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 Title: |
US4222449:
Step-climbing wheel chair
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Feliz, Jack M.; Palm Springs, CA 92262
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| Assignee: |
None
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| Published / Filed: |
1980-09-16
/ 1978-06-08
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| Application Number: |
US1978000913549
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| IPC Code: |
Advanced:
A61G 5/06;
IPC-7:
A61G 5/04;
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| ECLA Code: |
A61G5/06; K61G5/04A6; K61G5/10S14;
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| U.S. Class: |
Current:
180/008.2;
280/005.2;
280/DIG.010;
Original:
180/008.A;
280/005.2;
280/DIG.10;
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| Field of Search: |
180/009,8 A,5.2,5.22,5.24,5.28,DIG. 10
305/006
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| Priority Number: |
| 1978-06-08 |
US1978000913549 |
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| Abstract: |
An improved step-climbing wheel chair with integral retractable ramps for ascending or descending a step, curb or the like. The conveyance is provided with a two-speed transmission capable of driving the wheel chair on level terrain at conventional speeds or selecting a low speed high torque capability for driving the conveyance up an inclined ramp. The invention further contains a self-leveling chair seat which automatically maintains the occupant in a level seated position regardless of the inclined position assumed by the wheel chair frame, thereby contributing to the stability of the wheel chair and the safety of the occupant.
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| Attorney, Agent or Firm: |
Harris, Kern, Wallen & Tinsley ;
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| Primary / Asst. Examiners: |
Pekar, John A.;
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| Family: |
None
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First Claim:
Show all 6 claims |
I claim as my invention:
1. In a wheel chair for ascending and descending a step, curb or the like, the combination of:
- a frame with castor wheels and drive wheels mounted thereon;
- a pair of elongate substantially flat ramps;
- a foldable, extendable and retractable ramp supporting assembly carrying said ramps and pivotally mounted on said frame;
- a self-leveling seat pivotally mounted on said frame;
- a first power drive means interconnecting said chair and frame and automatically energized to maintain the said seat in a level position regardless of an inclined position assumed by said frame;
- a control means carried on said ramp supporting assembly for extending, positioning, retracting and folding said ramps relative to said frame for traverse by said castor and drive wheels; and
- a second power drive means mounted on said frame and including a multi-speed transmission for driving said drive wheels on level terrain at conventional speeds and at a low speed with high torque up said ramps and functioning as a speed restraint while descending said ramp.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 80 U.S. patent(s) that reference this one
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