Patent US4489964A successfully refreshed from Google Patents.
Patent US3752265A successfully refreshed from Google Patents.
US3752265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel chair locking arrangement
Assignee: Individual
•
Filing: 1971-12-20
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Granted: 1973-08-14
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Expires: 1991-12-20
Abstract
Abstract A locking attachment for a wheel chair. The locking arrangement includes vertical shafts lowerable to a position for threading into a socket member fixed to a vehicle floor, thereby to maintain the wheel chair locked against movement.
Inventors
- 👤 A Lyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:52
CPC Classifications
A; A61; A61G; A61G3/00; A61G3/08; A61G3/0808
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A locking attachment for maintaining a wheel chair locked in stationary position on a floor, said wheel chair having a brace to support the wheel chair seat, and horizontal supports for the wheels of said chair, said attachment comprising a shaft having a threaded end, means for vertically and reciprocably mounting said shaft on said wheel chair, said mounting means including means for guiding said shaft, and socket means in the floor to receive the threaded end of said shaft, to prevent rolling movement of the wheel chair.
Claim 2
Dependent Claim
88 words
A locking attachment for maintaining a wheel chair locked in stationary position on a floor, said wheel chair having a brace to support the wheel chair seat, and horizontal supports for the wheels of said chair, said attachment comprising a shaft having a threaded end, means for vertically and reciprocably mounting said shaft on said wheel chair, said mounting means including means for guiding said shaft, and socket means in the floor to receive the threaded end of said shaft, to prevent rolling movement of the wheel chair.
Claim 3
Dependent Claim
40 words
The invention as defined in claim 1 wherein a frusto-conical member is fixed adjacent to said shaft end and said shaft is threadable in said socket means, and wherein said socket means includes a frusto-conical recess complementary to said member.
Claim 4
Dependent Claim
20 words
The invention as defined in claim 1 wherein said shafts include hand wheel means fixed to the upper ends thereof.
Claim 5
Dependent Claim
62 words
The invention as defined in claim 1 wherein said mounting means includes a first bracket means adapted to be supported on the brace of the seat support of said wheel chair, and a second bracket means adapted to be supported on said horizontal wheel supports of said wheel chair, and said first and second bracket means includes means for guiding said shafts.
Claim 6
Dependent Claim
54 words
The invention as defined in claim 4 wherein said guiding means on said second bracket means comprises a sleeve, and said shaft includes stop means fixed thereto above said sleeve, and wherein spring means are disposed between said stop means and said sleeve, to yieldingly elevate said shaft when unseated frOm said socket means.
Claim 7
Dependent Claim
54 words
The invention as defined in claim 4 wherein said shaft includes clamping means engageable with said guiding means on said first bracket assembly for applying a clamping force so that said bracket means are maintained clamped on said seat supporting brace and said wheel brace, when said shafts are threaded into said socket means.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |