CYLINDER LOCK

Description

[0001] The invention relates to a cylinder lock with a cylinder core rotatably mounted in a cylinder housing with a key channel for receiving a key.

[0002] Such cylinder locks have long been state-of-the-art. Over time, various methods have developed to manipulate these locks using special locking tools. Of these methods, the striking method, which uses a so-called adapter key, has become particularly well-known. An adapter key has a bit with a series of consecutive prongs for the corresponding core pins of the cylinder core. If the inserted adapter key, and thus the cylinder core, is slightly turned, a single strike on the key in the axial direction of the cylinder core is sufficient to open the cylinder lock.

[0003] The teeth of the adapter key are pressed against the pin tumblers at high acceleration, causing the core pins and housing pins to experience strong acceleration against the pin springs. This causes a bouncing motion between the core pins and the corresponding housing pins, causing them to briefly move apart. The cylinder core is released by the torsional tension, because none of the core pins or housing pins protrudes through the surface of the cylinder core bore.

[0004] EP 1 746 228 A2 and GB 2 239 040 A show cylinder locks with core pin holes which are extended by a circumferential groove.

[0005] The object of the invention is to solve this problem and to provide a cylinder lock which is robust against the application of the impact method.

[0006] This and other problems are solved by a cylinder lock according to claim 1.

[0007] A cylinder lock according to the invention has a cylinder core rotatably mounted in a cylinder housing with a key channel for receiving a key.

[0008] Core pin bores running radially in the cylinder core are provided, with core pins mounted therein for displacement and preload. Furthermore, housing pin bores running in the cylinder housing are provided, with housing pins mounted therein for displacement and preload. Each core pin bore is assigned to a housing pin bore, and each core pin is assigned to a housing pin.

[0009] Furthermore, a parting plane is formed between the cylinder core and the cylinder housing such that the cylinder core is rotatable relative to the cylinder housing when the parting plane is free.

[0010] According to the invention, at least one extended core pin bore is provided, which widens into a circumferential groove on the outer circumference of the cylinder core. This circumferential groove is at least as wide as the housing pin that is mounted in the housing pin bore associated with the extended core pin bore.

[0011] Because the extended core pin bore expands into a circumferential groove, the housing pin can penetrate the circumferential groove when applying the impact method. However, when further rotating the cylinder core, the housing pin then gets stuck on an edge of the circumferential groove, preventing the cylinder core from being fully rotated when applying the impact method.

[0012] According to the invention, the extent of the circumferential groove on the outer circumference of the cylinder core can be so short that the housing pin belonging to the circumferential groove cannot fully enter the circumferential groove if the core pin associated with the housing pin is located on the division plane. In other words, the circumferential groove is shorter on each side of the core pin than the diameter of the associated housing pin. This ensures that when the cylinder core is actuated with a key authorized to lock, the housing pin does not accidentally enter the circumferential groove but remains in the division plane.

[0013] In particular, the length of the circumferential groove can be provided to correspond to a maximum of three times the diameter of the enlarged core pin bore. If the circumferential groove is designed symmetrically to the core pin bore, this essentially defines the maximum extension of the circumferential groove in the circumferential direction. In practice, a length of the circumferential groove in the range of twice the diameter of the enlarged core pin bore has proven particularly advantageous.

[0014] According to the invention, the enlarged core pin bore can be arranged substantially centrally along the extension of the circumferential groove. The circumferential groove is located on both sides of the enlarged core pin bore and extends over a maximum of 90% of the diameter of the enlarged core pin bore.

[0015] According to the invention, the circumferential groove can be at least 80% longer than the diameter of the enlarged core pin bore. This dimensioning is advantageous because it ensures that in the event of a break-in attempt, the corresponding housing pin will most likely get caught in the circumferential groove, thus preventing further rotation of the cylinder core.

[0016] According to the invention, the enlarged core pin bore can be arranged substantially centrally along the extension of the circumferential groove, with the circumferential groove extending on both sides of the enlarged core pin bore by at least approximately 20% of the diameter of the enlarged core pin bore. This dimensioning has also proven particularly advantageous in practice.

[0017] According to the invention, the circumferential groove can have a shallower depth than the extended core pin bore, preferably a depth corresponding to approximately 20% to 50% of the depth of the extended core pin bore. This dimensioning allows a housing pin to securely penetrate and remain in the circumferential groove during a break-in attempt, thus preventing the lock from being unlocked, even if an attempt is made to manually push the housing pin out of the circumferential groove and back into the housing.

[0018] According to the invention, the core pin associated with the enlarged core pin bore can have a circumferential stop shoulder at its end facing the cylinder housing. The stop shoulder can be designed, in particular, as a collar or bead surrounding the tip of the core pin.

[0019] The stop shoulder interacts with an edge of the circumferential groove in such a way that the radial movement of the core pin in the enlarged core pin bore is limited. This design is advantageous because it limits the movement of the core pin in the enlarged core pin bore. This results in two advantages: Firstly, it ensures that the core pin does not protrude too far into the keyway, thus offering little surface area for an adapter key to engage. Furthermore, the momentum transmitted to the core pin when applying the impact method is limited by the short distance traveled by the core pin.

[0020] According to the invention, the cylinder core can have two or more scanning positions in the insertion direction of a key, wherein the enlarged core pin bore is preferably not located at the first scanning position in the insertion direction. This embodiment has proven advantageous in practice.

[0021] According to the invention, an extended core pin can be provided at a core pin bore other than the extended core pin bore, which is longer than the core pin associated with the extended core pin bore.

[0022] By providing both short and long core pins in one and the same lock, the application of the striking method is made even more difficult.

[0023] For example, a striking key designed to strike a short core pin down to the division plane will inevitably strike a long core pin down to the housing, so that the division plane is again blocked.

[0024] According to the invention, at least one additional core pin can have a stop shoulder, which is preferably longer than the stop shoulder of the core pin associated with the extended core pin bore. The arrangement of such a stop shoulder on additional core pins makes it possible to limit the extension of the respective core pin into the keyway by means of corresponding steps in the associated core pin bores, which in turn can make the application of the impact method more difficult.

[0025] According to the invention, at least one of the housing pins can have an annular step at least on its end facing the cylinder core. In particular, the housing pin can have an annular step on both ends. This can ensure that the housing pin better blocks rotation of the cylinder core when applying the impact method.

[0026] The depth of the circumferential groove can preferably be greater than the extension of the step at the end of the housing pin facing the cylinder core. This ensures that the step of the housing pin fully penetrates the circumferential groove when the impact method is applied. This also ensures that the housing pin better blocks rotation of the cylinder core when the impact method is applied.

[0027] Further features of the invention emerge from the claims, the figures and the following description of the embodiments.

[0028] The invention will now be explained in more detail using an exemplary embodiment. The figures show: Fig. 1a is a schematic three-dimensional representation of an embodiment of a cylinder lock according to the invention; Fig. 2a - 2b a schematic sectional view of the embodiment of Fig. 1a using a locking key; Fig. 3a - 3b a schematic sectional view of the embodiment from Fig. 1a using a non-locking key.

[0029] Fig. 1a is a schematic three-dimensional representation of an embodiment of a cylinder lock according to the invention.

[0030] Shown is a cylinder lock 1 with a cylinder core 2 rotatably mounted in the cylinder housing 3. The cylinder core 2 has a keyway 11 for receiving a key (not shown). Radial core pin bores 4 and 4' extend within the cylinder core 2, with slidably mounted and preloaded core pins 5 and 5', as well as an extended core pin 5".

[0031] Housing pin bores 6 and 6' also extend in the cylinder housing 3. Movable and forward-mounted housing pins 7 and 7' are mounted in the housing pin bores 6 and 6'. Some of the housing pins 7, 7' each have an annular step 12 at the end facing the cylinder core 2. These housing pins 7, 7' also each have an annular step 12 at the end facing away from the cylinder core 2. However, a housing pin without this step is also provided.

[0032] Each of the core pin bores 4 and 4' is assigned to a housing pin bore 6 and 6'. Each core pin 5 and 5' is assigned to a housing pin 7 and 7'. This forms a parting plane between the cylinder core 2 and the cylinder housing 3, so that the cylinder core 2 is rotatable relative to the cylinder housing 3 when the parting plane is free.

[0033] An enlarged core pin bore 4' is provided, which is located on the outer circumference of the cylinder core 2. The core pin bore 4' widens into a circumferential groove 8. This circumferential groove 8 is at least as wide as the housing pin 7' that is mounted in the associated housing pin bore 6'.

[0034] This allows the housing pin 7' to penetrate into the circumferential groove even if the cylinder core 2 is slightly rotated relative to the cylinder housing 3.

[0035] Fig. 2a - 2b a schematic sectional view of the embodiment from Fig. 1a using a locking key.

[0036] Shown is a cylinder lock 1 with a cylinder core 2 rotatably mounted in the cylinder housing 3. The cylinder core 2 has a key channel 11 for receiving a key (not shown).

[0037] In the section shown, a radial core pin bore 4' runs with a displaceable and preloaded core pin 5'. A housing pin bore 6' runs in the cylinder housing 3. The core pin bore 4' is assigned to the housing pin bore 6'. A housing pin 7' is provided in the housing pin bore 6' and is displaceable and preloaded by a spring. The housing pin 7' has an annular step 12 at the end facing the cylinder core 2. The core pin 5' is assigned to the housing pin 7'.

[0038] When using a key (not shown) with locking authorization, a dividing plane is formed between the cylinder core 2 and the cylinder housing 3, so that the cylinder core 2 can be rotated relative to the cylinder housing 3 when the dividing plane is free.

[0039] The extended core pin bore 4' widens into a circumferential groove 8 on the outer circumference of the cylinder core 2. The circumferential groove 8 is at least as wide as the housing pin 7' that is mounted in the housing pin bore 6'. This allows the housing pin 7' to penetrate the circumferential groove 8 even if the cylinder core 2 is slightly rotated relative to the cylinder housing 3.

[0040] Fig. 3a - 3b shows a schematic sectional view of the embodiment of Fig. 1a using a non-locking key. The illustration contains essentially the same elements as Fig. 2a - 2b , with the difference that the case of a key that does not have locking authorization is shown.

[0041] In this illustration, the housing pin 7' projects into the circumferential groove 8, which is located on the outer circumference of the cylinder core 2. In the illustrated case, therefore, no free parting plane is formed, so that the cylinder core 2 cannot be rotated relative to the cylinder housing 3. When applying the impact method and simultaneously rotating the cylinder core 2 relative to the cylinder housing 3, the housing pin 7' remains stuck in the circumferential groove 8 and cannot be removed from the circumferential groove 8 due to its spring preload.

[0042] In the present exemplary embodiment, the circumferential groove 8 extends along the outer circumference of the cylinder core 2 for such a length that the housing pin 7' cannot enter the circumferential groove 8 if the core pin 6' associated with the housing pin 7' is located on the parting plane. Furthermore, the enlarged core pin bore 4' is arranged substantially centrally along the extent of the circumferential groove 8. The circumferential groove 8 extends on both sides of the enlarged core pin bore 4' by approximately 50% of the diameter of the enlarged core pin bore 4'. As a result, the circumferential groove 8 is approximately twice as long as the diameter of the enlarged core pin bore 4', yet it is ensured that the housing pin 7' does not inadvertently enter the circumferential groove 8.

[0043] The depth of the circumferential groove 8 in this embodiment corresponds to approximately 20% of the depth of the enlarged core pin bore 4'. The core pin 5' has a circumferentially extending stop shoulder 9 at its end facing the cylinder housing 3. This interacts with an edge of the circumferential groove 8 in such a way that the movement of the core pin 5' in the enlarged core pin bore 4' is limited, specifically in a region that corresponds approximately to the depth of the circumferential groove 8. Furthermore, the depth of the circumferential groove 8 is greater than the extension of the step 12 at the end of the housing pin 7' facing the cylinder core 2. This ensures, as in Fig. 3b It can be seen that the step 12 can penetrate completely into the circumferential groove 8 and counteracts an unauthorized radial displacement of the housing pin 7' from the circumferential groove 8.

