Patent US3970131A successfully refreshed from Google Patents.
US3970131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread for the recapping of tires and method of making the same
Assignee: Bridgestone Bandag LLC
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Filing: 1974-05-24
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Granted: 1976-07-20
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Expires: 1994-05-24
Abstract
Abstract A tread for the recapping of tires is provided with a roughened internal surface simultaneously with the shaping of profile on its external surface in a vulcanizing form. The internal surface can be roughened by placing against the body of raw rubber in the form of a latticework, a plate with regularly or irregularly distributed projections or a composite deforming structure. The internal surface of the prefabricated tread can be sealed from the atmosphere by a foil which is applied to the internal surface directly in the form or subsequent to removal of tread from the form.
Inventors
- 👤 Wilhelm Schelkmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:44
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/08; B29D30/10; B29D30/16; B29D2030/1664; B29D2030/1671; B29D30/58; B29D2030/582; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10135; Y10T152/10171
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
151 words
As a novel article of manufacture, a prefabricated tread for use in tire-recapping methods of the type wherein a bonding layer of unvulcanized rubber is inserted intermediate and pressed between the inner surface of a prefabricated tread and the outer surface of a tire carcass at a temperature high enough to cause the unvulcanized rubber of the bonding layer to flow into intimate contact with said surfaces and become vulcanized to effect permanent bonding of the prefabricated tread to the carcass, the novel prefabricated tread being a molded one-piece structure having a profiled external road-engaging surface and having an internal surface substantially completely covered with a crowded network of molded projections and recesses presenting to the unvulcanized rubber of such a bonding layer a large contact surface and a multitude of cavities into which the unvulcanized rubber of such a bonding layer can flow during the performance of such permanent-bonding method.
Claim 2
Dependent Claim
151 words
As a novel article of manufacture, a prefabricated tread for use in tire-recapping methods of the type wherein a bonding layer of unvulcanized rubber is inserted intermediate and pressed between the inner surface of a prefabricated tread and the outer surface of a tire carcass at a temperature high enough to cause the unvulcanized rubber of the bonding layer to flow into intimate contact with said surfaces and become vulcanized to effect permanent bonding of the prefabricated tread to the carcass, the novel prefabricated tread being a molded one-piece structure having a profiled external road-engaging surface and having an internal surface substantially completely covered with a crowded network of molded projections and recesses presenting to the unvulcanized rubber of such a bonding layer a large contact surface and a multitude of cavities into which the unvulcanized rubber of such a bonding layer can flow during the performance of such permanent-bonding method.
Claim 3
Dependent Claim
35 words
A prefabricated tread as defined in claim 1, wherein said molded projections and recesses of said network of molded projections and recesses are arranged in rows extending transversely to the elongation of the prefabricated tread.
Claim 4
Dependent Claim
36 words
A prefabricated tread as defined in claim 1, wherein said molded projections and recesses of said network of molded projections and recesses are arranged in rows extending generally parallel to the elongation of the prefabricated tread.
Claim 5
Dependent Claim
48 words
A prefabricated tread as defined in claim 1, wherein said molded projections and recesses of said network of molded projections and recesses are arranged in rows extending transversely to the elongation of the prefabricated tread and in columns extending generally parallel to the elongation of the prefabricated tread.
Claim 6
Dependent Claim
38 words
A prefabricated tread as defined in claim 1, wherein said network of molded projections and recesses is comprised of a multitude of molded projections so configurated as to define a multitude of intermediate recesses of undercut cross-sectional configuration.
Claim 7
Dependent Claim
51 words
A prefabricated tread as defined in claim 1, wherein said network of molded projections and recesses is comprised of a multitude of molded projections so configurated as to define a multitude of intermediate recesses having, as considered in direction transverse to the elongation of the prefabricated tread, an undercut cross-sectional configuration.
Claim 8
Dependent Claim
52 words
A prefabricated tread as defined in claim 1, wherein said network of molded projections and recesses is comprised of a multitude of molded projections so configurated as to define a multitude of intermediate recesses having, as considered in direction generally parallel to the elongation of the prefabricated tread, an undercut cross-sectional configuration.
Claim 9
Dependent Claim
16 words
A prefabricated tread as defined in claim 1, wherein said projections are of dovetail-shaped cross-sectional configuration.
Claim 10
Dependent Claim
13 words
A prefabricated tread as defined in claim 1, wherein said projections are hemispherical.
Claim 11
Dependent Claim
13 words
A prefabricated tread as defined in claim 1, wherein said projections are button-shaped.
Claim 12
Dependent Claim
36 words
A prefabricated tread as defined in claim 1, wherein the ratio of that portion of said internal surface provided with said projections to that portion of said internal surface provided with said recesses is approximately one-to-one.
Claim 13
Dependent Claim
16 words
A prefabricated tread as defined in claim 1, wherein said recesses have portions of different depth.
Claim 14
Dependent Claim
16 words
A prefabricated tread as defined in claim 1, wherein said recesses have portions of different length.
Claim 15
Dependent Claim
16 words
A prefabricated tread as defined in claim 1, wherein said recesses have portions of different width.
Claim 16
Dependent Claim
18 words
A prefabricated tread as defined in claim 1, wherein said recesses have portions of different length and width.
Claim 17
Dependent Claim
22 words
A prefabricated tread as defined in claim 1, wherein said crowded network of molded projections and recesses has a generally crepe-like texture.
Claim 18
Dependent Claim
33 words
A prefabricated tread as defined in claim 1, wherein the shapes of said recesses are negative cylinders oriented both transverse to and generally parallel to the direction of elongation of the prefabricated tread.
References Cited (Backward Citations)
US2609026A
Cited
US3779833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |