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 Title: |
US4794999:
Wheelchair and method of operating same
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hester, Robert; Shifnal, Shropshire, United Kingdom
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| Assignee: |
None
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| Published / Filed: |
1989-01-03
/ 1987-02-20
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| Application Number: |
US1987000025289
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| IPC Code: |
Advanced:
A61G 5/04;
A61G 5/06;
IPC-7:
B62B 9/06;
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| ECLA Code: |
A61G5/06A; A61G5/06B2;
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| U.S. Class: |
Current:
180/008.2;
180/907;
280/005.26;
280/DIG.010;
Original:
180/008.2;
180/907;
280/005.26;
280/DIG.10;
297/DIG.4;
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| Field of Search: |
280/DIG. 10,242 WC,656,5.2,5.26
180/907,6.5,8.1,8.2,8.3
297/DIG. 4
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| Priority Number: |
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| Abstract: |
PCT No. PCT/GB86/00367 Sec. 371 Date Feb. 20, 1987 Sec. 102(e) Date Feb. 20, 1987 PCT Filed Jun. 25, 1986 PCT Pub. No. WO87/00040 PCT Pub. Date Jan. 15, 1987.A wheelchair is adjustable between a compact configuration, in which the center of gravity lies in a vertical plane (50), which intersects wheels (16,116) on a front carrier of the wheelchair and an extended configuration in which the center of gravity lies in a vertical plane spaced substantially from all wheels of the wheelchair.
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| Attorney, Agent or Firm: |
Parmelee, Miller, Welsh & Kratz ;
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| Primary / Asst. Examiners: |
Mitchell, David M.; Diederiks, Jr., Everett G.
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH DE FR IT LI LU NL SE EP GB JP US
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| Family: |
Show 11 known family members
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First Claim:
Show all 8 claims |
I claim:
1. A wheelchair comprising a seat, front and rear parts of laterally spaced carriers, a plurality of wheels on each carrier, drive means for driving the carriers and at least some of said wheels, and control means for operating the drive means, wherein the front carriers are mounted for turning relative to the seat about a front axis, the rear carriers are mounted for turning relative to the seat about a rear axis, the wheels on each front carrier are spaced apart around the front axis, the wheels on each rear carrier are spaced apart around the rear axis, the rear axis is movable upwardly and downwardly relative to the front axis and to the seat, the drive means is arranged for driving said carriers about respective ones of the front and rear axes, the drive means includes means defining a plurality of alternative predetermined configurations of the wheelchair and is arranged for setting the carriers automatically in any selected one of said predetermined configurations, one of said configurations is a compact configuration, another of said predetermined configurations is an extended configuration, in the compact configuration with the wheelchair resting on a horizontal floor, at least one of said wheels on each of said front carriers engages the floor and intersects a vertical plane containing the centre of gravity of the wheelchair and, in the extended configuration of the wheelchair, with the wheelchair resting on the horizontal floor, the centre of gravity lies in a vertical plane spaced from all of said wheels on the front and rear carriers, and the control means includes a microprocessor, means for feeding instructions to said microprocessor for controlling the front and rear carriers and wheels, and the configuration of the wheelchair, and a plurality of transducers for providing electrical signals to the microprocessor to enable the microprocessor to determine the angular positions of the front and rear carriers.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| PCT Number: |
PCT/GB86/00367
WO8700040
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| PCT Pub./Filed Dates: |
1987-01-15 / 1986-06-25
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| § 371 / 102(e) Dates: |
1987-02-20 / 1987-02-20
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| Forward References: |
Show 65 U.S. patent(s) that reference this one
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