US3603553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair control
Assignee: Doerner Products Co Ltd
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Filing: 1969-10-17
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Granted: 1971-09-07
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Expires: 1989-10-17
Abstract
Abstract A chair control for a tilting chair having a simplified construction. The chair control has a control tube which is telescopically mounted in the tubular chair post of the chair. The control tube has a fixed control frame mounted on the top thereof and a tiltable frame pivotally mounted on the control frame. The tiltable frame is attachable to the underside of the chair seat. Spring biasing means is mounted within the control tube and operatively connected to the tiltable frame to yieldably resist pivotal movement of the tiltable frame under a backward tilt force applied by the occupant of the chair.
Inventors
- 👤 Frank Doerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:42
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/443
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
350 words
A chair control for a tilting chair having a chair seat, a chair base and a vertical tubular post supported by the base, comprising: a. a control tube having upper and lower ends, said tube in a bearing sleeve securely mounted in said post, said tube being rotatable in the sleeve about its longitudinal axis; b. a fixed control frame fixedly mounted on the upper end of the control tube at about right angles to the said longitudinal axis, said frame consisting of a substantially flat plate bordered by an upstanding flange; c. a pivotal frame attachable to the underside of a chair seat permitting pivotal movement of the seat between a normal stop position; said pivotal frame having a pair of spaced apart downwardly projecting flanges which overlap the said upstanding flange and a slotted downwardly extending bracket attached centrally to the pivotally frame member; d. a pivot pin pivotally connecting said flanges together at a point spaced horizontally from thE vertical axis of the control tube; e. a substantially rigid connecting rod mounted in the control tube with its longitudinal axis substantially coaxial with the longitudinal axis of the control tube; f. said rod having a head on its upper end said rod being entered through said slot of the bracket with the head engaging the said bracket; g. said rod having an extension on its other end projecting beyond the control tube, a bushing mounted on the lower end of the control tube through which said rod passes, a centering member mounted on the lower end of the control tube and secured thereto by a flange formed on the lower end of said bushing, said centering member having a sliding fit with the inner wall of the tubular post and underlying the inner end of the sleeve; and h. spring means mounted on said extension between said centering member and a retaining member mounted on said rod, whereby said spring yieldably resists pivotal movement of the pivotal frame under a force applied by the occupant of the chair from the normal position to the tilt stop position.
Claim 2
Dependent Claim
350 words
A chair control for a tilting chair having a chair seat, a chair base and a vertical tubular post supported by the base, comprising: a. a control tube having upper and lower ends, said tube in a bearing sleeve securely mounted in said post, said tube being rotatable in the sleeve about its longitudinal axis; b. a fixed control frame fixedly mounted on the upper end of the control tube at about right angles to the said longitudinal axis, said frame consisting of a substantially flat plate bordered by an upstanding flange; c. a pivotal frame attachable to the underside of a chair seat permitting pivotal movement of the seat between a normal stop position; said pivotal frame having a pair of spaced apart downwardly projecting flanges which overlap the said upstanding flange and a slotted downwardly extending bracket attached centrally to the pivotally frame member; d. a pivot pin pivotally connecting said flanges together at a point spaced horizontally from thE vertical axis of the control tube; e. a substantially rigid connecting rod mounted in the control tube with its longitudinal axis substantially coaxial with the longitudinal axis of the control tube; f. said rod having a head on its upper end said rod being entered through said slot of the bracket with the head engaging the said bracket; g. said rod having an extension on its other end projecting beyond the control tube, a bushing mounted on the lower end of the control tube through which said rod passes, a centering member mounted on the lower end of the control tube and secured thereto by a flange formed on the lower end of said bushing, said centering member having a sliding fit with the inner wall of the tubular post and underlying the inner end of the sleeve; and h. spring means mounted on said extension between said centering member and a retaining member mounted on said rod, whereby said spring yieldably resists pivotal movement of the pivotal frame under a force applied by the occupant of the chair from the normal position to the tilt stop position.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |