US3901751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making radial ply tires
Assignee: Goodyear Tire and Rubber Co
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Filing: 1973-04-06
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Granted: 1975-08-26
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Expires: 1993-04-06
Abstract
Abstract A method of making a radial ply pneumatic tire in which the carcass plies are treated with electron radiation at least in the area of the plies destined to lie in the area of the shoulders of the tire. The tire is built according to a normal flat band or one-stage method of building tires, including the application of the belt structure and tread rubber to the cylindrical building form, except that the axial spacing between the bead cores on the building form is forshortened in order to avoid wrinkling of the carcass plies beneath the belt structure during the shaping operation.
Inventors
- 👤 Melvin A Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/08; B29D30/20; B29D30/22; B29D30/0005; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
250 words
A METHOD OF MANUFACTURING A RADIAL PLY PNEUMATIC TIRE COMPRISING: PREPARING A CARCASS PLY OF CORD REINFORCED ELASTOMERIC MATERIAL, TREATING THE PORTIONS OF SAID CARCASS PLY WHICH ARE DESTINED TO BE DISPOSED BENEATH AND BETWEEN THE SHOULDER PORTIONS OF THE TIRE WITH A DOSAGE OF ELECTRON RADIATION EQUAL TO BETWEEN 1 AND 5 MEGARADS EMITTED FROM AN ELECTROM ACCELERATOR AT A VOLTAGE INTENSITY SUCH THAT SUBSTANTIALLY NO ENERGY PASSES THROUGH SAID CARCASS PLY TO INCREASE THE STRUCTRRAL STRENGTH OF THE ELASTOMERIC MATERIAL, WRAPPING THE CARCASS PLY CIRCUMFERENTIALLY ABOUT A CYLINDRICAL TIRE BUILDING FORM: POSITIONING TWO INEXTENSIBLE BEAD CORES ABOUT SAID CARCASS PLY WITH A PREDETERMINED AXIAL SPACING BETWEEN SAID BEAD CORE, TURNING EACH AXIALLY OUTER END OF SAID CARCASS ABOUT AN INEXTENSIBLE ANNULAR BEAD CORE, WHILE THE PLY IS IN A SUBSTANTIALLY CYLINDRICAL CONFIGURATON, WRAPPING AT LEAST ONE BIASED ANGLED CORD REINFORCED BELT PLY ABOUT THE CARCASS PLY, PROVIDING ELASTOMERIC TREAD RUBBER ON SAID CARCASS, AND AFTER THE BELT PLY HAS BEEN APPLIED TO THE CARCASS PLY, SHAPING THE TIRE TO THE FORM OF A TORUS AND HEAT CURING THE TIRE IN A MOLD, SAID PREDETERMINED AXIAL SPACING BEIGN SUFFICIENTLY SMALL SUCH THAT UPON SHAPING OF THE TIRE TO THE FORM OF A TORUS THE CORDS IN THE CARCASS PLIES ARE SUBJECTED TO TENSIONS WHICH EFFECTIVELY RESIST COMPRESSION OF THE CARCASS PLY CORDS BENEATH THE BELT STRUCTURE CAUSED BY THE PANTOGRAPHING OF THE BELT CORDS DURING THE SHAPING OPERATION, THUS PREVENTING WRINKLING OF THE CARCASS PLIES UNDER THE BELT STRUCTURE.
Claim 2
Independent Claim
250 words
A METHOD OF MANUFACTURING A RADIAL PLY PNEUMATIC TIRE COMPRISING: PREPARING A CARCASS PLY OF CORD REINFORCED ELASTOMERIC MATERIAL, TREATING THE PORTIONS OF SAID CARCASS PLY WHICH ARE DESTINED TO BE DISPOSED BENEATH AND BETWEEN THE SHOULDER PORTIONS OF THE TIRE WITH A DOSAGE OF ELECTRON RADIATION EQUAL TO BETWEEN 1 AND 5 MEGARADS EMITTED FROM AN ELECTROM ACCELERATOR AT A VOLTAGE INTENSITY SUCH THAT SUBSTANTIALLY NO ENERGY PASSES THROUGH SAID CARCASS PLY TO INCREASE THE STRUCTRRAL STRENGTH OF THE ELASTOMERIC MATERIAL, WRAPPING THE CARCASS PLY CIRCUMFERENTIALLY ABOUT A CYLINDRICAL TIRE BUILDING FORM: POSITIONING TWO INEXTENSIBLE BEAD CORES ABOUT SAID CARCASS PLY WITH A PREDETERMINED AXIAL SPACING BETWEEN SAID BEAD CORE, TURNING EACH AXIALLY OUTER END OF SAID CARCASS ABOUT AN INEXTENSIBLE ANNULAR BEAD CORE, WHILE THE PLY IS IN A SUBSTANTIALLY CYLINDRICAL CONFIGURATON, WRAPPING AT LEAST ONE BIASED ANGLED CORD REINFORCED BELT PLY ABOUT THE CARCASS PLY, PROVIDING ELASTOMERIC TREAD RUBBER ON SAID CARCASS, AND AFTER THE BELT PLY HAS BEEN APPLIED TO THE CARCASS PLY, SHAPING THE TIRE TO THE FORM OF A TORUS AND HEAT CURING THE TIRE IN A MOLD, SAID PREDETERMINED AXIAL SPACING BEIGN SUFFICIENTLY SMALL SUCH THAT UPON SHAPING OF THE TIRE TO THE FORM OF A TORUS THE CORDS IN THE CARCASS PLIES ARE SUBJECTED TO TENSIONS WHICH EFFECTIVELY RESIST COMPRESSION OF THE CARCASS PLY CORDS BENEATH THE BELT STRUCTURE CAUSED BY THE PANTOGRAPHING OF THE BELT CORDS DURING THE SHAPING OPERATION, THUS PREVENTING WRINKLING OF THE CARCASS PLIES UNDER THE BELT STRUCTURE.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1 wherein said carcass ply is treated with electron radiation on the side thereof which is destined to be disposed radially inwardly with respect to the tire.
Claim 4
Dependent Claim
49 words
A method as claimed in claim 2 wherein more than one carcass ply is included in said tire and each carcass ply is treated with between 1 and 5 megarads on the side thereof which is destined to be the radially inward side thereof with respect to the tire.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 3 wherein the portion of said carcass ply which is destined to form the radially outer one-third of the carcass structure is subjected to said electron radiation treatment.
Claim 6
Dependent Claim
57 words
A method as claimed in claim 1 wherein the contour length of said carcass ply between corresponding points adjacent the bead cores when said carcass ply is in a generally cylindrical configuration is between 1 and 7 percent less than the contour length of said carcass ply between said points when the tire is in said mold.
Claim 7
Dependent Claim
57 words
A method as claimed in claim 2 wherein the contour length of said carcass ply between corresponding points adjacent the bead cores when said carcass ply is in a generally cylindrical configuration is between 1 and 7 percent less than the contour length of said carcass ply between said points when the tire is in said mold.
Claim 8
Dependent Claim
59 words
A method as claimed in claim 3 wherein the contour length of each carcass ply between corresponding points adjacent the bead cores when said each carcass ply is in a generally cylindrical configuration is between 1 and 7 percent less than the contour length of said each carcass ply betweEn said points when the tire is in said mold.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |