| 摘要 |
An upper end wall (3a) and a lower end wall (3b) of a housing (3) are adapted to support an upper sliding portion (11) and a lower sliding portion (12) of a clamp rod (5), respectively. A rotary portion (26) is provided on the clamp rod (5) below a piston (15) fixed to the clamp rod (5). A rotation actuating sleeve (27) is externally fitted onto the rotary portion (26) axially movably but unrotatably. The sleeve (27) is urged upward by a pushing spring (31) and prevented from moving farther than a predetermined distance by a stopper (32). An axial movement of the clamp rod (5) is converted to a rotary movement by a converting mechanism (34).
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