Patent ID: 6089577
Filing Date: 2000-07-18
Classification: B23B,B25J,Y10T

Abstract:
A two-drive-system fluid pressure chuck comprising:two sets of jaw members that can chuck a workpiece from two orthogonal directions and that can be opened and closed in a radial direction;two cylinder apparatuses including a first cylinder apparatus and a second cylinder apparatus provided so as to correspond to the two sets of jaw members; anda cam arrangement configured to convert reciprocal operations of a piston and a rod in each cylinder apparatus into the opening and closing operations of said jaw members, wherein:said two cylinder apparatuses are coaxially disposed, a first rod in the first cylinder apparatus slidably penetrating an inside of a second rod in the second cylinder apparatus, said first rod and said second rod each having a tip aligned at a center of an arrangement of said jaw members,said cam arrangement includes a tilted cam-receiving groove formed in each of said jaw members and a cam member formed on a side of the tip of each of said rods to extend toward each jaw member, said cam member having a tilted cam that is fitted in said cam-receiving groove, andthe side of said second rod has a notch provided thereon in such a way that the cam member of said first rod is movably fitted in the notch.