a first preferred form of display rack according to the invention is indicated generally at 10 in fig1 and 2 . in this form of the invention a plurality of shelves 11 are supported on opposed side panels 12 and 13 so that product p supported on the shelves is displayed and is accessible at both the front and the back of the rack . in the particular embodiment shown , the rack is designed for two - liter bottles but it should be understood that other products could be supported and displayed on the rack . tabs 14 and 15 on opposite ends of the shelves are received through slots 16 in the side panels , and locking pins 17 are inserted through openings 18 in the projecting end portions of the tabs to secure them in the slots . see fig3 . as seen best in fig2 - 25 and 31 , center shelf supports 19 extend from one side panel to the other and are engaged between the shelves along their longitudinal centerline . a bottom shelf support 19 ′ of reduced height relative to the center supports 19 extends beneath the bottom shelf . first tabs 20 on the ends of the shelf supports engage in slots 21 in the side panels , and second tabs 22 and 23 on the top and bottom edges of the center supports engage in slots 24 in the shelves . the bottom shelf support 19 ′ has tabs 22 only on its top edge . graphics panels 25 and 26 having tongues 27 and 28 on the inner surface thereof adjacent the top and bottom ends are attached to the outside faces of each side panel by engagement of the tongues in the openings 18 in the projecting end portions of the tabs 14 and 15 on the ends of the top and bottom shelves . see fig1 - 20 and 32 - 35 . a header 30 with graphics 30 ′ is supported on the top ends of the graphics panels 25 and 26 by engagement of notches 31 in the bottom edge of the header adjacent its opposite ends with notches 32 in the top ends of the graphics panels 25 and 26 . as seen best in fig4 - 6 , in the particular construction illustrated and described herein , each side panel 12 and 13 is comprised of three blanks or sheets 12 a , 12 b and 12 c of 51 - c - kraft / 33 laminated together , and a single blank or sheet 12 d of 51 - c - kraft / 33 laminated to the sheets 12 a - 12 c . in the present invention , 51 c kraft is the type of paper used to make the combined corrugated board which is a kraft back liner , 51 refers to the edge crush test ( ect ) value , and 33 is the lbs of the paper used in the medium or middle liner to make the combine corrugated board . the sheet 12 d forms the outer surface of the side panel in an assembled rack and has a flange 35 on its bottom end that is wrapped around the bottom ends of the laminated sheets 12 a - 12 c . as seen best in fig7 - 10 , the shelves 11 each comprise an inner piece or shelf core 11 a made up of two blanks or sheets 11 b and 11 c laminated together , and an outer wrap 11 d formed from a single blank or sheet 11 e folded around and laminated to the inner piece . the sheets 11 b , 11 c that are laminated together to form the shelf core each comprise a center panel 40 having length and width dimensions corresponding to the length and width dimensions of a finished shelf , and half panels 41 and 42 foldably joined to the front and back edges thereof , respectively . the outer edges of the half panels have offset cutouts 43 therein so that when the half panels are folded inwardly over the center panel they fit together along a generally zigzag line . this arrangement improves the bending strength of the core 11 a when the two folded sheets 11 b , 11 c are laminated together to form the core as shown in fig9 . in the particular construction shown and described herein , the sheets 11 b , 11 c are formed of 51 - bc - kraft / 33 where bc is defined as flute b and flute c as is known in the packaging industry . the sheet 11 e that forms the wrap 11 d comprises a center panel 45 having length and width dimensions corresponding to the length and width dimensions of the panel 40 of the core piece , and half panels 46 and 47 foldably joined to the front and back edges of the center panel . the center panel 45 of the wrap is overlaid with the center panel 40 of the core , and the half panels 46 and 47 folded inwardly and laminated to the core to form a finished shelf 11 as seen in fig1 . in the particular construction shown and described herein , the sheet 11 e that forms the wrap is formed of 40 - c - kraft . the center shelf supports 19 are each formed of four blanks or sheets 19 a - 19 d of 51 - bc - kraft laminated together as shown in fig1 , and the bottom shelf support 19 ′ is formed of four blanks or sheets 19 a ′- 19 d ′ of 51 - bc - kraft laminated together as shown in fig1 . the locking pins 17 are each formed of a single sheet 17 a of 40 - c - kraft , shown in fig1 , which is folded onto itself to form the generally t - shaped locking pin for insertion into the openings 18 in the tabs 14 and 15 as depicted in fig3 . the header 30 is formed of two sheets of 51 - bc - kraft laminated together , as depicted in fig1 . graphics panels 30 ′, shown in fig1 , are glued to the front and back surfaces of the header by the manufacturer prior to shipment of the rack to a point of use . in the particular construction described and illustrated herein , the graphics panels 30 ′ are made of 51 - bc - mwos ( i . e ., model white out side ). the graphics panels 25 and 26 are identically constructed and only panel 25 will be described in detail . panel 25 comprises three sheets 25 a , 25 b and 25 c laminated together . sheet 25 a , which forms an unbroken outer surface of the panel when it is installed , is made of 51 - bc - mwos , and sheets 25 b and 25 c are made of 51 - bc - kraft . each of sheets 25 b and 25 c is formed with the tongues 27 and 28 adjacent its top and bottom ends , but when the graphics panel is installed on the rack only the tongues on the innermost sheet 25 c are folded into operative position and inserted into the openings 18 in the projecting end portions of the tabs 14 and 15 on the ends of the top and bottom shelves as depicted in fig3 - 35 . it will be noted that the tongues have a first portion 50 foldably connected to the respective panel , and a second portion 51 foldably connected to the first portion . the first portion has a width the same as the width of the tab 14 or 15 between the opening 18 and the outer edge of the tab , thereby permitting the tongue to be folded inwardly and downwardly against the tab with the second portion extended through the opening 18 . after the tongues have been inserted into the openings 18 , locking pins 17 are then inserted through the openings 18 behind the portions 51 of the tongues . the display rack 10 is shipped to a point of sale in disassembled kit form in a compact package comprising the components of the rack in a shipping container c as illustrated in fig2 . the container c comprises a top tray adapted to fit over a bottom tray , both of rectangular construction and in the particular example described herein made of 40 - c - kraft . a blank for making one of the trays is shown in fig2 , it being understood that the blank for making the other tray is identical except for having a slightly different size so that one of the trays will fit within the other to form the container shown in fig2 . the steps of assembling the rack 10 are illustrated in sequence in fig2 - 36 , and when considered in conjunction with the remaining disclosures herein are believed to be self - explanatory . briefly , fig2 - 25 show the steps of assembling the shelves 11 and shelf supports 19 and 19 ′ to each other and to one of the side panels 12 . fig2 - 29 show the steps of assembling the second side panel 13 to the previously assembled shelves and shelf supports . fig3 shows one of the locking pins 17 being inserted into the opening 18 of the projecting end of a tab 14 or 15 . fig3 shows an assembled rack ready for attachment of the side and header graphics panels . fig3 - 35 show the steps of attaching a side graphics panel 25 or 26 , and fig3 shows the step of attaching the graphics header 30 to the previously attached side graphics . a second preferred form of display rack according to the invention is indicated generally at 60 in fig3 . the rack 60 has a back panel 61 mechanically interlocked with side panels 62 and 63 , and shelves 64 are supported by the side panels and the back panel . generally triangularly shaped shelf supports 65 are engaged between the shelves , and a graphics header 66 is attached to upper ends of the side panels . the side panels also contain graphics . the mechanical interlock between the back panel 61 and the side panels 62 and 63 comprises a plurality of generally equally spaced tabs 67 and 68 projecting from opposite side edges of the back panel and engaged in notches 70 along the back edge of the respective side panels . each side panel has a plurality of spaced parallel channels 72 formed on its inner surface , extending at one end through the front edge of the panel but terminating at its opposite end spaced from the back edge of the panel . depending flanges 73 , 74 on the opposite side edges of the shelves are received in the channels to support the shelves on the side panels . a plurality of spaced parallel slots 75 are formed through the back panel , spaced closer to the bottom end of the panel than to its top end , and a tab 76 projecting from the rearward edge of each shelf 64 is received through a respective slot . the ends of the tabs projecting through the slots each has an opening 18 therethrough , and a locking pin 17 is inserted into the opening 18 to pin the shelves to the back panel in the same manner that the shelves in the first embodiment are pinned to the side panels . the back panel 61 is comprised of four blanks or sheets 61 a - 61 d of 51 - bc - kraft laminated together , with one of the sheets 61 a forming an outer surface of the back panel in an assembled rack . the sheet 61 a has a flange 77 on its bottom end that is folded around the bottom ends of the other three sheets , as shown in fig6 . the side panels 62 and 63 are identically constructed and only one panel 62 will be described in detail . the panel 62 is comprised of four blanks or sheets 62 a - 62 d of 51 - bc - kraft laminated together . sheet 62 a has a convexly curved forward edge portion and a flange 65 on its bottom end that is folded around the bottom ends of sheets 62 b - 62 d . sheet 62 a forms an outer surface of the side panel when it is installed in a rack . parallel spaced slots 80 extend into sheet 62 b through the forward edge thereof , terminating short of the rearward edge of the sheet , and parallel spaced slots 81 extend into sheets 62 c and 62 d through the forward edges thereof . the slots 80 and 81 are in registry with one another , but slots 81 are narrower than slots 80 , whereby the slots form the channels 72 . see fig5 and 59 . the sheets 62 b - 62 d have concavely curved forward edges . small tabs 82 extend upwardly from the front corners of each of the sheets . a side graphics panel 85 made of 51 - bc - mwos is applied to the outer surface of each of the side panels 62 and 63 . see fig3 , 48 and 49 . the shelves 64 comprise an inner piece or core 85 and an outer wrap 86 . as seen in fig5 and 51 , the core 85 is formed from a blank or sheet 85 a having a center panel 90 of substantially the same length and width as a finished shelf , with a first half panel 91 folded to an edge of the center panel that corresponds to the forward edge of the shelf , a second half panel 92 folded to the first half panel , a third half panel 93 folded to the edge of the center panel opposite the first half panel and which forms the rearward edge of the shelf , and a fourth half panel 94 folded to the third half panel . a cut 95 is made in the edge of the center panel adjacent the third half panel and when the panels are folded into the configuration shown in fig5 , the material separated from the center panel by the cut forms a part of the tab 76 projecting from the rear of the shelf when the sheet is folded to form the shelf . in the particular example disclosed herein , the sheet 85 a comprises 51 - bc - kraft . as seen in fig5 , the wrap 86 is formed from a sheet 86 a having first and second panels 100 , 101 , which form the top and bottom surfaces , respectively , in a completed shelf . the panels 100 and 101 are foldably joined along adjacent edges and each has substantially the same outline as a shelf 64 . cutouts 102 in the sides of the sheet at the folded connection between the panels form extensions 76 a , 76 b that comprise part of a tab 76 in the completed shelf . first flaps 103 are foldably connected to opposite side edges of panel 100 , and second flaps 104 are foldably connected to the outer edges of the first flaps . a shaped cut 105 extends along most of the length of the fold between the first and second flaps . when the wrap 86 is folded around the core 85 and the flaps 103 and 104 are folded downwardly as depicted in fig5 , the flaps 103 extend downwardly from opposite side edges of the shelf to form the flanges 73 , 74 . the second flaps 104 are glued to the bottom of the panel 101 . the outer end edges of the panels 100 , 101 are outwardly curved , and the curved edge 106 on panel 101 is joined to the panel along a narrow panel 107 , whereby when the wrap is in operatively folded relationship around the core 85 , the panel 107 extends upwardly at an angle and the curved edge 106 is glued to the underside of the curved edge on panel 100 to form an outwardly curved lip on the shelf . see fig4 . a pair of small slots 108 and 109 is formed in the panel 101 near its rearward and forward edges , and a small slot 110 is formed in panel 100 near its rearward edge , for a purpose described hereinafter . in the particular example disclosed herein , the sheet 86 a comprises 55 - c - kraft . fig5 shows a blank or sheet 66 a that is folded to make the header 66 . adhesive is applied in the shaded areas 111 , 112 at opposite ends of the sheet , and these areas are adhered together when the sheet is folded to form the generally tubular shape shown in fig5 a . in the particular example disclosed herein , the header 66 is made of 32 - e - kraft . as shown in fig5 and 55a , the triangularly shaped shelf supports 65 are made from a blank or sheet 65 a that is folded on itself along a fold 115 to form a double thickness . a narrow slot 116 is cut out along the fold 115 so that when the sheet is folded in half two small tabs 117 and 118 are formed along the edge . a small tab 119 also is on the narrow edge of the support . when the shelf support is installed , as shown in fig6 , the tab 119 on the bottom edge of the support is engaged in slot 110 in the top of the subjacent shelf , and the tabs 117 , 118 are engaged in the slots 108 , 109 , respectively , in the bottom of the superjacent shelf . in the particular example disclosed herein , the shelf supports are made of 51 - bc - kraft . the steps for assembling the rack 60 are illustrated in fig5 - 67 and are believed to be self - explanatory . briefly , fig5 shows the side panels 62 and 63 being assembled to the back panel 61 , and fig5 shows the side panels installed . fig5 shows the channel 72 just above the bottom of the rack , and fig5 is a view looking up under a shelf and showing how a flange 73 or 74 on the edge of the shelf is positioned to be slid into the channel . fig6 illustrates a shelf in position attached to the side and back panels , and shows the slot 75 in the back panel for receiving the tab 76 on the back of a shelf to be installed . fig6 shows the subsequent shelf installed . fig6 shows the back panel being tapped to fully seat the tab 76 in the slot 75 , and fig6 shows a locking pin 17 being inserted into the opening 18 in the tab end portion that projects through the back panel . fig6 shows one of the shelf supports 65 being installed with the narrow edge down , and fig6 shows the assembled rack before the header is installed . fig6 shows the header 66 being opened up into a generally tubular configuration and fig6 shows the header being installed on the tabs 82 projecting upwardly from the front corners of the side panels . a variation of the rack 60 is shown at 120 in fig6 . this rack differs from rack 60 in that the front edge of the side panels 62 ′, 63 ′ is convexly curved over its length rather than being convexly curved over its bottom portion as in the rack 60 . in all other respects the rack 120 is constructed identically to rack 60 . components for constructing the rack 120 are shown in fig6 , wherein parts corresponding to the parts in rack 60 are given the same reference numbers . fig7 is a front perspective view of alternative variation of the rack in fig3 and 38 , wherein the top shelf 64 comprises a tray 64 a so that fruits and / or vegetables or in combination with liquid bottle being disposed therein and a base b is adhered to underside of the bottom shelf . the tray 64 a has an interior space 64 b that contains fruits such as , for example , banana or other vegetables therein . a header 66 ′ is installed on the rack as well . it is within the scope of the present invention that a divider may be placed within the tray or the shelf so that varieties of items such as fruits , bottle of water and the likes disposed therein . the rack in fig7 is assembled from components depicted in fig7 . a third preferred form of display rack according to the invention is shown at 150 in fig7 . this rack is similar to the rack 60 in that it has opposite side panels 151 , 152 mechanically locked to a back panel 153 by interengaged tabs 67 , 68 and slots 70 along the adjacent side edges of the back and side panels , with shelves 154 supported on the back and side panels , but the construction of the side and back panels , the shelves , the shelf supports , and the graphics wrap applied to the side and back panels is different than in the previous embodiments . instead of a single row of slots 75 in the back panel as in the fig3 embodiment , the back panel 153 in the rack 150 of the fig7 embodiment has a double row of slots 75 a and 75 b , and the shelves 154 each has two tabs 76 a and 76 b that are engaged in the respective slots when the shelves are in operative assembled position . the tabs each have an opening 18 in the end portion projecting through the back panel , and a locking pin 17 is engaged in the openings to secure the tabs in position , as in the previous embodiments . further , the upper end of the back panel is extended to form a graphics header 155 . tongues 156 , 157 project outwardly from opposite side edges of the shelves , and small circular holes 158 , 159 are formed in the top and bottom surfaces , respectively , spaced inwardly slightly from the front edge of the shelf and closely adjacent the opposite side edges . the side panels 151 and 152 are narrower than the side panels in the previous embodiments and are rectangularly shaped . each side panel has a row of slots 160 arranged along its length and a narrow slit 161 spaced a short distance from each slot 160 . when the shelves and side panels are in operative position , the tongues 156 , 157 are extended outwardly through the slots 160 and a forward end thereof is folded rearwardly and inserted into a respective slit 161 as seen best in fig9 - 98 and 102 , 103 . the shelves are thus supported on the back panel by the tabs 76 a , 76 b engaged in slots 75 a , 75 b , and on the side panels by engagement of the tongues 156 , 157 in the slots 160 and slits 161 . the shelf supports in this form of the invention comprise a plurality of rods or poles 165 extended between adjacent shelves and engaged at their opposite ends in the holes 158 , 159 , respectively . a skirt assembly 170 is positioned beneath the bottom shelf and includes a pair of short poles 165 ′ engaged at their upper ends in holes 159 ′ in the underside of the upper panel 171 of the skirt assembly and extending at their lower ends to contact a support surface on which the display rack is resting . the poles 165 ′ are in alignment with the poles 165 extending between the shelves 154 , whereby the front portions of all the shelves are effectively supported from the supporting surface . depending flanges 172 and 173 extend across the front and sides , respectively , of the skirt assembly to hide the space beneath the bottom shelf . a graphics wrap 180 in this form of the invention includes a back panel 181 that extends completely across the back of the display rack , side panels 182 and 183 that extend across the side panels of the rack , and flanges 184 that fold around and cover the front edges of the side panels 151 , 152 of the rack and are frictionally engaged between adjacent shelves to hold the graphics wrap in place . as shown in fig7 - 76 , the back panel 153 is composed of three blanks or sheets 153 a laminated with a sheet 153 b , and a graphics panel 190 applied to the front of the back panel and that spans the distance between the top and bottom shelves . the sheet 153 b forms the outer surface of the back panel in an assembled rack and has a flange 191 on its bottom end that is wrapped around the bottom ends of the laminated sheets 153 a . shallow recesses 192 are formed in the top and bottom edges of the graphics panel , providing clearance for the tabs 76 a , 76 b on the backs of the shelves , and similar shallow recesses 193 are formed in the side edges to provide clearance for the tabs 67 , 68 on the side edges of the side panels . in a particular example of the display rack described herein , the sheets 153 a and 153 b are made of 61 - bc - kraft / 40 , and the graphics panel is made of 32 - b - mwos . fig7 - 80 depict the blanks or sheets that are used to make one of the side panels 151 or 152 . since the side panels are identically constructed , only side panel 151 will be descried . side panel 151 is composed of three blanks or sheets 151 a laminated with a sheet 151 b . sheet 151 b forms the outer surface of the side panel when operatively installed in a rack and has a plurality of cutouts 194 shaped like the tongues 156 , 157 , whereby when the flange is folded into operative locked position it is flush with the outer surface of the side panel . a flange 195 on its bottom end is folded around the bottom ends of the laminated sheets 151 a , as shown in fig8 . in the particular example described herein , the blanks 151 a and 151 b are made of 61 - bc - kraft / 40 . the side panels and back panels preferably are made of a moisture resistant material such as climaguard ® by international paper company . fig8 shows a blank 154 a for making an inner part or core 196 of a shelf 154 . the blank comprises two panels 197 , 198 foldably joined along an edge opposite the edges on which tabs 76 a , 76 b are formed , and fig8 shows how the blank is folded to make one piece used in making the core . two of these pieces are laminated together for each shelf . small tabs 199 project outwardly from the sides of the core adjacent the edge on which the tabs 76 a , 76 b are formed . in the particular example described herein , the blank is made of 61 - bc - kraft / 40 . a blank or sheet 154 b for making a shelf wrap 200 is shown in fig8 , and in fig8 the wrap is shown being applied to the core 196 . the wrap comprises two panels 201 , 202 foldably joined along an edge opposite the edges on which tabs 76 a , 76 b are formed . small tabs 203 project from opposite side edges of panel 201 in positions corresponding to the tabs 199 on the core , and the tongues 156 , 157 project outwardly from opposite side edges of panel 202 in positions corresponding to the positions of the tabs 199 and 203 . in the particular example described herein , the wrap is made of 44 - b - kraft . when a shelf 154 is assembled to the rack , the tabs 199 and 203 on the side edges of the shelves are engaged along with the tongues 156 , 157 in slots 160 in the rack side panels . fig8 shows a pole stop 210 that is placed between the center laminations in each shelf at the locations of the holes 158 , 159 to limit the extend of insertion of a pole 165 or 165 ′ into the holes so that the poles extend at their ends only about half way through the thickness of a shelf . in the particular example described herein , the pole stops are made of 32 - e - kraft . fig8 shows a blank 17 a for making a pin 17 , as in the previous forms of the invention . fig8 and 88 show the fiber shelf - supporting poles 165 and 165 ′ used in the embodiment of fig7 . in the specific construction disclosed herein , the longer pole has a length of about 11⅜ inches , the shorter pole has a length of about 3¾ inches , and both have a diameter of about 1¼ inches . fig8 shows a header graphics panel 220 that is applied to the front top surface of the back wall . in the particular example disclosed herein , the header graphics panel 220 is made of 32 - b - kraft , and has notches 221 in its bottom edge for clearance of the tabs 76 a , 76 b on the back edge of the top shelf in an assembled rack . the blank for making the skirt assembly 170 is shown in fig9 . the blank comprises the upper panel 171 , side flanges 173 , first and second front flange parts 172 a , 172 b that are folded to make the front depending flange 172 , and tabs 225 . to erect the skirt assembly , flanges 173 and tabs 225 are folded upwardly and tabs 225 are then folded inwardly . front flange part 172 a is then folded upwardly against tabs 225 , and second front flange part 172 b is then folded inwardly and downwardly over the tabs 225 , with the narrow tabs 226 on the bottom edge of second flange part engaged in slots 227 to hold the skirt assembly in folded orientation . the shorter shelf support poles 165 ′ are inserted through the holes 159 ′ in the panel 171 and into the holes 159 in the bottom surface of the bottom shelf to form a wrap . a blank for making the graphics wrap 180 is shown at 230 in fig9 . the blank includes a first flange 231 folded to the top of back panel 181 , and a second flange 232 folded to the first flange . when the wrap is applied to a display rack , the flanges 231 and 232 are folded inwardly and downwardly over the top edge of the back wall of the rack . in the particular example disclosed herein , the wrap is made of 32 - b - mwos . the steps of assembling the rack 150 are shown in sequence in fig9 - 110 , and are believed to be self - explanatory . briefly , fig9 - 95 show the shelves 154 being assembled to the back panel 153 by inserting the tabs 76 a , 76 b into the slots 75 a , 75 b . the side panels 151 and 152 are then installed , as shown in fig9 - 98 , by moving them into position and inserting the tongues 156 , 157 and tabs 199 , 203 on opposite side edges of the shelves through the slots 160 in the side panels . the shelf support poles 165 are then installed , as shown in fig9 - 101 , followed by folding of the tongues and insertion of the forward end thereof into the slits 161 in the side panels as shown in fig1 - 104 . the assembly is then turned onto its face as seen in fig1 and pressure exerted against the back panel 153 to ensure that the tabs and notches along adjacent side edges of the back and side panels , and the shelf tabs extended through the slots in the back panel , are all fully seated . the locking pins 17 are then inserted into the openings 18 in the ends of the tabs extended through the back panel as shown in fig1 and 108 . thereafter , as shown in fig1 , the graphics wrap 180 is wrapped around the back and side panels of the display rack and the flanges 184 are inwardly folded and inserted between adjacent shelves , where the flanges are held by friction to retain the graphics wrap in place . a variation of the fig7 embodiment is shown at 300 in fig1 - 115 . this form of the invention is structurally the same as the fig7 embodiment , but it has a different graphics wrap 301 . in this form of the invention , the graphics wrap 301 has a back panel 302 adapted to extend across one side edge portion of the back panel of the display rack , a side panel 303 adapted to extend across one side of the rack , and a front panel 304 adapted to extend across one edge portion of the front of the display rack . as seen in fig1 , the back panel 302 has a plurality of slots 305 therein adapted to receive the tabs 76 a that extend through the set of slots adjacent one side edge of the back panel , and a plurality of pieces of double face tape 306 are placed on the inside surface of the front panel in positions corresponding to the locations of the shelves . to install this wrap , the back panel 302 is first placed over the tabs 76 a and the pins 17 then inserted to hold the back panel in place . the wrap is then folded around the side and front panels and the double face tape adhered to the fronts of the shelves . all of the components of the various embodiments of racks disclosed herein are made of 100 % recyclable materials , e . g . fiber - based containerboard , and at least the structural components comprise multiple sheets laminated together . at least some of the components , and particularly the side panels and back panels comprise a material that is treated to enhance its moisture resistance . a suitable material is climaguard ® containerboard by international paper company . although specific flute combinations and materials have been described herein , it should be understood that the disclosed materials were selected for a particular purpose , and it is within the scope of this invention that other materials could be employed depending upon the intended use and requirements of the display rack . the mechanical interlocks provided by the tabs , slots and locking pins , and the laminated construction of the components , form a very strong , rigid structure that resists twisting and is durable over prolonged periods of use in a retail environment . the components can be shipped flat in a very compact package , and can be quickly and easily assembled without requiring the use of tools . while particular embodiments of the invention have been illustrated and described in detail herein , it should be understood that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention as defined by the appended claims .
a freestanding display rack used for supporting and displaying product at a point of sale . the display rack is made entirely of fiber recycling chains and can be shipped in a knocked - down flattened condition . the display rack comprises a pair of spaced apart side panels and a plurality of shelves extend between and supported at their opposite ends on the side panels by a plurality of mechanical interlocking engaged between the shelves and the side panels . the plurality of mechanical interlocking means comprise slots in the side panels and tabs integral with the shelves on opposite ends thereof extended through the slots . an opening formed in an end of each of the tabs projecting through the slots in the respective side panel . a locking pin inserted in each the opening to prevent withdrawal of the tabs from the slots . a graphics header extends above the shelves and side panels .