Patent US4047558A successfully refreshed from Google Patents.
US4047558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metering device for metal casting machines, particularly low pressure casting machines
Assignee: Honsel Werke AG
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Filing: 1975-06-25
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Granted: 1977-09-13
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Expires: 1995-06-25
Abstract
Abstract A metering device and method for introducing molten metal from a reservoir into a mold, the metering device including a pilot valve, a control valve actuated by the pilot valve, and an analog computer controlling operation of the pilot valve, the computer receiving signals corresponding to the speed of filling of the mold, the magnitude of the pressure up to solidification of the first casting in the mold, and the change in pressure in the reservoir due to decrease in the metal level in the reservoir.
Inventors
- 👤 Winfried Kotthoff
- 👤 Wolfgang Wiedenroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:24
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
In a metal casting machine including a mold, a reservoir connected to the said mold, and gas pressure means connected to said reservoir for delivering molten metal from said reservoir to said mold, a pressure control device comprising a control valve, a pilot valve feeding said control valve with a predetermined gas pressure, and a conduit communicating said control valve with the pressure in said reservoir, said control valve functioning as a differential pressure valve to apply the difference in pressures across said control valve as a control for said gas pressure means.
Claim 2
Dependent Claim
93 words
In a metal casting machine including a mold, a reservoir connected to the said mold, and gas pressure means connected to said reservoir for delivering molten metal from said reservoir to said mold, a pressure control device comprising a control valve, a pilot valve feeding said control valve with a predetermined gas pressure, and a conduit communicating said control valve with the pressure in said reservoir, said control valve functioning as a differential pressure valve to apply the difference in pressures across said control valve as a control for said gas pressure means.
Claim 3
Dependent Claim
21 words
A casting machine according to claim 1 in which said pilot valve is a servo valve electrically controllable by a computer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |