray assembly of  FIGS. 33-37 . 
     As shown in  FIG. 29  inverted Ts  501 - 504 , and tab  505  serve to locate and to secure bases  506  to a top of a sidewall of the tray assembly. 
       FIG. 27  is a side elevation of side divider  500 . Openings  508  are reinforced by thicker frames  510 . The Openings  508  conserve material and provide handles for manipulating the side divider  500 . Frames  510  reinforce Openings  508  and spread load on manipulating hands. 
     Side divider  500  has feet  520 . Each foot  520  comprises a locating tab  505 ; a base  506 ; and inverted Ts  501 - 504 . Inverted Ts  501 - 502  are shown in  FIG. 27A , and detailed in  FIG. 27B . 
       FIG. 27A  is a front elevation of wall or fence  500 , in section, through plane A-A of  FIG. 27 , showing inverted Ts  501 - 502 . 
       FIG. 27B  is a detail of circle B shown in  FIG. 27A  showing locating tab  505 ; base  506 ; and inverted Ts  501 - 502 . 
       FIG. 28  is an upper front oblique view of the side fence  400 . Stiffening ribs  530 - 531  are shown here and in  FIGS. 26, 27A , &amp;  31 . 
       FIG. 29  is a bottom plan view of the side fence, showing bases  506 , locating tabs  505 , and inverted Ts  501 - 504 . 
       FIG. 30  is a top plan view of fence  500 . 
       FIG. 31  is a lower rear oblique view of fence  500 . 
     If fence  500  is rotated 180 degrees in the horizontal plane, it is symmetrical, and the above description and figures still apply, with the reference numbers still oriented by their direction forward and aft on the rotated fence  500 . 
       FIG. 32  is a front elevation of the presently preferred tray and track assembly  600  showing a logo plate  602 . The tray mold (not shown) has provision for a cam insert to emboss or deboss the client&#39;s name/logo  603  on the front  602  of the tray  600 , during molding of the tray  600 . Alternatively, a clear-fronted label pocket may be provided for replaceable product and/or price labels. 
     Towers  611  provide forward stops for product containers. 
       FIG. 33  is a top plan view of track  600 . Near the back end of the track guide surface  423 , at the beginning  421  of the last 1.151 inches of the track, one track edge  615 , at edge end  616  angles the last 1.151 inches in a straight line away from the centerline  617  of the slot  622 . The other track edge  423  makes a stepwise horizontal notch  421 , and then angles the last 1.151 inches in the straight line  625  back toward the centerline  617 , and parallel to edge  616 . But the outer edges of sliding guides  410  and  411  engage with their respective track edges,  410  with edge  615 - 616 , and  411  with track edge  423 , notch  421 , and edge end  625 . 
       FIG. 33B  is a side elevation in section through centerline plane B-B of  FIG. 33 . It illustrates how little space is lost below the display surface  626  of the track  600 . Rails  626 A ( FIGS. 33B  &amp;  FIG. 33 ) on the surface  626  diminish the contact surface with the pusher, to minimize surface area that might freeze and hamper pusher motion. A particular advantage of this embodiment is the thin floor thickness  627 , which is 0.135 inches. The far forward position of front wire slot  660  gets the floor clear aft of this vertical protrusion, and allows this thin floor dimension, which allows more room for product, in vertically crowded wire shelf displays. 
     On tower stop  611 , the top portion inner surface  628  ( FIG. 33B ) contacts a lid portion  629  ( FIG. 4A ) of the product container  50 . This high contact point ( 628   FIG. 33B ) resists having product tumble over the display front under pusher load. As shown in  FIG. 4A , lid  629  is sturdier than the body  50  of the product packages, and resists crushing under the load of a coil spring  10 , which is strong enough to reliably push heavy product, such as ice cream pints  50 , in a frozen environment. The presently preferred spring  10  is a variable force spring, with a maximum force at fully extended position, of 1.65 lbs. It is presently 0.008″ thick spring steel, ½″ wide. It is presently thought that the optimum spring force may be as much as 30% greater than 1.65 lbs. in humid and high-frost environments. 
