Patent ID: 7942244

Claim:
A modular lifting assembly comprising: a first rack mast, a platform capable of moving vertically along the first rack mast; a first power unit mounted onto the first rack mast and controlling a vertical movement of the platform along the first rack mast, the first power unit comprising a plurality of modular elements, the modular elements including: a first motor block having an upper side and a lower side, the upper side forming a substantially flat upper surface defining a plurality of upper holes, the lower side forming a substantially flat lower surface defining a plurality of lower holes and; an upper roller box including an upper side forming a substantially flat upper surface and defining a plurality of upper holes, a lower side forming a substantially flat lower surface and defining a plurality of lower holes coinciding with the upper holes of the upper roller box and the upper and lower holes of the motor block, and a lateral side forming a substantially flat lateral surface and defining a plurality of lateral holes; a lower roller box substantially the same as the upper roller box, such that the first and the second roller boxes are interchangeable; wherein the lower surface of the upper roller box is held adjacent the upper surface of the upper side of the first motor block with a plurality of upper fasteners inserted through the coinciding plurality of holes of the lower side of the upper roller box and the upper side of the first motor block such that the upper roller box is removably interlocked with the first motor block, and an upper surface of the lower roller box is held adjacent the lower surface of the lower side of the first motor block with a plurality of lower fasteners inserted through a coinciding plurality of holes of an upper side of the lower roller box and the lower side of the first motor block such that the lower roller box is also removably interlocked with the first motor block.