Lock system comprising a cylinder lock and a flat key

Abstract

The invention relates to a lock system with: a cylinder lock, comprising a cylindrical core (2) rotatably mounted in a housing (12) and having a keyway (20) and core pins (4) that can be moved into the keyway (20), wherein at least one core pin (4) has a engagement extension (5) at the end pointing in the direction of the keyway (20) and extending in the direction of the keyway (20); as well as a flat key (1) for locking the cylinder lock, comprising at least one encoded lateral surface (23) running along a longitudinal extension of the flat key (1) and with control points arranged along the longitudinal extension, wherein at least one milled notch (6) is provided at at least one control point, which is designed for receiving the engagement extension (5) when introducing the flat key (1) into the keyway (20).

Description

[0001] The invention relates to a locking system with a cylinder lock and a flat key for locking the cylinder lock.

[0002] Locking systems with a cylinder lock and a flat key for locking the cylinder lock are known from the prior art. These systems comprise cylinder locks with a keyway for receiving a flat key and core pins movable into the keyway. In particular, it is known to shape the core pins of the cylinder lock such that they have a scanning extension at their end facing the keyway, which extends from a base body of the core pin toward the keyway. It is also known to design the scanning extensions of the core pins such that they are narrower than the base body of the core pin and are aligned in particular in the longitudinal direction of the keyway.

[0003] Matching flat keys comprise a coded side surface running along their longitudinal extent with control points arranged along the longitudinal extent, wherein at least one control point is provided with a cut milling which also runs in the longitudinal direction.

[0004] When the flat key is inserted into the keyway, the sensing extension of the core pin is pressed or pulled into the cutout in such a form-fitting manner that the core pin releases the dividing plane between the cylinder housing and cylinder core, and the key locks the lock. In addition to the depth of the cutout, it is also known to vary the position of the cutout transverse to the longitudinal extent of the keyway. This allows sensing extensions to be provided that are offset to the left or right of the central longitudinal plane of the keyway, thus creating a further variation option. Furthermore, it is known to arrange lateral grooves in addition to the cutout, which can be interrogated by sensing elements arranged laterally in the keyway. Such laterally coded keys are known, for example, from US 2004 / 237614 A1.A system developed by the applicant with internal coding is known under the term ICS and is described in the documents EP 1 816 288 A2 and US 2011 126 600 A1. It is also known from the document EP 2 388 416 A2 to arrange lateral grooves next to the milled cut.

[0005] However, there is a need for further variations of such locking systems. It should be emphasized that the additional coding on the key is difficult to detect, especially from the broad side of the key, i.e., the side of the key with the largest dimensions, as this is particularly easy to photograph and thus copy.

[0006] It is therefore, among other things, an object of the invention to provide a locking system which increases the variation possibilities of conventional locking systems and offers increased functional reliability compared to conventional locking systems.

[0007] These and other objects are achieved according to the invention by a locking system according to claim 1.

[0008] A locking system according to the invention comprises a cylinder lock and at least one flat key for locking the cylinder lock. The cylinder lock comprises a cylinder core rotatably mounted in a housing, having a keyway and core pins movable in the keyway. At least one core pin has a sensing extension at its end facing the keyway, which extends in the direction of the keyway. The flat key has at least one coded side surface running along the longitudinal extent of the flat key, with control points arranged along the longitudinal extent. At least one control point has at least one milled recess designed to accommodate the sensing extension when the flat key is inserted into the keyway.

[0009] According to the invention, the flat key has a recess designed to accommodate a projection of the core pin when the flat key is inserted into the keyway. The features of the locking system are designed according to the invention such that when the flat key is removed from the keyway, the core pin is lifted a sufficient distance to ensure that the projection can completely leave the recess.

[0010] According to the invention, the recess can be arranged offset from the cutout along the transverse extent of the flat key. The recess can be designed to receive, in particular in a form-fitting manner, the projection of the core pin, wherein the projection extends from the base body of the core pin toward the keyway.

[0011] According to the invention, the recessed milling of the flat key and the scanning extension of the corresponding core pin can be designed in such a way that when the flat key is removed from the keyway, the projection is completely removed from the recess.

[0012] According to the invention, it can be provided for this purpose that the cut-out milling has a guide surface which interacts with a control surface on the scanning extension of the core pin in such a way that when the flat key is removed, the projection is moved completely out of the keyway.

[0013] Furthermore, the projection can be designed in such a way that when the flat key is removed, it strikes a stop of the flat key if the projection is not moved completely out of the recess.

[0014] The longitudinal extent of the cut milling, i.e. its extent in the longitudinal direction of the flat key, can be greater than the longitudinal extent of the scanning extension, i.e. its extent in the longitudinal direction of the key channel.

[0015] The shape of the scanning extension can correspond to the shape of the guide surface of the incision milling, at least in the area of ​​a control surface, so that the scanning extension can be guided along the guide surface. For example, the scanning extension can have a slightly curved or rounded shape in the area of ​​a control surface.

[0016] The shape of the projection can essentially correspond to the shape of the recess, so that in the position in which the scanning extension engages completely in the notch milling, the projection engages in the recess in a form-fitting manner.

[0017] The base body of the core pin is preferably cylindrical, while the scanning extension can, in principle, be of any shape. The core pin may have not only the scanning extension for engaging a milled recess, but also a projection on the base body of the core pin, which, however, is recessed relative to the scanning extension.

[0018] To accommodate the projection, a special recess can be provided on the key, offset from the cutout. To lock the lock, both the scanning extension and the projection of the core pin must fit precisely into the cutout or this special recess, so that the core pin is correctly displaced and clears the cylinder lock's division plane.

[0019] When the key is removed, the scanning extension is lifted out of the cutout. To prevent jamming, the cutout can be designed with a circular cross-section—this often occurs naturally during the cutting process of the cutting tool.

[0020] The scanning extension of the core pin can extend beyond the projection by at least the distance by which the projection extends relative to the base body of the core pin. This ensures that when the key is removed, the core pin is lifted a sufficient distance to ensure that the projection can completely leave the recess.

[0021] This eliminates the need to provide the recess with a circular cross-section to lift the projection out—the recess can therefore also be provided with a rectangular stop. The coordinated shapes of the recess, the scanning extension, and the projection on the core pin ensure that the projection is lifted out of the recess via this stop when the key is removed, preventing it from jamming.

[0022] Optionally, the base body of the core pin can be substantially cylindrical, with the scanning extension being narrower than the diameter of the base body and extending substantially in the axial direction of the base body. This allows the scanning extension to scan a narrow cut-out on the key. It can also be provided that the scanning extensions of different core pins are offset from one another in order to scan cut-outs that are offset relative to a central longitudinal plane of the key.

[0023] The scanning extension can, in particular, have a substantially rectangular cross-section and be oriented in the longitudinal direction of the keyway. Preferably, the scanning extension can have side surfaces that extend in the axial direction from the base body. In this case, the scanning extension can essentially have the shape of a rectangular web that extends from a cylindrical base body in its axial direction.

[0024] The projection can be arranged directly adjacent to the scanning extension in the transverse direction of the keyway. The transverse direction of the keyway refers to a direction oriented essentially at right angles to the longitudinal extent of the keyway. In this case, the projection is located directly next to the scanning extension at the tip of the base body of the core pin.

[0025] However, a groove can also be provided between the sensing extension and the projection. The width of the groove can preferably be greater than or equal to the thickness of the sensing extension. The thickness refers to the extent of the sensing extension in the transverse direction of the keyway.

[0026] If necessary, it can be provided that the core pin is pressed into the keyway by a spring force, for example via a spiral spring arranged in the cylinder housing.

[0027] However, it can also be provided that a ferromagnetic element is provided in the core pin, preferably in the scanning extension. In this case, the core pin can be pulled toward the keyway by a magnetic element in the key. Alternatively, a magnetic element can also be arranged in the core pin and a ferromagnetic element in the key.

[0028] Optionally, the scanning extension may be provided to taper toward the keyway. In particular, the scanning extension may be in the shape of a semicircle, a flattened isosceles triangle, or an isosceles trapezoid. The scanning extension may have a flattened tip and flank surfaces extending toward the tip.

[0029] This ensures that the scanning extension can slide unhindered along a correspondingly shaped cut-out in the form of a circular segment of a flattened triangle or a trapezoid when the key is removed and thus does not block the removal movement of the key.

[0030] For this purpose, a separate control surface can also be arranged on the scanning extension, preferably at the point on the scanning extension closest to the keyway. The control surface can have an outer curvature that corresponds to the inner curvature of the cut-out milling.

[0031] The projection according to the invention, which is preferably arranged next to the sensing extension, can have an engagement surface. The engagement surface of the projection can be shaped to engage the recess of the key. The engagement surface can be arranged substantially parallel to the control surface at the tip of the sensing extension and preferably form a right angle with the side surface of the sensing extension.

[0032] Furthermore, it can be provided that the projection of the core pin has a retaining surface extending obliquely to the key channel, and the stop has a corresponding side wall extending obliquely to the longitudinal extension of the flat key.

[0033] The retaining surface and the side wall can be designed such that the retaining surface abuts the side wall when the flat key is removed, unless the projection is completely removed from the recess. The retaining surface and the side wall can be designed with an undercut such that the core pin cannot move in its axial direction when the flat key is inserted.

[0034] The retaining surface can enclose an angle greater than 0°, preferably 5° to 30°, particularly preferably 15°, with the side surface of the scanning extension and an angle less than 90°, preferably 60° to 85°, particularly preferably 75°, with the engagement surface.

[0035] A chamfer may be arranged between the retaining surface and the engagement surface to facilitate the insertion of the key. The retaining surface may form an undercut, viewed in the axial direction of the base body. In In conjunction with a similarly undercut flank of the key's recess, this ensures that the core pin is guided along the retaining surface when the key is inserted and removed, and cannot move within the recess once the key is inserted. This provides an additional security feature. This undercut has the particular advantage that it can only be detected on the key with considerable effort, effectively preventing the insertion of a key without an undercut.

[0036] A flat key for such a locking system comprises at least one coded side surface running along the longitudinal extent of the flat key, with control points arranged along the longitudinal extent. At least one cutout milling is provided at at least one control point. The cutout milling can have a first depth substantially normal to the side surface. At this control point of the flat key, a recess with a second depth substantially normal to the side surface can be provided, wherein the cutout milling and the recess are arranged offset from one another, in particular adjacent to one another, transversely to the longitudinal extent of the flat key. Optionally, the second depth is at most half the size of the first depth.

[0037] Such a key therefore not only has a cutout with a defined depth for coding at a control point, but also a recess that is offset from the cutout in the transverse direction of the key. This allows for several possible variations at this control point.

[0038] In addition, the recess can be shallower than the cutout, up to a maximum of half as deep. The core pin, which engages the cutout and recess to lock the lock, must completely leave the cutout when the key is removed. Because the cutout is at least twice as deep as the recess, it is inevitable that the core pin will leave the recess when it is completely removed from the cutout. Since the core pin is thus completely lifted out of the recess via the cutout, the recess can be provided with a steep flank or other form of stop on which unauthorized keys would get stuck.

[0039] The side surface can be the narrow side of the flat key. The side surface can also be the broad side of the flat key.

[0040] The cut-out milling can be narrower than the side surface. In particular, it can have an extension transverse to the longitudinal extension of the flat key, preferably one-third of the extension of the side surface. Two or more cut-out millings can be provided transverse to the longitudinal extension of the flat key.

[0041] The recessed milling can be curved and preferably essentially circular, forming an internal circular guide surface. This design allows the core pin to be guided along the guide surface as smoothly as possible during key insertion and removal.

[0042] The recess does not have to be curved or circular, but can have a base surface that runs essentially parallel to the side surface. This allows for a particularly good, positive engagement of an authorized core pin in the recess. A stop can preferably be formed between the side surface and the recess to prevent an unauthorized core pin from locking when the key is removed. The side surface can also merge into the recess via a stop.

[0043] The stop can have a side wall arranged at an angle of 60° to 90°, preferably 75° to 90°, particularly preferably 90° to the side surface. If the angle is less than 90°, this offers the advantage according to the invention that an undercut is formed, so that a core pin formed with a correspondingly matching undercut is no longer movable in the axial direction when inserted.

[0044] Optionally, it may further be provided that at least one ferromagnetic element is provided on the flat key at at least one control point for exerting an attractive force on at least one core pin of the cylinder lock. For this purpose, a magnetic element may be provided in the core pin. Alternatively, it may be provided that a magnetic element is provided at the control point in the key and a ferromagnetic element is provided in the core pin.

[0045] This eliminates the need for a spring element, such as a coil spring, to preload the core pin. Furthermore, it also enables additional magnetic coding.

[0046] The recess may be formed directly adjacent to the cutout. Alternatively, a web may be provided between the cutout and the recess to guide a core pin of the cylinder lock.

[0047] Further features of the invention emerge from the claims, the embodiments and the figures.

[0048] The invention is explained in more detail below using non-limiting embodiments. Fig. 1 shows a schematic three-dimensional representation of a key-lock combination from the prior art. Fig. 2 shows a schematic cross-sectional view of a combination of a cylinder lock according to the invention with a conventional flat key. Fig. 3 shows a schematic three-dimensional representation of a key-lock combination according to the invention, wherein only the core pin and a detail of the key are shown. Fig. 4 shows a schematic three-dimensional representation of a key according to the invention. Fig. 5 shows a schematic sectional view of a key-lock combination according to the invention. Fig. 6a - 6e show views of a core pin of a cylinder lock according to the invention. Fig. 7a - 7c show a schematic three-dimensional representation of a key-lock combination according to the invention, wherein in the Figur 7b a schematic three-dimensional representation of a key according to the invention and in the Figuren 7a und 7c the core pin and details of the key are shown. Fig. 8 shows a schematic three-dimensional representation of another key-lock combination according to the invention. Fig. 9 shows a schematic three-dimensional representation of a core pin of a cylinder lock according to the invention.

[0049] Fig. 1 shows a schematic three-dimensional representation of a prior art key-lock combination. The flat key 1 is inserted into the keyway 20 of the cylinder core 2 of a cylinder lock. The cylinder lock comprises, in a known manner, a housing 12 with spring-loaded housing pins 3 and a rotatable cylinder core 2 with core pins 4. Housing pins 3 and core pins 4 are arranged in correspondingly aligned bores in the housing 12 and cylinder core 2. The core pins 4 are constructed in such a way that they have a cylindrical base body 19 and, adjoining it, a web-shaped scanning extension 5. The scanning extensions 5 are narrower than the diameter of the base body 19 and aligned in the longitudinal direction of the keyway 20.

[0050] The flat key 1 has recesses 6 of varying depth at defined control points on its narrow side. The scanning extensions 5 are designed to scan the recesses 6. To prevent the scanning extensions 5 from blocking when inserting and removing the flat key 1, the recesses 6 have a substantially circular cross-section, so that the core pins 4 are guided along the curved base surface of the respective recess 6 to their respective end positions. In the illustrated state, all housing pins 3 are located at the dividing plane between the housing 12 and the cylinder core 2, so that the cylinder core 2 can rotate in the housing 12 and lock the lock.

[0051] Fig. 2 shows a schematic cross-sectional view of a cylinder lock according to the invention with a conventional flat key 1. The flat key 1 is inserted into the keyway 20 of the cylinder core 2 of a cylinder lock. The cylinder lock comprises, in a known manner, a housing 12 with spring-loaded housing pins 3 and a rotatable cylinder core 2 with core pins 4.

[0052] The housing pins 3 and core pins 4 are arranged in correspondingly aligned bores in the housing 12 and cylinder core 2. The core pins 4 are constructed in such a way that they have a cylindrical base body 19 and adjoining it a web-shaped sensing extension 5. The sensing extensions 5 are narrower than the diameter of the base body 19 and are aligned in the longitudinal direction of the key channel 20. In addition, one of the core pins 4 has a projection 9 at its end pointing towards the key channel 20, which extends from the base body 19 of the core pin 4 towards the key channel 20. The sensing extension 5 projects beyond the projection 9 by approximately twice the distance by which the projection 9 extends relative to the base body 19.

[0053] Again, the flat key 1 has on its narrow side at defined control points cut-outs 6 with different depths, analogous to the flat key 1 from the Fig. 1 shown embodiment. In the situation shown, however, the core pin 4 with the projection 9 remains stuck on the cutout 6 of the flat key 1, since the flat key 1 does not have a correspondingly shaped recess (7) for the positive reception of the projection 9. The corresponding housing pin 3 does not release the division plane, and the lock is blocked.

[0054] Fig. 3 shows a schematic three-dimensional representation of a key-lock combination according to the invention, wherein only the core pin 4 and a detail of the flat key 1 at a control point are shown. The flat key 1 has a side surface 23 on its narrow key side, in which a recess 6 is formed. The recess 6 serves to accommodate a sensing extension 5 of the core pin 4. The core pin 4 has a cylindrical base body 19, from which the sensing extension 5 extends. Also extending from the cylindrical base body 19 is a projection 9, which in this embodiment is directly adjacent to the sensing extension 5. The projection 9 extends approximately one-third of the length of the sensing extension 5 from the base body 19.

[0055] For the positive reception of the projection 9, a recess 7 is formed on the flat key 1. The recess 7 is located in the longitudinal extension of the key essentially in the central position relative to the cut-out 6.

[0056] The recess 7 merges into the side surface 23 of the flat key 1 via a stop 8 with a steep flank. The recessed milling 6 and the scanning extension 5 are designed such that when the flat key 1 is removed, the projection 9 is completely lifted out of the recess 7.

[0057] In particular, the recess 6 has a circular arc-shaped guide surface 11, which interacts with a slightly curved control surface 13 on the scanning extension 5 in such a way that when the flat key 1 is removed, the projection 9 is moved completely out of the recess 7. With unauthorized keys, however, the projection 9 remains stuck on the abrupt flank of the stop 8, preventing the key from being removed.

[0058] Fig. 4 shows another schematic three-dimensional representation of a key according to the invention, this time without the core pin 4. Visible is the side surface 23 of the narrow side of the key, on which the cut-out 6 is located.

[0059] The width of the cutout 6 is approximately 1 / 4 of the width of the key's narrow side. The cutout 6 has a curved, essentially circular-arc-shaped guide surface 11. Immediately adjacent to the cutout 6 is the recess 7, which merges into the side surface 23 via a specially shaped stop 8. The side wall 24 of the stop 8 is arranged at an angle of approximately 90° to the side surface 23.

[0060] The recess 7 has a significantly smaller depth x than the cut milling 6. In the present embodiment, the depth of the recess (7) is approximately 1 / 3 of the depth of the cut milling 6.

[0061] Fig. 5 shows a schematic sectional view of a key-lock combination according to the invention, showing two control points A and B. The cylinder lock comprises a cylinder core 2 rotatable in a housing 12. Housing pins 3 and core pins 4 are provided in aligned bores at defined control points.

[0062] At control point B, a conventional system is shown, wherein the housing pin 3 is pressed into the key channel 20 via a spiral spring.

[0063] At control point A, however, no coil spring is provided. A ferromagnetic element 10 is provided at this control point in the flat key 1, which interacts with a magnetic element (not shown) in the core pin 4 at this control point. Therefore, the core pin 4 is not pressed into the cutout 6 by a spring force at this control point, but rather is drawn into the cutout 6 by a magnetic force. This opens up further variation possibilities.

[0064] The incision milling 6 has a circular arc-shaped guide surface 11 at the control point A for guiding the scanning extension 5 of the core pin 4.

[0065] The core pin 4, in turn, has a cylindrical base body 19, from which a projection 9 and the scanning extension 5 extend. It can again be seen that the length of the projection 9 is approximately 1 / 3 of the length of the scanning extension 5.

[0066] Fig. 6a - 6e show views of a core pin 4 of a cylinder lock according to the invention in a three-dimensional representation as well as in two-dimensional views from four sides. The views show the cylindrical base body 19, from which the scanning extension 5 and the projection 9 extend in the axial direction. The scanning extension 5 has the shape of a web 17 with a rectangular cross-section. As shown in Fig. 6c und Fig. 6e As can be seen, the scanning extension 5 is not located centrally, but is slightly offset relative to the longitudinal axis of the base body 19.

[0067] The scanning extension 5 has two side surfaces 22 that extend in the axial direction of the base body 19. A projection 9 is arranged directly next to the scanning extension 5, which also extends from the base body 19 in the axial direction. However, the scanning extension 5 is considerably longer, as shown in Fig. 6d is apparent. Specifically, the scanning extension 5 extends a distance y+z from the base body 19, while the projection 9 extends only a distance y from the base body 19. The value of z is approximately twice the value of y.

[0068] In In the illustrated embodiment, the scanning extension 5 tapers toward the keyway 20, i.e., toward its tip. Specifically, the scanning extension 5 has the shape of an isosceles triangle flattened at its tip, with side surfaces 14 that enclose an angle of approximately 45° with the end face of the cylindrical base body 19.

[0069] At the tip of the scanning extension 5, a control surface 13 is provided, which is slightly curved to enable blockage-free scanning of the guide surface 11 of the incision milling 6. For this purpose, the control surface 13 is also provided with chamfered side edges.

[0070] For positive engagement in the recess 7 on the key, the projection 9 has a specially shaped engagement surface 21, which is arranged substantially parallel to the control surface 13 and substantially parallel to the end face of the cylindrical base body 19. The engagement surface 21 forms a substantially right angle with the side surface 22 of the scanning extension 5.

[0071] Adjacent to the engagement surface 21 is a retaining surface 16, which forms an angle α of approximately 15° with the side surface 22 of the scanning extension 5 and an angle of approximately 75° with the engagement surface 21. A chamfer 15 is formed between the retaining surface 16 and the engagement surface 21. In the axial direction of the base body 19, the inclined retaining surface 16 forms an undercut, so that the inserted core pin 4 cannot be removed from the recess 7 in the axial direction.

[0072] The Figuren 7a und 7c show a schematic three-dimensional representation of a key-lock combination according to the invention, wherein only the core pin 4 and details of the flat key 1 at a control point are shown. The flat key 1 has a side surface 23 on its broad side in which a recess 6 is formed. The recess 6 serves to accommodate a scanning extension 5 of the core pin 4.

[0073] The core pin 4 has a cylindrical base body 19, from which the scanning extension 5 extends. A projection 9 also extends from the cylindrical base body 19, which in this embodiment is directly adjacent to the scanning extension 5.

[0074] A recess 7 is formed on the flat key 1 for the positive reception of the projection 9.

[0075] The recess 7 merges into the side surface 23 of the flat key 1 via a stop 8 with a steep flank. The recessed milling 6 and the scanning extension 5 are designed such that when the flat key 1 is removed, the projection 9 is completely lifted out of the recess 7.

[0076] In particular, the recess 6 has a circular arc-shaped guide surface 11, which interacts with a slightly curved control surface 13 on the scanning extension 5 in such a way that when the flat key 1 is removed, the projection 9 is moved completely out of the recess 7. With unauthorized keys, however, the projection 9 remains stuck on the abrupt flank of the stop 8, preventing the key from being removed.

[0077] The Figur 7b shows a schematic three-dimensional representation of the key of the Figur 7a , whereby the core pin 4 is not shown this time. Visible is the side surface 23 of the key's broad side, on which the cut-out milling 6 is located.

[0078] The width of the cut-out 6 is approximately 1 / 10 of the width of the key broadside.

[0079] The notch milling 6 has a curved, essentially circular-arc-shaped guide surface 11. Immediately adjacent to the notch milling 6 is the recess 7, which merges into the side surface 23 via a specially shaped stop 8. The side wall 24 of the stop 8 is arranged at an angle of approximately 90° to the side surface 23.

[0080] The recess 7 has a significantly smaller depth x than the cut-out milling 6. In the present embodiment, the depth of the recess 7 is approximately 1 / 3 of the depth of the cut-out milling 6.

[0081] Fig. 8 shows a schematic three-dimensional representation of another key-lock combination according to the invention, wherein only the core pin 4 of the lock, designed according to the invention, is shown. In this exemplary embodiment, the recess 6 with the guide surface 11 and the recess 7 on the key are not arranged directly next to each other, but rather a web 17 is provided between them. The web 17 serves in particular to guide the core pin 4 of the cylinder lock.

[0082] Fig. 9 shows a schematic three-dimensional representation of the core pin 4 of a cylinder lock according to the invention according to the embodiment of Fig. 7 . On the core pin 4, between the scanning extension 5 and the projection 9, a groove 18 is provided, which serves to engage in the web 17 described above.

[0083] The invention is not limited to the embodiments presented here, but encompasses all locking systems according to the following patent claims.

[0084] The term “cut-off milling” should not be limited to recesses in the key that were made by a milling tool, but includes cuts in the key side that were made by any method.

[0085] In particular, the invention is not limited to circular arc-shaped incision millings, but encompasses all incisions that are suitable for moving the corresponding core pin in such a way that a projection on the core pin is moved over a stop on the key.

[0086] The recess according to the invention can extend partially or completely along a side surface of the flat key. Thus, an embodiment can also be provided in which the recess extends partially or completely along a side surface of the flat key. If the recess extends completely along a side surface of the flat key, the recess thus forms the side surface of the key.

[0087] In this embodiment, the first depth of the cutout and the second depth of the recess are measured relative to another reference surface, preferably relative to the opposite side surface of the flat key. In the absence of a common reference surface, the feature that "the second depth is smaller, preferably at most half as large as the first depth" is to be understood in this embodiment as meaning that the extent of the recess relative to the other reference surface is greater than the extent of the cutout relative to the other reference surface.

[0088] If necessary, multiple recesses can be provided, with the second depth of each recess determining whether the corresponding core pin can penetrate deeply enough into the cutout of the flat key. Preferably, the second depth of the recess is adapted to the geometry of the core pin. For example, if the second depth of a recess is not large enough, the projection of the core pin may prevent the scanning attachment from fully penetrating the cutout. Bezugszeichenliste

[0089] 1Flat key 2Cylinder core 3Housing pin 4Core pin 5Sensing extension 6Cut-off milling 7Recess 8Stop 9Protrusion 10Ferromagnetic element 11Guide surface 12Housing 13Control surface of the sensing extension 14Leg surface of the sensing extension 15Bevel 16Retaining surface of the projection 17Bridge 18Groove 19Base body 20Keyway 21Engagement surface of the projection 22Side surface of the sensing extension 23Side surface of the flat key 24Side wall of the stop

Claims

1. A locking system with a cylinder lock, comprising a. a cylinder core (2) rotatably mounted in a housing (12) and comprising a keyway (20) and core pins (4) that can be moved into the keyway (20), wherein b. at least one core pin (4) has a scanning extension (5) at its end pointing towards the keyway (20) extending towards the keyway (20), as well as a flat key (1) for locking the cylinder lock, comprising: c. at least one encoded lateral surface (23) running along a longitudinal extension of the flat key (1) and having control points arranged along the longitudinal extension, wherein d. at least one incision milling (6) is provided at at least one control point, which is designed to receive the scanning extension (5) when the flat key (1) is inserted into the keyway (20), characterised in that the flat key (1) has a recess (7) which is designed to receive a projection (9) of the core pin (4) when the flat key (1) is inserted into the keyway (20), wherein the locking system is designed in such a way that, when the flat key (1) is pulled out of the keyway (20), the core pin is lifted by a sufficient distance to ensure that the protrusion can fully exit the recess.

2. The locking system according to claim 1, characterised in that the recess (7) is arranged offset from the incision milling (6) along the transverse extension of the flat key (1).

3. The locking system according to claim 1 or 2, characterised in that the recess (7) of the flat key (1) is designed to receive, in particular positively receive, the projection (9), wherein the projection (9) extends from the base body (19) of the core pin (4) towards the keyway (20).

4. The locking system according to one of claims 1 to 3, characterised in that the incision milling (6) of the flat key (1) and the scanning extension (5) of the core pin (4) are designed in such a way that, when the flat key (1) is pulled out of the keyway (20), the projection (9) is completely removed from the recess (7).

5. The locking system according to one of claims 1 to 4, characterised in that the incision milling (6) of the flat key (1) has a guide surface (11) which interacts with a control surface (13) on the scanning extension (5) of the core pin (4) in such a way that, when the flat key (1) is pulled out, the projection (9) is completely moved out of the recess (7).

6. The locking system according to one of claims 1 to 5, characterised in that the projection (9) of the core pin (4) is designed in such a way that the projection (9) abuts a stop (8) of the flat key (1) when the flat key (1) is pulled out, if the projection (9) is not completely removed from the recess (7).

7. The locking system according to one of claims 1 to 6, characterised in that the longitudinal extension of the incision milling (6) is greater than the longitudinal extension of the scanning extension (5).

8. The locking system according to one of claims 5 to 7, characterised in that the shape of the scanning extension (5) corresponds to the shape of the guide surface (11) of the incision milling (6), so that the scanning extension (5) can be guided along the guide surface (11).

9. The locking system according to one of claims 1 to 8, characterised in that the shape of the projection (9) substantially corresponds to the shape of the recess (7), so that the projection (9) positively engages in the recess (7) in the position in which the scanning extension (5) engages entirely in the incision milling (6).

10. The locking system according to one of claims 1 to 9, characterised in that the projection (9) has a retaining surface (16) extending obliquely to the keyway (20) and the stop (8) has a corresponding side wall (24) extending obliquely to the longitudinal extension of the flat key (1).

11. The locking system according to claim 10, characterised in that the retaining surface (16) and the side wall (24) are designed in such a way that the retaining surface (16) abuts the side wall (24) when the flat key (1) is pulled out, if the projection (9) is not completely removed from the recess (7).

12. The locking system according to one of claims 10 or 11, characterised in that the retaining surface (16) and the side wall (24) are undercut in such a way that the core pin (4) is not movable in its axial direction in the inserted state of the flat key (1).

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