Drive system for vertical mast personnel lift

Details Drive system for vertical mast personnel lift Drive system for vertical mast personnel lift

1996-01-18

1998-04-21

Noland, Kenneth

Elevator, industrial lift truck, or stationary lift for vehicle

Industrial lift truck or required component thereof

Having structure allowing propulsion or steering by walking...

180 655, B66F 906

Patent

active

057408874

ABSTRACT:
A drive system for a vertical mast personnel lift uses a pair of rear wheels that are fixed in an axial direction of a base portion of the personnel lift. When an operator input to make a turn is received, DC motors respectively connected to the right and left rear wheels are rotated at a different rate. Neither the front wheels nor the rear wheels are steered during the turning movement. The front wheels are configured as caster wheels, which are free to turn in any direction. In order to rotate the personnel lift about its central axis, the right rear wheel is rotated at a first rate in a first direction, and the left rear wheel is rotated at the first rate in a second direction opposite the first direction.

REFERENCES:
patent: 3817346 (1974-06-01), Wehmeyer
patent: 4258825 (1981-03-01), Collins
patent: 4375840 (1983-03-01), Campbell
patent: 4511015 (1985-04-01), Purdy
patent: 4683973 (1987-08-01), Honjo et al.
patent: 5174593 (1992-12-01), Chapman
patent: 5203425 (1993-04-01), Wehmeyer
patent: 5222568 (1993-06-01), Higasa et al.
patent: 5547038 (1996-08-01), Madwed

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