| 摘要 |
A central pillar ( 20 ) is projected upward from a reference block ( 1 ), and an inner sleeve ( 21 ) is fitted to an outer periphery of the central pillar ( 20 ) vertically movably. The inner sleeve ( 21 ) is pushed upward by a coned disc spring ( 25 ). An outer sleeve ( 31 ) to be inserted into a socket hole ( 3 ) of a movable block ( 2 ) makes a tapering engagement with the inner sleeve ( 21 ) from above. The inner sleeve ( 21 ) and the outer sleeve ( 31 ) are adapted to be diametrically expandable and contractible. An output member ( 36 ) is inserted into the central pillar ( 20 ), and an upper portion of the output member ( 36 ) is connected to the outer sleeve ( 31 ). A driving mechanism (D) in the reference block ( 1 ) moves the outer sleeve ( 31 ) downward for locking via the output member ( 36 ).
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