Tire Vulcanizing Mold for Tire Forming and Method of manufacturing the Same
AssigneeBridgestone Corporation
InventorHideaki Tanaka
Life of this patent
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Abstract
A side mold 1 of a vulcanizing mold for molding a sidewall of a tire is provided with exhaust slots 4 having outer open ends opening in the outside surface thereof, and grooves 6 of a predetermined width formed in the molding surface thereof and communicating with inner open ends of the exhaust slots 4. Flat bars 8 of a predetermined thickness made of the same material as the side mold 1 are loosely fitted in the grooves 6 such that inner end surfaces thereof are flush with the molding surface 2 of the side mold 1, and slits are defined between the flat bars and the side surfaces of the grooves. The vulcanizing mold prevents the formation of bares and spews. The slits are not easily clogged with dirt, and dirt packed in the slits can be easily removed.
Claims7
A tire vulcanizing mold comprising:
- a side mold provided with exhaust slots having outer open ends opening in an outside surface thereof, and grooves of a predetermined width formed in a molding surface thereof and communicating with inner open ends of the exhaust slots;
- and
- flat bars of a predetermined thickness loosely fitted in the grooves such that inner end surfaces thereof are flush with the molding surface of the side mold.
A method of manufacturing a vulcanizing mold comprising the steps of:
- making a workpiece for forming a side mold, having an unfinished molding surface having a finishing allowance, and provided with exhaust slots mutually communicating an inside surface and an outside surface thereof;
- forming grooves in the molding surface of the side mold so as to be communicating with inner open ends of the exhaust slots;
- loosely fitting flat bars in the grooves;
- and
- grinding the molding surface of the side mold and inner end surfaces of the flat bars simultaneously to finish the molding surface and the inner end surfaces of the flat bars.
Dependencies are inferred from the claim text.