US3554564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure backed piston rings
Assignee: Outboard Marine Corp
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Filing: 1968-06-12
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Granted: 1971-01-12
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Expires: 1988-06-12
Abstract
Abstract Disclosed herein is a piston ring and piston groove assembly which includes a wedge shaped piston ring positioned within a groove in a piston with the included angle between the top and bottom surfaces of the piston ring being less than the included angle between the top land and bottom land of the groove.
Inventors
- 👤 George G Lassanske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
F; F16; F16J; F16J9/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
An assembly comprising a piston having on its outer periphery a groove having a top land a and a bottom land, said bottom land extending approximately perpendicularly to the axis of said piston and at an acute angle to said top land, and a piston ring located in said groove and having a top surface, an outer generally cylindrical peripheral surface having an axis generally coinciding with the axis of the piston, and a bottom surface extending approximately perpendicularly to said outer peripheral surface and being acutely angularly related to said top surface at an acute angle less than the acute angle between said top and bottom lands of said groove.
Claim 2
Dependent Claim
111 words
An assembly comprising a piston having on its outer periphery a groove having a top land a and a bottom land, said bottom land extending approximately perpendicularly to the axis of said piston and at an acute angle to said top land, and a piston ring located in said groove and having a top surface, an outer generally cylindrical peripheral surface having an axis generally coinciding with the axis of the piston, and a bottom surface extending approximately perpendicularly to said outer peripheral surface and being acutely angularly related to said top surface at an acute angle less than the acute angle between said top and bottom lands of said groove.
Claim 3
Dependent Claim
29 words
An assembly according to claim 1 wherein said piston ring includes a top surface portion parallel to said bottom surface and extending radially inwardly from said outer peripheral surface.
Claim 4
Dependent Claim
197 words
An assembly comprising a piston with a groove defined by at least two surfaces including an upper land and a bottom land, said bottom land extending generally perpendicularly to the axis of said piston, and a ring positioned in said groove and having a generally cylindrical surface adapted to engage a cylinder wall, a top surface, and a bottom surface, said bottom surface extending generally perpendicularly to said cylindrical surface, one of said groove upper land and said ring top surface having an edge engageable with an intermediate portion of the other of said groove upper land and said ring top surface, said ring bottom surface being spaced relative to said ring top surface such that said ring top surface is axially spaced from said groove upper land when said ring bottom surface is engaged with said groove bottom land, and such that said ring bottom surface is axially spaced from said groove bottom land when said edge is engaged with said intermediate portion, and such that upon movement of said ring axially away from said groove bottom land, there is provided a space extending from said edge in the direction remote from said groove bottom land.
Claim 5
Dependent Claim
197 words
An assembly comprising a piston with a groove defined by at least two surfaces including an upper land and a bottom land, said bottom land extending generally perpendicularly to the axis of said piston, and a ring positioned in said groove and having a generally cylindrical surface adapted to engage a cylinder wall, a top surface, and a bottom surface, said bottom surface extending generally perpendicularly to said cylindrical surface, one of said groove upper land and said ring top surface having an edge engageable with an intermediate portion of the other of said groove upper land and said ring top surface, said ring bottom surface being spaced relative to said ring top surface such that said ring top surface is axially spaced from said groove upper land when said ring bottom surface is engaged with said groove bottom land, and such that said ring bottom surface is axially spaced from said groove bottom land when said edge is engaged with said intermediate portion, and such that upon movement of said ring axially away from said groove bottom land, there is provided a space extending from said edge in the direction remote from said groove bottom land.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |