LOCKING DEVICE WITH A CRANK, WHICH IS CONTROLLED BY LOCKING CYLINDERS WITH CARRYING PLATES

Description

Background of the invention

[0001] The invention relates to a locking device in which an outer locking cylinder with a drive plate and an inner locking cylinder with a drive plate can be used independently of one another, by means of a suitable key, to move a locking bolt from a release position to a blocking position and vice versa. The invention further relates to a method for actuating a locking device.

[0002] Locking devices for windows and / or doors can have various mechanisms, which rely on different types of locking cylinders. Locking cylinders are often classified according to their external shape. In this way, one can distinguish between profile cylinders, round cylinders, and oval cylinders. Each locking cylinder class can, in turn, be available in different designs, which may overlap in function and handling with the designs of other classes. Depending on the design, different advantages can arise, for example, regarding burglary resistance, ease of installation, handling, robustness, or emergency and danger functions.

[0003] In particular, locking cylinders with an integrated locking cam, which directly or indirectly transmits key movement to the bolt, are widely used in modern locking systems. This is often the case, for example, with common profile cylinders.

[0004] In the context of the invention, the locking devices disclosed in the following publications may be listed in particular to illustrate the prior art: DE 44 22 094 A1 discloses a lock for locking and unlocking doors, which has two profile cylinder cores whose locking lugs can be used independently of each other to move a lock bolt. DE 27 52 089 A1 discloses a lock which has a profile cylinder with a first locking lug, wherein in one embodiment of the invention the profile cylinder has a second locking lug which is independent of or can be deactivated from the first locking lug.

[0005] DE 195 18 491 A1 discloses a profile locking cylinder having at least two locking lugs, which are preferably spaced apart axially along the longitudinal axis of the profile locking cylinder. At least one of the at least two locking lugs is preferably divided into two independently operable locking lug halves.

[0006] EP 3 929 380 A1 describes a locking cylinder, preferably designed as a profile locking cylinder, with a locking lug, which has a high robustness against burglary attempts.

[0007] DE 1 024 842 A discloses a lock which has two round locking cylinders connected to each other via a pin connection with offset end parts, the locking lugs of which can be used independently of each other to move a lock bolt.

[0008] DE 36 17 217 C2 discloses a security lock which has two locking cylinders, the cores of which can each enter into operative contact with a driver having a locking lug via coupling elements.

[0009] A different embodiment of the previously mentioned locking cylinders, although known from the prior art, is a locking cylinder which has an axially projecting drive plate on its rear side, which is aligned with a key receptacle on its front side. This is the case, for example, with known Scandinavian oval locking cylinders. Often, such a locking device has an outer and an inner locking cylinder to allow operation from both the outside and the inside of the window or door. The outer and inner locking cylinders are generally connected to each other by screws, with the screw heads often resting on the front of the inner locking cylinder and the threads of the screws being screwed into the rear of the outer locking cylinder.

[0010] The respective drive plates of the locking cylinders are positioned opposite each other, whereby the locking device must have a mechanism by which a locking process can be carried out by turning one of the drive plates.

[0011] It is known from the prior art that this mechanism can be achieved via a one-piece crank handle with an hourglass-shaped recess into which both drive plates engage. The crank handle, in turn, has a locking lug for the direct or indirect displacement of the locking bolt. In a common embodiment, the locking bolt is arranged below the crank handle.

[0012] By engaging both drive plates in the recess of the shift crank, a 90° rotation of one drive plate triggers a closing action, while the shift crank moves around the second, stationary drive plate during a free stroke. Due to the specific shape of the recess, the movement of the shift crank, and thus the movement of the rotated drive plate, is limited after a 90° rotation by a stop against the opposite, stationary drive plate.

[0013] To remove the key from the key holder, it is necessary to return the key holder, and thus the rotated drive plate, to a neutral position by turning the key backwards. The rotated drive plate then completes the free stroke of the shift crank.

[0014] If the lock bolt is already in a desired position due to the user's ignorance, turning the key will only move the relevant drive plate in the free stroke of the shift crank until it hits the crank after a rotation angle of 90°.

[0015] As a result, although a user can be sure that the lock bolt is in the position corresponding to the direction of rotation after turning the key, he cannot deduce from the key movement alone whether he has actually triggered a locking process or whether the lock bolt was already in the desired position.

[0016] Furthermore, by positioning the locking bolt below the crank handle when locking and unlocking such a locking device, a key rotation direction is required that may seem counterintuitive to users accustomed to other common locking devices. In extreme cases, this can lead to a situation where a user unfamiliar with the locking device, and who does not obtain or seek further information about the locking bolt position, unknowingly leaves the locking device in its unlocked position after attempting to lock it. (For further clarification, see also...) Fig. 4 .)

[0017] US Patent 2003 / 159483 A1 concerns a mortise lock with two cylinders. The cylinders engage with mounting blocks in cams. By rotating the cylinders, the cams can be deflected to, for example, operate a bolt.

[0018] In DE 10 2005 000154 A1 a door lock with a locking cylinder is disclosed, wherein the parts of the locking cylinder are connected by a coupling means of an adapter element.

[0019] DE 10 2007 027580 B4 relates to a locking bolt ring for a cylinder lock for actuating a deadbolt of a mortise lock. The locking bolt ring is intended, in particular, to ensure the panic function and / or automatic locking function of the mortise lock. Object of the invention

[0020] It 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 locking cylinder with drive plate and an inner locking cylinder with drive plate. Description of the invention

[0021] This problem is solved according to the invention by a locking device according to claim 1 and a method according to claim 14. The dependent claims describe preferred embodiments.

[0022] The problem according to the invention is thus solved by a locking device in which an outer cylinder with a drive plate and an inner cylinder with a drive plate interact with a crank consisting of at least two parts to move a bolt. A first crank element is fixedly arranged on the drive plate of the outer cylinder, and a second crank element is fixedly arranged on the drive plate of the inner cylinder, with the crank elements being arranged together with the bolt in a lock case. After inserting a key into a key receptacle of the respective cylinder in its neutral position, the respective drive plate, together with the corresponding crank element, can be rotated to move the 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.

[0023] The crank elements are arranged to rotate against each other within the shape of the crank.

[0024] The crank elements can rotate independently of each other. A low-wear and low-maintenance plain bearing is used.

[0025] The terms "top", "bottom", "inside", "outside" and the like refer to the assembled state of the locking device.

[0026] Preferably, the locking cylinders are Scandinavian oval locking cylinders, which, according to their known design, each have a drive plate on their back.

[0027] Preferably, the drive plates are cuboid in shape and arranged in a slot-shaped recess of the associated crank element with as little play as possible.

[0028] The crank elements preferably each have a locking lug, whereby these locking lugs can be used independently of one another to move the lock bolt. A locking operation is only possible if the position of the lock bolt corresponds to the intended direction of rotation of the key and the lock bolt is not otherwise blocked. If this is not the case, the respective locking lug will strike the fixed lock bolt, thus blocking the rotation of the key.

[0029] To move the lock bolt, the respective locking lug engages, preferably during its circular path when the key is turned, in a trapezoidal or parabolic recess in the lock bolt. The shape of the recess ensures that the locking lug can move the lock bolt and then also extend out of the recess to return to its neutral position.

[0030] Due to a preferred arrangement of the locking bolt above the crank elements, a direction of rotation is given when locking and unlocking the locking device that corresponds to the direction of rotation of a classic profile cylinder lock.

[0031] The lock bolt can be secured in both its released and locked positions to prevent unintentional movement and increase security against break-ins. Preferably, this locking mechanism can be achieved via a latching connection, with a spring-loaded pin on the lock bolt that engages in a release or locking recess on the lock case. In particular, the latching connection can be designed such that the locking resistance can be overcome to move the lock bolt while the key is turned. Alternatively, the pin can be located on the lock case and the release and locking recesses on the lock bolt.

[0032] Inserting and removing the key is generally only possible when the relevant lock cylinder, or rather its keyhole, is in the neutral position. For this purpose, a corresponding locking device may be included in the lock cylinder mechanism. The neutral positions of the respective keyhole and the respective drive plate, as well as the drive plates and the crank elements, are determined by their rotationally fixed connection. Therefore, each of these components has a precisely defined neutral position over a full circle. To insert the key, move the bolt, and then remove the key, it must be rotated 360° in the keyhole.

[0033] If the key is turned further, after another rotation of approximately 50° the locking cam may strike the bolt, thus blocking the turning motion. The same thing happens if the key is initially over-turned. (Initial over-turning refers to attempting to lock or unlock the lock while the bolt is already in the corresponding position.)

[0034] It is known that, particularly with door locking mechanisms, it is often possible to advance the bolt by turning the key several times in the same direction. This functionality can be easily implemented by appropriately shaping the bolt's recess. This extends the key's range of motion by at least one full circle.

[0035] One possible application of the locking device shown here is to block or release a drive rod using the lock bolt, whereby the drive rod can be used to directly or indirectly lock a sash of a window or door to a fixed frame.

[0036] A gearbox can be used to move the drive rod. If the locking bolt of the locking device is in its release position, the drive rod can also be moved by means of the gearbox into a position where it prevents the locking bolt from being moved into the locking position. A user can thus also directly deduce the position of the drive rod from a key turn, since an attempt to lock the key results in a blockage after a rotation angle of approximately 180°. While the locking cam engages in the recess of the locking bolt, the bolt itself cannot be moved.

[0037] The object of the invention is also achieved by a method comprising a locking operation of the previously described locking device, wherein a key is inserted into the key receptacle of the outer or inner locking cylinder, the locking bolt is moved from the blocking position to the release position or vice versa, and the key is then withdrawn from the key receptacle. The key is rotated 360°, with the rotated components of the locking device being in their neutral position at the beginning and end of the process. The method according to the invention is carried out with a locking device as described herein.

[0038] Further advantages of the invention will become apparent from the description and the drawing.

[0039] The embodiments shown and described are not to be understood as an exhaustive list, but rather as examples for the description of the invention. Brief description of the drawings

[0040] They show: Fig. 1 is an isometric view of a locking device mounted on a fitting, comprising a lock case and lock cylinders, here in the form of Scandinavian oval cylinders, with a key inserted into one of the lock cylinders; Fig. 2 is an exploded view of the lock case showing a bolt, a two-part crank, and a two-part spring element; Fig. 3 is an isometric, partially cutaway view of the lock cylinders, the key, and the two-part crank in the assembled state; Fig. 4 is an isometric view of part of a locking device known from the prior art, comprising Scandinavian oval cylinders and a one-piece crank; Fig. 5 is an isometric sectional view of the lock case and the components located therein, as well as the fitting and a connecting rod; Fig.6. An isometric, partially cutaway view of part of the lock case, as well as the crank and the bolt in its release position, wherein the drive rod is in a position that allows the bolt to be moved into its locking position; Fig. 7. A cutaway side view of the in . Fig. 6 The components shown are depicted over time during the execution of a locking process, including the over-rotation of a crank element until it strikes the lock bolt; Fig. 8 is an isometric view of the locking device. Fig. 1 with the additional illustration of a gear mechanism used to move the connecting rod, as well as a section of a window or door frame and a section of a sash; Fig. 9 an isometric, partially cutaway view of the lock case, analogous to Fig. 6, in which the drive rod has a position that prevents the lock bolt from being moved into its blocking position. Detailed description of the invention and drawing

[0041] Fig. 1 shows a locking device 10, which a lock case 12, an external lock cylinder 14 and an inner lock cylinder 16 exhibits. The locking cylinders 14, 16 are shown here in the form of Scandinavian oval locking cylinders.

[0042] A key 18 is in a key recording 20 the inner locking cylinder 16 is inserted. The inner locking cylinder 16 is connected to the outer locking cylinder 14 via a first connecting element. 22a and a second connecting element 22bconnected, wherein the two connecting elements in the illustrated embodiment are screws, in particular socket head cap screws, which are guided through the inner lock cylinder 16 and the lock case 12 and screwed into the rear of the outer lock cylinder 14.

[0043] The locking device 10 is on a wing 80 (see Fig. 8 ) of a window or door 78 (see Fig. 8 ) arranged. In Fig. 1 For clarity, only one fitting is needed for the arrangement. 24 of wing 80 (see Fig. 8 ) shown.

[0044] Fig. 2 shows an exploded view of the lock case 12, which contains a first half-shell 26 and a second half-shell 28 exhibits a lock bolt located in the lock case 12 30, a first crank element 32 as well as a second crank element 34and a two-part spring element 36 are visible. The spring element 36 has a spring. 38 and a pin 40 and serves to create a latching connection for the purpose of securing the lock bolt 30 in a blocking or a release position. On the first half-shell 26, there is a release recess on each side as a counterpart to the pin 40. 72a (see Fig. 5 ) and a blocking recess 72b (see Fig. 5 ) formed. The lock bolt 30 has a receptacle. 41 on, in which the spring 38 and the shaft of the pin 40 can be arranged.

[0045] The first crank element 32 has a first closing lug. 42 and the second crank element 34 has a second locking lug 44The locking lugs 42, 44 serve to displace the lock bolt 30 by overcoming the locking resistance exerted by the spring element 36 within the latching connection. The locking lugs 42, 44 can be positioned to displace the lock bolt 30 into a recess, in particular a parabolic one. 46 engage in the lock bolt 30. In the illustration, the crank elements 32, 34 are each shown in their neutral position. In the illustrated embodiment, the locking lugs 42, 44 point downwards.

[0046] The locking bolt 30 is located above the crank elements 32, 34. Furthermore, the crank elements 32, 34 each have a slot-shaped recess. 48, 50 on, into which a first and a second drive plate 52, 54 (see Fig. 3 ) of the respective lock cylinder 14, 16 (see Fig. 1 ) to create a rotationally fixed connection.

[0047] The illustration also shows that the half-shells 26, 28 of the lock case 12 each have two passage recesses. 56a-d for the implementation of the connecting elements 22a, 22b (see Fig. 1 ) the lock cylinders 14, 16 (see Fig. 1 ) and one through-passage opening in each case 58a, 58b for establishing the connection between the crank elements 32, 34 and the locking cylinders 14, 16 (see Fig. 1 exhibit.

[0048] Fig. 3 shows the locking cylinders 14, 16 connected via the connecting elements 22a, 22b. The lock case 12 (see Fig. 1 and 2 The figure is omitted for clarity. The crank elements 32, 34 are arranged to form a crank. 60The crank elements 32, 34 are rotatably arranged relative to one another. The crank 60 is shown in cross-section to illustrate the engagement of the drive plates 52, 54 with the respective crank elements 32, 34 and the arrangement of the crank elements 32, 34 relative to one another. A circular relative movement of the crank elements 32, 34 is enabled by a sliding bearing, while each crank element 32, 34 is rotationally fixed to its respective cuboid drive plate 52, 54 by a positive-locking connection.

[0049] Key 18 is analogous to the representation in Fig. 1The key 18 is inserted into the key receptacle 20 of the inner lock cylinder 16. When the key 18 is turned, its key receptacle 20 rotates along with the second drive plate 54 and the second crank element 34. The first drive plate 52 and the first crank element 32 do not change their position when the key 18 is turned in the configuration shown, because no key is inserted in the (not visible here) key receptacle of the outer lock cylinder 14. When the key 18 is turned, it is engaged by a locking device. 61 fixed in the key receptacle 20. This ensures that the key 18 can only be removed or inserted when the lock cylinder 16 is in the neutral position.

[0050] Fig. 4 shows part of a locking device 62, which is known from the prior art. The inner locking cylinder 16 (see Fig. 1 and 3) is hidden for clarity. The first drive plate 52 of the outer locking cylinder 14 and the second drive plate 54 (see Fig. 3 ) of the inner lock cylinder 16 (see Fig. 1 and 3 In this case, they engage in an hourglass-shaped recess. 64 a one-piece shift crank 66 The drive plates 52, 54 are not rotationally fixed to the shift crank 66, but, depending on the selected direction of rotation, can perform a free rotation of up to 90° in a free stroke of the hourglass-shaped recess 64 without causing any movement of the shift crank 66. A locking bolt 68, The locking bolt 68, which is similar in form and function to the lock bolt 30 belonging to the invention, is arranged below the shift crank 66. This locking bolt 68 is secured by a locking lug. 70 The shift crank 66 is movable.

[0051] In the illustrated state, the lock bolt 68 is in the release position. By rotating the drive plate 52 by 90° (counterclockwise in the illustrated view), the lock bolt 68 can be moved into the locking position. A rotation of the drive plate 52 and the crank handle 66 beyond 90° is only possible if the inner locking cylinder 16 (see Fig. 1 and 3 ) no key 18 (see Fig. 1 and 3 ) is inserted, from the opposite drive plate 54 (see Fig. 3 ) prevented.

[0052] To remove key 18 (see Fig. 1 and 3Due to the locking device 61, it is necessary to return the drive plate 52 to its neutral position by rotating it back 90°. During this rotation of the drive plate 52 in the free stroke of the shift crank 66 (clockwise in the illustrated view), it can traverse an angle of 90°, while the shift crank remains in the position corresponding to the locking position of the lock bolt. In this case, the lock bolt 68 is not moved, and the key can be removed.

[0053] A user who has no prior information about the current state of the locking device 62 therefore usually does not know whether turning the key 18 (see Fig. 1 and 3 ) performs a locking operation or a free stroke if the locking bolt 68 is already in the desired position. In both cases, the key can be turned 90°.

[0054] Out of Fig. 4 It is further evident that, by arranging the lock bolt 68 below the shift crank 66, the direction of rotation of the key for moving the lock bolt 68 is exactly opposite to the direction of rotation of the key within the framework of a partial aspect of the invention.

[0055] Fig. 5 Figure 1 shows a sectional view of the lock case 12, the bolt 30, and the spring element 36 located within it. The recess 46 in the bolt 30 indicates that the lock case 12 is shown from below. The bolt 30 is in the release position, which is secured by the detent connection of the pin 40 with the release recess 72a in the first half-shell 26. The blocking recess 72b remains unused in this case. Also shown in sectional view are 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 moved into the blocking position.

[0056] Fig. 6 The second half-shell 28 is shown arranged on the fitting 24. The first crank element 32 and the second crank element 34, as well as the locking bolt 30, are arranged in the second half-shell 28, with the crank elements 32 and 34 in their neutral position and the locking bolt 30 in the release position. The drive rod 74 is in a position that allows the locking bolt 30 to be moved into its locking position.

[0057] Fig. 7 shows the components from Fig. 6 , wherein the change in the positions of the first crank element 32 and the lock bolt 30 is depicted over the course of a locking process in discrete intervals.

[0058] Figure a) is considered the 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, the key 18 is used in the present application example (see Fig. 1 and 3 ) into the outer lock cylinder 14 (see Fig. 1 , 3 and 4 ) inserted and a rotary movement initiated to move the lock bolt 30 into its blocking position. The second crank element 34 (see Fig. 2 , 3 and 6 ) remains in its neutral position.

[0059] Figures b) and c) illustrate the engagement of the first locking lug 42 of the first crank element 32 in the recess 46 of the lock bolt 30 and the movement of the lock bolt 30 into its blocking position.

[0060] Figures d) and e) show the extension of the first locking lug 42 from the recess 46 of the lock bolt 30 and the return to the neutral position after completion of a full circular movement.

[0061] In the state shown in Figure e), the key 18 (see Fig. 1 and 3 ) are withdrawn. In the illustrated application example, however, the first crank element 32 is rotated by approximately 50° until the first locking lug 42 abuts the lock bolt 30. This can be seen in Figure f). The impact in this position signals to the user that an end position has been reached and that a locking process has been carried out during operation.

[0062] Out of Fig. 7It can further be deduced that in a case where the user, starting from the state shown in Figure a), had initiated a rotation process contrary to the direction of rotation shown here, the first locking lug 42 would have struck the lock bolt 30 after a rotation of approximately 50°. Thus, even in the case of initial over-rotation, the user has clear information about the position of the lock bolt and, in particular, whether a locking process occurred during the rotation.

[0063] Fig. 8 The locking device 10 is shown, as it is also used in Fig. 1 is shown. Additionally, a gearbox is arranged on the same fitting 24. 76 The gear 76 is used to move the connecting rod 74 (see diagram). Fig. 5 and 6 ). By moving the connecting rod 74 (see Fig. 5 and 6) can cause the relative movement of a sash of the window or door 78 to be released or blocked from the frame 82. The window or door 78, which the frame 82 and the wing 80, are each shown in the form of a section for the purpose of better clarity.

[0064] Fig. 9 shows, in analogy to Fig. 6 , a view of the second half-shell 28, which is arranged on the fitting 24, together with the locking bolt 30 arranged in the half-shell 28 and the crank elements 32, 34. In contrast to Fig. 6In this case, the drive rod 74 is in a position that prevents the locking bolt 30 from moving into its blocking position. The user can only rotate the crank elements 32, 34 by approximately 180° during a locking operation before they become jammed. Thus, when operating the locking device 10 (see Fig. 1 ) also provides clear information on the position of the connecting rod 74. Conversely, this means that if the locking bolt 30 is in its blocking position, the gearbox 76 (see Fig. 8 ) cannot be fully utilized.

[0065] In summary, the invention relates to a locking device 10 for moving 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 a crank 60 consisting of at least two parts. The crank 60 has a first and a second crank element 32, 34, which can be used independently of each other to move the lock bolt 30 from a release position to a locking position and vice versa.The first crank element 32 is arranged in a rotationally fixed manner on a first drive plate 52 of the outer locking cylinder 14, while the second crank element 34 is arranged in a rotationally fixed manner on a second drive plate 54 of the inner locking cylinder 16. To move the locking 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. Reference symbol list

[0066] 10 Locking device 12 Lock case 14 Outer lock cylinder 16 Inner lock cylinder 18 Key 20 Key receptacle 22a First connecting element 22b Second 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 lug 44 Second locking lug 46 Recess (lock bolt) 48 Recess (first crank element) 50 Recess (second crank element) 52 First drive plate 54 Second drive plate 56a Feedthrough for connecting element (first half-shell) 56b Feedthrough for connecting element (first half-shell) 56c Feedthrough for connecting element (second half-shell) 56d Feedthrough for connecting element (second half-shell) 58a Opening for the outer locking cylinder (first half-shell) 58b Opening for the inner locking cylinder (second half-shell) 60 Crank 61 Locking device 62 Locking device (state of the art) 64 Hourglass-shaped recess66 Crank handle 68 Lock bolt (state of the art) 70 Locking lug (crank handle) 72a Release recess 72b Blocking recess 74 Drive rod 76 Gearbox 78 Window / door 80 Sash 82 Frame

Claims

1. Locking device (10) for moving a lock bolt (30), comprising: • an outer locking cylinder (14) which has, on its rear side, a first drive plate (52) that projects axially in its longitudinal direction and is aligned with a first key receptacle (20) on the front of the outer locking cylinder (14); and • an inner locking cylinder (16) which has, on its rear side, a second drive plate (54) that projects axially in its longitudinal direction and is aligned with a second key receptacle on the front of the inner locking cylinder (16); with a key (18) being insertable into each of the locking cylinders (14, 16) in a neutral position of the locking cylinders (14, 16); and • a lock case (12) in which the lock bolt (30) is arranged to be movable from a blocking position into a release position or vice versa by rotating one of the keys (18), with a crank (60) comprising at least two parts being arranged in the lock case (12), it being possible for a first crank element (32) and a second crank element (34) to be used independently of one another to move the lock bolt (30), and the first crank element (32) being connected to the first drive plate (52) of the outer locking cylinder (14) and the second crank element (34) being connected to the second drive plate (54) of the inner locking cylinder (16) for conjoint rotation, characterized in that the crank elements (32, 34) are arranged rotatably with respect to one another and the mobility of the crank elements (32, 34) relative to one another is ensured by a sliding bearing.

2. Locking device (10) according to claim 1, wherein the drive plates (52, 54) are cuboid, wherein the first drive plate (52) is arranged without play in a slot-shaped recess (48) of the first crank element (32) and the second drive plate (54) is arranged without play in a slot-shaped recess (50) of the second crank element (34).

3. Locking device (10) according to either of the preceding claims, wherein the first crank element (32) has a first locking lug (42) and / or the second crank element (34) has a second locking lug (44), wherein the locking lug(s) (42, 44) is / are used to move the lock bolt (30).

4. Locking device (10) according to claim 3, wherein the first locking lug (42) and / or the second locking lug (44) is / are designed to strike the lock bolt (30).

5. Locking device (10) according to claim 3 or 4, wherein the lock bolt (30) has a parabolic or trapezoidal recess (46) in which the locking lug(s) (42, 44) engage(s) in the course of their trajectory when the drive plate(s) (52, 54) rotate(s) in order to move the lock bolt (30) and subsequently to extend it out of the recess (46) again.

6. Locking device (10) according to any of the preceding claims, wherein the lock bolt (30) is arranged above the crank (60).

7. Locking device (10) according to any of the preceding claims, in which, between the lock bolt (30) and the lock case (12), a latching connection via a spring element (36) is used to secure the lock bolt (30) in its blocking position and / or release position.

8. Locking device (10) according to any of the preceding claims, wherein at least one of the locking cylinders (14, 16) has a blocking device (61) which allows the insertion and removal of the key (18) into / from the relevant key receptacle (20) only when the relevant locking cylinder (14, 16) is in the neutral position.

9. Locking device (10) according to claim 8, wherein, if the locking cylinder (14, 16) is in the neutral position, its drive plate (52, 54) can be rotated by 360° together with the key (18) after the key (18) has been inserted 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.

10. Locking device (10) according to any of the preceding claims, wherein over-rotation of the relevant crank element (32, 34) from its neutral position beyond the corresponding blocking or release position of the lock bolt (30) is only possible over an angle range of a maximum of 60° before the crank element (32, 34) is blocked by striking the lock bolt (30).

11. Locking device (10) according to any of the preceding claims, wherein the locking device (10) has a connecting rod (74), and wherein the lock bolt (30) can be used to block or release the connecting rod (74).

12. Window or door (78), having a fixed frame (82) and a leaf (80) which is movable relative to the fixed frame (82), and a locking device (10) according to any of the preceding claims, wherein the locking device (10) is designed to bolt the leaf (80) to the fixed frame (82) indirectly or directly.

13. Window or door (78) according to claim 12, having a locking device according to claim 11 and having a gear mechanism (76) for moving the connecting rod (74).

14. Method for actuating a locking device (10) according to any of claims 1 to 11, comprising: • inserting a key (18) into a key receptacle (20) of a locking cylinder (14, 16) which has drive plates (52, 54) while the locking cylinder (14, 16) is in its neutral position, • rotating the key (18) by 360°, wherein a lock bolt (30) is moved from a release position to a blocking position or vice versa, and • subsequently removing the key (18), wherein the locking cylinder (14, 16) is again in its neutral position.