| 摘要 |
PURPOSE: Clamp ring structure for fixing a bladder is provided to extend the durability of the bladder by preventing the bladder from being folded upon contracting the bladder and to avoid damage to a tire. CONSTITUTION: One pair of clamp rings is installed on upper and lower parts of a boom. A clamp end of a bladder is inserted between the clamp rings. An outer circumferential face(20) of the clamp ring(2) contacting an inner face of the bladder is formed in a polygonal shape. A pressure source in the bladder is removed to withdraw a tire from a vulcanizing die so that the bladder is contracted. In this process, an inner circumferential face of the bladder is supported on the outer circumferential face of the clamp ring. At the same time, the outer circumferential face of the bladder is contracted into the polygonal shape equally to a shape of the outer circumferential face of the clamp ring. Thus, a protruding event generated as the outer circumference of the bladder is rapidly folded is prevented.
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