Locking device with a crank, which is controlled by locking cylinders with driver plates

Abstract

In summary, the invention relates to a locking device (10) for displacing a lock bolt (30), which has an outer locking cylinder (14), in particular an outer Scandinavian oval locking cylinder (14), and an inner locking cylinder (16), in particular an inner Scandinavian oval locking cylinder (16). Furthermore, the locking device (10) has a lock case (12), the lock bolt (30), and an at least two-part crank (60). The crank (60) has a first and a second crank element (32, 34), which can be used independently of one another to displace the lock bolt (30) from a release position to a blocking position and vice versa. The first crank element (32) is arranged in a rotationally fixed manner on a first driver plate (52) of the outer locking cylinder (14), while the second crank element (34) is arranged in a rotationally fixed manner on a second driver plate (54) of the inner locking cylinder (16).To move the lock bolt (30), a key (18) must be inserted into a key receptacle (20) of the respective locking cylinder (14, 16). Furthermore, the invention relates to a method for carrying out a locking operation, in particular of the aforementioned locking device (10).

Description

BACKGROUND OF THE INVENTIONThe invention relates to a locking device in which an outer locking cylinder with driver plates and an inner locking cylinder with driver plates can be used independently of one another by means of a suitable key for displacing a lock bolt from a release position into a blocking position and vice versa. The invention further relates to a method for actuating a closing device.Locking devices for windows and / or doors can have various mechanisms which rely on different embodiments of lock cylinders. In this case, lock cylinders are often classified according to their external shape. In this way, it is possible to distinguish between profile cylinders, round cylinders and oval cylinders. Each lock cylinder class can in turn be present in different designs, which can overlap with the designs of other classes in function and handling, wherein depending on the design different advantages can arise, for example with regard to the break-in safety, assembly ability, handling, robustness or the emergency and risk function.In particular, lock cylinders which have a locking nose installed in the cylinder, with the aid of which a key movement is transmitted directly or indirectly to the lock bolt, are widely used in modern locking devices. This is often the case, for example, with conventional profile closing cylinders.In the context of the invention, the closing devices disclosed in the following publications can be listed in particular for the purpose of illustrating the prior art:DE 44 22 094 A1 discloses a lock for locking and unlocking doors, which has two profile locking cylinder cores, the locking noses of which can be used independently of one another for displacing a lock bolt.DE 27 52 089 A1 discloses a lock which has a profile locking cylinder with a first locking nose, wherein the profile locking cylinder has a second locking nose in an embodiment variant of the invention, which can be switched off or independent of the first locking nose.DE 195 18 491 A1 discloses a profile closing cylinder which has at least two closing noses which are preferably spaced apart axially along the longitudinal axis of the profile closing cylinder. At least one of the at least two closing noses is preferably divided into two closing nose halves that can be operated independently of each other.EP 3 929 380 A1 describes a locking cylinder, preferably designed as a profile locking cylinder, having a locking nose, which has a high degree of robustness with respect to attempts at intrusion.DE 1 024 842 A discloses a lock which has two round locking cylinders which are connected to one another by a pin connection and have offset end parts, the locking noses of which can be used independently of one another for displacing a lock bolt.DE 36 17 217 C2 discloses a safety lock which has two lock cylinders, the cores of which can each engage with a driver, which has a locking nose, via coupling members.An embodiment which differs from the above-mentioned lock cylinders, although also known from the prior art, are lock cylinders which have on their rear side a driver plate which projects axially in their longitudinal direction and which is aligned with a key receptacle on their front side. This is the case, for example, with known Scandinavian oval closing cylinders. Often, a corresponding locking device has an outer and an inner locking cylinder in order to enable actuation of the locking device from the outside as well as from the inside of the window or door. In this case, the outer and the inner lock cylinder are generally connected to one another via screws, wherein the screw heads often rest on the front side of the inner lock cylinder and the threads of the screws are screwed into the rear side of the outer lock cylinder.The respective driver plates of the lock cylinder are opposite each other, wherein the locking device must have a mechanism with the aid of which a locking process can be carried out by rotating one of the driver plates.It is known from the prior art that this mechanism can be ensured by means of a one-piece crank with an hourglass-shaped recess, in which both driver plates engage. The switching crank in turn has a locking nose for the direct or indirect displacement of the lock bolt. In a common embodiment, the lock bolt is arranged below the switching crank.By engaging both driver plates in the recess of the switching crank, it is possible to trigger a closing process by rotating a driver plate by 90°, while the switching crank moves around the second, fixed driver plate within the scope of an idle stroke. Due to the special shape of the recess, the movement of the switching crank and thus the movement of the rotated driver plate after a rotation angle of 90° is limited by a stop on the opposite stationary driver plate.In order to subsequently remove the key from the key receptacle again, it is necessary to bring the key receptacle and thus also the rotated driver plate back into a neutral position by a reverse rotation of the key. The rotated driver plate thereby runs through the idle stroke of the switching crank.If the lock bolt is already in a desired position in the in shortness of a user, only the relevant driver plate is moved during the idle stroke of the switching crank until it strikes the same after a rotation angle of 90°.As a result, a user can be sure after a key rotation that the lock bolt is in the position corresponding to the direction of rotation, but he cannot derive from the key movement alone whether he has actually triggered a locking operation or whether the lock bolt was already in the desired position.Furthermore, the arrangement of the lock bolt below the switching crank during the locking and unlocking of a locking device of this type results in a rotational sense of the key which may appear in contradiction to users who are accustomed to other common locking devices. In extreme cases, this can lead to a user who is not familiar with the locking device and who does not obtain or obtain any further information about the lock bolt position being innoicially left the locking device in its unlocked position after a desired locking process. (For clarity see also FIG. 4 )Object of the InventionIt is therefore an object of the invention to provide a method and a device in which an intuitive displacement of a lock bolt can be achieved using an outer lock cylinder with driver plates and an inner lock cylinder with driver plates.DESCRIPTION OF THE INVENTIONThis object is achieved according to the invention by a closing device according to claim 1 and a method according to claim 15.The object according to the invention is thus achieved by a locking device in which an outer locking cylinder with driver plates and an inner locking cylinder with driver plates cooperate with an at least two-part crank for displacing a lock bolt. A first crank element is arranged in a rotationally fixed manner on the driver plate of the outer lock cylinder and a second crank element is arranged in a rotationally fixed manner on the driver plate of the inner lock cylinder, wherein the crank elements are arranged together with the lock bolt in a lock case. After a key has been inserted into a key receptacle of the respective lock cylinder in its neutral position, the respective driver plate together with the corresponding crank element can be rotated for displacing the lock bolt. The crank elements are rotatable independently of each other. In its end positions, the lock bolt assumes a release position or a blocking position.The terms "upper", "lower", "inner", "outer" and the like refer to the assembled state of the closing device.The locking cylinders are preferably Scandinavian oval locking cylinders which, according to their known construction, each have a driver plate on their rear side.Preferably, the driver plates are cuboidal in design and are arranged with as little play as possible in a form-fitting manner in a slot-shaped cutout of the crank element assigned to them.The crank elements preferably each have a locking nose, wherein these locking noses can be used independently of one another for displacing the lock bolt. A locking process is only possible if the position of the lock bolt matches the attached direction of rotation of the key and the lock bolt is not otherwise blocked. If this is not the case, the respective locking nose strikes the fixed lock bolt and thus the rotation of the key is blocked.For the purpose of displacing the lock bolt, the respective locking nose preferably engages in a trapezoidal or parabolic recess of the lock bolt during its circular path carried out during the key rotation. The shape of the recess ensures that the locking nose can displace the lock bolt and can subsequently also extend out of the recess again in order to return to its neutral position.A preferred arrangement of the lock bolt above the crank elements results in a direction of rotation during locking and unlocking of the locking device, which direction corresponds to the direction of rotation of a classic profile lock cylinder.The lock bolt can be secured in its release position and in its blocking position in order to prevent unintentional displacement and to increase the safety against a break-in. This securing means can preferably be produced via a latching connection, wherein a spring-loaded pin is arranged on the lock bolt, which pin can latch into a release or blocking recess on the lock case. In particular, the latching connection can be designed such that it is possible to overcome the safety resistance for displacing the lock bolt during the rotation of the key. It is also possible to arrange the pin on the lock case and the release and blocking trough on the lock bolt.The crank elements are preferably arranged on one another with the crank shaped. In this case, the crank elements are rotatable independently of one another. In this case, a low-wear and low-maintenance slide bearing is preferably used.Insertion and removal of the key is generally only possible when the respective lock cylinder or its key receptacle is in the neutral position. For this purpose, a corresponding locking device can be included in the mechanics of the lock cylinder. Due to the rotationally fixed connection of the respective key receptacle to the respective driver plate and the driver plates to the crank elements, their respective neutral positions are determined. Therefore, each of the components mentioned has exactly one defined neutral position over the range of a full circle. If, therefore, the key is to be inserted with subsequent displacement of the lock bolt and a subsequent removal of the key, the key must be rotated 360° in the key receptacle.If the key is additionally rotated even further, after a further rotation of approximately 50°, the locking nose can strike the lock bolt and thus block the rotational movement. This occurs analogously in the event of an initial overturn of the key. (The initial over-rotation denotes a desired locking or unlocking, while the lock bolt already has the corresponding position.)It is known that, in particular in the case of locking devices for doors, it is often possible to shift the lock bolt by a partial distance in each case by a repeated rotation of the key in the same direction. With a corresponding configuration of the shape of the recess of the lock bolt, a simple implementation of this functionality is possible. As a result, the possible rotational range of the key is extended by at least one full circle.One possible application of the locking device illustrated here is the blocking or release of a drive rod with the aid of the lock bolt, wherein the drive rod can be used for the direct or indirect locking of a leaf of a window or of a door on a fixed frame.A gear can be used to displace the drive rod. If the lock bolt of the locking device is in its release position, the drive rod can also be brought, with the aid of the transmission, in particular into a position in which the drive rod prevents the lock bolt from being transferred into the blocking position. A user can thus also derive the position of the drive rod directly from a key rotation, since an attempt to lock the rotation after an angle of rotation of approximately 180° leads to a blockage of the rotation. In this case, the locking nose does indeed engage in the recess of the lock bolt, but this in turn cannot be displaced.The object of the invention is also achieved by a method which comprises a locking process of the previously described locking device, wherein a key is inserted into the key receptacle of the outer lock cylinder or of the inner lock cylinder, a transfer of the lock bolt from the blocking position into the release position or vice versa takes place and the key is subsequently removed again from the key receptacle. The key is rotated through 360°, wherein the rotated components of the locking device are in their neutral position at the beginning and at the end of the method.The method according to the invention is preferably carried out with a closing device described here.Further advantages of the invention will become apparent from the description and the drawing. Likewise, the features mentioned above and those set out further below can be used according to the invention individually or together in any desired combinations. The embodiments shown and described are not to be understood as a final enumeration, but rather have exemplary character for describing the invention.Brief Description of the DrawingsThe following are shown: FIG. 1 is an isometric view of a locking device arranged on a fitting, which has a lock case and lock cylinder, here in the form of a Scandinavian oval lock cylinder, wherein a key is inserted into one of the lock cylinders; FIG. 2 shows an exploded view of the lock case with a view to a lock bolt, a two-part crank and a two-part spring element; FIG. 3 is an isometric, partially cut-away view of the lock cylinder, the key and the two-part crank in the assembled state; FIG. 4 is an isometric view of a portion of a locking device known from the prior art, which has Scandinavian oval locking cylinders and a one-piece crank; FIG. 5 is an isometric sectional view of the lock case and the components located therein, and of the fitting and a drive rod; FIG. 6 is an isometric, partially cut-away view of a part of the lock case and of the crank and of the lock bolt in its release position, wherein the drive rod has a position which permits the lock bolt to be moved into its blocking position; FIG. 7 shows a sectional side view of the components shown in FIG. 6 in a temporal profile during the performance of a locking operation, including the overturn of a crank element until it strikes against the lock bolt; FIG. 8 is an isometric view of the locking device from FIG. 1 with the additional representation of a transmission which serves for the displacement of the drive rod, as well as a section of a frame of a window or a door and a section of a wing; FIG. 9 is an isometric, partially cut-away view of the lock case, analogous to FIG. 6, in which the drive rod has a position which prevents the lock bolt from being moved into its blocking position.DETAILED DESCRIPTION OF THE INVENTION AND DRAWINGFIG. 1 shows a locking device 10 which has a lock case 12, an outer locking cylinder 14 and an inner locking cylinder 16. The locking cylinders 14, 16 are shown here in the form of Scandinavian oval locking cylinders.A key 18 is inserted into a key receptacle 20 of the inner locking cylinder 16. The inner locking cylinder 16 is connected to the outer locking cylinder 14 via a first connecting element 22 aand a second connecting element 22 b, wherein the two connecting elements in the exemplary embodiment shown are screws, in particular hexagon socket cylinder head screws, which are guided through the inner locking cylinder 16 and the lock case 12 and are screwed into the rear side of the outer locking cylinder 14.The locking device 10 is arranged on a leaf 80 (see FIG. 8 ) of a window or a door 78 (see FIG. 8 ). For the sake of better clarity, FIG. 1 shows only one fitting 24 of the wing 80 required for arrangement (see FIG. 8 ).FIG. 2 shows an exploded view of the lock case 12, which has a first half shell 26 and a second half shell 28, wherein a lock bolt 30 located in the lock case 12, a first crank element 32 and a second crank element 34 and a two-part spring element 36 are visible. The spring element 36 has a spring 38 and a pin 40 and serves for producing a latching connection with the purpose of securing the lock bolt 30 in a blocking position or a release position. On the first half shell 26, a release depression 72 a(see FIG. 5 ) and a blocking depression 72 b(see FIG. 5 ) are each formed as counterparts to the pin 40. The lock bolt 30 has a receptacle 41 in which the spring 38 and the shank of the pin 40 can be arranged.The first crank element 32 has a first locking nose 42 and the second crank element 34 has a second locking nose 44. The locking noses 42, 44 serve for displacing the lock bolt 30 while overcoming the safety resistance exerted by the spring element 36 within the framework of the locking connection. The locking noses 42, 44 can engage in an in particular parabolic recess 46 in the lock bolt 30 for displacing the lock bolt 30. In the figure, the crank elements 32, 34 are each shown in their neutral position. The closing noses 42, 44 point downwards in the illustrated embodiment.The lock bolt 30 is arranged above the crank elements 32, 34. Furthermore, the crank elements 32, 34 each have a slot-shaped cutout 48, 50, into which a first and a second driver plate 52, 54 (see FIG. 3 ) of the respective lock cylinder 14, 16 (see FIG. 1 ) are inserted for producing a rotationally fixed connection.It can also be seen from the figure that the half shells 26, 28 of the lock case 12 each have two through-recesses 56 a- dfor passing through the connecting elements 22 a, 22 b(see FIG. 1 ) of the lock cylinders 14, 16 (see FIG. 1 ) and each have a through-recess 58 a, 58 bfor establishing the connection between the crank elements 32, 34 and the lock cylinders 14, 16 (see FIG. 1 ).FIG. 3 shows the lock cylinder 14, 16 connected via the connecting elements 22 a, 22 b. The lock case 12 (see FIGS. 1 and 2 ) is hidden here for better clarity. The crank elements 32, 34 are rotatably arranged on one another to form a crank 60. The crank 60 is shown in section in order to illustrate the engagement of the driver plates 52, 54 in the respective crank elements 32, 34 and the arrangement of the crank elements 32, 34 on one another. A circular relative movement of the crank elements 32, 34 with respect to one another is made possible in the present exemplary embodiment via a sliding bearing, while each crank element 32, 34 is connected to its respective cuboid driver plate 52, 54 in a rotationally fixed manner via a positive connection.The key 18 is inserted into the key receptacle 20 of the inner lock cylinder 16, analogous to the illustration in FIG. 1. When the key 18 rotates, its key receptacle 20 rotates together with the second driver plate 54 and the second crank element 34. The first driver plate 52 and the first crank element 32 do not change their position upon a rotation of the key 18 in the illustrated configuration, since no key is inserted in a key receptacle (not visible here) of the outer lock cylinder 14. When the key 18 is turned, it is fixed in the key receptacle 20 via a locking device 61. This ensures that the key 18 can be removed and inserted only in the neutral position of the locking cylinder 16.FIG. 4 shows a part of a closing device 62, which is known from the prior art. The inner locking cylinder 16 (see FIGS. 1 and 3 ) is hidden here for better clarity. The first driver plate 52 of the outer lock cylinder 14 and the second driver plate 54 (see FIG. 3 ) of the inner lock cylinder 16 (see FIGS. 1 and 3 ) engage in this case in an hourglass-shaped cutout 64 of a one-piece switching crank 66. The driver plates 52, 54 are not connected to the crank 66 in a rotationally fixed manner here, but rather, depending on the selected rotational direction, can execute a free rotation of up to 90° in an idle stroke of the hourglass-shaped recess 64, without causing a movement of the crank 66. A lock bolt 68, which is similar in shape and function to the lock bolt 30 associated with the invention, is arranged below the switching crank 66. This lock bolt 68 is displaceable via a locking nose 70 of the switching crank 66.In the illustrated state, the lock bolt 68 is in the release position. By a rotation of the driver plate 52 through 90° (counterclockwise in the view shown), the lock bolt 68 can be transferred into the blocking position. A rotation of the driver plate 52 and the switching crank 66 beyond 90° is prevented by the opposite driver plate 54 (see FIG. 3 ) provided that no key 18 (see FIGS. 1 and 3 ) is inserted in the inner locking cylinder 16 (see FIGS. 1 and 3 ).To withdraw the key 18 (see FIGS. 1 and 3 ), it is necessary, due to the locking device 61, to bring the driver plate 52 back into its neutral position by a reverse rotation of 90°. During this reverse rotation of the driver plate 52 during the idle stroke of the crank 66 (clockwise in the view shown), it can traverse an angular range of 90°, the crank thereby remaining in the position which corresponds to the blocking position of the lock bolt. In this case, the lock bolt 68 is therefore not displaced, and the key can be removed.A user who has no information beforehand about the current state of the locking device 62 therefore generally does not know whether he is carrying out a locking operation or an idle stroke upon a rotation of the key 18 (see FIGS. 1 and 3 ) if the lock bolt 68 is already in the desired position. In both cases, the key can be rotated through 90°.It can also be seen from FIG. 4 that, due to the arrangement of the lock bolt 68 below the switching crank 66, the direction of rotation of the key rotation for displacing the lock bolt 68 is exactly opposite to the direction of rotation of the key rotation within the scope of a partial aspect of the invention.FIG. 5 shows a sectional view of the lockbox 12 and of the lockbolt 30 and the spring element 36 located therein. The lock bolt 30 is in the release position, which is secured in the first half shell 26 by the latching connection of the pin 40 to the release depression 72 a. The blocking depression 72 bis in this case left free. The fitting 24 and a drive rod 74, which in particular runs through the lock case 12 and into which the lock bolt 30 engages as soon as it is displaced into the blocking position, are likewise shown in section.FIG. 6 shows the second half shell 28 arranged on the fitting 24. The first crank element 32 and the second crank element 34 and the lock bolt 30 are arranged in the second half shell 28, wherein the crank elements 32, 34 are in their neutral position and the lock bolt 30 is in the release position. The drive rod 74 is in a position which allows the lock bolt 30 to be moved into its blocking position.FIG. 7 shows the components of FIG. 6, illustrating the change in positions of the first crank member 32 and the lock bolt 30 over the course of a locking operation at discrete intervals.FIG. a) is considered an initial state in which the lock bolt 30 is in the release position and the first crank element 32 is in its neutral position. In this state, in the present example of application, the key 18 (see FIGS. 1 and 3 ) is inserted into the outer locking cylinder 14 (see FIGS. 1, 3 and 4 ) and a rotational movement is initiated for displacing the lock bolt 30 into its blocking position. The second crank element 34 (see FIGS. 2, 3 and 6 ) remains in its neutral position.FIGS. b) and c) illustrate the engagement of the first locking nose 42 of the first crank element 32 in the recess 46 of the lock bolt 30 and the displacement of the lock bolt 30 into its blocking position.FIGS. d) and e) illustrate the extension of the first locking nose 42 out of the recess 46 of the lock bolt 30 and the return to the neutral position after completion of a full circle movement.In the state shown in FIG. e), the key 18 (see FIGS. 1 and 3 ) could be subtracted. In the example of application shown, however, the first crank element 32 is overturned by approximately 50° until the first locking nose 42 strikes the lock bolt 30. This is evident from Figure f). By striking it in this position, a user is signalled that an end position has been reached and that a closing process has been carried out during the actuation.It can also be derived from FIG. 7 that, in a case in which the user, starting from the state shown in FIG. a), would have initiated a turning operation counter to the direction of rotation shown here, the first locking nose 42 would already come to strike the lock bolt 30 after a rotation of about 50°. Thus, even during the initial overturn, the user is available unambiguous information regarding the position of the lock bolt and in particular regarding whether a locking process has taken place during the turning.FIG. 8 shows the closing device 10, as is also shown in FIG. 1. In addition, a gear 76 arranged on the same fitting 24 is shown. The gear 76 serves for displacing the drive rod 74 (see FIGS. 5 and 6 ). The sliding of the drive rod 74 (see FIGS. 5 and 6 ) may cause a release or blocking of a relative movement of a leaf of the window or door 78 with respect to the frame 82. The window or door 78, which includes the frame 82 and the sash 80, are each shown in the form of a cut-out for the sake of clarity.FIG. 9 shows, analogously to FIG. 6, a view of the second half shell 28, which is arranged on the fitting 24, together with the lock bolt 30 arranged in the half shell 28 and the crank elements 32, 34. In this case, the user can rotate the crank elements 32, 34 by only about 180° in the event of a desired locking operation before a blockage of the crank elements 32, 34 occurs. Thus, when the closing device 10 (see FIG. 1 ) is actuated, the user is also provided with unambiguous information regarding the position of the drive rod 74. Conversely, this means that if the lock bolt 30 is in its blocking position, the transmission 76 (see FIG. 8 ) cannot be operated to its full extent.With a view of all the figures of the drawing taken together, the invention relates in summary to a locking device 10 for displacing a lock bolt 30, which has an outer locking cylinder 14, in particular an outer Scandinavian oval locking cylinder 14, and an inner locking cylinder 16, in particular an inner Scandinavian oval locking cylinder 16. Furthermore, the locking device 10 has a lock case 12, the lock bolt 30 and an at least two-part crank 60. The crank 60 has a first and a second crank element 32, 34, which can be used independently of one another for displacing the lock bolt 30 from a release position into a blocking position and vice versa. The first crank element 32 is arranged in a rotationally fixed manner on a first driver plate 52 of the outer lock cylinder 14, while the second crank element 34 is arranged in a rotationally fixed manner on a second driver plate 54 of the inner lock cylinder 16. To move the lock bolt 30, a key 18 must be inserted into a key receptacle 20 of the respective lock cylinder 14, 16. The invention further relates to a method for carrying out a closing process, in particular the aforementioned closing device 10.List of reference characters10 Locking device 12 lock case 14 outer lock cylinder 16 inner lock cylinder 18 key 20 key receptacle 22 afirst connecting element 22 bsecond connecting element 24 fitting 26 first half shell 28 second half shell 30 lock bolt 32 first crank element 34 second crank element 36 spring element 38 spring 40 pin 41 receptacle 42 first locking nose 44 second locking nose 46 recess (lock bolt) 48 recess (first crank element) 50 recess (second crank element) 52 first driver plate 54 second driver plate 56 a lead-through for connecting element (first half shell) 56 b lead-through for connecting element (first half shell) 56 c lead-through for connecting element (second half shell) 56 d lead-through for connecting element (second half shell) 58 a lead-through for the outer lock cylinder (first half shell) 58 b lead-through for the inner lock cylinder (second half shell) 60 61 Crank 62 Locking device (prior art) 64 Hourglass-shaped recess 66 Crank 68 Lock bolt (prior art) 70 Locking nose (crank) 72a Release recess 72b Blocking recess 74 Drive rod 76 Gear 78 Window / door 80 Leaf 82 FrameReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 44 22 094 A1

[0004] DE 27 52 089 A1

[0005] DE 195 18 491 A1

[0006] EP 3 929 380 A1

[0007] DE 1 024 842 A

[0008] DE 36 17 217 C2

[0009]

Claims

Locking device (10) for displacing a lock bolt (30), comprising: • an outer lock cylinder (14) which has on its rear side a first driver plate (52) which protrudes axially in its longitudinal direction and which is aligned with a first key receptacle (20) on the front side of the outer lock cylinder (14); and • an inner lock cylinder (16) which has on its rear side a second driver plate (54) which protrudes axially in its longitudinal direction and which is aligned with a second key receptacle on the front side of the inner lock cylinder (16); wherein in each case a key (18) can be inserted into the lock cylinder (14, 16) in a neutral position of the lock cylinder (14, 16); • a lock case (12) in which the lock bolt (30) is arranged such that it can be displaced from a blocking position into a release position or vice versa by rotating one of the keys (18), characterized in that an at least two-part crank (60) is arranged in the lock case (12), wherein a first crank element (32) and a second crank element (34) can be used independently of one another for displacing the lock bolt (30), and wherein the first crank element (32) is connected to the first driver plate (52) of the outer lock cylinder (14) and the second crank element (34) is connected to the second driver plate (54) of the inner lock cylinder (16) in a rotationally fixed manner.Locking device (10) according to claim 1, in which the driver plates (52, 54) are of cuboidal design, wherein the first driver plate (52) is arranged without play in a slot-shaped cutout (48) of the first crank element (32), and the second driver plate (54) is arranged without play in a slot-shaped cutout (50) of the second crank element (34).Locking device (10) according to one of the preceding claims, in which the first crank element (32) has a first locking nose (42) and / or the second crank element (34) has a second locking nose (44), wherein the locking nose(s) (42, 44) serve for displacing the lock bolt (30).Locking device (10) according to claim 3, wherein the first locking nose (42) and / or the second locking nose (44) is / are configured to strike the lock bolt (30).Locking device (10) according to claim 3 or 4, in which the lock bolt (30) has a parabolic or trapezoidal cutout (46), in which the locking nose(s) (42, 44) engage in the course of their trajectory upon a rotation of the driver plate(s) (52, 54) in order to displace the lock bolt (30) and subsequently to extend it out of the cutout (46) again.Locking device (10) according to one of the preceding claims, in which the lock bolt (30) is arranged above the crank (60).Locking device (10) according to one of the preceding claims, in which a latching connection between the lock bolt (30) and the lock case (12) via a spring element (36) serves for securing the lock bolt (30) in its blocking position and / or release position.Locking device (10) according to one of the preceding claims, in which the crank elements (32, 34) are arranged rotatably on one another and the movability of the crank elements (32, 34) relative to one another is ensured via a sliding bearing.Locking device (10) according to one of the preceding claims, in which at least one of the lock cylinders (14, 16) has a locking device (61), which permits the key (18) to be inserted into and removed from the respective key receptacle (20) only when the respective lock cylinder (14, 16) is in the neutral position.Locking device (10) according to claim 9, in which, in the event that the locking cylinder (14, 16) is in the neutral position, the driver plate (52, 54) thereof can be rotated 360° after the key (18) has been inserted together with the key (18) until the neutral position is reached again, wherein during this rotation process the lock bolt (30) is transferred from the release position into the blocking position or vice versa.Locking device (10) according to one of the preceding claims, in which an over-rotation of the respective crank element (32, 34) out of its neutral position beyond the corresponding blocking or release position of the lock bolt (30) is possible only over an angular range of a maximum of 60°, before the crank element (32, 34) is blocked by striking the lock bolt (30).Locking device (10) according to one of the preceding claims, wherein the locking device (10) has a drive rod (74), and wherein the lock bolt (30) can be used for blocking or releasing the drive rod (74).Window or door (78) with a fixed frame (82) and a leaf (80) movable relative to the fixed frame (82) and a closing device (10) according to one of the preceding claims, wherein the closing device (10) is designed for the indirect or direct locking of the leaf (80) to the fixed frame (82).The window or door (78) of claim 13 including a gear (76) for moving the drive rod (74).Method for actuating a locking device (10), comprising: • inserting a key (18) into a key receptacle (20) of a lock cylinder (14, 16) which has driver plates (52, 54) while the lock cylinder (14, 16) is in its neutral position, • rotating the key (18) through 360°, wherein a displacement of a lock bolt (30) from a release position into a blocking position or vice versa takes place, and • subsequently extracting the key (18), wherein the lock cylinder (14, 16) is again in its neutral position.

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