Patent US3727872A successfully refreshed from Google Patents.
US3727872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column of an office chair
Assignee: Individual
•
Filing: 1970-06-15
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Granted: 1973-04-17
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Expires: 1990-06-15
Abstract
Abstract A releasable lock of a tube telescope, variable as to its length, as a column of an office chair, which comprises a cone, and a column tube movable as to its height and having a longitudinal slot at its free lower end. Tongues are supported by the column tube and the cone is pressed in the locking position against the inner face of the tongues. The latter carry a nose member pointing towards the cone, whereby the line of the convex surface of the cone converges in the direction towards a seat of the chair.
Inventors
- 👤 A Spieth
- 👤 R Spieth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:24
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/28; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A releasable lock of a tube telescope, variable as to its length, as a column of an office chair, comprising a setting tube having a cone, a column, a column tube coaxially disposed relative to said setting tube and said column movable as to its height relative to said column and having longitudinal slits at its free lower end forming tongue portions, and clampingly lockingly and releasably cooperating with said column, said tongue portions formed with nose projections cooperating with and pointing towards said cone, said cone converging in an upward direction towards a seat of the chair, a setting lever pivotally connected to said column tube for up and down swinging, a sliding tube inside said column tube in which an end of said setting lever is frictionally mounted, and an eye formation operatively secured to said setting tube and in which said sliding tube is rollably disposed so as to disengage said cone from operatively pressing lockingly against said tongue portions when said setting lever is swung.
Claim 2
Dependent Claim
169 words
A releasable lock of a tube telescope, variable as to its length, as a column of an office chair, comprising a setting tube having a cone, a column, a column tube coaxially disposed relative to said setting tube and said column movable as to its height relative to said column and having longitudinal slits at its free lower end forming tongue portions, and clampingly lockingly and releasably cooperating with said column, said tongue portions formed with nose projections cooperating with and pointing towards said cone, said cone converging in an upward direction towards a seat of the chair, a setting lever pivotally connected to said column tube for up and down swinging, a sliding tube inside said column tube in which an end of said setting lever is frictionally mounted, and an eye formation operatively secured to said setting tube and in which said sliding tube is rollably disposed so as to disengage said cone from operatively pressing lockingly against said tongue portions when said setting lever is swung.
Claim 3
Dependent Claim
18 words
The releasable lock, as set forth in claim 1, said nose projection is impressed in said tongue portions.
Claim 4
Dependent Claim
24 words
The releasable lock, as set forth in claim 1, wherein said eye formation is annular in shape having an inwardly directed substantially semi-circular cross-section.
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 |