Patent US3446211A successfully refreshed from Google Patents.
US3880388A
Expired / Lapsed
US
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Leg type support with automatic adjustment
Assignee: TEST D ETUDES SA
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Filing: 1973-04-20
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Granted: 1975-04-29
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Expires: 1993-04-20
Abstract
Abstract A leg-type support with automatic length adjustment having at least two vertically movable supporting elements which are coupled by a transmission means so arranged that one of the supporting elements descends when the other is pushed upwardly. The transmission means comprises thrust elements accommodated in a tubular enclosure such that relative movement of the thrust elements results in alternative elongation and contraction phases of the effective length of the transmission means so that when the supporting elements are both retained pronounced locking positions are obtained which correspond to the contraction phases of the transmission means.
Inventors
- 👤 Rene Beguin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:01
CPC Classifications
F; F16; F16M; F16M11/00; F16M11/20; F16M11/24; F16M11/40; A; A47; A47B; A47B91/00; A47B91/16; A47C; A47C3/00; E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; F16M11/02; F16M11/18; F16M7/00; F16M2200/00; F16M2200/02; F16M2200/025; F16M2200/027; F16M2200/028
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A leg-type support with automatic adjustment, comprising at least two vertically movable supporting elements and a transmission means coupling the supporting elements and so arranged that one of the supporting elements descends when the other is pushed upwardly, the transmission means consisting of balls and a tubular guide accommodating the balls and having at least one constriction, the balls changing their relative positions on the combined movement of the supporting elements, and the tubular guide being so designed that the relative movement of the balls results in alternate elongation and contraction phases of the effective length of the transmission means so that, when the supporting elements are both retained, pronounced locking positions are obtained which correspond to the contraction phases of the transmission means.
Claim 2
Dependent Claim
124 words
A leg-type support with automatic adjustment, comprising at least two vertically movable supporting elements and a transmission means coupling the supporting elements and so arranged that one of the supporting elements descends when the other is pushed upwardly, the transmission means consisting of balls and a tubular guide accommodating the balls and having at least one constriction, the balls changing their relative positions on the combined movement of the supporting elements, and the tubular guide being so designed that the relative movement of the balls results in alternate elongation and contraction phases of the effective length of the transmission means so that, when the supporting elements are both retained, pronounced locking positions are obtained which correspond to the contraction phases of the transmission means.
Claim 3
Dependent Claim
235 words
A leg-type support with automatic adjustment, comprising at least two vertically movable supporting elements and a transmission means coupling the supporting elements and so arranged that one of the supporting elements descends when the other is pushed upwardly, the transmission means consisting of a chain comprising rigid links pivoted with respect to one another and a tubular guide accommodating the chain and having at least one abrupt constriction, the chain links changing their relative positions on the combined movement of the supporting elements, and the tubular guide being so designed that the relative movement of the chain links results in alternate elongation and contraction phases of the effective length of the transmission means so that, when the supporting elements are both retained, pronounced locking positions are obtained which correspond to the contraction phases of the transmission means, the tubular guide having the general shape of a U and two ends, the two supporting elements being telescopically slidable in the guide ends, the abrupt constriction being designed to permit the chain to pass therethrough with play in the absence of pressure on the chain, and the length of each chain link and the inner diameter of the tubular guide at the abrupt constriction being such that pressure on the chain causes pivoting of a respective link at the abrupt constriction and a corresponding spreading of the chain in the tubular guide at the abrupt constriction thereof.
Claim 4
Dependent Claim
235 words
A leg-type support with automatic adjustment, comprising at least two vertically movable supporting elements and a transmission means coupling the supporting elements and so arranged that one of the supporting elements descends when the other is pushed upwardly, the transmission means consisting of a chain comprising rigid links pivoted with respect to one another and a tubular guide accommodating the chain and having at least one abrupt constriction, the chain links changing their relative positions on the combined movement of the supporting elements, and the tubular guide being so designed that the relative movement of the chain links results in alternate elongation and contraction phases of the effective length of the transmission means so that, when the supporting elements are both retained, pronounced locking positions are obtained which correspond to the contraction phases of the transmission means, the tubular guide having the general shape of a U and two ends, the two supporting elements being telescopically slidable in the guide ends, the abrupt constriction being designed to permit the chain to pass therethrough with play in the absence of pressure on the chain, and the length of each chain link and the inner diameter of the tubular guide at the abrupt constriction being such that pressure on the chain causes pivoting of a respective link at the abrupt constriction and a corresponding spreading of the chain in the tubular guide at the abrupt constriction thereof.
Claim 5
Dependent Claim
20 words
The support of claim 2, in which the tubular guide has two of said constrictions each of approximately 90* .
Claim 6
Dependent Claim
21 words
The support of claim 2 in which the tubular guide has two of said constrictions each of 80* to 100* .
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |