Abstract: A placement rack includes a rear frame, two side plates pivotally connected with the rear frame, a front panel pivotally connected with the two side plates, and a bottom plate pivotally connected with the rear frame and abutting the front panel. Thus, the placement rack can be folded to have a smaller volume to decrease the cost in packaging, storage and transportation of the placement rack.

Abstract: A computer table includes a frame assembly, a board assembly detachably mounted on the frame assembly, and a shelf detachably mounted on the frame assembly. The frame assembly includes two side frames each pivotally connected with a rear frame. The board assembly includes a plurality of connecting posts each mounted between a support board and a movable board. The shelf includes two connecting brackets each pivotally connected with a support plate and each detachably mounted on a respective one of the two side frames. Thus, the frame assembly, the board assembly and the shelf are detached from each other and are folded individually so that the computer table can be detached and folded to have the minimum volume so as to decrease the cost of packaging, storage and transportation of the computer table.

Abstract: A computer table includes a board assembly including a support board, a movable board pivotally connected with the support board by two elastic fastening members and two connecting members, and two fixing brackets each mounted on the support board and each connected with a respective one of the two elastic fastening members. Thus, the movable board is movable to space from the support board and is movable to abut the support board so that the board assembly is expanded for use with a user and can be folded when not in use to have a smaller volume.

Abstract: A shelf includes a rear frame, two side frames pivotally mounted on two opposite ends of the rear frame respectively, two connecting frames each detachably mounted on the rear frame and each located between the two side frames to locate the two side frames, and at least one placement board mounted between and supported by the rear frame and the two side frames. Thus, the shelf can be folded to have a smaller volume so as to decrease the cost of packaging, storage and transportation of the shelf.

Abstract: A ladder assembly includes a ladder, two wheel carriers mounted on the ladder movably and rotatably, two wheels each rotatably mounted on a respective one of the wheel carriers, two fastening members each extended through a respective one of the wheel carriers and each secured on the ladder to attach the respective wheel carrier to the ladder, and a support rack pivotally mounted on the ladder. Thus, when the support rack and the wheels are expanded outward from the ladder, the ladder assembly can function as a carrier, and when the support rack and the wheels are folded onto the ladder, the ladder assembly can function as a ladder so that the ladder assembly both functions as a ladder and a carrier, thereby enhancing the versatility of the ladder assembly.

Abstract: A computer table includes a rear frame, two side frames pivotally mounted on two opposite ends of the rear frame respectively, a support board detachably mounted on the rear frame and the two side frames to support a computer, a drawer board detachably mounted between the two side frames, and a carrier detachably mounted on one of the two side frames to support a host frame of the computer. Thus, the computer table can be folded to have a smaller volume to decrease the cost of packaging, storage and transportation of the computer table.