Patent US3837705A successfully refreshed from Google Patents.
US3837705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Office chair
Assignee: Olivetti SpA
•
Filing: 1973-01-24
•
Granted: 1974-09-24
•
Expires: 1993-01-24
Abstract
Abstract An office chair in which the seat height and back inclination and height are adjustable and having a frictional pivotal coupling between the back and the back supporting member. The adjustment of the back inclination is accomplished with a hub affixed to the back supporting member and a slider disposed for axial motion within said hub and angularly fixed with respect to the chair seat. A pair of projections in the slider ride in helical grooves in the hub so that as the slider is moved axially the back is rotated. A rack attached to the back and slidable in the back supporting member is engaged by a spiral gear member attached to the back supporting member for controlling the height of the back.
Inventors
- 👤 F Marraccini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:39
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/025; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A chair comprising: a seat; a back; and means connecting the seat and the back for selectively adjusting the distance between the seat and the back, said means comprising a hollow member, a toothed rack connected to said back and slidable in said hollow member, a rotatable disc having an annular groove on the periphery thereof, a projection extending from one side of said disc for manually rotating same, a spiral rib projecting from another side of said disc opposite to said one side, means mounting said disc in an inclined position with respect to said rack to enable a tooth of said rack to engage with only the portion of said spiral rib inclined towards said rack, and means solely in contact with said disc for rotatably mounting same on said hollow member comprising a guide element fixed to said hollow member and engaging said annular groove on the periphery of said disc.
Claim 2
Dependent Claim
154 words
A chair comprising: a seat; a back; and means connecting the seat and the back for selectively adjusting the distance between the seat and the back, said means comprising a hollow member, a toothed rack connected to said back and slidable in said hollow member, a rotatable disc having an annular groove on the periphery thereof, a projection extending from one side of said disc for manually rotating same, a spiral rib projecting from another side of said disc opposite to said one side, means mounting said disc in an inclined position with respect to said rack to enable a tooth of said rack to engage with only the portion of said spiral rib inclined towards said rack, and means solely in contact with said disc for rotatably mounting same on said hollow member comprising a guide element fixed to said hollow member and engaging said annular groove on the periphery of said disc.
Claim 3
Dependent Claim
21 words
A chair according to claim 1, wherein the height of said spiral rib from said disc increases towards the center thereof.
Claim 4
Dependent Claim
19 words
A chair according to claim 1, wherein said guide element comprises an annular tooth which engages said annular groove.
Claim 5
Dependent Claim
37 words
A chair according to claim 2, wherein said hollow element is disposed adjacent to said back at a predetermined distance therefrom and said projection extends between said hollow element and said back less than said predetermined distance.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |