Patent US6526462B1 successfully refreshed from Google Patents.
US4559685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a piston for internal combustion engines
Assignee: Aisin Corp
•
Filing: 1984-07-03
•
Granted: 1985-12-24
•
Expires: 2004-07-03
Abstract
Abstract A method of manufacturing a piston for internal combustion engines which utilize a core molding or casting system for forming a hollow chamber for the passage of cooling oil therethrough. The manufacturing method includes the steps of preparing a core so as to have at least a first and second foot portion extending therefrom; inserting a bar member made of magnetic materials within each of the first and second foot portions; positioning at least one permanent magnet on a core box; and fixing the core to the core box via the bar members due to the magnetic flux of the permanent magnet.
Inventors
- 👤 Sohichi Hara
- 👤 Minori Matsuzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:58
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; B22C9/103; B22C21/00; B22C21/12; B22C21/14; F; F02; F02F; F02F3/00; F02F3/0015; F02F3/003; F02F3/16; F02F3/20; F02F3/22; F02F7/00; F02F7/0085; F02F7/0087; F02F2003/0061; Y; Y10; Y10S; Y10S29/00; Y10S29/095; Y10S29/105; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49261; Y10T29/4998; Y10T29/49988; Y10T29/49998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A method of manufacturing a piston for internal combustion engines so as to form a hollow chamber in a piston head of the piston for the passage of cooling oil, which comprises: preparing a core so as to have at least a first and second foot portion extending therefrom; inserting a bar member made of magnetic materials within each of said first and second foot portions; positioning at least one permanent magnet on a core box; and fixing said core to said core box via said bar members due to the magnetic flux of said permanent magnet.
Claim 2
Independent Claim
97 words
A method of manufacturing a piston for internal combustion engines so as to form a hollow chamber in a piston head of the piston for the passage of cooling oil, which comprises: preparing a core so as to have at least a first and second foot portion extending therefrom; inserting a bar member made of magnetic materials within each of said first and second foot portions; positioning at least one permanent magnet on a core box; and fixing said core to said core box via said bar members due to the magnetic flux of said permanent magnet.
Claim 3
Dependent Claim
26 words
A method of manufacturing as set forth in claim 1, wherein said magnetic materials are selected from the group consisting of iron and an iron alloy.
Claim 4
Dependent Claim
19 words
A method of manufacturing as set forth in claim 1, wherein said core further comprises a ceramic material core.
Claim 5
Dependent Claim
38 words
A method of manufacturing as set forth in claim 1, wherein said foot portions further comprise means for forming an inlet and an outlet in said hollow chamber in said piston head for passage of said cooling oil.
Claim 6
Dependent Claim
40 words
A method of manufacturing as set forth in claim 1, further comprising means positioned on said core box for fixing said permanent magnet to said core box, wherein said means for fixing said permanent magnet is made of nonmagnetic materials.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |