EP2851491B1 - Locking system - Google Patents

Description

The invention relates to a system comprising a cylinder lock and at least three keys, a cylinder lock for such a system and a use of a flat key for awarding a first locking authorization and at least a second blocking authorization of such a cylinder lock.

A long-standing task of safety technology is to provide systems of cylinder locks and associated keys, in which on the one hand keys are provided which lock the lock anyway, while on the other hand keys are provided which lock the lock only in the presence of an authorization. For example, certain keys should always be able to lock, others should be able to operate only the lock, and lock other keys only in certain cases, but not in others.

From the publication US 4,185,480 A Although a cylinder lock with two independent housing pin arrangements is known whose authorization can be assigned by mechanical means of a separate service key; however, the service key itself is not suitable for locking the lock.

In addition, electronic locking systems are known in which the authorization is assigned centrally by electronic means, the keys are encoded accordingly and the lock is a query of the code. However, such systems have the disadvantage that on the one hand they are expensive to implement, and on the other hand always require a supply of electrical energy.

The object of the invention is to shaffen an alternative system of a cylinder lock and associated keys and a cylinder lock for it, in which the authorization for the lock can be awarded in a simple, mechanical way.

This object is achieved in that in a system shown at the outset of a cylinder lock and at least three keys, the award of the blocking privileges in the cylinder lock on mechanical way by the first key itself and by the other defined in claim 1 features. The first key not only serves to lock the lock, but sets depending on its position when deducting by pressing a locking element a first or a second locking authorization.

According to the invention, a movable blocking element can be provided which is reversibly movable by the first key from a first position corresponding to the first blocking authorization to a second position corresponding to the second blocking authorization. The blocking element can in particular be designed as a setting ring, which switches over between a first housing pin arrangement and a second housing pin arrangement, wherein the third key can block only one of these two housing pin arrangements.

According to the invention it can be provided that the cylinder lock is in communication with a trap and a fourth key is provided which can not assign authorizations, the cylinder lock does not lock, but can operate the case.

As a result, the following functions preferably result for four possible keys: Key A can always lock the lock and assign the lock authorizations; Key B can always lock the lock and not grant lock privileges; Key C can only lock the lock in a single lock privilege; Key D can never lock the lock, but only operate the latch.

According to the invention may further be provided that means are provided which allow removal of the first key (key A) only in the first or second position, and prevent removal of the other key in a position which is not equal to the Ansteckposition. This ensures that only the key A granting the authorization can change the position of the lock element According to the invention, it may be provided that a first housing pin arrangement and a second housing pin arrangement are provided, wherein the cylinder lock is designed in the first position for interrogating the first housing pin arrangement, and in the second position for interrogating the second housing pin arrangement.

The invention further extends to a cylinder lock for such a system according to the invention, comprising a cylinder housing and a cylinder core rotatably mounted therein, wherein in the cylinder core core pin holes with core pins and housing housing bores are provided with housing pins in the cylinder housing.

In the cylinder housing, a first housing pin assembly and at least one second housing pin assembly is provided, which are preferably arranged offset to one another at an angle. For the cylinder core, a first defined cylinder core position and a second defined cylinder core position is provided, wherein the core pins cooperate in a first cylinder core position with the first housing pin assembly and cooperate in a second cylinder core position with the second housing pin assembly.

In the cylinder housing, the first housing pin assembly includes a first blocking pin and the second housing pin assembly includes a second blocking pin. In the cylinder core, the core pins comprise an actuating pin, which cooperates in the first cylinder core position with the first locking pin and in the second cylinder core position the second locking pin.

Between the cylinder core and the cylinder housing, a rotatably arranged adjusting ring is provided, which has an adjusting ring opening at its periphery, wherein the adjusting ring between a first adjusting ring position for interrogating the first blocking pin in the first cylinder core position and a second adjusting ring position for interrogating the second blocking pin in the second cylinder core position is movable back and forth.

In this case, the blocking pins are designed or arranged such that the first blocking pin can penetrate into the cylinder core in the first adjusting ring position and block it, and the second blocking pin in the second setting ring position can not penetrate into the cylinder core and block it.

This makes it possible that the function of the second locking pin is turned off by moving the adjusting ring from the first adjusting ring position to the second adjusting ring position. Thus, keys may be provided which do not lock the cylinder lock in the first setting position while locking the cylinder lock in the second setting position.

Authorization is granted by rotating the adjusting ring, wherein the cylinder core pins interrogate either the first housing pin assembly with the first locking pin, or the second housing pin assembly with the second locking pin. In order to prevent the keys can be removed in a wrong position, at least one control slide is provided in the cylinder core, which engages at one end in the adjusting pin, and engages at the other end in an exemption of the adjusting ring. This ensures that the adjusting pin located in the cylinder core only releases the inserted key when the control slides are in the appropriate exemptions of the adjusting ring. As a result, this means that the key can only be removed in certain cylinder core positions, preferably in the first and second defined cylinder core or adjusting ring position.

In order to prevent the second blocking pin from penetrating into the cylinder core, it may be provided that the first blocking pin is centered relative to the setting pin in the first cylinder core position, and the second blocking pin is offset relative to the setting pin in the second cylinder core position. As a result, the second blocking pin remains hanging at the interface between the adjusting ring and the cylinder core and can not penetrate into the cylinder core. For this purpose, it can also be provided to carry out the adjusting ring opening of the adjusting ring as a slot in order to enable both the first blocking pin and the second blocking pin offset thereto to be able to penetrate the setting ring opening.

Alternatively it can be provided that the first blocking pin has a diameter which is smaller than the diameter of the adjusting ring opening, and the second blocking pin has a diameter which is greater than the diameter of the adjusting ring opening. As a result, the second locking pin will stick to this larger diameter and can not penetrate into the cylinder core.

According to the invention it can be provided that the second blocking pin at least in sections has an extension which extends over the diameter of the adjusting ring opening, so that it can not penetrate into the cylinder core.

In particular, it can be provided that the second blocking pin has a base whose diameter is greater than the diameter of the adjusting ring opening, and has a nose whose diameter is smaller than the diameter of the adjusting ring opening, wherein the extent of the nose is less than or equal to the thickness of the adjusting ring is in the range of the adjusting ring opening. As a result, the function according to the invention is likewise achieved in that the second blocking pin can not penetrate into the cylinder core.

According to the invention it can be provided that a control groove is provided on the inner circumference of the adjusting ring. This makes it possible to provide a further division level, which is located at the bottom of this control groove. The control groove can extend over any desired angular range, preferably over an angular range of 90 ° to 270 °, particularly preferably 180 °.

By pressing the adjusting pin to the bottom of the control groove, the situation arises that the cylinder core can be rotated over the angular range of the control groove, but not further. As a result, for example, the case of the lock can be actuated, but not a closing operation can be performed. The correspondingly executed key is thus suitable in any case only for actuating the case.

The invention further extends to the use of a flat key for awarding a first blocking authorization and at least a second blocking authorization of a cylinder lock according to the invention, wherein the flat key has a milling which presses the setting pin of the cylinder lock on the outer circumference of the adjusting ring.

The invention further extends to a system of a cylinder lock according to the invention and at least one such flat key.

In particular, in such a system, a first flat key (key A) may be provided, the milling is carried out such that the adjusting pin is pressed against the outer circumference of the adjusting ring; and a second flat key (key B) may be provided, the milling of which is carried out such that the adjusting pin is pressed against the inner circumference of the adjusting ring; and a third flat key (key C) be provided, the milling is carried out such that the adjusting pin is not pressed up to the adjusting ring, but remains in the cylinder core.

According to the invention a fourth flat key (key D) may be provided in the system, the milling is carried out such that the adjusting pin is pressed against the groove bottom of the control groove.

Further features of the invention will become apparent from the description of the figures and the drawings, insofar as they fall under the appended claims, and from the claims.

Fig. 1:

eine Explosionsdarstellung eines erfindungsgemäßen Schließzylinders;

Fig. 2a-2b:

den Stellring zur Verwendung in einem erfindungsgemäßen Schließzylinder;

Fig. 3:

zwei Aufsichtdarstellungen eines erfindungsgemäßen Schließzylinders in Zylinderkernposition 1;

Fig. 3a - 3d:

Schnittdarstellungen des erfindungsgemäßen Schließzylinders in Zylinderkernposition 1;

Fig. 4:

zwei Aufsichtdarstellungen eines erfindungsgemäßen Schließzylinders in Zylinderkernposition 2;

Fig. 4a - 4d:

Schnittdarstellungen des erfindungsgemäßen Schließzylinders in Zylinderkernposition 2;

Fig. 5:

dreidimensionale Darstellungen eines Flachschlüssels, der in einen erfindungsgemäßen Schließzylinder eingeführt ist;

Fig. 6:

Schnittdarstellung eines erfindungsgemäßen Schließzylinders;

Fig. 7a - 7b:

Schematische Darstellungen einer alternativen Ausführungsform des Stellrings und zweiten Blockierstifts eines erfindungsgemäßen Schließzylinders;

Fig. 8a - 8d:

Schematische Darstellungen des erfindungsgemäßen Schließzylinders bei einem Stellring und Blockierstift gemäß Fig. 7a - 7d.

The invention will be explained in more detail below with reference to exemplary embodiments. Show it

Fig. 1:

an exploded view of a lock cylinder according to the invention;

FIGS. 2a-2b:

the adjusting ring for use in a lock cylinder according to the invention;

3:

two top views of a lock cylinder according to the invention in cylinder core position 1;

3a-3d:

Sectional views of the lock cylinder according to the invention in cylinder core position 1;

4:

two top views of a lock cylinder according to the invention in cylinder core position 2;

FIGS. 4a-4d:

Sectional views of the lock cylinder according to the invention in cylinder core position 2;

Fig. 5:

three-dimensional representations of a flat key, which is inserted into a lock cylinder according to the invention;

Fig. 6:

Sectional view of a lock cylinder according to the invention;

FIGS. 7a-7b:

Schematic representations of an alternative embodiment of the adjusting ring and second locking pin of a lock cylinder according to the invention;

8a-8d:

Schematic representations of the lock cylinder according to the invention in a collar and locking pin according to Fig. 7a - 7d ,

Fig. 1 1 shows a cylinder housing 2 and a cylinder core 3 inserted therein. In the cylinder housing 2 housing pin holes 5 are provided, which are filled with housing pins (not shown). In operation, the different core pins and housing pins ensure that only when inserting the correct key results in a dividing plane in which the cylinder core 3 can be rotated in the cylinder housing 2.

In the present embodiment, further, a collar 10 is provided, which is arranged between the cylinder core 3 and the cylinder housing 2. For this purpose, the cylinder housing on a stepped edge, which allows the attachment of the adjusting ring 10. The adjusting ring 10 has at its periphery a collar opening 11 and at its inner periphery two exemptions 14th

In the cylinder housing 2, two angularly staggered arranged housing pin assemblies are provided, in this figure, only the associated housing pin holes 5 are visible. The adjusting ring opening 11 of the adjusting ring 10 is designed such that it can alternatively be brought into coincidence with one of the housing pin bores 5.

Furthermore, the first blocking pin 8 and the second blocking pin 9 are shown, which are mounted in corresponding bores of the cylinder housing under spring tension. Inside the cylinder core 3, the adjusting pin 17 is further arranged, which is depending on the position of the adjusting ring 10 and the cylinder core 3 either with the first locking pin 8 or the second locking pin 9 is engaged.

Fig. 2a and Fig. 2b show schematic views of the adjusting ring 10. This has a collar opening 11, which is designed in the present embodiment as a slot. Furthermore, the exemptions 14 are provided on the inner circumference. Also on the inner circumference a control groove 12 is provided. The control groove has a depth of preferably about 0.3 mm and extends on the inner circumference of the adjusting ring 10 over an angular range of about 180 °.

The adjusting ring 10 forms, in cooperation with the cylinder core 3 and the housing and core pins, three graduation planes for moving the cylinder core: The first graduation plane for key A forms on the outer circumference of the adjusting ring 10. The second graduation plane for key D forms on the groove bottom of the control groove 12. Finally, there is the third division level for key B on the inner circumference of the adjusting ring 10. For key C, no dividing plane is provided, since in this key the adjusting pin 17 remains in the cylinder core.

Fig. 3 as well as the following Fig. 3a - 3d show schematic representations and sections of a cylinder lock 1 according to the invention, wherein the cylinder core 3 and the adjusting ring 10 is relative to the cylinder housing 2 in a defined position (cylinder core position 1). It is in the Fig. 3a - 3d each different keys inserted into the cylinder lock, which move the setting pin 17 to different positions. However, the keys are not shown for the sake of clarity.

Fig. 3a - Fig. 3d each show on the left side a section along the line AA in Fig. 3 , and on the right side a section along the offset line CC as shown in Fig. 3a is indicated. In Fig. 3a the cylinder lock 1 comprises the cylinder housing 2 and the cylinder core 3. key A is inserted into the core, and pushes the adjusting pin 17 in the cylinder core 3 to its outermost position. As a result, the first dividing plane forms on the outer periphery of the adjusting ring 10, since the adjusting ring opening 11 is closed by the adjusting pin 17. Upon actuation of the key, the cylinder core 3 rotates and takes over the adjusting pin 17 with the adjusting ring 10.

In the cylinder housing, a first housing pin assembly 6 and a second housing pin assembly 7 is provided which are mutually offset at an angle. In the first housing pin assembly 6 is a first blocking pin 8, and in the second housing pin assembly 7, a second blocking pin 9 is provided. In the situation according to Fig. 3a However, these two blocking pins are ineffective because the adjusting pin 17 is brought into the 1st division level.

The key A used can lock the cylinder lock and switch between housing pin assembly 6 and housing pin assembly 7. Key A assigns the blocking authorization by moving the adjusting ring and can be deducted in both positions.

Fig. 3b shows the situation when key D is inserted into the cylinder lock 1. This key should only be able to actuate the latch of the lock. In this case, key D pushes the setting pin 17 up to the groove bottom of the control groove 12, so it is the second division level achieved. The first blocking pin 8 protrudes into the adjusting ring opening 11 and blocks their movement. Thus, the adjusting ring can not move with the cylinder core 3, and the adjusting pin 17 remains in rotation of the cylinder core 3 in that position in which the control groove 12 ends. This is in the two figures in Fig. 3b indicated schematically below as a stop left or stop right. As a result, the cylinder core 3 can be moved by key D only in a certain angular range determined by the control groove and, for example, actuate the latch of the lock. However, key D can not lock the cylinder lock.

Fig. 3c shows the situation when key B is inserted into the cylinder lock 1. This key should always lock. Key B pushes the adjusting pin 17 up to the inner circumference of the adjusting ring 10, so it is reached the 3rd division level. The first blocking pin 8 protrudes into the adjusting ring opening 11 and blocks their movement. Thus, the collar can not move with the cylinder core 3. However, the adjusting pin 17 does not hang upon rotation of the cylinder core 3, but the cylinder core 3 is freely rotatable. Thus, key B - like key A - can lock the cylinder lock, but does not grant a lock authorization, since the position of the adjusting ring remains unchanged.

Finally shows Fig. 3d the situation when key C is inserted into the cylinder lock 1. Key C does not push the adjusting pin 17 to the inner periphery of the adjusting ring 10, but the adjusting pin 17 remains inside the core. So none of the graduation levels is reached. The first blocking pin 8 remains hanging in the cylinder core 3 and prevents any movement of the cylinder core. Thus, key C can not lock the cylinder lock in this position of the adjusting ring.

Fig. 4 as well as the following Fig. 4a - 4d show schematic representations and sections of a cylinder lock 1 according to the invention, wherein the cylinder core 3 and the adjusting ring 10 is relative to the cylinder housing 2 in the second defined position (cylinder core position 2). It is in the Fig. 4a - 4d each different keys inserted into the cylinder lock, which move the setting pin 17 to different positions. However, the keys are not shown for the sake of clarity.

Fig. 4a - Fig. 4d each show on the left side a section along the line AA in Fig. 4 , and on the right side a section along the offset line CC as shown in Fig. 4a is indicated.

In Fig. 4a the cylinder lock 1 comprises the cylinder housing 2 and the cylinder core 3. It is inserted key A into the core, which pushes the adjusting pin 17 in the cylinder core 3 to its outermost position. As a result, the first dividing plane forms on the outer periphery of the adjusting ring 10, since the adjusting ring opening 11 is closed by the adjusting pin 17. Upon actuation of the key A, the cylinder core 3 rotates and takes over the adjusting pin 17 with the adjusting ring 10.

In the cylinder housing, a first housing pin assembly 6 and a second housing pin assembly 7 is provided which are mutually offset at an angle. In the first housing pin assembly 6 is a first blocking pin 8, and in the second housing pin assembly 7, a second blocking pin 9 is provided. In the situation according to Fig. 4a However, these two blocking pins are ineffective because the adjusting pin 17 is brought into the 1st division level. The key A used can thus lock the cylinder lock and switch between housing pin assembly 6 and housing pin assembly 7.

In the right part of the Fig. 4a a section along the offset line CC by the second blocking pin 9 and the adjusting pin 17 is shown. The second blocking pin 9 is arranged in a line with the adjusting pin 17, but offset in the normal direction to this. The offset is about 0.5mm.

Fig. 4b shows the situation when key D is inserted into the cylinder lock 1. In this case, the key pushes the adjusting pin 17 to the groove bottom of the control groove 12, so it is the second division level achieved. The second blocking pin 9 protrudes into the adjusting ring opening 11 and blocks their movement. Thus, the adjusting ring 10 can not move with the cylinder core 3, and the adjusting pin 17 remains in rotation of the cylinder core 3 in that position in which the control groove 12 ends. This is in the two figures in Fig. 4b indicated schematically below as a stop left or stop right.

As a result, the cylinder core 3 can be moved by key D only in a certain angular range determined by the control groove and, for example, actuate the latch of the lock. However, key D can not lock the cylinder lock.

Fig. 4c shows the situation when key B is inserted into the cylinder lock 1. In this case, key B pushes the setting pin 17 up to the inner circumference of the adjusting ring 10, so it is reached the 3rd division level. The second blocking pin 9 protrudes into the adjusting ring opening 11 and blocks their movement. Thus, the collar can not move with the cylinder core 3. However, the adjusting pin 17 does not hang upon rotation of the cylinder core 3, but the cylinder core 3 is freely rotatable. Thus, key B, like key A, can also lock the cylinder lock, but does not grant a lock authorization.

Finally shows Fig. 4d the situation when key C is inserted into the cylinder lock 1. Key C does not push the adjusting pin 17 to the inner circumference of the adjusting ring 10, so it is not reached the division planes. Between adjusting pin 17 and second locking pin 9 remains a gap. However, the second blocking pin 9 does not penetrate into the cylinder core 3, but remains hanging at the transition between the cylinder core 3 and adjusting ring opening 11, since the second blocking pin 9 is arranged offset relative to the adjusting pin 17.

This is on average CC the Fig. 4d clearly visible, after which there is a gap between the adjusting pin 17 and the second locking pin 9. Key C can thus lock the cylinder lock in this position.

The result is thus the desired situation that key A and B always locks, key D can only operate the case, and key C in the cylinder core position 1 does not lock, but locks in the cylinder core 2 position. However, only key A is able to rotate the collar 10 and thus produce the cylinder core position 1 or 2 cylinder core position. In addition to its blocking function, key A thus has the function of granting authorizations: If he brings the cylinder core and the adjusting ring into the cylinder core position 1, key C can not lock the cylinder lock. If he brings the cylinder core and the adjusting ring into the cylinder core position 2, key C can lock the cylinder lock.

Fig. 5 shows three-dimensional representations of a flat key 18 which is inserted into a cylinder lock according to the invention with a collar 10. At the first position along the flat key 18, a milling 19 is provided, the depth of which determines how far the setting pin 17 is moved. The adjusting ring 10 has an adjusting ring opening 11, which is designed as a slot, so that both the first blocking pin 8, as well as the staggered arranged second blocking pin 9 can be added. The offset is about 0.5mm along the direction of the keyway. In this illustration, numerous elements of the castle, in particular the other housing pins, not shown for reasons of clarity. These are located along the keyway in line with the first and second blocking pins, respectively.

Fig. 6 shows a further sectional view through a cylinder lock according to the invention 1. A cylinder core 3 is rotatably arranged in a cylinder housing 2. Key B is inserted into the cylinder core 3 and moves the adjusting pin 17 to the inner circumference of the adjusting ring 10. In the cylinder housing 2 first housing pin assemblies 6 and second housing pin assemblies 7 are provided which comprise a first blocking pin 8 and a second blocking pin 9, which springs 20 be kept under tension. In this case, the key B was used, and the cylinder core 3 can be rotated. However, the key can not be removed in the illustrated position, in which the position of the adjusting ring 10 deviates from the cylinder core pitch, since the two control slides 13 counteract a removal of the key. Only when the cylinder core 3 brought into a position is in which the control slide 13 engage in the appropriate exemptions 14 on the collar 10, the key can be removed.

This ensures that when removing a key cylinder core 3 and collar 10 always come to rest only in either cylinder core position 1 or 2 cylinder core position. An unintentional or abusive adjustment of the adjusting ring 10 is thereby prevented.

Fig. 7a - 7b and 8a - 8d show schematically a further embodiment of the invention. In this case, the adjusting ring opening 11 of the adjusting ring 10 is not in the form of a slot, but circular, and the second locking pin 9 is not offset from the adjusting pin 17a, but arranged flush with it. In order nevertheless to achieve the effect according to the invention that in the cylinder core position 2 in the case of the key C, the second blocking pin 9 hangs on the boundary between the adjusting ring 10 and the cylinder core 3, the second blocking pin 9 is specially shaped. The second blocking pin 9 has a base 15 whose outer diameter is greater than the diameter of the adjusting ring opening 11, and a nose 16 set thereon, whose diameter is smaller than the diameter of the adjusting ring opening 11. Further, the axial extent of the nose 16 is smaller than that Thickness of the adjusting ring 10 in the region of the adjusting ring opening 11. This ensures that the second blocking pin 9 can not protrude into the cylinder core 3 in any case and thus never blocks the cylinder core 3.

Fig. 8a - 8d shows a schematic section through an inventive cylinder housing 3 with the execution of the adjusting ring 10 and second locking pin 9 Fig. 7a - 7b , In Fig. 8a the key A is inserted, and the adjusting pin 17a is located on the outer periphery of the adjusting ring 10 (first dividing plane). The key locks and can assign permissions. In Fig. 8b key D is inserted, and the adjusting pin 17a is pressed to the bottom of the control groove 12, whereby the key can be rotated only in a - given by the angular range of the control groove 12 - angular range, for example, to operate the trap. In Fig. 8c key B is inserted, and the adjusting pin 17 a is pressed against the inner periphery of the adjusting ring 10. The cylinder core can be rotated independently of the blocking pins 8, 9 and locks the key.

Finally shows Fig. 8d the situation when inserting the key C: the adjusting pin 17a is not pressed to the inner periphery of the adjusting ring 10, yet the second locking pin 9 can not penetrate into the cylinder core 3, since it hangs on its base 15 on the adjusting ring opening 11, as in Fig. 7b clearly shown. Thus, also in this embodiment of the invention, the functionality that key A can assign and withdraw by turning the adjusting ring of cylinder core position 1 in the cylinder core position 2 and back the blocking authorization of the key C.

The invention is not limited to the illustrated embodiments, but includes all systems of cylinder locks and keys according to the following claims. In particular, the invention is not limited to the cylinder lock itself, but also includes a system of a cylinder lock according to the invention and matching flat keys.

LIST OF REFERENCE NUMBERS

1

cylinder lock

2

cylinder housing

3

cylinder core

4

Core pin bores

5

Housing pin holes

6

First housing pin arrangement

7

Second housing pin arrangement

8th

First locking pin

9

Second locking pin

10

collar

11

Collar opening

12

Kontrollnut

13

control Gates

14

exemption

15

base

16

nose

17

setting rod

17a

setting rod

18

flat key

19

milling

20

feather

Claims (18)

1. A system comprising a cylinder lock (1) and at least three keys, wherein

   - a first key always locks the cylinder lock (1) and is set up to assign a first locking authorization and at least a second locking authorization in the cylinder lock (1),

   - a second key always locks the cylinder lock (1) and cannot assign a locking authorization,

   - a third key locks the cylinder lock (1) when the first locking authorization is assigned and does not lock when the second locking authorization is assigned,

   wherein the assignment of the locking authorizations in the cylinder lock is performed mechanically by the first key.
2. The system according to claim 1, characterized in that a movable locking element is provided which can be moved by the first key reversibly from a first position corresponding to the first locking authorization into a second position corresponding to the second locking authorization.
3. The system according to claim 1 or 2, characterized in that the cylinder lock (1) is connected to a catch and a fourth key is provided which cannot assign authorizations, does not lock the cylinder lock (1), but can actuate the catch.
4. The system according to one of claims 2 to 3, characterized in that means are provided which allow removal of the first key in the first or second position and prevent removal of the other keys after the position of the locking element has changed.
5. The system according to one of claims 2 to 4, characterized in that a first housing pin arrangement (6) and a second housing pin arrangement (7) are provided, wherein the cylinder lock is configured in the first position for retrieving the first housing pin arrangement (6) and in the second position for retrieving the second housing pin arrangement (7).
6. A cylinder lock (1) for a system according to one of claims 1 to 5, comprising a cylinder housing (2) and a cylinder core (3) mounted rotatably therein, wherein core pin bores (4) with core pins are provided in the cylinder core and housing pin bores (5) with housing pins are provided in the cylinder housing, wherein

   - a first housing pin arrangement (6) and at least a second housing pin arrangement (7) are provided in the cylinder housing (2);

   • wherein the first housing pin arrangement (6) and the second housing pin arrangement (7) are arranged offset to one another,

   • the core pins in a first cylinder core position interact with the first housing pin arrangement and in a second cylinder core position interact with the second housing pin arrangement,

   • wherein the first housing pin arrangement comprises a first locking pin (8) and the second housing pin arrangement comprises a second locking pin (9) and

   • the core pins comprise an adjusting pin (17, 17a) which interacts with the first locking pin (8) and the second locking pin (9),

   - a rotatably arranged adjusting ring (10) is provided between the cylinder core and the cylinder housing, which ring has an adjusting ring opening (11) on its circumference, wherein the adjusting ring (10)

   • is movable back and forth between a first adjusting ring position for retrieving the first locking pin (8) in the first cylinder core position and

   • a second adjusting ring position for retrieving the second locking pin (9) in the second cylinder core position;

   - the locking pins (8, 9) are configured or arranged in such a manner that

   • the first locking pin (8) can penetrate the cylinder core (3) and lock it in the first adjusting ring position and

   • the second locking pin (9) cannot penetrate the cylinder core (3) and lock it in the second adjusting ring position,

   - at least one control slide (13) is provided in the cylinder core (3) which engages with the adjusting pin (17, 17a) at one end and with a free position (14) of the adjusting ring (10) at the other end.
7. The cylinder lock according to claim 6, characterized in that

   - the first locking pin (8) is arranged centred relative to the adjusting pin (17, 17a) in the first cylinder core position and

   - the second locking pin (9) is arranged offset relative to the adjusting pin (17, 17a) in the second cylinder core position.
8. The cylinder lock according to claim 7, characterized in that the adjusting ring opening (11) is configured as an elongate hole.
9. The cylinder lock according to claim 7, characterized in that

   - the first locking pin (8) has a diameter which is smaller than the diameter of the adjusting ring opening (11) and

   - the second locking pin (9) has a diameter which is greater than the diameter of the adjusting ring opening (11).
10. The cylinder lock according to claim 9, characterized in that the second locking pin (9) has an extension which extends over the diameter of the adjusting ring opening (11), at least sectionally, so that it cannot penetrate the cylinder core.
11. The cylinder lock according to claim 10, characterized in that the second locking pin (9) has a base (15), the diameter whereof is greater than the diameter of the adjusting ring opening (11), and a lug (16), the diameter whereof is smaller than the diameter of the adjusting ring opening (11), wherein the extension of the lug (16) is smaller than or equal to the thickness of the adjusting ring (10) in the region of the adjusting ring opening (11).
12. The cylinder lock according to one of claims 6 to 11, characterized in that a control groove (12) is provided on the inner circumference of the adjusting ring (10).
13. The cylinder lock according to claim 12, characterized in that the control groove (12) extends over an angle range of 90° to 270°, preferably 180°.
14. Use of a flat key (18) for assigning a first locking authorisation and at least a second locking authorization of a cylinder lock according to one of claims 6 to 13, wherein the flat key has a milled area (19) which presses the adjusting pin (17, 17a) of the cylinder lock onto the outer circumference of the adjusting ring (10).
15. A system according to one of claims 1 to 5 having a cylinder lock according to one of claims 6 to 13.
16. The system according to claim 15 having at least one flat key according to claim 14.
17. The system according to claim 15 or 16, characterized in that

    - a first flat key is provided, the milled area whereof is configured in such a manner that the adjusting pin (17, 17a) is pressed onto the outer circumference of the adjusting ring (10);

    - a second flat key is provided, the milled area whereof is configured in such a manner that the adjusting pin (17, 17a) is pressed onto the inner circumference of the adjusting ring (10);

    - a third flat key is provided, the milled area whereof is configured in such a manner that the adjusting ring (17, 17a) is not pressed up to the adjusting ring (10), but remains in the cylinder core.
18. The system according to claim 17, characterized in that a fourth flat key is provided, the milled area whereof is configured in such a manner that the adjusting pin (17, 17a) is pressed onto the groove base of the control groove (12).

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