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 Title: |
US3955639:
Wheel chairs
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Cragg, Harold; Birmingham, United Kingdom
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| Assignee: |
The Spastics Society, London, United Kingdom
other patents from SPASTICS SOCIETY (534865) (approx. 3)
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| Published / Filed: |
1976-05-11
/ 1974-12-04
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| Application Number: |
US1974000529561
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| IPC Code: |
Advanced:
A61G 5/04;
B60G 11/23;
B60K 1/02;
B60K 17/14;
B62D 11/02;
C04B 2/10;
A61G 5/08;
A61G 5/10;
Subclass:
A61G;
IPC-7:
B62D 11/04;
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| ECLA Code: |
A61G5/04A6; B60G11/23; B62D11/02; C04B2/10; K61G5/08A2; K61G5/10Z1; K61G203/14; L60G204/30;
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| U.S. Class: |
Current:
180/006.5;
180/065.51;
180/907;
Original:
180/006.5;
180/065.F;
180/DIG.3;
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| Field of Search: |
180/6.5,19 R,65 R,65 F,66 F,56,58,59,60,11,25 R,27,DIG. 3
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| Priority Number: |
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| Abstract: |
A wheel chair having electric driving means arranged to drive the rear wheels of the chair, each rear wheel and its associated electric driving means is supported by a wheel plate connected to the wheel chair frame by a resilient mounting embodying a suspension media providing independent suspension for the rear wheels. The electric driving means comprises one electric motor for each rear wheel with drive transmission to the associated wheel.
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| Attorney, Agent or Firm: |
Imirie, Smiley & Linn ;
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| Primary / Asst. Examiners: |
Song, Robert R.; Pekar, John A.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Parent Case: |
CROSS REFERENCE TO RELATED APPLICATION
This is a division of application Ser. No. 308,790 filed Nov. 22, 1972, now U.S. Pat. No. 3,901,337, issued Aug. 26, 1975.
BACKGROUND OF THE INVENTION
This invention is concerned with improvements in or relating to a wheel chair embodying electric driving means.
Many different forms of electric driving means for wheel chairs have already been proposed and certain proposals have been used. Many forms of electric drive now in use embody power transmissions including belts. Because of various factors, such belts can be hazardous to invalid users, and in fact the use of power driven wheel chairs with belt transmission is precluded in certain countries. To avoid this problem there have been various proposals to provide a direct form of drive transmission from an electric motor instead of belts. However, these proposals have not been acceptable because the wheel chairs have been so cumbersome, bulky and heavy, or the driving arrangement has been so complicated and such that when a power failure or other fault has developed, it has not been possible for the wheel chair to be manually propelled either by the invalid or an ambulant person.
SUMMARY OF THE INVENTION
An object of this invention is to provide an improved form of wheel chair having electric driving means attempts to overcome the foregoing disadvantages, and to provide a simple, inexpensive arrangement with adequate versatility for use with different designs of wheel chairs.
According to this invention, I provide an electrically driven wheel chair comprising a foldable frame supported on two pairs of wheels, the rear pair of said wheels being independently driven by electric driving means comprising an electric motor for each wheel of said rear pair, and battery power means connected to said electric motor through operable control means, a pair of wheel plates each supporting one of said rear wheels and said electric motor associated therewith, mounting means connected to said frame and mounting one of said wheel plates for resilient movement of said one wheel plate together with said one rear wheel supported thereon independent of said frame.
Accordingly, this invention provides independent suspension on the two rear wheels of an electrically driven wheelchair.
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| Family: |
Show 11 known family members
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First Claim:
Show all 5 claims |
What is claimed is:
1. An electrically driven wheel chair comprising a foldable frame supported on two pairs of wheels, the rear pair of said wheels being independently driven by electric driving means comprising an electric motor for each wheel of said rear pair; and battery power means connected to said electric motor through operable control means, a pair of wheel plates each supporting one of said rear wheels and said electric motor associated therewith, mounting means connected to said frame and mounting independently each one of said wheel plates for pivotal resilient movement of each of said wheel plates together with said rear wheel supported thereon about a horizontal axis inependent of said frame.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 26 U.S. patent(s) that reference this one
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