Patent ID: 6116118
Filing Date: 2000-09-12
Classification: B25B,E21B

Abstract:
Apparatus for gripping the exterior surface of a tubular member to resist rotation of the member from torque applied in either direction about the longitudinal axis of the tubular member comprising:(a) a body adapted to receive a tubular member;(b) a reactive gripping jaw attached to the body;(c) a pair of arms pivotally mounted on the body about axes parallel with the longitudinal axis of the tubular member, each arm having a first end and a second end;an active gripping jaw mounted on and moveable with respect to the first end of each of said arms;(e) a force multiplying device interposed between the second ends of the arms adapted for engagement with the second ends of the arms; and(f) an actuator coupled to the force multiplying device which moves the force multiplying device in a first direction to engage the second ends of the arms and thereby move the active gripping jaws toward the tubular member until the tubular member is secured between the reactive gripping jaw and the active gripping jaws with a force sufficient to prevent rotation of the tubular member at a predetermined applied torque.