US3635280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-aligned multipart combustible casting pattern and method of making same
Assignee: HIGH PERFORMANCE MACHINE Inc A CORP OF MI
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Filing: 1969-11-07
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Granted: 1972-01-18
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Expires: 1989-11-07
Abstract
Abstract Combustible patterns of expanded polystyrene, carved to complex forms by the tape-controlled milling of two or more self-aligning parts, resist displacement from each other as sand is packed within and around them. Tongue-and-groove joints, formed on the mating surfaces of the parts, locate and align the parts and prevent their displacement more surely than adhesives, which tend to cause inclusions and voids in the casting. Adhesive may be coated on the tongue-and-groove parts only, leaving adjacent margins of the mating surfaces free from adhesive; and the exterior surfaces of the assembled pattern may be coated with a noncombustible ceramic coating. The marginal spacing of the adhesive inward from such coating permits quick dispersion of the adhesive when the molten metal is cast.
Inventors
- 👤 John T Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/005; B22C7/02; B22C7/023; B22C7/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A self-aligned multipart combustible pattern for foundry use, comprising a plurality of pattern parts formed of material of a type which is combustible under a charge of molten metal, said plurality of parts having mating surfaces and being formed to shapes which, when assembled at such mating surfaces, make up a desired pattern form having shaped exterior surfaces, at least one of said plurality of parts having opposed wall surfaces terminating in one of said mating surfaces, tongue-and-groove means formed on the said mating surfaces and spaced inward of the opposed wall surfaces of said one part, whereby to provide marginal mating surface portions therebetween, an adhesive coating joining the tongue-and-groove means, the said marginal mating surface portions being free of said adhesive coating, and a noncombustible coating on said exterior surfaces and covering the junctures thereat of said marginal mating surface portions, whereby the spacing of the said adhesive coating from the noncombustible coating avoids retention of the adhesive when the assembled pattern is subjected to a charge of molten metal.
Claim 2
Dependent Claim
172 words
A self-aligned multipart combustible pattern for foundry use, comprising a plurality of pattern parts formed of material of a type which is combustible under a charge of molten metal, said plurality of parts having mating surfaces and being formed to shapes which, when assembled at such mating surfaces, make up a desired pattern form having shaped exterior surfaces, at least one of said plurality of parts having opposed wall surfaces terminating in one of said mating surfaces, tongue-and-groove means formed on the said mating surfaces and spaced inward of the opposed wall surfaces of said one part, whereby to provide marginal mating surface portions therebetween, an adhesive coating joining the tongue-and-groove means, the said marginal mating surface portions being free of said adhesive coating, and a noncombustible coating on said exterior surfaces and covering the junctures thereat of said marginal mating surface portions, whereby the spacing of the said adhesive coating from the noncombustible coating avoids retention of the adhesive when the assembled pattern is subjected to a charge of molten metal.
Claim 3
Dependent Claim
38 words
A self-aligned multipart combustible pattern as defined in claim 1, wherein the tongue-and-groove means is formed to negative tolerances, whereby to provide space for the flow of adhesive and thereby maintain the said marginal portions free of adhesive.
Claim 4
Dependent Claim
49 words
A self-aligned multipart combustible pattern as defined in claim 1, wherein the material from which the pattern parts are formed consists of self-adhered beads of expanded polystyrene, and in which the marginal portions of the mating surfaces have a width at least three times the diameter of such beads.
Claim 5
Independent Claim
149 words
The method of making a multipart self-aligned combustible pattern for foundry use, comprising the steps of forming from expanded plastic material, of a type which is combustible under a charge of molten metal, a plurality of pattern parts having mating surfaces and being so shaped as, when assembled, will make up the desired pattern form, while so forming the parts, forming on their said mating surfaces tongue-and-groove interfitting portions leaving marginal portions of the mating surfaces thereadjacent, coating an adhesive on said interfitting portions only, superposing the plurality of parts upon each other whereby the interfitting portions locate and align the parts in the desired form and the marginal portions abut each other without any adhesive therebetween, and coating the exterior surfaces of the assembled pattern parts with a noncombustible coating, whereby the marginal portions establish a spacing between the adhesive on the interfitting portions and the noncombustible coating.
Claim 6
Independent Claim
149 words
The method of making a multipart self-aligned combustible pattern for foundry use, comprising the steps of forming from expanded plastic material, of a type which is combustible under a charge of molten metal, a plurality of pattern parts having mating surfaces and being so shaped as, when assembled, will make up the desired pattern form, while so forming the parts, forming on their said mating surfaces tongue-and-groove interfitting portions leaving marginal portions of the mating surfaces thereadjacent, coating an adhesive on said interfitting portions only, superposing the plurality of parts upon each other whereby the interfitting portions locate and align the parts in the desired form and the marginal portions abut each other without any adhesive therebetween, and coating the exterior surfaces of the assembled pattern parts with a noncombustible coating, whereby the marginal portions establish a spacing between the adhesive on the interfitting portions and the noncombustible coating.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |