Patent US3989295A successfully refreshed from Google Patents.
US3989295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding chairs
Assignee: Individual
•
Filing: 1974-11-04
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Granted: 1976-11-02
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Expires: 1994-11-04
Abstract
Abstract A folding chair, especially a wheeled push chair for a child, comprises a pair of similar side frames of interpivoted bars and cross-members integral with the side frames, the cross-members having only intermediate hinges which come into coaxial alignment when the side frames are folded and the side frames can then close together like a book.
Inventors
- 👤 Curtis A. Sparkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:06
CPC Classifications
A; A47; A47C; A47C4/00; A47C4/28; A47C4/42; A47C4/44; B; B62; B62B; B62B7/00; B62B7/04; B62B7/06; B62B7/08; B62B9/00; B62B9/08; B62B9/082; B62B2205/00; B62B2205/02; B62B5/00; B62B5/04; B62B5/0433; B62B5/0457; B62B5/0461; B62B7/086; B62B9/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A folding chair comprising a substantially parallel pair of similar folding side frames, each side frame including essentially a quadrilateral linkage of interpivoted bars, which bars can be pivoted relatively between an open position of use and a folded position wherein the bars lie side-by-side, and cross-members interconnecting the side frames, the cross-members having their ends each respectively integral with a bar of the respective side frame and the cross-members having hinges located only intermediately of their ends, the hinges being arranged in at least one set lying in a plane substantially parallel to the planes of the side frames and the axes of the hinges of said set lying out of coaxial alignment in the open position of the side frames but extending in coaxial alignment in the folded position of the side frames which can then close together like a book.
Claim 2
Dependent Claim
143 words
A folding chair comprising a substantially parallel pair of similar folding side frames, each side frame including essentially a quadrilateral linkage of interpivoted bars, which bars can be pivoted relatively between an open position of use and a folded position wherein the bars lie side-by-side, and cross-members interconnecting the side frames, the cross-members having their ends each respectively integral with a bar of the respective side frame and the cross-members having hinges located only intermediately of their ends, the hinges being arranged in at least one set lying in a plane substantially parallel to the planes of the side frames and the axes of the hinges of said set lying out of coaxial alignment in the open position of the side frames but extending in coaxial alignment in the folded position of the side frames which can then close together like a book.
Claim 3
Dependent Claim
20 words
A folding chair according to claim 1, in which the cross-member hinges are offset from the centres of the cross-members.
Claim 4
Dependent Claim
59 words
A folding chair according to claim 2, in which the cross-members each have a central part hinged to end parts which are integral with the side frames so that the cross-member hinges lie in two sets respectively two parallel planes and the hinges in each plane respectively come into coaxial alignment in the folded position of the side frames.
Claim 5
Dependent Claim
50 words
A folding chair according to claim 3, in which the bars of each side frame comprise a front leg, a seat side bar, an arm-rest and a back pillar, all interpivoted to form a quadrilateral linkage, and a back leg pivoted to the back pillar and to the arm rest.
Claim 6
Dependent Claim
29 words
A folding chair according to claim 4, in which the cross-members comprise a lower front rail, a front seat rail, a lower back rail and an upper back rail.
Claim 7
Dependent Claim
39 words
A folding chair according to claim 5, in which said seat side bars of the side frames extend integrally into said front seat rail and said back pillars of the side frames extend integrally into said upper back rail.
Claim 8
Dependent Claim
48 words
A folding chair according to claim 6, in which a seat of flexible sheet material is slung between said front seat rail and said upper back rail and said lower back rail is located clearly below said seat material in the open position of use of the chair.
Claim 9
Dependent Claim
29 words
A folding chair according to claim 7, in which said lower front rail is formed as a foot-rest and said upper back rail is formed as a handle bar.
Claim 10
Dependent Claim
93 words
A folding chair according to claim 1, in which a side frame is provided with a locking member which is movably mounted on one bar of said side frame and is biased into a position in which it engages an abutment on an adjacent bar of said side frame to prevent folding of said side frame from the open to the folded position, the locking member comprising a sleeve slidable on a back pillar bar of said side frame and engageable with an abutment on a back leg bar of said side frame.
Claim 11
Dependent Claim
23 words
A folding chair according to claim 4, in which the front and back leg bars of the side frames are provided with wheels.
References Cited (Backward Citations)
US404494A
Cited
US663857A
Cited
US1110695A
Cited
US2397322A
Cited
US2429763A
Cited
US2871921A
Cited
US2906319A
Cited
US3624814A
Cited
US3797848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |