Patent ID: 7806393
Filing Date: 2010-10-05
Classification: B25B

Abstract:
1. A clamp apparatus in which linear movement in a cylinder is converted into rotational movement for thereby clamping a workpiece with a clamp arm, the clamp apparatus comprising: a main body; the cylinder connected to the main body and having a piston with a piston rod therein which is displaced along an axial direction under a pressing action of a pressure fluid; the clamp arm retained by an attachment element to rotate with respect to the main body; and a driving force transmitting mechanism connected to said piston rod for transmitting a driving force from the cylinder to the clamp arm and causing rotational displacement of the clamp arm, wherein the driving force transmitting mechanism comprises: a displacement member which is displaced along the axial direction together with the piston; a guide body which rolls with respect to said displacement member being disposed on the displacement member and which abuts against a side surface of the main body such that the driving force transmitting mechanism is not inserted within the main body; and a pin member disposed on the displacement member and which is inserted through grooves of the clamp arm, wherein said guide body and said pin member remain coplanar with respect to said displacement member and said guide body and said pin member respectively while translating axially.