Abstract: Device for joining together, in a longitudinal direction (X—X), two parts arranged at 90° with respect to each other, comprising a head integral with one of the two parts to be joined, a pin integral with the other of the said parts to be joined, the head having, arranged inside it, a gearing able to be actuated in a direction (Y—Y) perpendicular to the longitudinal joining direction and operate the pin so to determine joining together of the two parts in the longitudinal direction (X—X).

Abstract: Device for rapidly fixing cross-pieces to pairs of uprights, in particular pairs of legs of chairs, tables and the like, in which the cross-piece have inserted within a pair of cylindrical elements which each have a first thread in opposite directions to each other for insertion, axially, into the opposite ends of the cross-piece and a second thread in the same direction as the respective first thread for insertion into a corresponding seat of the uprights, the rotation of the cross-piece in the same direction causing the simultaneous pulling of the two opposite uprights until they come into stable contact against the opposite ends of the cross-piece.