Subsurface retrieving apparatus

Claim 1

IN APPARATUS FOR REMOVING A WELL TOOL DISPOSED IN A BORE HOLE: A MANDREL ADAPTED TO BE RUN IN THE BORE HOLE ON A RUNNING-IN STRING; RELEASABLE MEANS ROTATABLE RELATIVE TO SAID MANDREL AND ADAPTED TO BE COUPLED TO THE WELL TOOL; RETAINER MEANS ON SAID MANDREL HAVING A HOLDING PORTION ENGAGEABLE WITH SAID RELEASABLE MEANS TO HOLD SAID RELEASABLE MEANS COUPLED TO THE WELL TOOL TO ENABLE THE RUNNING-IN STRING TO ELEVATE THE WELL TOOL IN THE BORE HOLE; SAID RETAINER MEANS HAVING A RECESS CIRCUMFERENTIALLY ADJACENT TO SAID HOLDING PORTION WHEREBY ROTATION OF SAID RETAINER MEANS WITH RESPECT TO SAID RELEASABLE MEANS SHIFTS SAID HOLDING PORTION CIRCUMFERENTIALLY FROM ENGAGEMENT WITH SAID RELEASABLE MEANS AND PLACES SAID RECESS BEHIND SAID RELEASABLE MEANS PERMITTING UNCOUPLING OF SAID RELEASABLE MEANS FROM THE WELL TOOL AND MOVEMENT OF SAID RELEASABLE MEANS LONGITUDINALLY IN THE PASSAGE; AND MEANS ENGAGING SAID MANDREL AND RELEASABLE MEANS FOR ROTATING SAID RELEASABLE MEANS RELATIVE TO SAID MANDREL TO REPLACE SAID RELEASABLE MEANS IN ENGAGEMENT WITH SAID HOLDING PORTION.