Coupling element

Claim 1

Coupling element for the detachable coupling together of two building elements, of which the first one in its side exhibits an opening, to which an inwards facing stop dog surface in the interior of the building element is connected, and the other one exhibits a tunnel-shaped cavity, which in mounted condition is open in direction to said first element, the coupling element comprising an insert, which before the mounting operation of the two building elements can be intro-duced into the tunnel-shaped cavity and comprises for one thing a lock assembly adapted to the cross-sectional form of the tunnel-shaped cavity, to which it can be locked, and for another thing a lock bolt, which can be displaced in and locked to the lock assembly, which lock bolt exhibits a head, said head being provided with shoulders, which under axial displacement of the lock bolt can be pressed against said inwards facing stop dog surfaces, the axial displacement and the locking together taking place by means of a sideways pointing tightening screw, which can be reached through a lateral opening of the wall of the tunnel-shaped cavity, and the end portion of which tightening screw cooperates with an oblique surface of the lock bolt, said lock bolt being sub-jected to the bias of a spring in the projecting direction, characterized by the lock assembly comprising for one thing a shell case, the outer form of which follws the tunnel-shaped cavity and the inner form of which follows the outer contour of the lock bolt, and for another thing an insert, which is in sideways direction displaceable relative to the shell case and on one of its sides exhibits a socket and an axial hole, which in inserted conditiion of the lock bolt is traversed by the same, the distance between the hole and the outer limit of the lateral socket being adapted in such a way that in inserted condition of the lock bolt the socket extends outside of the outer contour of the shell case into a hole through the wall of the tunnel-shaped space and thus locks the lock assembly against any axial displacement relative to said other building element, the shell case inside of said insert supporting a transverse springing tongue, which in inserted condition of the lock bolt with spring bias abuts against its end and thus tends to push the same in outwards direction, in which arrange-ment the springing tongue in extracted condition of the lock bolt can bear against a stop dog of the insert in such a way that the springing tongue with spring bias tends to maintain the insert in a sideways displaced position relative to the shell case.