US3604493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for handling and cooling foundry sand
Assignee: Applied Industrial Materials Corp
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Filing: 1969-07-07
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Granted: 1971-09-14
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Expires: 1989-07-07
Abstract
Abstract The invention disclosed herein relates to a novel method of handling and cooling foundry sand. The method includes the steps of preparing a quantity of the foundry sand, conveying a portion of the sand to a molding machine and forming molds therefrom, casting a metal into the molds, breaking up the molds, and mixing the unused sand with the used sand. Only a portion of the usedunused sand mixture is subsequently mulled, the remainder being retained in a storage tank for subsequent cooling. By using this method, the temperature of the foundry sand can be controlled and the use of costly cooling apparatus can be eliminated.
Inventors
- 👤 Joseph S Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:03
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A process for reducing foundry pollution and for cooling foundry sand comprising mulling a quantity of sand greater than 3 times the weight of the metal to be cast, forming molds from said sand, casting metal in said molds, separating the metal from said molds, adding at least one additive selected from the group consisting of sand, clay and carbon to said sand, cooling the used sand obtained from said molds by adding to it sand at a cooler temperature, whereby the resulting mixture has a temperature of 120* F. or below, separating said mixture of sand into two portions, one portion sufficient to form molds for a succeeding molding operation, and conveying the other portion to a storage tank for use in cooling hot used sand.
Claim 2
Dependent Claim
127 words
A process for reducing foundry pollution and for cooling foundry sand comprising mulling a quantity of sand greater than 3 times the weight of the metal to be cast, forming molds from said sand, casting metal in said molds, separating the metal from said molds, adding at least one additive selected from the group consisting of sand, clay and carbon to said sand, cooling the used sand obtained from said molds by adding to it sand at a cooler temperature, whereby the resulting mixture has a temperature of 120* F. or below, separating said mixture of sand into two portions, one portion sufficient to form molds for a succeeding molding operation, and conveying the other portion to a storage tank for use in cooling hot used sand.
Claim 3
Dependent Claim
180 words
In a foundry process wherein molds are formed on the basis of a sand-to-metal ratio of at least 3 to 1 and wherein a larger quantity of relatively cooler sand is added to the hot sand to cool the hot sand and to reduce foundry pollution, the improvement which comprises, dividing the hot sand and cool sand into two parts after the cool sand has been added to the hot sand, one part being a molding part and the other part to be retained for use in a later cooling step, the amount of said molding part being enough to form a desired number of molds therefrom, each of said molds having a sand-to-metal ratio of at least 3 to 1, mulling only the molding part, retaining the other part for the later cooling of said molding part, forming molds from said molding part, casting metal in said molds, separating the metal from said molds, adding the retained part to said molding part, and returning the mixture of the molding part and the retained part to the aforesaid dividing step.
Claim 4
Dependent Claim
180 words
In a foundry process wherein molds are formed on the basis of a sand-to-metal ratio of at least 3 to 1 and wherein a larger quantity of relatively cooler sand is added to the hot sand to cool the hot sand and to reduce foundry pollution, the improvement which comprises, dividing the hot sand and cool sand into two parts after the cool sand has been added to the hot sand, one part being a molding part and the other part to be retained for use in a later cooling step, the amount of said molding part being enough to form a desired number of molds therefrom, each of said molds having a sand-to-metal ratio of at least 3 to 1, mulling only the molding part, retaining the other part for the later cooling of said molding part, forming molds from said molding part, casting metal in said molds, separating the metal from said molds, adding the retained part to said molding part, and returning the mixture of the molding part and the retained part to the aforesaid dividing step.
Claim 5
Dependent Claim
23 words
The foundry process of claim 2 wherein the amount of retained sand is at least 10 times the weight of the metal cast.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |