US4245847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheelchair
Assignee: Individual
•
Filing: 1979-05-24
•
Granted: 1981-01-20
•
Expires: 1999-05-24
Abstract
Abstract A wheelchair suitable for invalids or geriatric patients has a chair or seat supported on independant forward and rearward castor frames pivotally connected together at a transverse axis to form a castor frame assembly. The chair is pivotally mounted on the forward and rearward castor frames so that in negotiating a step or other obstacle, the lifting movement of the occupant is divided into stages so that a pleasant or comfortable ride is obtained. The wheelchair may be folded into a collapsed condition with the chair itself located between the castor frames.
Inventors
- 👤 Christopher Knott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:23
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A wheelchair comprising a forward castor frame, an independent rearward castor frame pivotally connected to said forward castor frame at a transverse axis of pivotal connection which interconnects said frames to form a castor frame assembly, each of said castor frames carrying at least one ground engaging castor, a pair of independently rotatable ground engaging wheels mounted one on each side of said castor frame assembly between the castors of said forward and rearward castor frames respectively, said wheel chair including a chair seat which, in said collapsed condition being mounted on said forward castor frame rearwardly of the castor on said forward castor frame, and rear chair legs mounted on said rearward castor frame forwardly of the castor on said rearward castor frame, said rear chair legs being pivotable relative to said rearward castor frame.
Claim 2
Dependent Claim
136 words
A wheelchair comprising a forward castor frame, an independent rearward castor frame pivotally connected to said forward castor frame at a transverse axis of pivotal connection which interconnects said frames to form a castor frame assembly, each of said castor frames carrying at least one ground engaging castor, a pair of independently rotatable ground engaging wheels mounted one on each side of said castor frame assembly between the castors of said forward and rearward castor frames respectively, said wheel chair including a chair seat which, in said collapsed condition being mounted on said forward castor frame rearwardly of the castor on said forward castor frame, and rear chair legs mounted on said rearward castor frame forwardly of the castor on said rearward castor frame, said rear chair legs being pivotable relative to said rearward castor frame.
Claim 3
Dependent Claim
38 words
The wheelchair defined in claim 1, wherein said front chair legs are mounted on the rear half of the forward castor frame and said rear chair legs are mounted on the front half of the rearward castor frame.
Claim 4
Dependent Claim
16 words
The wheelchair defined in claim 1, wherein said forward castor frame carries a single castor wheel.
Claim 5
Dependent Claim
16 words
The wheelchair defined in claim 1, wherein said rearward castor frame carries a single castor wheel.
Claim 6
Dependent Claim
31 words
The wheelchair defined in claim 1, wherein said ground engaging wheels are rotatable about the transverse axis of the pivotal connection between said forward castor frame and said rearward castor frame.
Claim 7
Dependent Claim
37 words
The wheelchair defined in claim 1, wherein the chair legs are mounted on both the forward and rearward castor frames by pivotal mountings permitting folding of the wheelchair to a collapsed position without disconnection of said mountings.
Claim 8
Dependent Claim
45 words
A wheel chair as defined in claim 1, foldable to a collapsed condition, said ground engaging wheels being pivoted to said caster frame assembly for rotation about an axis directed transversely of said castor frame assembly, front chair legs pivotably located between the castor frames.
References Cited (Backward Citations)
US865514A
Cited
US1226848A
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US2285699A
Cited
US2986200A
Cited
US3100547A
Cited
US3591195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |