LOCK CYLINDER, KEY AND KEY BLANK

Description

[0001] The present invention relates to a locking cylinder with a cylinder housing, a disc housing rotatably mounted in the cylinder housing about a cylinder axis, several rotatably mounted adjusting discs arranged in the disc housing along the cylinder axis, each adjusting disc having a receiving opening for a key, and a locking element which, viewed in a key insertion direction, is arranged in front of the adjusting discs and is rotationally fixed to the disc housing.

[0002] A lock cylinder with rotatable adjusting discs is also called a disc cylinder. Such a lock cylinder is disclosed in DE 10 2011 015 314 A1. A disc cylinder is also known from documents EP 0 712 979 B1, WO 2014026166 A2, US 4 195 503, DE 20 2007 002 699 U1, DE 198 44 593 C1, WO 2014072570 A1, DE 201 18 136 U1 and US 4 512 166.

[0003] According to Fig. 25 and 26A locking cylinder 10 can have a cylinder housing 12 and a cylinder core rotatably mounted in the cylinder housing 12 about a cylinder axis, which is hereinafter also referred to as a disc housing 14. The rotational movement of the cylinder core or the disc housing 14 can be transmitted via a coupling section 30 connected to the disc housing 14 to a locking mechanism of a lock (not shown) and the lock can thus be unlocked or locked by means of the locking cylinder 10.

[0004] The disc housing 14 contains several rotatable adjusting discs 16, also known as locking discs, arranged one behind the other along the cylinder axis. Each adjusting disc 16 has a central receiving opening 18, which together form a keyway 28 for inserting a key 24 and which, in the example shown, has a rectangular cross-section. The adjusting discs 16 also have circumferential recesses in the form of locking recesses 20 for receiving a locking pin 22, which is aligned parallel to the cylinder axis.

[0005] The locking pin 22 is radially movable in a slot 32 provided in the wall of the disc housing 14. When the locking cylinder 10 is in its locked position and thus the adjusting discs 16 are rotated into their locking position, the locking pin 22 assumes a radially outer blocking position. In this blocking position, a portion of the locking pin 22 engages in a locking pin receiving recess 34 provided on the inner wall of the cylinder housing 12, so that the disc housing 14 is blocked against rotation relative to the cylinder housing 12 (apart from a slight amount of rotational play).

[0006] The adjusting discs 16 can be moved from their locked position to an unlocked position using the key 24. When all adjusting discs 16 are in a so-called sorting position, which lies between the locked and unlocked positions, then the locking recesses 20 of all adjusting discs 16 are aligned with each other in the direction of the cylinder axis and radially with the locking pin 22.

[0007] In the lock cylinder 10 known from the prior art, the locking pin 22 can then be moved radially inwards into its release position, in which it is located outside the locking pin receptacle 34. This releases the disc housing 14 for rotational movement relative to the cylinder housing 12, and the disc housing 14, together with the adjusting discs 16, can be rotated further in the unlocking direction until the unlocked position is reached.

[0008] Furthermore, a fixing recess 44 for receiving a core pin 46 is provided on the outer circumference of each adjusting disc 16. The core pin 46 is aligned parallel to the cylinder axis and radially movable in a slot provided in the wall of the disc housing 14. In the locked position of the locking cylinder 10, the core pin 46 engages in the fixing recesses 44 of the adjusting discs 16 and thus prevents the adjusting discs 16 from rotating relative to each other when no key 24 is inserted.

[0009] The key 24 assigned to the lock cylinder 10 has several differently angled cuts 26, which correspond to the different angular positions of the locking recesses 20 of the adjusting discs 16. After insertion into the keyway 28, the key 24 initially assumes a so-called starting position, from which the key 24 can be rotated in the unlocking direction. By rotating the key 24 in the unlocking direction from the starting position, the key 24 first reaches a so-called zero position, in which the core pin 46 can disengage from the fixing recesses 44 of the adjusting discs 16 and the adjusting discs 16 are thus free for rotational movement relative to the disc housing 14 in order to align the locking recesses 20 of the adjusting discs 16 one after the other (so-called sorting).

[0010] The adjusting discs 16 have a certain rotational clearance relative to the respective assigned notch 26 of the key 24, the extent of which depends on the angle of the respective notch 26, i.e. depending on the angle of the notches 26, control sections of the respective notches 26 and corresponding control sections of the central receiving openings 18 of the respective assigned adjusting discs 16 engage with each other at different times or in different angular positions during sorting.

[0011] For example, starting from the zero position of the adjusting discs 16, the total rotation of the key until all adjusting discs 16 reach their sorting position is approximately 110°. This means that after a rotation of the key 24 by approximately 110°, all adjusting discs 16 are sorted and the locking recesses 20 are aligned radially with the locking pin 22. Typically, a grid of six different angular positions at equal intervals is provided for the possible angular positions of the locking recesses 20, with the angular distance between two adjacent locking recesses 20 in the grid being approximately 18°. Accordingly, there are six possible codings for each adjusting disc 16, whereby to set one of these codings, the respective adjusting disc 16 must be rotated by a specific angle from its zero position. In the example lock cylinder 10, a coding "1" corresponds to a rotation of the adjusting disc 16 by approximately...20°, an adjacent coding "2" of a rotation of approximately 38°, etc., and finally a coding "6" of a rotation of approximately 110°, each measured from the zero position until the sorting end position is reached. The locking recesses 20 are accordingly arranged at an angular distance from the locking pin receptacle 34 of the cylinder housing 12 corresponding to the respective coding when the adjusting discs 16 are in the zero position.

[0012] With coding "6", a forced coupling between the corresponding adjusting disc 16 and the associated section of the key 24 can be provided, i.e., there is no cut or a cut with an angle dimension of 0°, so that there is no play between the key 24 and the adjusting disc 16.

[0013] In coding "1", there is the greatest possible play between key 24 and adjusting disc 16; that is, key 24 has a notch 26 with an angle of approximately 90°. An adjusting disc 16 of coding "1" is therefore only engaged at the end of the key 24's rotation, i.e., after a turn of approximately 90°, and is then moved into its sorting position by a further turn of approximately 20° of key 24.

[0014] A disc cylinder can also have one or more so-called lifting discs, which are generally adjusting discs. Each lifting disc has the code "6" and is arranged in a predetermined axial position in the disc housing, e.g., at the very front, the very rear, or in the middle of the lock cylinder 10 with respect to the key insertion direction. The adjusting disc functioning as a lifting disc is positively coupled to the key 24. When the key is actuated in the unlocking direction, the lifting disc, after completing the sorting process (rotation by 110°), serves to couple the key 24 to the disc housing 14 and thus causes the disc housing 14 to rotate. Starting from the release position of the locking pin 22, when the key is actuated in the locking direction, the lifting disc ensures that the locking pin 22 is properly lifted from the locking recesses 20 of the adjusting discs 16 (i.e.,is forced into the locking pin recess 34) and is not tilted.

[0015] Furthermore, it is common practice to arrange intermediate discs 36 between the adjusting discs 16, which are coupled to the disc housing 14 either in a rotationally fixed manner or with rotational play. The intermediate discs 36 decouple adjacent adjusting discs 16 from one another, so that the rotational movement of one adjusting disc 16 does not cause the adjacent adjusting disc 16 to rotate due to friction. Such rotation could potentially lead to an adjusting disc 16 being rotated beyond its unlocking position, thus preventing the lock cylinder 10 from being opened.

[0016] The rotationally fixed coupling of the intermediate disks 36 with the disk housing 14 can be achieved by stop sections 40 of the intermediate disks 36 which extend at least partially in a radial direction ( Fig. 26 ), which lie against corresponding projections 42 formed on the inner wall of the disc housing 14.

[0017] Each intermediate disk 36 has a circumferential recess 38 that is radially aligned with the locking pin 22. Correspondingly, each intermediate disk 36 has a further circumferential recess 38a that is radially aligned with the core pin 46 and is preferably diametrically opposite the circumferential recess 38. The dimensions of the circumferential recess 38 are adapted to the diameter of the locking pin 22 so that the intermediate disks 36 do not impede the locking pin 22 from moving into its release position. The same preferably applies to the circumferential recess 38a with respect to the core pin 46.

[0018] Lock cylinders of the type described above have proven to be advantageously tamper-proof. Nevertheless, an unauthorized person could attempt, using a suitable picking tool, to scan the individual setting discs one after the other and thereby sort them sequentially, i.e., move them into their respective sorting positions, in order to then unlock the lock cylinder. Furthermore, an attempt could be made to determine the described coding of the setting discs, i.e., the respective angular position of the locking notches, in order to create a key with suitable cuts.

[0019] The present invention aims to improve a locking cylinder of the type described above in such a way that it offers improved protection against manipulation, such as picking. Furthermore, a key and a key blank adapted to such a locking cylinder are to be provided.

[0020] The problem is solved by a locking cylinder with the features of claim 1.

[0021] In the locking cylinder according to the invention, by turning the key in an unlocking direction, the locking element can be moved from a locked position, in which the locking element engages in a receiving recess of the cylinder housing, to a release position, in which the locking element is out of engagement with the receiving recess.

[0022] In the locking cylinder according to the invention, the locking element can be actuated by turning the key and thereby moved from the locked position to the released position. In the locked position, the locking element prevents the disc housing from rotating relative to the cylinder housing by engaging in a receiving recess on an inner wall of the cylinder housing. This locking effect can be released by turning the locking element with the appropriate key. However, simply inserting the key into the locking cylinder is not sufficient to actuate the locking element. Rather, it is necessary that the key is turned to actuate the locking element and that the key, in particular its tip, is adapted so that the locking element is actuated in the intended manner, i.e., moved into the released position.With an incorrect key that cannot actuate the locking element as intended, the lock cylinder cannot be unlocked. Since the locking element is located in front of the adjusting discs (and especially in front of the disc housing) when viewed in the key insertion direction, it is situated at the distal end of the disc housing when viewed from the key insertion point into the keyway. Therefore, the locking element is difficult to access, for example, with a picking tool. The lock cylinder thus offers improved protection against manipulation, particularly picking.

[0023] The locking element is subsequently referred to, particularly in the description of the figures, as a rotary sliding lock.

[0024] Where reference is made to the "insertion direction" of the key in connection with the invention, the terms "in front" or "front" generally denote a position located in the insertion direction and the terms "behind" or "back" denote a position located opposite the insertion direction.

[0025] The locking element can have a driven flank that interacts with a driven flank formed at the tip of the key in such a way that the locking element is moved from the locked position to the released position by turning the key in the unlocking direction. The locking element and the key tip can thus come into contact with each other via these flanks, so that turning the key in the unlocking direction moves the locking element into the release position.

[0026] Preferably, the output flank of the locking element and the drive flank at the tip of the key are adapted and interact in such a way that the two flanks only contact each other when the key has been rotated from an initial position, which the key assumes after being inserted into the lock cylinder, to at least a first rotational position. The first rotational position preferably corresponds to a rotational position that the key assumes shortly before reaching the final sorting position after passing the aforementioned zero position (in which the adjusting discs are free for rotation relative to the disc housing).

[0027] According to a further development of the invention, the output flank of the locking element and the drive flank at the tip of the key are adapted and interact with each other in such a way that the locking element moves from the locked position to the release position, while the key is rotated from the first rotational position in the unlocking direction to a second rotational position. The second rotational position is preferably the aforementioned sorting position, in which the adjusting discs are sorted and the locking recesses of the adjusting discs are aligned with each other in the direction of the cylinder axis.

[0028] The receiving openings of the adjusting discs, particularly together with at least one lifting disc, can form the aforementioned keyway in the initial position of the lock cylinder (preferably with a cross-sectional shape that is at least substantially rectangular), wherein the aforementioned drive flank of the locking element is preferably arranged outside the keyway, i.e., does not project into the keyway when viewed axially. Picking resistance can thus be increased, since the locking element is difficult to access and operate via the keyway.

[0029] The tip of the key preferably has a cross-sectional shape with two narrow sides and two broad sides, which are longer than the narrow sides, wherein the locking element can be driven by one of the broad sides of the key tip to move from the locked position to the unlocked position. The drive flank can thus be formed by one broad side of the key tip. According to one embodiment of the invention, when the key is turned in the unlocking direction from an initial position, which the key assumes after insertion into the lock cylinder, to a first or the aforementioned first rotation position, the locking element can be rotated such that the locking element initially remains in the locked position.Preferably, the receiving recess on the inner wall of the cylinder housing, into which the locking element engages in the locked position, is larger in the circumferential direction than the circumferential extent of the end of the locking element projecting into the receiving recess. According to the invention, the locking element thus has a rotational clearance relative to the cylinder housing in its locked position. This rotational clearance preferably exists starting from an initial position of the lock cylinder; that is, after inserting the key, the rotational clearance must first be overcome, and only then does further turning of the key cause the locking element to move from the locked position to the released position.

[0030] Preferably, the receiving recess on the inner wall of the cylinder housing has a first stop surface for an end of the locking element (in particular the end already mentioned) projecting into the receiving recess. The end of the locking element comes to rest against this stop surface when the key is rotated in the unlocking direction from an initial position, which the key assumes after insertion into the cylinder, to a first rotational position (in particular the first rotational position already mentioned). The first stop surface blocks further rotation of the locking element in the unlocking direction. Once the first rotational position is reached, the locking element must therefore be moved into the release position, because otherwise further rotation in the unlocking direction is not possible. Thus, the cylinder cannot be unlocked with an incorrect key that cannot actuate the locking element as intended.

[0031] The receiving recess of the cylinder housing preferably has a second stop surface for the end of the locking element projecting into the receiving recess, wherein the end of the locking element rests against the second stop surface when the key is removed, and the second stop surface prevents the locking element from rotating in the opposite direction to the unlocking direction. With the key removed, i.e., in the initial position, this results in a defined position for the locking element and the disc housing coupled to it.

[0032] According to a further development of the invention, the locking element is mounted so as to be displaceable in a plane normal to the cylinder axis. In particular, the locking element is movable from the locked position to the released position at least substantially in a direction transverse to the cylinder axis. The locking element can be mounted so as to be displaceable in a straight line with respect to the cylinder axis in a radial direction or in a direction parallel to a radial direction.

[0033] The locking element is preferably pre-tensioned in the direction of the locked position, in particular by means of a spring. This allows the locking element to be held in the locked position, especially when the key is removed.

[0034] According to a preferred embodiment of the invention, a further locking element, also referred to as a sliding lock, is arranged in front of the adjusting discs (and in particular in front of the disc housing) when viewed in the key insertion direction. The further locking element is thus located at the distal end of the disc housing. The further locking element is also preferably rotationally fixed to the disc housing.

[0035] Preferably, when the key is removed, the additional locking element assumes a locked position in which it engages in a further receiving recess on the inner wall of the cylinder housing. Furthermore, the additional locking element can be disengaged from this receiving recess and thus moved into a release position by inserting the key into the cylinder. Therefore, unlike the locking element described above, the additional locking element can be moved from the locked position to the release position simply by axially inserting the appropriate key.

[0036] The locking element (in particular the aforementioned rotary sliding lock) and the further locking element (in particular the aforementioned sliding lock) are preferably arranged side by side in the same cross-sectional plane of the locking cylinder (i.e., at the same height along the cylinder axis) and mounted so that they can be displaced parallel to each other. This allows two different locking and unlocking functions to be implemented with a short overall length, i.e., with limited axial space for the locking cylinder, which become effective at different times or in different positions of the locking cylinder.

[0037] The further locking element is preferably also pre-tensioned in the direction of its locking position, in particular by means of a spring.

[0038] According to a preferred embodiment of the invention, each adjusting disc of the locking cylinder has a locking recess on its outer circumference for at least partially receiving a locking pin aligned parallel to the cylinder axis and, offset from the locking recess, a fixing recess provided on the outer circumference for at least partially receiving a core pin aligned parallel to the cylinder axis, wherein the adjusting discs can be rotated from a starting position with the key removed into a sorting position by turning the inserted key in the unlocking direction, in which the locking recesses of all adjusting discs are aligned with each other when viewed in the direction of the cylinder axis, wherein in the sorting position the fixing recesses of all adjusting discs are aligned with each other when viewed in the direction of the cylinder axis, and wherein the locking cylinder is designed such thatthat when the adjusting discs are further rotated from the sorting position in the unlocking direction, first the core pin enters the fixing recesses and only then the locking pin enters the locking recesses.

[0039] In this cylinder lock, the locking recesses of all adjusting discs are aligned with each other in the sorting position, in the direction of the cylinder axis. However, the locking pin does not immediately engage the locking recesses of the adjusting discs in the sorting position. Instead, it only engages when the adjusting discs are rotated further in the unlocking direction beyond the sorting position, after the core pin has penetrated the fixing recesses of the adjusting discs. In other words, the engagement of the core pin in the fixing recesses and the engagement of the locking pin in the locking recesses are sequentially defined. The core pin engaging the fixing recesses locks the adjusting discs against each other (and relative to the disc housing), so that once the sorting position is reached and a slight further rotation in the unlocking direction is achieved, they can no longer be rotated individually (i.e., relative to each other).Picking the lock cylinder by individually rotating the setting discs with a picking tool and recognizing that the sorting position is reached when the locking pin engages in the locking recesses aligned with the locking pin is therefore no longer possible. In particular, this prevents the locking pin from being forced radially inwards by applying torque and simultaneously prevents the locking pin from being felt against the lateral boundary of the locking recess of a single setting disc by rotating it, thus preventing the coding of the individual setting discs from being read sequentially.

[0040] Preferably, the aforementioned locking recess of a respective setting disc, into which the core pin engages in the sorting position, is one of several identically designed locking recesses arranged side by side on the outer circumference of the respective setting disc. The locking recesses, or the radially outwardly projecting transition areas between two respective locking recesses, can serve as chatter marks when the respective setting disc is rotated. Furthermore, the locking recesses are unsuitable for picking attempts, since, due to the multiple locking recesses present in a setting disc, the "correct" position of the setting disc cannot be determined based on the locking recesses. The locking cylinder is thus characterized by a particularly high level of protection against manipulation and, in particular, against picking.

[0041] By engaging the locking recesses of the adjusting discs, the core pin can move inwards, thereby fixing the adjusting discs relative to the disc housing. This also releases any rotational restriction of the disc housing relative to the cylinder housing caused by the core pin. Subsequent engagement of the locking pin in its locking recesses allows the locking pin to move radially inwards, further releasing any rotational restriction of the disc housing relative to the cylinder housing caused by the locking pin. Once the core pin and locking pin are engaged, the disc housing, together with the adjusting discs, can be rotated further in the unlocking direction until it reaches the unlocked position.

[0042] In order to achieve a defined sequence of movements, a positive guidance is preferably provided for both the described penetration of the core pin into the fixing recesses and the described penetration of the locking pin into the locking recesses, i.e. the core pin is forced into the fixing recesses and the locking pin is forced into the locking recesses.

[0043] Preferably, in the sorting position of the adjusting discs, the core pin engages in a core pin receptacle provided on the inner wall of the cylinder housing, and the lock cylinder is designed so that, when the key is turned from the sorting position in the unlocking direction, the core pin is forced radially inward into the fixing recesses. By engaging the core pin receptacle, the core pin prevents the disc housing from rotating relative to the cylinder housing. This blockage is released once the core pin has moved radially inward into the fixing recesses. The core pin's engagement in the fixing recesses secures the adjusting discs relative to the disc housing, preventing them from rotating individually. Only the disc housing and the adjusting discs together can be rotated in the unlocking direction.

[0044] In particular, the core pin receptacle or the cylinder housing can have a core pin guide chamfer that, viewed in the unlocking direction, limits the core pin receptacle and is adapted to press the core pin radially inwards into the fixing recesses. The core pin guide chamfer ensures that, at a defined angular position, the core pin is pressed into the fixing recesses beyond the sorting end position after the key or the disc housing has been turned further. The transmission of the key's rotational movement to the disc housing can be achieved via a stop on a lifting disc and / or via a respective stop on the adjusting discs.

[0045] According to a preferred embodiment of the invention, the locking cylinder is adapted such that, in the sorting position of the adjusting discs, the locking pin engages in a locking pin receptacle provided on the inner wall of the cylinder housing, and that, after the core pin has been forced into the fixing recesses, further rotation of the key in the unlocking direction forces the locking pin radially inward into the locking recesses. By engaging the locking pin in the locking pin receptacle, the locking pin secures the disc housing to the cylinder housing against rotation. Once the locking pin has been forced radially inward, the disc housing can be further rotated relative to the cylinder housing in the unlocking direction until the unlocked position is reached.

[0046] Preferably, a locking pin guide chamfer is provided on the cylinder housing, limiting the locking pin receiving recess in the unlocking direction, which pushes the locking pin radially inwards beyond the sorting end position when the key or the disc housing is turned further in the unlocking direction.

[0047] The chamfered guide for the locking pin makes it easy to ensure that the locking pin is guided radially inwards at a defined angle of rotation.

[0048] Preferably, viewed in the direction of rotation, the core pin receptacle of the cylinder housing, into which the core pin engages in the sorting position, extends over a smaller circumferential angle than the locking pin receptacle of the cylinder housing, into which the locking pin engages in the sorting position. Starting from the sorting position of the adjusting discs, the locking pin can therefore have greater rotational play within the locking pin receptacle in the unlocking direction than the core pin within the core pin receptacle.

[0049] This differential play in rotation exists, starting from the sorting position, particularly in the unlocking direction. Here, the core pin receiving recess can be limited in the unlocking direction by the aforementioned core pin guide chamfer, and the locking pin receiving recess of the cylinder housing can be limited in the unlocking direction by the aforementioned locking pin guide chamfer, whereby in the sorting position the angular distance between the core pin and the core pin guide chamfer is smaller than the angular distance between the locking pin and the locking pin guide chamfer.

[0050] Preferably, the core pin receptacle and the locking pin receptacle are located at least substantially diametrically opposite each other with respect to the cylinder axis. Similarly, the core pin and the locking pin are preferably located at least substantially diametrically opposite each other.

[0051] Preferably, at least one lifting disc is provided, which is arranged parallel to the adjusting discs and rotatably mounted in the disc housing, and which also has a (particularly central) receiving opening for the key, wherein the lifting disc is positively coupled to the inserted key with respect to any rotation of the key. The positive coupling between the key and the lifting disc can be achieved, in particular, by the lifting disc and the associated key notch having the coding "6" described above. Thus, there is no play between the key and the lifting disc. Therefore, when the key is turned, the lifting disc always rotates with it.

[0052] Preferably, this lifting disc is arranged in front of the adjusting discs in the disc housing when viewed in the key insertion direction, i.e., in the area of ​​the distal end of the lock cylinder facing away from the key insertion opening. However, the lifting disc can also be arranged at another location in the disc housing, e.g., behind the adjusting discs or in the middle between the adjusting discs.

[0053] Like the adjusting discs, the lifting disc preferably has at least one fixing recess on its outer circumference for at least partially receiving the core pin. Preferably, the lifting disc, like the adjusting discs, has several adjacent fixing recesses in the circumferential direction, which can also function as chatter marks when the adjusting discs or the lifting disc are rotated.

[0054] According to an advantageous embodiment, a control element is associated with the lifting disc, which is mounted in a slot in the disc housing, wherein the control element can be movable, in particular in the radial direction. By means of such a control element, the lifting disc can be used to control various coupling and decoupling movements with high accuracy.

[0055] Preferably, the lifting disc has a control recess on its outer circumference for at least partially receiving the control element. By engaging the control element in the control recess, the lifting disc can be selectively fixed to the disc housing, so that the lifting disc and the disc housing can only be rotated together.

[0056] Preferably, in the initial position (i.e., with the key removed), the control element engages in the control recess of the removal disc. In this initial position, the control element thus secures the disc housing and the removal disc together. The removal disc therefore has a defined orientation in the initial position, allowing the key to be inserted easily. Additionally, the core pin may engage in a fixing recess of the removal disc in the initial position, thereby also securing the removal disc to the disc housing.

[0057] According to one embodiment of the invention, the disc housing and the lifting disc (particularly together with the adjusting discs) can be rotated from an initial position, i.e., with the key inserted but not yet turned, in the unlocking direction to a zero position. In this position, the control element penetrates radially outwards into a control element receiving recess formed on the inner wall of the cylinder housing and disengages from the control recess of the lifting disc. The penetration of the control element into the control element receiving recess fixes the disc housing in the zero position relative to the cylinder housing. Furthermore, the fixation between the disc housing and the lifting disc effected by the control element between the initial position and the zero position is released as soon as the control element disengages from the control recess of the lifting disc.Preferably, in the zero position, the core pin can also be disengaged from the aforementioned fixing recess of the lifting disc by being forced radially outward into the aforementioned core pin receiving recess of the cylinder housing. This eliminates any blockage of rotation of the lifting disc relative to the disc housing caused by the core pin. The lifting disc can therefore be rotated relative to the disc housing in the unlocking direction, starting from the zero position.

[0058] The lifting disc and the control element thus allow the zero position, which relates to the sorting of the adjusting discs, to be easily set or controlled.

[0059] Preferably, the lifting disc is rotatable from the zero position to the sorting position relative to the disc housing, while the disc housing is fixed to the cylinder housing, particularly by the engagement of the control element in the control element receptacle. The key, which is positively coupled to the lifting disc, can thus be further rotated from the zero position to the sorting position. Upon reaching the sorting position, all adjusting discs are sorted, i.e., the locking recesses of the adjusting discs are aligned with each other.

[0060] According to a preferred embodiment of the invention, the lifting disc has a circumferential recess on its outer circumference for at least partially receiving the control element. In particular, the circumferential recess is offset in the circumferential direction from the aforementioned control recess on the outer circumference of the lifting disc, wherein the circumferential recess forms a further control recess.

[0061] Preferably, in the sorting position (and preferably already during the sorting of the adjusting discs), the control element engages in a control element receiving recess formed on the inner wall of the cylinder housing, which preferably corresponds to the aforementioned control element receiving recess. In the sorting position, the circumferential recess of the lifting disc is aligned radially with the control element to partially receive the control element. The engagement of the control element in the control element receiving recess fixes the disc housing to the cylinder housing in the sorting position.

[0062] Preferably, the locking cylinder is adapted such that the control element – ​​in particular by rotating the lifting disc in the unlocking direction from the sorting position – is forced radially inwards into the circumferential recess of the lifting disc. The control element thereby disengages from the control element receiving recess, thus releasing the locking of the disc housing to the cylinder housing caused by the control element. Furthermore, the control element engages with the circumferential recess, thereby locking the lifting disc to the disc housing.

[0063] A control element guide chamfer is particularly preferred on the cylinder housing (especially on the inner wall of the cylinder housing), which limits the control element receiving recess in the unlocking direction. When the lifting disc is rotated in the unlocking direction from the sorting end position, this chamfer forces the control element radially inward into the circumferential recess of the lifting disc. The control element can thus be easily disengaged from the control element receiving recess, forced radially inward, and brought into engagement with the circumferential recess of the lifting disc. This allows, after reaching the sorting end position, control of the timing or angular position for decoupling the disc housing from the cylinder housing or for coupling the disc housing to the lifting disc and thus to the key.

[0064] According to a further development of the invention, the control element receiving recess provided on the cylinder housing extends, in the unlocking direction, over a circumferential angle that is less than or at most as large as the circumferential angle of a core pin receiving recess provided on the cylinder housing (in particular the core pin receiving recess already mentioned), into which the core pin engages in the sorting end position. In the sorting end position, the core pin receiving recess therefore offers at least the same rotational play for the core pin as the control element receiving recess for the control element, so that the described sequence control is determined by the interaction of the control element with the control element receiving recess.

[0065] This differential play in rotation exists particularly when starting from the sorting end position in the unlocking direction. Here, the control element receiving recess of the cylinder housing can be limited in the unlocking direction by the aforementioned control element guide chamfer, and the core pin receiving recess can be limited in the unlocking direction by the aforementioned core pin guide chamfer, wherein, in the sorting end position, the angular distance between the control element and the control element guide chamfer corresponds at most to the angular distance between the core pin and the core pin guide chamfer, and wherein the former is preferably less than the latter.

[0066] According to a preferred embodiment of the invention, the lifting disc has a stop on its outer circumference which, when the lifting disc is rotated from its initial position in the unlocking direction, comes into contact with a counter-stop provided on the disc housing upon reaching the sorting end position. By continuing to rotate the lifting disc in the unlocking direction from the sorting end position, the disc housing is rotated due to the interaction between the stop and counter-stop. This rotational movement disengages the control element from the control element receptacle in the inner wall of the cylinder housing and engages it with the circumferential recess of the lifting disc. Furthermore, the core pin is forced radially inward, disengaging it from the core pin receptacle and engaging it with the fixing recess provided on the outer circumference of the lifting disc.Furthermore, the core pin engages with the locking recesses of the adjusting discs, which are aligned in the sorting position. Thus, when the key is turned beyond the sorting position, the core pin can lock all adjusting discs against rotation on the disc housing. Only then – when the adjusting discs are turned further in the unlocking direction – can the locking pin be forced radially inwards from the locking pin receptacle into the locking recesses of the adjusting discs, thereby allowing further rotation of the adjusting discs and the disc housing until the unlocking position is reached.

[0067] Alternatively or additionally, the lifting disc has a further stop on its outer circumference. When the lifting disc is rotated back from the sorting end position in the locking direction (especially when reaching the aforementioned zero position), this stop comes into contact with a further counter-stop provided on the disc housing. By continuing to rotate the lifting disc in the locking direction (especially from the zero position), the disc housing can be rotated along with it due to the interaction between the further stop and the further counter-stop. This rotation of the disc housing disengages the control element from the control element receptacle in the inner wall of the cylinder housing and engages it with the control recess of the lifting disc.Furthermore, the core pin can be forced radially inwards out of the core pin receptacle, so that it disengages from the receptacle and engages with the retaining recess on the outer circumference of the removal disc. In doing so, the core pin also engages with the retaining recesses of the adjusting discs (aligned in the zero position and radially aligned with the core pin receptacle when viewed from the outside). As the key is turned further in the locking direction beyond the zero position, the core pin secures all adjusting discs to the disc housing, preventing them from rotating. The disc housing, with the adjusting discs secured to it by the core pin and the removal disc secured to it by the control element and the core pin, can then be turned back to the initial position, allowing the key to be removed.

[0068] The control element can be, in particular, a pin-like control element, such as a control pin, which is preferably aligned parallel to the cylinder axis. However, the control element can also be, for example, a sphere.

[0069] The control element is preferably offset along the cylinder axis with respect to the locking pin, but arranged in the same angular position; that is, viewed along the cylinder axis, the control element is at least substantially aligned with the locking pin (apart from a possible radial offset). In this respect, a two-part control pin arrangement is provided, comprising the locking pin and the separate, independently movable control element. In particular, the control element, designed as a pin, can be received in the same slot of the disc housing as the locking pin. The locking pin thus interacts with the locking recesses of the adjusting discs, but not with the lifting disc described above. However, it can certainly interact with at least one other lifting disc.

[0070] In contrast, the core pin preferably interacts with both the lifting disc and the adjusting discs. The slot in the disc housing for receiving the locking pin and the control element can preferably (as can preferably be the slot in the disc housing for receiving the core pin) be designed as an opening in the disc housing extending in the direction of the cylinder axis.

[0071] With the key inserted, the disc housing and the adjusting discs (which are coupled to the disc housing in particular via the core pin) are preferably rotatable together in the unlocking direction from the starting position to a zero position or the zero position already mentioned.

[0072] The adjusting discs can be individually rotated between the zero position and the sorting position relative to the disc housing in a manner known per se. By rotating the key between the zero position and the sorting position, the adjusting discs can be sorted in a manner known per se. In the sorting position, the locking recesses and the fixing recesses of all adjusting discs are aligned with each other when viewed along the cylinder axis. Furthermore, in the sorting position, the locking recesses of the adjusting discs are radially aligned with the locking pin receptacle of the cylinder housing, and the fixing recesses of the adjusting discs, which are aligned along the cylinder axis, are radially aligned with the core pin receptacle of the cylinder housing.

[0073] The invention also relates to a key or key blank for a locking cylinder of the type described, comprising a shaft whose tip is adapted to interact with a locking element provided in the locking cylinder, wherein the shaft has two broad sides and two narrow sides, wherein the shaft tip has two broad sides, two narrow sides and an end face, and wherein at least one broad side of the shaft tip has a flattened area set back relative to a plane of the broad side of the shaft.

[0074] The flattening at the tip of the shaft allows the key to be inserted into a corresponding keyway in the cylinder's initial position (corresponding to the aforementioned initial position) without the shaft tip contacting a locking element of the type described above (especially the aforementioned rotary slide lock). Nevertheless, the locking element can have a drive flank that extends relatively close to the cylinder axis for rotary actuation of the locking element by the key. After inserting the key into the cylinder, or...In the aforementioned keyway, a drive flank of the shaft tip, which may be located laterally adjacent to the flattening of the shaft tip and / or in the plane of the corresponding shaft broad side, can thus come into contact with the output flank of the locking element when the key is turned in the lock cylinder, in order to move the locking element into the release position.

[0075] In the area of ​​the respective flattening, the broad side of the shank tip can be set back relative to the plane of the shank's broad side. The plane of the shank's broad side is preferably a plane overlapping the outer elements of the shank's broad side. Recesses, such as a longitudinal groove in the broad side, are set back relative to this overlapping plane towards the key axis and therefore do not lie in the aforementioned plane of the shank's broad side.

[0076] The flattening is preferably formed along the key axis across the entire broad side of the shank tip. However, the flattening can also be formed only across a portion of the broad side of the shank tip when viewed in the direction of the key axis.

[0077] In a direction transverse to the key axis, the flattening preferably extends only over a part of the broad side of the shank tip, while another part of the broad side of the shank tip (in particular the entire or almost the entire remaining part) may lie in the plane of the corresponding broad side of the shank.

[0078] According to a further embodiment, the flattening can extend in a direction transverse to the key axis only over a portion of the broad side of the shaft tip, while another portion of the broad side of the shaft tip (in particular, the entire or nearly the entire remaining portion) forms the aforementioned drive flank of the shaft tip (or key tip) for moving the locking element by turning the key. Here, the drive flank can, as explained above, lie in the plane of the corresponding broad side of the shaft. Alternatively or additionally, in this embodiment, the drive flank of the shaft tip can extend in a direction transverse to the key axis only over a portion of the broad side of the shaft tip comprising a proportion in the range of approximately 10% to 50%, in particular a proportion in the range of approximately 20% to 40%, and preferably a proportion of approximately 10% to 50%.30% of the total width of the respective broad side of the shaft tip corresponds to this (these are approximate figures with regard to rounded edges and / or transitions). In other words, the drive flank preferably extends in the transverse direction over no more than half the width of the respective broad side of the shaft tip.

[0079] However, the flattening can generally extend across the entire broad side of the shaft tip in a transverse direction.

[0080] The flattening can run parallel to the plane of the shaft's broad side. Alternatively, the flattening can run obliquely to the plane of the shaft's broad side. Or, the flattening can run partly parallel and partly obliquely to the plane of the shaft's broad side.

[0081] Preferably, the flattening is inclined relative to the plane of the broad side of the shaft by a predetermined angle, wherein the angle is preferably in the range between 2 and 25 degrees, more preferably between 5 and 20 degrees and even more preferably between 10 and 15 degrees (including the limits of the range in each case).

[0082] According to a preferred embodiment of the invention, a flattened section is provided on each of the two broad sides of the shaft tip, the two flattened sections preferably being rotationally symmetrical to each other. The key can preferably be designed in the form of a reversible key. According to a further development of the invention, the two narrow sides of the shaft tip taper obliquely towards the end face. The narrow sides thus converge towards the end face in a roof-like manner. This results in a pointed shape at the front end, which makes it easier to insert the key into the keyway.

[0083] The tip of the shaft can be set off from the rest of the shaft by a circumferential notch on its narrow sides. This results in a defined tip that is clearly delineated from the rest of the shaft. Preferably, the notch is spaced between 1 mm and 3 mm from the front end of the tip.

[0084] In the front part of the shaft, near the tip, an additional circumferential notch may be formed on the narrow sides. When the key is turned from its initial position in the unlocking direction, a corresponding locking disc within the cylinder can engage in this additional notch. If this additional notch is not present, the locking disc blocks the rotation, thus further increasing the resistance to manipulation through the combination of the additional notch and the corresponding locking disc. This additional notch may be located between 3 mm and 5 mm from the front end of the shaft tip.

[0085] Further advantageous embodiments of the invention are specified in the dependent claims, the description and the drawings.

[0086] The invention is explained below with reference to an exemplary embodiment and the drawings. The drawings show: Fig. 1 is an exploded view of a locking cylinder according to the invention with associated key, Fig. 2a and 2b are perspective views of the key. Fig. 1 or a front view of the key tip, Fig. 3 a partially cutaway side view of the lock cylinder of Fig. 1 with key inserted, Figs. 4 to 6 a cross-sectional view through the lock cylinder of Fig. 1 in a starting position with the key removed, at the level of a rotary sliding lock, or at the level of a front lifting disc, or at the level of a rear lifting disc, Figs. 7 to 9 a cross-sectional view through the lock cylinder of Fig. 1 in an initial position with the key inserted and not yet turned, at the level of the rotary slide lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Figs. 10 to 12 a cross-sectional view through the lock cylinder of Fig. 1 With the key turned to the zero position, at the level of the rotary slide lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Figs. 13 to 15 show a cross-sectional view through the lock cylinder. Fig. 1 With the key turned into a sorting position, at the level of the rotary sliding lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Figs. 16 to 18 show a cross-sectional view through the lock cylinder. Fig. 1 With the key turned to an unlocking position, at the level of the rotary slide lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Figs. 19 to 21 show a cross-sectional view through the lock cylinder. Fig. 1 With the key turned to an unlocked position, at the level of the rotary slide lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Figs. 22 to 24 show a cross-sectional view through the lock cylinder. Fig. 1 with the key turned to an unlocking position, at the level of the rotary slide lock, or at the level of the front lifting disc, or at the level of the rear lifting disc, Fig. 25 a longitudinal section through a lock cylinder known from the prior art, and Fig. 26 an exploded view of the lock cylinder of Fig. 25 .

[0087] The locking cylinder 100 according to the invention Fig. 1 The assembly comprises a cylinder housing 12, a disk housing 14 rotatably mounted in the cylinder housing 12 about a cylinder axis, and several rotatably mounted adjusting disks 16 arranged along the cylinder axis in the disk housing 14, between each of which an intermediate disk 36, in particular a floating disk, is arranged. A stop device (not shown) can be provided to prevent the intermediate disks 36 from rotating.

[0088] Each adjusting disc 16 and each intermediate disc 36 has a central receiving opening 18, which together form a keyway 28 for inserting a key 24. In the illustrated embodiment, the central receiving openings 18 of the adjusting discs 16 have a rectangular cross-section, whereas the receiving openings 18 of the intermediate discs 36 have a circular cross-section.

[0089] Each adjusting disk 16 has a locking recess 20 on its outer circumference for receiving a locking pin 22, which is aligned parallel to the cylinder axis and is radially movable in a slot provided in the wall of the disk housing 14 (in Fig. 1 (not shown) is mounted. Each adjusting disk 16 also has, offset from the locking recess 20 on its outer circumference, at least one fixing recess 44 for receiving a core pin 46 aligned parallel to the cylinder axis. The core pin 46 is also radially movable in a slot provided in the wall of the disk housing 14, which is Fig. 1 Not shown, recorded.

[0090] The disc housing 14 includes a front lifting disc 48 – viewed in the insertion direction A of the key 24 into the keyway 28 – which is rotatably mounted parallel to the adjusting discs 16 in the disc housing 14 and also has a central receiving opening 18 for the key 24. The front lifting disc 48 is thus located at the distal end of the disc housing 14, viewed from the opening of the keyway 28. The front lifting disc 48 is positively coupled to the key 24 inserted into the keyway 28 with respect to rotation. The front lifting disc 48 therefore always rotates when the key 24 is turned.

[0091] The same applies to a rear lifting disc 50, which is rotatably mounted in the disc housing 14 behind the stack of adjusting discs 16 (i.e., at the proximal end of the disc housing 14) with respect to the insertion direction A. An intermediate disc 36, in particular a floating disc, is arranged between the adjacent adjusting disc 16 and the rear lifting disc 50, as shown. Fig. 1 shows.

[0092] The disc housing 14 is also closed with a cover 52, which protects the discs 16, 36, 48, and 50 from falling out of the disc housing 14. Like the lifting discs 48 and 50, the adjusting discs 16, and the intermediate discs 36, the cover 52 also has a central receiving opening 18 for forming the keyway 28.

[0093] In contrast to the one relating to the Fig. 25 and 26 described lock cylinder 10, in which the locking pin 22 is connected to the Fig. 25 and 26The front lifting disc, not shown, interacts with the lock cylinder 100. Fig. 1 A separate control element 54, designed in the form of a control pin, is provided. The control element 54 is located at the level of the front lifting disc 48 and thus adjacent to the locking pin 22 in the insertion direction A of the key 24, and is radially movably arranged in a separate slot of the disc housing 14 or in the same slot in which the locking pin 22 is located. The control element 54 can, for example, also be designed as a ball. The front lifting disc 48 has a control recess 70 on its outer circumference ( Fig. 5, 8 , 11 ) and a further exemption 108 serving as a comprehensive exemption ( Fig. 14 , 17, 20, 23 ) to pick up control element 54.

[0094] Viewed in the insertion direction A of the key 24, in front of the disc housing 14 (i.e. offset distally) within the same plane, a first locking element formed by a so-called sliding lock 56 and a second locking element formed by a so-called rotary sliding lock 58 are arranged, which are mounted in a normal plane to the cylinder axis parallel to a radial direction with respect to the cylinder axis in a translational (i.e. straight-line) manner.

[0095] How Fig. 1 As shown, the disc housing 14 also has a receiving opening 18 at its front end, as seen in the insertion direction A of the key 24, through which a tip 60 of the key 24 (cf. Fig. 1 and 2 ) when the key is inserted into the keyway 28. As explained below, the sliding lock 56 and the rotary sliding lock 58 can be operated via the key tip 60.

[0096] An attachment 62 is mounted on the front end of the disc housing 14 as viewed in the key insertion direction A. The attachment 62 serves as a receptacle and translational guide for the sliding lock 56 and the rotary sliding lock 58, as well as a connecting element to a Fig. 1 not shown locking mechanism, so that it can be operated by turning the disc housing (see coupling section 30 in Fig. 25 ).

[0097] Clamps 64 are provided to hold the attachment 62 on the disk housing 14, with which the attachment 62 can be clamped to the disk housing 14, in particular on opposite sides.

[0098] The Fig. 2a The illustrated key 24 has several differently angled cuts 26, which correspond, in a manner known per se, to different angular positions of the locking recesses 20 and the fixing recesses 44 of the adjusting discs 16. The adjusting discs 16 have a specific rotational clearance relative to their respective assigned cut 26 of the key 24, the extent of which depends on the angle of the respective cut 26. Depending on the angle of the cuts 26, the control sections (flanks) of the respective cuts 26 and the corresponding control sections (inner walls) of the central receiving openings 18 of the respective assigned adjusting discs 16 thus engage at different times and according to the coding provided in the respective cut 26, as already described above with reference to the Fig. 25 and 26 was described.

[0099] The front lifting disc 48 and the rear lifting disc 50 have the coding "6", so that the two lifting discs 48 and 50 are forcibly coupled with the key 24 with respect to a rotation.

[0100] The Fig. 3 shows a longitudinal section through the disc housing 14 and in particular the two lifting discs 48, 50 with the intermediate adjusting discs 16, the locking pin 22, the core pin 46, the control element 54 as well as the sliding lock 56 cooperating with the key tip 60 and the rotary sliding lock 58 also cooperating with the key tip 60.

[0101] With regard to the Fig. 4 bis 24 The following describes the function of the 100 locking cylinder. Fig. 1 explained. Fig. 4 bis 6 The images depict the situation with the key removed from different viewing angles (each viewed from the opposite direction to the key insertion A), which is subsequently referred to as the initial position. Fig. 4 Figure 1 shows a cross-section through the lock cylinder at the level of the rotary slide lock 58 and the sliding lock 56. In its initial position, the rotary slide lock 58 is locked because it engages in a rotary slide lock receptacle 66 provided on the inner wall of the cylinder housing 12. Similarly, the sliding lock 56 is locked because it engages in a sliding lock receptacle 68 provided on the inner wall of the cylinder housing 12. Both the rotary slide lock 58 and the sliding lock 56 are biased in the direction of their respective locking positions by means of a spring (not shown). However, the sliding lock 56 and the rotary slide lock 58 perform different functions, as they are effective as locking elements at different times.

[0102] Fig. 7 shows the same cross-sectional plane as Fig. 4 , however, with key 24 inserted but not yet turned, i.e., in the so-called starting position. How Fig. 7 shown, is achieved by inserting the key 24 into the key channel 28 (cf. Fig. 1 ) the sliding lock 56 is actuated by the key tip 60 in such a way that the sliding lock 56 is forced out of the sliding lock receptacle 68 in a direction transverse to the cylinder axis and is thereby moved from the locked position to a released position. In the initial position according to Fig. 4 The blocking of the disc housing 14, with respect to the unlocking direction D caused by the sliding lock 56, to which the sliding lock 56 is rotationally fixedly coupled via the attachment 62, relative to the cylinder housing 12, is therefore lifted by inserting the key 24 into the key channel 28.

[0103] How Fig. 7 as also shows, is achieved simply by inserting the key 24 into the key channel 28 (cf. Fig. 1 The rotary slide lock 58 has not yet been actuated by the key tip 60. In the initial position with the key 24 inserted, the rotary slide lock 58 is therefore still in the locked position and thus engages in the rotary slide lock receptacle 66 of the cylinder housing 12.

[0104] The Fig. 5 In its initial position, it shows a cross-section through the lock cylinder 100. Fig. 1 at the level of the front lifting disc 48. As the Fig. 5 As shown, the control element 54 is arranged in a slot provided in the disc housing 14 and, in its initial position, engages in the control recess 70 of the front lifting disc 48. This secures the disc housing 14 and the front lifting disc 48 against each other.

[0105] As the Fig. 5 Furthermore, the core pin 46 is also arranged in a slot of the disc housing 14 and engages in a fixing recess 72, which is formed on the outer circumference of the front lifting disc 48. The core pin 46 thus also fixes the front lifting disc 48 relative to the disc housing 14. As the Fig. 5 As shown, several adjacent fixing recesses 72 are provided on the outer circumference of the front lifting disc 48, viewed in the circumferential direction, which can also serve as chatter marks when the front lifting disc 48 is rotated relative to the core pin 46.

[0106] The Fig. 8 shows the same cross-sectional plane as the Fig. 5 , however, in the initial position with the key 24 inserted and not yet turned. As a comparison of the Fig. 5 und 8 As shown, inserting the key 24 into the lock cylinder does not yet cause any change in the depicted cross-sectional plane.

[0107] The Fig. 6 shows a cross-section through the lock cylinder of the Fig. 1 at the level of the rear lifting disc 50 in the starting position. The core pin 46 also engages in a fixing recess 72 of the rear lifting disc 50 in the starting position, wherein – as with the front lifting disc 48 – several fixing recesses 72 are also formed next to each other in the circumferential direction on the outer circumference of the rear lifting disc 50. In the corresponding manner as in the Fig. 5 und 6 As shown for the front lifting disc 48 and the rear lifting disc 50, the core pin 46 also engages in corresponding fixing recesses 44 (see figure). Fig. 1 ), which are provided in the adjusting discs 16 (and preferably also in the intermediate discs 36) (see the fixing recesses 44 in Fig. 26 ), so that the core pin 46, in its initial position, also secures the adjusting discs 16 against rotation relative to the disc housing 14. The adjusting discs 16 cannot be individually rotated relative to the disc housing 14 in their initial position, thus providing effective protection against picking. Furthermore, unintentional rotation of the adjusting discs 16 and the lifting discs 48, 50 is prevented, ensuring that the key 24 can be inserted into the keyway 28.

[0108] As the Fig. 6 Furthermore, it shows that the (in axial alignment to the control element 54 according to Fig. 5 The locking pin 22 is arranged in a slot in the disc housing 14 and, in its initial position, engages in a locking pin receiving recess 74 formed on the inner wall of the cylinder housing 12. The locking pin 22 rests against the outside of the rear lifting disc 50, so that, unlike the core pin 46, the locking pin 22 does not fix the lifting disc 50 to the disc housing 14.

[0109] The Fig. 9 shows the same cross-sectional plane as the Fig. 6 , however, in the initial position with the key now inserted but not yet turned. As by comparing between Fig. 6 und Fig. 9 As can be seen, inserting the key does not cause any change in the cross-sectional plane shown.

[0110] The Fig. 10 shows the same cross-sectional plane as the Fig. 4 und 7 , while key 24 is turned into a so-called zero position, and the Fig. 13 shows the same cross-sectional plane again, while key 24 is turned into a so-called sorting end position. The corresponding diagram shows... Fig. 11 the same cross-sectional plane as the Fig. 5 und 8 in the zero position and the Fig. 14 shows once again the same cross-sectional plane as the Fig. 5, 8 and 11 in the sorting position. Fig. 12 shows the same cross-sectional plane as the Fig. 6 und 9 in the zero position and Fig. 15 shows once again the same cross-sectional plane as the Fig. 6, 9 and 12 in the sorting position.

[0111] In the zero position, the key 24 is rotated relative to the initial position along an unlocking direction D to such an extent that the disc housing 14 is temporarily locked against further rotation, while the adjusting discs 16 are now released for rotation relative to the disc housing 14 (so-called sorting). In the sorting final position, the sorting process of the adjusting discs 16 is complete, so that the locking recesses 20 of all adjusting discs 16 are aligned with each other. Furthermore, in the sorting final position, the fixing recesses 44 of all adjusting discs 16 are aligned with each other in the direction of the cylinder axis.

[0112] As the Fig. 10 und 13 Furthermore, as shown, the locking element formed by the rotary slide lock 58 initially locks the disc housing 14 in the zero position in order to fix the disc housing 14 relative to the cylinder housing 12 during the sorting of the adjusting discs 16. The rotary slide lock 58 is only moved from the locked position to the release position when the sorting end position is reached, whereby the rotary slide lock 58 is translationally displaced radially inwards. In the sorting end position according to Fig. 13 The rotary slide lock 58 is thus disengaged from the rotary slide lock receptacle 66 of the cylinder housing 12. This delayed movement of the rotary slide lock 58 into the release position, compared to the movement of the sliding lock 56, is effected by a rotational movement of the key 24.

[0113] The rotary slide lock 58 has an output flank 78 which, when the key 24 is inserted (i.e., in the initial position), does not yet come into contact with the tip 60 of the key 24. A drive flank 80 is located at the key tip 60 (see figure). Fig. 2a and 2b ) formed. The output flank 78 of the rotary slide lock 58 and the drive flank 80 at the tip 60 of the key 24 are adapted for this purpose and interact in such a way that the two flanks 78, 80 only come into contact with each other when the key 24 is moved in the unlocking direction D from the initial position (cf. Fig. 7 ) first into the zero position (cf. Fig. 10 ) and then rotated until just before the sorting end position. As soon as the two flanks 78, 80 have come into contact with each other, a slight further rotational movement of the key 24 is sufficient, which is transmitted via the drive flank 80 to the output flank 78 and thus to the rotary slide lock 58, so that the rotary slide lock 58, guided in the attachment 62, is moved translationally radially inwards out of the rotary slide lock receiving recess 66 into the release position. The locking cylinder 100 is now in the sorting end position (cf. Fig. 13 ).

[0114] The rotary slide lock receptacle 66 on the inner wall of the cylinder housing 12 is larger in the circumferential direction or in the direction of rotation D than the circumferential extent of the end of the rotary slide lock 58 projecting into the rotary slide lock receptacle 66. The rotary slide lock 58 thus has a rotational clearance relative to the cylinder housing 12 in its locked position. This rotational clearance, starting from the initial position, is as follows: Fig. 4 or Fig. 7 in unlocking direction D. After inserting the key 24, the rotational play must first be overcome by turning the key 24 and thus the disc housing 14 together with the rotary slide lock 58 into the zero position according to Fig. 10 can be rotated. Only then does a further rotation of the key 24 from the neutral position to the sorting position cause the rotary slide lock 58 to move from the locked position to the released position. The rotary slide lock 58 can therefore be moved from the initial position, which the key 24 is in after being inserted into the lock cylinder 100 (see Figure 1), when the key is turned in the unlocking direction D. Fig. 1 ) is rotated into the zero position in such a way that the rotary slide lock 58 initially remains in the radially outer locking position.

[0115] The rotary slide lock receptacle 66, which is formed on the inner wall of the cylinder housing 12, has a first stop surface 86 for the end of the rotary slide lock 58 projecting into the rotary slide lock receptacle 66. The end of the rotary slide lock 58 comes to rest against the first stop surface 86 when the key 24 is moved in the unlocking direction D from the initial position according to Fig. 7 is rotated into the zero position, as Fig. 10 The first stop surface 86 can block further rotation of the disc housing 14 in the unlocking direction D, especially if an attempt is made to operate the locking cylinder 100 with an incorrect, "wrong" key, over whose key tip the rotary slide lock 58 cannot be actuated from the zero position to the sorting end position during the turning of the key and thereby disengaged from the rotary slide lock receiving recess 66.

[0116] The rotary slide lock receptacle 66 of the cylinder housing 12 also has a second stop surface 88 opposite the first stop surface 86, against which the end of the rotary slide lock 58 projecting into the rotary slide lock receptacle 66 when the key is removed (cf. the Fig. 4 und 7 ) is located. The second stop surface 88 prevents the rotary slide lock 58, and thus the disc housing 14, from rotating beyond the initial position in the opposite direction of unlocking D. The initial position is therefore defined, in particular, by the stop of the rotary slide lock 58 against the second stop surface 88 of the cylinder housing 12 in the opposite direction of unlocking D, and in the opposite direction of unlocking D by the stop of the slide lock 56 against a third stop surface 90 of the cylinder housing 12, which limits the slide lock receiving recess 68 in the opposite direction of unlocking D.

[0117] In connection with the actuation of the rotary sliding lock 58, the special design of the key tip 60 will be explained in more detail below.

[0118] As mentioned, the key 24 for actuating the rotary slide lock 58 has a tip 60 on its shaft 81, which interacts with the rotary slide lock 58 when the key 24 is turned. As the Fig. 2a As shown, the shaft 81 has two broad sides 84 and two narrow sides 82, and the key point or shaft tip 60 accordingly has two broad sides 84a, two narrow sides 82a and one end face 85.

[0119] Each broad side 84 of the shank 81 has a plane 92 in which the outer surface of the respective broad side 84 lies. The plane 92 thus covers the outer elements or surfaces of the broad side 84 of the shank 81. Recesses, such as one or more longitudinal grooves in the broad side 84, are therefore set back from the plane 92 towards the key axis. Fig. 2a Only level 92 of the upper broadside 84 is shown.

[0120] On each broad side 84a of the shaft tip 60, a flattened area 94 is provided relative to the respective plane 92 of the corresponding broad side 84 of the shaft. The flattened area 94 of the upper broad side 84a is rotationally symmetrical by 180° about the longitudinal axis of the key to the corresponding flattened area on the lower broad side 84a of the key. Fig. 2a The key 24 is designed so that it can be used as a reversible key. The respective flattened section 94 extends transversely, i.e., perpendicular to the key axis, only over a portion of the corresponding broad side 84a of the shaft tip 60, while another portion of the corresponding broad side 84a of the shaft tip 60 forms the aforementioned drive flank 80 for actuating the rotary slide lock 58 and preferably lies in the plane 92 of the corresponding broad side 84 of the shaft. As explained above, when the key 24 is turned from the neutral position to the sorting position, the drive flank 80 comes into contact with the output flank 78 of the rotary slide lock 58 in order to move the rotary slide lock 58 into the release position (see Figure 1). Fig. 13 This, however, requires that the output flank 78 of the rotary slide lock 58 (in its locked position) comes close enough to the axis of rotation of the inserted key 24 (which corresponds to the cylinder axis and the longitudinal axis of the key). The respective flattening 94 at the shaft tip 60 allows the key 24 to remain in the starting position of the locking cylinder 100 ( Fig. 1 ) nevertheless, it can be inserted into the keyway 28 without the shaft tip 60 colliding with the rotary slide lock 58, which extends relatively close to the cylinder axis, and in particular with its output flank 78. This is shown in the Fig. 7 and 10As can be seen, the flattened section 94 of the shaft tip 60 is arranged directly adjacent to and parallel with the section of the rotary slide lock 58 that has the output flank 78. Within the limits defined by the keyway 28 (maximum cross-sectional extent of the shaft tip 60, i.e., maximum extension of the narrow sides 82a and the broad sides 84a), the rotary actuation of the rotary slide lock 58, delayed relative to the actuation of the slide lock 56, is thus enabled, provided the shaft tip 60 is sufficiently stable. This rotary actuation is achieved by the drive flank 80 of the shaft tip 60, which is arranged eccentrically with respect to the cylinder axis, performing a tangential movement (i.e., pivoting at a distance about the cylinder axis).

[0121] In the area of ​​the respective flattening 94, the broad side 84a of the shaft tip 60 is set back relative to the plane 92 of the broad side 84 of the shaft 81. In the Fig. 2a and 2b In the exemplary key 24 shown, the flattened section 94 extends longitudinally, i.e., viewed along the key axis, over the entire broad side 84a of the shank tip 60. In the transverse direction, however, the flattened section 94 extends over a portion of the broad side 84a, occupying approximately 70% of the width of the broad side 84a of the shank tip 60, while the drive flank 80 extends transversely over only approximately 30% of the width of the broad side 84a. The respective flattened section 94 is—as shown in Fig. 2a and 2bAs shown, the respective flattened surface 94 is inclined section by section with respect to the plane 92 of the corresponding broad side 84 of the shank, the angle of inclination between the respective flattened surface 94 and the plane 92 being open in a direction transverse to the longitudinal axis of the key (and not along the longitudinal axis of the key). In other words, the respective flattened surface 94 is inclined relative to the corresponding broad side 84 of the shank with respect to an axis that runs along or parallel to the longitudinal axis of the key.

[0122] The flattened surface 94 can have a smooth surface, so that no depressions (such as a bore) and / or protrusions are formed on it. Alternatively, at least one bore and / or at least one protrusion can be provided on the flattened surface 94 (not shown). The flattened surface 94 can, in particular, run parallel, or obliquely, or partially parallel and partially obliquely to the plane 92 of the corresponding shank side 84. The flattened surface 94 can, for example, be inclined relative to the plane 92 of the shank side 84 at an angle that can be in the range between 2 and 25 degrees. In particular, the flattened surface 94 can also have at least a slightly curved contour when viewed transversely to the key axis. In the embodiment according to Fig. 2b The respective flattening 94 is concavely curved in one direction perpendicular to the key axis.

[0123] As in the Fig. 2a Furthermore, as can be seen, the narrow sides 82a of the shaft tip 60 converge towards the front face 85 in a roof-like manner. The narrow sides 82a thus taper obliquely towards the front face 85.

[0124] Furthermore, the narrow sides 82a of the shaft tip 60 taper at the end of the shaft tip 60 facing away from the front face 85, so that the tip 60 is set off from the rest of the shaft 81 by a circumferential notch 96 on the narrow sides 82a. This notch 96 can be inserted into during the transition from the initial position ( Fig. 4 ) to the starting position ( Fig. 7 ) the sliding lock 56 engages. Viewed from the key tip 60, a further, second circumferential notch 98 may be formed behind the notch 96 on the narrow sides 92 of the shaft 81, into which a locking disc 102 associated with the second notch 98 engages when the key 24 is turned (cf. Fig. 1 If an incorrect key without a corresponding second notch 98 is used, the locking disc 102 can block the key from turning in the lock cylinder 100. This increases the resistance to manipulation.

[0125] The following section will explain the further operation of the locking cylinder 100 starting from the zero position.

[0126] How Figur 11 As shown, in the zero position, the control element 54 disengages from the control recess 70 of the front lifting disc 48 by moving radially outwards into engagement with a control element receiving recess 104 formed on the inside of the cylinder housing 12. This secures the disc housing 14 against rotation on the cylinder housing 12, while releasing the fixation of the front lifting disc 48 to the disc housing 14 effected by the control element 54.

[0127] As the Figur 11 Furthermore, as shown, the core pin 46 is also forced radially outwards from the fixing recess 72 of the front lifting disc 48 in the zero position, so that the core pin 46 engages with a core pin receiving recess 106 provided on the inner wall of the cylinder housing 12. Any blockage of the rotation of the front lifting disc 48 relative to the disc housing 14 caused by the core pin 46 is thus eliminated. Conversely, the core pin 46 secures the disc housing 14 against rotation on the cylinder housing 12 due to the engagement of the core pin 46 in the core pin receiving recess 106.

[0128] How Figur 12 As shown, the core pin 46 also disengages from the corresponding fixing recess 72 with respect to the rear lifting disc 50 and engages with the core pin receiving recess 106, which can extend, for example, in the form of an elongated groove over essentially the entire length of the inner wall of the cylinder housing 12. The fixing of the rear lifting disc 50 relative to the disc housing 14, effected by the core pin 46, is thus released.

[0129] In a corresponding manner, the core pin 46 also disengages from the fixing recesses 44 of the adjusting discs 16, so that in the zero position the blockage of the adjusting discs 16 relative to the disc housing 14 is released and the adjusting discs 16 are now available for sorting. This sorting now takes place, as explained, by the interaction of the notches 26 of the key 24 with the inner walls or limits of the receiving openings 18 of the adjusting discs 16.

[0130] Fig. 13 shows the sorting position after the rotary slide lock 58 has been moved into the release position by a rotary movement of the key tip 60 as explained.

[0131] As the Figur 14 As shown, the front lifting disc 48 is rotated in the sorting position such that the circumferential recess 108 provided on the outer circumference of the front lifting disc 48 is radially aligned with the control element 54. Furthermore, the fixing recess 72 is radially aligned with the core pin 46.

[0132] In the sorting position, the adjusting discs 16 are sorted. In particular, the locking recesses 20 of the adjusting discs 16 are (see Fig. 1 ) and accordingly, the locking recess 20 of the rear lifting disc 50 is aligned with each other in the direction of the cylinder axis and arranged radially inwards with respect to the locking pin 22. In addition, in the sorting position, the fixing recesses 44 of the adjusting discs 16 are aligned in the same manner as the fixing recess 72 of the rear lifting disc 50 according to Figur 15 , arranged radially inside with respect to the core pin 46 and aligned with each other in the direction of the cylinder axis.

[0133] The Figuren 16, 19 und 22 show the same cross-sectional plane as the Fig. 4, 7 , 10 und 13 However, the Fig. 16 the key 24 in a position opposite the sorting end position of the Fig. 13 further rotated in the unlocking direction D, the so-called unlocked position. Fig. 19 Key 24 is in a so-called unlocked position, and during the Fig. 22 Key 24 is in the unlock position.

[0134] The Fig. 17, 20 und 23 show the same cross-sectional plane as the Fig. 5, 8 , 11 und 14 This refers to Fig. 17 to the unlock position, whereas the Fig. 20 the unlocked position and the Fig. 23 The unlocked position is shown. Accordingly, the Fig. 18, 21 und 24 the same cross-sectional plane as the Fig. 6, 9 , 12 und 15 . The Fig. 18 This shows the situation in the unlocked position, whereas the Fig. 21 The unlocked position is shown. Fig. 24 It also shows the situation in the unlocked position.

[0135] As by comparing the Fig. 14 and 17As can be seen, when the key 24 is turned further in the unlocking direction D from the sorting end position, both the control element 54 and the core pin 46 are initially forced radially inwards. In doing so, the core pin 46 engages with the fixing recess 72 of the front lifting disc 48 or the rear lifting disc 50, which is located radially inside the core pin 46. Furthermore, the control element 54 engages with the circumferential recess 108 of the front lifting disc 48 and disengages from the control element receiving recess 104 formed in the cylinder housing 12. The inward movement of the core pin 46 and the control element 54 fixes the front lifting disc 48 to the disc housing 14.

[0136] As particularly in the Figuren 11, 14 and 17 As can be seen, the front lifting disc 48 has a stop 110 on its outer circumference, which, when the sorting end position is reached, according to the Figur 14 comes into contact with a counter-stop 112 provided on the disc housing 14 (a corresponding stop is also provided on the rear lifting disc 50). By further rotating the front lifting disc 48 and rear lifting disc 50, coupled to the key 24, in the unlocking direction D from the sorting end position according to Fig. 14 The disc housing 14 is thus moved along with the disc due to the interaction between the stop 110 and the counter-stop 112. In doing so, the disc housing 14 presses the core pin 46 against a core pin guide chamfer 114, which limits the core pin receiving recess 106 in the unlocking direction D and through which the core pin 46 is forced into the fixing recesses 72 of the lifting discs 48, 50 and into the fixing recesses 44 of the adjusting discs 16 at a precisely defined angular position (see figure). Fig. 17 und 18 ).

[0137] In the corresponding manner, when the disc housing 14 is rotated out of the sorting position, the disc housing 14 forces the control element 54 against a control element guide ramp 116 which limits the control element receiving recess 104 in the unlocking direction D, by which the control element 54 is forced radially inwards into the circumferential recess 108 of the front lifting disc 48 at a defined angular position (cf. Fig. 17 ). This allows the angular position of the disc housing 14 to be defined with particularly high accuracy, in which (for the subsequent unlocking) the disc housing 14 is decoupled from the cylinder housing 12 and coupled with the front lifting disc 48 (and thus with the key 24).

[0138] As with regard to the Figur 15 As shown, the locking pin receptacle 74 of the cylinder housing 12 in the sorting end position offers a greater rotational clearance compared to the core pin receptacle 106 and the control element receptacle 104 (especially in the unlocking direction D), so that when the disc housing 14 is rotated further in the unlocking direction D from the sorting end position, the locking pin 22 is not initially forced radially inwards into the locking recess 20 of the rear lifting disc 50 and correspondingly into the locking recesses 20 of the adjusting discs 16 (cf. Fig. 18 ).

[0139] As the Fig. 18 und 21 As shown, the locking pin 22 only comes into contact with a locking pin guide chamfer 118, which limits the locking pin receiving recess 74 in the unlocking direction D, when the unlocked position is reached. As the disc housing 14 continues to rotate, the locking pin guide chamfer 118 pushes from the unlocked position to the unlocked position according to Fig. 21the locking pin 22 radially inwards, so that the locking pin 22 engages with the locking recesses 20 of the rear lifting disc 50 and the adjusting discs 16. The key 24, together with the disc housing 14 and the discs 16, 48, 50, can then be moved into the unlocked position according to the Figs. 22, 23 and 24 It will be turned further in order to operate a locking mechanism using attachment 62, as explained.

[0140] In the case of the locking cylinder 100, it can thus be easily achieved, according to the above explanations, that when the disc housing 14 is turned by means of the key 24 from the sorting position and in the unlocking direction D, the core pin 46 first engages in the fixing recesses 72 of the lifting discs 48, 50 and in the fixing recesses 44 of the adjusting discs 16 (cf. Fig. 1) and thereby fixes the adjusting discs 16 relative to each other and to the disc housing 14, and only then (due to a further rotation of the disc housing 14) does the locking pin 22 penetrate the locking recesses 20 to release the disc housing 14 for further rotation into the unlocked position. Due to the explained different rotational clearance and the explained defined temporal sequence, the locking pin 22 cannot be forced radially inwards with the aid of the locking pin guide chamfer 118 at a point in time when the adjusting discs 16 can still be rotated separately (e.g., using a picking tool). This prevents scanning the respective coding of the individual adjusting discs 16.

[0141] To lock, the key 24 is turned from the unlocked position according to the Figs. 22, 23 and 24opposite the direction of rotation D to the starting position. The sequence and interaction of the individual elements of the locking cylinder 100 are evident from the preceding description.

[0142] The front lifting disc 48 has a second stop 120 on its outer circumference, which engages when the front lifting disc 48 is turned back from the sorting end position (see Fig. 14 ) opposite to the unlocking direction D, i.e. in the locking direction, upon reaching the zero position comes into contact with a second counter-stop 122 provided on the disc housing 14 (cf. Fig. 11A corresponding stop is also provided on the rear lifting disc 50. By turning the lifting discs 48, 50 back from the zero position in the locking direction, the disc housing 14 can be rotated due to the interaction between the second stop 120 and the second counter-stop 122 in order to force the control element 54 and the core pin 46 radially inwards (see in particular the Fig. 8 and 11 ). Reference symbol list

[0143] 10, 100 Lock cylinder 12 Cylinder housing 14 Disc housing 16 Adjusting disc 18 Receptacle 20 Locking recess 22 Locking pin 24 Key 26 Cut 32 Slot 34 Locking pin receptacle 36 Intermediate disc 38, 38a Circumferential recess 40 Stop section 42 Projection 44 Fixing recess 46 Core pin 48 Front lifting disc 50 Rear lifting disc 52 Cover 54 Control element 56 Sliding lock 58 Rotary sliding lock 60 Key tip 62 Attachment 64 Clip 66 Rotary sliding lock receptacle 68 Sliding lock receptacle 70 Control recess 72 Fixing recess 74 Locking pin receptacle 78 Output flank 80 Input flank 81 Shaft 82, 82a Narrow side 84,84a Broadside 85 Endside 86 First stop surface 88 Second stop surface 90 Third stop surface 92 Plane 94 Flattening 96 Notch 98 Second notch 102 Locking washer 104 Control element receptacle 106 Core pin receptacle 108 Circumferential recess 110 Stop 112 Counter stop 114 Core pin guide chamfer 116 Control element guide chamfer 118 Locking pin guide chamfer 120 Second stop 122 Second counter stop AInput direction DUnlocking direction

Claims

1. A lock cylinder comprising a cylinder housing (12); a disk housing (14) rotatably supported about a cylinder axis in the cylinder housing (12); a plurality of rotatably supported disk tumblers (16) arranged along the cylinder axis in the disk housing (14), wherein each disk tumbler (16) has a reception opening (18) for a key (24); and a blocking element (58) which is arranged in front of the disk tumblers (16), viewed in a key introduction direction (A), and which is rotationally fixedly coupled to the disk housing (14), wherein the blocking element (58) is configured to adopt a blocking position in which the blocking element (58) blocks the disk housing (14) against a rotation relative to the cylinder housing (12) by the blocking element (58) engaging into a reception recess (66) of the cylinder housing (12), characterized in that the blocking element (58) has a rotational clearance relative to the cylinder housing (12) in the blocking position, with the blocking element (58) further being configured, after introduction of the key (24) into the lock cylinder, to be moved by a rotation of the introduced key (24) in an unlatching direction (D), only after overcoming the rotational clearance, out of the blocking position into a release position in which the blocking element (58) is out of engagement with the reception recess (66).

2. A lock cylinder according to claim 1, characterized in that the blocking element (58) has a driven flank (78) which cooperates with a drive flank (80) formed at the tip (60) of the key (24) such that the blocking element (58) is moved out of the blocking position into the release position by a rotation of the key (24) in the unlatching direction (D).

3. A lock cylinder according to claim 2, characterized in that the driven flank (78) of the blocking element (58) and the drive flank (80) at the tip (60) of the key (24) are adapted such that the two flanks (78, 80) only contact one another when the key (24) is rotated into at least one first rotational position from an initial position which the key (24) adopts after an introduction into the lock cylinder (100).

4. A lock cylinder according to claim 3, characterized in that the driven flank (78) of the blocking element (58) and the drive flank (80) at the tip (60) of the key (24) are adapted such that the blocking element (58) moves out of the blocking position into the release position, while the key (24) is rotated from the first rotational position in the unlatching direction (D) into a second rotary position.

5. A lock cylinder according to any one of the claims 2 to 4, characterized in that the reception openings (18) of the disk tumblers (16) form a keyway (28) in a starting position of the lock cylinder (100), with the driven flank (78) of the blocking element (58) being arranged outside the keyway (28).

6. A lock cylinder according to any one of the preceding claims, characterized in that the tip (60) of the key (24) has a cross-sectional shape having two narrow sides (82a) and two broad sides (84a) which are longer than the narrow sides, with the blocking element (58) being drivable by means of one of the broad sides (82a) of the key tip (60) to move out of the blocking position into the release position.

7. A lock cylinder according to claim 1, characterized in that the blocking element (58) can be co-rotated on a rotation of the key (24) in the unlatching direction (D) from an initial position which the key adopts after the introduction into the lock cylinder (100) into a first rotational position such that the blocking element (58) first remains in the blocking position; or in that the reception recess (66) of the cylinder housing (12) has a first abutment surface (86) for an end of the blocking element (58) projecting into the reception recess (66), which first abutment surface (86) the end of the blocking element (58) comes into contact with when the key (24) is rotated in the unlatching direction (D) from an initial position which the key (24) adopts after the introduction into the lock cylinder (100) into a first rotational position, with the first abutment surface (86) blocking a further rotation of the blocking element (58) in the unlatching direction (D).

8. A lock cylinder according to claim 7, characterized in that the reception recess (66) has a second abutment surface (88) for the end of the blocking element (58) projecting into the reception recess, with the end of the blocking element (58) contacting the second abutment surface (88) and the second abutment surface (88) blocking a rotation of the blocking element (58) against the unlatching direction (D) when the key (24) is removed from the lock cylinder (100).

9. A lock cylinder according to any one of the preceding claims, characterized in that the blocking element (58) is displaceably supported in a straight line in a normal plane to the cylinder axis; and / or in that the blocking element (58) is preloaded in the direction of the blocking position; and / or in that a further blocking element (56) is arranged in front of the disk tumblers (16), viewed in the key introduction direction (A), and is rotationally fixedly coupled to the disk housing (14), with the further blocking element (56) adopting, when the key (24) is removed from the lock cylinder (110), a blocking position in which the further blocking element (56) engages into a further reception recess (68) of the cylinder housing (12), and with the further blocking element (56) being movable out of engagement with the further reception recess (68) and thus into a release position by introducing the key (24) into the lock cylinder (100).

10. A key or key blank for a lock cylinder (100) according to any one of the preceding claims, comprising a shaft (81) whose tip (60) is adapted for cooperation with a blocking element (58) provided in the lock cylinder (100), wherein the shaft (81) has two broad sides (84) and two narrow sides (82), and wherein the shaft tip (60) has two broad sides (84a), two narrow sides (82a) and one end face (85), characterized in that a flattened portion (94) is provided set back relative to a plane (92) of the broad side (84) of the shaft (60) at at least one broad side (84a) of the shaft tip (60).

11. A key or a key blank according to claim 10, characterized in that the flattened portion (94) is formed along the key axis over the total broad side (84a) of the shaft tip (60); and / or in that the flattened portion (94) only extends over a part of the broad side (84a) of the shaft tip (60) in a direction transverse to the key axis, while another part of the broad side (84a) of the shaft tip (60) lies in the plane (92) of the broad side (84) of the shaft (60).

12. A key or a key blank according to claim 10 or 11, characterized in that the flattened portion (94) extends in parallel with the plane (92) of the broad side (84) of the shaft (81); or the flattened portion (94) extends obliquely to the plane (92) of the broad side (84) of the shaft (81); or the flattened portion (94) extends sectionally in parallel with and sectionally obliquely to the plane (92) of the broad side (84) of the shaft (81).

13. A key or a key blank according to any one of the claims 10 to 12, characterized in that the flattened portion (94) is inclined by a predefined angle relative to the plane (92) of the broad side (84) of the shaft (81), wherein the angle is preferably in a range from 2 to 25 degrees, further preferably in a range from 5 and 20 degrees, and even further preferably in a range from 10 to 15 degrees; and / or in that a respective flattened portion (94) is provided at each of the two broad sides (84a) of the shaft tip (60), with the two flattened portions (94) being formed rotationally symmetrical to one another; and / or in that the two narrow sides (82a) of the shaft tip (60) extend in a tapering and oblique manner in the direction of the end face (85).

14. A key or a key blank according to any one of the claims 10 to 13, characterized in that the shaft tip (60) is set off from the remaining part of the shaft (81) by a peripheral notch (96) at the narrow sides (82) of the shaft (81), with the notch (96) preferably having a spacing from the front end of the shaft tip (60) which amounts to between 1 mm and 3 mm.

15. A key or a key blank according to claim 14, characterized in that a further peripheral notch (98) is formed at the narrow sides (82) of the shaft (81) in a front part of the shaft (81) disposed in the vicinity of the shaft tip (60), with the further notch (98) preferably having a spacing from the front end of the shaft tip (60) which amounts to between 3 mm and 5 mm.