Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
2000-11-09
2003-09-30
Knable, Geoffrey L. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C156S115000, C156S133000
Reexamination Certificate
active
06626218
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a tubeless pneumatic tire in which air leakage from a puncture in a tread due to running over of a nail and the like can be suppressed and a method of producing the same.
BACKGROUND TECHNIQUE
As one of means for preventing generation of air leakage from a puncture portion due to running over of a nail and the like, there is proposed a pneumatic tire having a seal layer in which a puncture sealant for sealing a nail puncture and the like is sealed inside a tread.
Such a tire can be produced by directly coating an inner liner rubber bonded to a molding former with the sealant, then by bonding a carcass ply and a tread rubber to mold a tire raw cover in a raw cover molding step before vulcanization, and by vulcanizing the tire raw cover.
As another method, there is proposed (Japanese Patent Application Laid-open No. 8-323875, for example) a method in which a tire t is vulcanized to form a sack-shaped portion d where inner liner rubber a does not adhere to a sealing rubber sheet b by applying a mold release agent c such as talc between the inner liner rubber a facing a tire inner cavity and the sealing rubber sheet b attached to an inside of the inner liner rubber a and a puncture sealant is injected through an injection hole e communicating with an inside of the sack-shaped portion d by using an injector f after the vulcanization as shown in FIG.
7
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In the former method, however, the step for applying the sealant is troublesome, variations are generated in dimensions of the application, and it is difficult to obtain a uniform seal layer and the uniform tire. In the latter method, because the injection step for injecting the sealant into the sack-shaped portion d after vulcanization of the tire is necessary and a closing step for closing the injection hole e for injecting the sealant is required additionally, a producing process becomes complicated.
DISCLOSURE OF THE INVENTION
The present invention has been accomplished with the above circumstance in view and it is an object of the invention to provide a pneumatic tire having a puncture sealing function which can be produced easily without the above application step and injection step of the sealant and the closing operation of the injection hole and a method of producing the same.
To achieve the above object, a pneumatic tire of the invention has a toroidal shape in which bead portions are connected to sidewall portions extending radially inward from opposite ends of a tread portion and a sealant for preventing a blowout is disposed to extend in a circumferential direction in the tread portion, wherein a seal unit formed by sealing the sealant for preventing the blowout in a sack-shaped member in advance is disposed to extend in the circumferential direction of the tire in the tread portion prior to vulcanization.
A method of producing a pneumatic tire having a toroidal shape in which bead portions are connected to sidewall portions extending radially inward from opposite ends of a tread portion and a sealant for preventing a blowout is disposed to extend in a circumferential direction in the tread portion comprises: an inner liner rubber bonding step for bonding an inner liner rubber onto a molding former; a seal layer forming step for bonding a seal unit formed by sealing the sealant for preventing the blowout in a sack-shaped member in advance to an outer face of the inner liner rubber and forming a seal layer such that the seal layer extends in the circumferential direction of the tire, a carcass ply bonding step for bonding a carcass ply to an outside of the seal unit, a raw cover body forming step for adding other tire main body structure material including bead cores to form a raw cover body; and a vulcanizing step for vulcanizing the raw cover body.
REFERENCES:
patent: 1419470 (1922-06-01), Reasoner et al.
patent: 4239076 (1980-12-01), Chautard et al.
patent: 4388261 (1983-06-01), Codispoti et al.
patent: 198 39 911 (2000-03-01), None
patent: 0893236 (1999-01-01), None
patent: B1-3410934 (1959-12-01), None
patent: A4726433 (1972-10-01), None
patent: A4726481 (1972-10-01), None
patent: A4849864 (1973-07-01), None
patent: B1-5025683 (1975-08-01), None
patent: A53124803 (1978-10-01), None
patent: A6064834 (1985-04-01), None
patent: 8323875 (1996-12-01), None
Ishikawa Takeshi
Ochiai Kiyoshi
Birch & Stewart Kolasch & Birch, LLP
Knable Geoffrey L.
Sumitomo Rubber Industries Ltd.
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