| 摘要 |
PROBLEM TO BE SOLVED: To open five faces excluding a supported face, among six faces of a work piece in clamping. SOLUTION: An oscillation arm 20 is mounted in a housing 10 fixed to a lower face of a jig plate 1, and a driven part 13 is mounted on a lower part of a pull-rod 11 downwardly projecting from a supported face R of the work piece 2. A piston 38 is advanced left by the pressure oil supplied to a hydraulic operation chamber 40 and the arm 20 is oscillated to a clamping piston X in clamping. Thereby an output part 20b of the arm 20 downwardly presses the driven part 13, the pull-rod 11 is downwardly pulled, and the work piece 2 is pressed to the jib plate 2. When the pressure oil is discharged from the hydraulic working chamber 40, the arm 20 is returned to an unclamping position Y by the energizing force of a compression spring 45, and the piston 38 is retracted right to release the clamping state.
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