Abstract:
The foldable display stand has a stepped display shelving portion removably mounted over a foldable support base. The shelving portion is formed by folding various parts of a configuration formed on a single sheet material. The configuration includes a plurality of rectangular panels connected by a plurality horizontal fold lines. Side extensions are formed on the two side edges of the rectangular panels which are foldable to form side wall of the shelves and the side walls are mounted in place by mounting tabs formed in the side extensions and mounting slots formed in the selected rectangular panels. Side extensions having a unique design are adapted to form reinforced side walls of the shelves.

Description:
FIELD OF THE INVENTION 
   This invention relates to stepped display stands and particularly relates to merchandise display stands including a foldable display having a plurality of shelves in a stepped configuration and removably mounted on a foldable support base. 
   BACKGROUND OF THE INVENTION 
   Display stands made of cardboard or corrugated paper board are widely used for showing varieties of merchandises. Such stands are convenient to erect, low cost to produce and providing adequate durability for repeated uses. A stand may also be made by stamping its configuration on a single cardboard and then folding the various parts of the configuration to form the stand having both the display tray and the integral support base. Pictures and various decorations and advertising information may be printed on the stand for attracting the consumers&#39;s attention and interest of the merchandise. One drawback of such display stand is that the merchandise is placed within a tray such that it is not visible to the consumers and the merchandise is difficult to be removed from the tray for selection and purchase. Such drawback is alleviated by providing a display portion in the form of a plurality of stepped shelves such that the various items of the merchandise placed on the stepped shelves are clearly visible and may be conveniently selected and removed for examination and purchase. 
   However, when the display shelves and the supporting base are integrally formed with one single cardboard configuration, it is cumbersome to erect by a single person due to the necessity to fold a plurality of parts while holding some of the parts that have already been folded in order to fold other parts. Furthermore, the entire integral display shelves and supporting base when unfolded to a collapsed condition for storage and transportation is rather bulky for packaging. 
   SUMMARY OF THE INVENTION 
   It is a principal object of the present invention to provide a display stand having separate display portion in the form of a plurality of display shelves and foldable support base which may be mounted together quickly and easily. 
   It is another object of the present invention to provide a display stand having a plurality of display shelves formed with a single configuration on a single cardboard which may be easily erected and unfolded to a collapsed compact condition for storage and transport. 
   It is another object of the present invention to provide a display stand having a plurality of shelves with reinforced shelves or platforms and side walls. 
   It is another object of the present invention to provide a configuration for forming a display stand having a plurality of shelves with reinforced platforms with side walls in which decoration or print may be provided on a single surface of the configuration such that when the various parts are folded to form the shelves, the decoration or print will appear on the front surface of the platforms as well as the side walls. 
   It is another object of the present invention to provide a configuration for forming a display stand having a plurality of shelves with reinforced platforms with side walls in which different decoration or prints may be provided on different parts of the configuration such that when the various parts are folded to form the shelves, various decoration or prints will appear on intended surfaces of the shelves and side walls. 
   It is yet another object of the present invention to provide a display stand having separate display portion and support base in which the support base is self-erecting. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Other objects will be in part apparent and in part pointed out hereinafter with reference to the accompanying drawings in which 
       FIG. 1  is a perspective front elevation view of the display stand according to the present invention. 
       FIG. 2  is a perspective front elevation view of the display stand showing mounting tabs in the unfolded condition which are operative for mounting the display shelves portion and the support base together. 
       FIG. 3  is a perspective front elevation view of the support base of the display stand. 
       FIG. 4  is a perspective front elevation view of the display shelves portion of the display stand. 
       FIG. 5  is a perspective front elevation view of the configuration provided on a cardboard which may be folded to form the display shelving portion of the display stand. 
       FIG. 6  is a perspective front elevation view of the display stand with both the display shelves portion and the support base in the collapsed folded condition for storage and transport. 
       FIG. 7  is a perspective front elevation view of the self-erecting support base. 
       FIG. 8  is a cross sectional perspective elevation view of the self-erecting support base along section line VIII—VIII of  FIG. 7 . 
       FIG. 9  is a perspective front elevation view of a second embodiment of the display stand having reinforced shelves or platforms and side walls. 
       FIG. 10  is a perspective front elevation of the configuration formed on a single cardboard which may be folded to form the second embodiment of the display stand of  FIG. 9 . 
       FIG. 11  is an isolated enlarged perspective front elevation view of the top left portion of the configuration showing how it may be folded to form a side wall of the embodiment of  FIG. 9 . 
       FIG. 12  is an isolated enlarged perspective front elevation view of the top left portion of the configuration showing how the side extension portion is to be folded to form the final reinforced side wall with the same decoration or print all appearing on the outer surface of the platforms and the side walls. 
       FIG. 13  is a perspective front elevation view of a third embodiment of the display portion of the stand having reinforced platforms and side walls with different decorations and prints appearing on the platforms and side walls. 
       FIG. 14  is a perspective front elevation view of the configuration formed on a single cardboard for forming the display shelves of the third embodiment of  FIG. 13  with reinforced platforms and side walls having different decorations and prints on their outer visible surfaces. 
       FIG. 15  is an isolated perspective elevation view of the top portion of the shelving showing the third embodiment with parts partially folded in the formation of the side walls. 
       FIG. 16  is an isolated perspective elevation view of the top portion of the shelving portion showing the folding of the additional portion to form the final reinforced side wall of the third embodiment shown in  FIG. 13 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   With reference to the drawings in which same reference numerals designate like parts in the various views, the display stand  10  of the present invention comprises of a separate display shelving portion  11  and a support base  12 . For simplicity of illustration, a display stand having three stepped shelves is shown as an example. The display shelving portion  11  may be formed by stamping or cutting a configuration  13  as best shown in  FIG. 5  having a substantially rectangular top panel  14 , second panel  15 , third panel  16 , fourth panel  17 , fifth panel  18  and lower sixth panel  19 . A horizontal fold line  20  is located between the top panel  14  and the second panel  15 . Similarly, a horizontal fold line  21  is located between the second panel  15  and the third panel  16 ; a fold line  22  is located between the third panel  16  and the fourth panel  17 ; a horizontal fold line  23  is located between the fourth panel  17  and the fifth panel  18 ; and a horizontal fold line  24  is located between the fifth panel  18  and the lower sixth panel  19 . Two substantially triangular extension portions  25  and  26  are located at two sides of the top panel  14 . Two mounting hooks  27  and  28  are formed at the upper edge adjacent to the outer corner of the extension portions  25  and  26 . Similarly, two substantially triangular extension portions  29  and  30  are located at the two sides of the fourth panel  17 , and two mounting hooks  31  and  32  are located at the upper edge adjacent to the outer corners of these extension portions  29  and  30 ; while two substantially triangular extension portions  33  and  34  are located at the two sides of the lower sixth panel  19 , and two mounting hooks  35  and  36  are located at the upper edge adjacent to the outer corners of these extension portions  33  and  34 . 
   A vertical slot  37  is located adjacent the left side edge  38  of the top panel  14  and it is directly aligned with the left side edge  39  of the second panel  15 . A second vertical slot  40  is located adjacent the right side edge  41  of the top panel  14  and it is directly aligned with the right side edge  42  of the second panel  15 . Similarly, a vertical slot  43  is located adjacent the left side edge  44  of the third panel  16  and it is directly aligned with the left side edge  45  of the fourth panel  17 , and a vertical slot  46  is located adjacent to the right edge  47  of the third panel  16  and it is directly aligned with the right side edge  48  of the fourth panel  17 ; a vertical slot  49  is located adjacent the left side edge  50  of the fifth panel  18  and it is directly aligned with the left side edge  45  of the fourth panel  17 , and a vertical slot  51  is located adjacent to the right side edge  52  of the fifth panel  18  and it is directly aligned with the right side edge  48  of the fourth panel  17 . 
   A pair of parallel vertical slots  53  and  54  is located adjacent to the left side edge  39  of the second panel  15 , and a pair of parallel vertical slots  55  and  56  is located adjacent to the right side edge  42  of the second panel  15 . Similarly, a pair of parallel vertical slots  57  and  58  is located adjacent to the left side edge  45  of the fourth panel  17 , and a pair of parallel vertical slots  59  and  60  is located adjacent to the right side edge  48  of the fourth panel  17 ; a pari of parallel vertical slots  61  and  62  is located adjacent to the left side edge  63  of the lower sixth panel  19  and a pair of parallel vertical slots  64  and  65  is located adjacent to the right side edge  66  of the sixth lower panel  19 . 
   The shelving portion  11  may be formed by first folding the top panel  14  upwards along the horizontal fold line  20  until it is perpendicular to the second panel  15 . The side extension portions  25  and  26  may also be folded upwards along the side edges  39  and  42  until they are perpendicular to the second panel  15 . The mounting hooks  27  and  28  may then be engaged with the vertical slots  37  and  40  respectively to maintain the two panels  14  and  15  in the perpendicular erected condition. Similarly, the third panel  16  may be folded upwards relative to the fourth panel  17  and the extension portions  29  and  30  are folded upwards with their mounting hooks  31  and  32  engaging with the vertical slots  43  and  46  respectively in the third panel  16  to maintain these two panels in the perpendicular erected condition; and the fifth panel  18  is folded upwards with respect to the lower sixth panel  19  and the extension portions  33  and  34  also folded upwards with their mounting hooks  35  and  36  engaging respectively with the vertical slots  49  and  51  to maintain these panels in the perpendicular erected condition. The erected shelving portion  11  is best shown in  FIG. 4 . The shelving portion  11  may be easily disassembled by disengaging the mounting hooks  27 ,  28 ,  31 ,  32 ,  35  and  36  from the respective vertical mounting slots  37 ,  40 ,  43 ,  46 ,  49  and  51 , and then folding sequentially the fifth panel  18  over lower sixth panel  19 , the fourth panel  17  over the folded fifth panel  18  and sixth panel  19 , the third panel  16  over the folded fourth, fifth and sixth panels, folding the second panel  15  over the folded third, fourth, fifth and sixth panels, and lastly folding the top panel  14  over the now folded second, third, fourth, fifth and sixth panels to a compact collapsed condition for storage and transport. 
   The support base  12  is also formed with a single configuration stamped with a single piece of cardboard. The configuration has a first panel  67  having horizontal stepped top edges  68 ,  69  and  70  separated by vertical side edges  71  and  72 ; a rectangular panel  73  extending sideways from the vertical right side edge  74  of the first panel  67 , a third panel  75  which is a mirror image of the first panel  67  and having horizontal stepped top edges  76 ,  77  and  78  which are separated by vertical side edges  79  and  80 ; a rectangular fourth panel  81  extending sideway from the vertical right side edge  82  of the third panel  75 . An extension vertical mounting edge portion  83  is formed at the left side edge of first panel  67  so that the support base  12  may be fabricated by adhering the extension vertical mounting edge portion  83  with the vertical right side edge of the fourth panel  81  as best shown in  FIG. 3 . The width of the top edges  68  and  76  are equal to one another as well as the distance between the fold lines  20  and  21  of the shelving portion  12 . Similarly, the width of the top edges  69  and  77  are equal to one another as well as the distance between the fold lines  22  and  23  of the shelving portion  12 ; and the width of the top edges  70  and  78  are equal to one another as well as the distance between the fold line  24  and the lower edge  24 A of the lower sixth panel  19 . 
   The height of the vertical edges  71  and  79  are equal to one another as well as the distance between the fold lines  21  and  22  of the shelving portion  12 ; and the height of the vertical edges  72  and  80  are equal to one another as well as the distance between the fold lines  23  and  24 . 
   A mounting tab  84  extends upwards from the top edge  68  and a mounting free end portion  85  is formed at its upper end portion. Similarly, a mounting tab  86  having a mounting free end portion  87  extends upwards from the top edge  76 ; a mounting tab  88  having a mounting free end portion  89  extends upwards from the top edge  69 ; a mounting tab  90  having a mounting free end portion  91  extends upwards from the top edge  77 ; a mounting tab  92  having a mounting free end portion  93  extends upwards from the top edge  70 ; and a mounting tab  94  having a mounting free end portion  95  extends upwards from the top edge  78 . 
   A rectangular extension portion  96  may be provided along the upper edge  97  of the rectangular panel  73 . 
   A vertical fold line  98  is provided at the middle of the first panel  67  as well as the mounting tab  88 ; and a similar vertical fold line  99  is provided at the middle of the third panel  75  as well as the mounting tab  90 . The base portion  12  may be folded to a compact collapsed condition for storage and transport as best shown in  FIG. 6  by pushing the stepped panels  67  and  75  towards each other and folding them inwards along the vertical fold lines  98  and  99 . 
   The shelving portion  11  may be easily and quickly mounted on the support base  12  by placing the shelving portion  11  over the latter such that the mounting tabs  84 ,  86 ,  88 ,  90 ,  92  and  94  engage with the mounting slots  53 ,  56 ,  57 ,  60 ,  61  and  65  respectively. The shelving portion  11  and the support base  12  may then be fixedly mounted together by inserting the mounting free end portions  85 ,  87 ,  89 ,  91 ,  93  and  95  into the mounting slots  54 ,  55 ,  58 ,  59 ,  62  and  64  respectively. 
   The entire erected stand may be disassembled easily and quickly by simply disengaging the mounting tabs of the support base from the mounting slots of the shelving portion  11  and then folding the shelving portion  11  and support base  12  to the collapsed condition as described above for storage and transport. 
   A support base  12  may be made self-erecting by providing a pivotal panel  100  mounted in a diagonal manner within the base. A vertical edge  101  of the pivotal panel  100  is mounted at the joined vertical edge between the panels  67  and  81  and it extends to the opposite corner to engage with the fold line  74 . An extension tab  102  is formed at its vertical edge adjacent to the fold line  74 . The extension tab  102  will engage with a retaining opening  103  formed at the fold line  74 , so that in the erected condition the extension tab  102  will engage with the retaining opening  103  to maintain the base in the erected condition. An elastic cord  104  is provided between the pivotal panel  100  and the fold line  74  corner of the support base  12  as best shown in  FIG. 8 . The support base  12  may be folded to a collapsed condition by pushing the opposite corners of the base outwards to disengage the extension tab  102  from the retaining opening  103  and then also pushing the panels  67  and  75  outwards to fold along vertical fold lines  98  and  99 . The elastic cord  104  will be in a tension state when the support base  12  is folded in the collapsed condition so that the support base may be easily erected by merely allowing the tension of the elastic cord  104  to pull the pivotal panel  100  back to the diagonal position to unfold the support base as well as to maintain it in the erected condition. 
   A second embodiment of the shelving portion  11  having reinforced shelves as well as side walls is shown in  FIG. 10 . The configuration provided in the cardboard for forming the shelving portion  11  includes a first horizontal reinforcing panel  105  located between the second panel  15  and third panel  16 , and a second horizontal reinforcing panel  106  is located between the fourth panel  17  and fifth panel  18 . Trapezoidal reinforcing side panels  107 ,  108 ,  109 ,  110 ,  111  and  112  are provided at the side edges  38 ,  41 ,  44 ,  47 ,  50  and  52  respectively and extending sideways outwardly therefrom. Alternatively, these side panels may have a triangular shape. The mounting openings  38 ,  40 ,  43 ,  46 ,  49  and  51  are formed in the reinforcing side panels  107 ,  108 ,  109 ,  110 ,  111  and  112  along the side edges  38 ,  41 ,  44 ,  47 ,  50  and  52 , instead of in the panels  14 ,  16 , and  18  as in the previous embodiment described above, as best shown in  FIG. 10 . 
   The extension portion extending sideway from the left edge  39  is further divided into two triangular portions  113  and  114  separated by a common fold line  115 . The triangular portion  114  is juxtaposed to the side edge  39  of the panel  15 . Similarly, the extension portion extending sideway from the right edge  42  of the panel  15  is further divided into two triangular portions  116  and  117  divided by a common fold line  118 . A rectangular cut out  119  is formed at the upper edge of the triangular portion  114  and a mounting tab  120  is provided at the upper edge of the triangular portion  113 . The length of the rectangular cut out  119  is equal to the length of the vertical mounting slot  37 . Similarly, a rectangular cut out  121  is formed at the upper edge of the triangular portion  116  and a mounting tab  122  is formed at the upper edge of the triangular portion  117 . 
   The extension portion extending sideway from the left edge  45  of panel  17  may have the same configuration as that of panel  15  but it is preferably divided into a triangular portion  123  juxtaposed to the left edge of the panel  17  and an outer trapezoidal portion  124  having a common fold line  125  between them. Similarly, the extension portion extending sideway from the right edge of panel  17  is divided into a triangular portion  126  and an outer trapezoidal portion  127  having a common fold line  128 . A rectangular cut out  129  is formed at the upper edge of the triangular portion  123  and a mounting tab  130  is provided at the outer edge of the trapezoidal portion  124 , and a rectangular cut out  131  is formed at the upper edge of the triangular portion  126  and a mounting tab  132  is provided at the outer edge of the trapezoidal portion  127 . 
   Similarly, the extension portion extending sideway from the left edge  63  of the lower panel  19  includes a triangular portion  133  and a trapezoidal portion  134  divided by a common fold line  135 . A rectangular cut out  136  is formed at the upper edge of the triangular portion  133  and a mounting tab  137  is provided at the outer edge of the trapezoidal portion  134 . 
   The extension portion extending outwards from the right side edge of the panel  19  is divided into a triangular portion  138  and a trapezoidal portion  139  having a common fold line  140 . A rectangular cut out  141  is formed at the upper edge of the triangular portion  138  and a mounting tab  142  is provided at the outer edge of the trapezoidal portion  139 . 
   The shelving portion  11  of the display stand  10  of the second embodiment may be formed by first folding the first panel  14  upwards relative to the second panel  15  along the horizontal fold line  20  until they are perpendicular to each other. The extension portion  25  and  26  are folded upwards relative to the panel  15  until the triangular portions  114  and  116  are perpendicular to the panel  15  with the upper edge of the triangular portions  114  and  116  now facing rearward to abut with the side edges  38  and  41  respectively. The reinforcing side panels  107  and  108  are then folded forwards as shown in  FIG. 11  to cover over the triangular portions  114  and  116  respectively. The vertical slots  37  and  40  engage with the rectangular cut outs  119  and  121  to provide two vertical side mounting openings now facing sideways from the rear edge of the folded reinforcing side panels  107  and  108 . The triangular portions  113  and  117  may then be folded outwards along the fold lines  115  and  118  as best shown in  FIG. 12  to wrap over the already folded reinforcing side panels  107  and  108  and they may be mounted in place by bending the mounting tabs  120  and  122  to insert into the two vertical side mounting openings so as to provide the reinforced side walls  25  and  26  for panel  15 . 
   The reinforcing panel  105  may now be folded upwards relative to the panel  15  along the horizontal fold line  143  until it lies juxtaposed to the front portion of the under-surface of the panel  15  to provide reinforcement to the upper shelve of the display. 
   After the upper shelve has been formed as described above, the panel  16  is folded downwards relative to the reinforcing panel  105  along horizontal fold line  21  until panels  16  and  105  are perpendicular to one another. The panel  17  is then folded upwards relative to the panel  16  along horizontal fold line  22  until panels  16  and  17  are perpendicular to one another so that the panel  16  forms the vertical rear wall and the panel  17  formed the platform respectively of the second shelve of the display  10 . The reinforced side wall of the second shelve are formed by first folding the triangular portions  123  and  126  of the side extension of the panel  17  upwards relative to the panel  17  along vertical fold lines  45  and  48  respectively until the triangular portions  123  and  126  are perpendicular to the panel  17  and their rear edges are in abutment with the now vertical panel  16 . The openings  43  and  46  now form two mounting openings along the rear edges of the second shelve. The reinforcing side panels  109  and  110  are then folded forwards to lie juxtaposed to the outer surface of the triangular portions  123  and  126  respectively and the cut outs  129  and  137  at the upper edges of the triangular portions  123  and  126  are aligned with the openings  43  and  46  respectively. The reinforced side walls of the second shelve are finally formed by folding the trapezoidal portions  124  and  127  downwards to wrap over the reinforcing side panels  109  and  110  respectively and the trapezoidal portions  124  and  127  are secured in the place by bending the mounting tabs  130  and  132  inwards to engage with the side openings  43  and  46  respectively. 
   The reinforcing panel  106  is then folded upwards relative to the panel  17  until it lies juxtaposed to the front portion of the under-surface of the panel  17  to provide the reinforcement for the second shelve of the display. 
   The lower shelve may now be formed in the manner similar to the second shelve by first folding the panel  18  forwards relative to the reinforcing panel  106  along the horizontal fold line  145  until they are perpendicular to one another and the panel  18  will be positioned vertically to form the rear wall of the lower shelve. The panel  19  is then folded forwards relative to the panel  18  along horizontal fold line  24  until they are perpendicular to one another. The triangular portions  133  and  138  of the side extensions of panel  19  are folded upwards along fold lines  63  and  66  respectively until they are perpendicular to the panel  19  and their rear edges contact the side edges of the panel  19 . The reinforcing panels  111  and  112  are folded forwards to lie in contact with the outside surface of the triangular portions  133  and  138  respectively and the openings  49  and  51  aligned with the cut outs  136  and  141  respectively form two side mounting openings at the rear edge of the shelve. The trapezoidal portions  134  and  139  are folded along fold lines  135  and  140  respectively to wrap over the reinforcing panels  111  and  112  respectively and they are secured in place by bending the mounting tabs  137  and  142  to engage with the side openings  49  and  51 . 
   The reinforcing shelving  11  is mounted to the support base  12  in the manner similar to the first embodiment described above. Since all exposed surfaces of the shelving of this embodiment are formed by the same front surface of the shelving configuration provided on the cardboard, decorative material such as print or color may be simply provided on the single front surface of the configuration. 
   A third embodiment of the shelving portion  11  having full reinforcement of its various parts is shown in  FIGS. 13 through 16 . In this embodiment, A vertical reinforcement panel  146  is provided for reinforcing the panel  14  so as to form a reinforced vertical rear wall of the upper shelve of the shelving portion  11 . The reinforcement panel  146  is formed in the configuration by an additional rectangular panel extending upwards from the upper edge  161  of the panel  14  as best shown in  FIG. 14  so that the upper edge  161  provides a horizontal fold line between the reinforcing panel  146  and panel  14 . Two mounting tabs  147  and  148  are formed at the upper free edge of the reinforcing panel  146 . Two horizontal slot openings are formed in panel  15  along the horizontal fold line  20 . Vertical slot openings  153 ,  154 ,  157 ,  158 ,  162  and  163  are formed in panels  15 ,  17  and  19  respectively along their side edges. Mounting tabs  151  and  152  are formed at the outer edge of the triangular portions  113  and  117  respectively of the side extension portions of the panel  15  and mounting tabs  155 ,  156 ,  159  and  160  are formed at the lower edge of the trapezoidal portions  124 ,  127 ,  134  and  139  respectively. 
   The upper shelve of the third embodiment is formed by first folding the reinforcement panel  146  forwards along the horizontal fold line  161  until it lies in front and in contact with the panel  14  to form the reinforced rear wall of the upper shelve. The reinforcement panel  146  is maintained in place by engaging the mounting tabs  147  and  148  with the horizontal mounting openings  149  and  150  respectively in the panel  15  as best shown in  FIG. 16 . The panel  15  is then folded upwards relative to the panel  14  until the two panels  14  and  15  are perpendicular to one another. The reinforcing side panels  107  and  108  are folded forwards until they are perpendicular to both the panels  14  and  15  and are aligned with the side edges of the panel  15 . The triangular portions  114  and  116  of the side extension portions of the panel  15  are folded upwards until they are in contact with the outer surface with the reinforcement side panels  107  and  108  respectively. The reinforced side walls of the upper shelve may then be formed by folding the triangular portions  113  and  117  inwards to wrap over the reinforcing side panels  107  and  108  respectively and they are secured in this mounted position by engaging the mounting tabs  151  and  152  with the vertical slot openings  153  and  154  respectively. 
   The reinforcing panel  105  is folded to lie underneath the front portion of the panel  15  similar to the second embodiment above to provide the reinforcement for the upper shelve. 
   The rear wall and the platform of the second shelve are formed by folding the panel  16  relative to reinforcing panel  105  to form its vertical rear wall and panel  17  relative to panel  16  to form its horizontal platform. 
   The reinforced side walls are formed by first folding the reinforcing side panels  109  and  110  forwards until they are perpendicular to both panels  16  and  17  and are aligned with the side edges of the panel  17  respectively. The triangular portions  123  and  126  are then folded upwards relative to the side edges of the panel  17  until they are in contact with the outer surface of the reinforcing side panels  109  and  110 . The trapezoidal portions  124  and  127  are folded inwards to wrap over the reinforcing side panels  109  and  110  and they are secured in place by engaging the mounting tabs  155  and  156  with the mounting openings  157  and  158  respectively. 
   The horizontal reinforcing panel  106  is folded upwards until it lies in contact with the undersurface of the front portion of the panel  17  to provide the reinforcement of the second shelve. 
   The rear wall and the horizontal platform of the lower shelve are formed by folding the panel  18  relative to reinforcing panel  106  along horizontal fold line  145  and also by folding the panel  19  relative to panel  18  along fold line  24  similar to that in the second embodiment as described above. 
   The reinforced side walls of the lower shelve are formed in the manner similar to the side walls of the second shelve by first folding the reinforcing side panels  111  and  112  forwards until they are perpendicular to both panels  18  and  19  and are aligned with the side edges of the panel  19 . The triangular portions  133  and  138  are folded upwards along the side edges of panel  19  until they lie in contact with the outer surface of the reinforcing side panels  111  and  112 . The trapezoidal portions  134  and  139  are then folded inwards to wrap over the reinforcing side panels  111  and  112 , and they are secured in place by engaging the mounting tabs  159  and  160  with the mounting openings  162  and  163  respectively. 
   An additional panel  164  is formed in the configuration extending outwards from the lower edge  165  of the panel  19 . This additional panel  164  is folded downward until it lies underneath the front portion of the panel  19  and it may be secured to the panel  19  with adhesive so as to provide the reinforcement of the lower shelve. 
   While the present invention has been shown and described in the preferred embodiments thereof, it will be apparent that various modifications can be made therein without departing from the spirit and essential attributes thereof, and it is desired therefore that only such limitations be placed thereon as are imposed by the appended claims.