Patent US3910544A successfully refreshed from Google Patents.
US3910544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair control adjustable post
Assignee: Individual
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Filing: 1974-01-28
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Granted: 1975-10-07
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Expires: 1994-01-28
Abstract
Abstract A swivel chair or stool with a single, partly threaded stem or post supporting a seat centrally on a base, and with a bearing ball disposed in recesses in the facing spaced apart surfaces of the seat and the top end of the stem. A circumferential groove is provided in the upper portion of the stem which is journaled in a tubular member depending from the seat, with a thumb screw extending through the wall of said tubular member into said groove to prevent removal of the seat from the stem and, when tightened, to lock the seat and stem against relative rotation. The threaded portion of the stem extends into the base and is threadedly engaged by a manually operable adjustment collar for regulating the height of the seat above the base.
Inventors
- 👤 Carl J Engstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:45
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/24; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/441; A47C7/443
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
403 words
A swivel seat comprising a base, a seat, a vertical stem supporting said seat upon said base, a tubular member attached to the underside of said seat having a closed top end and extending downwardly therefrom in surrounding relation to the upper portion of said stem, the top end of said tubular member and the upper end of said stem having aligned ball receiving recesses, a ball bearing between the upper end of the stem and the top end of said tubular member riding in said recesses, said stem having a first circumferential groove adjacent said upper end thereof, a combination locking and retaining screw threaded through said tubular member and projecting into said first circumferential groove to maintain the ball in said recesses and to lock the stem and tubular member for co-rotation, a bearing ring around said stem riding in the bottom end portion of the tubular member to align the stem and tubular member, the lower end of said stem being circular in cross section to define a smooth surface, said smooth surface being interrupted only by a pair of threaded portions spaced apart by a second circumferential groove, said base having a hub with a sleeve providing an elongated bore receiving the threaded portions of the stem in sliding contact therewith to hold the stem in upright position on the base, said sleeve having an outturned end flange on the upper end thereof spaced from said hub, a manually rotatable adjustment collar threaded onto the lower end of said stem, said adjustment collar including an inverted cup shaped metal member with an aperture through the top end wall thereof larger than the stem with a nut secured to the underside of said top end wall, said nut being threaded onto said stem and resting directly on said outturned flange of said sleeve, a screw threaded through said cup shaped member underlying said outturned flange to limit lifting of the stem out of the sleeve of the base, said adjustment collar being located above said second circumferential groove, whereby said seat is freely rotatable on said stem when said combination locking and retaining screw is loose in said first groove and rotatable with said stem when tightened in said first groove and said stem is raised and lowered in said sleeve by rotation of said adjustment collar to and from a height aligning the second groove with the adjustment collar.
Claim 2
Dependent Claim
403 words
A swivel seat comprising a base, a seat, a vertical stem supporting said seat upon said base, a tubular member attached to the underside of said seat having a closed top end and extending downwardly therefrom in surrounding relation to the upper portion of said stem, the top end of said tubular member and the upper end of said stem having aligned ball receiving recesses, a ball bearing between the upper end of the stem and the top end of said tubular member riding in said recesses, said stem having a first circumferential groove adjacent said upper end thereof, a combination locking and retaining screw threaded through said tubular member and projecting into said first circumferential groove to maintain the ball in said recesses and to lock the stem and tubular member for co-rotation, a bearing ring around said stem riding in the bottom end portion of the tubular member to align the stem and tubular member, the lower end of said stem being circular in cross section to define a smooth surface, said smooth surface being interrupted only by a pair of threaded portions spaced apart by a second circumferential groove, said base having a hub with a sleeve providing an elongated bore receiving the threaded portions of the stem in sliding contact therewith to hold the stem in upright position on the base, said sleeve having an outturned end flange on the upper end thereof spaced from said hub, a manually rotatable adjustment collar threaded onto the lower end of said stem, said adjustment collar including an inverted cup shaped metal member with an aperture through the top end wall thereof larger than the stem with a nut secured to the underside of said top end wall, said nut being threaded onto said stem and resting directly on said outturned flange of said sleeve, a screw threaded through said cup shaped member underlying said outturned flange to limit lifting of the stem out of the sleeve of the base, said adjustment collar being located above said second circumferential groove, whereby said seat is freely rotatable on said stem when said combination locking and retaining screw is loose in said first groove and rotatable with said stem when tightened in said first groove and said stem is raised and lowered in said sleeve by rotation of said adjustment collar to and from a height aligning the second groove with the adjustment collar.
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |