Patent US3840971A successfully refreshed from Google Patents.
US3840971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a sand mold for casting tread rings utilized in tire molds
Assignee: Goodyear Tire and Rubber Co
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Filing: 1971-12-30
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Granted: 1974-10-15
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Expires: 1991-12-30
Abstract
Abstract A method of making a sand mold for casting tread rings utilized in tire molds in which molding sand is poured over a flexible pattern to form a mold portion in a general shape of a truncated sector. The mold portion is removed from the flexible pattern before the sand is completely hardened and is then shaved and fitted to other similarly shaped segments as required to form a complete circular sand mold.
Inventors
- 👤 E Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:15
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/22; B22C9/28; B22C11/00; B22C7/00; B22C7/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method of making a sand mold for casting a ring-like metal object comprising pouring sand and binder mix in a pattern to form a truncated sector, leaving said truncated sector in said pattern until said sector is hardened sufficiently to permit removal of said sector from said pattern without damaging said sector, removing said sector from said pattern at a predetermined time before said sand and binder mix is completely hardened, then trimming at least one side of said sector and fitting said sector with a plurality of similarly shaped sectors to form a circular mold, and making a plurality of said sectors in timed sequential steps to permit trimming of said sectors before they become completely hardened.
Claim 2
Independent Claim
119 words
A method of making a sand mold for casting a ring-like metal object comprising pouring sand and binder mix in a pattern to form a truncated sector, leaving said truncated sector in said pattern until said sector is hardened sufficiently to permit removal of said sector from said pattern without damaging said sector, removing said sector from said pattern at a predetermined time before said sand and binder mix is completely hardened, then trimming at least one side of said sector and fitting said sector with a plurality of similarly shaped sectors to form a circular mold, and making a plurality of said sectors in timed sequential steps to permit trimming of said sectors before they become completely hardened.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 1, wherein said sand and binder mix are poured over a flexible pattern to permit removal of said sector from said pattern before said sand and binder mix are completely hardened without damaging said section.
Claim 4
Dependent Claim
28 words
A method as claimed in claim 2 further including placing a cope half over said circular mold to form a ring-like cavity therewith for forming a metal ring.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1, in which a template is placed adjacent said sector in a predetermined position to determine the extent to which said side is to be trimmed.
Claim 6
Dependent Claim
35 words
A method as claimed in claim 4, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 45* and 120* F. while said sector is on said pattern.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 4, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 60* and 90* F. while said sector is on said pattern.
Claim 8
Dependent Claim
35 words
A method as claimEd in claim 3, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 60* and 90* F. while said sector is on said pattern.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |