Patent US3893675A successfully refreshed from Google Patents.
US3893675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing joints for piston rings
Assignee: SEALFIRE
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Filing: 1973-05-10
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Granted: 1975-07-08
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Expires: 1993-05-10
Abstract
Abstract Sealing joint associated with a piston ring for preventing the flow of fluids in piston groove. The sealing joint comprises an edging adapted to bear against that face of the ring which is opposite to the face in contact with the surface with which the piston ring cooperates.
Inventors
- 👤 Robert Geffroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:05
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A seal comprising an outer cylindrical member of an internal combustion engine, a piston adapted to reciprocate within said member and have one axial end subjected to internal combustion actuating pressure, a groove in the outer periphery of said piston, a ring assembly within said groove consisting of two pieces, one piece being a metal piston ring, the other piece being a plastic sealing joint having a cross section with Lshaped legs, one of said legs extending between adjacent surfaces of said ring and groove remote from said piston end and being adapted to contact said cylindrical member for sealing purposes, the other leg engaging the radially inner face of said metal ring, whereby peripheral wear of the sealing joint against said cylindrical member is limited to the wear of said metal ring, axial clearance between said ring assembly and the groove surface closest to said piston end providing a path for combustion pressure to act on adjacent surfaces of said metal ring and plastic joint.
Claim 2
Dependent Claim
166 words
A seal comprising an outer cylindrical member of an internal combustion engine, a piston adapted to reciprocate within said member and have one axial end subjected to internal combustion actuating pressure, a groove in the outer periphery of said piston, a ring assembly within said groove consisting of two pieces, one piece being a metal piston ring, the other piece being a plastic sealing joint having a cross section with Lshaped legs, one of said legs extending between adjacent surfaces of said ring and groove remote from said piston end and being adapted to contact said cylindrical member for sealing purposes, the other leg engaging the radially inner face of said metal ring, whereby peripheral wear of the sealing joint against said cylindrical member is limited to the wear of said metal ring, axial clearance between said ring assembly and the groove surface closest to said piston end providing a path for combustion pressure to act on adjacent surfaces of said metal ring and plastic joint.
Claim 3
Dependent Claim
41 words
The seal according to claim 1, further characterized by the fact that said other leg fills up, subject to the necessary allowance for thermal expansion, the available space between the piston groove bottom and said radially inner face of the ring.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |