| 摘要 |
An open-end bladder for vulcanizing a pneumatic tire. The bladder has an annular form and a pair of opening extending through the bladder in the axial direction of the bladder. A pressure fluid is introduced into the bladder to bring it into pressure contact with the still unvulcanized tire to preshape it and to support the tire on the inside surface of the tire at the same time of the vulcanization. The bladder comprises corners extending outward from both metal-clamped end portions having the openings, first oblique portions curved and extending outward from the corners, second oblique portions extending outward from the first oblique portions, and a convex portion curved and extending outward from the second oblique portions to the maximum-diameter cross section of the bladder to couple the upper and lower halves of the bladder to each other. The thickness of the bladder is gradually decreased from the portions of the bladder, which correspond to the beads of the still unvulcanized tire, to the portion of the bladder, which corresponds to the tread of the still unvulcanized tire.
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