US3903513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheelchair alarm system
Assignee: Individual
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Filing: 1974-07-18
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Granted: 1975-09-02
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Expires: 1994-07-18
Abstract
Abstract A wheelchair alarm system includes a frame adapted to be mounted beneath the wheelchair seat, an electrically operated alarm securely attached to the frame, a first switch securely attached to the frame and adapted to be maintained in contact with the wheelchair seat, and second and third switches securely attached to the frame and adapted to be positioned in the path of movement of the wheelchair brake assemblies. The alarm and the three switches are electrically connected in such a manner that the alarm is actuated if the first switch is closed and if either the second or third switch is closed, indicating that the wheelchair seat is unoccupied and at least one of the brakes is disengaged.
Inventors
- 👤 Ronald F Green
- 👤 Royal Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:10
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; A61G5/1005; A61G5/1035; A61G5/101; A61G5/1013; A61G5/1018; A61G2203/00; A61G2203/30; B; B62; B62B; B62B5/00; B62B5/04; B62B5/0404; B62B5/0409; B62B5/0485
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
300 words
In a wheelchair including a seat, first and second drive wheels, and first and second drive wheel brake assemblies movable along a wheel engaging path, the improvement comprising: a. a support means adapted to be mounted beneath the wheelchair seat; b. electrically actuated alarm means securely attached to said support means; c. first switch means securely attached to said support means and adapted to be maintained in contact with said wheelchair seat to thereby assume a first position when there is no weight on said wheelchair seat and be forced into a second position in response to a weight on said wheelchair seat; d. second switch means securely attached to one end of said support means and adapted to be positioned in the path of movement of said first brake assembly to thereby assume a first position when said first brake assembly is disengaged from said first drive wheel and be forced into a second position when said first brake is applied to said first drive wheel; e. third switch means securely attached to the other end of said support means and adapted to be positioned in the path of movement of said second brake assembly to thereby assume a first position when said second brake assembly is disengaged from said second drive wheel and be forced into a second position when said second brake is applied to said second drive wheel; and f. conductor means electrically connecting said alarm means, said first switch means, said second switch means and said third switch means so that said alarm means is actuated if said first switch means and either said second switch means or said third switch means are in said first position, indicating no weight on said wheelchair seat and the disengagement of at least one of said brake assemblies.
Claim 2
Dependent Claim
300 words
In a wheelchair including a seat, first and second drive wheels, and first and second drive wheel brake assemblies movable along a wheel engaging path, the improvement comprising: a. a support means adapted to be mounted beneath the wheelchair seat; b. electrically actuated alarm means securely attached to said support means; c. first switch means securely attached to said support means and adapted to be maintained in contact with said wheelchair seat to thereby assume a first position when there is no weight on said wheelchair seat and be forced into a second position in response to a weight on said wheelchair seat; d. second switch means securely attached to one end of said support means and adapted to be positioned in the path of movement of said first brake assembly to thereby assume a first position when said first brake assembly is disengaged from said first drive wheel and be forced into a second position when said first brake is applied to said first drive wheel; e. third switch means securely attached to the other end of said support means and adapted to be positioned in the path of movement of said second brake assembly to thereby assume a first position when said second brake assembly is disengaged from said second drive wheel and be forced into a second position when said second brake is applied to said second drive wheel; and f. conductor means electrically connecting said alarm means, said first switch means, said second switch means and said third switch means so that said alarm means is actuated if said first switch means and either said second switch means or said third switch means are in said first position, indicating no weight on said wheelchair seat and the disengagement of at least one of said brake assemblies.
Claim 3
Dependent Claim
36 words
An apparatus as set forth in claim 1 wherein said support means includes a frame having a main supporting member and two auxiliary supporting members securely fastened to said main supporting member at the ends thereof.
Claim 4
Dependent Claim
39 words
An apparatus as set forth in claim 2 wherein said first switch means is securely fastened to said main supporting member and said second and third switch means are each securely fastened to one of said auxiliary supporting members.
Claim 5
Dependent Claim
27 words
An apparatus as set forth in claim 2 wherein said main supporting member is linear and includes means for adjusting the length of said main supporting member.
Claim 6
Dependent Claim
59 words
An apparatus as set forth in claim 2 wherein said frame further includes a plate having a plurality of mounting holes contained therein securely fastened to said main supporting member, and wherein said first switch means is securely attached to said plate whereby the position of said first switch means with respect to said main supporting member is adjustable.
Claim 7
Dependent Claim
271 words
An alarm system for a wheelchair having a seat and first and second brake assemblies comprising: a. support means having a main supporting member and fastening means located at the ends of said main supporting member for attaching said support means to a wheelchair, b. first switch means securely attached to said support means and adapted to assume a first position when unstressed and assume a second position when a force is applied to said first switch means to thereby respond to weight on said seat, c. second switch means securely attached to one end of said support means so as to project beyond one end of said main supporting member, said second switch means being adapted to assume a first position when unstressed and assume a second position when a force is applied to said second switch means to thereby respond to the position of said first brake assembly, d. third switch means securely attached to the other end of said support means so as to project beyond the other end of said main supporting member, said third switch means being adapted to assume a first position when unstressed and assume a second position when a force is applied to said third switch means to thereby respond to the position of said second brake assembly, e. electrically actuated alarm means, and f. conductor means electrically connecting said alarm means, said first switch means, said second switch means, and said third switch means so that said alarm means is actuated if said first switch means and either said second switch means or said third switch means are in said first position.
Claim 8
Dependent Claim
271 words
An alarm system for a wheelchair having a seat and first and second brake assemblies comprising: a. support means having a main supporting member and fastening means located at the ends of said main supporting member for attaching said support means to a wheelchair, b. first switch means securely attached to said support means and adapted to assume a first position when unstressed and assume a second position when a force is applied to said first switch means to thereby respond to weight on said seat, c. second switch means securely attached to one end of said support means so as to project beyond one end of said main supporting member, said second switch means being adapted to assume a first position when unstressed and assume a second position when a force is applied to said second switch means to thereby respond to the position of said first brake assembly, d. third switch means securely attached to the other end of said support means so as to project beyond the other end of said main supporting member, said third switch means being adapted to assume a first position when unstressed and assume a second position when a force is applied to said third switch means to thereby respond to the position of said second brake assembly, e. electrically actuated alarm means, and f. conductor means electrically connecting said alarm means, said first switch means, said second switch means, and said third switch means so that said alarm means is actuated if said first switch means and either said second switch means or said third switch means are in said first position.
Claim 9
Dependent Claim
30 words
An alarm system as set forth in claim 6, wherein said support means further includes two auxiliary supporting members securely fastened to said main supporting member at the ends thereof.
Claim 10
Dependent Claim
39 words
An apparatus as set forth in claim 7 wherein said first switch means is securely fastened to said main supporting member and said second and third switch means are each securely fastened to one of said auxiliary supporting members.
Claim 11
Dependent Claim
25 words
An apparatus as set forth in claim 7 wherein said linear main supporting member includes means for adjusting the length of said main supporting member.
Claim 12
Dependent Claim
60 words
An apparatus as set forth in claim 7 wherein said support means further includes a plate having a plurality of mounting holes contained therein securely fastened to said main supporting member, and wherein said first switch means is securely attached to said plate whereby the position of said first switch means with respect to said main supporting member is adjustable.
References Cited (Backward Citations)
US3723968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |