Patent US3727871A successfully refreshed from Google Patents.
US3727871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat-height adjustment device
Assignee: Individual
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Filing: 1972-04-14
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Granted: 1973-04-17
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Expires: 1992-04-14
Abstract
Abstract A seat-height adjustment device for a swivel chair including a clutch and upper and lower telescoping tubes. The tubes receive and cover the threaded spindle, hollow post, and bell nut of the chair. The clutch means is actuated by upward movement of the lower tube to releasably lock the bell nut for axial movement relative to the spindle upon a turning of the seat of the chair.
Inventors
- 👤 H Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:10
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A seat-height adjustment device for a swivel chair including a seat, a threaded spindle secured at its upper end to said seat for turning therewith and a base structure including a vertically extending hollow post for receiving a lower end of said spindle to turn therein with said seat, said device comprising: a nut on said spindle for bearing and turning on a top of said post to limit axial travel of said spindle in said post and hence define the height of said seat above said base; telescoping upper and lower tubes for receiving and covering said threaded spindle, nut, and post; and manually operable clutch means for selectively connecting said lower tube to said nut to turn therewith relative to said spindle with a turning of said seat whereby said nut moves axially on said spindle to adjust the height of said seat relative to said base.
Claim 2
Dependent Claim
149 words
A seat-height adjustment device for a swivel chair including a seat, a threaded spindle secured at its upper end to said seat for turning therewith and a base structure including a vertically extending hollow post for receiving a lower end of said spindle to turn therein with said seat, said device comprising: a nut on said spindle for bearing and turning on a top of said post to limit axial travel of said spindle in said post and hence define the height of said seat above said base; telescoping upper and lower tubes for receiving and covering said threaded spindle, nut, and post; and manually operable clutch means for selectively connecting said lower tube to said nut to turn therewith relative to said spindle with a turning of said seat whereby said nut moves axially on said spindle to adjust the height of said seat relative to said base.
Claim 3
Dependent Claim
46 words
The seat-height adjustment device of claim 1 wherein said clutch means includes interlocking means extending downwardly from said nut and upwardly from said lower tube for mating upon upward movement of said lower tube relative to said nut to lock said lower tube to said nut.
Claim 4
Dependent Claim
62 words
The seat-height adjustment device of claim 2 further including bearing means for said nut on top of said post including a sleeve bearing seated in a top of said post and including an annular flange bearing on top of said post, and an annular thrust bearing riding on top of said annular flange and supporting said nut for turning on said post.
Claim 5
Dependent Claim
78 words
The seat-height adjustment device of claim 1 wherein: said base includes a plurality of legs extending radially from said hollow post at a bottom thereof; and said lower tube includes a plurality of open bottom slots for receiving said legs around said post such that said lower tube covers the connection of said legs to said post and said lower tube connects to said base to turn therewith relative to said spindle when said clutch means is engaged.
Claim 6
Dependent Claim
106 words
The seat-height adjustment device of claim 1 wherein: said upper tube is supported by said spindle and extends into an open top of said lower tube which is normally supported on said base; and said clutch means comprises an annular skirt extending downwardly from said nut, a sleeve member secured in and coaxial with said lower tube for slidably receiving said hollow post to center said lower tube thereon, and interlocking means on a bottom of said skirt and a top of said sleeve for mating upon upward movement of said lower tube relative to said upper tube to lock said nut to said lower tube.
Claim 7
Dependent Claim
66 words
The seat-height adjustment device of claim 5 wherein: said sleeve member includes circumferentially spaced axially elongated inwardly extending guide portions for slidably engaging said post; and said interlock means comprises first lug means extending downward from said skirt and second lug means extending upward from said sleeve for mating with said first lug means upon upward movement of said lower tube relative to said upper tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |