US4473232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil scraper ring with controlled gap arrangement
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1983-10-19
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Granted: 1984-09-25
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Expires: 2003-10-19
Abstract
Abstract In an oil scraper ring in which an expander is arranged on the inner peripheral surface of an oil scraper ring proper, the oil scraper ring is manufactured to present the configuration of a perfect circle in its unstressed state with a free engaging gap cut into the ring.
Inventors
- 👤 Genkichi Umeha
- 👤 Takeji Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:53
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/061; F16J9/063; F16J9/062; F16J9/12; F16J9/20; F16J9/203
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
An oil scraper ring of the type having an outer peripheral surface, an inner peripheral surface and an expander and being insertable into a cylinder with its outer peripheral surface in contact with walls of said cylinder and urged against said cylinder walls under the force of said expander, said scraper ring having a gap formed therein in a freestanding unstressed state prior to insertion into said cylinder, said outer peripheral surface of said scraper ring being substantially circular in said unstressed state of said scraper ring.
Claim 2
Dependent Claim
87 words
An oil scraper ring of the type having an outer peripheral surface, an inner peripheral surface and an expander and being insertable into a cylinder with its outer peripheral surface in contact with walls of said cylinder and urged against said cylinder walls under the force of said expander, said scraper ring having a gap formed therein in a freestanding unstressed state prior to insertion into said cylinder, said outer peripheral surface of said scraper ring being substantially circular in said unstressed state of said scraper ring.
Claim 3
Dependent Claim
23 words
An oil scraper ring as claimed in claim 1, wherein a groove is formed in said inner peripheral surface for receiving said expander.
Claim 4
Dependent Claim
16 words
An oil scraper ring as claimed in claim 2, wherein said expander is a coiled expander.
Claim 5
Dependent Claim
16 words
An oil scraper ring as claimed in claim 1, wherein said expander is a plate expander.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |