Patent ID: 8308177

Claim:
A lift assembly adapted for installation on a vehicle having an electrical system, said lift assembly comprising: a support structure securable to the vehicle; a pair of parallel vertically extending geared tracks disposed on said support structure; a vertically moveable drive assembly, said drive assembly including: (a) a mounting structure; (b) a selectively reversible motor secured to said mounting structure and adapted to receive an electrical current from the electrical system of the vehicle whereby said motor can be powered; (c) a pair of gears respectively engaged with said tracks and rotatably supported on said mounting structure, said pair of gears being drivingly coupled with said motor wherein selective reversible operation of said motor selectively reversibly rotates said pair of gears and thereby selectively raises and lowers said mounting structure relative to said support structure; and (d) a moveable first tread secured to said mounting structure and adapted to support an operator whereby raising and lowering said mounting structure raises and lowers an operator positioned on said first tread.