EP4204648B1 - Flat key for a cylinder lock - Google Patents

Description

The present invention relates to a flat key for a locking cylinder, in particular of locking systems, with essentially flat and approximately parallel flat sides, a key back and a key face opposite this, toothed on the front side, for positioning tumbler pins divided into core pins and housing pins, which are in corresponding key channels Cylinder cores are spring-loaded against the key chest in the direction of the key back, with grooves cut into the flat sides of the flat key being provided as variation profile elements and as guide profile elements, with at least two grooves on a flat side of the flat key overlapping and being undercut in opposite directions. It further relates to a blank that is suitable for producing such a flat key, a method for producing such a blank and a lock cylinder for such a flat key.

There should be a clear association between key and lock. With simple locks that are not part of a locking system, each key should only lock “its” assigned lock. With locking systems, however, the assignment is not clear, there are hierarchies: the entrance gate should usually be able to be locked with all keys, but a room can often only be locked with a single key. On the other hand, the cleaning staff should have a key that locks all the locks so that they can clean all the rooms. This assignment of keys and locks or the exclusion of certain keys from certain locks is achieved, among other things, by the cross-sectional profile of the keys and the cross-section of the key channels. The key will only fit into the lock if the contour of a key channel cross-section corresponds to or encloses a flat key cross-section. As soon as the contour of the flat key cross-section intersects that of the key channel cross-section, the key has no locking authorization with regard to the aforementioned locking cylinder.

Basically, such flat keys have a guide profile and a variation profile. The guide profile is always the same for a series of keys and is manufactured with very small tolerances so that the key is guided precisely in the key channel. The variation profile varies from key to key and is intended to prevent an unauthorized key from being introduced into a key channel. The tolerances can be larger here.

This assignment between key and locking cylinder via the profile applies to the individual cylinder and the individual key, which is not directly part of a locking system, as well as to locking systems.

A blank for a flat key only has the grooves of the guide profile; The variation profile and the teeth of the key face are subsequently milled into such a blank. As mentioned, the guide profile should only have very small tolerances, which is why it should not be milled on the copy milling machine, but rather a correspondingly precise, prefabricated blank should be used. The less precise copy milling machine should only be used for milling the teeth of the key face and the variation profile.

It meets the need for security if a key cannot be easily copied. The authorized person can obtain a replacement key from the original manufacturer using security certificates and strict identity checks. If key blanks are commercially available, a locksmith can easily produce a replacement key using a copy milling device by making a serration on the key face. If a copy milling device is also able to scan a cross-sectional profile on the flat sides of an original key and appropriate milling tools are available, a replacement key can also be machined from a metal plate be worked out. So if the production of replacement keys for blocked key profiles was previously not possible due to the lack of a corresponding blank due to the restriction of free access on the market, the technical possibilities for locksmith services have been available for a long time to produce copies of a key both in terms of the teeth and in terms of the to create a profile. A key profile is scanned mechanically or optically from the side. The result of this lateral scanning is followed by the grooving or feeding of one or more milling cutters to produce U-shaped, V-shaped or rectangular grooves. By tilting the key blank, grooves can also be produced at an angle to the longitudinal center plane of the profile cross section, for example as undercut grooves. As mentioned, such keys are inferior due to their lower precision, but they usually still lock.

A flat key of the type mentioned at the beginning is out WO 2012/088562 A2 known. According to this document, two overlapping, oppositely undercut grooves were provided, with the middle of the groove base - viewed in the direction normal to the longitudinal center plane of the key - being covered by these undercuts in at least one groove. The idea behind it was as follows: If the bottom of the groove is at least partially covered, it is particularly difficult to determine the exact data of the groove (depth, width, angle, position). The edge resulting from the intersection of the two grooves can be scanned in the locking cylinder. However, this edge cannot be created directly by the locksmith, but is created by the intersection of the two grooves. If the data of at least one groove cannot be recorded accurately, this edge is not in the intended location and the key does not lock.

There are now laser scanners, and with these it is easy to capture the exact contour of even undercut grooves, so that such keys are now relatively easy to copy.

Now you can think of complicated grooves, such as in Fig. 15 of US 2011/0056258 A1 is shown. The problem, however, is that such keys cannot be produced by milling, such profiles have to be cleared, and broaching is considerably more complex and therefore more expensive than milling. In addition, keys with such a profile must be significantly thicker than is currently common in Central Europe, i.e. significantly thicker than the maximum of 2.8 mm that is common in Central Europe.

It is the object of the present invention to improve a flat key of the type mentioned in such a way that the cross-sectional profile cannot be completely captured even when using a laser scanner, but the key should still be able to be produced by milling, i.e. relatively inexpensively, and it should It will also be possible to realize the profile in a key of the conventional thickness of 2.8 mm.

These tasks are achieved according to the invention by a flat key of the type mentioned or by a blank for such a flat key in that a recess is provided in the outer flank of at least one of the two grooves, and that at least an area of the recess cannot be seen from the side is. So that a key copy cannot be inserted into the lock cylinder without such a recess, a lock cylinder according to the invention provides that an elevation is provided in the outer flank of at least one of the two ribs.

Was it at the priority time? WO 2012/088562 A2 It was still sufficient that the groove base of at least one groove was not visible in a direction normal to the longitudinal center plane in order to allow copying To make it so complex that most locksmiths never even tried, this is no longer enough due to the laser scanners that are readily available today. It is necessary that at least one part of the groove base cannot be seen from the side at all. For this reason, an additional deepening is provided.

It is advantageous if the two grooves including the recess(s) are already provided in the blank, i.e. are part of the guide profile, because then they have to be copied with high precision if you want to produce a problem-free locking key. As explained above, a guide profile has very tight tolerances. If you now copy the key in such a way that you simply mill away a larger area around the grooves without paying attention to the exact contour, the key will no longer be guided precisely and it will "hook". Such inferior keys cast a bad light on the locking cylinder or the entire locking system, and according to the highest court rulings, this represents unfair competition. For competition law reasons, the management profile must be copied exactly in order not to devalue the entire locking system.

It is in accordance with the WO 2012/088562 A2 expedient if, in addition to the two undercut grooves in opposite directions, a further groove is provided on the opposite flat side, which overlaps with at least one of the two undercut grooves in opposite directions, the two undercut grooves and the further groove preferably being arranged in the central region of the two flat sides. On the one hand, the overlap makes it more difficult to insert lock picking tools, and on the other hand, it causes the key to lose its mechanical stability if the guide profile is milled larger than intended by the key manufacturer. In addition to the fact that such a key gets stuck, it also bends easily and therefore easily becomes completely unusable. In the associated locking cylinder it is therefore provided that in addition to the two oppositely undercut ribs on the opposite one A further rib is provided on the flat side, which overlaps with at least one of the two undercut ribs in opposite directions, the two undercut ribs and the further rib preferably being arranged in the central region of the two flat sides, where the head ends of the core pins lie. When the ribs are arranged in the middle area, they cover the core pins in the key channel on the head side, making scanning with lock picking tools more difficult.

Such a flat key is particularly difficult to copy if the two undercut angles of the undercut grooves are of different sizes. In this way you cannot close from one undercut groove to the other.

It is particularly advantageous if a recess is provided in the outer flank of both grooves, the two recesses preferably being symmetrical, the axis of symmetry lying in the open area of the two overlapping grooves, in particular in such a way that they can be cut with a T-slot milling cutter can be produced.

In this embodiment, it is further provided that the two recesses are symmetrical to one another and the axis of symmetry (corresponding to the shaft of the T-slot milling cutter) lies in the open area of the two overlapping grooves.

Accordingly, an elevation is provided on the outer flanks of both ribs in the associated locking cylinder, the two elevations preferably being symmetrical.

It is expedient that the axis of symmetry of the two recesses is at an oblique angle to the longitudinal center plane of the flat key or the blank. In this way you cannot draw conclusions from one depression to the other. Correspondingly For the associated locking cylinder, it is provided that the axis of symmetry is at an oblique angle to the longitudinal center plane of the key channel.

Finally, it is favorable if the depression or depressions are designed like a groove with a round base. This makes it even more difficult to recognize the exact contour. In the associated locking cylinder, the elevation or elevations are then rounded on the outside.

In order to produce a key blank for such flat keys, it is advisable to first produce the two undercut grooves and then mill a recess in at least one of the two undercut grooves using a T-slot milling cutter. In this way, no broaching tools are necessary to produce the recess.

It is particularly useful if you use the T-slot cutter to mill a recess in both undercut grooves at the same time. This not only saves a work step, but also means that the radial forces on the T-slot cutter are reduced.

Finally, it is useful if the T-slot cutter is guided at an acute or obtuse angle to the longitudinal center plane of the blank. This creates an additional "degree of freedom" that must be determined when copying the key. If the T-slot cutter were positioned exactly at right angles to the longitudinal center plane of the blank, determining the geometry of the grooves would be easier.

The present invention is explained in more detail using the accompanying drawings. It shows: Fig. 1a to 1d a blank in four different views; Fig. 2 a cross section through this blank in the direction of arrow II in Fig. 1c ; Fig. 2a an enlarged section Fig. 2; Fig. 3 an analogous cross section through a flat key made from this blank, that is in the direction of arrow III in Fig. 4c; Fig. 4a to 4d the in Fig. 3 flat key shown in section shows the finished flat key according to the invention in four different views; Fig. 5 A lock cylinder associated with this flat key in a perspective view; Fig. 6 the same from the front, namely a cutout around the cylinder core; Fig. 7 a threefold enlargement of a section Fig. 6 ; Fig. 8 the production of a blank according to the invention in accordance with Figs. 1a-1d and 2 ; Fig. 9 a (partial) longitudinal section through a locking cylinder according to Fig. 5 to 7 without flat key; and Fig. 10 a (partial) longitudinal section through this locking cylinder with a flat key inserted into the key channel.

Fig. 1a to 1d and 2 show a blank 1b with a key 1' with which it can be held. The blank 1b has, next to the key blade 1', the key bit, which has a key back 4 at the top, a key face 5 at the bottom and two flat sides 2', 3' in between. In the in Fig. 2 Two grooves 11', 12' are provided on the right flat side 3'. These overlap and are undercut in opposite directions, so that there are two outer flanks 11a ', 12a', which face away from the other groove 12', 11', and two inner flanks 11b', 12b', which face the other groove 12', 11' are facing. The outer flanks 11a', 12a' are angled; the reason for this will be explained by Fig. 8 be explained.

The intersection of the two grooves 11', 12' results in an edge B that can be scanned with a tumbler pin. Thus, a key copy which, instead of the two grooves 11', 12', has a large rectangular groove which encloses both grooves 11', 12', does not lock, although it can be inserted into the key channel. You can also scan point A with a tumbler pin. This is from the one mentioned above WO 2012/088562 A2 known, and these options are retained in the flat key according to the invention.

On the opposite, in Fig. 2 A further groove 13' is provided on the left flat side 2', and a further groove 14' is provided on the flat side 3' below the two overlapping grooves 11' and 12'. The grooves 11', 12', 13' and 14' form the guide profile. They are present in all flat keys in this series as they are already provided in blank 1b. The grooves of the guide profile are used to precisely guide the flat key in the key channel of the locking cylinder, so they have particularly low tolerances.

According to the invention, two additional recesses 15' and 16' are now provided in this blank 1b, which is known in principle, namely in the outer flanks 11a' and 12a' of the grooves 11' and 12'. This can be done with a T-slot cutter 60 (see Fig. 8 ) mill. These additional depressions 15', 16' are located in the flanks 11a', 12a' and are therefore at a distance from the groove base (not known from the outset). It is particularly favorable if the T-slot cutter 60 is at an angle, i.e. the cutter axis 61 is not at a right angle to the longitudinal center plane 6 '. In this way the axis of symmetry 62 stands (see Fig. 2a ) of the two recesses 15', 16' at an oblique angle to the longitudinal center plane 6' of the blank 1b. If the two undercut angles α, β of the two grooves 11', 12' are different, one cannot draw conclusions from one groove 11' to the other groove 12'. Overall, measuring such a flat key is extremely complex.

In Fig. 2a The theoretical sight lines 15a and 16a are also shown. In practice, a laser scanner has a certain extent, so it cannot be brought as close as desired to the flat side 3 '. But even if it could be brought as close as desired according to the theoretical lines of sight 15a and 16a, there would still be areas 15b, 16b that cannot be seen and therefore cannot be captured.

A T-slot cutter with a relatively thin shank (e.g. 1 mm) has a shorter service life than a cutter 60 (see Fig. 8 ) with a thicker shaft 61 of, for example, 1.3 mm. For this reason, the flanks 11a', 12a' are angled; they have bends 11b', 12b'. These bends 11b', 12b' widen the opening resulting from the two grooves 11', 12', so that more space is available for the shaft 61 of the milling cutter 60. These bends 11b', 12b' can also be produced by milling.

A flat key 1 made from such a blank (see Fig. 3 ) differs in cross section from blank 1b (see Fig. 2 ) through additional variation profile grooves 20', 21', 22', 23', 24' and 25'. These can be different for each flat key 1, so that not every flat key 1 can be inserted into every lock cylinder, depending on the contour of the cross section of the flat key and the key channel in the lock cylinder. Since the variation profile only serves to prevent flat keys 1 from being inserted into locking cylinders for which they are not authorized to lock, they can be manufactured with less precision. So only the blanks 1b have to be manufactured precisely.

The flat keys 1 also differ (see Fig. 4a to 4d ) from blank 1b (see Fig. 1a to 1d ) by having 5 serrations 41, 42, 43, 44, 45 and 46 on the key face (see Fig. 4b ) exhibit. The number is not specified; for example, five or seven tooth millings can be provided. These tooth millings 41 to 46 are generally different for two different flat keys 1.

An associated lock cylinder 100 is in Fig. 5 seen in perspective view. It has a housing 101 in which a cylinder core 102 is inserted. This cylinder core 102 has a key channel 103. If a corresponding flat key is inserted into the key channel 103, the cylinder core 102 is coupled to a locking lug 104 (as shown below Fig. 7 is explained). If you now turn the flat key, you twist it Cylinder core 102 together with the locking lug 104, so that the locking lug 104 can operate a corresponding element (eg a locking bolt or a push rod) of a lock. To fix the lock cylinder 100 in the lock, a threaded hole 105 is provided, into which a long screw 105 'can be screwed from the outside of the lock.

In Fig. 5 only a cylinder core 102 is visible. Opposite the locking lug 104 (ie in the rear area of the locking cylinder 100, as in Fig. 1 seen), however, there is another cylinder core so that the locking cylinder 100 can be locked from both sides of a door. It is a so-called double locking cylinder. However, the present invention can also be implemented with a single locking cylinder.

In Fig. 6 and 7 In particular, the key channel 103 can be seen, which corresponds to the cross section of the flat key 1 (see Fig. 3 ) has complementary form, as shown by Fig. 7 is explained in more detail.

In particular, there are corresponding ribs 11, 12, 13 and 14 for all grooves of the guide profile of the flat key in the flat sides 2 and 3 of the key channel 103 (see Fig. 7 ) available. The rib 13 overlaps at least with the rib 11, which makes scanning the tumbler pins in the lock cylinder 100 more difficult, since you cannot penetrate the key channel 103 with a flat plate. Corresponding ribs are also present for the grooves of the variation profile, although these are not provided with reference numbers to improve clarity. It is important that elevations 15 and 16 are provided on the ribs 11 and 12, which correspond to the depressions 15 'and 16' of the flat key 1 (see Fig. 3 ) are equivalent to. As a result, a flat key in which these recesses 15 ', 16' are missing cannot be inserted into the key channel 103; it collides with the elevations 15, 16.

An advantage of these new keys 1 is that they can also be inserted into locking cylinders in which the elevations 15, 16 are missing. That is, in the case of an existing locking system according to the state of the art, it is sufficient to provide all existing flat keys with the additional recesses 15 ', 16' and, for example, to only equip the entrance doors with new locking cylinders, which are in the places corresponding to the recesses 15 ', 16' Have surveys 15, 16 to prevent the new keys from being copied. The old flat keys or poor copies of the new flat keys cannot then be inserted into the key channel 103 of the new locking cylinders 100 of the entrance doors and are therefore worthless.

So that not just any flat key that goes into the key channel 103 (see 5 and 6 ) fits, locks the lock cylinder 100, so-called tumbler pins are provided, as shown by 9 and 10 is explained.

In Fig. 9 You can again see the housing 101, the cylinder core 102 with key channel 103, the locking lug 104 and the threaded hole 105. You can also see a coupling piece 106, which is connected to a flat key 1 by means of a short push rod 107 (see Fig. 10 ) was inserted into the locking lug 104, so that the locking lug 104 is coupled to the cylinder core 102. If you insert a flat key into the other cylinder core (not shown), the opposite coupling piece is pushed into the locking lug 104 and this other cylinder core is thus coupled to the locking lug 104; The coupling piece 106 is thereby automatically pushed out of the locking lug 104, so that the cylinder core 102 is decoupled.

How to get out Fig. 9 Furthermore, six holes are provided in the housing 101, which continue from the housing 101 into the cylinder core 102 into the key channel 103. There are holes in these Tumbler pins are used, which are composed of housing pin 111 and core pin 112. The bores are closed at the bottom by plugs 114, and the tumbler pins are biased upwards by springs 113, which are supported on the plugs 114. The reference numbers 111 to 114 are only entered for the front bore. Housing pins, core pins, springs and plugs are also provided in the other five holes. In the second hole from the front (from the left, as in Fig. 4 seen) the housing pin is designated 111' and the core pin is designated 112'. A special feature can be seen here: the tumbler pin is divided into three parts, between the housing pin 111 'and the core pin 112' there is an intermediate piece 115, the meaning of which is based on Fig. 10 will be explained.

How to get out Fig. 9 As you can see, the housing pins 111 - if no flat key is inserted - extend into the cylinder core 102. They thus prevent the cylinder core 102 from being twisted.

If a suitable flat key 1 is now inserted (see Fig. 10 ), this presses the core pins 112 downwards with its teeth, to such an extent that the dividing plane between the core pin 112 and the housing pin 111 lies on the interface between the cylinder core 102 and the housing 101 for all tumbler pins. The cylinder core 102 can thus be rotated, taking the locking lug 104 with it. The key locks. So that the cylinder core 102 cannot be pulled out of the housing 101 in this situation, a snap ring 108 (see Fig. 4 ) is provided, which engages in a slot in the housing 101 and in a groove in the cylinder core 102 and thus axially secures the cylinder core 102.

If even one tooth milling was too deep or not deep enough, the housing pin 111 or the core pin 112 would prevent rotation.

An exception is the second tumbler pin with the intermediate piece 115. As a result of the intermediate piece 115, the one shown here locks Locking cylinder 100 flat key with two different teeth: if the second tooth milling is deeper by the height of the intermediate piece 115 than in the example shown, instead of the dividing plane between the core pin 112 'and the intermediate piece 115, the dividing plane between the intermediate piece 115 and the housing pin 111' comes at the interface between the cylinder core 102 and housing 101, and this flat key also locks. This is used in locking systems where, for example, a locking cylinder is to be locked by a key that only fits this locking cylinder and by a master key. In more complicated locking systems, such intermediate pieces 115 can of course be provided for several tumbler pins or even for all tumbler pins.

In Fig. 6 and 7 You can see some parts of the lock cylinder in the background in the key channel 103, shown with thin lines. In Fig. 7 these parts are provided with reference numbers. Specifically, you can see the core pin 112, the core pin 112 ', the push rod 107 and the snap ring 108.

Claims (20)

1. A flat key (1) for a locking cylinder (100), in particular for locking systems, having substantially flat and approximately parallel flat key sides (2', 3'), a key rear section (4), and a key front section (5) opposite thereto, toothed on the end face, for positioning tumbler pins divided into core pins (112) and housing pins (111), which are spring-loaded in corresponding key channels (103) of cylinder cores (101) against the key front section (5) in the direction of the key rear section (4), wherein grooves (11', 12', 13', 14', 20' - 25') in the form of profiled variation elements and profiled guiding elements are provided in the flat sides (2', 3') of the flat key (1), wherein at least two grooves (11', 12') of one flat side (3') of the flat key (1) overlap and are undercut in opposite directions, characterized in that a depression (15', 16') is provided in the outer flank (11 a', 12a') of at least one of the two grooves (11', 12'), and in that at least one region (15b, 16b) of said depression (15', 16') is not visible from the side.
2. A key blank (1b) for a flat key (1) for a locking cylinder (100), in particular for locking systems, having substantially flat and approximately parallel flat key sides (2', 3'), a key rear section (4), and a key front section (5), wherein grooves (11', 12', 13', 14') in the form of profiled guiding elements are provided in the flat sides (2', 3') of the key blank (1b), wherein at least two grooves (11', 12') of one side (3') of the key blank (1b) overlap and are undercut in opposite directions, characterized in that a depression (15', 16') is provided in the outer flank (11a', 12a') of at least one of the two grooves (11', 12'), and in that at least one region (15b, 16b) of said depression (15', 16') is not visible from the outside.
3. The flat key or key blank according to claim 1 or 2, characterized in that in addition to the two oppositely undercut grooves (11', 12'), a further groove (13') is provided on the opposite flat side, which overlaps with at least one of the two oppositely undercut grooves (11', 12').
4. The flat key or key blank according to claim 3, characterized in that the two undercut grooves (11', 12') and the further groove (13') are arranged in the central region of the two flat sides.
5. The flat key or key blank according to any one of claims 1 to 4, characterized in that the two undercut angles (α, ß) of the undercut grooves (11', 12') are different sizes.
6. The flat key or key blank according to any one of claims 1 to 5, characterized in that a depression (15', 16') is provided in the outer flank (11a', 12a') of both grooves (11', 12').
7. The flat key or key blank according to claim 6, characterized in that the two recesses (15', 16') are symmetrical, wherein the axis of symmetry (19) lies in the open area of the two overlapping grooves (11', 12'), in particular in such a way that they can be produced with a T-slot milling cutter (60).
8. The flat key or key blank according to claim 7, characterized in that the axis of symmetry (62) of the two recesses (15', 16') is at an oblique angle to the longitudinal center plane (6') of the flat key (1) or the blank (1b).
9. The flat key or key blank according to any one of claims 1 to 8, characterized in that the recess(es) (15', 16') are designed like a groove with a round base.
10. A method for producing a key blank according to any one of claims 2 to 9, characterized in that the two undercut grooves (11', 12') are first produced and then a recess (15', 16') is milled into at least one of the two undercut grooves (11', 12') using a T-slot milling cutter (60).
11. The method according to claim 10 for a flat key according to claim 6 or 7 and optionally 8, characterized in that a recess (15', 16') is milled simultaneously in each of the two undercut grooves (11', 12') using the T-slot milling cutter (60).
12. The method according to claim 10 or 11, characterized in that the T-slot milling cutter (60) is guided at an acute or obtuse angle to the longitudinal center plane (6') of the blank.
13. A locking cylinder (100) having a housing (101) and a cylinder core (102) which can be rotated in the housing (101), wherein a key channel (103) with two flat sides (2, 3) for inserting a suitable flat key (1) according to claim 1 is provided in the cylinder core (102); wherein bores are provided in the housing (101) which, in the initial position of the cylinder core (102), continue in alignment in the cylinder core (102) into the key channel (103), wherein tumbler pins subdivided into core pins (112) and housing pins (111) are provided in these bores, which are positioned by the serration cutouts (41, 42, 43, 44, 45, 46) of the matching flat key (1) such that the pitch plane between the core pin (112) and the housing pin (111) of each tumbler pin lies at the edge of the cylinder core (102), so that the cylinder core (102) can be rotated with the matching flat key (1); wherein ribs (11, 12, 13, 14) are provided in the flat sides (2, 3) as profiled variation elements and as profiled guiding elements, wherein at least two ribs (11, 12) overlap on a flat side (3) and are undercut in opposite directions, characterized in that an elevation (15, 16) is provided in the outer flank (11a, 12a) of at least one of the two ribs (11, 12).
14. The locking cylinder according to claim 13 for a flat key according to claim 3, characterized in that in addition to the two oppositely undercut ribs (11, 12), a further rib (13) is provided on the opposite flat side (2), which overlaps with at least one of the two oppositely undercut ribs (11, 12).
15. The locking cylinder according to claim 14 for a flat key according to claim 4, characterized in that the two undercut ribs (11, 12) and the further rib (13) are arranged in the central region of the two flat sides (2, 3), where the head ends of the core pins (112) lie.
16. The locking cylinder according to any one of claims 13 to 15 for a flat key according to claim 5, characterized in that the two undercut angles (α, ß) are different sizes.
17. The locking cylinder according to any one of claims 13 to 16 for a flat key according to claim 6, characterized in that an elevation (15, 16) is provided on the outer flanks (11a, 12a) of both ribs (11, 12).
18. The locking cylinder according to claim 17 for a flat key according to claim 7, characterized in that the two elevations (15, 16) are symmetrical.
19. The locking cylinder according to claim 18 for a flat key according to claim 8, characterized in that the axis of symmetry is at an oblique angle to the longitudinal center plane (6) of the key channel (103).
20. The locking cylinder according to any one of claims 13 to 19 for a flat key according to claim 9, characterized in that the elevation(s) (15, 16) are rounded on the outside.

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