US4491168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resistant insert for cast lightweighted pistons and method of casting
Assignee: JPI Transportation Products Inc
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Filing: 1983-05-26
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Granted: 1985-01-01
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Expires: 2003-05-26
Abstract
Abstract The wear resistant insert is an annular ring of austenitic iron alloy. It has a peripheral surface which conforms to the exterior of the piston into which it is to be cast. A plurality of frangible tabs project outward from the periphery. When casting a piston, the insert is supported on a ledge in a die cavity. A predetermined amount of aluminum alloy is poured into the die cavity and the cavity is closed by a punch. The punch applies a force on the solidifying alloy. As the aluminum alloy shrinks during solidification, the pressure severs the frangible tabs allowing the insert to shift.
Inventors
- 👤 David J. Snee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:49
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/0009; B22D19/0027; B22D27/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A method of casting in a die cavity a lightweight piston with a wear resistant insert, the wear resistant insert including an annular ring having a peripheral edge and at least one frangible projection extending from the peripheral edge, the die cavity having an outer die surface, an opening, and means for supporting the annular ring in the die cavity, the method comprising: disposing the annular ring in the die cavity with its frangible projection supported by the supporting means, pouring a predetermined amount of molten lightweight alloy into the die cavity; closing the die cavity opening with a punch extending into the die cavity; applying on the lightweight alloy a force with the punch which is sufficient to break the frangible projection, whereby as the lightweight alloy shrinks during solidification the projection breaks off allowing the annular ring to move.
Claim 2
Independent Claim
141 words
A method of casting in a die cavity a lightweight piston with a wear resistant insert, the wear resistant insert including an annular ring having a peripheral edge and at least one frangible projection extending from the peripheral edge, the die cavity having an outer die surface, an opening, and means for supporting the annular ring in the die cavity, the method comprising: disposing the annular ring in the die cavity with its frangible projection supported by the supporting means, pouring a predetermined amount of molten lightweight alloy into the die cavity; closing the die cavity opening with a punch extending into the die cavity; applying on the lightweight alloy a force with the punch which is sufficient to break the frangible projection, whereby as the lightweight alloy shrinks during solidification the projection breaks off allowing the annular ring to move.
Claim 3
Dependent Claim
28 words
The method as set forth in claim 1 wherein the at least one frangible projection includes a plurality of frangible tabs which are supported by the supporting means.
Claim 4
Dependent Claim
16 words
The method as set forth in claim 1 wherein the frangible projection is a peripheral flange.
References Cited (Backward Citations)
US3533329A
Cited
US4120081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |