Locking device with a cylinder lock and a flat key
AssigneeR. Berchtold AG
InventorBenno Vonlanthen
Life of this patent
Estimating the term…
Abstract
The cylinder lock comprises blocking tumblers which are guided parallel to the broad sides of the key channel. On the broad sides (13, 14) of the flat key (2) guide grooves (15, 16) are disposed which cooperate with carriers on the blocking tumblers. The grooves (15, 16) on the key (2) comprise several function regions, wherein a subregion (51) of the groove comprises an expanded groove width. The tumblers whose carriers engage these expanded groove regions (51) are equipped with additional positioning elements. This configuration prevents the unauthorized opening of a lock according to the invention with a key (2) with duplicated guide grooves (15, 16).
Claims7
A locking device comprising:
- a cylinder lock (1) and a flat key (2);
- the cylinder lock (1) comprising a stator (4) and a rotor (3) with a longitudinal axis (7), the rotor being mounted for rotation in the stator (4) with a shear (40) line between the rotor and the stator;
- the rotor (3) having a key channel (6) with broad sides (8), a plurality of guides (11), a plurality of tumblers (10) each mounted in one of the guides and disposed substantially at right angles to the longitudinal axis (7) of the rotor (3) and parallel to the broad sides (8) of the key channel (6), each of the tumblers (10) having a carrier (12) which project into the key channel (6);
- the flat key (2) having a bit (21) with opposite sides (13,14), each of the opposite sides having at least one guide groove (15,16) for engaging the carriers of at least some of the tumblers when the key is inserted into the key channel (6), the at least one guide groove (15,16) on one of the opposite sides of the key bit having at least one free region (51), the free region having two side walls (22,23,24,25) and an expanded groove width so that with the key bit (21) inserted completely into the key channel (6) one of the carriers (12") is disposed in an unlocking position in the free region (51) and is out of contact with both said two side walls so that there is an interspace (47,48) between said one of the carriers (12") and the two side walls (22,23,24,25) in said free region;
- a permanent magnet (44,45) in the key bit;
- and
- a magnetic element (46) in one of said tumblers (18) which carries said one of the carriers in the free region, the magnetic element cooperating with the permanent magnet to form an additional positioning element (27) through which said one tumbler (18) which carries said one of the carriers, is positioned in the unlocking position that is free of contact with the side walls in said free region;
- the remaining carriers which are other than said one of the carriers that is in said free region, being in contact with the side walls (22,23,24,25) of said grooves (15,16) to form unlocking positions for the tumblers of said remaining carriers.
Dependencies are inferred from the claim text.