EP3665346B1 - Coupling system for an electromechanical lock - Google Patents

Description

The invention relates to a clutch system for an electromechanical lock and an electromechanical lock with such a clutch system.

Coupling systems for electromechanical locks are known from the prior art. Such clutch systems are usually controlled electronically and actuate an electromechanical clutch device to release or block a lock. For this purpose, control electronics receive a signal, for example via an RFID card, which is evaluated and, depending on the result of the evaluation, electromechanical coupling means are activated in order to release or block the lock. In particular, systems are known in which the control electronics are arranged in a hand knob and the clutch system can be switched between a blocked state and a released state. In the locked state, the hand knob cannot be turned. In the release state, the hand knob can be turned and actuates a blocking device, for example the latch or the locking lug of a lock. It is provided in particular that the release state can only be activated for a short time, usually only a few seconds, and the clutch system then assumes the blocked state again.

Conventional devices are, inter alia, from EP 2 860 331 A1 , the WO 2011/119097 A1 , the WO 2009/078800 A1 , the WO 2015/140180 A1 and the U.S. 2014/165677 A1 famous.

Such known coupling systems comprise a housing and a core which is rotatably mounted in the housing, as well as a connecting means which produces a mechanical, form-fitting and non-rotatable connection of the core to the housing.

However, the known coupling systems are excessively complicated in structure and also not suitable to be adapted to different applications. It would be desirable to use one and the same electromechanical clutch system both for hybrid cylinders that are electronically actuated on one side and mechanically on the other side, and for cylinders that are electronically actuated on both sides. It would also be advantageous to use the components of the same coupling system for the lever cylinders commonly used in letterboxes or lockers, in which the cylinder core is directly connected to a locking lever and does not engage in a locking lug, and in which actuation takes place only from one side.

This and other objects are achieved according to the invention by a clutch system according to claim 1.

According to the invention, a separate coupling element is provided which can be displaced from a release state into a blocking state essentially along a longitudinal axis of the core. In the blocked state, the connecting means engages both in the core and in the housing in a form-fitting manner, so that the core and housing are mechanically connected. A rotation of the core in the locked state is thus prevented.

In order to move the connecting means into the housing in the blocked state, the coupling element has, on its outer circumference, an engagement surface which essentially widens conically in relation to the longitudinal axis. This engagement surface is in contact with the connecting means, so that when the coupling element is axially displaced, the connecting means is pressed out of the core and into the housing. Thus, only the coupling element has to be displaced along the longitudinal axis of the core in order to bring the coupling system from the blocked state into the released state and back again.

The blocking state usually represents the initial state, so that the clutch element has to be shifted in order to reach the release state. For the essentially axial displacement of the coupling element along the longitudinal axis of the core, it can be provided according to the invention that the coupling element is connected to a motor spindle of a motor via a spring element, preferably via a spiral spring. According to the invention, the coupling element is connected to a motor nut arranged on a motor spindle of a motor via a spring element, preferably via a spiral spring, for essentially axial displacement along the longitudinal axis of the core.

Starting from the blocking state, when the motor spindle rotates, the coupling element is axially displaced against the tension of the spring element and releases the connecting means, which can be pressed into the housing by rotating the core, so that the release state is reached. To get back to the blocking state, the motor spindle is turned in the other direction, so that the coupling element is pushed back axially and the connecting means is pressed back into the housing.

According to the invention it can be provided that the core is connected to a locking device, for example a locking lever, so that the locking device can be actuated by rotating the core in the released state and cannot be actuated in the blocked state. Such an embodiment can be provided in particular for lever cylinders that are only actuated from one side.

According to the invention, it can be provided that the coupling element is designed as a coupling ring which, on its outer circumference, comprises an outwardly protruding shoulder which is guided essentially axially in a core groove of the core. This ensures that the coupling ring can only be moved in the axial direction.

The engagement surface according to the invention can preferably be provided on the outer surface of this shoulder and can interact there with the connecting means according to the invention. In particular, a recess can be provided in the core groove, through which the connecting means can be guided in order to create the form fit of the core with the housing.

According to the invention it can be provided that the connecting means is designed as a ball which can be pressed into a housing groove of the housing through a preferably circular recess of the core to form the blocking state. The recess of the core can be provided in particular in the core groove of the core, so that the shoulder of the coupling ring guided in the core groove is designed to press the ball through the recess of the core into the housing groove. In the blocked state, the ball is partly in the core groove and partly in the body groove, so that a positive connection between the core and the body is achieved.

An advantage according to the invention of realizing the connecting means as a ball is also that in the released state no restoring means are required to move the ball back into the core: the torque exerted on the core when the knob is manually operated is sufficient to push the ball through the to move the edge of the housing groove back into the core.

According to the invention, it can be provided that the coupling element has on its outer circumference, preferably on the outer circumference of the shoulder, a stop surface which widens essentially in the shape of a circular arc relative to the longitudinal axis. In particular, this stop surface can be steeper than the engagement surface and forms a stop for the connecting means, so that the coupling element cannot be moved any further. When using a sphere as the connecting means, it can be provided according to the invention that the radius of the circular arc essentially corresponds to the radius of the sphere.

The engagement surface can merge directly into the abutment surface, but it can also be provided that a spacer surface running essentially equidistant to the longitudinal axis is formed between the engagement surface and the abutment surface. This allows a design-related play in the position of the coupling element in the locked state.

According to the invention it can be provided that several connecting means are provided. In particular, two connecting means can be provided.

The connecting means can be distributed substantially uniformly on the outer circumference of the core. This has the advantage that the torques acting on the core in the blocked state are dissipated evenly to the housing.

According to the invention, it can be provided that several, preferably two, shoulders are provided which are distributed essentially evenly on the outer circumference of the coupling ring and are designed to engage in several, preferably four, core grooves which are distributed essentially evenly on the inner circumference of the core. The result of this is that the core can be guided into the blocked state in a plurality of angular positions, preferably in four angular positions rotated by 90°. The core grooves preferably each have recesses for the passage of the connecting means into corresponding housing grooves in order to be able to produce the form fit in the different angular positions of the core.

According to the invention it can be provided that a separate coupling element is provided for connecting the core to an actuating element, for example a locking lug, which is designed for positive engagement in recesses of the actuating element. This has the advantage that different adapters can be used to actuate different locking lugs, and the core therefore does not have to be manufactured differently for each locking lug.

In order to enable a particularly advantageous cooperation with the coupling element according to the invention, it can be provided according to the invention that the coupling element is resiliently connected to the coupling element and can also be displaced essentially along the longitudinal axis of the core. According to the invention, it can be provided that the coupling element for essentially axial displacement along the longitudinal axis of the core is connected via the above-described spring element, preferably via a spiral spring, to a motor nut arranged non-rotatably on a motor spindle of a motor. In this case, the spring element is resiliently connected both to the coupling element, to the coupling element and to the motor nut.

As a result, the coupling element is connected to the coupling element and, in the blocked state, moves essentially synchronously with the coupling element.

In the released state, however, the coupling element is pressed against the actuating element and remains in this position unless it positively engages in recesses of the actuating element. In this situation, the actuating element is not engaged and can be rotated freely - it is not possible to actuate the locking lug. This situation is referred to as freewheeling. The actuating element can only be actuated when the coupling element is brought into a position by turning the knob in which it positively engages in the actuating element. This situation is referred to as a locked condition.

According to the invention it can be provided that the spring element is designed as a one-piece spiral spring with an outer spiral and an inner spiral, one end of the outer spiral being connected to the coupling element and the inner spiral being connected to the motor nut. If a coupling element is provided, it can be provided that the outer spiral is connected to the coupling element at its other end.

This allows a particularly efficient and modular design of the coupling system according to the invention, since only one additional part, namely the coupling element, is required and the spring element, the coupling element and the connecting means can continue to be used.

According to the invention it can be provided that the coupling element is essentially ring-shaped. The coupling element can have a carrier ring and preferably two engaging jaws which protrude essentially radially and axially outwards.

The engagement jaws can be designed in particular for form-fitting engagement in recesses of the actuating element, for example a locking lug.

According to the invention it can be provided that the coupling element has an internal thread for connection to the spring element. The spring element can be screwed, welded or attached in some other way to the coupling element. According to the invention it can also be provided that the coupling element has an internal thread for connection to the spring element. The spring element can be screwed, welded or attached in some other way to the coupling element.

The invention also extends to a lock, preferably an electromechanical lock, comprising a clutch system according to the invention.

• Fig. 1: eine schematische Explosionsdarstellung einer ersten Ausführungsform eines erfindungsgemäßen Kupplungssystems;
• Fig. 2a: einen Querschnitt durch diese Ausführungsform eines erfindungsgemäßen Kupplungssystems im Blockierzustand;
• Fig. 2b: einen Querschnitt durch diese Ausführungsform eines erfindungsgemäßen Kupplungssystems im Freigabezustand;
• Fig. 2c - 2d: eine schematische Ansicht und einen Querschnitt dieser Ausführungsform des erfindungsgemäßen Kupplungselements;
• Fig. 2e - 2g: schematische Ansichten eines Kerns, eines Federelements sowie eines Gehäuses für diese Ausführungsform des erfindungsgemäßen Kupplungssystems;
• Fig. 3: eine schematische Explosionsdarstellung einer zweiten Ausführungsform eines erfindungsgemäßen Kupplungssystems;
• Fig. 4a: einen Querschnitt durch diese zweite Ausführungsform eines erfindungsgemäßen Kupplungssystems im Blockierzustand;
• Fig. 4b: einen Querschnitt durch diese zweite Ausführungsform eines erfindungsgemäßen Kupplungssystems im Freigabezustand;
• Fig. 4c: einen Querschnitt durch diese zweite Ausführungsform eines erfindungsgemäßen Kupplungssystems im eingerasteten Zustand;
• Fig. 4d - 4f: schematische Ansichten des Koppelelements für diese zweite Ausführungsform des erfindungsgemäßen Kupplungssystems.

The invention is explained in more detail below using non-exclusive exemplary embodiments. Show it:

• 1 : a schematic exploded view of a first embodiment of a clutch system according to the invention;
• Figure 2a : a cross section through this embodiment of a clutch system according to the invention in the blocked state;
• Figure 2b : a cross section through this embodiment of a clutch system according to the invention in the released state;
• Figures 2c - 2d 1: a schematic view and a cross section of this embodiment of the coupling element according to the invention;
• Figures 2e - 2g 1: schematic views of a core, a spring element and a housing for this embodiment of the clutch system according to the invention;
• 3 : a schematic exploded view of a second embodiment of a clutch system according to the invention;
• Figure 4a : a cross section through this second embodiment of a clutch system according to the invention in the blocked state;
• Figure 4b : a cross section through this second embodiment of a clutch system according to the invention in the released state;
• Figure 4c : a cross section through this second embodiment of a clutch system according to the invention in the engaged state;
• Fig. 4d - 4f 1: schematic views of the coupling element for this second embodiment of the coupling system according to the invention.

1 shows a schematic exploded view of a first embodiment of a clutch system according to the invention for an electromechanical lock. A conventional hand knob, which is connected to the core 1, is shown on the left-hand side of this illustration. The core 1 is rotatably mounted in the housing 2. In the idle state, the clutch system is in the blocked state, so that the user cannot rotate the core 1 relative to the housing 2 by turning the hand knob. In the release state, the coupling system releases the core 1 and the user can cause the core 1 to rotate relative to the housing 2 by turning the hand knob. A coupling element in the form of a coupling ring 3 and a spring element in the form of a spiral spring 9 are arranged in the core 1 . Connection means in the form of two balls 4 are used to positively connect the core 1 to the housing 2.

Figure 2a shows a cross section through this embodiment in the blocked state. In this case, the clutch system according to the invention is used for a cam cylinder lock. The blocking state shown in this figure represents the idle state of the lock. The coupling system comprises a housing 2 and a core 1 rotatably mounted therein, which is connected to a hand knob on the left-hand side. The core 1 is connected to a closing lever 24 on the right-hand side. Two balls 4 are provided, which are pressed through a circular recess 17 of the core 1 into housing grooves 16 of the housing 2 . For this purpose, a coupling ring 3 is provided in the core 1, which can be displaced along the longitudinal axis 23 of the core 1. On its outer circumference, the coupling ring 3 has two radially outwardly projecting shoulders 12 which each engage in a core groove 13 of the core 1 for guidance.

In the blocking state shown, the balls 4 are pressed by the stop surface 11 on the outer circumference of the coupling ring 3 through the recess 17 into the housing groove 16 and ensure a positive connection of the core 1 with the housing 2 . A rotation of the core 1 relative to the housing 2 is not possible.

In order to switch the clutch system to the release state, the clutch ring 3 must be shifted to the right. For this purpose, the coupling ring 3 is connected via a spiral spring 9 to a motor nut 8 which is arranged in a rotationally fixed manner on a motor spindle 6 of a motor 7 arranged in the core 1 . Activating the motor 7, for example with an authorized electronic chip card or an authorized RFID chip, causes the motor spindle 6 to rotate. This moves the motor nut 8 to the right along the longitudinal axis 23 and also pulls the spiral spring 9 to the right. The inner circumference of the coupling ring 3 is connected to the spiral spring 9 via an internal thread 25 and is thus also shifted to the right until the release state is reached.

Figure 2b Figure 12 shows a cross-section through this embodiment when the release state is reached. The motor spindle 6 has moved the motor nut 8 to the right by turning it and has taken the spiral spring 9 and the coupling ring 3 with it. The coupling ring releases the balls 4 on its outer surface and these can be moved into the core 1 along the conical engagement surface 5 . By using the balls 4 as the connecting means, it is not necessary to provide a restoring means for the connecting means, because when the core 1 rotates, the balls 4 are forced into the interior of the core 1 by the edges of the housing groove 16 . A rotation of the core 1 relative to the housing 2 is thus possible, so that the locking lever 24 can be rotated by actuating the hand knob. In this state, the spiral spring 9 is tensioned and rests on the closing lever 24 on the right, so that a force is exerted on the coupling ring 3 .

As a rule, the release state is only maintained for a specific period of time, for example a few seconds, in order to ensure that the locking lever can only be actuated for a short time.

Then the motor 7 rotates the motor spindle 6 in the opposite direction and the motor nut 8 pulls the coupling ring 3 back to the left via the spiral spring 9 into the blocking state according to FIG Figure 2a . The spiral spring 9 is relaxed again by the transition from the release state to the blocking state.

Figures 2c - 2d show a schematic view and a cross section of an embodiment of the coupling element according to the invention in the form of a coupling ring 3. The coupling ring 3 has two outwardly protruding, essentially semi-cylindrical shoulders 12 on its outer circumference. An internal thread 25 is provided on its inner circumference, which serves to connect one end of the spiral spring 9 to the coupling ring 3 . The shoulders 12 comprise an engagement surface 5, a spacer surface 10 and a stop surface 11 on their outer surface.

The engagement surface 5 is conically widened outwards relative to the longitudinal axis 23 and thus also relative to the longitudinal axis of the coupling ring 3 in order to achieve the above-described interaction with the connecting means. The angle of the engagement surface 5 relative to the longitudinal axis 23 is approximately 20°. A spacer surface 10 is provided adjoining the engagement surface 5 , the cross section of which runs essentially parallel to the longitudinal axis 23 . Finally, the spacer surface 10 merges into a stop surface 11, which widens outwards in the shape of a circular arc. The radius of the circular arc corresponds approximately to the radius of the balls 4. This ensures that the balls 4 are held securely in the stop surface.

Figure 2e shows a schematic view of a core 1 for this embodiment of the clutch system according to the invention. The core 1 is essentially cylindrical and has a recess for accommodating the motor 7 and the clutch system itself. Four core grooves 13 are arranged offset from one another at approximately 90° on the inner circumference of the recess. The core grooves 13 serve to guide the shoulders 12 of the coupling ring 3. In the core grooves 13, circular recesses 17 are provided for the balls 4 to pass through.

Fig. 2f shows a schematic view of a spiral spring 9 for this embodiment of the clutch system according to the invention. The spiral spring 9 is in one piece and comprises an outer spiral 14 and an inner spiral 15. One end of the outer spiral 14 is connected to the coupling ring 3, for example screwed into the internal thread 25 and possibly also spot welded. The inner spiral 15 is connected to the motor nut 8 so that a movement of the motor nut 8 is transmitted to the coupling ring 3 in a resilient manner.

2g shows a schematic view of a housing 2 for this embodiment of the clutch system according to the invention. The housing 2 is essentially cylindrical and has an eccentrically arranged circular recess for receiving the core 1 . On the inner circumference of the housing 2, four housing grooves 16 are arranged offset from one another by approximately 90°. The housing grooves 16 are used to hold the balls 4. In this exemplary embodiment, the housing grooves 16 have rounded edges to ensure that the balls 4 can be pressed into the core 1 without jamming by manually turning the core 1 in the release state. However, versions with differently shaped housing grooves 16 are also provided.

3 shows a schematic exploded view of a second embodiment of a clutch system according to the invention for an electromechanical lock. A conventional hand knob, which is connected to the core 1, is shown on the left-hand side of this illustration. The core 1 is rotatably mounted in the housing 2. In the idle state, the clutch system is in the blocked state, so that the user cannot rotate the core 1 relative to the housing 2 by turning the hand knob. In the release state, the coupling system releases the core 1 and the user can cause the core 1 to rotate relative to the housing 2 by turning the hand knob. A coupling element in the form of a coupling ring 3 , a spring element in the form of a spiral spring 9 and a coupling element 18 for engaging in a locking lug 19 are arranged in the core 1 . Connection means in the form of two balls 4 are used to positively connect the core 1 to the housing 2.

Figure 4a shows a cross section through this embodiment in the blocked state. In this case, the coupling system according to the invention is used for a cylinder lock with a locking lug 19 . The blocking state shown in this figure represents the idle state of the lock. The coupling system comprises a housing 2 and a core 1 rotatably mounted therein, which is connected to a hand knob on the left-hand side. The core 1 is connected to the locking lug 19 on the right-hand side.

Two balls 4 are provided, which are pressed through a circular recess 17 of the core 1 into housing grooves 16 of the housing 2 . For this purpose, a coupling ring 3 is provided in the core 1, which can be displaced along the longitudinal axis 23 of the core 1. The coupling ring 3 is identical to the embodiment of Figure 2a executed and has on its outer circumference two radially outwardly projecting shoulders 12, each engaging in a core groove 13 of the core 1 for guidance. In the blocking state shown, the balls 4 are pressed by the stop surface 11 on the outer circumference of the coupling ring 3 through the recess 17 into the housing groove 16 and ensure a positive connection of the core 1 with the housing 2 . A rotation of the core 1 relative to the housing 2 is not possible.

In order to switch the clutch system to the release state, the clutch ring 3 must be shifted to the right. For this purpose, the coupling ring 3 is connected via a spiral spring 9 to a motor nut 8 which is arranged in a rotationally fixed manner on a motor spindle 6 of a motor 7 arranged in the core 1 .

Activating the motor 7, for example with an authorized electronic chip card or an authorized RFID chip, causes the motor spindle 6 to rotate. This moves the motor nut 8 to the right along the longitudinal axis 23 and also pulls the spiral spring 9 to the right. The inner circumference of the coupling ring 3 is connected to the spiral spring 9 via an internal thread 25 and is thus also shifted to the right until the release state is reached.

In contrast to the embodiment according to a cam cylinder lock Figure 2a In this case, the spiral spring 9 is connected to a coupling element 18 at the second end of the outer spiral 14 via an internal thread 22 . The coupling element 18 is used for form-fitting engagement in corresponding recesses of the locking lug 19. It is taken into account here that the position of the locking lug 19 generally cannot be ensured, particularly in the case of locks that can be actuated on both sides.

The coupling element 18 is resiliently connected to the coupling ring 3 and the motor nut 8 and can also be displaced along the longitudinal axis 23 . In the blocking state shown, the spiral spring 9 is relaxed and the coupling element does not engage in the locking lug 19 . The locking lug 19 is thus freely rotatable. Figure 4b Figure 12 shows a cross-section through this embodiment when the release state is reached. The motor spindle 6 has moved the motor nut 8 to the right by turning it and has taken the spiral spring 9 and the coupling ring 3 with it. The coupling ring releases the balls 4 on its outer surface and these can be moved into the core 1 along the conical engagement surface 5 . In this state, the spiral spring 9 is stretched. However, the coupling element 18 does not yet engage in the recesses provided in the locking lug 19 but rests against it, so that a force is exerted on the coupling ring 3 via the tensioned spiral spring 9 .

A rotation of the core 1 relative to the housing 2 is possible in this position, so that by actuating the hand knob the coupling element 18 can be moved into that position in which it can engage in the recesses provided in the locking lug 19 . As a rule, the hand knob must be turned by a maximum of 90°.

Figure 4c shows a cross section through this second embodiment in the locked state. The coupling element 18 is shifted completely to the right and snapped into the locking lug 19 . It is thus possible to actuate the locking lug 19 by turning the hand knob.

The release state and latched state is usually only maintained for a certain period of time, for example a few seconds, in order to ensure that the locking lug can only be actuated for a short time. Then the motor 7 rotates the motor spindle 6 in the opposite direction and the motor nut 8 pulls the coupling ring 3 back to the left via the spiral spring 9 . As a result, the coupling element 18 is also entrained and the form fit with the locking lug 19 is released. The spiral spring 9 is relaxed again by the transition from the release state to the blocking state.

Figure 4d shows a schematic view of how the coupling ring 3 and the coupling element 18 are resiliently connected to one another via the spiral spring 9 in this embodiment. The structure of the coupling ring 3 corresponds to the structure described in connection with the first exemplary embodiment. In this exemplary embodiment, the spiral spring 9 is designed with an outer spiral 14 and an inner spiral 15, with one end of the outer spiral 14 being connected to the coupling ring 3 and another end of the outer spiral 14 being connected to the coupling element 18, and the inner spiral 15 being connected to the motor nut 8 .

Figures 4e and 4f show a schematic view and a cross section along the indicated sectional plane of the coupling element 18 for this second embodiment of the clutch system according to the invention. The coupling element 18 is essentially ring-shaped and comprises a carrier ring 21 and two radially and axially outwardly projecting engagement jaws 20. The engagement jaws are offset by 180° on the circumference of the carrier ring and are used for positive engagement in recesses of the locking lug 19.

Depending on the shape and design of the locking lug 19, other shapes of the coupling element 18 and designs of the engagement jaws 20 are of course also provided. In particular, a higher or lower number of engagement jaws 20 can be provided. For connection to the spiral spring 9, the carrier ring 21 of the coupling element 18 has an internal thread 22 on its inner circumference.

The invention is not limited to the embodiments described for use with a lever cylinder, a locking cylinder with a locking lug, a single-sided or double-sided cylinder.

Reference List

1

core

2

housing

3

clutch ring

4

bullet

5

engagement surface

6

motor spindle

7

engine

8th

motor nut

9

spiral spring

10

spacer surface

11

stop surface

12

shoulder

13

core groove

14

outer spiral

15

inner spiral

16

housing groove

17

recess

18

coupling element

19

locking tab

20

engagement jaws

21

carrier ring

22

inner thread

23

longitudinal axis

24

locking lever

25

inner thread

Claims (14)

1. A coupling system for an electromechanical lock, comprising a housing (2), a core (1), which is rotatably mounted in the housing (2), and a displaceable connecting means for positive connection of the core (1) to the housing (2),

   wherein a coupling element is provided, which can be displaced substantially along a longitudinal axis (23) of the core (1) from a release state to a blocking state, wherein in the blocking state the connecting means positively engages the core (1) and the housing (2), and wherein the coupling element, for displacement of the connecting means into the housing (2), has on its outer circumference an engagement surface (5), which widens substantially conically with respect to the longitudinal axis (23), and wherein the coupling element, for substantially axial displacement along the longitudinal axis (23) of the core (1), is connected to a motor spindle (6) of a motor (7) via a spring element, preferably via a spiral spring (9),

   characterized

   in that the coupling element is connected to a motor nut (8), which is arranged on the motor spindle (6) of the motor (7).
2. The coupling system according to claim 1, characterized in that the core (1) is connected to a closing device, for example a closing lever (24), so that the closing device can be actuated in the release state by rotating the core (1) and cannot be actuated in the blocking state.
3. The coupling system according to one of claims 1 or 2, characterized in that the coupling element is designed as a coupling ring (3) which comprises on its outer circumference at least one outwardly projecting shoulder (12), which is guided substantially axially in a core groove (13) of the core (1), the engagement surface (5) preferably being provided on the outer surface of the shoulder (12) and the core groove (13) having a recess for the passage of the connecting means.
4. The coupling system according to one of claims 1 to 3, characterized in that the connecting means is designed as a ball (4) which can be pressed through a preferably circular recess (17) of the core (1) into a housing groove (16) of the housing (2) to bring about the blocking state.
5. The coupling system according to claim 4, characterized in that the coupling element has on its outer circumference, preferably on the outer circumference of the shoulder (12), a stop surface (11), which is widening in a substantially circular arc with respect to the longitudinal axis (23), the radius of the circular arc corresponding substantially to the radius of the ball (4), and wherein a spacer surface (10), which extends substantially equidistantly with respect to the longitudinal axis (23), is preferably formed between the engagement surface (5) and the stop surface (11).
6. The coupling system according to one of claims 1 to 5, characterized in that multiple, preferably two, connecting means are provided, which are preferably arranged substantially evenly distributed on the outer circumference of the core (1).
7. The coupling system according to one of claims 3 to 6, characterized in that multiple, preferably two, shoulders (12) are provided, which are distributed substantially evenly on the outer circumference of the coupling ring (3) and adapted to engage multiple, preferably four, core grooves (13), which are distributed substantially evenly on the inner circumference of the core (1).
8. The coupling system according to one of claims 1 to 7, characterized in that for connecting the core (1) to an actuating element, for example a locking lug (19), a coupling member (18) is provided, which is in resilient connection with the coupling element, can be displaced substantially along the longitudinal axis (23) of the core (1) and is designed for positive engagement in recesses of the actuating element.
9. The coupling system according to claim 8, characterized in that the coupling member (18) for substantially axial displacement along the longitudinal axis (23) of the core (1) is connected via a spring element, preferably via a spiral spring (9), to a motor nut (8), which is arranged non-rotatably on a motor spindle (6) of a motor (7), so that the coupling member (18) is resiliently pressed against the actuating element.
10. The coupling system according to claim 9, characterized in that the spring element is resiliently connected to the coupling element, to the coupling member (18), and to the motor nut (8).
11. The coupling system according to claim 10, characterized in that the spring element is designed as a one-piece spiral spring (9) with an outer spiral (14) and an inner spiral (15), one end of the outer spiral (14) being connected to the coupling element and preferably another end of the outer spiral (14) being connected to the coupling member (18), and the inner spiral (15) being connected to the motor nut (8).
12. The coupling system according to one of claims 8 to 11, characterized in that the coupling member (18) is substantially annular and preferably comprises a carrier ring (21) and preferably two substantially radially and axially outwardly projecting engagement jaws (20), which are designed for positive engagement in recesses of the actuating element.
13. A coupling system according to one of the preceding claims, characterized in that the coupling element for connection to the spring element has internal threads (25) and, optionally, the coupling member (18) for connection to the spring element also has internal threads (22).
14. An electromechanical lock, comprising a coupling system according to one of claims 1 to 13.

Images