Abstract: A hinged joint is described for connecting an outer housing frame member to an inner housing frame member, the hinged joint comprising an outer housing associated with the outer housing frame member, the outer housing having an elongate seat disposed between opposing side walls, and a hinge pin supported by each of said side walls; an inner housing associated with an inner housing frame member, the inner housing being at least partially receivable on the elongate seat of the outer housing, the hinge pin being operatively locatable in a hinge pin guide of the inner housing, the hinge pin guide having a locking guide part and an unlocking guide part, wherein movement of the outer housing is in association with movement of the hinge pin in the hinge guide of the inner housing. Frames comprising a plurality of frame members connected by the hinged joint are also described.