US4664441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in or relating to aids for the disabled
Assignee: Carters J and A Ltd
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Filing: 1985-06-27
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Granted: 1987-05-12
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Expires: 2005-06-27
Abstract
Abstract A folding backrest of a wheelchair has two attendant handles fixed to upper tubes hinged to vertical lower tubes so as to be turnable into lowered positions. Supported on the upper tubes are respective cams turnable rearwardly by an attendant about a horizontal axis and in opposition to springs, from positions in which they bear against horizontal pins fixed at the rears of the lower tubes and maintain the upper tubes in their raised positions, into positions which allow them to be lowered past the pins to permit the backrest to be lowered.
Inventors
- 👤 Donald E. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:30
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; Y; Y10; Y10S; Y10S297/00; Y10S297/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A folding aid for the disabled, including first and second aid parts which in a latched condition are disposed end-to-end, hinge means interconnecting said aid parts such that said parts are turnable relative to each other about an axis of said hinge means between the latched condition and a folded condition, latching means turnably mounted on the first aid part so as to be manually turnable relative thereto, and detent means mounted on the second aid part so as to be releasably engageable by said latching means so as to retain said aid parts in said latched condition, said latching means being biased towards it condition in which it releasably engages said detent means, wherein said latching means includes a curved camming surface by way of which said latching means bears on said detent means under its bias, said camming surface increasing in radius progressing away from said second aid part in said latching condition, thereby to take up play in said latching condition.
Claim 2
Dependent Claim
164 words
A folding aid for the disabled, including first and second aid parts which in a latched condition are disposed end-to-end, hinge means interconnecting said aid parts such that said parts are turnable relative to each other about an axis of said hinge means between the latched condition and a folded condition, latching means turnably mounted on the first aid part so as to be manually turnable relative thereto, and detent means mounted on the second aid part so as to be releasably engageable by said latching means so as to retain said aid parts in said latched condition, said latching means being biased towards it condition in which it releasably engages said detent means, wherein said latching means includes a curved camming surface by way of which said latching means bears on said detent means under its bias, said camming surface increasing in radius progressing away from said second aid part in said latching condition, thereby to take up play in said latching condition.
Claim 3
Dependent Claim
138 words
A folding aid for the disabled, including first and second aid parts which in a latched condition are disposed end-to-end, hinge means interconnecting said aid parts such that said parts are turnable relative to each other about an axis of said hinge means between the latched condition and a folded condition, latching means turnably mounted on the first aid part so as to be manually turnable relative thereto, and detent means mounted on the second aid part so as to be releasably engageable by said latching means so as to retain said aid parts in said latched condition, said latching means being biased towards it condition in which it releasably engages said detent means, wherein said latching means comprises a substantially sectorial plate whereof a radially outer peripheral surface bears on said detent means in said latched condition.
Claim 4
Dependent Claim
138 words
A folding aid for the disabled, including first and second aid parts which in a latched condition are disposed end-to-end, hinge means interconnecting said aid parts such that said parts are turnable relative to each other about an axis of said hinge means between the latched condition and a folded condition, latching means turnably mounted on the first aid part so as to be manually turnable relative thereto, and detent means mounted on the second aid part so as to be releasably engageable by said latching means so as to retain said aid parts in said latched condition, said latching means being biased towards it condition in which it releasably engages said detent means, wherein said latching means comprises a substantially sectorial plate whereof a radially outer peripheral surface bears on said detent means in said latched condition.
Claim 5
Dependent Claim
26 words
A folding aid according to claim 2, wherein said detent means comprises a pin extendinng substantially parallelly to an axis of turning of said latching means.
Claim 6
Dependent Claim
30 words
A folding aid according to claim 2 and in the form of a folding wheelchair, at least one of said aid parts being part of a backrest of said wheelchair.
Claim 7
Dependent Claim
28 words
A folding aid according to claim 4, wherein said first aid part is the upper of the aid parts in said latched condition and includes an attendant handle.
Claim 8
Dependent Claim
26 words
A folding aid according to claim 1, wherein said detent means comprises a pin extending substantially parallelly to an axis of turning of said latching means.
Claim 9
Dependent Claim
30 words
A folding aid according to claim 1 and in the form of a folding wheelchair, at least one of said aid parts being part of a backrest of said wheelchair.
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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |