US3818971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for casting blocks
Assignee: Individual
•
Filing: 1972-04-14
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Granted: 1974-06-25
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Expires: 1992-04-14
Abstract
Abstract A tiltable furnace to supply molten metal to a ladle and the ladle is connected to a computing and automatic control system which continuously senses the rate of change of weight of the ladle as liquid is poured from the ladle into a mold. The control system tilts the furnace and the ladle to regulate the flow of liquid into the mold to hold the casting to a predetermined weight. The rate of change of the weight of liquid times the time of the pour will give the weight poured in that time.
Inventors
- 👤 E Schutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:14
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/04; B22D25/00; B22D25/02; B22D25/04; B22D5/00; B22D5/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
In the method for automatically controlling the desired weight of cast blocks or plates particularly composed of metal comprising the steps of continuously sensing the differential quotient of the change in weight of the ladle used in the casting cycle, and controlling the pouring of liquid from the ladle into a mold by use of said differential quotient in a computing and control system, the improvement in which the differential quotient of the change in weight of the ladle per time unit due to the flow of liquid from a supply furnace into the ladle during the intervals between two pouring periods of the ladle is stored as a function in the memory of the computing and control system, and then using said stored function during the pouring period of the ladle as an integrated value together with the integrated value derived from the measured change in weight of the ladle during said pouring period for determining the actual weight of liquid which is poured from the ladle and for obtaining the desired weight of the blocks or plates.
Claim 2
Dependent Claim
179 words
In the method for automatically controlling the desired weight of cast blocks or plates particularly composed of metal comprising the steps of continuously sensing the differential quotient of the change in weight of the ladle used in the casting cycle, and controlling the pouring of liquid from the ladle into a mold by use of said differential quotient in a computing and control system, the improvement in which the differential quotient of the change in weight of the ladle per time unit due to the flow of liquid from a supply furnace into the ladle during the intervals between two pouring periods of the ladle is stored as a function in the memory of the computing and control system, and then using said stored function during the pouring period of the ladle as an integrated value together with the integrated value derived from the measured change in weight of the ladle during said pouring period for determining the actual weight of liquid which is poured from the ladle and for obtaining the desired weight of the blocks or plates.
Claim 3
Dependent Claim
39 words
In a method as in claim 1, further comprising measuring the beginning and ending of the pouring time by an indicator positioned adjacent pouring lip of the ladle, and sending said time into the computing and automatic control system.
Claim 4
Dependent Claim
27 words
In a method as in claim 2, further comprising adjusting the inclination of the ladle by said control system to obtain the desired weight of poured metal.
Claim 5
Dependent Claim
27 words
In a method as in claim 3, further comprising initially inclining said ladle in accordance with its weight to begin pouring liquid from said ladle without delay.
Claim 6
Dependent Claim
23 words
In a method as in claim 4, further comprising pouring from said ladle in accordance with a function having an adjustable time base.
Claim 7
Dependent Claim
36 words
In a method as in claim 5, further comprising comparing the gross weight of the ladle at a given time with the gross weight of the ladle at the corresponding time during thE preceding casting cycle.
Claim 8
Dependent Claim
38 words
In a method as in claim 6, further comprising sending the difference in weight at said given time into the computing and automatic control system for changing the flow of liquid from a supply furnace into said ladle.
Claim 9
Dependent Claim
26 words
In a method as in claim 7, further comprising using the difference in weight at said given time as a control signal for casting starting blanks.
References Cited (Backward Citations)
CA556385A
Cited
DE1045054B
Cited
DE1064206B
Cited
DE1231855B
Cited
DE1217558B
Cited
DE1300207B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |