Quick-assembly containing box

Abstract

A quick-assembly containing box formed by folding a cardboard includes a bottom board, left- and right-side boards extending from the periphery of the bottom board, and front- and rear-side boards folded inwardly onto the bottom board to define a half-folded state. When the left- and right-side boards are pushed from the outside to the inside and erected, four positioning pieces already folded and adhered to the left- and right-side boards can push the front- and rear-side boards in a forward direction to erect, so as to achieve the effect of assembling the containing box of a three-dimensional state quickly.

What is claimed is: 
     
         1 . A quick-assembly containing box, formed by folding a cardboard integrally, comprising a bottom board, a left-side board and a right-side board extending from both left and right sides of the bottom board respectively, and a front-side board and a rear-side board extending from both front and rear sides of the bottom board respectively, wherein each of the four corners at where the left- and right-side boards and the front- and rear-side boards are intersected has a linking piece, and each linking piece has an oblique crease extending diagonally from a junction of the left- and right-side boards and the front- and rear-side boards as a starting point to the outer side, so as to divide each linking piece into a first folding piece adjacent to the sides of the front- and rear-side boards and a second folding piece adjacent to the left- and right-side boards, characterized in that the outer side of each first folding piece has a positioning piece extending from the oblique crease towards the left or right side, and each positioning piece is disposed on the outer side of an adjacent second folding piece, and a cut line is formed between the positioning piece and the second folding piece and the cut line extends from the inside to the outside up to the oblique crease, so that each positioning piece can use the oblique crease as a baseline for folding in advance; and when the front- and rear-side boards are folded towards the bottom board into a half-folded state, the inner surfaces of the first and second folding pieces of each linking piece are stacked closely onto the adjacent left- and right-side boards respectively, and the outer surface of each already folded positioning piece is adhered and fixed to the left- and right-side boards; when the left- and right-side boards are pushed from the outside to the inside with respect to the bottom board to erect the left- and right-side boards, and the positioning piece of each linking piece is provided for pushing forward and erecting the front- and rear-side boards by the first folding piece. 
     
     
         2 . The quick-assembly containing box as claimed in  claim 1 , wherein each positioning piece is cut evenly with the left and right edges of the left- and right-side boards after the positioning piece is adhered and fixed to the inner surfaces of the left- and right-side boards. 
     
     
         3 . The quick-assembly containing box as claimed in  claim 1 , wherein the left- and right-side boards have a cover board extending outwardly from the left and right edges, and after the left- and right-side boards and the front- and rear-side boards are lifted and erected with respect to the bottom board, the two cover boards are reversely folded towards the inner surfaces of the left- and right-side boards and stacked onto the inner surfaces of the two corresponding first folding pieces and the two corresponding positioning pieces respectively to cover the two corresponding first folding pieces and the two corresponding positioning pieces. 
     
     
         4 . The quick-assembly containing box as claimed in  claim 1 , wherein the front- and rear-side boards have an auxiliary reinforcing board extending outwardly from the front and rear edges thereof, and the two auxiliary reinforcing boards are folded reversely and fixed to the inner surfaces of the corresponding front- and rear-side boards respectively. 
     
     
         5 . The quick-assembly containing box as claimed in  claim 4 , wherein both left and right edges of the two auxiliary reinforcing boards have a flap extending and fixing to the first folding piece of the corresponding side. 
     
     
         6 . The quick-assembly containing box as claimed in  claim 4 , wherein the outer edges of each cover board and each auxiliary reinforcing board have a side strip extending therefrom, and the side strip is inwardly folded and stacked onto the inner surfaces of the corresponding cover board and auxiliary reinforcing board before the containing box is folded, stacked, and assembled.