Patent ID: 6371469
Filing Date: 2002-04-16
Classification: B23Q,B25B

Abstract:
A workpiece holder comprising in combination:a grip post having an interior wall structure and an exterior wall structure defining a plurality of expandable sections adapted to engage the wall of a bore formed on a workpiece, the grip post having a cam arrangement abutting the interior wall structure; a pin arrangement movably mounted in the grip post and having a tapered head engageable with the cam arrangement; means for instantaneously imparting longitudinal movement to the pin arrangement whereby the exterior wall structure of the grip post is expanded into gripping relationship with the workpiece by the progressive engagement of the tapered head with the cam arrangement, and a base assembly comprised of a base having a fluid passageway formed therein in communication with a source of fluid pressure, a cap joined to the base and formed with a central through hole for receiving the pin arrangement, and a gland sealably interposed between the base and the cap and provided with a bore for receiving the pin arrangement, the bore being in aligned communication with the fluid passageway and the through hole.