Patent ID: 6666120
Filing Date: 2003-12-23
Classification: B23B,Y10T

Abstract:
A facedriver of the type including a base member with a forward end, an axially-aligned, forwardly-biased centerpoint member with a lateral surface and slidably disposed with respect to the base member, and drivepins slidably disposed in the base member and supported rearwardly by fluid in drivepin portions of a fluid-containing chamber within the base member, the facedriver further comprising:a substantially axially-fixed grip member fixed to the base member and contacting the lateral surface of the centerpoint member; and a grip portion of the fluid chamber adjacent to the grip member for fluid contact therewith, the grip portion of the fluid chamber and the grip member being configured and arranged such that the grip member is between the fluid and the centerpoint member and varying fluid pressure in the fluid chamber applies varying radial gripping force on the centerpoint member through the grip member.