Plastic article or earthenware shaping or treating: apparatus – Reshaping – resizing or vulcanizing means for tire – tire... – Toroidal or annular female shaping means and coacting means...
Reexamination Certificate
2007-11-06
2007-11-06
Mackey, James (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Reshaping, resizing or vulcanizing means for tire, tire...
Toroidal or annular female shaping means and coacting means...
C425S028100, C425S812000
Reexamination Certificate
active
11407919
ABSTRACT:
A vulcanizing mold for pneumatic tires includes a plurality of mold pieces for forming a tread portion of the tire, which can be assembled with each other in a circumferential direction of the tire. Each mold piece has a molding surface for forming a tread pattern of the tire tread portion, and end surfaces where adjacent mold pieces are in abutment with each other when they are assembled. The end surface of the mold piece includes an edge region adjacent to the molding surface and extending in a width direction of the tread portion. The mold piece has a vent passage communicating with atmosphere, formed of a narrow gap along the edge region over substantially entire width of the tread portion, and additional vent passage in the molding surface, formed of fine unevenness communicating with the narrow gap, and/or fine apertures at a region corresponding to a land in the tread portion and isolated from the narrow gap.
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Bridgestone Corporation
Mackey James
Oliff & Berridg,e PLC
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