Valved coupling with fusible safety cut-off means

Claim 1

A COUPLING HAVING FLUID PASSAWGEWAY THERETHROUGH, A SELF-CLOSING VALVE DISPOSED IN SAID PASSAGEWAY AND BIASED IN ONE DIRECTION TO A VALVE-CLOSED POSITION CLOSING THE PASSAGEWAY THROUGH THE COUPLING, A SLEEVE MEMBER IN SAID PASSAGEWAY HAVING A FIRST POSITION ENGAGING AND HOLDING SAID VALVE IN AN OPEN POSITION AGAINST THE BIAS ON THE VALVE AND PROVIDING FOR FLOW COMMUNICATION THROUGH SAID PASSAGEWAY AND SLIDABLE TO A SECOND POSITION WHEREIN SAID VALVE IS ADAPTED TO CLOSE UNDER THE BIAS THEREON, SAID SLEEVE MEMBER HAVING AN AXIALLY EXTENDING PORTION CLOSELY FITTING SAID PASSAGEWAY AND COARRESPONDING IN CROSS SECTION TO THE LATTER FUSIBLE MATERIAL CONNECTING SAID SLEEVE MEMBER TO THE SIDE WALL OF SAID PASSAGEWAY AND RELEASABLY HOLDING SAID MEMBER IN ITS FIRST SAID POSITION, SAID FUSIBLE MATERIAL EXTENDING SUBSTANTIALLY ENTIRELY ABOUT SAUD SLEEVE MEMBER FOR SUBSTANTIALLY THE AXIAL LENGTH THEREOF.