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 Title: |
US3823790:
POWER-OPERATED WHEEL CHAIR
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Richison, Eugene M.; Kinta, OK
Richison, Ethel M.; Kinta, OK
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| Assignee: |
Conklin; Thomas, Stigler, OK
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| Published / Filed: |
1974-07-16
/ 1973-02-12
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| Application Number: |
US1973000331908
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| IPC Code: |
Advanced:
A61G 5/06;
B62D 55/04;
B62D 55/075;
IPC-7:
B62B 9/02;
B62D 55/04;
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| ECLA Code: |
A61G5/06A; A61G5/06C; B62D55/04; B62D55/075; K61G203/14;
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| U.S. Class: |
Current:
180/006.7;
180/009.23;
Original:
180/006.7;
180/009.24;
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| Field of Search: |
180/6.7,9.24
280/5.22
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| Priority Number: |
| 1973-02-12 |
US1973000331908 |
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| Abstract: |
A power-operated wheelchair including selectively operated pairs of traction belt means driven by stub axles arranged on a central horizontal axis extending transversely of the chair with a forward pair of the traction belt means normally disposed horizontally and a rearward pair of the traction belt means normally disposed in a horizontal and rearwardly upward inclined plane. The wheelchair is normally supported on a horizontal surface by a pair of forward wheels and a rearward caster-type wheel. Control means, including gear trains and motors, drives the traction belt means and positions the plane of the pivotally mounted wheelchair seat in a substantially horizontal plane when the wheelchair is ascending or descending a flight of stairs, or the like, while simultaneously retracting the caster wheel to a position above the depending horizontal plane of the rearward pair of traction belt means.
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| Attorney, Agent or Firm: |
Rhea, Robert K. ;
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| Primary / Asst. Examiners: |
Johnson, Richard J.;
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| Family: |
None
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First Claim:
Show all 5 claims |
We claim:
1. A power-driven wheelchair, comprising:
- a main frame including parallel cross members connecting horizontally aligned side members having forward ends and terminating rearwardly in parallel transversely aligned angularly upward and rearwardly directed end portions;
- a chair frame pivotally supported by said main frame for pivoting movement about a horizontal axis toward and away from the rearward end portion of said main frame;
- a pair of stud axles journalled by said main frame intermediate its ends and respectively projecting, at one end portion, laterally of said frame side members;
- a sub frame underlying the forward end portions of said main frame side members and being pivotally connected with said main frame for vertical pivoting movement of said sub frame about a horizontal axis intermediate the length of said main frame;
- two pairs of endless traction belt means supported respectively by said main frame and said sub frame and driven by the respective laterally projecting end portion of said stub axles;
- a pair of ground-engaging wheels connected, respectively, with the forward end portions of said sub frame;
- a pivoting frame connected with said main frame rearwardly of said stub axles for vertical pivoting movement about a horizontal axis;
- a caster wheel connected with said pivoting frame rearwardly of its connection with said main frame for normally horizontally supporting said endless traction belt means, in combination with said ground-engaging wheels, in a plane spaced above said ground;
- chair frame retractor means connected with said chair frame and said pivoting frame, respectively, for lowering said chair frame toward said main frame while raising said pivoting frame and vice versa; and,
- selectively operable power means connected in driving relation with said stub axles.
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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 8 U.S. patent(s) that reference this one
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