| 摘要 |
A pulley block has a body which rotatably supports a sheave, the block having a mounting pin which extends through a bore in the block. The pin has an enlarged head disposed internally of the body to retain the pin in the bore. Rotation of the pin may be prevented by a releasable locking arrangement comprising a groove formed transversely across the enlarged head of the pin and a lock member rotatably mounted in a hole extending within the block adjacent the head of the pin. The lock member is profiled for rotation between a locked position where a part of the lock member locates in the groove in the head of the pin to restrain rotation of the pin and a free position where the lock member is free of the head of the pin so that the pin may rotate.
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