| 摘要 |
The head (23) carries a connector, to transmit the drive to the socket. A stop block (24) is mounted within the head to prevent reverse rotation. A locating wire (25) is mounted on the stop block. A rotating cap (27) covers the head and is secured by a screw (29), with a star shaped cavity (291) in its upper face and a central hole (292). A steel ball is fitted into the drive shaft of the connector and is fixed to secure the socket by a coupling rod (31), which passes through the hole in the screw and the corresponding hole in the connector.
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