Patent US3563592A successfully refreshed from Google Patents.
US3563592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lockable folding brace system
Assignee: Individual
•
Filing: 1969-02-19
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Granted: 1971-02-16
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Expires: 1989-02-19
Abstract
Abstract A lockable brace linkage system is disclosed for supporting a hinged structure in an opened condition. A jointed linkage is arranged to open from a folded condition to colinearity. The median joint is locked with a tapered sliding sleeve which moves over the common joined ends of the linkage. These ends are tapered in width, one inwardly and one outwardly, to facilitate the movement of the sleeve thereover and seat with wedge action. Another embodiment of the invention useful where the lock sleeve is too light weight to slide positively, incorporates a spring bias which assists the movement of the sleeve to the lock position and also tends to maintain the linkage in the folded position.
Inventors
- 👤 Robert Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:42
CPC Classifications
E; E05; E05C; E05C17/00; E05C17/02; E05C17/04; E05C17/32; Y; Y10; Y10T; Y10T292/00; Y10T292/28; Y10T292/282; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32271; Y10T403/32319; Y10T403/32409
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A lockable folding brace system, comprising, a folding support brace flat arm linkage having first and second arms with a pivotal common lap joint, and a rectangular tapered gravity operable slidable sleeve on one of said first and second arms, said first and second arms having width-tapers at their common lap joint proportioned to receive said tapered sleeve, whereby when said first and second arms are colinearly positioned from a folded condition, said tapered sleeve is operable to slide over the common joined ends of said arms by gravity to lock the common lap joint between said arms.
Claim 2
Dependent Claim
98 words
A lockable folding brace system, comprising, a folding support brace flat arm linkage having first and second arms with a pivotal common lap joint, and a rectangular tapered gravity operable slidable sleeve on one of said first and second arms, said first and second arms having width-tapers at their common lap joint proportioned to receive said tapered sleeve, whereby when said first and second arms are colinearly positioned from a folded condition, said tapered sleeve is operable to slide over the common joined ends of said arms by gravity to lock the common lap joint between said arms.
Claim 3
Dependent Claim
88 words
A lockable folding brace system as recited in claim 1, wherein the end of one of said first and second arms is tapered in width on both sides of the pivot of said joint and wherein the end of the other of said first and second arms is correspondingly tapered in width on both sides of the pivot of said joint to facilitate the movement of said slidable sleeve thereover to seat with a wedging action along the overlap on both sides of the pivot of said joint.
Claim 4
Dependent Claim
67 words
A lockable folding brace system as recited in claim 1, wherein said slidable sleeve is on said first arm, and additionally tension bias means extending between said tapered sleeve and said second arm for thereby urging said sleeve over said common lap joint in the extended condition of said linkage and for thereby urging said first and second arms toward a proximate position in the folded condition.
Claim 5
Dependent Claim
30 words
A lockable folding brace system as recited in claim 3, wherein said tension bias means is provided on opposite sides of said tapered sleeve and extending to said second arm.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |