| 摘要 |
A clamp device C has a grip member 2 for gripping the inner peripheral surface of a hole in a workpiece, a clamp rod 3 having a tapered shaft portion 31 that is fitted into and engaged with the grip member 2, a hydraulic cylinder 4 for driving the grip member 2 and the clamp rod 3 forwards and backwards in the axial direction, and a main body member 1 to which the above elements are mounted. A tubular cylindrical main body portion 11a projecting upwards is provided at the center portion of an upper half portion of the main body member 1: the outer diameter of this tubular main body portion 11a is set less than or equal to three times the outer diameter of the grip member 2 in the unclamped state, and, in the unclamped state, the upper half portions of the grip member 2 and the tapered shaft portion 31 are made to project outward from the upper end of the tubular main body portion 11 a. |
