US3596703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing core shift in casting articles
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1968-10-01
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Granted: 1971-08-03
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Expires: 1988-10-01
Abstract
Abstract Shell-type casting molds for producing hollow cast articles, the mold being built up by forming a low melting pattern about a ceramic core, inserting thin metal pins through the pattern and into engagement with the core, forming a shell mold about the resulting pattern so that the ends of the pins are anchored in the resulting shell mold, removing the meltable pattern, and casting the molten metal into the cavity thus produced whereby the molten metal dissolves the pins and no holes appear in the finished article.
Inventors
- 👤 Thomas H Bishop
- 👤 Kenneth K Young Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
B; B22; B22C; B22C21/00; B22C21/12; B22C21/14; B22C9/00; B22C9/02; B22C9/04; B22C9/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49337
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
The method of making a hollow casting which comprises forming a low melting pattern about a ceramic core, inserting metal wires through the resulting pattern into engagement with said ceramic core while leaving exposed end portions on said wires, forming a ceramic shell mold about said pattern thereby anchoring said exposed end portions therein, melting out said pattern to leave said metal wires providing lateral support for said core, casting molten metal into the casting cavity provided by melting out said pattern to thereby melt out the portions of the wires extending through said casting cavity, and removing the ceramic core from the casting.
Claim 2
Independent Claim
104 words
The method of making a hollow casting which comprises forming a low melting pattern about a ceramic core, inserting metal wires through the resulting pattern into engagement with said ceramic core while leaving exposed end portions on said wires, forming a ceramic shell mold about said pattern thereby anchoring said exposed end portions therein, melting out said pattern to leave said metal wires providing lateral support for said core, casting molten metal into the casting cavity provided by melting out said pattern to thereby melt out the portions of the wires extending through said casting cavity, and removing the ceramic core from the casting.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which said wires are composed of the same metal as said molten metal.
Claim 4
Dependent Claim
16 words
The method of claim 1 in which said wires are inserted through said pattern while hot.
Claim 5
Dependent Claim
17 words
The method of claim 1 in which said wires are less than about 0.050 inch in diameter.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |