US4415015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of compacting moulding sand
Assignee: GEORGE FISCHER Ltd A CORP OF SWITZERLAND
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Filing: 1980-01-24
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Granted: 1983-11-15
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Expires: 2000-01-24
Abstract
Abstract A process for compacting moulding sand to form a casting mould comprises the steps of filling a moulding space located between a pattern plate and a pressure plate with moulding sand, pre-compacting the moulding sand, after the moulding space is filled with moulding sand and closed by the pressure plate, by an explosive-type shock pressure, and subsequently re-compacting the moulding sand by mechanically pressing the moulding sand between the pattern plate and the pressure plate.
Inventors
- 👤 Lumir Zadera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:22
CPC Classifications
B; B22; B22C; B22C15/00; B22C15/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A process for compacting moulding sand to form a casting mould, comprising the steps of: filling a moulding space located between a pattern plate and a pressure plate with moulding sand; pre-compacting the moulding sand, after the moulding space is filled with moulding sand and closed by the pressure plate, by an explosive-type shock pressure; and subsequently re-compacting the moulding sand by mechanically pressing the moulding sand between the pattern plate and the pressure plate.
Claim 2
Dependent Claim
75 words
A process for compacting moulding sand to form a casting mould, comprising the steps of: filling a moulding space located between a pattern plate and a pressure plate with moulding sand; pre-compacting the moulding sand, after the moulding space is filled with moulding sand and closed by the pressure plate, by an explosive-type shock pressure; and subsequently re-compacting the moulding sand by mechanically pressing the moulding sand between the pattern plate and the pressure plate.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein said shock pressure is produced by combustion fuel by detonation or explosion.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein said shock pressure is produced by expanding a highly pressurized vapor.
Claim 5
Dependent Claim
18 words
A process according to claim 1 wherein said shock pressure is produced by expanding a highly pressurized gas.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the moulding space is filled with a dosed amount of moulding sand only under the force of gravity.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |