US3901337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel chairs
Assignee: DUDLEY ALBERT EDWARD FREDERICK 43 WING ROAD LINSLADE LEIGHTON BUZZARD BEDS
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Filing: 1972-11-22
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Granted: 1975-08-26
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Expires: 1992-11-22
Abstract
Abstract In a wheel chair, electric driving means pivotally supported for movement between an operative driving position in which a wheel pinion and driven pinion are coupled, and an inoperative position in which the pinions are uncoupled leaving the wheel free for normal rotation free of any coupling to the electric driving means. Preferably the wheel and electric driving means is supported on the wheel chair frame by a resilient mounting embodying a suspension media providing independent suspension for the rear wheels.
Inventors
- 👤 Harold Cragg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:27
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/04; A61G5/041; A61G5/045; A61G5/08; A61G5/0808; A61G5/0816; A61G5/10; A61G5/1078; B; B60; B60G; B60G11/00; B60G11/22; B60G11/23; B62; B62D; B62D11/00; B62D11/02; C; C04; C04B; C04B2/00; C04B2/10; A61G2203/00; A61G2203/10; A61G2203/14; B60G2204/00; B60G2204/10; B60G2204/30; Y; Y10; Y10S; Y10S180/00; Y10S180/907; Y10T; Y10T74/00; Y10T74/19; Y10T74/19614
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
In a wheelchair, electric driving means comprising an electric motor, battery power means connected to said electric motor through control means, drive transmitting means cpupled to said electric motor and including an output shaft, a driven pinion on said output shaft, a fixed pinion engageable with said driven pinion, a wheel plate carrying said fixed pinion and supporting a rotatable wheel, a ground-engaging tire supported on said wheel, and said fixed pinion being disposed inwardly of said ground-engaging tire, a mounting bracket mounting said wheel plate on a frame member of the wheel chair, a bushing of said mounting bracket including a suspension media arranged to permit resilient movement of said wheel plate independent of said frame member, and means supporting said drive transmitting means on said wheel plate for relative pivotal movement between two extreme positions in the first of which said driven pinion and said fixed pinion are inter-engaged for driving said wheel on operation of said electric motor, and in the second of which said driven pinion is disengaged to permit free rotation of said wheel.
Claim 2
Dependent Claim
179 words
In a wheelchair, electric driving means comprising an electric motor, battery power means connected to said electric motor through control means, drive transmitting means cpupled to said electric motor and including an output shaft, a driven pinion on said output shaft, a fixed pinion engageable with said driven pinion, a wheel plate carrying said fixed pinion and supporting a rotatable wheel, a ground-engaging tire supported on said wheel, and said fixed pinion being disposed inwardly of said ground-engaging tire, a mounting bracket mounting said wheel plate on a frame member of the wheel chair, a bushing of said mounting bracket including a suspension media arranged to permit resilient movement of said wheel plate independent of said frame member, and means supporting said drive transmitting means on said wheel plate for relative pivotal movement between two extreme positions in the first of which said driven pinion and said fixed pinion are inter-engaged for driving said wheel on operation of said electric motor, and in the second of which said driven pinion is disengaged to permit free rotation of said wheel.
Claim 3
Dependent Claim
25 words
Electric driving means according to claim 1 wherein said mounting bracket includes a suspension pin connected to said wheel plate and mounted in said bushing.
Claim 4
Dependent Claim
32 words
Electric driving means according to claim 1 wherein said means supporting said drive transmitting means also supports the electric motor, said supporting means comprising a plate pivotally mounted on said wheel plate.
Claim 5
Dependent Claim
35 words
Electric driving means according to claim 3 wherein said pivotal plate is movable between said first and second extreme positions by a manually operable cam shaft acting between said pivotal plate and said wheel plate.
Claim 6
Dependent Claim
33 words
Electric driving means according to claim 4 wherein said cam shaft is rotatably mounted on said wheel plate and carries a fixed cam engaging with a cam plate carried by said pivotal plate.
Claim 7
Dependent Claim
31 words
Electric driving means according to claim 5 wherein said cam plate includes a recess in which said fixed cam is seated engaging with cam faces on the sides of the recess.
Claim 8
Dependent Claim
44 words
Electric driving means according to claim 6 wherein said cam plate has a peripheral flange engageable with an operating handle of said cam shaft to clamp said wheel plate and pivotal plate together when said pivotal plate is in both of said extreme positions.
Claim 9
Dependent Claim
33 words
Electric driving means according to claim 7 wherein said peripheral flange has a taper engageable with said operating handle during movement of the handle between both extreme positions to release said clamping action.
Claim 10
Dependent Claim
52 words
Electric driving means according to claim 3 wherein said drive transmitting means includes a gear box carried by said pivotal plate, said gear box comprising said output shaft coupled to said electric motor by a worm wheel carRied on said output shaft and engaging with a worm driven by said electric motor.
Claim 11
Dependent Claim
47 words
Electric driving means according to claim 9 wherein said output shaft of said drive transmitting means protrudes through a clearance in said wheel plate accommodating pivotal movement of said output shaft and said driven pinion engages with said fixed pinion which is fixed to the wheel hub.
Claim 12
Dependent Claim
63 words
Electric driving means according to claim 10, wherein said wheel includes a body having an annular web extending from an outer peripheral region supporting said ground-engaging tire to an inner peripheral region including said hub integral with said web and of bush-form, and further comprising a stub shaft fixed to said wheel plate and rotatably mounting said wheel body on said wheel plate.
Claim 13
Dependent Claim
18 words
Electric driving means according to claim 11 wherein said control means comprises a manually operable progressive control unit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |