US5161809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal gasket
Assignee: Nippon Leakless Industry Co Ltd
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Filing: 1991-06-25
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Granted: 1992-11-10
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Expires: 2011-06-25
Abstract
Abstract A metal gasket includes plural functional layers formed with embossments along peripheral edges of cylinder openings thereof and a backup plate not formed with any embossment and sandwiched between the functional layers. At least one edge plate is provided which is spaced radially within and is coplanar with peripheral edges of cylinder openings of the backup plate. The edge plate is different in thickness from, generally thinner than, the backup plate. Grommets are provided to fasten together the edge plate and portions of the functional layers overlapping the edge plate. With this arrangement, by selecting thicknesses of the edge plate and the backup plate so as to be different between them by a requisite value, surface pressure at peripheral edges of cylinder openings of the metal gasket can be set a desired value. Therefore, this metal gasket is superior in sealing performance and uniformity.
Inventors
- 👤 Yoshitaka Matsushita
- 👤 Yuji Takahashi
- 👤 Hideaki Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/0818; F16J15/0825; F16J2015/0837
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A metal gasket including plural functional layers formed with embossments along peripheral edges of cylinder openings thereof and a backup plate not formed with any embossment and fastened between the functional layers, wherein at least one edge plate having a certain width is provided radially inwardly within and spaced from and coplanar with peripheral edges of cylinder openings of the backup plate, said edge plate being different in thickness from the backup plate, and grommets that fasten together the peripheral edges of the cylinder openings of the functional layers, said embossments of the functional layers being full embossments which are roof-shaped in section and underlie the grommet and compress therebetween the edge plate.
Claim 2
Dependent Claim
113 words
A metal gasket including plural functional layers formed with embossments along peripheral edges of cylinder openings thereof and a backup plate not formed with any embossment and fastened between the functional layers, wherein at least one edge plate having a certain width is provided radially inwardly within and spaced from and coplanar with peripheral edges of cylinder openings of the backup plate, said edge plate being different in thickness from the backup plate, and grommets that fasten together the peripheral edges of the cylinder openings of the functional layers, said embossments of the functional layers being full embossments which are roof-shaped in section and underlie the grommet and compress therebetween the edge plate.
Claim 3
Dependent Claim
28 words
The metal gasket as set forth in claim 1, wherein said functional layers are formed with slightly tapered half embossments outwardly surrounding and separate from the full embossments.
Claim 4
Dependent Claim
30 words
The metal gasket as set forth in claim 1, wherein said grommets are provided to fasten together the edge plate and portions of the functional layers overlapping the edge plate.
Claim 5
Dependent Claim
33 words
The metal gasket as set forth in claim 1, wherein said edge plate is disposed between portions of said functional layers that extend radially inwardly of said cylinder openings beyond said backup plate.
Claim 6
Dependent Claim
98 words
A metal gasket including plural functional layers formed with embossments along peripheral edges of cylinder openings thereof and a backup plate not formed with any embossment and fastened between the functional layers, wherein at least one edge plate having a certain width is provided radially inwardly within and spaced from and coplanar with peripheral edges of cylinder openings of the backup plate, said edge plate being different in thickness from the backup plate, and grommets that fasten together the peripheral edges of the cylinder openings of the functional layers, the edge plate being thinner than the backup plate.
Claim 7
Dependent Claim
98 words
A metal gasket including plural functional layers formed with embossments along peripheral edges of cylinder openings thereof and a backup plate not formed with any embossment and fastened between the functional layers, wherein at least one edge plate having a certain width is provided radially inwardly within and spaced from and coplanar with peripheral edges of cylinder openings of the backup plate, said edge plate being different in thickness from the backup plate, and grommets that fasten together the peripheral edges of the cylinder openings of the functional layers, the edge plate being thinner than the backup plate.
References Cited (Backward Citations)
GB1260236A
Cited
GB1549200A
Cited
US4335890A
Cited
US4468044A
Cited
JPS62113968A
Cited
JPS62177363A
Cited
US4776073A
Cited
US4767124A
Cited
JPS63186950A
Cited
JPS63210464A
Cited
US4759585A
Cited
JPS6473156A
Cited
JPS6477740A
Cited
JPS6482563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |