Patent ID: 7383923

Claim:
An elevating load platform comprising a base member and a load supporting member interconnected by a linkage assembly that facilitates vertical movement of the load supporting member generally parallel to the base member, and a plurality of coil springs positioned to urge the load supporting member upwardly relative to the base member so that when the load supporting member is laden, the coil springs are compressed, and as the load is progressively removed, the coil springs urge the load supporting member upwardly to thereby maintain the load supporting member at a desired height, the linkage assembly comprising a pair of spaced scissor linkages interconnected by a central cross-member, each scissor linkage comprising two crossed arms pivotally secured together at the centers thereof by the cross-member, the plurality of compression springs being positioned in a spaced array interposed between the base member and the cross-member, and a linkage coupled between the base member and the cross member to cause the cross-member to axially pivot as the load supporting member moves vertically so as to ensure constant alignment of the springs with the base member and cross-member.