Patent ID: 8585027
Filing Date: 2013-11-19
Classification: B23Q

Abstract:
1. A clamp device comprising: an annular grip member capable of being inserted into an aperture in a workpiece and gripping an inner peripheral surface of the aperture; a clamp rod having a tapered shaft portion fitted into and engaged with the grip member; a fluid pressure cylinder for driving the grip member and the clamp rod forwards and backwards in an axial direction; and a main body member to which the grip member, the clamp rod, and the fluid pressure cylinder are mounted; and wherein a first portion of an upper half of the main body member has a cylindrical outer wall extending along an upper length of said upper half, said cylindrical outer wall of said first portion having a constant outer diameter along said upper length, said outer diameter being less than an outer diameter of a vertical cylinder bore of the fluid pressure cylinder; and wherein in the unclamped state, an upper half portion of the grip member and the tapered shaft portions of the clamp rod project outwards from an upper end of the first portion, and lower half portion of the grip member and a lower portion of the clamp rod which is extending below from the tapered shaft portion are fitted in the first portion.