Tube connecting fastener

Claim 1

A TUBE CONNECTING FASTENER FOR SECURING HOLLOW METAL TUBES TO ONE ANOTHER IN RIGHT ANGULAR RELATION AND COMPRISING A U-SHAPED BODY MEMBER HAVING A BASE PORTION AND SPACED ARM PORTIONS, SAID BASE PORTION HAVING A PROJECTING SHOULDER OF DESIRABLE CONFIGURATION ON THE BASE THEREOF AND SAID ARM PORTION HAVING A PAIR OF OPPOSITELY DISPOSED, LONGITUDINALLY EXTENING EXPANSION MEMBERS SECURED THERETO IN SPACED RELATION SO AS TO EXTEND OUTWARDLY THEREBEYOND, SAID MEMBERS EACH HAVING A LONGITUDINAL FLANGE THEREON ONE OF SAID EXPANSION MEMBERS HAVING A TAB ON A SIDE OPPOSITE TO SAID FLANGE AND EXTENDING OUTWARDLY A DISTANCE EQUAL TO THE DISTANCE OF SAID FLANGE AND ADAPTED TO LOOSELY ENGAGE THE FLANGE OF THE OTHER OF SAID EXPANSION MEMBERS TO HOLD THE SAME IN SPACED RELATION, ONE OF SAID EXPANSION MEMBERS HAS A FLANGE OF GREATER WIDTH THAN THE SPACE BETWEEN SAID EXPANSION MEMBERS AND IS DISPOSED AT AN ANGLE THERETO AND IS MOVABLE TOWARD THE FLANGE ON THE OTHER OF SAID EXPANSION MEMBERS TO MOVE SAID FLANGES APART SAID FLANGES BEING APERTURED TOR RECEIVE METAL SCREWS FOR DISTORTING SAID FLANGES TO INCREASE THE EFFECTIVE SPACING THEREOF WHEN INSERTED IN ONE OF SAID METAL TUBES, A BOLT POSITIONED THROUGH THE BASE OF SAID U-SHAPED BODY MEMBER AND EXTENDING IN A DIRECTION OPPOSITE TO SAID EXPANSION MEMBERS AND AN ARCUATE NUT ON SAID BOLT OF A CONFIGURATION ENABLING IT TO BE POSITIONED THROUGH A SHAPED APERTURE IN THE OTHER ONE OF THE HOLLOW METAL TUBES SAID NUT HAVING OUTER DIMENSIONS GREATER THAN SAID APERTURE.