Coupling

Claim 1

A PIPE COUPLING ASSEMBLY COMPRISING: A TUBULAR COUPLER; A MALE MEMBER INSERTABLE INTO THE COUPLER; AN ANNULAR CONCAVE RECESS IN THE OUTER PERIPHERY OF THE MALE MEMBER; MEANS FOR SEALING BETWEEN THE COUPLER AND MALE MEMBER; AT LEAST ONE PAIR OF EARS EXTENDING RADIALLY OUTWARDLY FROM THE OUTER WALLS OF SAID COUPLER; A FIRST SLOT BETWEEN SAID EARS EXTENDING AXIALLY OF THE COUPLER AND COMPLETELY THROUGH THE WALL OF THE COUPLER BETWEEN SAID EARS; A SECOND SLOT IN SAID COUPLER TRANSVERSE TO AND INTERSECTING SAID FIRST SLOT, SAID SECOND SLOT OPENING INTO THE BORE THROUGH THE COUPLER AND EXTENDING TO SAID EARS WHEREBY AN OPENING TRANSVERSE OF THE AXIS OF SAID COUPLER IS FORMED, ONE WALL OF SAID OPENING BEING DEFINED BY RADIALLY INWARD SURFACES OF SAID EARS; A CAM ARM INCLUDING A CAM SURFACE ON ONE END THEREOF FOR ENTRY INTO SAID RECESS AND HINGE PINS RIGID WITH AND EXTENDING FROM OPPOSITE SIDERS OF THE ARM, SAID PINS BEING OF LESS LENGTH THAN THE DISTANCE BETWEEN THE END WALLS FORMING SAID SECOND SLOT, BUT OF GREATER LENGTH THAN THE DISTANCE BETWEEN THE WALLS OF SAID FIRST SLOT; THE END OF SAID ARM REMOTE FROM THE CAM SURFACE ADAPTED TO BE INSERTED INTO THE BORE OF THE COUPLER AND PASSED THROUGH SAID FIRST SLOT UNTIL SAID HINGE PINS ENGAGE SAID RADIALLY INNER SURFACE OF SAID EARS THROUGH SAID SECOND SLOT; AND MEANS ON SAID ARM ENGAGEABLE WITH SAID COUPLER FOR RETAINING SAID ARM BETWEEN SAID EARS.