Patent ID: 6095509
Filing Date: 2000-08-01
Classification: B23B,B23Q,B25B

Abstract:
A clamping apparatus, comprising:a driving means (15) provided within a housing (11);a pull rod (12) having an axis and being reciprocally movable in an axial direction by the driving means (15);a tapered outer peripheral surface (12a) provided on the pull rod (12), the tapered outer peripheral surface (12a) narrowing toward a first end in the axial direction;an annular member (13) externally fitted onto the pull rod (12) so as to be movable in the axial direction;an engaging member (14) provided on a peripheral wall of the annular member (13) and arranged in an outer peripheral space of the tapered outer peripheral surface (12a) so as to be inserted into an engaging hole (2) of an object (1) to be fixed;an annular gap (31) defined between the housing (11) and an outer peripheral surface of the annular member (13), the annular gap (31) being communicated with a cleaning fluid supply port (40) provided in the housing (11); anda support means (29) inhibiting the engaging member (14) from displacing to the first end in the axial direction with a predetermined supporting force and allowing the engaging member (14) to displace to the first end with a force larger than the supporting force,wherein the pull rod (12), when driven toward the first end, makes the tapered outer peripheral surface (12a) change over the engaging member (14) to an engaging position (X) far away from the axis so as to engage it with the engaging hole (2) and displacing the engaging member (14) to the first end against the support means (29), thereby adapting a driving force of the pull rod (12) to be transmissible to the object (1) to be fixed,and on the other hand, when driven toward a second end in the axial direction, the pull rod (12) allows the engaging member (14) to change over to a disengaging position (Y) close to the axis.