Locking device with a guard lock for safety doors

Locking device having a guard lock for

• safety doors, comprising:
• a mechanical actuator which can be
• fastened on a movable door part and
• a housing which interacts with the actuator and can be fastened to a door counterpart, which housing comprises:
• a receptor to which the actuator can be inserted, and
• a locking element which is displaceable between an unlocked position, in which the actuator can be released, and a locked position, in which the actuator can be fixed relative to the receptor,
• wherein the actuator comprises an engagement tongue having an engagement recess for mechanical operative catch engagement with a conical head end of the locking element in form of an engagement plunger, the engagement plunger being guided in the housing so as to be longitudinally displaceable in a spring-biased manner in a plunger longitudinal direction relative to an inner fixed bearing, the inner fixed bearing carrying radially displaceable and fixable engagement elements which lock the engagement plunger at its inner contour in the locked position during a defined state, for which purpose the engagement plunger comprises an engagement stop at the inner contour which acts in the longitudinal direction,
• wherein the engagement recess formed on the engagement tongue of the actuator is rotationally symmetrical for operative engagement with the conical head end of the engagement plunger as counterpart,
• wherein said engagement recess and said head end are centering themselves by shape adaptation,
• wherein the receptor comprises an insertion/pivot range for the engagement tongue in the unlocked position of at least 180°,
• wherein the catch engagement is achieved by the engagement plunger driven against biasing force towards a locking shaft, which in return runs the engagement tongue into the engagement recess located there in a snap-in manner, and
• wherein the engagement plunger is guard locked towards said locking shaft by said engagement elements preventing a dipping of the engagement plunger against said biasing force towards the locking shaft.