Patent US5808697A successfully refreshed from Google Patents.
US3845895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cracking castings
Assignee: Nagoya Metal Co Ltd
•
Filing: 1974-02-28
•
Granted: 1974-11-05
•
Expires: 1994-02-28
Abstract
Abstract An apparatus for cracking castings characterized in that; a cracking piece is placed between a cracking tool and a crackingtool receiving member; the cracking tool is pressed on a piece to be cracked so as to lodge the point of said tool in said piece; an abrupt temperature rise is caused in a press-and-slide portion on which the cracking tool is pressed, a cooling water is injected in a small gap produced between the cracking tool and the cracked face of said piece, thereby rapidly cooling said press-and-slide portion as well as heat affected zone in said piece, for rendering same embrittled; whereby both the physical and chemical actions are concurrently caused.
Inventors
- 👤 Y Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:12
CPC Classifications
B; B23; B23D; B23D31/00; B23D31/002; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/304; Y10T225/371
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
An apparatus for cracking castings characterized in that; a piece to be cracked, placed on a crackingtool receiving member fixedly mounted on a bedplate is given a pressure progressively by a cracking tool, said cracking tool being located above said piece and adapted to be vertically moved by means of hydraulic pressure so as to lodge its point in said piece by the cooperation of said cracking-tool receiving member; and, when an abrupt temperature rise occurs in a press-and-slide portion on a lodged face in said piece on which portion the cracking tool is slidingly pressed, cooling water is injected on to said pressand-slide portion, with the continuing downward motion of said cracking tool for exerting pressure thereon, whereby physical and chemical actions are concurrently caused, thereby instantaneously producing a cracking force of several times as high as a power possessed by said cracking tool itself.
Claim 2
Independent Claim
146 words
An apparatus for cracking castings characterized in that; a piece to be cracked, placed on a crackingtool receiving member fixedly mounted on a bedplate is given a pressure progressively by a cracking tool, said cracking tool being located above said piece and adapted to be vertically moved by means of hydraulic pressure so as to lodge its point in said piece by the cooperation of said cracking-tool receiving member; and, when an abrupt temperature rise occurs in a press-and-slide portion on a lodged face in said piece on which portion the cracking tool is slidingly pressed, cooling water is injected on to said pressand-slide portion, with the continuing downward motion of said cracking tool for exerting pressure thereon, whereby physical and chemical actions are concurrently caused, thereby instantaneously producing a cracking force of several times as high as a power possessed by said cracking tool itself.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |