| 摘要 |
1463847 Moulding a core of granular material CATERPILLAR TRACTOR CO 17 June 1974 [15 June 1973] 26747/74 Heading B5A A press for forming one half of a sand core on which a tube-tyre is formed comprises an annular mould body 48, 50, 54 defining an annular recessed portion 66 whereby sand and a binder located in the mould is pressed to shape by an inflatable bladder 32. A hoop 72, which is to be incorporated in the tyre, is supported in the mould by manually operated plungers 74. After tyre formation the core, which comprises two such halves, is disintegrated and removed from the tyre interior. The mould body comprises a base 16, rings 48, 50 and a closure ring 54. The latter is carried by radical members 56 of a structure 58 which is lowered on to the rings 48, 50 and attached to the base. The structure 58 is connected to rings 48, 50 by latches 60, and the bladder is supported by posts 40, a circular pipe 42 and members 44. The lower edges of the bladder are gripped between members 30, 36, and bladder inflation is effected via a valve 70. Curing of the sand core portion is effected by injecting CO 2 into it via annular manifolds 24, 26. (For Figure 2 see next page.)
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