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United States Patent | 3,889,773 |
Chant | June 17, 1975 |
The invention provides an electric motorized unit for wheelchairs in which manual handling is facilitated by shifting a wheel hub driving gear axially over a key out of mesh with a gear driven by an electric motor so as to eliminate drag due to motor torque.
Inventors: | Chant; John Bernard (Alton, EN) |
Assignee: |
Vessa Limited
(Alton,
EN)
|
Appl. No.: | 05/439,750 |
Filed: | February 5, 1974 |
Feb 05, 1973 [GB] | 5640/73 | |||
Current U.S. Class: | 180/65.22 ; 180/65.31; 180/907; 74/405 |
Current International Class: | B60L 11/18 (20060101); B62M 7/12 (20060101); B62M 7/00 (20060101); B60k 001/00 () |
Field of Search: | 180/65R,7R,44E,DIG.3 74/405,414 192/70.24,70.23,93A,93B,93R |
2544831 | March 1951 | Guyton |
2586273 | February 1952 | Steven |
2618170 | November 1952 | Mulcahy |
3766795 | October 1973 | Priest |
3770073 | November 1973 | Meyer |
3786887 | January 1974 | Rosenthal et al. |
3800901 | April 1974 | Blomstrom et al. |