US3884740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of retreading tires
Assignee: Bridgestone Bandag LLC
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Filing: 1973-09-20
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Granted: 1975-05-20
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Expires: 1993-09-20
Abstract
Abstract An assembly is formed from a tire carcass having a U-shaped cross-section, a tread strip on the peripheral surface of this carcass and a layer of binder material sandwiched between the surface and the tread strip. The thus formed assembly is then surrounded over the entire circumference of the carcass with a flexible annular envelope having marginal portions defining with the assembly at least one gap which communicates with the interior of the envelope. This gap is then sealed by interposing in it, under pressure, between the assembly and at least one of the marginal portions, an annular elastic cord of foam rubber or the like.
Inventors
- 👤 Wilhelm Schelkmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:26
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D30/542; Y; Y10; Y10S; Y10S156/00; Y10S156/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
220 words
In a method of retreading tires, the steps of forming an assembly from a tire carcass having a U-shaped cross-section, a profiled tread strip on the peripheral surface of said carcass, and a layer of binder material sandwiched between said surface and said tread strip; stretching an elastic annular cord onto the radially outermost peripheral portion of the profiled tread strip so that it presses radially inwardly against the profiled tread strip; surrounding the thusly formed assembly over the entire circumference of said carcass with a flexible annular envelope not permanently connected to said annular cord and comprised of a first and a second marginal portion defining together with said assembly at least one gap communicating with the interior of the envelope; and sealing said gap by stretching said first marginal portion over said annular cord to such an extent that said first marginal portion stays in place stretched over said annular elastic cord by virtue of the tension in the thusly stretched first marginal portion, and then stretching said second marginal portion over said annular cord and over said first marginal portion to such an extent that said second marginal portion afterwards stays in place stretched over said annular elastic cord and over said first marginal portion by virtue of the tension in the thusly stretched second marginal portion.
Claim 2
Dependent Claim
220 words
In a method of retreading tires, the steps of forming an assembly from a tire carcass having a U-shaped cross-section, a profiled tread strip on the peripheral surface of said carcass, and a layer of binder material sandwiched between said surface and said tread strip; stretching an elastic annular cord onto the radially outermost peripheral portion of the profiled tread strip so that it presses radially inwardly against the profiled tread strip; surrounding the thusly formed assembly over the entire circumference of said carcass with a flexible annular envelope not permanently connected to said annular cord and comprised of a first and a second marginal portion defining together with said assembly at least one gap communicating with the interior of the envelope; and sealing said gap by stretching said first marginal portion over said annular cord to such an extent that said first marginal portion stays in place stretched over said annular elastic cord by virtue of the tension in the thusly stretched first marginal portion, and then stretching said second marginal portion over said annular cord and over said first marginal portion to such an extent that said second marginal portion afterwards stays in place stretched over said annular elastic cord and over said first marginal portion by virtue of the tension in the thusly stretched second marginal portion.
Claim 3
Dependent Claim
86 words
In a method as defined in claim 1, wherein said carcass has two annular beads, and wherein said envelope has two additional marginal portions each defining with a respective one of said beads a respective additional gap; and further including the step of sealing off said additional gaps by interposing an annular elastic cord between one of said beads and one of said additional marginal portions and a further annular elastic cord between the other of said beads and the other of said additional marginal portions.
Claim 4
Dependent Claim
64 words
In a method as defined in claim 1; and further including the step of placing an elastic band permanently connected to neither said marginal portions nor to said annular cord coaxially around the overlapping first and second marginal portionS and accordingly around said annular cord, so as to exert a supplemental force holding said stretched marginal portions in place stretched over said annular cord.
Claim 5
Dependent Claim
28 words
In a method as defined in claim 1, wherein the step of sealing comprises utilizing a cord made from a material having the same specific gravity as water.
Claim 6
Dependent Claim
15 words
In a method as defined in claim 1, wherein said envelope is of one piece.
Claim 7
Dependent Claim
184 words
In a method of retreading tires, the steps of forming an assembly from a tire carcass having a U-shaped cross-section, a profiled tread strip on the peripheral surface of said carcass, and a layer of binder material sandwiched between said surface and said tread strip; surrounding the thusly formed assembly over the entire circumference of said carcass with a flexible annular envelope comprised of membrane material and having marginal envelope membrane portions which define with said assembly at least one gap communicating with the interior of the envelope; and sealing said gap by interposing in it, between said assembly and at least one of said marginal portions, an annular elastic cord which is in sealing engagement with said assembly and with said one marginal portion but not permanently connected to said one marginal portion, said step of sealing comprising stretching said one marginal envelope membrane portion over said annular cord to such an extent that said one marginal envelope membrane portion afterwards stays in place stretched over said annular elastic cord by virtue of the tension in the thusly stretched marginal envelope membrane portion.
Claim 8
Dependent Claim
184 words
In a method of retreading tires, the steps of forming an assembly from a tire carcass having a U-shaped cross-section, a profiled tread strip on the peripheral surface of said carcass, and a layer of binder material sandwiched between said surface and said tread strip; surrounding the thusly formed assembly over the entire circumference of said carcass with a flexible annular envelope comprised of membrane material and having marginal envelope membrane portions which define with said assembly at least one gap communicating with the interior of the envelope; and sealing said gap by interposing in it, between said assembly and at least one of said marginal portions, an annular elastic cord which is in sealing engagement with said assembly and with said one marginal portion but not permanently connected to said one marginal portion, said step of sealing comprising stretching said one marginal envelope membrane portion over said annular cord to such an extent that said one marginal envelope membrane portion afterwards stays in place stretched over said annular elastic cord by virtue of the tension in the thusly stretched marginal envelope membrane portion.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |