US4460190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand propelled wheelchair
Assignee: Individual
•
Filing: 1982-07-02
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Granted: 1984-07-17
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Expires: 2002-07-02
Abstract
Abstract A three wheeled wheelchair wherein two of the wheels are leading wheels with the single wheel being a trailing wheel. The wheelchair is propelled through the use of a chain drive assembly which is to be manually operated through the use of a handle assembly. Adjacent the handle assembly is a seat which is to support the occupant of the wheelchair. The seat is cushionly supported by a shock absorber assembly. The handle assembly is attached to a steering mechanism which, through lateral movement of the handle assembly, causes the leading wheels to be turned in respect to the frame of the wheelchair. A separate turning wheel assembly is to be manually movable to an extended position to cause the trailing wheel to be spaced from the supportive surface thereby permitting three hundred and sixty degree turning of the wheelchair about a single point.
Inventors
- 👤 Erick M. Spiess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:00
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/02; A61G5/021; A61G5/023; A61G5/024; A61G5/025; A61G5/10; A61G5/1051
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A wheelchair comprising: a frame; a pair of spaced apart leading wheels rotatably mounted on said frame; a single trailing wheel rotatably mounted on said frame; a seat mounted by mounting means on said frame, said seat being located forward of said trailing wheel and between said leading wheels; a chain drive assembly mounted on said frame and connected to said trailing wheel, said chain drive assembly for affecting rotation of said trailing wheel and movement of said wheelchair in respect to a supportive surface; and torque applying means mounted on said frame connected to said chain drive assembly, said torque applying means including a graspable handle assembly located directly adjacent said seat, longitudinal oscillatory movement of said graspable handle assembly operates through said chain drive assembly to rotate said trailing wheel, said torque applying means being connected to said leading wheels, lateral movement of said graspable handle assembly results in turning of said leading wheels for changing the direction of movement of said wheelchair.
Claim 2
Dependent Claim
165 words
A wheelchair comprising: a frame; a pair of spaced apart leading wheels rotatably mounted on said frame; a single trailing wheel rotatably mounted on said frame; a seat mounted by mounting means on said frame, said seat being located forward of said trailing wheel and between said leading wheels; a chain drive assembly mounted on said frame and connected to said trailing wheel, said chain drive assembly for affecting rotation of said trailing wheel and movement of said wheelchair in respect to a supportive surface; and torque applying means mounted on said frame connected to said chain drive assembly, said torque applying means including a graspable handle assembly located directly adjacent said seat, longitudinal oscillatory movement of said graspable handle assembly operates through said chain drive assembly to rotate said trailing wheel, said torque applying means being connected to said leading wheels, lateral movement of said graspable handle assembly results in turning of said leading wheels for changing the direction of movement of said wheelchair.
Claim 3
Dependent Claim
37 words
The wheelchair as defined in claim 1 wherein: during turning of said leading wheels the leading wheel closest in the direction of the turn is oriented at a greater angle than the other of said leading wheels.
Claim 4
Dependent Claim
18 words
The wheelchair as defined in claim 1 including: shock absorbing means located between said frame and said seat.
Claim 5
Dependent Claim
40 words
The wheelchair as defined in claim 1 wherein: said seat being hingedly mounted on said frame, whereby said seat is to be movable to a non-usable position so as to provide access to components of said wheelchair for maintenance requirements.
Claim 6
Dependent Claim
26 words
The wheelchair as defined in claim 1 wherein: said graspable handle assembly comprising a pair of spaced apart handles, said seat being located between said handles.
Claim 7
Dependent Claim
43 words
The wheelchair as defined in claim 5 wherein: each said handle including manually operable braking levers, each said braking lever being normally biased into a braking position, each said handle including locking means to hold each said braking lever in a non-braking position.
Claim 8
Dependent Claim
72 words
The wheelchair as defined in claim 1 wherein: said chain drive assembly including a crankshaft, said crankshaft being directly operated by said torque applying means, said chain drive assembly including a chain ring assembly, said chain ring assembly being rotatably mounted by a spindle assembly which is mounted upon said frame, said crankshaft being spaced from said spindle assembly, a secondary chain being connected between said chain ring assembly and said crankshaft.
Claim 9
Dependent Claim
50 words
The wheelchair as defined in claim 1 including: a manually operated turning wheel assembly attached to said frame, said turning wheel assembly being movable between a retracted position and an extended position, with said turning wheel assembly in said extended position said trailing wheel being spaced from the supportive surface.
Claim 10
Dependent Claim
49 words
The wheelchair as defined in claim 1 including: a luggage rack assembly attached to said frame, said luggage rack assembly being movable between a first position and a second position, said first position being located directly adjacent said trailing wheel, said second position being located directly adjacent said seat.
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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |