EP1333137B1 - Locking device - Google Patents

Description

The invention relates to a locking device with a lock cylinder and designed as a reversible key inner web flat key.

Such a closing device is for example from the DE 299 23 496 U1 known. This known device is a 4-track internal locking system. In this case, the lock cylinder comprises a cylinder housing and a rotatably mounted in the housing cylinder core, being arranged in the keyway of the cylinder core transversely to this from a locking position to an unlocking position spring-loaded frame-shaped tumblers (platelets). The frame-shaped tumblers are moved from their locking into their unlocked position by inserting the key bit of the flat key in the keyway, with a extending into the interior of the respective frame-shaped tumbler control cam is supported on a corresponding inner race (Stufenfräsbahn) of the key bit.

Such a closing device is further from the DE 299 22 264 U1 known, in which the key bit of the flat key protrudes slightly on the tip side about the Ansteuerschrägen the inner tracks of the flat key and each having one of the corresponding inner tracks opposite key edge, the front side has a key tip towards the starting slope.

A disadvantage has been found in this known locking device that when using Schließzylindem, in which the control cams of the frame-shaped tumblers in the locked position of the tumbler are relatively far shifted to the inner surface of the key channel, upon insertion of the corresponding flat key in the key channel at the Key front located control slope of the inner web no safe displacement of this control cam more effected, and the key can not be pushed further into the keyway of the cylinder core.

This disadvantage has meant that in known closing devices, the control cam tumblers must have a certain minimum distance from the inner wall of the keyway, resulting in a reduction of the maximum step depth (vertical distance of a step of an inner race of the key on which the control cam in the unlocked position of the corresponding tumbler rests) causes. This inevitably reduces the number of key combinations that are possible with the corresponding lock cylinder.

The invention has for its object to provide a locking device in which with the intended flat key, the tumblers are then actuated from its locking in its unlocked position when the control cam of the corresponding, located in its blocking position tumblers in the immediate vicinity of the wall portion of the key channel is.

This object is achieved by the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent claims.

The invention is based essentially on the idea of the tumbler whose control cam extends in the locked position to the immediate vicinity of the wall portion of the key channel, such that the control cam -in the direction of its Entriegelungsbewegung- opposite inner wall also projects into the keyway. In addition, the key bit of the flat key tip is slightly above the Ansteuerschräge the inner web, on which the control cam is supported, and has a this inner race opposite key edge on the front side directed towards the key tip run-on slope or a correspondingly rounded area, such that at Introducing the key bit in the key channel of the key edge first presses the tumbler laterally from the key channel, so that the control cam is simultaneously pressed into the keyway and the Ansteuerschräge the inner race can engage behind the control cam.

In a preferred embodiment of the invention, the closure device is a 4-web inner closure system in which the key bit of the flat key has on each of its broad sides an incision path which is defined in each case by two lateral, is limited in the direction of the longitudinal axis of the flat key extending inner webs. The two opposing key rims arranged in front of the control slopes of the inner webs in turn each have a run-on slope directed toward the key tip or a correspondingly rounded region.

In a further embodiment of the invention, the two inner webs of the 4-web inner closure system of a cutting path of the key bit on a parallel course, wherein the distance between the two inner webs corresponds approximately to the width of the control cam of the frame-shaped tumblers of the cylinder core, so that upon stirring the Schlüsselbartes in the keyway of the cylinder core, the control cam experience a double-sided positive guidance through the opposite inner webs of a slit sheet.

If a third party wants to open such a lock cylinder in an unauthorized manner with an opening tool, he must control the tumblers on all four lanes. This means that the thief needs an opening tool with the highest increment on the key tip on all 4 sides. However, in this system, since the step milling paths are overlapped (or very close to each other) from the upper side to the lower side, the opening for threading the control cams of the tumblers in the theft tool becomes too small. The theft tool can therefore no longer be introduced non-violently into the lock cylinder.

Moreover, when using one of the Stufenräsbahnen upstream key tip for pre-controlling the tumblers to note that also a theft tool must be designed to the full key width, resulting in a blockage of this tool when inserted into the keyway.

Since the positive control is greater than the Sperrkanaltiefe by the large increments of the tumblers, the locks must be sorted out according to these criteria. By this arrangement, the thief manipulation is made even more difficult for a thief, since he can then no longer penetrate with a similar key in the lock cylinder.

