US3889773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive disconnect for motorized wheelchair
Assignee: Vessa Ltd
•
Filing: 1974-02-05
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Granted: 1975-06-17
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Expires: 1994-02-05
Abstract
Abstract The invention provides an electric motorized unit for wheelchairs in which manual handling is facilitated by shifting a wheel hub driving gear axially over a key out of mesh with a gear driven by an electric motor so as to eliminate drag due to motor torque.
Inventors
- 👤 John Bernard Chant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:46
CPC Classifications
B; B62; B62M; B62M7/00; B62M7/12; B60; B60L; B60L50/00; B60L50/50; B60L50/60; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y10; Y10S; Y10S180/00; Y10S180/907; Y10T; Y10T74/00; Y10T74/19; Y10T74/19614
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
An electrical driving unit for a wheel or a wheel chair comprising a mounting plate attached to a fixed wheel axle and carrying an electric motor whose output shaft passes through the said plate, a gear mounted on the said shaft and normally meshed with a gear axially slidable over a key in a wheel hub freely rotatable on the said axle and wherein manually operable means passing through the said plate is actuable to slide the said axially slidable gear over the said key so as to disconnect it from the gear on the said output shaft.
Claim 2
Dependent Claim
98 words
An electrical driving unit for a wheel or a wheel chair comprising a mounting plate attached to a fixed wheel axle and carrying an electric motor whose output shaft passes through the said plate, a gear mounted on the said shaft and normally meshed with a gear axially slidable over a key in a wheel hub freely rotatable on the said axle and wherein manually operable means passing through the said plate is actuable to slide the said axially slidable gear over the said key so as to disconnect it from the gear on the said output shaft.
Claim 3
Dependent Claim
35 words
An electrical driving unit according to claim 1 wherein the manually operable means comprises a snail cam mounted on one end of a rotatable shaft and having Its operative face confronting the said mounting plate.
Claim 4
Dependent Claim
41 words
An electrical driving unit according to claim 2 wherein the operative face of the cam abuts an arm of a yoke, pivoted to the said mounting plate, another arm of which yoke engages a disc affixed to the axially slidable gear.
Claim 5
Dependent Claim
30 words
An electrical driving unit according to claim 3 wherein the disc is pressed towards the said other arm by a coil spring surrounding the freely rotatable hub of the wheel.
References Cited (Backward Citations)
US2586273A
Cited
US2544831A
Cited
US2618170A
Cited
US3770073A
Cited
US3766795A
Cited
US3800901A
Cited
US3786887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |