US3820799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient metal gasket
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1972-08-16
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Granted: 1974-06-28
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Expires: 1992-08-16
Abstract
Abstract The invention relates to a resilient metal gasket which has outstanding crushing and residual resilience properties. The gasket comprises a central core formed by a metal wire helical spring which is closed on itself and is toroidal in shape in the inoperative state. The spring is enclosed by a first resilient hard metal envelope which in turn is enclosed by a second independent envelope of a ductile metal. The two envelopes enclosing the spring both have the form of a toroidal surface whose generating circle includes a gap. The helical spring has continuous turns and its ends may be joined together by a short connecting element such as a second spring.
Inventors
- 👤 R Chevallereau
- 👤 M Moreau
- 👤 C Abbes
- 👤 S Bianchi
- 👤 C Rouaud
- 👤 H Royer
- 👤 J Rogemont
- 👤 R Roques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:51
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/16; F16L23/18; F16L23/20; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/0887; F16J15/0893
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A resilient metal gasket comprising a central core formed by a metal wire helical spring with continuous turns and high axial compressive stressing which is closed on itself and is toroidal in shape in the inoperative state; a first resilient hard metal envelope substantially covering the outer surface of the spring and having in the inoperative state the shape of a toroidal surface whose generating circle includes a gap, and a second independent envelope of ductile metal substantially covering the outer surface of the first envelope and having in the inoperative state the form of a toroidal surface whose generating circle includes a gap substantially coextensive with the first gap, said spring and said first and second envelopes disengaging when under load except in the areas of application of compression stressing.
Claim 2
Dependent Claim
131 words
A resilient metal gasket comprising a central core formed by a metal wire helical spring with continuous turns and high axial compressive stressing which is closed on itself and is toroidal in shape in the inoperative state; a first resilient hard metal envelope substantially covering the outer surface of the spring and having in the inoperative state the shape of a toroidal surface whose generating circle includes a gap, and a second independent envelope of ductile metal substantially covering the outer surface of the first envelope and having in the inoperative state the form of a toroidal surface whose generating circle includes a gap substantially coextensive with the first gap, said spring and said first and second envelopes disengaging when under load except in the areas of application of compression stressing.
Claim 3
Dependent Claim
14 words
A metal gasket as set forth in claim 1, having a closed circular outline.
Claim 4
Dependent Claim
20 words
A metal gasket as set forth in claim 1, having an outline of a rectilinear portion interconnected by curvilinear portions.
Claim 5
Dependent Claim
27 words
A metal gasket as set forth in claim 1, said second envelope being a ductile metal chosen from: the group consisting of aluminium, copper, nickel, and titanium.
Claim 6
Dependent Claim
52 words
A metal gasket as set forth in claim 1, said second envelope having a thickness of 0.4 to 0.5 mm, the first envelope having a thickness of 0.3 to 0.6 mm, and the ratio between the nominal diameter of the spring and the diameter of its metal wire being 6 to 11.
Claim 7
Dependent Claim
36 words
A metal gasket as set forth in claim 1, characterised in that the second envelope is of open C section when sectioned through a plane containing the axis of the torus formed by the central spring.
Claim 8
Dependent Claim
43 words
A metal gasket as set forth in claim 1, said second envelope having a section closed on itself whose ends partly overlap one another when under load, when sectioned through a plane containing the axis of the torus formed by the central spring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |