Lock cylinder

(42) Date of commencement of the patent: 15. 6.1991 (45) Date of issue: 25.11.1993 (56) References:

AT-PS 363337 EP-PS0255986 FR-PS2589925 GB-PS2118620 IIS-PS4270372 US-PS3264852 (54) LOCKING CYLINDER (57) A lock cylinder with a cylinder core (2) which is rotatably mounted in a housing (1) has a keyway (6 , 6 *) with profile ribs and profile grooves which enclose an angle relative to the axis of rotation (7, 7 *) of the cylinder core (2, 2 *). The obliquely profiled keyway (6, 6 ') is continued in the interior of the lock cylinder by a groove (11) in the cylinder housing (1) above the cylinder core (2). In the obliquely profiled key channel (6,6 *), as is known, engage divided tumbler pins (3), which can be pushed into the release position by the fitting key (5,5 *); The back (9) of the flat key (5) is at an angle to the present on the key and the keyway (6,6 *) complementary profile ribs and grooves.

(73) Patent owner:

GEBR.GRUNDMANN SOCIETY MBH

A-3130 HERZOGENBURG, LOWER AUSTRIA (AT).

<img file="AT396706B_D0001.tif" />

CD

AT 396 706

H®OT7aaia

The invention relates to a lock cylinder with a housing in which a Zylinderkem is rotatably mounted, wherein the Zylinderkem a keyway, in particular for insertion of a flat key, having provided in the housing and cylinder core bores for spring-loaded, split tumbler pins, wherein the Key channel and / or are bounded by the key channel limiting profile ribs and profile grooves to the axis of rotation of the cylinder core in the insertion direction of the key at an angle of, for example, 2 ° rising, in which the geometric axes of the holes on Zuhaltestifte perpendicular to the direction of the axis of rotation of the cylinder core or perpendicular za direction of the keyway and or. or za direction of the key channel limiting profile ribs and profile grooves run, and a flat key for such a lock cylinder.

Due to the profile design of the key channel is achieved that na key blanks, which have the corresponding cross-sectional profile, be used for the production of suitable "keys". The key channel profile is one of the security criteria for the selective assignment between key and lock. As the key catalogs show, the number of profiles used today is very large. With the modern milling and Räumverfahr "very" complicated profile shapes can be produced.

From EP-Al 255 986 it is known to provide the profiling of the side surfaces of a flat key in a key-lock combination at an angle different from 0 ° to the axially aligned key back. As a result of an equally oblique cylinder core profiling in the key channel, the key is forced to move in the vertical direction when inserted. This makes it more difficult to produce secondary keys

The invention aims to provide a lock cylinder of the type described above in such a way that even with the simplest profile sections usual (possibly commercial) key excluded werd «and thus a particularly high degree of security but also to a variety of variations is achieved.

This object is achieved in that the key channel in the end beyond the Zylinderkem out in the housing in the form of a "vahand in the housing" groove continued, the "back" in the housing ut protrude lock the rotation of the cylinder core, even then if all other blocking criteria are met. Well then, if the key back is exactly in the cylinder surface of the core can be blocked.

A flat key for a "such lock cylinder is characterized in that the Schliisselrück" to since provided on the flat sides axially aligned profile grooves and profile ribs za key tip sloping down angle, for example, includes 2 ° The key back protrudes due to his «slope not in the housing groove above of the key channel. If one pushes this key into an associated lock, the key back is only fully inserted into the cylinder surface of the cylinder core. If the position of the key back is not exactly correct, for example due to a key height that is a little too large, then the part projecting into the housing groove blocks the rotation of the cylinder core. If the angle of the key back is not correct or if the key height is too low, the tumblers snap into the core when rotated by 180 ° because the keychain is not completely and flush with the cylindrical surface of the cylinder core due to the key The tumbler pins resp , one of them catches the core during the turn. If an attempt is made to insert a currently commercially available key whose cross section coincides with the entry cross section of the key channel into a key channel of a lock according to the invention, then this normal key can be inserted, but its key back lies in the housing mentioned there and thereby blocks any rotation of the key cylinder core.

If the height of the keyway of the untoothed blank is less than the height of the keyway in the entry area in the cylinder core, then the width of the keyway in the rear axle must be smaller than the head diameter of the housing pins so that they do not engage in the remaining keyway. Embodiments of the subject invention are dagestellt in the drawing

2 shows a front view of the lock cylinder according to FIG. 1, FIG. 3 shows a "key for such a" lock cylinder, FIG. 4 shows a variant of the lock, FIG. 1, simplified, without tumbler pins, and FIG. 5 shows a variant of the key for the lock cylinder according to FIG. 1 or FIG. 4.

A lock cylinder according to FIG. 1 and 2 comprises in a conventional manner a housing (1) in which a Zylinderkem (2) is rotatably mounted Split tumbler pins (3), namely Kem- and housing pins are in bore «(4) in the core and in the housing against spring force by means of a Key (5) (Fig. 3) displaceable. A keyway (6) is provided in the cylinder core (2), since the axis of rotation (7) of the cylinder core (2) is inclined at an angle or Thus, the profile ribs and the profile grooves do not run as previously in the rotation axis direction (7), but at an angle to this ". Since key (5) according to FIG. 3 has in Bartbercich (8) on that profile, the key channel (6) speaks at its lowest channel height « Complementary to this is shown in FIG. 1 this profile is at the inner end of the keyway (6). The Schlüsselrück «(9) extends at an angle to the profile grooves or Ribbing of the key bit, which corresponds to the angle of the key channel (6) za axis of rotation (7) By the key tip and the funnel-shaped countersink on the cylinder core (6) the key is ziert and can be inserted like any "standard key". The spine (9) lies paallei za axis of rotation (7) and shifts with increasing «the

-2AT396706B

Push in until the back of the key (9) finally aligns with the cylinder surface of the cylinder core (6) and the keyway is completely filled upwards. The Bartzahnung (10) moves the contact surfaces of the pin tumblers (3) in the dividing surface between the cylinder core and housing, so that the lock cylinder can be actuated.

If a standard key is used, it has a key back (9 ') that runs parallel to the profile ribs and profile grooves of the key (shown in dashed lines). In a particular embodiment, the housing (1) above the key channel (6) has a groove, for example in the form of a keyway (11). If said standard key is plugged in, the dashed part of the key bit (8) slides into the keyway (11). Even if the profile and the teeth are suitable, then still can not be locked because there in da groove (11) lying part of the key bit (8) prevents rotation of the Zylindakems (2).

In Fig. 1 are the holes (4) for the tumbler pins (3) orthogonal to the axis of rotation (7) of the cylinder core (2). According to FIG. 4 these holes (4 *) in the housing (1 ') and in the cylinder core (2 *) are perpendicular to the direction of the key channel (6'). The key (5 *) can also be formed with a parallel to the profile grooves and ribs back (9), the total height of the key bit then throughout the measure of the smallest height of the key channel (6), (6 *) corresponds However, puffs in this Execution between key back (9) and cylinder core surface in the keyway (6), (6 ') a wedge-shaped valaufender gap or a groove with inserted key (5 *) unfilled so that the key back (9) is not completely aligned with the cylinder core surface. This must be taken into account in da dimensions of the head portion of the housing pins of the tumblers (3) so that they do not engage in the keyway and the rotation of the cylinder core about its axis (7) or (7 ') block.

If the guide profile of the flat key is located in the middle third of the beard cross section then a particularly precise guidance is ensured because during the insertion of a key in the key channel a centrally disposed guide profile engages faster than a lying in the key back. To cover the Kemstifte in their head area against Abtastwakzeuge the central guide profile may have two oda more overlapping (overlapping) profile ribs ..