Abstract: The invention relates to an apparatus for detachably connecting two parts. It has a receiving part (1) which possesses a housing (3a). A lock (5a) which has a bevelled entrance (7a) is mounted in the housing (3a). A locking pin (9d) having a displacement part (12a) is used for locking or for latching with the lock (5a), which is kept pressed in the locking direction by a rubber ring (16). A spring or block acts against movement of the locking pin (arrow 57). An unlocking part (11a) is mounted on the shaft of the locking pin (9d) so that the said unlocking part can slide in the direction of movement (arrow 57). The locking pin (9d) carries a thrust plate (8) on its end facing away from the displacement part (12a). If pressure is exerted on this thrust plate, the displacement part (12a) initially interlocks with the lock (5a).