Well coupling

Claim 1

IN A WELL COUPLING, A TUBULAR FIRST MEMBER, A LOCKING SLEEVE ROTATABLY FITTED WITHIN SAID FIRST MEMBER, SHEARABLE MEANS RESISTING ROTATION OF SAID SLEEVE, MEANS LIMITING AXIAL MOVEMENT OF SAID SLEEVE WITHIN SAID FIRST MEMBER, SAID SLEEVE HAVING AN ENDWARDLY OPENING SLOT THEREIN, A LATCHING SLEEVE HAVING AN ENDWARDLY PROJECTING LUG, SAID LATCHING SLEEVE BEING AXIALLY SLIDABLY RECEIVED IN SAID FIRST MEMBER FOR MOVEMENT BETWEEN A LATCHING POSITION WITH SAID LUG FITTED WITHIN SAID SLOT AND AN UNLATCHED POSITION WITH SAID LUG WITHDRAWN FROM SAID SLOT, MEANS YIELDABLY URGING SAID LATCHING SLEEVE TOWARD ITS LATCHING POSITION, SAID SHEARABLE MEANS HOLDING SAID LOCKING SLEEVE IN A POSITION WHEREIN SAID LUG AND SLOT ARE CIRCUMFERENTIALLY DISPLACED FROM EACH OTHER SO THAT SAID YIELDABLE MEANS URGES SAID LUG INTO ENDWARDLY BEARING ENGAGEMENT AGAINST SAID LOCKING SLEEVE, A SECOND COUPLING MEMBER INSERTABLE INTO SAID LOCKING SLEEVE, AND MEANS ON SAID LOCKING SLEEVE AND SAID SECOND MEMBER FOR IMPOSING TORQUE ON SAID LOCKING SLEEVE WHEN SAID SECOND MEMBER IS THRUST INTO SAID LOCKING SLEEVE THEREBY TO BREAK SAID SHEARABLE MEANS AND TO MOVE SAID SLOT INTO ALIGNMENT WITH SAID LUG AND FOR PRECLUDING REMOVAL OF SAID SECOND MEMBER FROM SAID LOCKING SLEEVE WHEN SAID LUG IS FITTED INTO SAID SLOT.