US3628800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination circumferential expansion and spring finger oil control piston ring
Assignee: SPX Technologies Inc
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Filing: 1970-05-06
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Granted: 1971-12-21
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Expires: 1990-05-06
Abstract
Abstract A two component oil control piston ring accommodating wide tolerances in the dimensions of the components and having threering contact with the piston cylinder preventing cocking or tilting while increasing sealing efficiency. One of the components is a conventional thin rail ring and the other component is a spacer-expander ring carrying the rail ring and having two axially spaced cylinder-wall-engaging rings or scraping edges and upstanding spring fingers engaging the inner periphery of the rail ring. The spring fingers act independently of the contraction and expansion of the spacer-expander so that the peripheries of both rings may sealingly engage the cylinder wall regardless of radial depth variations of the rail ring.
Inventors
- 👤 Herbert F Prasse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:37
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/06; F16J9/064; F16J9/066; F16J9/069
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
A two component oil control piston ring having three peripheral scraping edges which comprises a circumferentially expansible and contractable spacer-expander ring having axially spaced ring portions with peripheral scraping edges, a rail ring supported on one of said ring portions, and spring fingers on the other of said ring portions acting independently of the expansion and contraction of the spacer-expander ring against the inner periphery of the rail ring in an axially and radially outward direction.
Claim 2
Dependent Claim
76 words
A two component oil control piston ring having three peripheral scraping edges which comprises a circumferentially expansible and contractable spacer-expander ring having axially spaced ring portions with peripheral scraping edges, a rail ring supported on one of said ring portions, and spring fingers on the other of said ring portions acting independently of the expansion and contraction of the spacer-expander ring against the inner periphery of the rail ring in an axially and radially outward direction.
Claim 3
Dependent Claim
124 words
An oil control piston ring comprising a circumferentially expansible and contractable spacer-expander having axially spaced peripheral rings each composed of a row of circumferentially spaced ring segments, the segments in one row being connected to adjacent segments in the other row by legs at spaced intervals around the inner periphery of the spacer-expander, spring fingers on the inner periphery of the segments of one row extending above the segments of the other row, said spring fingers being isolated from said legs to act independently of the expansion and contraction of the spacer-expander, a rail ring supported on the segments of the other row acted on by said spring fingers, and said rail ring and rows of spring segments providing three rings of scraping edges.
Claim 4
Dependent Claim
124 words
An oil control piston ring comprising a circumferentially expansible and contractable spacer-expander having axially spaced peripheral rings each composed of a row of circumferentially spaced ring segments, the segments in one row being connected to adjacent segments in the other row by legs at spaced intervals around the inner periphery of the spacer-expander, spring fingers on the inner periphery of the segments of one row extending above the segments of the other row, said spring fingers being isolated from said legs to act independently of the expansion and contraction of the spacer-expander, a rail ring supported on the segments of the other row acted on by said spring fingers, and said rail ring and rows of spring segments providing three rings of scraping edges.
Claim 5
Dependent Claim
116 words
A piston ring assembly comprising a circumferential spring ring having an outwardly opening channel defined by top and bottom rows of crowns providing two rings of cylinder wall scraping edges and upstanding legs at spaced intervals around the inner periphery of the spring ring connecting the crowns, spring fingers on the crowns of one row extending between some of the legs and projecting above the other row of crown to act independently of the circumferential expansion and contraction of said spring ring, and a rail ring supported on said other row of crowns engaged by said spring fingers around the inner periphery thereof to be urged against the cylinder wall and form a third scraping edge.
Claim 6
Dependent Claim
116 words
A piston ring assembly comprising a circumferential spring ring having an outwardly opening channel defined by top and bottom rows of crowns providing two rings of cylinder wall scraping edges and upstanding legs at spaced intervals around the inner periphery of the spring ring connecting the crowns, spring fingers on the crowns of one row extending between some of the legs and projecting above the other row of crown to act independently of the circumferential expansion and contraction of said spring ring, and a rail ring supported on said other row of crowns engaged by said spring fingers around the inner periphery thereof to be urged against the cylinder wall and form a third scraping edge.
Claim 7
Dependent Claim
83 words
A piston ring comprising a circumferential expansion spring ring of U-shaped cross section having two rings of axially spaced scraping edges, a rail ring mounted on one of said two rings, and spring fingers projecting from the other of said two rings engaging the inner periphery of the rail ring acting independently of the circumferential expansion and contraction of said spring ring to force the rail ring axially and radially outward for forming a third scraping edge and a ring groove side seal.
Claim 8
Dependent Claim
83 words
A piston ring comprising a circumferential expansion spring ring of U-shaped cross section having two rings of axially spaced scraping edges, a rail ring mounted on one of said two rings, and spring fingers projecting from the other of said two rings engaging the inner periphery of the rail ring acting independently of the circumferential expansion and contraction of said spring ring to force the rail ring axially and radially outward for forming a third scraping edge and a ring groove side seal.
Claim 9
Dependent Claim
68 words
A spacer-expander piston ring which comprises a circumferential spring ring of U-shape cross section having axially spaced rings of cylinder-wall-scraping edges connected by upstanding axiAlly extending legs at spaced intervals around the inner periphery of the spring ring, and spring fingers extending between some of said legs projecting from one ring above the other ring to act independently of the circumferential expansion and contraction of said spring ring.
Claim 10
Dependent Claim
68 words
A spacer-expander piston ring which comprises a circumferential spring ring of U-shape cross section having axially spaced rings of cylinder-wall-scraping edges connected by upstanding axiAlly extending legs at spaced intervals around the inner periphery of the spring ring, and spring fingers extending between some of said legs projecting from one ring above the other ring to act independently of the circumferential expansion and contraction of said spring ring.
Claim 11
Dependent Claim
27 words
The piston ring of claim 1 wherein each of the axially spaced ring portions of the spacer-expander ring is composed of a row of circumferentially spaced crowns.
Claim 12
Dependent Claim
30 words
The piston ring of claim 1 having axially extending circumferentially spaced legs connecting the ring portions of the spacer-expander ring with the spring fingers positioned between some of said legs.
Claim 13
Dependent Claim
23 words
The piston ring of claim 2 wherein the segments in said other row have notches in their inner periphery receiving the spring fingers.
Claim 14
Dependent Claim
25 words
The piston ring of claim 2 wherein the segments of said one row each have two legs and a spring finger between the two legs.
Claim 15
Dependent Claim
24 words
The piston ring of claim 3 wherein the crowns of one row have notched inner peripheral end portions providing recesses receiving the spring fingers.
Claim 16
Dependent Claim
18 words
The piston ring of claim 3 wherein the spring fingers have free ends radially outward from the legs.
Claim 17
Dependent Claim
18 words
The piston rings of claim 11 wherein the free ends of the spring fingers have rearwardly inclined lips.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |