Remote control hooking and unhooking device

Claim 1

A COUPLING ASSEMBLY FOR USE IN REMOTELY CONTROLLED LIFTING OPERATIONS, SAID COUPLING ASSEMBLY INCLUDING, IN COMBINATION, A FIRST MEMBER TO WHICH OBJECTS TO BE LIFTED MAY BE SECURED, A SECOND MEMBER ADAPTED FOR ATTACHMENT TO A LIFTING LINE, SAID FIRST AND SECOND MEMBERS BEING COMPLETELY DISENGAGEABLE, ONE FROM THE OTHER WHEREBY SAID FIRST MEMBER MAY BE PERMANENTLY SECURED TO OBJECTS TO BE LIFTED AND SAID SECOND MEMBER MAY BE TRANSFERRED FROM PLACE TO PLACE WITH SAID LIFTING LINE WHEN DISENGAGED FROM SAID FIRST MEMBER, AND MEANS POSITIVELY COUPLING THE MEMBERS TO ONE ANOTHER DURING A LIFTING, LOWERING, OR LOADED TRANSFERRING OPERATION, SAID MEANS INCLUDING A CAM TRACK FORMED IN ONE OF THE MEMBERS, SAID TRACK HAVING AN ENTRY, AN EXIT, AND A SINGLE LIFTING POSITION BETWEEN THE ENTRY AND EXIT, A CAM FOLLOWER CARRIED BY THE OTHER MEMBER, SAID TRACK AND FOLLOWER BEING SO DIMENSIONED THAT OVERALL MOVEMENT OF THE FOLLOWER ALONG THE TRACK CAN OCCUR IN ONLY ONE DIRECTION AS THE FOLLOWER MOVES ALONG THE TRACK FROM THE ENTRY TO THE EXIT.