Patent US4729447A successfully refreshed from Google Patents.
US4729447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safeguard for powered wheelchair
Assignee: Individual
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Filing: 1986-09-15
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Granted: 1988-03-08
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Expires: 2006-09-15
Abstract
Abstract A safeguard for an electric powered wheelchair having a forward steering column (13) on which a handle bar (14) and a control lever (20) are mounted, said safeguard comprising a platform (25) underlying said lever (20) and extending rearwardly thereof to provide contact with the body of an occupant of the chair when rising to dismount therefrom.
Inventors
- 👤 John F. Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:19
CPC Classifications
B; B62; B62K; B62K11/00; B62K11/14; B62K5/00; B62K5/02; B62K5/023; B62K5/025; Y; Y10; Y10S; Y10S180/00; Y10S180/907; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/2093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
In combination with an electric powered wheelchair having a steering column forward of the chair seat, a handle bar mounted on the top of said column and extending substantially crosswise of the longitudinal axis of the wheelchair, a switch box mounted at the top of the steering column, and a switch control lever pivoted on the underside of said box spaced behind said handle bar and extending substantially parallel therewith, the improvement comprising a fail-safe guard mounted on said handle bar and extending rearwardly beneath said control lever to prevent accidental contact therewith by the body of the chair occupant when rising to dismount.
Claim 2
Dependent Claim
104 words
In combination with an electric powered wheelchair having a steering column forward of the chair seat, a handle bar mounted on the top of said column and extending substantially crosswise of the longitudinal axis of the wheelchair, a switch box mounted at the top of the steering column, and a switch control lever pivoted on the underside of said box spaced behind said handle bar and extending substantially parallel therewith, the improvement comprising a fail-safe guard mounted on said handle bar and extending rearwardly beneath said control lever to prevent accidental contact therewith by the body of the chair occupant when rising to dismount.
Claim 3
Dependent Claim
23 words
The combination of claim 1, wherein said fail-safe guard has a rear edge flange for contact with the body of the chair occupant.
Claim 4
Dependent Claim
34 words
The combination of claim 2, wherein said rear edge flange is spaced behind said lever a distance at least equal to the thickness of an occupant's thumb when the lever is in neutral position.
Claim 5
Dependent Claim
33 words
The combination of claim 3, wherein said fail-safe guard has a platform underlying said lever to serve as a guide for the entrance of the occupant's thumbs into actuating position behind said lever.
Claim 6
Dependent Claim
33 words
The combination of claim 1, wherein said fail-safe guard comprises a platform underlying said lever to serve as a guide for the entrance of the occupant's thumbs into actuating position behind said lever.
Claim 7
Dependent Claim
35 words
The combination of claim 5, wherein the rear edge of said platform is spaced behind said lever a distance slightly greater than the thickness of an occupant's thumb when the lever is in neutral position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |