US3722897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circumferentially expansible oil ring
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-06-25
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Granted: 1973-03-27
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Expires: 1990-06-25
Abstract
Abstract A circumferentially expansible oil control channel type piston ring composed of individual linked together circumferential ring portions or units. Each circumferential ring portion or unit has axially spaced top and bottom segments with outer peripheral edges providing scraping surfaces to ride on the cylinder wall. The segments of each unit are connected by an upstanding leg on the inner periphery of the ring. A spring finger extends from the leg of each portion between the segments of the next adjacent portion and terminates in an upstanding strut with ends seated in holes or recesses of the segments of the adjacent portion to link the portions together. The upstanding struts have shoulders supporting the segments against axial collapse. The ring is continuous and the holes or recesses receiving the ends of the struts are oversized to allow appreciable expansion of the ring so that it may fit over a piston head and snap into the ring groove of the piston. The ends of the struts abut the walls of the recesses or holes before the ring reaches its operating diameter so that further contraction can only be accommodated by deflection of the spring fingers, thereby providing a circumferentially expansible spring ring especially suited for the oil control ring of an internal combustion engine piston.
Inventors
- 👤 A Brenneke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:09
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/12; F16J9/20; F16J9/206; F16J9/203
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A circumferentially expansible piston ring comprising a plurality of individual circumferentially separated ring units, each unit being of one piece having at least one integral spring portion and at least one integral linking portion, each unit linked to an adjacent unit through a mechanical interlock by a linking portion, and having non-spring portions remote from the linking portion.
Claim 2
Dependent Claim
58 words
A circumferentially expansible piston ring comprising a plurality of individual circumferentially separated ring units, each unit being of one piece having at least one integral spring portion and at least one integral linking portion, each unit linked to an adjacent unit through a mechanical interlock by a linking portion, and having non-spring portions remote from the linking portion.
Claim 3
Dependent Claim
61 words
The ring of claim 1 wherein each unit has a top and bottom radially extending crown, an upstanding leg on the inner periphery connecting the crowns, a spring finger extending circumferentially from one side of the leg, an upstanding strut on the end of the spring finger in the channel between the crowns and recesses receiving the ends of the strut.
Claim 4
Dependent Claim
27 words
The ring of claim 1 wherein each individual ring unit has top and bottom radially extending crowns in circumferentially offset relation defining an outwardly opening channel therebetween.
Claim 5
Dependent Claim
115 words
A channel type circumferentially expansible oil ring for pistons which comprises a continuous ring of circumferentially separated individual ring units, each unit having top and bottom crowns providing the scraping edges for the channel ring, an axially extending leg connecting the top crown with the bottom crown of each unit in circumferentially offset relation, each unit having a spring finger extending therefrom into the channel of the next adjacent unit, an upstanding strut on the end of each spring finger, recesses in each unit recEiving the ends of the strut of the adjacent unit linking the units together, and shoulders on the struts engaging the crowns to hold the crowns in axially spaced parallel relation.
Claim 6
Dependent Claim
115 words
A channel type circumferentially expansible oil ring for pistons which comprises a continuous ring of circumferentially separated individual ring units, each unit having top and bottom crowns providing the scraping edges for the channel ring, an axially extending leg connecting the top crown with the bottom crown of each unit in circumferentially offset relation, each unit having a spring finger extending therefrom into the channel of the next adjacent unit, an upstanding strut on the end of each spring finger, recesses in each unit recEiving the ends of the strut of the adjacent unit linking the units together, and shoulders on the struts engaging the crowns to hold the crowns in axially spaced parallel relation.
Claim 7
Dependent Claim
40 words
The piston ring of claim 4 wherein the strut of one unit fits freely in the recesses of the adjacent unit to accommodate expansion of the ring for fitting over the head of a piston without overstressing the spring fingers.
Claim 8
Dependent Claim
32 words
An oil control piston ring comprising a continuous ring of linked together individual one-piece circumferential units, each unit having an integral spring and linking portion consisting of less than the entire unit.
Claim 9
Dependent Claim
32 words
An oil control piston ring comprising a continuous ring of linked together individual one-piece circumferential units, each unit having an integral spring and linking portion consisting of less than the entire unit.
Claim 10
Dependent Claim
19 words
The ring of claim 3 wherein each unit has radially extending top and bottom crowns in circumferentially offset relation.
Claim 11
Dependent Claim
67 words
An outwardly opening channel piston ring comprising a plurality of individual separate one-piece ring units each unit having top and bottom radially extending crowns for riding on the side walls of a piston ring groove and providing peripheral scraping edges for riding on a cylinder wall, upstanding leg means connecting the crowns in axially spaced relation, and spring means linking the units into a circumferentially expansible spring.
Claim 12
Dependent Claim
67 words
An outwardly opening channel piston ring comprising a plurality of individual separate one-piece ring units each unit having top and bottom radially extending crowns for riding on the side walls of a piston ring groove and providing peripheral scraping edges for riding on a cylinder wall, upstanding leg means connecting the crowns in axially spaced relation, and spring means linking the units into a circumferentially expansible spring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |