Patent US3936094A successfully refreshed from Google Patents.
US3936094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lockable tilting chair with frictional tilt resistance
Assignee: Individual
•
Filing: 1974-10-15
•
Granted: 1976-02-03
•
Expires: 1994-10-15
Abstract
Abstract A tiltable chair has a frictional resistance to tilting, and locking means releasably securing the erect position of the seat. Resistance to tilt preferably decreases with increased tilt angle, and is generated by the resilient engagement of bearing members acting against opposite surfaces for lateral neutralization of forces. The locking means is released in response to pressure on the chair seat.
Inventors
- 👤 William Arthur Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:36
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/443; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A tiltable support for a chair seat, said support including a base structure, fulcrum means secured to said base structure and adapted to be secured to said seat to establish a pivot axis, and brake means having one portion fixed with respect to said base structure, and another portion normally secured to said seat, said brake means being operable to establish resistance to tilting movement of said seat with respect to said base structure, wherein the improvement comprises: a member having opposite surfaces, included in one of said brake means portions and extending transversely with respect to said pivot axis; and friction-generating means mounted on the other of said brake means portions for movement along paths generally perpendicular toward and away from said opposite surfaces, respectively, and adapted to bear resiliently on said opposite surfaces, said opposite surfaces converging in a direction to induce maximum displacement of said friction-generating means in the erect position of said seat.
Claim 2
Dependent Claim
157 words
A tiltable support for a chair seat, said support including a base structure, fulcrum means secured to said base structure and adapted to be secured to said seat to establish a pivot axis, and brake means having one portion fixed with respect to said base structure, and another portion normally secured to said seat, said brake means being operable to establish resistance to tilting movement of said seat with respect to said base structure, wherein the improvement comprises: a member having opposite surfaces, included in one of said brake means portions and extending transversely with respect to said pivot axis; and friction-generating means mounted on the other of said brake means portions for movement along paths generally perpendicular toward and away from said opposite surfaces, respectively, and adapted to bear resiliently on said opposite surfaces, said opposite surfaces converging in a direction to induce maximum displacement of said friction-generating means in the erect position of said seat.
Claim 3
Dependent Claim
34 words
A support as defined in claim 1, additionally including releasable locking means interengageable between components fixed with respect to said seat and said base structure, respectively, to secure the erect position of said seat.
Claim 4
Dependent Claim
27 words
A support as defined in claim 1, wherein said surfaces converge in a direction away from said seat, and said member is normally mounted on said seat.
Claim 5
Dependent Claim
47 words
A support as defined in claim 3 wherein said surfaces converge at an angle to the path of movement thereof, the coefficient of friction between said surfaces and said friction-generating means being sufficient to overcome any tendency for the seat to be squeezed into a tilted condition.
Claim 6
Dependent Claim
24 words
A support as defined in claim 3, wherein said opposite surfaces are spaced in a direction parallel to the axis of said fulcrum means.
References Cited (Backward Citations)
US93978A
Cited
US596079A
Cited
US1117979A
Cited
GB454639A
Cited
NL41026C
Cited
GB494971A
Cited
US2619153A
Cited
US2942650A
Cited
US3044827A
Cited
US3135549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |