Collapse and expansion structure of storage box

Abstract

A collapse and expansion structure of storage box includes a rectangular box body, multiple support boards, and a bottom board. The rectangular box body has two opposite first side walls and two opposite second side walls. The first and second side walls have lower ends connected to a flexible bottom surface and upper ends delimiting an opening. The first side walls are flexible and the second side walls are rigid. Each support board has an edge connected to an upper edge of the respective first side wall to make the support board rotatable with respect to the first side wall. The support boards have a length substantially equal to height of the first side walls. When positioned against the flexible first side walls, the support boards expand and support the box body. When rotated to a horizontal condition, the support boards allows of collapse of the box body.

1 . A collapse and expansion structure of storage box, comprising a rectangular box body, a plurality of support boards, and a bottom board, wherein the rectangular box body comprising a pair of first side walls that are respectively set on two opposite sides and a pair of second side walls respectively located on the other two opposite sides, the two first side walls and the two second side walls having lower ends connected to a flexible bottom surface, the two first side walls and the two second side walls having upper ends delimiting an opening, the two first side walls being flexible, the two second side walls being rigid, each of the support boards having an edge that is connected to an upper edge of each of the flexible first side walls to make the support board rotatable with respect to the first side wall, the support boards having a length that is substantially equal to height of the first side walls, whereby the support boards, when positioned against the flexible first side walls, expand and support the box body and the support boards, when being rotated to a horizontal condition, allows of collapse of the box body. 
     
     
         2 . The collapse and expansion structure of storage box according to  claim 1 , wherein the bottom board has an edge that is connected to an edge of one of the support boards that is opposite to the edge connected to the box body. 
     
     
         3 . The collapse and expansion structure of storage box according to  claim 1 , wherein the box body comprises four flexible side walls, the four side walls having lower edges that are connected to a flexible bottom surface, each of the support boards having an edge connected to an upper edge of each of the side walls of the box body to make the support board rotatable with respect to the side wall, the support boards having a length hat is substantially equal to height of the side walls, whereby the support boards, when respectively positioned against the side walls, erect and support the flexible side walls and the support boards, when being rotated to a horizontal condition, allowed of collapse of the box body into a flat condition.