Locking device with associated key and blocking rib sensing

#This application claims the benefit of German application DE 102009044207.3-15 filed Oct. 8, 2009 which is incorporated by reference herein.

#The invention relates to a locking device having a lock cylinder and a matching key; the key having a key bit with at least one coding notch cut in, in particular on the front, and a blocking rib that runs in the direction of extent of the key bit and has at least one blocking rib indentation; the lock cylinder having a housing with a bearing bore and a cylinder core that is mounted in the bearing bore and has a keyway for insertion of a key, the cylinder core being blocked against rotation, when a key is not inserted, by at least one housing pin mounted in a housing hole; the housing pin projecting into a core hole of the cylinder core in which a core pin is fitted, and the housing pin being able to be brought into a release position enabling rotation of the cylinder core by entry of the core pin into the coding notch of the key inserted into the keyway; and the locking device having a blocking member for sensing the blocking rib indentation, the blocking member engaging, when a blocking rib indentation is not present, in a blocking recess of the bearing bore and preventing rotation of the cylinder core.

#EP 0 851 079 A1 describes a lock cylinder having a cylinder core into the keyway of which a flat key can be inserted, the key having a blocking rib which can be sensed by an inverted pin. The inverted pin disposed in the cylinder core interacts with a counter-pin disposed in the cylinder housing, so that the cylinder core is blocked against rotation by this blocking device when the height of the rib is less or greater than the proper rib height. The rib is here sensed on its side wall.

#An exemplary embodiment of the invention is explained below with reference to accompanying drawings, in which:

#FIG. 1 shows in plan view, partially in section, a locking cylinder with key inserted;

#FIG. 2 shows a section on the line II-II through an accommodating chamber 23, in which a pivot lever 18 is fitted;

#The key illustrated in FIGS. 4 to 6 has a bow and a key bit 2 that extends from the bow of the key 1 and can be inserted into a keyway 12 of a cylinder core 11. The locking bit 2 has a narrow key spine and two broad side surfaces of the key that run substantially parallel to one another. The front of the key, opposite from the key spine, is provided with coding notches 4, these being cut-in on the edge.

#On one broad side surface of the key bit 2, a blocking rib 3 runs in the direction of extent of the key bit 2, thus in the direction of insertion of the key 1. This blocking rib is directly adjacent the spine. The blocking rib 3 has a plurality of blocking rib indentations 5, which are formed by blind holes.

#The broad sides of the key bit 2 have in addition also a plurality of profile grooves 6 and profile grooves 7, which run parallel to one another and parallel to the blocking rib 3.