US3604716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tightening seal
Assignee: Individual
•
Filing: 1969-12-02
•
Granted: 1971-09-14
•
Expires: 1989-12-02
Abstract
Abstract The seal produces a self-tightening action as a function of temperature particularly when the temperature is low. It comprises external deformable packing element and a core formed by two metals with different expansion coefficient, these metals being disposed in such a way that the metal with higher expansion coefficient is near the packing element and that, when the temperature decreases, the differential expansion of the two metals produces an expansion of the core toward this packing.
Inventors
- 👤 Jacques Webert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
F; F17; F17C; F17C13/00; F16; F16J; F16J15/00; F16J15/16; F16J15/164; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2203/00; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2203/0634; F17C2203/0636; Y; Y10; Y10S; Y10S277/00; Y10S277/931; Y10S277/932
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A self-tightening seal which comprises a deformable external packing element and a core formed of at least two metals having a different coefficient of expansion, a metal having a high coefficient of expansion being placed opposite to the packing element and a metal having a low coefficient of expansion being superposed on and intimately bonded to the first so that the differential expansion of said metals under the effect of a reduction in heat causes deformation of said packing element, said core being a helically wound bimetallic core, the metal which has a low coefficient of expansion being at the center, said core being within the interior of a flexible sheath.
Claim 2
Dependent Claim
111 words
A self-tightening seal which comprises a deformable external packing element and a core formed of at least two metals having a different coefficient of expansion, a metal having a high coefficient of expansion being placed opposite to the packing element and a metal having a low coefficient of expansion being superposed on and intimately bonded to the first so that the differential expansion of said metals under the effect of a reduction in heat causes deformation of said packing element, said core being a helically wound bimetallic core, the metal which has a low coefficient of expansion being at the center, said core being within the interior of a flexible sheath.
Claim 3
Dependent Claim
18 words
A seal in accordance with claim 1, wherein the helically wound core and the flexible sheath are annular.
Claim 4
Dependent Claim
130 words
A self-tightening seal which comprises a deformable external packing element and a core formed of at least two metals having a different coefficient of expansion, a metal having a high coefficient of expansion being placed opposite to the packing element and a metal having a low coefficient of expansion being superposed on and intimately bonded to the first so that the differential expansion of said metals under the effect of a reduction in heat causes deformation of said packing element comprising a ring adapted to carry strips which are cut obliquely in the direction of rolling of the bimetal and twisted as a result of any temperature variation and an external packing element in the form of a sheath whose parallel walls are thrust outwards by each of said strips.
Claim 5
Dependent Claim
130 words
A self-tightening seal which comprises a deformable external packing element and a core formed of at least two metals having a different coefficient of expansion, a metal having a high coefficient of expansion being placed opposite to the packing element and a metal having a low coefficient of expansion being superposed on and intimately bonded to the first so that the differential expansion of said metals under the effect of a reduction in heat causes deformation of said packing element comprising a ring adapted to carry strips which are cut obliquely in the direction of rolling of the bimetal and twisted as a result of any temperature variation and an external packing element in the form of a sheath whose parallel walls are thrust outwards by each of said strips.
Claim 6
Dependent Claim
21 words
A seal in accordance with claim 3, wherein the sheath which forms a packing element has an open transverse 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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |