Patent ID: 6182977
Filing Date: 2001-02-06
Classification: B25B,Y10T

Abstract:
A clamping apparatus comprising:a single-piece clamping ring having a U-shaped cross-sectional profile including a pair of flange parts and a connecting web part;the web part having a side facing away from the flange parts configured as a clamping surface for clamping a workpiece having a longitudinal axis, each flange part being positioned to form one end wall of the clamping ring, each flange part having an outer end surface parallel to the outer end surface of the other flange part;the clamping surface of the clamping ring configured to be approximately equidistant from a surface of the workpiece to be clamped,a plurality of clamping elements located on the clamping surface and extending longitudinally across the clamping ring, said clamping elements comprising a material having a higher strength than that of the clamping ring and being arranged on the clamping ring so that a portion of each clamping element facing the workpiece is exposed;a holding device for the clamping ring, said holding device having a circumferential recess configured to receive said clamping ring; said holding device having a passage connected to a pressure source for an operating medium at one end and opening at the other end into the circumferential recess of the holding device; the holding device including a clamping device for fully clamping the clamping elements in the longitudinal direction, the clamping device having an annular, intrinsically closed clamping part adapted to move in the longitudinal direction on the holding device and configured to form one side wall of the circumferential recess of the holding device;a circumferential seal element is positioned between a circumferential surface of the clamping part that faces away from the workpiece and a circumferential surface of the holding device which is opposite the first said circumferential surface;wherein the clamping part is movable in the longitudinal direction on the holding device from a release position into a clamping position by means of a power drive.