[0044] However, the invention is not limited to the embodiment shown here, but encompasses all cylinder locks within the scope of the following patent claims. In particular, the invention is not limited to the use of cylindrical core pins, but can also be used with other types of locking elements. Bezugszeichenliste

[0045] 1Cylinder lock 2Cylinder core 3Cylinder housing 4, 4'Core pin bore 5, 5'Core pin 5'Extended core pin 6, 6'Housing pin bore 7, 7'Housing pin 8Circumferential groove 9Stop shoulder 10Collar 11Keyway 12Annular step

Claims

1. A cylinder lock (1) with a cylinder core (2) rotatably mounted in a cylinder case (3) with a key channel (11) for receiving a key, comprising a. core pin bores (4, 4') radially extending in the cylinder core (2) with core pins (5, 5'), which are displaceable and supported in a prestressed manner therein, and b. case pin bores (6, 6') extending in the cylinder case (3) with case pins (7, 7'), which are displaceable and supported in a prestressed manner therein, wherein c. each core pin bore (4, 4') is assigned to a case pin bore (6, 6') and each core pin (5, 5') is assigned to a case pin (7, 7') and wherein d. a shear plane is formed in such a way between the cylinder core (2) and the cylinder case (3) that the cylinder core (2) is rotatable relative to the cylinder case (3), when the shear plane is unobstructed, wherein e. at least one expanded core pin bore (4') is provided, which expands into a peripheral groove (8) on the periphery of the cylinder core (2), wherein f. the peripheral groove (8) is at least as wide as the case pin (7'), which is supported in the case pin bore (6'), which is assigned to the expanded core pin bore (4'), so that this case pin (7') is able to penetrate the peripheral groove (8) characterised in that g. the core pin (5') assigned to the expanded core pin bore (4') has at its end facing the cylinder case (3) a stop shoulder (9') extending peripherally, which interacts with the edge of the peripheral groove (8) in such a way that the movement of the core pin (5') in the expanded core pin bore (4') is restricted.

2. The cylinder lock (1) according to claim 1, characterised in that the extent of the peripheral groove (8) on the periphery of the cylinder core (2) is so short that the case pin (7') is not able to enter the peripheral groove (8) when the core pin (5') assigned to the case pin (7') is on the shear plane.

3. The cylinder lock (1) according to claim 2, characterised in that the length of the peripheral groove (8) is at most three times the diameter of the expanded core pin bore (4').

4. The cylinder lock (1) according to claim 3, characterised in that the expanded core pin bore (4') is arranged substantially centrally along the extent of the peripheral groove (8), the peripheral groove (8) extending on both sides of the expanded core pin bore (4') at most about 90% of the diameter of the expanded core pin bore (4').

5. The cylinder lock (1) according to any one of claims 1 to 4, characterised in that the peripheral groove (8) is at least 80% longer than the diameter of the expanded core pin bore (4').

6. The cylinder lock (1) according to claim 5, characterised in that the expanded core pin bore (4') is arranged substantially centrally along the extent of the peripheral groove (8), the peripheral groove (8) extending on both sides of the expanded core pin bore (4') at least about 20% of the diameter of the expanded core pin bore (4').

7. The cylinder lock (1) according to any one of claims 1 to 6, characterised in that the peripheral groove (8) has a smaller depth than the expanded core pin bore (4'), preferably a depth that is about 20 % to 50 % of the depth of the expanded core pin bore (4').

8. The cylinder lock (1) according to any one of claims 1 to 7, characterised in that the cylinder core (2) has two or more sensing positions in the insertion direction of a key, the expanded core pin bore (4') preferably not being arranged at the first sensing position in the insertion direction.

9. The cylinder lock (1) according to any one of claims 1 to 8, characterised in that an elongated core pin (5") being longer than the core pin (5'), which is assigned to the core pin bore (4'), is provided at a core pin bore (4) other than the expanded core pin bore (4').

10. The cylinder lock (1) according to any one of claims 1 to 9, characterised in that at least one further core pin (5) has a stop shoulder (9), which is preferably longer than the stop shoulder (9') of the core pin (5') assigned to the expanded core pin bore (4').

11. The cylinder lock (1) according to any one of claims 1 to 10, characterised in that at least one of the case pins (7, 7') has an annular step (12) at least at its end facing the cylinder core (2).

12. The cylinder lock (1) according to claim 11, characterised in that the depth of the peripheral groove (8) is greater than the extent of the step (12) at the end facing the cylinder core (2).