US3779833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for retreading tires
Assignee: Oliver Tire and Rubber Co
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Filing: 1972-04-25
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Granted: 1973-12-18
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Expires: 1992-04-25
Abstract
Abstract The specification discloses an apparatus for retreading a tire casing with a precured and premolded tire tread. The apparatus includes a flexible envelope which surrounds the tire and precured tread assembly from sidewall to sidewall to form with the walls of a multipart chamber device a fluid tight annular chamber surrounding the tread portion of the assembly. The apparatus includes means for inflating the interior of the assembly to laterally distend the sidewalls of the casing into engagement with sealing means mounted on the inner walls of the multipart chamber device.
Inventors
- 👤 W Reppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D30/56; B29D30/542; B29D2030/545; Y; Y10; Y10S; Y10S156/00; Y10S156/909
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
252 words
Apparatus for retreading tires comprising: a. a treadless, two-part torroidal mold having a generally U-shaped cross-section, said mold having a fluid inlet and a fluid exhaust means, said fluid inlet means being disposed tangentially within said mold to direct said fluid tangentially of said tire in a swirling circular manner, b. a thin flexible envelope mounted within said mold for covering a tire assembly prepared for retreading from sidewall to sidewall around its outer perimeter; c. sealing means for sealing each side of said flexible envelope to said torroidal mold along the sidewall of a tire assembly prepared for retreading to thereby create an annular chamber between said liner and said mold, said sealing means defining two annular members interfitted with said two part torroidal mold, one of said members being interfitted on each side of said tire; d. curing bag means for mounting within said tire assembly, said curing bag means defining at least one inlet means for inflating the interior of said tire assembly to a pressure equal to or greater than the pressure in said annular chamber, said curing bag contacting the inner surface of said tire assembly from a point on the inner sidewall opposite one of said sealing means to a point on the other side of said inner sidewall opposite the other of said sealing means, said curing bag also defining a lateral member extending laterally within said tire from a point opposite one of said sealing means to a point opposite said other sealing means.
Claim 2
Dependent Claim
41 words
Tire retreading apparatus as claimed in claim 2 wherein said sealing means further comprise an annular support member, and an annular spacing portion to space the sealing portion of said gasket means axially from the annular support member of the gasket.
Claim 3
Dependent Claim
28 words
Tire retreading apparatus as claimed in claim 2 which further comprises an air bleeding means mounted between said thin flexible envelope and said tire assembly prepared fro retreading.
Claim 4
Dependent Claim
42 words
Apparatus for retreading tires as claimed in claim 1 wherein said inflatable means defines a curing bag means with at least one fluid inlet means for inflating said curing bag means to a pressure greater than the pressure in said annular chamber.
Claim 5
Dependent Claim
51 words
Apparatus for retreading tires as claimed in claim 1 wherein said inflatable means comprises a rigid rim for supporting the tire and an inner tube inside the tire and around the rim with an inlet means for inflating said tube to a pressure greater than the pressure in said annular chamber.
Claim 6
Dependent Claim
30 words
Apparatus for retreading tires as claimed in claim 1 wherein said means for sealing the flexible envelope comprises annular sealing means mounted on the inner sidewalls of said annular mold.
Claim 7
Dependent Claim
62 words
Apparatus for retreading tires as claimed in claim 5 wherein said curing bag means provides support for the inner surface of said tire assembly from a point radially aligned with or radially inwardly from said sealing means on one inner sidewall of said mold to a point on the other inner sidewall of said mold opposite the other of said sealing means.
Claim 8
Dependent Claim
27 words
Apparatus for retreading tires as claimed in claim 9 wherein said sealing means comprises annular undulations which extend inwardly to contact the tire assembly prepared for retreading.
Claim 9
Dependent Claim
60 words
Apparatus for retreading tires as claimed in claim 8 wherein said means for inflating the interior of said tire assembly further comprises a lateral means to support said curing bag means, said lateral means extending laterally within said tire from a point opposite or radially inwardly of one of said sealing means to a point opposite said other sealing means.
Claim 10
Dependent Claim
39 words
Apparatus for retreading tires as claimed in claim 1 wherein said multi-part mold defines first and second sidewalls and first and second annular connecting members, said connecting members joining together midway between said sidewalls to form said annular mold.
Claim 11
Dependent Claim
30 words
Apparatus for retreading tires as claimed in claim 1 wherein said sealing means comprise at least one annular ridge which extends inwardly to contact the tire assembly prepared for retreading.
Claim 12
Dependent Claim
223 words
Apparatus for retreading tires with a precured premolded tread strip comprising a. a treadless, two part rigid toroidal enclosure having a generally U-shaped cross section and defining a generally annular sealed chamber around the tread of the assembly, b. a thin flexible envelope adapted to cover said assembly from sidewall to sidewall around its outer perimeter, c. sealing means defined on the inner wall of said enclosure adjacent each of said assembly sidewalls, said sealing means defining at least one annular ridge adjacent each of said sidewalls for providing a seal between the flexible enVelope and the enclosure at the sidewalls of the assembly, said ridges, and the inner walls of said enclosure cooperating with the exterior surface of said envelope to provide a fluid tight annular chamber around the tread of the assembly, d. fluid inlet and exhaust means for admitting pressurized and heated fluid into said annular chamber defined between said enclosure and said envelope, e. inflatable means mounted within said assembly for inflation to a pressure greater than the pressure in said annular chamber, said means laterally distending the sidewalls of said assembly to urge them into contact with said sealing ridges, f. means mounted between said assembly and said envelope for evacuating air trapped between the surface of the tire assembly prepared for retreading and said thin flexible envelope.
Claim 13
Dependent Claim
52 words
Apparatus for retreading tires as claimed in claim 13 wherein said inflatable means comprises a rigid rim for supporting said tire assembly and an inner tube within said assembly, said tube having an inlet means to provide inflation of said tube to a pressure greater than the pressure in said annular chamber.
Claim 14
Dependent Claim
41 words
Apparatus for retreading tires as claimed in claim 13 wherein said inflatable means comprises a curing bag means with at least one fluid inlet for inflating said curing bag means to a pressure greater than the pressure in said annular chamber.
Claim 15
Dependent Claim
28 words
Apparatus for retreading tires as claimed in claim 13 wherein said sealing means also comprises axial spacing means for laterally adjusting the ridges defined on said sealing means.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |