Patent US3738418A successfully refreshed from Google Patents.
US3738418A
Expired / Lapsed
US
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Backdraft rubber skin mold pattern
Assignee: Caterpillar Inc
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Filing: 1971-07-26
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Granted: 1973-06-12
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Expires: 1991-07-26
Abstract
Abstract A composite metal and elastomer skin pattern for forming circular sand molds includes a circular metal sleeve which forms the basic mold portion and an elastomer skin or covering bonded thereto which includes the pattern''s backdraft portion whereby the resulting pattern can be removed from a cured sand mold without damage thereto due to the elastic deformations of the pattern''s surfaces and its elastomer backdraft portion.
Inventors
- 👤 G Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:56
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/005; Y; Y10; Y10S; Y10S425/00; Y10S425/058
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
An elastomer skinned pattern for forming circular one-piece molds having a backdraft portion comprising: a rigid sleeve member having a base portion and wall portions tapering from said base portion; an elastomer skin contiguous to said wall portions and said base portion, said elastomer skin having an integral backdraft portion whereby the outer surface of the pattern can elastically deform to prevent damage to a cured mold formed therewith when the pattern is removed; and a sub-base means attached to its base portion, said sub-base means operable to clamp the edges of the elastomer skin between said sub-base means and said base portion of the rigid sleeve member.
Claim 2
Dependent Claim
108 words
An elastomer skinned pattern for forming circular one-piece molds having a backdraft portion comprising: a rigid sleeve member having a base portion and wall portions tapering from said base portion; an elastomer skin contiguous to said wall portions and said base portion, said elastomer skin having an integral backdraft portion whereby the outer surface of the pattern can elastically deform to prevent damage to a cured mold formed therewith when the pattern is removed; and a sub-base means attached to its base portion, said sub-base means operable to clamp the edges of the elastomer skin between said sub-base means and said base portion of the rigid sleeve member.
Claim 3
Dependent Claim
24 words
The pattern defined in claim 1 wherein the elastomer skin, exclusive of the backdraft portion, has a thickness of from 0.010 to 0.050 inch.
Claim 4
Dependent Claim
20 words
The pattern defined in claim 1 wherein the elastomer skin including its integral backdraft portion is formed of silicon rubber.
Claim 5
Dependent Claim
40 words
The pattern defined in claim 1 wherein the diameter of the sub-base means is approximately the same as the diameter of the rigid sleeve member whereby the elastomer skin will extend over the circular outer periphery of said sub-base means.
Claim 6
Dependent Claim
29 words
The pattern defined in claim 1 wherein the rigid sleeve member is a metallic sleeve and the elastomer skin is bonded to its wall portions and said base portion.
Claim 7
Dependent Claim
22 words
The pattern defined in claim 1 wherein both the wall portions of the rigid sleeve member are tapered from its base portion.
Claim 8
Dependent Claim
27 words
The pattern defined in claim 1 wherein the backdraft portion consists of a flange shaped portion of elastomer adjacent to the top of the rigid sleeve member.
Claim 9
Dependent Claim
57 words
The pattern defined in claim 4 including a mold table having an aperture for receiving the sub-base means whereby the elastomer skin on the base portion of the rigid sleeve member seats on the surface of said mold table whereby all surfaces of the pattern projecting into a cured mold cavity formed therewith will be elastomer coated.
References Cited (Backward Citations)
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FR1227020A
Cited
US3090996A
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US3378888A
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Cited
US3552480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |