Connection means for tubular frameworks

Claim 1

CONNECTION MEANS FOR TUBULAR FRAMEWORK OF SUBSTANTIALLY SQUARE CROSS SECTION, COMPRISING, AT LEAST TWO TUBULAR MEMBERS OF SQUARE CROSS SECTION, A CONNECTION PIECE CONSISTING OF A BODY AND AT LEAST TWO TAPERING ARMS OF SUBSTANTIALLY SQUARE CROSS SECTION EXTENDING THEREFROM, AND A FLEXIBLE INSERT OF HOLLOW, SUBSTANTIALLY SQUARE, CROSS SECTION LOCATED IN THE OPEN END OF EACH ONE OF SAID TUBULAR MEMBERS, EACH OF SAID INSERTS COMPRISING AN OUTER AND AN INNER PAD PORTION CONNECTED WITH EACH OTHER BY AN INTERMEDIATE CONNECTING PORTION WHICH IS OF LESS WIDTH THAN AND MORE FLEXIBLE THAN SAID PAD PORTIONS, SAID INTERMEDIATE CONNECTION PORTIONS BEING SEPARATE FROM EACH OTHER, SAID PAD PORTIONS HAVING OUTWARDLY PROJECTING FORMATIONS ON THEIR EXTERNAL FACES TO MAKE SURFACE CONTACT WITH THE CORRESPONDING INTERNAL FACES OF THE SAID TUBULAR MEMBER WHEN THE SAID INSERT IS EXPANDED BY THE SAID INSERT ARM INTO TIGHT ENGAGEMENT WITH THE SAID TUBULAR MEMBER, AND MEANS ON ONE OF THE EXTERNAL FACES TO ENGAGE THE END FACE OF THE TUBE TO PREVENT INWARD MOVEMENT OF SAID INSERT.