| 摘要 |
A drive piston ( 11 ) is inserted into a housing ( 8 ) vertically movably. A pull rod ( 18 ) is projected further upward than a support surface (S) of the housing ( 8 ), and the pull rod ( 18 ) is connected to the drive piston ( 11 ) radially movably. An inner engaging member ( 38 ) is supported on an outer periphery of the pull rod ( 18 ) vertically movably. The inner engaging member ( 38 ) is adapted to be radially movable with respect to the housing ( 8 ), and the inner engaging member ( 38 ) is advanced upward by a coned disc spring ( 41 ). A plurality of outer engaging members ( 39 ) to be inserted into an engaging hole ( 3 ) of a work pallet ( 2 ) are arranged on an outer periphery of the inner engaging member ( 38 ). The plurality of outer engaging members ( 39 ) are wedge-engaged with the inner engaging member ( 38 ) from the upper side. To these outer engaging members ( 39 ) is joined an upper portion of the pull rod ( 18 ). The plurality of outer engaging members ( 39 ) are urged radially inward by a ring-shaped flat spring ( 44 ).
|
