Patent US3656770A successfully refreshed from Google Patents.
US3656770A
Expired / Lapsed
US
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Piston
Assignee: Daimler Benz AG
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Filing: 1970-01-23
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Granted: 1972-04-18
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Expires: 1990-01-23
Abstract
Abstract A piston in which the piston ring arranged in the groove following the piston top land is securely supported by a piston ring support that consists of an annular disc retained under stress with its inner circumference at the piston, and more particularly between the upper edge of the piston ring groove and the piston ring itself.
Inventors
- 👤 Heinrich Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A piston in which a piston ring with a piston ring support is arranged in the piston ring groove following the piston top land, characterized in that the piston ring support consists of an annular disc which is provided with alternate web portions and recesses along its internal circumference and is retained under stress with its internal circumference retained in the piston only at the web portions thereof between the recesses between the upper edge of the piston ring groove and the upper surface of a second groove adjacent said piston ring groove and extending inward therefrom.
Claim 2
Dependent Claim
97 words
A piston in which a piston ring with a piston ring support is arranged in the piston ring groove following the piston top land, characterized in that the piston ring support consists of an annular disc which is provided with alternate web portions and recesses along its internal circumference and is retained under stress with its internal circumference retained in the piston only at the web portions thereof between the recesses between the upper edge of the piston ring groove and the upper surface of a second groove adjacent said piston ring groove and extending inward therefrom.
Claim 3
Dependent Claim
18 words
A piston according to claim 1, characterized in that the piston ring support is of essentially rectangular cross-section.
Claim 4
Dependent Claim
26 words
A piston according to claim 1, characterized in that the piston ring support is provided with a slot between its inner circumference and its outer circumference.
Claim 5
Dependent Claim
16 words
A piston according to claim 2, characterized in that said recesses are of substantially semi-circular shape.
Claim 6
Dependent Claim
25 words
A piston according to claim 4, characterized in that the outer diameter of the piston ring support is smaller than the diameter of the piston.
Claim 7
Dependent Claim
16 words
A piston according to claim 1, characterized in that said recesses are of substantially semi-circular shape.
Claim 8
Dependent Claim
25 words
A piston according to claim 1, characterized in that the outer diameter of the piston ring support is smaller than the diameter of the piston.
References Cited (Backward Citations)
US2415984A
Cited
US2996342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |