Abstract: A collapsible hanging shelf may include a plurality of shelf members and a hanging member. A shelf member includes more than one parallel placed connecting units and a shelf. A connecting unit include one pair of crossing bars and a control bar that connecting a shelf and one of the pair bar. A shelf member connected with at least two connecting units at the points of one end of the control bar and the cross point of crossing bars. Each shelf is placed with other shelf in a vertically parallel manner. Once the hanging shelf is hung on the door, it can be pulled down by gravity and stopped at a fully extended position without applying any external forces. When it is taken off from the door and put it on the ground, the shelf can be quickly collapsed into a space saving position under the control of gravity.

Abstract: An extendable, load-bearing structure has a main structure and a driving element. The main structure has at least one driving arm. The driving element is placed in connection with the driving arm to drive the extendable, load-bearing structure between first and second positions. The extendable, load-bearing structure has a lock mechanism, and a supporting structure. The supporting structure has at least one supporting arm that is shorter than the driving arm of the main structure. The supporting arm has at least two supporting-arm elements which are connected to each other by joints. The supporting-arm elements of the supporting arm are substantially in line when the extendable, load-bearing structure is in its second position. The lock mechanism is arranged to releasably lock the supporting-arm elements of the supporting arm in position when these are in line.

Abstract: A transportable, self-erecting, battery powered, vertical lift assembly includes a wheeled frame with a towing attachment mechanism. A linear guide member with an exterior roller chain member is pivotally secured to the frame. A carriage member with attached platform member is movably mounted to the linear guide member adjacent the frame. The carriage member includes an attached drive mechanism with a battery powered DC motor driving a gear unit operatively connected to a sprocket, which engages the roller chain member on the linear guide member. The carriage member and attached platform member are movable along the linear guide member by the drive mechanism to pivot and elevate the guide member, which engages a vertical support structure, and to elevate the carriage member and attached platform member. A safety brake assembly immobilizes the carriage member with respect to the linear guide member upon relative movement between the carriage member and drive mechanism.