US3905437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically drivable wheelchair
Assignee: U M I KK
•
Filing: 1974-07-19
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Granted: 1975-09-16
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Expires: 1994-07-19
Abstract
Abstract In a wheelchair for disabled persons having side wheels with hand rims, an electric driving unit comprising: a main body including an electric motor; a jack portion having a member moved by a jackscrew driven by the electric motor; and driving wheels driven by the electric motor through a speed-reduction device is pivotally connected to a rear part of the wheelchair through a supporting lever and spring means, whereby the wheelchair can be driven by the electric motor when the driving wheel is brought down to contact the ground surface particularly in climbing and descending a step such as a curb of a sidewalk.
Inventors
- 👤 Yasuharu Kaiho
- 👤 Takeo Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:18
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/04; A61G5/047; A61G5/06; A61G5/10; A61G5/1054; Y; Y10; Y10S; Y10S180/00; Y10S180/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
In a wheelchair of the type having a chassis, a pair of side wheels with hand rims, and at least one front wheel, the improved combination thereof with an electric driving means comprising a main body including an electric motor, a jack portion including free-running mechanisms and a jackscrew coupled to said electric motor, and driving wheels also coupled to said electric motor, said electric driving means being attached extensibly and contractably to a rear part on the wheelchair through supporting means and spring means.
Claim 2
Dependent Claim
85 words
In a wheelchair of the type having a chassis, a pair of side wheels with hand rims, and at least one front wheel, the improved combination thereof with an electric driving means comprising a main body including an electric motor, a jack portion including free-running mechanisms and a jackscrew coupled to said electric motor, and driving wheels also coupled to said electric motor, said electric driving means being attached extensibly and contractably to a rear part on the wheelchair through supporting means and spring means.
Claim 3
Dependent Claim
56 words
A wheelchair as set forth in claim 1 wherein said means for supporting said electric driving means comprises a V-shaped lever two ends of which are pivotally connected to the rear part of said chassis, and the central part of which is pivotally coupled to a movable part of said jack portion through a king pin.
Claim 4
Dependent Claim
40 words
A wheelchair as set forth in claim 1 wherein two spring means are used, each having forward and rear ends pivotally connected to a rear part of the wheel chair and the main body of the electric driving means, respectively.
Claim 5
Dependent Claim
67 words
A wheelchair as set forth in claim 1 wherein there are further provided auxiliary tilting means comprising a control handle and a tilting lever, an end of each of said control handle and tilting lever being pivotally connected to a forward part of the chassis through a commonly provided pivot pin, and a spring member extended between suitable positions on the said control handle and tilting lever.
Claim 6
Dependent Claim
22 words
A wheelchair as set forth in claim 1 wherein a worm-wheel device is interposed between said electric motor and said drive wheels.
Claim 7
Dependent Claim
24 words
A wheelchair as set forth in claim 5 wherein a free wheel device is further provided between the worm-wheel device and the driving wheels.
Claim 8
Dependent Claim
44 words
A wheelchair as set forth in claim 2 wherein said jack portion further comprises a stationary member rigidly coupled with the main body, and a member which is moved upon rotation of said jackscrew and coupled with said V-shaped lever through said king pin.
Claim 9
Dependent Claim
33 words
A wheelchair as set forth in claim 7 wherein said free-running mechanisms release the coupling between the movable member and the electric motor when the movable member reaches the extremities of its stroke.
References Cited (Backward Citations)
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US2931449A
Cited
US3023825A
Cited
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |