US3704893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring
Assignee: KRIZMAN Inc
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Filing: 1970-09-04
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Granted: 1972-12-05
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Expires: 1990-09-04
Abstract
Abstract An internal combustion engine piston having a live head-land ring whose cross-section is imbalanced by differentiating it from a circumscribing circle whose diameter equals the maximum diagonal dimension to exterior corner points (which, in the case of a ring having a blunted corner or tapered face, will be the virtual corner point) of the ring when free and unconfined, so that more material is omitted within the inner-upper and outerlower quadrants than within the inner-lower and outer-upper quadrants, or vice versa, depending upon the sense in which torsional twist is desired when the ring is contracted to cylinder diameter.
Inventors
- 👤 Donald C Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:36
CPC Classifications
F; F16; F16J; F16J9/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
The combination with an internal combustion engine cylinder and piston having a head surface which, with the walls of said cylinder, circumscribe a combustion chamber, of a one piece live head-land piston ring having a free gap of approximately between 7 percent and 16 percent of the installed diameter, said ring having a cross-section of a type which may be controllably unbalanced, said cross-section being unbalanced in the direction such that as the gap in the ring is contracted the ring twists, and means for mounting said ring on said piston with its uppermost side surface entirely exposed to gases in said combustion chamber.
Claim 2
Dependent Claim
104 words
The combination with an internal combustion engine cylinder and piston having a head surface which, with the walls of said cylinder, circumscribe a combustion chamber, of a one piece live head-land piston ring having a free gap of approximately between 7 percent and 16 percent of the installed diameter, said ring having a cross-section of a type which may be controllably unbalanced, said cross-section being unbalanced in the direction such that as the gap in the ring is contracted the ring twists, and means for mounting said ring on said piston with its uppermost side surface entirely exposed to gases in said combustion chamber.
Claim 3
Dependent Claim
67 words
The combination of claim 1 wherein said means comprises a rib integral with, and extending circumferentially of, said piston at a substantial distance below said head surface, and a circumferentially extending channel on the inner periphery of said ring, said channel and said rib being shaped to interfit with freedom for relative circumferential and radial movement and with restraint against substantial relative movement in the axial direction.
Claim 4
Dependent Claim
18 words
The combination of claim 2 wherein said rib and said channel have cross-sectional shape of a truncated triangle.
Claim 5
Dependent Claim
19 words
The combination of claim 2 wherein said rib has a substantially greater outer circumference than does said head surface.
Claim 6
Dependent Claim
24 words
The combination of claim 4 wherein said ring has a flange overlying said rib and extending upward therefrom toward alignment with said head surface.
Claim 7
Dependent Claim
21 words
The combination of claim 1 wherein said upper side face of said ring is substantially aligned with said piston head surface.
Claim 8
Dependent Claim
33 words
The combination of claim 1 wherein said ring has oppositely oriented halved laps at said gap and movably bridging the same to obstruct the flow of gas from said cylinder past said ring.
Claim 9
Dependent Claim
123 words
The combination with a cylinder and a piston having a head surface which, with the walls of said cylinder, circumscribe a chamber, of a one-piece live head-land piston ring having a free gap of approximately between 7 percent and 16 percent of the installed diameter, said gap being substantially closed when said piston ring is installed in said cylinder to sealingly engage a peripheral surface of said cylinder, said piston ring having a cross-section of a type which may be controllably unbalanced, said cross-section being unbalanced in the direction such that as the gap in the ring is contracted the ring twists, and means for mounting said ring on said piston with its uppermost side surface entirely exposed to gases in said chamber.
Claim 10
Dependent Claim
123 words
The combination with a cylinder and a piston having a head surface which, with the walls of said cylinder, circumscribe a chamber, of a one-piece live head-land piston ring having a free gap of approximately between 7 percent and 16 percent of the installed diameter, said gap being substantially closed when said piston ring is installed in said cylinder to sealingly engage a peripheral surface of said cylinder, said piston ring having a cross-section of a type which may be controllably unbalanced, said cross-section being unbalanced in the direction such that as the gap in the ring is contracted the ring twists, and means for mounting said ring on said piston with its uppermost side surface entirely exposed to gases in said chamber.
Claim 11
Dependent Claim
79 words
The invention of claim 8 wherein the cross-section of said piston ring is T-shaped with the tongue of said T extending inwardly from the periphery of said ring and wherein approximately 4 percent more of the cross-bar of said T lies on one side of said tongue than lies on the other side of said tongue whereby a controlled amount of torsional twist exists in the cross-section of said ring when said ring is confined to said predetermined diameter.
Claim 12
Dependent Claim
38 words
The combination of claim 9 in which more of said bar lies above a radial plane bisecting said tongue than lies below said bisector whereby the ring has positive twist when contracted from its free and unconfined condition.
Claim 13
Dependent Claim
50 words
The piston ring of claim 9 wherein the portion of said bar lying on one side of said tongue is approximately 31 percent of the length of said bar and the portion lying on the other side of said tongue is approximately 27 percent of the length of said bar.
Claim 14
Dependent Claim
13 words
The combination of claim 8 wherein the cross-section of said ring is T-shaped.
Claim 15
Dependent Claim
13 words
The combination of claim 8 wherein the cross-section of said ring is U-shaped.
Claim 16
Dependent Claim
20 words
The combination of claim 13 wherein one leg of the U-shape is shorter than the other to produce a J-shape.
Claim 17
Dependent Claim
71 words
The invention of claim 8 wherein the cross-section of said piston ring is a substantially U-shaped configuration with the legs of said configuration extending radially inwardly from the periphery of said ring and wherein one of the legs of said configuration contains slightly more piston ring material than the other leg whereby a torsional stress exists in the cross-section of said ring when said ring is confined to said predetermined diameter.
Claim 18
Dependent Claim
20 words
The invention of claim 15 wherein the internal surfaces of the legs of said substantially U-shaPed cross-section are tapered outwardly.
Claim 19
Dependent Claim
16 words
The invention of claim 15 wherein said piston ring is made of Piston Ring Gray Iron.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |