US3877351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine piston
Assignee: Mahle GmbH
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Filing: 1973-06-22
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Granted: 1975-04-15
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Expires: 1993-06-22
Abstract
Abstract Internal combustion engine piston, particularly for diesel engines, with a bottom part and a top part which is connected separately thereto by means of an intermediate ring having a forked cross-section.
Inventors
- 👤 Eugen Barfiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:11
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/0023; F02F3/16; F02F3/20; F02F3/22; F02F3/28; F02B; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
An internal combustion engine piston including a lightweight metal lower part comprising the piston skirt, a piston crown connected with the piston skirt and comprising the upper part of the piston, which piston crown is formed from steel, two concentric integral annular ribs projecting from the inside face of the piston crown, a piston ring zone surrounding the piston crown, a cross-sectionally Y-shaped bifurcated annular intermediate ring of cast iron located between the upper and lower piston part, said ring including fork parts mating with said annular ribs respectively and a base part mating with said lower piston part, at least one tube formed on each fork part of the ring, an expanding screw provided in each tube for bolting the two fork parts of said intermediate ring to the annular ribs, and further screws in a single circular arrangement located in the piston skirt and connected to said base part for bolting the base part of the intermediate ring to the lower part of the piston.
Claim 2
Dependent Claim
167 words
An internal combustion engine piston including a lightweight metal lower part comprising the piston skirt, a piston crown connected with the piston skirt and comprising the upper part of the piston, which piston crown is formed from steel, two concentric integral annular ribs projecting from the inside face of the piston crown, a piston ring zone surrounding the piston crown, a cross-sectionally Y-shaped bifurcated annular intermediate ring of cast iron located between the upper and lower piston part, said ring including fork parts mating with said annular ribs respectively and a base part mating with said lower piston part, at least one tube formed on each fork part of the ring, an expanding screw provided in each tube for bolting the two fork parts of said intermediate ring to the annular ribs, and further screws in a single circular arrangement located in the piston skirt and connected to said base part for bolting the base part of the intermediate ring to the lower part of the piston.
References Cited (Backward Citations)
US2266192A
Cited
US3385175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |