Patent ID: 7047738

Claim:
An apparatus for lifting an object while maintaining levelness of a support surface, comprising: at least two lift cylinder assemblies adapted to be connected to the support surface for lifting and lowering the support surface; a synchronizer having at least two isolated chambers corresponding to the at least two lift cylinder assemblies, a rod extending axially through the chambers, and pistons mounted on the rod with one of said pistons being located in each of the isolated chambers, the chambers including first and second passageways extending into opposite ends of each of the chambers; an axial passageway extending continuously through the rod and connected to the first passageways for communicating hydraulic fluid to each first passageway; a hydraulic pump; and a hydraulic circuit operably connecting the pump to the axial passageway of the synchronizer and to the second passageways of the synchronizer and to the at least two lift cylinder assemblies for controlling and providing synchronized movement of the at least two lift cylinder assemblies.