Joining device

Claim 1

A joining device for joining first and second boardlike furniture parts meeting at an angle, preferably at right angles, with respect to each other, comprising: first and second fittings adapted to be mounted fixedly into first and second mortises respectively in said first and second furniture parts, said first fitting comprising a turn wedge with a spiral-shaped locking wedge which is mounted in said first fitting for turning out of a starting position in which it is turned back into said first fitting, into a locking position in which it emerges from said first furniture part, said second fitting having in its surface facing said first fitting, an elongated undercut recess into which the locking wedge can engage, said first and second fittings being in the form of substantially cylindrical, plastic drive-in cups adapted to be inserted into said first and second mortises respectively, said first and second mortises having orifices on one side face of said first and second furniture parts respectively, said first mortise being broken-through to an edge of said first furniture part for the passage of said turn wedge, and said first fitting having a flattened portion at its side associated with said break-through such that the flattened portion open for the passage of the turn wedge is approximately flush with said edge when in its proper position of assembly, said locking wedge being formed by a marginal molding projecting in opposite directions over more then 180° from the marginal portion of a disk-like base part provided with pivots for mounting in said first fitting, said marginal molding having surfaces on opposite sides of said base part, which surfaces extend spiral-like and face said pivots and engage behind inner surfaces of two locking abutments projecting from opposite lateral surfaces of said elongated recess in said second fitting, said first fitting being composed of a cup having a bottom and integral therewith a circumferential wall which is cylindrical with the exception of said flattened portion and which is open on the side opposite to said bottom, and an obturator inserted in the open side of said cup, and bearings for the pivots of the turn wedge being provided in said bottom and in said obturator, the bottom of the cup being located within the mortise of said first furniture part, whereas a cover part located in the area of the opening of the mortise is made from metal and protrudes radially at least in a partial area thereof beyond the outer surface of the circumferential wall of the cup and thereby forms a base abutment when the cup is pressed into or pounded into the mortise of said first furniture part.