Key with a spring loaded coding element, lock cylinder with drill protection and closing device comprising a key and a lock cylinder

Abstract

The invention relates to a locking device with a locking cylinder (1) and a key (30), wherein the key shaft (31) has a coding element (35) which has a head (36) which can spring from an operating position into a passing position into a cavity (39) in order to pass an obstacle (11) arranged in the key channel (10) or, in a fully inserted position, to move a locking element into a release position.

Description

field of technology

[0001] The invention relates to a locking device with a locking cylinder and a key, wherein the locking cylinder has a cylinder core mounted in a housing cavity, which is locked against movement by a locking element in a locking position and has a key channel for inserting a flat key shaft of the key, with a head of a coding element projecting from a broad side of the key shaft, which in an active position when the key shaft is fully inserted into the key channel moves a key element to move the locking element into a release position in which the cylinder core is movable.

[0002] The invention further relates to a locking cylinder for such a locking device and a matching key. State of the art

[0003] DE 10 2004 021 580 B3 describes a locking device with a cylinder lock into whose keyway a flat key can be inserted, the flat key having a coding element head projecting from one broad side of the key shaft. The head interacts with a push-button element that can move a locking element from a locked position to a released position.

[0004] DE 197 29 234 A1 and US 5,682,799 A describe a locking device with a locking cylinder in whose shaft a movable coding element is arranged. The coding element interacts with a locking element.

[0005] Furthermore, methods are known in the prior art for preventing the drilling of a cylinder core of a lock cylinder. Such a cylinder core has bores extending parallel to the keyway, each containing a drill protection element made of a hard material. The distance between the two drill protection elements is slightly greater than the distance between two boundary planes between which the two broad sides of the flat key extend. Summary of the invention

[0006] The invention is based on the objective of improving a locking cylinder in terms of locking technology and / or security technology.

[0007] The problem is solved by the invention specified in the claims, wherein the dependent claims relate not only to advantageous further developments of the invention specified in the dependent claims, but also to independent solutions to the problem.

[0008] First and foremost, it is proposed that the head of the coding element can be moved from an active position to a passing position. In the active position, the head of the coding element projects beyond a boundary plane in such a way that it interacts with a locking element as described above, moving it from a locked position (preventing rotation of the cylinder core) to a released position. The locking cylinder also features an obstacle. This obstacle can be formed by a drill protection element, in particular a pair of drill protection elements, the drill protection elements being spaced a minimum distance apart. This distance is dimensioned such that the coding element cannot pass the drill protection elements in the active position. For this to occur, the head must be moved into the passing position. In the passing position, one apex of the head has a reduced distance from the broad side of the key shaft.For this purpose, the head is actuated by a spring element. The spring element is tensioned when the coding element passes the drill protection elements. A portion of the head then contacts a section of the keyway, in particular a section of the drill protection element that crosses a groove of the keyway. This causes the head to be displaced into a cavity of the coding element. The drill protection element acts as an obstacle. After passing the obstacle or drill protection element, the head can spring back out of the cavity into its operating position. In the fully inserted position of the key shaft, the head of the coding element displaces the locking element. This is preferably achieved by means of a stylus formed by the key element. The key element can be displaceable within a cavity of the cylinder core. The cavity extends between the keyway and the cylinder wall of the cylinder core.The locking element can be arranged in a bore in the wall of the cavity in which the cylinder core is mounted. The locking element can be a locking pin which, in its locked position, engages in a locking recess in the cylinder core to prevent the cylinder core from rotating. Additional locking devices, in particular pin tumblers, can be provided to prevent the cylinder core from rotating. The pin tumblers preferably consist of a core pin mounted in the cylinder core and a housing pin mounted in a flange area of ​​the cylinder housing. The pin tumblers are actuated by locking springs. The flat key can have notches or bores for engaging the pin tumblers.

[0009] The invention further relates to a locking cylinder for such a locking device, comprising a cylinder core mounted in a housing cavity. The cylinder core has a keyway with two spaced-apart walls. Drill protection elements made of a hard material can run parallel to the walls. These drill protection elements are spaced apart. The keyway also has at least one cavity formed by a groove that begins at the insertion opening of the keyway and extends to a bore in which a key element is arranged. The head of a coding element of a key shaft can move within this groove when the key shaft is inserted into the keyway.According to the invention, at least one of the drill protection elements intersects this groove, so that the cavity into which a sensing section of the sensing element engages when the key is not inserted is covered or shaded by the drill protection element. This drill protection element forms an obstacle against which the head of the coding element abuts when the key is inserted. As a result, the key inserted into the keyway experiences mechanical resistance when the head, protruding from a broad side, strikes the drill protection element. Increased thrust must be exerted on the key so that the head of the coding element can penetrate a cavity in the shaft. For this purpose, the head can have a slanted flank and / or the drill protection element can have a slanted flank. The head can be dome-shaped for this purpose. The drill protection element can have a circular cylindrical cross-section for this purpose.After passing the drill protection element, the head springs out of the recess to enter the groove or the concealed cavity. Upon reaching the sensing section of the sensing element, the sensing element is actuated in a direction away from the keyway. One head of the sensing element can interact with the locking element to displace it from the locking recess of the cylinder core.

[0010] When the key is withdrawn from the keyway, the head of the coding element initially moves out of the area of ​​effect of the keying section. A spring acting on the keying element, which may be a spring acting on the locking element, then moves the keying section back into the recess. As the key is further withdrawn from the keyway, the head travels through the groove forming the recess until it reaches the anti-drilling element or the obstacle intersecting the groove. The head then engages the anti-drilling element, forcing it against the restoring force of the spring acting on the head to enter the recess of the key shaft and pass through it. The user will again feel mechanical resistance when withdrawing the key.The obstacle thus creates a mechanical element that the user must noticeably overcome when inserting or removing the key.

[0011] Preferably, two drill protection elements are provided, which may be made of hard metal. The two drill protection elements can be formed by circular cylindrical bodies that are inserted into bores in the cylindrical core. The two drill protection elements extend parallel to each other and are spaced apart. This clear distance is dimensioned such that it is only slightly larger than the distance between the boundary planes between which the two broad sides of the key shaft extend. The two broad sides of the key shaft can be profiled by grooves and ribs extending in the direction of the key shaft's extension. The two boundary planes can be tangent to the highest ribs of each broad side, so that the boundary planes represent surfaces of a cladding body that encloses the key shaft. However, the boundary plane can also be spaced slightly away from the body of the key shaft.In its operating position, the head of the coding element projects beyond one of these limiting planes, so that when the key shaft is inserted into the keyway, it must engage one of the locking elements. Alternatively, the head may be designed to engage a projection or step extending into the keyway. It may also be designed so that the head can be displaced against the restoring force of a spring element until it is below the limiting plane, so that in the passing position the head lies within the housing.

[0012] It can further be provided that the locking element is formed by a locking pin which is acted upon by a locking pin in the direction of the axis of rotation of the cylinder core. The locking pin can be formed by a cap having a cavity in which the locking pin spring, formed by a helical compression spring, is located. The locking pin spring can be supported against the bottom of a locking pin housing inserted in a bore. The cap can have a rim that engages against a projection of an edge of the locking pin housing in order to remain fixed to the locking pin housing in the locked position. The spring acting on the head of the coding element, in particular a compression spring, has a greater spring force than the spring acting on the locking pin, in particular a compression spring, so that the head does not move when the locking pin is moved into its release position.

[0013] The coding element can be multi-part and inserted into a bore, particularly a blind bore, in the key shaft. The bore can have an axis perpendicular to the boundary plane. The coding element can form a base part shaped like a pot or a basin, the base of which can rest on the bottom of the bore. One end of a helical compression spring can rest against the inner wall of the base of the pot. The head of the coding element can be formed by a cap that creates a cavity. The other end of the helical compression spring can rest against the ceiling of this cavity. The head can have a rim. The rim can form a collar. The collar can be positioned below a retaining ring. The retaining ring prevents the head from protruding from the cavity of the base part. A fastening section of the retaining ring can abut a wall of the base part.It can be screwed to the wall. Alternatively, it can be clamped onto the wall. The retaining ring can be connected to the base part by friction or form-fitting means.

[0014] One embodiment of the invention provides that exactly one coding element with a spring-loaded head is located in one of the two broad sides of the key shaft. In another embodiment, each of the two broad sides may have a coding element with a spring-loaded head. It may be provided that each of the two coding elements interacts with an obstacle, in particular a drill protection element, as described above when the key shaft is inserted into the keyway. The two coding elements can be arranged such that they are equidistant from the key tip, so that they each simultaneously engage with an obstacle.

[0015] The key equipped according to the invention can also interact with a locking cylinder that forms a keyway without any obstruction to the coding element. In such a configuration, the spring-loaded head of the coding element has a tolerance-compensating effect. In the release position, the locking pin can assume a stop position against which it is acted upon by the force of the spring acting on the head. The key element can have a slight excess length, so that the head, in the operating position, can enter slightly into the corresponding recess of the key shaft. Brief description of the drawings

[0016] Exemplary embodiments of the invention are explained below with reference to the accompanying drawings. These show: Fig. 1 a longitudinal section through a lock cylinder 1 with the key 30 fully inserted along line II in Figure 2, Fig. 2 a cross-section through the locking cylinder 1 according to line II-II in Figure 1 , however, the key is not fully inserted into the keyway 10, Fig. 3 enlarges the view shown in the Figure 2 The cross-section shown, wherein the key is inserted into the keyway 10 to such an extent that the head 36 of a coding element 35 lies in front of a drill protection element 11, Fig. 4 a subsequent representation of the Figure 3 , when the key 30 has been inserted slightly further into the key channel 10 until the head 36 has been moved into a passing position towards the key shaft 31, Fig. 5 the section according to line VV in Figure 1 , with a stylus 13 lying in the section plane, whose stylus section 14 is acted upon by the head 36 of the coding element 35 which is in the operating position, and which has moved a locking pin 19 into a release position, Fig. 6 a representation according to Figure 5of a second embodiment, which has two coding elements 35, Fig. 7 a perspective view of the coding element 35, Fig. 8 a longitudinal section through the coding element 35, Fig. 9 a view according to Figure 8 with the head 36 of the coding element 35 fully compressed. Description of the embodiments

[0017] The locking cylinder 1 shown in the drawings can be a double locking cylinder or a single locking cylinder. Figure 1 Figure 1 shows only the right half of a lock cylinder 1, which has a housing containing a housing cavity 2. The housing cavity 2 has an inner wall that runs along a cylinder surface. A cylinder core 3, which can rotate about an axis, is inserted into the housing cavity 2. The axis runs in an insertion direction in which the shaft 31 of a key 30 can be inserted into the keyway 10.

[0018] The housing of the lock cylinder 1 has a flange section 4 in which housing bores 5 extending radially in the direction of rotation of the cylinder core 3 are located. A housing pin 7 is located in the housing bores 5, which is acted upon in the direction of rotation by a locking spring 6. Figure 1 Figure 5 shows a total of six such housing bores 5. The locking elements 7, 6 are shown only in one of these housing bores 5.

[0019] In a locked position of the cylinder core 3, the core bores 8 of the cylinder core 3 align with the housing bores 5. Core pins 9 of different lengths are inserted into the core bores 8. The key's locking mechanism is set by the lengths of the core pins 9. The ends facing the axis of rotation, which are formed by points, engage in notches 34 of a breast of the key shaft 31. If the notches 34 have the correct cutting depth, the core pins 9 are positioned such that their dividing surfaces with the corresponding housing pins 7 lie in the area of ​​the joint between core bore 8 and housing bore 5, so that these locking elements 7, 9 do not exert a locking effect on the cylinder core 3.

[0020] The Figures 5 and 6Figure 1 shows another locking element, namely a locking pin 19, which is arranged in the wall of the housing cavity 2. For this purpose, the wall has a bore 21 in which a locking pin housing 20 is inserted. The locking pin housing 20 is cup-shaped with a base against which a locking pin spring 22 can be supported. This pre-tensioned helical compression spring acts on a locking pin 19, which is also cup-shaped and inserted into the cavity of the locking pin housing 20. The other end of the locking pin spring 22 is supported against the base of the cavity of the locking pin 19. The locking pin 19 has a collar at its opening edge, which projects radially outwards and, when the locking pin 19 is fully extended, bears against a crimp on the edge of the cavity of the locking pin housing 20.

[0021] In the Figures 5 and 6The locking pin 19 is shown in its release position. In this release position, it is held by a head 19 of a sensing pin 13. The head 19 of the sensing pin 13 lies in a recess 23, which forms a locking recess for the entry of the locking pin 19 when the sensing pin 13 is not acting upon the locking pin 19.

[0022] The head 15 forms a head surface 16, which extends over the area of ​​a flat cone. A section of this head surface 16 runs approximately along the cylindrical surface of the cylindrical core 3, such that a vertex of this head surface 16 abuts a substantially flat end face of the locking pin 19. The axis of a stylus bore 17, in which a shaft section of the stylus 13 is slidably mounted, runs inclined to a radial line through the axis of rotation of the cylindrical core 3, the angle of inclination corresponding approximately to the cone opening angle of the flat cone that forms the head surface 16.

[0023] The key shaft 31 has two diverging broad sides 30', 30", each with grooves or ribs extending in one direction along the shaft 31. The keyway 10 has side walls from which corresponding ribs or grooves project, so that only a flat key with corresponding grooves can be inserted into the keyway 10.

[0024] A coding element 35 is embedded in a recess 46 in a broadside 30'. The coding element 35 has a head 36 that projects beyond a boundary plane 48 of the broadside 30'. Boundary plane 48 is defined here as the surface that runs parallel to another boundary plane 48 in which the vertex of the highest rib of the broadside 30' lies, or is slightly offset from a plane passing through this vertex. The position of the other boundary plane is also defined by the vertex of the highest rib projecting from the broadside 30', or may be slightly offset from a plane in which the vertex lies. The two boundary planes thus form parallel enclosing surfaces of an enclosing body.

[0025] The head 36 can deflect against the restoring force of a spring element 40. However, the force of the spring element 40 is greater than the force of the locking pin spring 22, so that the head 36 is able to hold the stylus 13, whose stylus section 14 is supported in the apex region of the head 36, in the Figures 5 and 6 to maintain the release position shown, in which the head 15 of the stylus 13 holds the locking pin 19 in its release position.

[0026] The Figure 5The figure shows the head 36 in a fully extended position. However, it is also possible that the head 36 is slightly compressed in its operating position shown there, for example, if the sensing pin 13 has an excessive length. The sensing pin 13 may also have a slight underlength, so that the locking pin 19 is not fully compressed in the operating position. To ensure that the locking pin 19 is fully compressed in the release position, the sensing pin can have the aforementioned excess length.

[0027] In an operating position of the lock (not shown), in which the shaft 31 of the key 30 is not inserted into the keyway 10, the tactile pin 13 is moved by the then relaxing locking pin spring 22 towards the keyway 10 until an edge projection of the head 15 rests against the bottom of the recess 23. The head 15 is thereby moved so deeply into the recess 23 that the locking pin 19 also engages in the recess 23 and thus blocks the rotation of the cylinder core 3.

[0028] The coding element 35 is inserted into a bore 46 in the broad side 30' of the shaft 31. The one in the Figure 6 The illustrated embodiment differs essentially from the one described in the Figure 5 The illustrated embodiment is represented by the number of coding elements 35. The one in the Figure 5 The illustrated embodiment has a coding element 35. The one shown in the Figure 6The illustrated embodiment has two coding elements 35 arranged on different broad sides 30', 30". In this embodiment, the coding elements 35 are equidistant from a key tip and a key bow 32, respectively.

[0029] The bore 46 is a blind bore with a bottom on which the underside of a base part 38 rests. The base part 38 is trough-shaped or pot-shaped and forms a cavity 39 and a bottom 38'. A wall adjoins the bottom 38', surrounding the cavity 39 and forming a fastening section 45.

[0030] The head 36 is formed by a cap 37 with a domed head surface. The cap 37 has a cavity 41 with a support surface 41'. A helical spring, which is a compression spring, is supported at one end on the base 38' and at the other end on the support surface 41'.

[0031] The opening edge of the cap 37 forms a radially outward-facing collar 42, which is covered by a retaining ring 43. The retaining ring is placed on the opening of the base part 43 and is connected to the base part 38. For this purpose, the retaining ring 43 can form a fastening section 44, which forms a positive-locking or frictional connection with the fastening section 45. The two fastening sections 44 and 45 can be connected to each other via a thread. Alternatively, they can be clamped together. A circumferential wall 47 can frictionally engage an inner wall of the recess 46. Here, too, a positive-locking connection between the inner wall of the recess 46 and the circumferential wall 47 can be provided.

[0032] The coding element 35 can also be crimped in the opening 46; for this purpose, the edges of the opening 46 are crimped inwards and can engage in the area of ​​the chamfer of the retaining ring 43.

[0033] The cylindrical core 3 has two parallel bores 12, which are located in the insertion direction of the key shaft 31 in front of the stylus 13 and the stylus bore 17, respectively. A circular cylindrical drill protection element 11, made of a hard material, is inserted into each of these bores 12. The drill protection elements 11 are spaced A apart, which is only slightly greater than the distance between the two boundary planes mentioned above.

[0034] The Figure 3This shows that a fully extended head 36 of the coding element 35 projects partially out of the space defined by the distance A. The keyway 10, or rather its walls 10', forms a cavity 18, which is formed by a groove extending in the direction of the rotation axis of the cylinder core 3. The groove runs from the insertion opening of the keyway 10 to at least the tactile pin bore 17. This groove, like the aforementioned grooves and ribs of the wall 10' of the keyway 10, can be produced by broaching. When the key is inserted, the extended head 36 of the coding element 35 enters this groove.

[0035] The Figures 3 and 4This shows that this groove 18 is at least partially crossed by the drill protection element 11. The rear part of the groove 18, i.e., the cavity into which the sensing section 14 of the sensing pin 13 enters when the locking pin 19 is in the locked position, is thus shadowed or covered by a section of the drill protection element 11.

[0036] The drill protection element 11 thus forms an obstacle for the head 36 of the coding element 35 when the shaft 31 of the key 30 is inserted into the key channel 10. The obstacle, or rather the drill protection element 11, lies in the path of movement of the head 36. In the exemplary embodiment, both the drill protection element 11 and the head 36 each form rounded surface sections which meet each other when the head 36 of the drill protection element 11 touches them, thereby forming an angled flank pairing. This allows the head 36 to plunge into the cavity 39 of the coding element 35 by applying an increased insertion force until the head 36 reaches the point where it is inserted. Figure 4The head 36 has reached the depicted passing position, in which it can, in a sense, pass under the drilling protection element 11. After passing the drilling protection element 11, the head 36 springs back into the cavity 18, in order to then interact with the rounded sensing section 14 in a similar manner, but without springing back, instead pushing the sensing pin 13 into the recess 18. Figure 5 to shift the position shown.

[0037] The Figure 6Figure 1 shows a second coding element 35, depicted below right, also with a head 36, but with a channel 26 that is somewhat shallower, so that the channel itself forms an obstacle against which the head 36 abuts when the key shaft 31 is inserted into the key channel 10. Here, too, the channel 26 can be designed to be deep enough to allow a spring-loaded head 36 to enter, so that this head 36 of the second coding element 35 must also assume a passing position when passing the associated drill protection element 11, in which the head 36 is displaced inwards towards the shaft 31.

[0038] Pulling the shaft 31 out of the keyway 10 also requires the head 36 of the coding element 35 to spring back when the head 36 passes the associated drill protection element 11.

[0039] The invention offers, among other things, the technical advantage that the coding elements 11 have a minimal distance between them, thus increasing the locking security of the cylinder. This makes the drilling method for forcibly opening the cylinder more difficult.

[0040] Furthermore, the compression spring 40 acting on the head 36 of the coding element 35 can act as a tolerance compensation element.

[0041] The invention also provides a further technical advantage in that inserting the key into the keyway is accompanied by a noticeable resistance. This resistance is added to the resistance already exerted on the key by the locking elements 7, 8 described above.

[0042] The foregoing statements serve to explain the inventions covered by the application as a whole, which each independently further develop the prior art at least through the following combinations of features, whereby two, several or all of these combinations of features may also be combined, namely:

[0043] A locking device characterized in that the head 36 is held in the operating position by a spring element 40, and an obstacle 11 arranged in the insertion direction in front of the key element 13 lies in the path of movement of the head 36, so that when passing the obstacle 11 the head 36 enters a cavity 39 in the key shaft 31.

[0044] A closing device characterized in that the obstacle 11 is formed by a drill protection element 11 covering a cavity 18, wherein in particular it is provided that two cylindrical drill protection elements 11 are arranged in bores 12 running parallel to each other.

[0045] A locking cylinder characterized in that the sensing section 14 is shaded by the drill protection element 11 in the direction of the axis of rotation.

[0046] A locking cylinder or a locking device characterized in that the cavity 18 for receiving the coding element 35 assuming its operative position is a section of a groove extending in the direction of the axis of rotation and open to the wall 10' of the keyway, which is crossed by the drill protection element 11.

[0047] A locking cylinder or a locking device characterized in that the locking element 19 is acted upon by a spring element 22 in the direction of the axis of rotation and is inserted in a bore 21 in the wall of the housing cavity 2.

[0048] A key characterized in that the head 36 can be displaced below the limiting plane 48 against the restoring force of a spring element 40.

[0049] A key or a locking device characterized in that the coding element 35 is arranged in a recess 46 of at least one of the broad sides 30', 30" and forms a cavity 39 into which the head 36 can immerse.

[0050] A key or a locking device characterized in that the coding element 35 has a trough-shaped base part 38 inserted in a recess 46 of the key broad side 30', with a bottom 38' on which a compression spring 40 is supported with a first end, and a cap 37 forming the head 36 with a support surface 41' on which a second end of the compression spring 40 arranged in a cavity 39, 41 is supported.

[0051] A key or a locking device characterized in that a radially outwardly projecting collar 42 of the cap 37 is covered by a retaining ring 43 which has a circumferential wall 47 with which the coding element 35 is secured in the recess 46.

[0052] All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of this application hereby incorporates in full the disclosure content of the associated / attached priority documents (copy of the earlier application), also for the purpose of including features of these documents in the claims of the present application. The dependent claims, even without the features of a referenced claim, characterize independent inventive developments of the prior art, in particular for the purpose of filing divisional applications based on these claims. The invention specified in each claim may additionally include one or more of the features described above, in particular those identified by reference numerals and / or listed in the reference numeral list.The invention also relates to design forms in which individual features mentioned in the preceding description are not realized, in particular insofar as they are recognizably unnecessary for the respective purpose or can be replaced by other technically equivalent means. List of reference symbols

[0053] 1 Lock cylinder / housing 26 channel 2 Case cavity 3 Cylinder core 30 Key 4 Flange section 30' broadside 5 Housing bore 30" broadside 6 Locking spring 31 shaft 7 Housing pin 32 Reide 8 Core drilling 33 Nut 9 core pen 34 score 10 Key channel 35 Coding element 10' Keyway wall 36 Head 11 Drill protection element / obst 37 cap 12 Drilling 38 Base part / tub 13 stylus 38' Floor 14 tactile section 39 cavity 15 Head 40 Spring element / compression spring 16 Head surface 41 cavity 17 stylus bore 41' Support surface 18 cavity / groove 42 collar 19 Locking pin 43 retaining ring 20 Locking pin housing 44 Fastening section 21 Drilling 45 Fastening section 22 Locking pin spring 46 in-depth 23 Exclusion 47 Perimeter wall 24 rib 48 Boundary plane 25 Drilling

Claims

1. Locking device with a locking cylinder (1) and a key (30), wherein the locking cylinder (1) has a cylinder core (3) mounted in a housing cavity (2), which is locked against movement by a locking element (19) in a locking position and has a key channel (10) for inserting a flat key shaft (31) of the key (30), with a head (36) of a coding element (35) projecting from a broad side (30') of the key shaft (31), which in an operative position with the key shaft (31) fully inserted into the key channel (10) moves a key element (13) for moving the locking element (19) into a release position in which the cylinder core (3) is movable, characterized by the fact thatthe head (36) is held in the working position by a spring element (40), and an obstacle (11) arranged in the insertion direction in front of the key element (13) lies in the movement path of the head (36), so that when passing the obstacle (11) the head (36) enters a cavity (39) in the key shaft (31).

2. Locking device according to claim 1, characterized by the fact that the obstacle (11) is formed by a drilling protection element (11) covering a cavity (18), in particular it is provided that two cylindrical drilling protection elements (11) are arranged in bores (12) running parallel to each other.

3. Locking cylinder for a locking device according to claim 1, comprising a cylinder core (3) mounted in a housing cavity (2), which has a locking element (19) that, in a locked position, prevents the cylinder core (3) from rotating about an axis of rotation and, in a released position, enables rotation, comprising a keying element (13) that has a sensing section (14) for scanning a coding element (35) projecting from a broad side (30') of a key shaft (31), wherein the cylinder core (3) has a key channel (10) with two spaced-apart walls (10'), characterized by the fact that at least one wall (10') of the keyway (10) has a cavity (18) arranged in the insertion direction behind a drill protection element (11), into which the probe section (14) engages in the locked position, characterized by the fact that the probe section (14) is shaded by the drilling protection element (11) in the direction of the axis of rotation.

4. Locking cylinder according to claim 3 or locking device according to claim 1, characterized by the fact that the cavity (18) for receiving the coding element (35) assuming its operative position is a section of a groove extending in the direction of the axis of rotation and open to the wall (10') of the keyway, which is crossed by the drill protection element (11).

5. Locking cylinder according to one of claims 3 or 4 or locking device according to one of claims 1 to 4, characterized by the fact that the locking element (19) is acted upon by a spring element (22) in the direction of the axis of rotation and is inserted in a bore (21) in the wall of the housing cavity (2).

6. Key for a locking device according to one of claims 1 to 5 with a flat shaft (31) having two outwardly pointing broad sides (30', 30"), wherein at least one of the broad sides (30') has a coding element (35) with a head (36) which projects in the direction away from the shaft (31) beyond a boundary plane (48) of the broad side (30'), characterized by the fact that the head (36) can be displaced below the limiting plane (48) against the restoring force of a spring element (40).

7. Key according to claim 6 or locking device according to any of the preceding claims, characterized by the fact that the coding element (35) is arranged in a recess (46) of at least one of the broad sides (30', 30") and forms a cavity (39) into which the head (36) can be inserted.

8. Key according to one of claims 6 or 7 or locking device according to one of claims 1, 2, 4, 5 or 6, characterized by the fact thatthe coding element (35) has a trough-shaped base part (38) inserted in a recess (46) of the key broad side (30') with a bottom (38') on which a compression spring (40) is supported with a first end, and a cap (37) forming the head (36) with a support surface (41') on which a second end of the compression spring (40) arranged in a cavity (39, 41) is supported.

9. Key or locking device according to claim 8, characterized by the fact that a radially outwardly projecting collar (42) of the cap (37) is covered by a retaining ring (43) which has a circumferential wall (47) with which the coding element (35) is secured in the recess (46).

10. Locking device or cylinder or key, characterized by one or more of the characterizing features of any of the preceding claims.

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