Gas coupling plug cock

Claim 1

A GAS COUPLING COMPRISING A HOUSING HAVING A FIRST FLUID PORT, A ROTARY VALVE HEAD IN SAID HOUSING HAVING A SECOND FLUID PORT MOVABLE INTO AND OUT OF REGISTRY WITH SAID FIRST FLUID PORT, AN EXTENSION RIGIDLY CONNECTED ON SAID VALVE HEAD HAVING A THROUGH FLUID PASSAGE THEREIN, SAID PASSAGE HAVING ONE END OPEN AND THE OTHER END COMMUNICATING WITH SAID SECOND PORT, A MEMBER SLIDABLY AND ROTATABLY MOUNTED ON SAID EXTENSION FOR AXIAL DISPLACEMENT BETWEEN A LOCKING POSITION AND AN UNLOCKING POSITION, A COUPLING PLUG RECEIVABLE IN THE OPEN END OF SAID FLUID PASSAGE, MEANS ON SAID EXTENSION FOR LOCKING AND HOLDING SAID PLUG WHEN SAID MEMBER IS IN LOCKING POSITION, MEANS PERMITTING AXIAL DISPLACEMENT OF SAID MEMBER TO UNLOCKING POSITION ONLY WHEN SAID VALVE HEAD HAS BEEN ROTATED TO MOVE SAID PORTS OUT OF REGISTRY AND CLUTCH MEANS ASSOCIATED WITH SAID EXTENSION FOR INTERLOCKING SAID MEMBER WITH SAID VALVE HEAD WHEN SAID PLUG IS INSERTED IN SAID OPEN END AND FREEING SAID MEMBER FOR ROTATION ON SAID EXTENSION WHEN SAID PLUG IS REMOVED, WHEREBY THE SLEEVE MEMBER IS FREE TO ROTATE RELATIVE TO THE EXTENSION WHEN SAID PLUG IS REMOVED.