Subsurface well tool control mechanism

Claim 1

IN A SUBSURFACE WELL TOOL: A BODY MEMBER ADAPTED TO BE LOWERED IN A WELL BORE ON A RUNNING-IN STRING; A COMPANION MEMBER ON SAID BODY MEMBER MOVABLE LONGITUDINALLY WITH RESPECT THERETO; ONE OF SAID MEMBERS HAVING A PIN THEREON; THE OTHER OF SAID MEMBERS HAVING A CONTROL SLOT IN WHICH SAID PIN IS RELATIVELY MOVABLE, SAID CONTROL SLOT INCLUDING A LONGITUDINAL SLOT ADAPTED TO RECEIVE SAID PIN TO PERMIT RELATIVE LONGITUDINAL MOVEMENT BETWEEN SAID MEMBERS, SAID CONTROL SLOT INCLUDING A LOCKING SLOT EXTENDING LATERALLY FROM SAID LONGITUDINAL SLOT AND MERGING THEREINTO, SAID LOCKING SLOT COMPRISING UPPER AND LOWER LOCK PORTIONS OFFSET FROM SAID LONGITUDINAL SLOT, SAID UPPER LOCK PORTION HAVING A TAPERED SIDE WALL INCLINED DOWNWARDLY AT A STEEP ANGLE FROM THE UPPER END OF SAID UPPER LOCK PORTION TOWARD AND TERMINATING AT SAID LONGITUDINAL SLOT AND SAID LOWER LOCK PORTION HAVING A TAPERED SIDE WALL INCLINED UPWARDLY AT A STEEP ANGLE FROM THE LOWER END OF SAID LOWER LOCK PORTION TOWARD AND TERMINATING AT SAID LONGITUDINAL SLOT, WHEREBY SAID SIDE WALLS CONVERGE TOWARDS EACH OTHER IN THE DIRECTION OF SAID LONGITUDINAL SLOT AND DEFINE AN OPENING FOR SAID PIN BETWEEN SAID LOCKING SLOT AND SAID LONGITUDINAL SLOT, ONE OF SAID LOCK PORTIONS EXTENDING IN THE SAME DIRECTION AS SAID LONGITUDINAL SLOT BUT BEING SUBSTANTIALLY SHORTER THAN SAID LONGITUDINAL SLOT; FRICTION DRAG MEANS SECURED TO SAID COMPANION MEMBER AND FRICTIONALLY ENGAGEABLE WITH THE WALL OF THE WELL BORE TO RESIST MOVEMENT OF SAID COMPANION MEMBER THEREWITHIN; THE INCLINATIONS OF SAID TAPERED SIDE WALLS BEING SUCH THAT ENGAGEMENT BETWEEN SAID PIN AND EITHER OF SAID TAPERED SIDE WALLS WILL COUPLE SAID MEMBERS FOR ROTATION TOGETHER AND SLIDE SAID DRAG MEANS AROUND THE WALL OF THE WELL BORE.