US3552706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair control
Assignee: Stewart Warner Ltd
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Filing: 1968-06-07
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Granted: 1971-01-05
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Expires: 1988-06-07
Abstract
Abstract This invention is a chair control for controlling tilting of a seat in relation to a pedestal or a seat back in relation to a seat or both types of movement. A chair control is frequently sold as a unit to a chair manufacturer for fitting to a pedestal and a seat. The control uses torsion bar restraint against tilting with a single bar providing restraint against both types of tilting. The reaction is taken at the center of the torsion bar at slightly spaced points for separation of the reaction stresses. Two parts of the torsion bar may have different torsional stress characteristics so that one will fail before the other and the occupant will not be likely to be thrown from the seat due to all torsional restraint disappearing at one moment.
Inventors
- 👤 Roy Shingler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/441; A47C7/445; A47C7/4454
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A chair control having a post support member adapted to be carried on a post, the improvement comprising a torsion bar, meaNs fixed to said post support member and fixed to said bar at spaced positions on opposite sides of said post support member for holding said bar against rotation at said positions, a pair of spider arms extending rearwardly from the axis of said bar for carrying a seat with each spider arm spaced adjacent a respective one of said positions, a tube for each spider arm encircling said bar, means securing one end of each tube to a respective one of said spider arms to prevent relative rotation between each spider arm and the respective tube end, and means securing the opposite end of each tube independently of the other tube nonrotatably to a respective end of said bar whereby said bar is stressed separately between each position and a respective end of said bar in response to pivotal movement of said spider arms about the axis of said bar with the portion of said bar between said two positions serving to isolate the stresses in one portion of said bar from stresses in the other portion of said bar.
Claim 2
Dependent Claim
202 words
A chair control having a post support member adapted to be carried on a post, the improvement comprising a torsion bar, meaNs fixed to said post support member and fixed to said bar at spaced positions on opposite sides of said post support member for holding said bar against rotation at said positions, a pair of spider arms extending rearwardly from the axis of said bar for carrying a seat with each spider arm spaced adjacent a respective one of said positions, a tube for each spider arm encircling said bar, means securing one end of each tube to a respective one of said spider arms to prevent relative rotation between each spider arm and the respective tube end, and means securing the opposite end of each tube independently of the other tube nonrotatably to a respective end of said bar whereby said bar is stressed separately between each position and a respective end of said bar in response to pivotal movement of said spider arms about the axis of said bar with the portion of said bar between said two positions serving to isolate the stresses in one portion of said bar from stresses in the other portion of said bar.
Claim 3
Dependent Claim
39 words
The chair control claimed in claim 1 in which said post support fixed means are fixed to said bar at positions spaced axially of said bar substantially 1 inch on opposite sides of the center of said support member.
Claim 4
Dependent Claim
91 words
In the chair control claimed in claim 2, a back support, means pivotally interconnecting said back support and said spider arms along an axis located rearwardly of said torsion bar, a pivot pin for said back support for enabling said back support to pivot at a different angle than said spider arms about an axis located intermediate said bar and said rearwardly located axis, and means integrally formed on said means fixed to said post support extending rearwardly of said torsion bar and anchored to said pivot pin at spaced positions.
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |