Coupling for suction cleaner attachments

Claim 1

A COUPLING ADAPTED FOR USE WITH A SUCTION CLEANER COMPRISING: (A) A TUBULAR MEMBER, (B) AN ELONGATED MEMBER TELESCOPED INTO ONE END OF SAID TUBULAR MEMBER, (C) AN EXTERNALLY FACING RECESS IN SAID TUBULAR MEMBER ADJACENT SAID ONE END, (D) A LOCKING COLLAR MOUNTED IN SAID RECESS FOR ROTATION IN OPPOSITE DIRECTIONS TO LOCKED AND UNLOCKED POSITIONS, (E) SAID COLLAR BEING SPLIT LONGITUDINALLY OF SAID TUBULAR MEMBER SO THAT THE ENDS OF SAID SPLIT MAY BE SPREAD APART TO TELESCOPE SAID COLLAR OVER SAID ONE END OF SAID TUBULAR MEMBER INTO SAID RECESS TO ASSEMBLED SAID COLLAR IN THE LATTER, (F) MEANS DEFINING A SLOT IN SAID TUBULAR MEMBER EXTENDING FROM SAID ONE END THEREOF INTO SAID RECESS AND TERMINATING IN AN END WALL INTEGRAL WITH SAID TUBULAR MEMBER, AND ARCUATE RECESSES FORMED IN THE BOTTOM WALL OF SAID EXTERNALLY FACING RECESS ON OPPOSITE SIDES OF SAID SLOT, SAID ARCUATE RECESSES HAVING END WALLS WHICH LIMIT THE ROTATION OF SAID COLLAR IN BOTH DIRECTIONS, (G) A LOCKING LUG ON SAID ELONGATED MEMBER MOVABLE THROUGH SAID SLOT AND TRANSVERSELY OF SAID RECESS INTO ABUTTING ENGAGEMENT WITH SAID END WALL ON SAID TUBULAR MEMBER DURING TELESCOPIC CONNECTION OF SAID MEMBERS, (H) MEANS DEFINING A GROOVE IN SAID COLLAR EXTENDING LONGITUDINALLY OF SAID MEMBERS AND ADAPTED TO RECEIVE SAID LUG WHEN SAID COLLAR IS IN ITS UNLOCKED POSITION, (I) A CAM SURFACE ON SAID COLLAR DEPENDING INTO SAID EXTERNAL RECESS AND ARRANGED AT ONE SIDE OF SAID GROOVE ADJACENT SAID ONE END OF SAID TUBULAR MEMBER, (J) SAID COLLAR WHEN ROTATED TO ITS UNLOCKED POSITION HAVING ITS GROOVE IN ALIGNMENT WITH SAID SLOT FOR RECEIVING SAID LUG ON SAID ELONGATED MEMBER AND UPON ROTATION OF SAID COLLAR TO ITS LOCKED POSITION SAID CAM SURFACE ENGAGING SAID LUG TO EFFECT MOVEMENT OF SAID ELONGATED MEMBER INWARDLY OF SAID TUBULAR MEMBER WITH SAID LUG ABUTTING SAID END WALL ON SAID TUBULAR MEMBER.