US5120078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel laminate gasket with engine block protecting device
Assignee: Ishikawa Gasket Co Ltd
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Filing: 1989-06-15
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Granted: 1992-06-09
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Expires: 2009-06-15
Abstract
Abstract A steel laminate gasket of the invention is installed in an internal combustion engine having at least one hole to be sealed. The gasket comprises first and second plates, at least one middle plate situated between the first and second plates, and a cover member situated outside the hole of the engine to surround the same. A ring member is situated adjacent to the cover member. At least one protecting plate is placed over the ring member and at least a part of the middle plate. The protecting plate is made of a material harder than the ring member. Therefore, when the gasket is tightened, the gasket and the engine blocks do not deform, and wide and strong sealing pressure is obtained.
Inventors
- 👤 Tsunekazu Udagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:15
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/0818; F16J15/0825; F16J2015/0837; F16J2015/0862
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
208 words
A steel laminate gasket for an internal combustion engine having at least one hole to be sealed, comprising: a first plate including at least one first hole having a size equal to or greater than that corresponding to the hole of the entire, a second plate situated under the first plate and including at least one second hole having a size equal to or greater than that corresponding to the hole of the engine, at least one middle plate situated between the first and second plates and having at least one third hole greater than the hole of the engine a cover member situated outside the hole of the engine to surround the same and engaging the first and second plates, a ring member for sealing around the hole of the engine, said ring member being situated outside the cover member relative to the hole of the engine and partly covered by the cover member, and at least one protecting plate situated over the ring member and at least a part of the middle plate, said protecting plate being made of a material harder than that of the ring member so that when the gasket is tightened, a portion corresponding to the ring member does not project outwardly.
Claim 2
Dependent Claim
208 words
A steel laminate gasket for an internal combustion engine having at least one hole to be sealed, comprising: a first plate including at least one first hole having a size equal to or greater than that corresponding to the hole of the entire, a second plate situated under the first plate and including at least one second hole having a size equal to or greater than that corresponding to the hole of the engine, at least one middle plate situated between the first and second plates and having at least one third hole greater than the hole of the engine a cover member situated outside the hole of the engine to surround the same and engaging the first and second plates, a ring member for sealing around the hole of the engine, said ring member being situated outside the cover member relative to the hole of the engine and partly covered by the cover member, and at least one protecting plate situated over the ring member and at least a part of the middle plate, said protecting plate being made of a material harder than that of the ring member so that when the gasket is tightened, a portion corresponding to the ring member does not project outwardly.
Claim 3
Dependent Claim
19 words
A steel laminate gasket according to claim 1, wherein said protecting plate is in the shape of an annulus.
Claim 4
Dependent Claim
30 words
A steel laminate gasket according to claim 2, wherein a plurality of protecting plates are installed in the gasket, the protecting plates adjacent to each other being integrally connected together.
Claim 5
Dependent Claim
42 words
A steel laminate gasket according to claim 3, wherein said cover member is integrally connected to the first plate, said cover member having a curved portion extending toward the second plate and a flange situated outside a part of the second plate.
Claim 6
Dependent Claim
21 words
A steel laminate gasket according to claim 1, wherein said protecting plate extends substantially throughout the entire area of the gasket.
Claim 7
Dependent Claim
19 words
A steel laminate gasket according to claim 5, wherein said middle plate is integrally formed with the protecting plate.
Claim 8
Dependent Claim
42 words
A steel laminate gasket according to claim 6, wherein said cover member is integrally connected to the first plate, said cover member having a curved portion extending toward the second plate and a flange situated outside a part of the second plate.
Claim 9
Dependent Claim
46 words
A steel laminate gasket according to claim 5, wherein said first plate is integrally formed with the protecting plate, said cover member being a grommet having a curved portion, an upper flange situated above the first plate and a lower flange situated under the second plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |