DE9307547U1 - Locking cylinder - Google Patents

Description

Lock cylinder

Description
genus

The innovation relates to a locking cylinder with pin tumblers, with a cylinder housing in which a cylinder core with a circular cross-section and a longitudinal profile is arranged in the key channel for a flat key with variable recesses provided on at least one broad side of the key, and with pin tumblers extending transversely to the core longitudinal axis (rotation axis), each arranged in a row or in rows, and comprising at least one core pin, opposite which matching recesses in the flat key lie, with each core pin being assigned a counter pin that can be adjusted against spring force and can be moved against spring force in a bore arranged in the cylinder housing, with the core pins and the counter pins

in the open position, the surfaces are arranged opposite one another in the locking plane of the lock.

State of the art

Specialist companies offer unlocking methods, training in these unlocking methods through demonstration events and videos, and also break-in tools that can be used to open lock cylinders of all kinds in seconds, relatively quietly and without leaving any major traces. This is a major problem in all areas, e.g. in hospitals (drug cabinets), for vending machine operators, for jewelry containers, display cases and other valuables containers (Fundamental unlocking methods for locks - pin and disc locks, brochure by Jerry Hoffman of HPC International a Division of HPC, Inc., Schüler Park, IL 60176, USA).

In the cylinder locks known to date, the surfaces of the tumbler and the associated counter pins facing each other, which lie in the locking plane in the open locking position, are spherical. This requires relatively large tolerances, which result in a relatively

small diameter of core and counter pins. As a result, such locks can be broken open, e.g. using the core pulling method, by shearing off the pins.

Task

The innovation is based on the task of creating a locking cylinder of the type presupposed in the generic term of claim 1, the unlocking security of which is considerably increased.

Definition: "Lock security" is the degree of difficulty in overcoming the locking elements of a locking cylinder without using force and without knowledge of the associated key.

Solution

This problem is solved by the features set out in claim 1 or claim 2 .

Some advantages

In the new locking cylinder, a surface running parallel to the rotation axis (longitudinal axis) of the core is milled on the core, which has at least the width of the tumbler pin. The tumbler pin and the associated counter pin are flat on the facing end faces, which lie in the locking plane when the lock is in the open position, so that these surfaces lie flush and flatly parallel to one another in the locking plane. These flat-machined surfaces run orthogonally to the longitudinal axis of the tumbler pin and the associated counter pin when the lock is in the open position. This means that the tolerance that was previously required due to the spherical design of at least the tumbler pin can be reduced considerably, practically to zero. It is therefore possible to set this tolerance constructively to a predetermined amount. As a result, the diameter of the tumbler pin and the counter pin can be increased considerably. As a result, these pins can no longer be sheared off, so that the usual core pulling methods fail.

The same applies to the solution according to the secondary claim 2. Here, the surfaces facing each other are concave and convex (matching each other). In this case too, the tolerance can be reduced to practically zero.

Further innovative embodiments

According to claim 3, the locking pin and the counter pin, as well as a rivet if necessary, are hollow, e.g. hollow-bored. With this design, attempts to break open the lock using compressed air fail because the air can escape to the outside through the holes.

In master key systems with normal keys, the system is constructed using different profiles and split tumbler pins. These split tumbler pins reduce the security of the corresponding locking cylinders. In the "Kaba" system, tumbler pins are omitted entirely in order to be able to create systems. Security also suffers.

By arranging at least one tumbler pin with an eccentric locking tip, tumbler pins do not need to be divided or omitted. The locking tips can be given a variety of variations by appropriate rotation, offset tumbler holes in subordinate keys - e.g. 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, 180 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees, 330 degrees, 360 degrees. In master keys, a locking ring is milled in so that the master key can close all of these locks ( protection claim 4).

The locking lugs can be designed in different geometrical ways according to claim 5. For example, they can end in a point (pointed) according to claim 6 , or be flattened at the locking lug (claim 7) . However, it is also possible to design the tumbler pins flat and/or bevelled in the area of their locking lugs according to claim 8 (claim 8) . Claim 9 describes an advantageous embodiment of the invention. Claim 10 describes an embodiment in which

the locking lugs are trapezoidal in shape. Claim 11 describes the possibility of rotating the various locking lugs in order to cover the various locking variants in a master key system, while claim 12 claims the arrangement of a milled locking ring for the master key.

A further increase in the number of locking variants can be achieved by installing a smaller tumbler pin in the larger tumbler pin according to claim 13. The locking lug of the smaller tumbler pin preferably has a different eccentricity than the main tumbler pin. By varying the eccentricities for the smaller tumbler pin, further locking variants can also be achieved in conjunction with the variation of the eccentricities and the angle of rotation for the locking lugs of the main tumbler pin.

According to claim 14, the small tumbler pin is arranged in a through hole of the larger tumbler pin so as to be displaceable in the longitudinal axis direction, while the counter pin is arranged against spring force in a blind hole of the larger counter pin.

According to claim 15, the longitudinal displacement of the tumbler pins is limited by a stop, which also applies to any smaller tumbler pins.

Claim 16 describes a further advantageous embodiment of the invention. In this case, each tumbler pin and each counter pin is tubular and each concentrically accommodates another tumbler pin and counter pin, with the inner tumbler pin being limited in its axial displacement in relation to the key channel by a stop. This middle tumbler pin is also assigned recesses in the key. This results in a further variety of variations.

According to claim 17, the tumbler and counter pins are equipped with an anti-twisting device. This is particularly advantageous for tumbler pins equipped with an eccentric locking nose.

In the embodiment according to claim 18, the "re-locking security" and "scanning security" are particularly difficult.

The term "relocking security" refers to the degree of difficulty in operating the locking cylinder with a key other than the corresponding key.

The term "scanning security" refers to the degree of difficulty in determining the locking code of the tumblers of a locking cylinder using suitable tools without using force or leaving any traces in order to produce a duplicate key based on the determined values (dimensions).

Because double pin pairs are used according to claim 18 , an attempt to open the device with a picking gun is made more difficult.

This applies in particular to claims 19 and 20.

According to claim 22, the tip of the tumbler pin is designed to be deformable. As a result, if an attempt is made to break it open, the tumbler tip is deformed so that the core can no longer be rotated.

For this purpose, according to claim 21, the tip of the tumbler pins can be provided with predetermined breaking points or predetermined deformation points.

For this purpose, claims 22 and 23 represent a preferred embodiment.

The drawing shows the innovation - partly schematically - using several examples. They show:

Fig.l a locking cylinder in a cross-section orthogonal to the axis of rotation of the core, in a design that is state of the art;

Fig. 2 shows a locking cylinder according to the innovation in a cross-section corresponding to Fig. 1;

Fig. 3 shows a further embodiment according to the innovation, also in a cross section according to Fig. 2;

Fig. 4 is a plan view of a core, tumbler pins and counter pins and millings of different diameters for such pins;

Fig. 5 shows a further embodiment of a locking cylinder, also in a cross-section orthogonal to the axis of rotation of the core;

Fig. 6 shows yet another embodiment of the innovation, also in a cross-section orthogonal to the longitudinal axis of the core;

Fig. 7 shows a further embodiment of a locking cylinder according to the innovation in a similar cross-section;

Fig. 8 shows a further embodiment of the innovation, also in cross-section, partly broken away;

Fig. 9 shows a further embodiment of a locking cylinder according to the invention, partly in a cross-section orthogonal to the axis of rotation of the core, partly broken away;

Fig. 10 also shows a further embodiment of a locking cylinder according to the invention in a cross-section orthogonal to the axis of rotation, partially broken away;

Fig.11 shows another embodiment in a similar cross-section;

Fig.12 another embodiment of the innovation, also in a cross-section;

Fig. 13 shows a detail from Fig. 12 on a larger scale;

Fig.14 is a plan view of Fig. 13;

Fig.15 Drilling patterns on a key, seen through the pin holes on a core;

Fig.16 a key, in longitudinal section, partly broken off shown with various indentations;

Fig.17 different drilling patterns matching the recesses ;

Fig.18 also shows a key in longitudinal section, partly broken off;

Fig.19 is a plan view of Fig. 18;

Fig.20 shows a locking cylinder, partly broken away, according to the invention;

Fig.21 a section along the line XXI - XXI of Fig. 20;

Fig.22 also shows a locking cylinder according to the innovation, partially broken away, in a further embodiment;

Fig.23 is a front view of Fig.22 in the direction of arrow A in Fig.22;

Fig.24 shows a flat key matching Fig. 22 in plan view;

Fig.25 various possible variations for the arrangement of the locking nose of the eccentric locking pin;

Fig.26 a suitable master key for the embodiment according to Fig. 22;

Fig.27 a section along the line XXVII - XXVII of the Fig. of Fig. 29;

Fig.28 is a section along the line XXVIII - XXVIII of Fig. 27;

Fig.29 shows a locking cylinder in a further embodiment, partly in side view, partly broken away;

Fig.30 a section along the line XXX - XXX of Fig. 29.

In all drawing figures, the reference symbol 1 designates a cylinder body, 2 a cylinder core, 3 a driver, 4 a tumbler pin, 5 a counter pin, 6 a rivet, 7 a tumbler spring and 8 a flat key.

Fig. 1 shows a design according to the state of the art. The dimension X indicates the tolerance, since the front surface of the tumbler pin 4 is convex on its front side 9 facing the counter pin 5, while the counter surface 10 of the counter pin 5 runs orthogonally to the longitudinal axis 11 of the tumbler pin 4 and the counter pin 5, i.e. is flat. Due to the relatively large tolerance dimension X, the diameter of the tumbler pin 4 can only be made small.

In contrast, Fig. 2 shows an embodiment according to the innovation. In this case, the front face 9 of the tumbler pin 4 and the counter surface 10 of the counter pin 5 are both flat and run orthogonally to the longitudinal axis 11. As a result, the tolerance X at this point is practically zero. It can be predetermined by design. The cylinder core 2 is

At this point - in the locking plane - at least over a width corresponding to the diameter of the tumbler pin 4 and the counter pin 5, it is also provided with a surface 12 orthogonal to the longitudinal axis 11.

In the embodiment shown in Fig. 3, the front side 9 is designed to be convex to match the concave counter surface 10, so that both surfaces 9 and 10 lie flush against one another, whereby the tolerance dimension X is also zero.

Fig. 4 shows how the surfaces 12 on the cylinder core are to be designed for different diameters of tumbler pins 4. The left surface 12 - seen in the drawing plane of Fig. 4 - is designed for a diameter of five millimeters, the middle surface 12 for a diameter of three and the right surface for a diameter of seven millimeters.

In the embodiment according to Fig. 5, the same reference numerals as in the previously described embodiments have been used for parts with the same function. The embodiment according to Fig. 5 differs from the previously described embodiments in that parallel

and at a distance from one another, namely symmetrically to the axis of rotation of the cylinder core 2, a tumbler pin 4a or 4b and an associated counter pin 5a or 5b arranged coaxially thereto are arranged. As in the previously described and all other embodiments, the counter pins 5 or 5a, 5b are supported against the restoring force of tumbler springs 7 or 7a, 7b, which in turn are supported under pre-tension on a rivet 6 or 6a, 6b. Instead of - as can be seen from Fig. 5 - only one pair of tumbler pins 4a, 4b with counter pins 5a and 5b arranged transversely to the axis of rotation of the cylinder core 2, several such pairs of tumbler pins 4a, 4b and associated counter pins 5a, 5b can also be arranged in the longitudinal direction of the axis of rotation of the cylinder core 2.

In the embodiment shown in Fig. 6, the same reference numerals have been used for parts with the same function as in the previously described embodiments. This embodiment differs from the previously described embodiments in that the tumbler pin has an eccentric locking nose 14, the longitudinal axis 15 of which is arranged at a distance Y from the center of the axis of rotation of the cylinder core 2.

The reference number 13 designates an anti-twisting device for the respective tumbler pin 4, which is designed as webs formed in one piece with the tumbler pin 4. The webs 13 engage in core grooves 16, which run parallel to the longitudinal axis 11 and which are tangent to the longitudinal axis 15 of the locking lug 14 in relation to the flat key 8 and thus to the recess 17. This recess is designed like the locking lug 14. The locking lug 14 does not have a pointed end. Rather, the front side is limited by a surface 18 running orthogonally to the longitudinal axis 15, to which a conical surface 19 is connected, for example, so that the recess has the overall shape of a truncated cone. In contrast, the recesses 20 and 21 in the embodiment according to Fig. 5 are tapered at their deepest point, so that the recesses 20 and 21 are limited by a pointed cone with a cone angle of 90 degrees, for example. The locking lug 22 in Fig. 5 is also formed at an acute angle. The corresponding tumbler pin 4b thus engages with its pointed locking lug 22 in the recess 21. The tumbler pin 4a is also

The end section facing the flat key 8 is limited by a surface 23 which can engage in the recess 20 in a form-fitting manner.

Again, the same reference numerals were used in the embodiment according to Fig. 7 as in the embodiment according to Fig. 6. The embodiment according to Fig. 7 differs from the embodiment according to Fig. 6 in that a tumbler pin 4b with a smaller diameter is arranged in the tumbler pin 4a so that it can be moved longitudinally with its longitudinal axis parallel to the longitudinal axis of the main tumbler pin 4a. This tumbler pin 4a with a smaller diameter is assigned a counter pin 4b that is also smaller than the main counter pin. For this purpose, the main counter pin 4a has a blind hole 24 in which a tumbler spring 7b is arranged under prestress, which is supported on the bottom of the smaller counter pin 5b. The longitudinal axis 25 of the tumbler pin 4b with a smaller diameter is arranged at a distance Z from the longitudinal axis 11. Z can be as large as Y, so that the tumbler pins 4a and 4b are arranged symmetrically with respect to the longitudinal axis 11. It is, however, also possible to make Z smaller than Y in order to achieve more locking variants. The

The locking nose 14 of the tumbler pin 4a is designed like the locking nose 14 in the embodiment according to Fig. 6, while the locking nose of the smaller diameter tumbler pin 4b is designed like the tumbler pin 4a in the embodiment according to Fig. 5, which is why the upper front surface was provided with the reference number 23. The depression 20 also corresponds in shape to the depression 20 of the embodiment according to Fig. 5, so that the reference number 20 was also entered at this point in Fig. 7.

As can be further seen from Fig. 7, the part intended for receiving the smaller tumbler pin 4b ends with its front surface 26 below the key channel 27 and remains at a certain distance when the locking tip 14 enters the corresponding recess 17 of the flat key 8.

The embodiment according to Fig. 8 differs from the embodiment according to Fig. 7 in that the flat key 8 is provided with a large depression 28, which is limited at its deepest by a surface running parallel to the transverse axis 29, which is directed orthogonally to the longitudinal axis 11 and passes through the center of rotation

of the core 2. The surface 18 is larger than the surface 18 in Fig. 7. Furthermore, the smaller diameter tumbler pin 4b engages with a truncated conical locking nose 30 in a correspondingly shaped recess in the flat key 8.

In addition, the wall 31 of the larger-diameter tumbler pin 4a, which guides the smaller-diameter tumbler pin 4, also extends into the recess 28 and rests with an obliquely running chamfer 32 on the conical surface of the recess 28, which runs at the same angle.

For the other functionally corresponding parts, the same reference numerals were used as in the embodiment according to Fig. 7, so that reference can be made to the explanations there.

In the embodiment according to Fig. 9, the same reference numerals were used for parts with the same function as in the embodiment according to Fig. 8. The embodiment according to Fig. 9 differs from the embodiment according to Fig. 8 essentially in that the wall 31 ends in front of the key channel 27 and the locking lug 30

on the side facing the wall 31, it rests practically over its entire surface against the recess in the flat key 8. In contrast, the locking lug 14 of the tumbler pin 4a engages in the recess 18 of the flat key 8 over a smaller length section than in the embodiment according to Fig. 8.

In the embodiment according to Fig. 10, the same reference numerals as in the previously described embodiments were used for parts with the same function.

The embodiment according to Fig. 10 differs from the previously described embodiments in that a tumbler pin 4b with a smaller diameter is arranged in a hollow, tubular main tumbler pin 4a and can be moved longitudinally by a limited amount. The falling out of this tumbler pin 4b is limited by a ring stop shoulder 33. The tumbler spring 7b is supported against a ring end wall in the also tubular counter pin 5a under pretension against the tumbler pin 5b with a smaller diameter. The tumbler pin 4b is flat on its end face that penetrates into the flat key 1. This end face 34 runs orthogonally to the longitudinal axis 11.

35 designates a recess tip into which the inner tumbler pin 4b cannot enter in the embodiment shown. However, a corresponding formation can be integrally connected to the inner tumbler pin 4b, which can enter this recess tip 35.

The remaining recess 36 runs in the manner of a truncated cone. The outer, tubular tumbler pin 4a engages here with its front end 37. At this end, the tumbler pin 4a is also conically chamfered at 38 and is limited on its upper front side at 39 by an annular front surface, the plane of which also runs orthogonally to the center line 11.

In the embodiment according to Fig. 11, the same reference numerals as in the previously described embodiments were used for parts with the same function. This embodiment differs from the previously described in that the tumbler pin 4 and the counter pin 5 are tubular. Inner bores 54 and 55 are the same diameter and are arranged coaxially to one another. These bores 54 and 55 have

the longitudinal axis 11 as the center line. In this case, the flat key 8 has a recess 36 of a truncated cone shape, into which the tumbler pin 4 engages with a shaped end section. The air can escape through the holes 54, 55 when attempting to break it open with compressed air.

In the embodiment according to Fig. 12, the same reference numerals were also used for parts with the same function. This embodiment differs from the previously described embodiments in that the tumbler pin 4a and the counter pin 5a are also tubular - as in the embodiment according to Fig. 11 - with the difference that the holes 54 are provided with an annular shoulder 56 to limit the displacement path of a tumbler pin 4a arranged coaxially in the tubular tumbler pin 4b, offset in diameter, which also has an annular shoulder 40 that can interact with the stop shoulder 56.

The bore 55, on the other hand, is of the same diameter and is continuous. In this bore 55, there is also an inner counter pin 5b of rod-like shape, which is supported against a tumbler spring 7a, while the tubular counter pin 5a is supported against a tumbler spring 7b. For this purpose, the tubular counter pin 5a has a hollow groove in which the tumbler spring 7b lies. The rivet 6 also has a corresponding hollow groove, which centers the tumbler spring 7b.

The rod-shaped counter pin 5b, on the other hand, rests against the locking spring 7a, which is arranged under pre-tension in the deepest part of the rivet 6 and rests against the end face of the rod-shaped counter pin 5b, which runs orthogonally to the longitudinal axis 11.

The tubular tumbler pin 4b is provided at its end section with several slots 41, 42, 43 and 44 running parallel to the longitudinal axis 11, which penetrate the wall of the tubular tumbler pin 4b. This weakens the wall at this point, so that in the event of any manipulation, the resulting

Webs 45, 46, 47 or 48 are deformed, after which closing the locking cylinder is impossible.

The webs 45 to 48 are provided with a chamfer on their outer front side, which forms a common surface - at 49. The webs 45 to 48 thus penetrate into a corresponding recess 50 in the key 8, while the tumbler pin 4 with a locking lug 51 cut off at the top penetrates into a recess 52, which opens into the recess 50 in the flat key 8.

In addition, the webs 45 to 48 are provided with a circumferential undercut 53, i.e. extending 360 degrees, which runs orthogonal to the longitudinal axis 11 and ends at a certain distance from the outer surface of the webs 45 to 48. This results in a further weakening of these webs 45 to 48.

In all embodiments, the locking pins 4 are prevented from falling into the key channel 27 by stop shoulders.

It is also pointed out that in all embodiments the construction as in the embodiment according to Fig. 5 with locking and counter pins arranged at least in pairs is possible. In addition, several such pin pairs can be arranged next to one another at a distance in the direction of the rotation axis of the cylinder core 2.

Furthermore, it is possible to use different designs on one and the same locking cylinder. This not only significantly improves the "unlocking security", but also the "relocking security" and the "scanning security" and achieves an enormous number of permutations.

Fig. 15 to 17 show drilling patterns for the key with different locking tips. Fig. 20 and 21 show the application of the inventive concept with a locking cylinder according to Fig. 2, while Fig. 22 to 26 illustrate a locking cylinder for a main locking system. Fig. 24 shows a normal key and Fig. 26 a master key, while Fig. 25 shows, for example, the offset options for the eccentric locking nose (Fig. 22). The design

This locking cylinder corresponds to the design in Fig. 6.

Fig. 27 to 30 show a locking cylinder in which the most diverse locking cylinder types shown in the drawings are combined. One can see tumbler pins arranged in pairs of the most diverse designs, e.g. according to the drawings in Fig. 2, 3, 5, 6 and 11. Of course, other mixed forms can also be used in one and the same locking cylinder. This greatly increases the "unlocking security", the "relocking security" and the "scanning security".

The features described in the abstract, in the claims and in the description as well as those evident from the drawing can be essential for the realisation of the innovation both individually and in any combination.

Bibliography

Fundamental Lock Picking Methods - Pin and Disc Locks, brochure by Jerry Hoffman of HPC International a Division of HPC, Inc., Student Park, IL 60176, USA

Z.: "Higher quality cylinder technology more in demand than ever" by Erwin Müller, Tür + Tor-Report 13th year 1st quarter 1993 p. 17/18

List of reference symbols

1 cylinder body

2 cylinder core

3 carriers

4 Locking pin 4a 4b

5 Counter pin 5a 5b

6 Rivet 6a 6b

7 Locking spring 7a 7b

8 flat keys

9 Front face Counter surface

11 Longitudinal axis 12 Area of the cylinder core 13 Anti-twist device 14 locking lug 15 Longitudinal axis 16 Core groove 17 depression 18 Area 19 Conical surface 20 depression 21 22 locking lug 23 Area 24 Blind hole 25 Longitudinal axis 26 Frontal area 27 Key channel 28 depression 29 Transverse axis 30 locking lug 31 Wall 32 Chamfering 33 Ring stop shoulder 34 Front side

35 depression peak 36 depression 37 End, front 38 Conical surface 39 Front side 40 Ring shoulder 41 slot 42 It 43 tt 44 The 45 web 46 H 47 ti 48 H 49 Shell surface 50 depression 51 Closing tip 52 depression 53 Back rotation 54 drilling 55 The 56 Ring shoulder

X Tolerance dimension Y Distance

Claims (23)

5314/42 B 19 May 1993 Gerd Niederdrenk Graduate Engineer Kuhlendahler Straße 36 D-5620 Velbert-Tönisheide Protection claims 1. Locking cylinder with pin tumblers, with a cylinder housing in which a cylinder core with a circular cross-section and a longitudinal profile is arranged in the keyway for a flat key or a longitudinally ribbed flat key with variable recesses provided on at least one broad side of the key or the like, and with pin tumblers extending transversely to the longitudinal axis of the core (rotation axis), each arranged in a row or in rows, and the comprise at least one core pin, opposite which matching recesses in the flat key are located, each core pin being associated with a counter pin which is adjustable against spring force and which is displaceable against spring force in a bore arranged in the cylinder housing, the core pins and the counter pins being arranged with opposite surfaces in the locking plane of the lock in the open position, characterized in that a) the tumbler and counter pin (4, 5) are formed on the mutually facing end faces (9, 10) in the open position of the locking cylinder with surfaces (9, 10) lying flat on top of one another and orthogonal to a longitudinal center axis of the cylinder pin (4) and the counter pin (5) running through the longitudinal axis of rotation (11), and that b) the cylinder core (2) in the area of its bore receiving the tumbler pin (4) is provided with a groove parallel to is provided with a straight surface (12) running along its longitudinal axis of rotation and corresponding at least to the diameter of the tumbler pin (4). 2. Locking cylinder with pin tumblers, with a cylinder housing in which a cylinder core with a circular cross-section and a longitudinal profile is arranged in the key channel for a flat key with variable recesses provided on at least one broad side of the key, and with pin tumblers extending transversely to the core longitudinal axis (rotation axis), which are each arranged in a row or in rows, and which comprise at least one core pin, opposite which matching recesses in the flat key are located, with each core pin being assigned a counter pin which is adjustable against spring force and which can be displaced against spring force in a bore arranged in the cylinder housing, with the core pins and the counter pins in the open position being arranged with opposite surfaces in the locking plane of the lock, characterized in that a) the tumbler and counter pin (4, 5) are designed on the mutually facing end faces (9, 10) with convex-concave surfaces that fit together in a form-fitting manner in the open position of the locking cylinder, and b) that the cylinder core (2) in the area of its bore receiving the tumbler pin (4) is provided on its peripheral surface with a straight surface (12) running parallel to its longitudinal axis of rotation and corresponding at least to the diameter of the tumbler pin (4). 3. Locking cylinder according to claim 1 or 2, characterized in that the tumbler pin (4), the counter pin (5) and the rivet (6) are hollow-bored (Fig. 11). 4. Locking cylinder according to claim or one of the following, characterized in that the tumbler pin (4) is provided with at least one eccentric locking nose (14) (Fig. 6). 5. Locking cylinder according to claim 4, characterized in that the locking nose (14) has a different geometric design. 6. Locking cylinder according to claim 5, characterized in that the locking nose (4) ends in a point (e.g. Fig. 5). 7. Locking cylinder according to claim 5, characterized in that the locking nose (14) is flattened. 8. Locking cylinder according to claim 5, characterized in that the locking nose (14) is flat in cross section. 9. Locking cylinder according to claim 4 or one of the following, characterized in that a smaller tumbler pin (4b) is provided with an eccentric locking nose to increase the locking variations. -β-locking cylinder according to claim 5, characterized in that the locking nose (14) is trapezoidal in longitudinal section. 11. Locking cylinder according to claim 5 or one of the following, characterized in that the locking nose (14) is rotatable (adjustable) in the circumferential direction to different locking permutations. 12. Locking cylinder according to claim 5 or one of the following, characterized in that a master key (8) is provided with a locking ring in the region of each tumbler pin (4). 13. Locking cylinder according to claim 1 or one of the following, characterized in that a tumbler pin (e.g. 4b) of smaller diameter is arranged parallel to the main tumbler pin (4) and a special counter pin (4a) is assigned to this. —7— 14. Locking cylinder according to claim 13, characterized in that the counter pin (4b) for the secondary tumbler pin (4a) is arranged against the restoring force of a tumbler spring (7b) in a blind bore of the main tumbler pin (4a). 15. Locking cylinder according to claim 13 or 14, characterized in that a stop is provided for the secondary tumbler pin (4b) in the main tumbler pin (4a), which stops limits the axial displacement path of the secondary tumbler pin (4b) in relation to the key channel (27). 16. Locking cylinder according to claim 1 or one of the following, characterized in that the tumbler pin (4b) and the associated counter pin (5a) are tubular and that a solid tumbler pin (4b) and an associated solid counter pin (5b) are arranged in both the tubular tumbler pin (4a) and the tubular counter pin (5a) and that both the tubular tumbler pin (4a) and the tubular counter pin (5a) and the tubular pins (4a, 5a) arranged tumbler pins (4b) or the solid counter pin (5b) are arranged coaxially to each other, wherein the displacement path of the solid tumbler pin in the direction of the key channel (27) is limited by a stop (40, 56). 17. Locking cylinder according to claim 1 or one of the following, characterized in that the tumbler pin (4) and the counter pin (5a) are assigned an anti-twist device (e.g. 13, 16) which prevents the tumbler pin (4) or the counter pin (5a) from twisting about its longitudinal axis. 18. Locking cylinder according to claim 1 or one of the following, characterized in that several, e.g. two, tumbler pins (4a, 4b) and the counter pins (5a, 5b) associated with them are each arranged in a plane running transversely to the longitudinal axis of rotation of the core and that, if necessary, several such tumbler and counter pin pairs (4a, 4b or 5a, 5b) are arranged parallel and at a distance one behind the other in the longitudinal direction of the axis of rotation. 19. Locking cylinder according to claim 1 or one of the following, characterized in that geometrically differently designed tumbler pins (4) with their counter pins (5) are arranged one behind or next to one another in the longitudinal rotational axis direction and/or transversely to the longitudinal rotational axis direction (Fig. 27). 20. Locking cylinder according to claim 1 or one of the following, characterized in that at least one tumbler pin and a counter pin arranged thereto are arranged behind the driver (3). 21. Locking cylinder according to claim 1 or one of the following, characterized in that one or more tumbler pins (4) are designed to be deformable at their end region facing the flat key (8) (Fig. 12). 22. Locking cylinder according to claim 21, characterized in that the tumbler pin (4) is provided at its end region facing the flat key (8) with deformable walls (e.g. 45) distributed over its circumference. - 10 - 23. Locking cylinder according to claim 21 or 22, characterized in that the tumbler pin (4) is provided at its end region facing the flat key (8) with axially parallel incisions (41, 42, 43, 44) preferably evenly distributed over its circumference and a recess (53) arranged at a distance from its free end for forming deformable walls (45, 46, 47, 48).