| 摘要 |
PURPOSE:To improve dimensional stability, air-tightness, strength and durability of a rubber bag, by adhering a rubber layer and a reinforcing layer on the inner circumferential faces of molds for a trunk part and a mirror part made of a rigid material and connecting them each other in a state where they are being combined. CONSTITUTION:A specific rubber sheet 2 and 4 and a rubber coated canvas 5 are adhered on the inner circumferential faces of a mold 1 for a trunk part and a mold 3 for a mirror part to form a trunk part and a cap-shaped mirror part. Then, both ends of the mold 1 for the trunk part are connected with the mold 3 for the mirror part in a specific relation of positioning. Then, a rubber sheet 11 which can completely fill the gap of about 200mm formed by the rubber sheet 2 adhered on the mold 1 for the trunk part and the rubber sheet 4 adhered on the mold 3 for the mirror part, is adhered in the circumferential direction by striding over both molds 1 and 3 and moreover, a rubber coated canvas 12 adhering strongly on the inner circumference is adhered in the circumferential direction. The trunk part 9 and the cap-shaped mirror part 10 are thereby mutually connected and vulcanization is carried out after molding a rubber bag.
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