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 Title: |
US4566707:
Wheel chair
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Nitzberg, Leonard R.; Knoxville, TN 37919
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| Assignee: |
None
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| Published / Filed: |
1986-01-28
/ 1984-02-21
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| Application Number: |
US1984000582066
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| IPC Code: |
Advanced:
A61G 5/06;
B62D 55/075;
Core:
A61G 5/00;
B62D 55/00;
IPC-7:
B62D 57/02;
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| ECLA Code: |
A61G5/06A; A61G5/06C; B62D55/075; K61G5/04A6; K61G5/10S14;
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| U.S. Class: |
Current:
180/008.2;
180/008.7;
180/907;
280/005.22;
280/250.1;
280/DIG.010;
D12/001;
Original:
180/008.2;
180/008.7;
180/907;
280/005.22;
280/006.1;
280/242.WC;
280/DIG.10;
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| Field of Search: |
180/8.1,8.2,8.7,DIG. 3
280/5.2,5.22,6.1,242 WC,DIG. 10
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| Priority Number: |
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| Abstract: |
A mechanism for the transport of an object across relatively level surfaces as well as to ascend and descend stairways. The mechanism is described particularly with respect to a wheel chair for handicapped persons and is provided with a frame and a pair of support wheels on each side of the frame. A climbing chain with lugs is associated with each wheel on the frame; these chains being inclined at an angle providing a desired lifting height. The wheel chair is either powered by the occupant or by electrical or other corresponding power means. Appropriate sensing means on the frame ascertain a nonlevel condition in pitch or yaw during ascent or descent of the stairs whereby corrections are made in the driving means such that a level orientation is re-established. Braking is provided by appropriate gearing whereby an interruption of the driving power holds the climbing chains in their current position. In one embodiment, the mechanism is provided with means for selectively varying the relative rotational speed of the various climbing chains to facilitate the substantially simultaneous loading of each climbing chain. Specific embodiments of drive trains and climbing chains are described.
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| Attorney, Agent or Firm: |
Pitts and Brittian ;
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| Primary / Asst. Examiners: |
Peters, Jr., Joseph F.; Rice, Kenneth R.
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This invention is a continuation-in-part of U.S. patent application, Ser. No. 318,631, filed Nov. 5, 1981, and now U.S. Pat. No. 4,432,425 issued Feb. 21, 1984.
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| Family: |
Show 2 known family members
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First Claim:
Show all 17 claims |
I claim:
1. Apparatus for moving an object over substantially varying terrain, including stairs having stair treads, which comprises:
- a frame for supporting said object, said frame having opposite sides and a front portion and a rear portion;
- first wheel means mounted from said front portion of said frame having a front wheel proximate each side of said frame for engagement with said terrain;
- second wheel means mounted from said rear portion of said frame having a rear wheel proximate each side of said frame for engagement with said terrain;
- drive means connected to at least one of said first and said second wheel means for rotating corresponding of said wheels against said terrain;
- first level sensing means carried by said frame for continuously sensing any change in pitch of said frame from a pre-set pitch value;
- means responsive to said first level sensing means connected between said frame and at least one of said first and second wheel means for correcting said pitch to said pre-set pitch value;
- rotatable means carried by said frame for engaging said stair treads and for moving said frame ascending and descending said stairs, said rotatable means comprising a plurality of flexible endless members supported from said frame in a plane substantially perpendicular to said terrain, means for rotating said endless members, and stair tread engaging lugs attached to and extending outwardly from said endless members in said plane; and
- means for selectively varying the relative rotational speed of said flexible endless members to facilitate the positioning of said tread engaging lugs of said endless members in supportive contact with said stair treads.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 111 U.S. patent(s) that reference this one
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