Coupling arrangement for electromechanical lock

Abstract

According to a first aspect of the invention, there is provided a coupling arrangement (10) of an electromechanical lock comprising a movable shaft (12), a coupling member (14) connected with the shaft (12) and a joint (16) arranged to interact with the shaft (12) and the coupling member (14) The coupling member (14) is configured to be moved by the shaft (12) between a first and a second position (P1, P2), and wherein the coupling member (14) in the second position (P2) is configured to interact with its counterpart (14_C), and wherein the joint (16) is configured to enable deviation in a parallelism between a central axis of the shaft (12_A1) and a central axis the coupling member (14_A1) at least in the second position (P1). According to a second aspect of the invention, there is provided an electromechanical lock comprising the coupling arrangement (10).

Description

[0001] COUPLING ARRANGEMENT FOR ELECTROMECHANICAL LOCK

[0002] FIELD

[0003] Various embodiments relate to a field of electromechanical locks. BACKGROUND

[0004] Coupling arrangements in a field of electromechanical locks are used for coupling and uncoupling two or more components. There is a plurality of different types of coupling structures available on the market, but still the known structures have some issues. For example, the issues may relate to strength of the structure under stress. For example, some clearances may be required in the coupling arrangement that may cause extra stress for the arrangement and may break the structure. Breaking of the coupling arrangement leads to a malfunction of the electromechanical lock.

[0005] Hence, there is a need for the more sophisticated coupling arrangement for the electromechanical lock.

[0006] BRIEF DESCRIPTION

[0007] The present invention is defined by the subject matter of the independent claim. Embodiments are defined in the dependent claims.

[0008] The embodiments and features, if any, described in this specification that do not fall under the scope of the independent claim are to be interpreted as examples useful for understanding various embodiments of the invention.

[0009] LIST OF DRAWINGS

[0010] Some embodiments will now be described with reference to the accompanying drawings, in which:

[0011] Figures 1, 2A, and 2B illustrate a coupling arrangement according to embodiments of the invention;

[0012] Figures 3A and 3B illustrate the coupling arrangement within a frame according to embodiments of the invention;

[0013] Figure 4 illustrates a cross sectional view of the coupling arrangement according to embodiments of the invention;

[0014] Figure 5 illustrates a coupling member of the coupling arrangement according to an embodiment of the invention;Figures 6 and 7 illustrate a shaft of the coupling arrangement according to embodiments of the invention; and

[0015] Figure 8 illustrates an electromechanical lock with the coupling arrangement according to an embodiment of the invention.

[0016] DESCRIPTION OF EMBODIMENTS

[0017] The following embodiments are only examples. Although the specification may refer to “an” embodiment in several locations, this does not necessarily mean that each such reference is to the same embodiment(s), or that the feature only applies to a single embodiment. Single features of different embodiments may also be combined to provide other embodiments. Furthermore, words "comprising" and "including" should be understood as not limiting the described embodiments to consist of only those features that have been mentioned and such embodiments may contain also features / structures that have not been specifically mentioned.

[0018] Reference numbers, both in the description of the embodiments and in the claims, serve to illustrate the embodiments with reference to the drawings, without limiting them to these examples only.

[0019] The applicant, iLOQ Oy, has invented many improvements for the electromechanical locks, such as those disclosed in various European and US patent applications and patents. A complete discussion of all those details is not repeated here, but the reader is advised to consult those publications. The invention described in this application may be used in traditional mechanical locks as well as in electromechanical locks.

[0020] According to a first aspect of the invention, there is provided a coupling arrangement for an electromechanical lock comprising a movable shaft, a coupling member in connection with the shaft, and a joint arranged to movably couple the shaft with the coupling member. The coupling member is configured to be moved by the shaft between a first and second position, and wherein the coupling member in the second position is configured to interact with its counterpart, and wherein the joint is configured to enable deviation in a parallelism between a central axis of the shaft and a central axis the coupling member such that the coupling member can tilt in relation to the shaft at least in the second position to attenuate stress directed to the shaft.

[0021] In an embodiment, the coupling arrangement forms a movable pin having a first part (coupling member) that interacts with other componentsoutside of the arrangement, and a second part (shaft) that is coupled with the first part by the joint. The joint enables moving of the first part in relation to the second part such that a parallelism of the center axes of the first and second parts can deviate. Furthermore, the joint couples the first and second parts together such that when the second part is moved, the first part moves with it. The movable pin may be applied as a locking pin to prevent moving or as a connection pin to enable transferring of movements between components, for example. In one example, the coupling arrangement may be arranged within a rotating lock cylinder that is inside a lock shell (within a hole), and the coupling arrangement may be used for preventing rotation of the lock cylinder in relation to the lock shell, or used for transferring rotation of the lock cylinder to other components of the lock.

[0022] Referring now to Figure 1 that illustrates the coupling arrangement 10 according to an embodiment. A first end of the coupling member 14_E1 is configured to interact with its counterpart. The counterpart may not be part of the invention, but it is important to describe in this application to understand better functioning of the coupling arrangement. The counterpart 14_C is illustrated in Figure 3B. For example, if the coupling arrangement is used in the lock cylinder for locking, then the first end may enter a hole of the counterpart preventing rotation of the lock cylinder. Then, the coupling member of the arrangement is a component that enables the actual locking, in other words, is in contact with the counterpart, for example. A shape of the coupling member may be rectangular or cylindrical, for example. A second end of the coupling member 14_E2 may be in connection with the shaft 12, meaning that a first end of the shaft 12_E1 may be coupled with the second end of the coupling member 14_E2. A second end of the shaft 12_E2 may be in connection with the means (not illustrated in Figure 1) for moving the shaft. A shape of the shaft may be cylindrical, for example. The coupling member 14 and the shaft 12 may be coupled by the joint 16. Hence, the joint may be arranged between the second end of the coupling member and the first end of the shaft. The joint couples the coupling member and the shaft together movably, in other words, the joint may allow some movements between them. The joint 16 enables deviation in the parallelism between the central axis of the shaft 12_A1 and the central axis the coupling member 14_A1. Hence, the central axis of the coupling member maybe unparallel with the central axis of the shaft. The joint may be a ball joint kind of structure, for example.

[0023] Referring now to Figures 2A and 2B. Figure 2A illustrates a situation in which the central axes of the coupling member and the shaft are parallel, and arealso parallel with a central axis of the coupling arrangement 10_Al. The central axis of the coupling arrangement may be a longitudinal axis of the arrangement as illustrated in Figure 1, for example. Figure 2B illustrates a situation in which the joint has enabled moving of the coupling member and the shaft such that their central axes are unparallel, in other words, there is an angle a (deviation angle) between the central axes. Deviation in the parallelism enables the coupling arrangement to tolerate bigger forces compared to a stiff structure, in other words, to the structure in which the deviation in the parallelism between the center axes is not possible. In use the coupling member faces shear forces that may be remarkable. Furthermore, there must always be some clearances within the lock and coupling arrangement to ensure the proper functioning of the arrangements. This may lead to a situation in which shear force turns (tilts) slightly the coupling member, and this turning is transferred to the shaft as well. For example, in known solutions in which a pin having a stiff structure (without the joint) is used, tilting of a first end, due to shear force, is directly transferred to a second end. Hence, the second end moves when the first end moves, but in an opposite direction. This movement inside the lock may break the pin, or it may break some components inside the lock that may lead to a malfunction. The coupling arrangement according to the invention provides a structure in which the tilting of the coupling member is not transferred to the shaft due to the joint. In other words, the joint enables that the coupling member may be tilted to some certain angle in relation to the shaft. The center axis of the shaft 12_A1 may still stay to be accordant (parallel) with the center axis of the arrangement 10_Al, and the center axis of the coupling member 14_A1 may deviate from these axes. Then the joint forms a discontinuity point for force such that the joint substantially removes force that is directed to the shaft due to tilting of the coupling member. It is also possible that joint may transfer some insignificant force from the coupling member to the shaft, but this force is so low that it is not capable of breaking the shaft or any other component in the lock. The angle a between the centerlines due to the joint may be 2 - 10 degrees, for example. The deviation may occur in any direction of the arrangement. Figure 1 illustrates the deviation angle a and a deviation range DR defining in which directions the deviation (angle) may occur. The deviation range may be 360 degrees around the central axes of the shaft and the coupling arrangement, meaning that the deviation angle may occur in any direction around the central axis of the shaft and / or the arrangement. For example, Figure 2B illustrates the deviation only in one direction but this is not limiting, it is just one example.Referring now to Figures 3A and 3B, the coupling member 14 is configured to be moved by the shaft 12 between the first and second position Pl, P2. Figure 3A illustrates the first position and Figure 3B illustrates the second position. When the coupling arrangement is arranged, for example, within the lock cylinder, in the first position the coupling member is inside the cylinder as illustrated in Figure 3A. In the first position the coupling member may not be in contact with its counterpart, in other words, may not prevent rotation of the cylinder since it may be inside the cylinder. A rotation direction of the lock cylinder is illustrated with Rl. Furthermore, in the first position the coupling member may not be capable of transferring rotation of the lock cylinder to other components due to the missing contact with its counterpart. In the second position, the coupling member extends out of the cylinder as Figure 3B illustrates making it possible to be in contact with its counterpart that may prevent rotation of the lock cylinder or enable transmitting of rotational movement to other components. If the counterpart is a stationary part in the lock assembly, the coupling member prevents the movement, but if the counterpart can rotate like the lock cylinder, the coupling member enables rotation of the counterpart with the cylinder. Figures 3A and 3B are cross sectional views of the lock cylinder with the coupling arrangements. The coupling arrangement may further comprise the means for moving the shaft between the first and second positions. Moving of the shaft is transferred to the coupling member via the joint, in other words, moving of the shaft moves the coupling member. As Figures 3A and 3B illustrate, the movement may take place in a first moving direction MD1 that is parallel with the center axis of the arrangement 10_Al.

[0024] Referring to Figures 2A and 2B, in an embodiment, the central axis of the shaft 12_A1 is configured to be substantially parallel with the central axis of the arrangement 10_Al at least when the shaft moves the coupling member 14 between the first and second position Pl, P2. Hence, the central axis of the shaft stays substantially parallel with the central axis of the arrangement, when it moves between the first and second positions. As presented above, due to the joint, the center axis of the coupling member 14_A1 may be unparallel with the central axis of the shaft as well as the central axis of the arrangement. This may occur when the shear force is addressed to the coupling member that causes tilting of the coupling member as presented above.

[0025] Referring now to Figures 3A and 3B, in an embodiment, the arrangement further comprises a frame 18 having an opening 20, wherein the shaft12, joint 16 and the coupling member 14 are arranged, at least partly, within the opening 20, and wherein a central axis of the opening 20_A1 is congruent with the central axis of the arrangement 10_Al. The frame 18 may be the lock cylinder (core) rotatable in the direction Rl, for example. The lock cylinder may comprise the opening 20 for the coupling arrangement 10. The central axis of the opening 20_A1 maybe parallel to the central axis of the coupling arrangement, meaning that when the shaft with the coupling member moves between the first and second positions, it moves along the center axis of the opening. The lock cylinder may be a cylindrical and the center axis of the opening may extend perpendicularly in relation to a longitudinal central axis of the cylinder (28_A1 in Figure 8). A clearance between the opening of the frame and the coupling member making it possible that the coupling member may tilt when force from rotational movements is addressed to it.

[0026] The lock cylinder (core) may be arranged inside an opening of a shell of a lock assembly (core frame). The opening may be cylindrical, and the lock cylinder can rotate inside the opening around its longitudinal center axis. The longitudinal central axis of the lock cylinder and the opening of the shell may be parallel. An inner surface of the opening of the shell may comprise a cavity for receiving the first end of the coupling member in its second position. The cavity may be the counterpart of the coupling member. The shell may be stationary part in the lock assembly, and when the coupling member is within the cavity, it prevents rotation of the lock cylinder. In other words, the coupling arrangement acts as a locking pin. The lock cylinder may also be a two-part component having a front and back end. The front end may extend partly inside the back end, in other words, the front and back ends overlap at least partly. One end of the back end may comprise an opening for receiving one end of the front end in the overlapped section. The coupling arrangement may be arranged within the overlapped section. The opening in the back end may comprise a cavity within an inner surface for receiving the coupling member in its second position. Then the coupling member (in the second position) couples the front and back end together such that rotation of the first end can be transferred to the back end. In the first position of the coupling member, the rotation is not transferred due to the missing connection between the coupling member and the cavity of the back end. The lock cylinder may comprise two coupling arrangements such that a first is used for preventing the rotational movement, and the second for transferring the rotational movement, for example.Referring to Figure 3B, in an embodiment, the coupling member 14 in the second position P2 extends out of the frame 18 through the opening 20. Then the coupling member can take contact with its counterpart to prevent or transfer movements within the lock assembly. In the first position the coupling member stays substantially inside the opening as illustrated in Figure 3A and is not capable of taking contact with its counterpart.

[0027] Still referring to Figures 3A and 3B, in an embodiment, the joint 16 connects the shaft 12 and the coupling member 14 such that when the shaft 12 is moved between the first and the second position Pl, P2 in the first moving direction MD1, the coupling member 14 moves with the shaft 12. As presented above, it is important to realize that there are always some clearances in the coupling arrangement and therefore moving direction may also slightly deviate from the given directions. Furthermore, the center axis of the coupling member 14_A1 may deviate from the center axis of the opening of the frame 2O_A1 when moved between the first and second positions due to the joint. Hence, the shaft may move substantially along the center axis of the opening of the frame, but the center axis of the coupling member may slightly deviate from the center axis of the opening (and shaft) when moved.

[0028] Referring to Figure 4 and 5, in an embodiment, the coupling member 14 comprises a cavity 22 and a first end of the shaft 12_E1 enters inside the cavity, wherein the cavity 22 and the first end of the shaft 12_E1 forms the joint 16. The cavity may be open at least from one side allowing the first end of the shaft to be inserted into the cavity, and also away from the cavity. In other words, the first end of the shaft 12_E1 may be removably coupled with the cavity 22. The first end may be, at least partly, locked within the cavity such that when the shaft is moved between the first and the second positions, the joint enables moving of the coupling member with the shaft. Hence, the joint keeps the shaft and the coupling member together at least when moved in the first moving direction MD1 (the center axis of the opening / arrangement). For example, the first end of the shaft may comprise a feature that locks inside the cavity such that the shaft cannot move out of the cavity when the arrangement is moved in the first moving direction MD1. Nevertheless, the first end of the shaft may be locked within the cavity, the shaft and the coupling member may still be capable of moving in relation to each other as presented above.

[0029] Referring now to Figure 5, in an embodiment the cavity comprises an inner space 22J and a first narrowing 22_N between the inner space 22J and anexterior. A shape of the cavity may be at least partly round. The shape may also be triangle, square or polygon, for example. As illustrated in Figure 5, the cavity may be arranged within a second end of the coupling member, and the cavity may be a groove in the second end of the coupling member extending from a first side (surface) towards a second side (surface). The cavity may extend through the side surfaces, or at least one of the side surfaces. The cavity may also extend through a bottom surface that forms the groove shape. Hence, the groove is in connection with the exterior at least through the bottom surface and one side surface. In other words, the cavity within the coupling member is open through the bottom surface and at least one side surface. Through the open side, the shaft may be arranged inside the cavity, for example. The narrowing in the cavity may be arranged substantially in the vicinity of the bottom surface or on the bottom surface. Hence, narrowing is between the inner space of the cavity and the exterior. As illustrated in Figure 4, a diameter of the inner space of the cavity DI is larger than a diameter of the narrowing D2. Hence, the narrowing may comprise two flanges extending towards each other and the diameter of the narrowing may refer to the dimension between the flanges. The shape of the inner space may be at least partly round.

[0030] Referring now to Figure 6, in an embodiment, the first end of the shaft 12_E1 comprises an extension 24 and a second narrowing 12_N between the extension and a frame 12_F of the shaft. A diameter of the extension D3 is larger than a diameter of the narrowing D4. The diameter of the narrowing may also be smaller than a diameter of the frame of the shaft. The narrowing and / or the extension may extend around the shaft as illustrated in Figure 6, for example. A shape of the extension may be substantially the same as the shape of the inner space of the cavity to ensure proper fitting inside the cavity. The shape may be round, for example.

[0031] Referring now to Figure 4, in an embodiment, the extension 24 is configured to be arranged within the cavity 22 such that the frame of the shaft 12_F extends out of the cavity. In the assembled state of the coupling member and shaft, the extension may be in the inner space of the cavity and the second narrowing of the shaft is aligned with the first narrowing of the cavity, and then the frame of the shaft may stay out of the cavity of the coupling member.

[0032] Still referring to Figure 4, in an embodiment, the first narrowing 22_N is aligned with the second narrowing 12_N to prevent removal of the extension from the cavity in the first moving direction of the arrangement MD1. Hence, when the extension is within the cavity and the first narrowing of the cavity is aligned with the second narrowing of the shaft, the first narrowing prevents the extensionfrom moving out of the inner space of the cavity through the bottom surface of the coupling member. Hence, the shaft cannot move out of the coupling member when moved in the first moving direction MD1.

[0033] In an embodiment, the coupling arrangement comprises more than one joint. For example, there may be two joints in the arrangement. In an embodiment, the shaft comprises a first and a second extensions arranged such that there is a narrowing between the extensions, and between the first extensions and the frame of the shaft. The extensions with the narrowings may be arranged adjacently, on the top of each other, within the first end of the shaft, for example. The coupling member may comprise a first and a second cavity such that there is a narrowing between the cavities and between the first cavity and the exterior. The first cavity is for receiving the first extension, and the second cavity is for receiving the second extension. Functioning of the two joints formed by the two extensions and cavities with narrowings may be substantially the same as described above with the one extension and cavity. This embodiment is not illustrated in Figures.

[0034] Still referring to Figure 4, the joint 16 comprises a clearance C between the first end of the shaft 12_E1 and the cavity 22 to enable moving of the shaft in relation to the coupling member such that the parallelism between the central axis of the shaft 12_A1 and the coupling member 14_A1 may deviate at least in the second position P2. The clearance may be between the extension of the shaft and the inner space of the cavity in which the extension is arranged, and further between the first narrowing of the cavity and the second narrowing of the shaft. The clearance enables moving of the shaft in relation to the coupling member such that the parallelism between the central axis of the shaft and the coupling member may deviate, in other words, such that center axes of the shaft and coupling member may be unparallel. The clearance means that the diameter of the inner space DI is a little larger than the diameter of the extension D3, and the diameter of the first narrowing D2 in the cavity is a little larger than the diameter of the second narrowing D4 in the shaft. The clearance may be between 0.01 - 0.1mm, for example.

[0035] Referring now to Figure 1 and 4, in an embodiment, a diameter of the shaft D6 is smaller than a diameter of the coupling member D5. As described above, the coupling member is configured to contact its counterpart, such that when it interacts with the counterpart, it prevents the rotational movement or transfers the movement. For example, when it is used for preventing rotational movement, it is subjected to a high shear force. Therefore, the coupling member shall be capable of enduring high stress, and it must be physical large enough. The shear force is notdirectly subjected to the shaft in the arrangement. Especially when the joint is used with the coupling member and the shaft to attenuate stress subjected to the shaft. Therefore, the shaft can be substantially smaller in diameter than the coupling member. In other words, the coupling member is a part of the arrangement that is exposed to the stress in the lock assembly.

[0036] In an embodiment, the arrangement 10 comprises means 26 for moving the shaft 12 between the first and the second position Pl, P2. The means may comprise a first stationary magnet with a coil and a first movable magnet arranged in the shaft, wherein the first coil is configured to change a polarity of the first stationary magnet to move the first movable magnet such that the movement of the first movable magnet is further configured to move the shaft between the first and the second position. The stationary magnet and / or coil may be arranged to be, at least partly, around the movable magnet arranged within the shaft. For example, the stationary magnet may be cylindrical hollow tube and the shaft is, at least partly, arranged within the hollow space of the tube. This requires a relatively small diameter of the shaft that a size of the stationary magnet with the coil can also be small to ensure that all the components can be arranged within the lock. Hence, the shaft can be substantially smaller in diameter than the coupling member.

[0037] The coil is electrically powered magnetization coil configured to switch the polarity of the stationary permanent semi-hard magnets between a first magnetization configuration S-N and a second magnetization configuration N-S. N and S refers to the North pole N and the South pole S of the magnet, and the opposite poles (S-N, N-S) attract each other, whereas similar poles (N-N or S-S) repel each other. The arrangement may comprise the processor circuitry to provide a control signal to the coil to switch the polarity of the stationary magnet. Change of the magnetization configuration causes moving of the movable magnet that moves the shaft, and the shaft moves the coupling member between the different positions.

[0038] In an embodiment, electric energy needed for operating the coils and / or other component in the lock may be harvested by the electromechanical lock using Near Field Communication NFC from a smartphone or other user apparatus, or the current may be generated from a key insertion, both being technologies developed by the applicant. However, other sources of electric energy may be applied as well.

[0039] Moving of the components within the lock by magnets is well known and is not described in detail in this application. The reader is advised to consultapplicant`s patent application EP3825496A1 wherein moving of the pins by the magnets in the electromechanical lock is described in detail.

[0040] Material of the shaft and / or coupling member comprises metal. It may be titanium, for example.

[0041] Referring now to Figure 7, in an embodiment, the joint comprises a first magnet Ml and a second magnet Ml such that opposite poles of the magnets Ml_Pl-2, M2_P1-P2 are coupled together. Tilting of the coupling member may cause magnets to uncouple partly making it possible that central axis of the coupling member may be unparallel with the central axis of the shaft. In other words, uncoupling of magnets may attenuate the stress caused by shear force and aimed at the coupling member such that stress in the shaft is smaller. When the tilting does not exist anymore, magnets are again properly coupled. The term “partly coupled" may mean that the surfaces of the opposite poles of the magnets are coupled from one side but not from the other side (not with entire surface areas), and the term “ properly coupled” may mean that surfaces of the opposite poles are in full contact (with entire surface areas). In a first embodiment, the first magnet may be within the shaft and the second magnet may be within the coupling member. In a second embodiment, the shaft comprises a first and a second part wherein the first magnet is arranged within the first part and the second magnet within the second part.

[0042] According to a second aspect of the invention, there is provided an electromechanical lock arrangement 28 comprising the coupling arrangement 10 comprising any of the features described above.

[0043] Referring now to Figure 8, the electromechanical lock arrangement 28 may comprise a core 32 (lock cylinder, plug) arranged within an opening of a core frame (housing, shell) 30. The core can rotate in relation to the core frame around a central axis of the lock arrangement 28_A1. The core may be coupled with an operation knob 34 such that when a user rotates the knob, the rotational movement is transferred to the core. The core may further comprise the coupling arrangement 10. The coupling arrangement in the second position is in contact with its counterpart, that may be arranged within the inner surface of the opening of the core frame, for preventing rotation of the core when the lock is in a locked state. In the first position the coupling arrangement is not in contact with the counterpart that enables rotation of the core. When the rotation of the core is enabled, the lock may be set to an openable state. As described above, the core may also be the two-part component having the front and back ends, and the coupling arrangement may beused to couple and uncouple the front and back end together. This embodiment is not illustrated in Figures.

[0044] It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can be implemented in various ways. The inven-tion and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

Claims

CLAIMS1. A coupling arrangement (10) for an electromechanical lock comprising:a movable shaft (12);a coupling member (14) in connection with the shaft (12); and a joint (16) arranged to movably couple the shaft (12) with the coupling member (14),wherein the coupling member (14) is configured to be moved by the shaft (12) between a first and a second position (Pl, P2), and wherein the coupling member (14) in the second position (P2) is configured to interact with its counterpart (14_C); andwherein the joint (16) is configured to enable deviation in a parallelism between a central axis of the shaft (12_A1) and a central axis the coupling member (14_A1) such that the coupling member (14_A1) can tilt in relation to the shaft (12_A1) at least in the second position (P 2) to attenuate stress directed to the shaft (12_A1).

2. The arrangement (10) of claim 1, wherein the shaft (12) is configured to move along its central axis (12_A1) when moving the coupling member (14) between the first and the second positions (Pl, P2), wherein the central axis of the shaft (12_A1) is substantially parallel with a central axis of the arrangement (10_A1).

3. The arrangement (10) of claim 2, wherein the arrangement further comprises a frame (18) having an opening (20), wherein the shaft (12) and the coupling member (14) are arranged, at least partly, within the opening (20), and a central axis of the opening (20_A1) is congruent with the central axis of the arrangement (10_A1).

4. The arrangement (10) of claim 3, wherein the coupling member (14) in the second position (P2) extends out of the frame (18) through the opening (20).

5. The arrangement (10) of any preceding claim, wherein the joint (16) connects the shaft (12) and the coupling member (14).

6. The arrangement (10) of any preceding claim, wherein the coupling member (14) comprises a cavity (22) and a first end of the shaft (12_E1) enters inside the cavity, wherein the cavity (22) and the first end of the shaft (12_E1) forms the joint (16).

7. The arrangement (10) of claim 6, wherein the first end of the shaft (12_E1) is removably connected with the cavity (22).

8. The arrangement (10) of claim 6 - 7, wherein the cavity (22) comprises an inner space (22_I) and a first narrowing (22_N) between the inner space (22_I) and an exterior.

9. The arrangement (10) of claim 6 - 8, wherein the first end of the shaft (12_E1) comprises an extension (24) and a second narrowing (12_N) between the extension (24) and a frame (12_F) of the shaft.

10. The arrangement (10) of claim 9, wherein the extension (24) is configured to be arranged inside the cavity (22) such that the frame of the shaft (12_F) extends out of the cavity (22) through the first narrowing (22_N).

11. The arrangement (10) of claim 9, wherein the first narrowing (22_N) is aligned with the second narrowing (12_N) to prevent removal of the extension (24) from the cavity (22) in a first moving direction of the arrangement (MD1).

12. The arrangement (10) of claim 6, wherein the joint (16) comprises a clearance (C) between the first end of the shaft (12_E1) and the cavity (22) to enable moving of the shaft (12) in relation to the coupling member (14) such that the parallelism between the central axis of the shaft (12_A1) and the coupling member (14_A1) may deviate at least in the second position (P2).

13. The arrangement (10) of any preceding claims, wherein a diameter of the shaft (12) is smaller than a diameter of the coupling member (14).

14. The arrangement (10) of any preceding claims, wherein the arrangement (10) further comprises means (26) for moving the shaft between the first and the second position (Pl, P2).

15. An electromechanical lock arrangement (28) comprising the coupling arrangement (10) of any of claims 1 - 14.

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