       FIG. 33A  is a side elevation in section through plane E-E of  FIG. 33 . Plane E-E bisects sidewall  630  shown also in  FIGS. 35-37 .  FIG. 33A  shows slots  640  into which the locating tabs  505 , and inverted Ts  501 - 502  of fence  500 , may be inserted, and slid forward into narrower part  640 N of each slot  640 , to lock the bases  520  of fence  500  snugly to the top surface  645  of sidewall  630 . The aft part of each slot  640  comprises a depressible locking tab  646 , spring mounted by a plastic cutout  647  to upper surface  645 , all of which are molded as a unitary piece with tray assembly  600 . When inserted into the slot, protrusions  501 - 504  depress locking tab  606  on its spring  647 . When slid forward, to where the aftermost inverted T ( 502  or  504 ) clears tab  646 , then tab  646  snaps up against the back of its inverted T ( 502  or  504 ), and holds the inverted T and its base  506  and fence  500  in place atop top surface  645  of sidewall  630 . 
       FIG. 34  is a bottom plan view of the presently preferred track  600 . Holes  650  are provided in downwardly protruding horizontal surfaces  653 , for four neoprene feet such as  658  ( FIGS. 33A, 33B ) on the bottom of the tray  600 . These neoprene feet  658  are preferably assembled to the tray assembly  600  at assembly (they can alternatively be inserted on site), and help hold the tray assembly  600  in place when the tray assembly is mounted on a solid shelf, rather than on a wire frame shelf. 
     Slot  660  engages the front-most wire of a conventional wire shelf. By placing this slot forward and outside the inner floor of the tray assembly  600 , the thin floor dimension  627  of 0.135 inches can be achieved. 
       FIG. 35  is a side elevation of presently preferred track  600 . Slot  660  engages the front-most wire of a conventional wire shelf. 
       FIG. 35A  is a front elevation in section through plane C-C of  FIG. 35  showing track slot  622 . 
       FIG. 35B  is a front elevation in section through plane E-E of  FIG. 35 , forward of the track slot (not shown). 
       FIG. 36  is an upper front oblique view of track  600 . 
       FIG. 37  is a lower front oblique view of track  600 . 
     CIP 
     Applicant added the ability to retrofit a tall sidewall, divider, or fence  500  on the tray wall  630 , if a customer would like added stability for stacked product. 
     The mounting of tall sidewall, divider, or fence  500  on the tray walls  630 L  630 R of tray assemblies  600  is more clearly shown in  FIGS. 38, 39A, and 39B . 
       FIG. 38  is a top plan view of two of the presently preferred tray assemblies, interlocked together:
           600 L (to viewer&#39;s left when viewed from the front), and     600 R (to viewer&#39;s right when viewed from the front).       

     Locking hooks  700  ( FIGS. 33, 34, 35, 36, 38, 39A &amp; 39B ) can engage locking slots  701  ( FIGS. 34, 35, 35A, 37, 39A &amp; 39B ) adjacent track assemblies  600 L &amp;  600 R ( FIGS. 38-39 ). As arranged in  FIG. 39A , interlocking slot  701  of tray assembly  601 R&#39;s sidewall  630 R, is slid down over locking hook  700  of tray assembly  601 R&#39;s sidewall  630 L. 
     As in  FIG. 38A , three interlocking hooks  700  populate the base of sidewall  630 R. 
     In  FIG. 38 , the adjacent track assemblies  600 L &amp;  600 R, are flanked above and below by two bottom plan views of two side fences  500 C &amp;  500 R. Each fence  500  has a pair of feet  520 , one in front  520 F, and one in the back  520 B. Protruding from bottom surface  506  of feet  520  is a center tab  505 , which is inserted ( FIG. 39A ) between sidewalls  630 R &amp;  630 L and centers fence  500 . 
