Patent ID: 8132800
Filing Date: 2012-03-13
Classification: B25B

Abstract:
1. A clamp apparatus, in which linear motion of a cylinder is converted to rotary motion by a toggle link mechanism and a workpiece is clamped by a clamp arm, comprising: a main body; a cylinder connected to said main body and having a piston that is displaced in an axial direction under a pressing action of a pressure fluid; a switching mechanism, which is disposed detachably with respect to said main body, having an operating element operable by an operator, and a transmission section for transmitting a driving force applied by said operating element to said cylinder, said switching mechanism displacing said piston in the axial direction by operation of said operating element through said transmission section to switch between clamped and unclamped states of said workpiece, wherein said transmission section comprises a first linkage connected to said operating element, which is rotationally displaceable together with said operating element, a second linkage axially supported rotatably with respect to said first linkage, and a connecting member retained on an end of said second linkage and being displaced substantially in parallel with a displacement direction of said piston.