Patent ID: 6668949
Filing Date: 2003-12-30
Classification: E21B

Abstract:
An apparatus comprising:a tubular body having threaded connections at each end, an interior surface forming a longitudinal bore through said tubular body and an annular lip within said tubular body, and a plurality of skewed, longitudinal grooves formed in said body; a piston actuator having a lower surface, a plurality of slotted extensions and a longitudinal flow path through said piston actuator assembly, wherein said piston actuator slideably and sealingly engages the interior surface; a plurality of arms, each of said arms having a pivot and an ear, wherein each of said plurality of arms is pivotally mounted in a corresponding one of said plurality of skewed, longitudinal grooves and wherein said ear is adjacent to said pivot and engages a corresponding one of said plurality of slotted extensions; and a plurality of resilient members, wherein each of said plurality of resilient members has a first end and a second end, is located adjacent to a corresponding one of said plurality of slotted extensions, the first end engages the lower surface of the piston actuator assembly, and the second end engages the annular lip.