Apparatus for moving a well flow conductor into or out of a well

Claim 1

A GRIPPING ASSEMBLY COMPRISING: A BODY HAVING A BORE EXTENDING THERETHROUGH: A PLURALITY OF GRIPPING MEANS MOVABLE ON SAID BODY BETWEEN A RETRACTED POSITION AND AN INWARD OPERATIVE POSITION WHEREIN SAID GRIPPING MEANS ARE ENGAGEABLE WITH AN ELONGATE MEMBER RECEIVED IN SAID BORE TO GRIP SAID ELONGATE MEMBER; MEANS ON SAID BODY RESPONSIVE TO FLUID PRESSURE TO ALTERNATELY MOVE SAID GRIPPING MEANS BETWEEN SAID RETRACTED AND SAID OPERATIVE POSITIONS; AND LOCKING MEANS ON SAID BODY ENGAGEABLE WITH SAID MEANS FOR MOVING SAID GRIPPING MEANS BETWEEN RETRACTED AND OPERATIVE POSITIONS FOR LOCKING SAID GRIPPING MEANS IN SAID OPERATIVE POSITION.

Claim 2

AN APPARATUS FOR MOVING PIPE OR RODS COMPRISING: A PAIR OF CO-AXIAL CYLINDERS DEFINING AN ANNULAR CHAMBER THEREBETWEEN, THE INNER ONE OF SAID CYLINDERS HAVING A BORE EXTENDING THERETHROUGH; AN ANNULAR PISTON SLIDABLY MOUNTED IN SAID ANNULAR CHAMBER FOR LONGITUDINAL MOVEMENT RELATIVE TO SAID CYLINDERS; MEANS FOR APPLYING FLUID PRESSURE AGAINST A SELECTED SIDE OF SAID PISTON TO IMPART MOVEMENT THERETO WITHIN SAID ANNULAR CHAMBER; GRIPPING MEANS CONNECTED WITH SAID PISTON AND OPERABLE FOR GRIPPING A PIPE OR ROD DISPOSED WITHIN SAID INNER CYLINDER BORE; FLUID PRESSURE OPERATED MEANS FOR MOVING SAID GRIPPING MEANS INTO AND OUT OF POSITION FOR GRIPPING SAID PIPE OR ROD; ELONGATE PISON ROD MEANS CONNECTING SAID GRIPPING MEANS AND SAID PISTON WHEREBY SAID GRIPPING MEANS IS CONNECTED TO SAID PISTON TO MOVE THEREWITH WHEREBY A LENGTH OF PIPE OR ROD DISPOSED IN SAID BORE MAY BE MOVED THERETHROUGH IN A DIRECTION DETERMINED BY THE DIRECTION OF MOVEMENT IMPARTED TO SAID PISTON; AND SEAL MEANS CONNECTED TO THE LOWER END OF SAID CO-AXIAL CYLINDERS BELOW SAID GRIPPING MEMBERS AND HAVING A BORE THERETHROUGH, AND SEALING MEMBERS MOVABLE THEREON BETWEEN A PISITION SPACED FROM SAID PIPE OR ROD IN A POSITION SEALING AGAINST SAID PIPE OR ROD TO PREVENT FLUID PRESSURE PASSING IN EITHER DIRECTION LONGITUDINALLY OF SAID PIPE OR ROD BELOW SAID CYLINDERS.