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A hydraulic clamp, which actuates a clamping means by a hydraulic pressure of a hydraulic cylinder, has a clamping actuation oil chamber, a piston and the clamping means arranged in a cylinder body of the hydraulic cylinder in this order in the axial direction of the hydraulic cylinder. The clamping means is adapted to be shifted expansively and contractively between advanced position clamping and a retracted position (unclamping) which are at different distances from the axis of the hydraulic cylinder. The clamping means is adapted to be advanced from the retracted position to the advanced position in an early stage of the application of a hydraulic actuation force in the clamping actuation oil chamber, by which the piston is hydraulically actuated, and the clamping means is adapted to be actuated for clamping by a latter stage of the hydraulic pressure in the clamping actuation oil chamber.An object of the hydraulic clamp is to provide a hydraulic clamp in which the clamping operation can be performed readily, the whole of a clamp apparatus can be made small and the clamping force per unit area can be increased. A cylinder body of a hydraulic cylinder is provided with a clamping actuation oil chamber, a piston and a clamping means arranged in this order along the axial direction of the hydraulic cylinder. The clamping means is constructed so as to be expanded and contracted between on advanced a clamping position and a retracted or unclamping position which are respectively at different distances from the axis of the hydraulic cylinder. The clamping means adapted to be pushed toward the retracted position side by a retracting means and to be pushed toward the advanced position side by an advancement slant cam. Initially, the clamping means is pushed from the retracted position to the advanced position through the advancement slant cam at an early stage of applying a hydraulic actuation force within the clamping actuation oil chamber for hydraulically actuating the piston and then the clamping means is actuated for clamping from an unclamped position to a clamped position by a latter stage of applying the hydraulic actuation force within the clamping actuation oil chamber. In the above-mentioned construction, the clamping means is adapted to be actuated in two ways for switching over from the retracted position to the advanced position, namely in a contracting manner respectively and in an expanding manner. The clamping operation becomes easy. Since the clamping means is adapted to be operated in a sequential switching interlocking with the piston within the hydraulic cylinder, it is not necessary to manipulate the clamping means manually and it becomes easy to perform the clamping operation of the hydraulic clamp.
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Plus Business Machine Limited. |
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