US3772946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash removal
Assignee: KIEKHAEFER AEROMARINE MOTORS
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Filing: 1972-05-04
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Granted: 1973-11-20
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Expires: 1992-05-04
Abstract
Abstract Following die casting of an aluminum alloy cylinder block with an insert liner having openings extending through the liner and block to the outside, the flash across the opening is removed by employing a mandrel in the liner with a passage through the mandrel registering with the liner opening, and inserting a male punch through the opening from the outside to shear the flash around the edge of the opening and break it loose after which it falls out through the passage in the mandrel upon removal of the punch and mandrel.
Inventors
- 👤 S Sarra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/02; F02F1/04; B; B22; B22D; B22D31/00; Y; Y10; Y10S; Y10S83/00; Y10S83/914; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/4927; Y10T29/49272; Y10T29/49826; Y10T29/49861; Y10T83/00; Y10T83/04; Y10T83/384; Y10T83/395
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
The method of removing flash from port openings in a die cast cylinder block having an insert cylinder liner, comprising supporting the block upon a mandrel substantially fitting within the cylinder liner, forcing a punch axially into the port opening and through the interface between the liner and the die cast material to loosen the flash at its root, and thereafter retracting the punch and removing the cylinder block from the mandrel whereby the loosened flash falls away.
Claim 2
Independent Claim
78 words
The method of removing flash from port openings in a die cast cylinder block having an insert cylinder liner, comprising supporting the block upon a mandrel substantially fitting within the cylinder liner, forcing a punch axially into the port opening and through the interface between the liner and the die cast material to loosen the flash at its root, and thereafter retracting the punch and removing the cylinder block from the mandrel whereby the loosened flash falls away.
Claim 3
Dependent Claim
36 words
The method of claim 1 and employing the punch to force the severed flash into an enlarged passage through the mandrel to facilitate release of the flash upon removal of the cylinder block from the mandrel.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |