Worm gear assembly for a medical mobility apparatus permitting m

Details Worm gear assembly for a medical mobility apparatus permitting m Worm gear assembly for a medical mobility apparatus permitting m

1997-08-27

2000-02-29

Ellis, Christopher P.

Motor vehicles

Power

Electric

180907, 2802501, 74425, B60K 100

Patent

active

060297638

ABSTRACT:
A worm gear assembly for a medical mobility apparatus, such as a motorized wheelchair or scooter, comprises a worm and a worm gear. The worm is operatively coupled to a motor shaft of a drive motor of the medical mobility apparatus. The worm gear, which is disposed on an intermediate shaft, is adapted for being driven by the worm and is adapted for driving a drive wheel of the medical mobility apparatus. The worm gear and the worm have a gear ratio of less than 10:1 and the worm has a lead angle in the range of about 20-30.degree.. This arrangement permits the worm gear to selectively drive the worm and permits manual reverse mobility of the medical mobility apparatus.

REFERENCES:
patent: 2310115 (1943-02-01), Popoff
patent: 3895700 (1975-07-01), Kerr
patent: 4226136 (1980-10-01), Porter
patent: 5042315 (1991-08-01), Fahy et al.
patent: 5275248 (1994-01-01), Finch et al.
patent: 5690185 (1997-11-01), Sengel

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