the direction towards the mounting place the bottom of which channel continues in the mounting plate 20 by reason hereof with the bolt 9 advanced the mounting plate 20 can come into position overlapping the lock front 1 see fig1 the lever 19 cooperates with two abutments 24 and 25 fixed in position on the lock cover 3 these abutments are spaced from each other in the closing direction of the bolt furthermore the abutments 24 25 are so shifted in vertical direction from each other that the abutment 25 adjacent the lock front 1 lies higher but extends at the height of the channel 23 the upper side wall of the channel 23 has a stepped down alignment with the formation of a blocking extension 26 in front of which the bolt 24 extends in the rearward closed position of the bolt 9 see fig1 the bolt 9 is thus blocked against moving forward the driving of the bolt 9 is effected upon the closing rotation of the closure member 6 39 via a step up lever 27 the latter is a single arm lever the pivot point 28 of which lies at the height of the lower rounding flanged section 8 39 of the profiled cylinder insertion opening 8 on the side facing the lock front 1 above the head section 7 the step up lever 27 is continued by a bend 29 which extends up to the rear of the lock and has a closure engagement opening 30 for the entrance of the closure member 6 39 the.