| 摘要 |
A supporting face ( 1 a) is provided on a base plate ( 1 ), a face ( 2 a) to be supported is provided on a work pallet ( 2 ), and an engagement hole ( 3 ) is opened in the face ( 2 a) to be supported. A core column ( 11 ) is projected upward from a housing ( 9 ) fixed to the base plate ( 1 ). An elastic sleeve ( 12 ) that fits in the engagement hole ( 3 ) is supported in a space at the outer periphery of the core column ( 11 ), on the upper face of the housing ( 9 ). Wedge spaces (W) narrowing downward are circumferentially arranged at an substantially equal intervals between the core column ( 11 ) and the elastic sleeve ( 12 ). Wedge members ( 15 ) are vertically movably inserted in each of the wedge spaces (W). Input portions ( 20 ) of the wedge members ( 15 ) are connected to an output portion ( 44 ) of an upper rod ( 43 ) of a piston ( 33 ).
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