US3712099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming ring grooves and piston lands on a steel piston, especially for internal combustion engines
Assignee: ANGSBURG NUERNBERG AG WERK NUE
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Filing: 1971-02-18
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Granted: 1973-01-23
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Expires: 1991-02-18
Abstract
Abstract A method of and apparatus for providing steel pistons with annular grooves, according to which the annular grooves are made by roll-forming the material of the piston head.
Inventors
- 👤 G Elsbett
- 👤 L Elsbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:00
CPC Classifications
F; F16; F16J; F16J9/00; B; B21; B21H; B21H7/00; B21H7/18; B21H7/182; B21K; B21K1/00; B21K1/18; B23; B23B; B23B5/00; B23P; B23P15/00; B23P15/10; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49265
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
An apparatus for roll forming groove and land areas in heads of steel pistons for internal combustion engines, especially diesel engines, which comprises: first roll means having an axial dimension at the periphery corresponding to the axial dimension of a ring groove to be formed thereby and adapted to be pressed into the periphery of a steel piston head during rotation of the piston head and roll means to form a ring groove in the piston head, and second roll means adapted to engage the periphery of the said piston head for forming the land areas thereon disposed on opposite axial sides of said groove.
Claim 2
Independent Claim
105 words
An apparatus for roll forming groove and land areas in heads of steel pistons for internal combustion engines, especially diesel engines, which comprises: first roll means having an axial dimension at the periphery corresponding to the axial dimension of a ring groove to be formed thereby and adapted to be pressed into the periphery of a steel piston head during rotation of the piston head and roll means to form a ring groove in the piston head, and second roll means adapted to engage the periphery of the said piston head for forming the land areas thereon disposed on opposite axial sides of said groove.
Claim 3
Dependent Claim
35 words
AN apparatus according to claim 1 in which first roll means comprises a plurality of rolls in axially spaced relation operable to form a plurality of axially related ring grooves in said piston head simultaneously.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 1 in which said first roll means comprises at least one radially extending circumferential projection.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 1 in which said first roll means comprise a plurality of rolls distributed circumferentially about the piston head.
Claim 6
Dependent Claim
40 words
An apparatus according to claim 1 in which said first roll means comprise a plurality of sets of rolls distributed circumferentially about the piston head, each set of rolls comprising a plurality of rolls distributed axially of said piston head.
Claim 7
Dependent Claim
37 words
An apparatus according to claim 5 in which said second roll means comprises land forming rolls interposed between said sets of rolls and adapted to be applied to said piston head simultaneously with said sets of rolls.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |