Patent ID: 7527093
Filing Date: 2009-05-05
Classification: E21B

Abstract:
1. An apparatus for supporting a tubular in a borehole, comprising: a base having an opening for receiving a tubular; a first gripping member and a second gripping member, each adapted to frictionally engage the tubular; a first pivot arm including at least one parallel linkage pivotally secured to the base at a lower pivot pair and pivotally secured to the first gripping member at an upper pivot pair positionable above the lower pivot pair; a second pivot arm including at least one parallel linkage pivotally secured to the base at a lower pivot pair and pivotally secured to the second gripping member at an upper pivot pair positionable above the lower pivot pair; and an actuator comprising: wherein the first and second threaded portions are reverse-threaded; and wherein rotation of the threaded rod positions the first and second gripping members.