Internal pipe wrench

摘要

An internal pipe wrench adapted to engage the inner walls of a pipe for applying torque thereto. The wrench comprises a rotatable mandrel which is generally triangular in cross-section and three cooperating gripping jaws movable into gripping engagement with the pipe upon rotation of the mandrel. The gripping jaws are retained in operable proximity with the mandrel by means of a yieldably resilient rubber or plastic material and are uniformly configured so that upon rotation of the mandrel in either direction, the leading edge of the gripping jaws will move into positive gripping engagement with the inner walls of the pipe.