Patent ID: 9033323
Filing Date: 2015-05-19
Classification: B23Q,Y10T

Abstract:
1. A clamp device comprising: a clamp main body; an engagement assembly that can be changed over between a diameter-expanded state in which the engagement assembly engages with an inner circumferential surface of an aperture in a workpiece and a diameter-reduced state in which the engagement assembly does not so engage; a clamp rod that is engaged with an interior of the engagement assembly; a drive means for driving the clamp rod to and from with respect to the clamp main body; a support mechanism that, when said engagement assembly is expanded in diameter and is engaged with said inner circumferential surface, supports the engagement assembly with a pneumatic force of pressurized air at a first pressure; and a pneumatic force release means that, when the clamp rod is driven for clamping by said drive means, releases at least a part of the pneumatic force of said support mechanism after said engagement assembly has been expanded in diameter to engage with said inner circumferential surface.