     After lowering, fence  500  is slid aft, and or forward, until:
         inverted T  503  drops into slot  642  on the top  645  of sidewall  630 R of tray  601 L; and   inverted T  504  drops into slot  644  on the top  645  of sidewall  630 L of tray  601 R.       

     To install, fence  500 C is inverted from the bottom plan view of  FIG. 38  to a base  520  down position atop  645  the trays  600 . 
     Inverted Ts  501 - 504 , are cooperatively spaced to slots  641 - 644 , so that:
         inverted T  502  drops into slot  641  on sidewall  630 R of tray  600 L;   inverted T  504  drops into slot  642  on sidewall  630 R of tray  600 L;   inverted T  501  drops into slot  643  on sidewall  630 L of tray  600 R; and   inverted T  503  drops into slot  644  on sidewall  630 L of tray  600 R.       

     Each slot such as slot  641  on sidewall  630 R of tray  600 R has a wide part  641 W and a narrow part  641 N, aft or backward from wide part  641 W. 
     Each inverted T  501 - 504  drops into the wide part such as  641 W, depresses a locking tab, such as depressible locking tab  646 , spring mounted by a plastic cutout  647  to upper surface  645 , all of which are molded as a unitary piece with tray  600 . 
     As described above on page 15,  FIG. 33A  shows slots  640 , differentiated in  FIG. 38  as slots  641 - 644 , into which the inverted Ts  501 - 504  of fence  500 , may be inserted, and slid forward into narrower part  641 N- 644 N of each slot  641 - 644 , to lock the bases  520  of fence  500  snugly to the top surface  645  of sidewall  630 L-R. The aft part of each slot  641 - 644  comprises a depressible locking tab  646 , spring mounted by a plastic cutout  647  to upper surface  645 , all of which are molded as a unitary piece with tray assembly  600 . When inserted into the slot, protrusions  501 - 504  each depress its respective locking tab  606  on its spring  647 . When slid forward, to where the inverted T  501 - 504  clears tab  646 , then tab  646  snaps up against the back of its inverted T  501 - 504 , and holds each inverted T and its base  506  and fence  500  in place atop top surface  645  of its respective sidewall  630 L &amp;  630 R. 
       FIG. 39A  is an exploded front elevation, in section, of said two presently preferred tracks  600 L &amp;  600 R, interlocked adjacent each other; with the fence  500  exploded above the top  645  of tracks&#39; adjacent sidewalls  630 L &amp;  630 R. 
       FIG. 39B  is a front elevation of fence  500  mounted atop the top  645  the tracks&#39; adjacent sidewalls  630 L &amp;  630 R. 
       FIG. 40  shows a fence  500 R set atop sidewall  630 R of a rightmost tray  601 R. An inverted T at  504  at the back of fence  500 R has been inserted into a corresponding slot  642  ( FIG. 38 ) at the back of sidewall  630 R. Tab  505  ( FIG. 40 ) rests against sidewall  630 R, to hold fence  500 R upright and support product packages such as ice-cream pints, in tray  601 R. 
     This helps stabilize an upper row of pints, atop the lower row of pints. 
     Since filing the provisional application Jan. 24, 2014, Applicant has made the following improvements, described more fully above, starting near the top of Specification page 10: 
     The locking mechanism which holds the pusher in the fully extended (back) position has been changed:
         from the raised, pressure sensitive tabs; to   a notch  421  which catches the side of the pusher when it reaches the back of the tray.       

     Applicant reduced the number of recesses (to sit on the wire shelf guard) at the front-bottom of the tray from three  14 , to one  660 , and moved that recess  660  proud of the stopper posts  11 , allowing a thinner floor. This changed the profile of the display, lowering the relationship of the product to the freezer shelf, measured at  627 , allowing greater clearance from the top of the product to the shelf above. 
     Applicant reduced the overall length of the display by about 3 inches, to 21 inches. 
     Applicant has used a fence  500  to stabilize the upper row of pints, and to help lock together adjacent tray assemblies  600 .