Tie members for angled joints

A tie member for forming an angled joint between two obliquely cut hollow members, said member comprising two non-deformable oppositely-faced parts each having two arms whose shape and included angle are suitable to enable them to fit into either of the hollow members to be joined, the arms of one part coming into place adjacent those walls of the hollow members which are situated on the inside of the angle and the arms of the other part coming into place adjacent the opposing walls situated on the outside of the angle, and the corners of the two parts being situated near the plane of junction of the two hollow members, said tie member also having means for moving one part relative to the other which are so arranged as to enable the parts to be moved apart by a pressure exerted where their corners are situated, and wherein one of said parts contains two retractable plungers, one of which is carried by one arm and is arranged to slide substantially perpendicularly thereto in an opening formed in said arm, and the other of which is carried by the other said arm and slides in a similar fashion, spring members arranged to cause each said plunger to project from the appropriate arm towards the adjacent wall of one of the hollow members so that said plunger can enter and latch in a bore formed in said wall, and wherein means are arranged between the facing arms of said two parts to form a resilient connection between said two parts and prevent them from becoming detached from one another.