Packaging box assembly with a changeable size

Abstract

A packaging box assembly includes a base plate, a middle plate set and a cover plate. The base plate has a central wall, and a plurality of lateral walls extending from the central wall. The lateral walls are foldable along fold lines to define a receiving space with the central wall. The middle plate set is placed within the receiving space and is changeable between a cushioning position in which the middle plate set is parallel to the central wall, and an assembled position in which the middle plate set is perpendicular to the central wall. When the middle plate set is in the cushioning position, the cover plate is placed on top of the base plate. When the middle plate set is in the assembled position, the cover plate is placed on the middle plate set. Thus, various modular configurations are formed to change the size of the box assembly.

1 . A packaging box assembly comprising:
 a base plate having a central wall, a plurality of lateral walls extending respectively from lateral ends of said central wall, and a plurality of fold lines, said fold lines being formed between said central wall and said lateral walls and in said lateral walls so that said base plate is foldable to form a receiving space defined by said central wall and said lateral walls;   a middle plate set disposed within said receiving space and changeable between a cushioning position in which said middle plate set is disposed parallel to said central wall, and an assembled position in which said middle plate set is perpendicular to said central wall; and   a cover plate to close said receiving space, said cover plate being positioned on top of said lateral walls of said base plate when said middle plate set is in said cushioning position, said cover plate being positioned on top of said middle plate set when said middle plate set is in said assembled position.   
   
   
       2 . The packaging box assembly of  claim 1 , wherein said central wall of said base plate has a plurality of first engaging holes proximate to said lateral walls, said lateral walls including two opposite first and second lateral walls, and two opposite third and fourth lateral walls, each of said third and fourth lateral walls having a plurality of spaced apart second engaging holes, every two of said second engaging holes in each of said third and fourth lateral walls being aligned with each other, each of said lateral walls further having one lateral end which is distal from said central wall and which has at least one connecting tab projecting therefrom, wherein, after each of said lateral walls is folded, said connecting tab in each of said lateral walls can be inserted into a respective one of said first engaging holes, and said every two of said second engaging holes can be placed one above the other. 
   
   
       3 . The packaging box assembly of  claim 2 , wherein said first, second, third and fourth lateral walls are each divided by two of said fold lines into a first region proximate to said central wall, a second region distal from said central wall, and a connection region between said first and second regions, said connecting tab being disposed at a longitudinal side of said second region of each of said lateral walls and being aligned with a respective one of said first engaging holes. 
   
   
       4 . The packaging box assembly of  claim 3 , further comprising a handle, said connection region of said first lateral wall of said base plate having two spaced apart fastening holes, said handle being fixed in said fastening holes. 
   
   
       5 . The packaging box assembly of  claim 2 , wherein each of said first and second lateral walls of said base plate has two wing plates respectively provided at two opposite ends of each of said first and second regions of said first and second lateral walls, said wing plates respectively having third engaging holes proximate to said first and second regions of said first and second lateral walls, said second regions of said third and fourth lateral walls of said base plate having lateral connecting plates projecting therefrom proximate to the respective ones of said wing plates, whereby, after said lateral walls of said base plate are folded, said third engaging holes in two adjacent ones of said wing plates are communicated with each other to permit insertion of a respective one of said lateral connecting plates therein. 
   
   
       6 . The packaging box assembly of  claim 5 , wherein said cover plate has a central wall, a plurality of lateral walls extending respectively from lateral ends of said central wall of said cover plate, and a plurality of fold lines, said fold lines of said cover plate extending between said central wall of said cover plate and said lateral walls of said cover plate and in said lateral walls of said cover plate, said central wall and said lateral wall of said cover plate being foldable along said fold lines of said cover plate to define a space. 
   
   
       7 . The packaging box assembly of  claim 6 , wherein said central wall of said cover plate has a plurality of first engaging holes proximate to said lateral walls of said cover plate, said lateral walls of said cover plate including two opposite first and second lateral walls, and two opposite third and fourth lateral walls, each of said third and fourth lateral walls of said cover plate having a plurality of spaced apart second engaging holes, every two of said second engaging holes in said third and fourth lateral walls of said cover plate being aligned with each other, each of said lateral walls of said cover plate further having one lateral end which is distal from said central wall of said cover plate and which has at least one connecting tab projecting therefrom, wherein, after each of said lateral walls of said cover plate is folded, said connecting tab of said cover plate in each of said lateral walls of said cover plate can be inserted into a respective one of said first engaging holes of said cover plate, and said every two of said second engaging holes of said cover plate can be placed one above the other. 
   
   
       8 . The packaging box assembly of  claim 7 , wherein said middle plate set includes two inner middle plates of identical shape, each of said inner middle plates having at least one first limit plate projecting from a longitudinal edge of each said inner middle plate proximate to one end of said longitudinal edge, and at least one second limit plate projecting from said longitudinal edge proximate to the other end of said longitudinal edge, wherein, when said inner middle plates are in said cushioning position, each of said first limit plates of said inner middle plates extends between a respective one of said first regions and a respective one of said second regions of said third and fourth lateral walls of said base plate, and said second limit plates of said inner middle plates extend respectively into said second engaging holes in said base plate. 
   
   
       9 . The packaging box assembly of  claim 8 , wherein each of said inner middle plates further has a first linking plate that projects from one end of each said inner middle plate proximate to said first limit plate, and a first connecting hole proximate to the first linking plate. 
   
   
       10 . The packaging box assembly of  claim 8 , wherein said middle plate set further includes two outer middle plates of identical shape, each of said outer middle plates having a plurality of fold lines, a second linking plate projecting from one end of each said outer middle plate and having a second connecting hole, third and fourth linking plates which are formed respectively at the other end of each said outer middle plate and at a middle section of each said outer middle plate and which are turnable and foldable, and at least one third limit plate and at least one fourth limit plate, both of which project from a longitudinal side of each said outer middle plate in a spaced-apart relationship. 
   
   
       11 . The packaging box assembly of  claim 8 , wherein each of said outer middle plates includes a plurality of split lines, a second linking plate projecting from one end of each said outer middle plate and having a second connecting hole, third and fourth linking plates which are formed respectively at another end and at a middle section of each said outer middle plate through the provision of said split lines and which are turnable and foldable, and third and fourth limit plates both projecting from a longitudinal end of each said outer middle plate in a spaced apart relationship. 
   
   
       12 . The packaging box assembly of  claim 11 , wherein each of said inner middle plates further has a middle part provided with a linking hole for insertion of said fourth linking plate of a respective one of said outer middle plates. 
   
   
       13 . The packaging box assembly of  claim 11 , wherein said cover plate further has first and second split lines, a fifth linking plate formed adjacent to a juncture between said central wall and said first lateral wall of said cover plate by using said first split line, and a sixth linking plate formed in said central wall of said cover plate and away from said fifth linking plate by using said second split line. 
   
   
       14 . The packaging box assembly of  claim 13 , further comprising an auxiliary cover plate connected to one of said lateral walls of said base plate and one of said lateral walls of said cover plate which is at the same side as said one of said lateral walls of said base plate, said auxiliary cover plate having a plurality of elongated slots for insertion of said sixth linking plate. 
   
   
       15 . The packaging box assembly of  claim 14 , wherein said auxiliary cover plate further has a plurality of fold lines that divide said auxiliary cover plate into a central area, and first, second, third and fourth lateral areas that are formed around said central area, said elongated slots being formed in said central area, said second lateral area having a width larger than that of said first lateral area, said second lateral area being attachable to said one of said lateral walls of said base plate and said one of said lateral walls of said cover plate at said same side, said third and fourth lateral areas being symmetrical to each other and respectively having projecting engaging plates, said engaging plates being respectively insertable into said second engaging holes of said cover plate, said first lateral area being foldable to abut against said cover plate. 
   
   
       16 . The packaging box assembly of  claim 13 , wherein said base plate further has an ear part projecting from said second region of said first lateral wall of said base plate, and an opening formed in said ear part, said cover plate further has an insert hole formed in said first lateral wall of said cover plate proximate to said central wall of said cover plate, said ear part of said base plate is insertable into said insert hole of said cover plate, and said fifth linking plate of said cover plate is insertable into said opening in said ear part, whereby said cover plate is assembled onto said base plate. 
   
   
       17 . The packaging box assembly of  claim 13 , wherein each of said first and second lateral walls of said cover plate has two wing plates respectively provided at two opposite ends of each of said first and second regions of said first and second lateral walls of said cover plate, said wing plates of said cover plate respectively having third engaging holes proximate to said first and second regions of said first and second lateral walls of said cover plate, said second regions of said third and fourth lateral walls of said cover plate having lateral connecting plates projecting therefrom proximate to the respective ones of said wing plates of said cover plate, whereby, after said lateral walls of said cover plate are folded, said third engaging holes in two adjacent ones of said wing plates of said cover plate are communicated with each other to permit insertion of a respective one of said lateral connecting plates of said cover plate therein. 
   
   
       18 . A packaging box assembly comprising:
 a base plate having a central wall, and a plurality of lateral walls extending perpendicularly from said central wall, said central wall and said lateral walls confining a receiving space;   a cover plate to close said receiving space, said cover plate having a central wall, and a plurality of lateral walls extending perpendicularly from said central wall of said cover plate, said central wall and said lateral walls of said cover plate confining another receiving space; and   a middle plate set including inner middle plates interlockable with said base plate to extend perpendicularly on said central wall of said base plate and to abut against inner surfaces of said lateral walls of said base plate, and outer middle plates interlockable with said cover plate to extend perpendicularly on said central wall of said cover plate and to abut against inner surfaces of said lateral walls of said cover plate, said inner and outer middle plates being higher than said lateral walls of said base plate and said cover plate, respectively,   wherein, when said inner and outer middle plates interlock with said base plate and said cover plate, said outer middle plates can be sleeved around said inner middle plates to form a first box configuration, and   wherein, when said inner and outer middle plates are separated from said lateral walls of said base plate and said cover plate, said lateral walls of said cover plate can rest on top ends of said lateral walls of said base plate, respectively, to form a second box configuration.   
   
   
       19 . A packaging box assembly comprising:
 a base plate having a central wall, and a plurality of lateral walls extending substantially perpendicularly from said central wall, said central wall and said lateral walls confining a receiving space above said central wall; and   a plurality of inner middle plates disposed perpendicularly on said central wall and abutting against inner surfaces of said lateral walls, said inner middle plates being higher than said lateral walls, at least one of said inner middle plates interlocking releasably with said base plate.   
   
   
       20 . The packaging box assembly of  claim 19 , wherein said lateral walls include two opposite first and second lateral walls, and two opposite third and fourth lateral walls, each of said lateral walls being divided into a first region proximate to said central wall, a second region distal from said central wall, and a connection region between said first and second regions, said first region being foldable to extend substantially perpendicularly relative to said central wall, said second region being foldable backward over said first region to extend to said central wall, said connection region extending in a plane substantially parallel to said central wall. 
   
   
       21 . The packaging box assembly of  claim 20 , wherein at least one of said inner middle plates has a first limit plate extending adjacent to said central wall and foldable to extend between and to interlock with said first and second regions of one of said lateral walls. 
   
   
       22 . The packaging box assembly of  claim 20 , wherein at least one of said inner middle plates has a second limit plate projecting therefrom, said base plate further having at least one engaging hole formed in one of said lateral walls, said second limit plate interlocking with said engaging hole. 
   
   
       23 . The packaging box assembly of  claim 20 , wherein at least one of said inner middle plates has a second limit plate projecting therefrom proximate to said central wall, said base plate further having an engaging hole formed in said first region of one of said lateral walls and another engaging hole formed in said connection region of said one of said lateral walls, said second limit plate extending outward through said engaging hole in said first region and being inserted into said another engaging hole in said connection region.