• Fig.1 den Längsschnitt durch einen Teil einer erfindungsgemäßen Schließvorrichtung mit einem Schließzylinder, in dessen Zylinderkern ein Flachschlüssel mit 4 Stufenfräsbahnen eingeführt ist;
• Fig.2 die in Fig. 1 dargestellte Schließvorrichtung ohne den Flachschlüssel;
• Fig.3 eine vergrößerte Ansicht der in Fig.1 mit 12 bezeichneten Zuhaltung, unmittelbar bevor die Schlüsselspitze die Zuhaltung von ihrer Sperrstellung in ihre entriegelte Stellung verschiebt, und
• Fig.4 die Fig.3 entsprechende Ansicht beim Einschieben eines Diebstahlwerkzeuges.

Further details and advantages of the invention will become apparent from the following with reference to figures explained embodiments. Show it:

• Fig.1 the longitudinal section through a portion of a locking device according to the invention with a lock cylinder, in the cylinder core, a flat key with 4 Stufenfräsbahnen is introduced;
• Fig.2 in the Fig. 1 illustrated locking device without the flat key;
• Figure 3 an enlarged view of the in Fig.1 with 12 designated tumbler, just before the key tip moves the tumbler from its locked position to its unlocked position, and
• Figure 4 the Figure 3 corresponding view when inserting a theft tool.

In Fig. 1 is denoted by 1 a closing device with a lock cylinder 2 and designed as a reversible key inner web flat key 3. The lock cylinder 2 comprises a cylinder housing 4 and a cylinder core 50 rotatably mounted in the housing 4.

In the keyway 60 of the cylinder core 50 are transverse to this of a in Fig.2 illustrated blocking position in a in Fig.1 illustrated unlocking position slidably arranged spring-loaded frame-shaped tumblers 5-12 provided (the structure of such tumbler is, for example, in the publication mentioned above DE 299 23 496 U1 disclosed in more detail). The tumblers 5, 6 and 9 and 10 engage with their lower wall portion in a lower locking groove 13 and the tumblers 7, 8 and 11, 12 with their upper wall portions in an upper locking groove 14 of the cylinder housing 4 a ( Fig.2 ).

The frame-shaped tumblers 5-12 are displaced by the insertion of the key bit 15 of the flat key 3 in the keyway 60 perpendicular to the longitudinal axis 16 of the cylinder core 50. For this purpose, a control cam 17-24 extending into the interior of the tumbler 5-12 is provided on each of the frame-shaped tumblers 5-12. Furthermore has the key bit 15 of the flat key 3 on each of its broadsides an incision path 25, each of which is bounded by two lateral, in the direction of the longitudinal axis of the flat key 3 inner webs (Stufenfräsbahn) 26, 27, where the control cam 17-24 of the tumblers Support 5-12.

Like the one in Fig.1 illustrated embodiment, there are based on the designated 17 and 21 control cams on the front lower inner panel 26, the designated 18 and 22 control cam on the rear lower inner track, the 19 and 23 designated control cam on the rear upper inner track and with 20 and 24 designated control cam on the front upper inner race 27 of the key blade 15 from.

The two inner webs 26, 27 of a sizing web 25 of the key bit 15 have a parallel course, the distance between the two inner webs about the width of the control cam 17-24 of the frame-shaped tumblers 5-12 of the cylinder core 50 corresponds, so that upon insertion of the Schlüsselbartes 15 in the keyway 60 of the cylinder core 50, the control cam 17-24 experience a double-sided positive guidance through the opposite inner webs 26, 27 of the two incision paths 25.

Like that Fig.2 and 3 it can be seen, the tumbler 12 is in its locked position so far moved to the inner surface 28 of the keyway 60 that when inserting the flat key 3 in the keyway 60 located in the tip-side region of the key bit 15 Ansteuerschräge 30 of the inner web 27 is not behind Control cam 24 and thus no displacement of the associated tumbler 12 more effected. In addition, the control cam 24 opposite inner wall 31 of the corresponding tumbler 12 protrudes in the locking position of the tumbler 12 also in the keyway 60 into it.

According to the invention it is therefore provided that the key bit 15 of the flat key 3 protrudes approximately on the drive slopes 29, 30 of the inner webs 26, 27 and one of the respective inner web 26, 27 opposite key edge 32, 33, the front side facing the key tip run-on slope 34th , 35 or has a correspondingly rounded area, such that upon insertion of the key bit 15 in the keyway 60 this in the case of the in the Fig.1-3 illustrated embodiment, first with the key edge 32, the inner wall 31 of the tumbler 12 from the keyway 60 laterally (down) pushes out, so that the 12 of this tumbler 12 associated control cam 24 is further pushed into the keyway 60 and the Ansteuerschräge 30 of the inner race 27, the control cam 24th can engage.

In Figure 4 Once again, the tumbler 12 is shown, to which now instead of a designated flat key 3, a commonly used theft tool 36 attacks. Clearly visible are the two cams 37, 38 which are arranged on the tip-side region of the theft tool 36 and which in each case correspond to the increment which occurs at the intended key 3. Since the Stufenräsbahnen 26, 27 at the in the Fig.1 However, 4-flat key 3 shown almost touching from the top to the bottom, the opening for threading the tumblers 5-12 in the theft tool 36 is relatively small, so that the corresponding control cam 17-24 can not be passed between the cams 37, 38 are. The theft tool 36 can therefore not be completely inserted into the keyway 60.

In addition, the tip-side lower portion of the theft tool 36 would abut against the protruding into the keyway 60 inner wall 31 of the tumbler 12 and could be inserted only partially for this reason in the keyway 60. Finally, the tumbler 12 would be pushed due to the height of the cam 37 in the lower locking groove 13 of the cylinder housing 4 and pressed there against the Sperrnutenwand 39, which would also lead to a blocking of the insertion movement of the theft tool 36.

LIST OF REFERENCE NUMBERS

1

closing device

2

lock cylinder

3

flat key

4

Cylinder housing, housing

5-12

tumblers

13

lower locking groove

14

upper locking groove

15

bit

16

Longitudinal axis (cylinder core)

17-24

control cam

25

nick Bahn

26, 27

Inner webs, step milling track

28

inner surface

29.30

Ansteuerschrägen

31

Inner wall (tumbler)

32.33

key edge

34.35

chamfers

36

theft tool

37.38

cam

39

Sperrnutenwand

50

cylinder core

60

keyway

Claims (3)

1. Locking device having a lock cylinder (2) and a flat key (3) which has inside tracks and is designed as a turning key, the locking device having the following features:

   a) the lock cylinder (2) comprises a cylinder housing (4) and a cylinder core (50) mounted in a rotatable manner in the housing (4);

   b) the key channel (60) of the cylinder core (50) has arranged in it frame-like tumblers (5-12) which are spring-loaded such that they can be displaced, transversally to this key channel of the cylinder core, from a locking position into an unlocking position;

   c) the frame-like tumblers (5-12) can be displaced from their locking position into the unlocking position by virtue of the bit (15) of the flat key (3) being pushed into the key channel (60), wherein a cam (17-24) which extends into the interior of the respective frame-like tumbler (5-12) is supported on a corresponding inside track (26, 27) of the key bit (15);

   d) the cam (24) of at least one of the frame-like tumblers (12), in the locking position of the tumbler (12), has been displaced in the direction of the inner surface (28) of the key channel (60) to such an extent that, when the associated flat key (3) is pushed into the key channel (60), it is no longer the case that the activating slope (30) of the inside track (27), this slope being located in the region of the tip of the flat key (3), gives rise to any rear engagement of the cam or therefore to any displacement of this cam (24);

   e) the frame-like tumbler (12), which is assigned to this cam (24), is configured such that the inner wall (31) of the tumbler (12), this inner wall being located opposite the cam (24), likewise projects into the key channel (60) in the locking position of this tumbler;

   f) the bit (15) of the flat key (3) projects, at the tip, some way beyond the activating slopes (29, 30) of the inside tracks (26, 27) and has in each case a key periphery (32, 33) which is located opposite the corresponding inside track (26, 27) and has, at the front, a run-on slope (34, 35), which is directed towards the tip of the key, or a correspondingly rounded region such that, when the key bit (15) is introduced into the key channel (60), it forces, in the first instance by way of the key periphery (32, 33), the inner wall (31) of the tumbler (12) laterally out of the key channel (60), in which case the cam (24), which is assigned to this tumbler (12), is forced further into the key channel (60) and the activating slope (30) of the inside track (27) can engage behind the cam (24).
2. Locking device according to Claim 1, characterized in that the locking device (1) is a four-track internal locking system in which the bit (15) of the flat key (3), on each of its broad sides, has a recessed track (25) which is bounded in each case by two lateral inside tracks (26, 27) extending in the direction of the longitudinal axis of the flat key (3), and in that the two opposite key peripheries (32, 33), which are arranged at the tip in front of the activating slopes (29, 30) of the inside tracks (26, 27), each have a run-on slope (34, 35), which is directed towards the tip of the key, or a correspondingly rounded region.
3. Locking device according to Claim 2, characterized in that the two inside tracks (26, 27) of a recessed track (25) of the key bit (15) have profiles which are directed parallel to one another, and in that the distance between the two inside tracks corresponds approximately to the width of the cams (17-24) of the frame-like tumblers (5-12) of the cylinder core (50), in which case, when the key bit (15) is introduced into the key channel (60) of the cylinder core (50), the cams (17-24) are subjected to positive guidance on both sides by the opposite inside tracks (26, 27) of a recessed track (25).

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