Patent US4140096A successfully refreshed from Google Patents.
US4140096A
Expired / Lapsed
US
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Pistons for internal combustion engines
Assignee: Perkins Ltd
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Filing: 1977-03-30
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Granted: 1979-02-20
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Expires: 1997-03-30
Abstract
Abstract A piston for an internal combustion engine, having a combustion chamber with an overhanging lip formed by resistant metal insert anchored in the piston by means of members extending from the insert and embedded in the piston material. A portion of the free end of each member is located in a cool portion of the piston and mechanically keyed therein and is preferably also metallurgically bonded to the piston material in order to prevent the insert being loosened during service.
Inventors
- 👤 Stephen J. Dunn
- 👤 Glyn H. Youdan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/005; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0636; F02F; F02F3/00; F02F3/02; F02B23/0603; F02B2023/0612; F02B23/0645; F02B23/0654; F02B3/00; F02B3/06; F02F2200/00; F02F2200/04; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2251/00; F05C2251/04; F05C2251/042; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A piston for an internal combustion engine comprising a piston body of a first metal, a crown in said piston body, a combustion chamber in said crown, a lip portion overhanging said combustion chamber, said lip portion being constituted by an annular insert of a second metal more resistant to operating conditions in said chamber than said first metal, limbs of a third metal secured at one end to the annular insert comprising at least one member embedded in said body and extending from said insert into a portion of said body having a temperature of about 150 degrees centigrade at maximum operating temperature of said piston.
Claim 2
Dependent Claim
107 words
A piston for an internal combustion engine comprising a piston body of a first metal, a crown in said piston body, a combustion chamber in said crown, a lip portion overhanging said combustion chamber, said lip portion being constituted by an annular insert of a second metal more resistant to operating conditions in said chamber than said first metal, limbs of a third metal secured at one end to the annular insert comprising at least one member embedded in said body and extending from said insert into a portion of said body having a temperature of about 150 degrees centigrade at maximum operating temperature of said piston.
Claim 3
Dependent Claim
30 words
A piston according to claim 1 wherein, said annular insert metal is capable of forming a metallurgical bond with the first metal when coated with a bonding metal or agent.
Claim 4
Dependent Claim
39 words
A piston according to claim 1 wherein the said annular insert is made from a copper base alloy selected from a group consisting of 0.5% beryllium, 2.5% cobalt, remainder copper, 8% aluminium remainder copper, and 2% nickel remainder copper.
Claim 5
Dependent Claim
40 words
A piston according to claim 1 wherein the said limb is made from a ferrous material selected from the group consisting of a cast iron containing 3% carbon, 14% nickel, 7% copper, 3% cobalt remainder iron, and an austenitic steel.
Claim 6
Dependent Claim
40 words
A piston according to claim 1 wherein the said insert is made from a ferrous material selected from the group consisting of a cast iron containing 3% carbon, 14% nickel, 7% copper, 3% cobalt remainder iron, and an austenitic steel.
Claim 7
Dependent Claim
16 words
A piston according to claim 1 wherein the limbs are made integrally with the annular insert.
Claim 8
Dependent Claim
61 words
A piston according to claim 1 wherein said anchoring means consists of a ferrous material selected from the group consisting of a cast iron containing 3% carbon, 14% nickel, 7% copper, 3% cobalt remainder iron and an austenitic steel, and said anchoring means is coated with a bonding metal selected from the group consisting of aluminium silicon alloy, zinc and nickel.
Claim 9
Dependent Claim
55 words
A piston according to claim 1 wherein said anchoring means consists of a copper alloy selected from a group consisting of 0.5% beryllium, 2.5% cobalt remainder copper, 8% aluminium remainder copper, and 2% nickel remainder copper, and said anchoring means is coated with a bonding metal selected from the group consisting of zinc and nickel.
References Cited (Backward Citations)
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |