主权项 |
1. A joining element connecting one or more elongate structural members, wherein a cross-sectional profile of each structural member comprises a base wall and adjoining side walls extending from, and perpendicular to, opposing ends of the base wall, each side wall comprising an inwardly-turned rib at an end distal to the base wall, such that a channel is formed between said ribs, the joining element comprising:
a central body comprising:
at least one elongate, cruciform projection insertable into a longitudinal end of a respective structural member, each cruciform projection comprising:
a hollow center portion,four orthogonally disposed, longitudinally extending protrusions arranged about a periphery thereof, each protrusion having a width substantially equal to a width of the channel,four landing surfaces, each landing surface disposed between a pair of adjacent protrusions, wherein a distance between adjacent landing surfaces is greater than the width of the channel, andat least one threaded hole extending from a periphery of one of said protrusions and extending radially through to the hollow center portion; and at least one grub screw configured to extend through the at least one threaded hole and engage with a base wall of a structural member; wherein when the grub screw is engaged with the base wall, the structural member is moved so that the ribs of the structural member are moved into engagement with a pair of adjacent landing surfaces opposite the base wall, so as to lock the joining element to the structural member. |