WO2019020149A1

WO2019020149A1 - Locking device

Info

Publication number: WO2019020149A1
Application number: PCT/DE2018/100672
Authority: WO
Inventors: Peter Hörschelmann
Original assignee: Gst Gebäude Sicherheitstechnik Gmbh; JuB-Creative Product GmbH
Priority date: 2017-07-28
Filing date: 2018-07-30
Publication date: 2019-01-31
Also published as: EP3658726B1; EP3658726A1; DE102017117139A1

Abstract

The invention relates to a locking device having a housing (1) and a cover (16) which closes the housing, wherein the housing (1) has arranged therein a latch (2) which can be moved back and forth in the housing (1) by means of at least one motor (4, 4a, 4b) and at least one gear mechanism between an open position and a closed position in which the latch (2) projects out of a latch opening on the front side of the housing (1) from the latter. Here, the latch (2) has a lower bolt (10a) and an upper bolt (10b) which interact with a respective bridging plate (9a, 9b) in such a way that the bridging plates (9a, 9b) are held in their centre so as to be rotatable with respect to the latch (2), wherein the bridging plates (9a, 9b) are provided at their ends with openings into which pins (17a, 17b, 22a, 22b) engage, wherein at least two of these pins (17a, 17b) are arranged on a spindle nut (6, 6a, 6b) which is movable on a spindle (5, 5a, 5b), which is rotatably mounted between the front side and the rear side of the housing (1), by means of the at least one motor (4, 4a, 4b) and the at least one gear mechanism.

Description

Designation: Closing device

The invention relates to a locking device according to the preamble of claim 1. Such locking devices are known in many ways from the prior art and are often used as electronically controlled engine locks, which for the closure of high-security doors such as safe doors, strongroom doors or doors of safes use Find. Locking devices of this type are provided with a lockable as a lock and extendable latch. In such locks usually come electric motors combined with spur, worm and / or spindle gears for moving the block acting as a bolt, for example, in a corresponding bolt factory used. In this case, different ways are tracked to accommodate high bolt forces, slightly greater than 1000N.

On the one hand, as disclosed, for example, in DE 10 2011 055 420 B4 or in DE 195 26 660 B4, closing devices are proposed in which, in a closed position, in which the bolt protrudes from a latch opening on the front side of the housing, this direct-acting locks to bring the traction over the bar on a short path to the housing. By such closing devices remains in externally acting force attack the drive mechanism of the bolt relieved. However, such closing devices are very complicated and expensive due to the additional and temporally offset from the actual locking movement blocking operations. In addition, the often complicated mechanisms of such closing devices have inadequate operational safety, whereby the individual components in series production also require a very high quality.

In other solutions, in which often a real redundancy is made possible by an endlessly acting differential element, as disclosed for example in EP 0 582 742 A1, the coupled to the bolt drive mechanism is kept very solid and with an early onset self-locking effect in consequence of Self-locking equipped. But all parts, especially the differential member of the entire drive train of the bolt from the bolt to reach the self-locking gear, the high from the outside can withstand acting forces. In particular, with redundant locks there is a space problem, since these locks should reach with large, double running components and the compact, standard standardized dimensions simple locks. Furthermore, such solutions often have the problem of allowing a sufficient travel of the bolt from the closed position to the open position or from the open position to the closed position, which is 15 mm in many locks.

DE 195 26 660 B4 and DE 901 108 111 disclose differential levers known as levers. In the case of the local closing devices, however, it appears that such a lever driven by threaded spindles, which acts as a differential, is rotatably mounted directly or indirectly on the bolt and either does not reach the necessary path lengths for the bolt without further measures or does not permit sufficient force absorption. Thus, for example, the closure device described in DE 195 26 660 B4 in case of failure of a drive motor only able to open the lock with the remaining motor, but not completely close. Such behavior does not meet the safety requirements imposed on true redundant shutters.

The object of the invention is therefore to overcome the disadvantages known from the prior art and to enable a locking device in a compact and simple design, in which as few parts are needed and meets the required safety requirements. In this case, such a refinement should be feasible both for redundant closing devices and for simple motor-operated closing devices.

This object is achieved by a locking device with all features of patent claim 1. Advantageous embodiments of the invention can be found in the subclaims.

The closing device according to the invention in this case has a housing and a cover that closes this housing. In this case, a latch is arranged in the housing, which can be moved back and forth in the housing by means of at least one motor and at least one transmission device between an open position and a closed position, in which the latch protrudes from a latch opening on the front side of the housing. The locking device according to the invention is now characterized by the fact that the bolt has a lower bolt and an upper bolt, which in each case with a bridge board in such a way cooperate, that the bridge boards are rotatably supported in their center with respect to the bars, wherein the bridge boards are provided at their ends with openings, in which pins engage, wherein at least two of these pins are arranged on a spindle nut, which on one between the front and the Rear side of the housing rotatably mounted spindle by means of the at least one motor and the at least one transmission device are movable.

By means of the invention, it is possible to realize a finite differential element designed as a double bridge by the two bridge boards and to remedy the previous difficulties, in particular in the case of redundant locks with two drives. Here, the locking device according to the invention with a minimum of parts feasible, with the use of a single drive train with a motor, a transmission device and a spindle and a spindle running thereon, the realization of a simple motor lock is possible, while using two such drive trains a redundant locking device is realized. In both cases, it is possible by the closing device according to the invention that it is very compact and meets the appropriate safety requirements for such closing devices. By using the two bridge boards can namely achieve a very compact, stable construction of the locking device, which is achieved by the drive train using the spindle nut, the spindle, the transmission device and the motor self-locking, which starts early and offers a corresponding Selbstsperreffekt.

Thus, with the use of two drive trains, the invention makes it possible to provide a highly secure locking device which operates redundantly. On the other hand, it is made possible by the simple removal of a drive train and by supplementing this drive train by a Festsetzkomponente to realize a simple motorized locking device, which operates in principle according to the redundant locking devices and the common standards and safety requirements into account. It has proved to be advantageous in a first embodiment of the invention, that the lower bolt and the upper bolt are formed as the ends of a bolt which is rotatably guided by an always located on the housing end of the bolt through hole and joined rotatably with the bridge boards , This ensures that the bolt forms a unit with the bridge boards and thus a double bridge, which is rotatably supported on the latch. By means of the at least one drive is now the bolt from a closed to an open position and also moved back. In principle, it has been proven that, for an increased force absorption, the joint between the bolt and the bridge boards is conceivable in addition to a simple interference connection, for example by means of a welded connection, riveted connection or embossed connection by massive metal deformation.

According to a further aspect of the invention, it is advantageously provided that the spindle nut have pins adjoining the two pins cooperating with the openings of the bridge plates, which pins are guided in grooves of the housing or of the cover. This makes it possible that these cooperating with the bridge plates pin closely abut the openings, while the adjoining pins are supported on the housing or the lid of the closing devices in corresponding grooves. This also ensures a corresponding force absorption, so that also increased safety aspects and the general reliability of the locking device according to the invention is taken into account.

It has also been proven that the spindle nut has an upper end face and a lower end face, which is followed by the cooperating with the openings of the bridge plate pin, preferably the height of these pins corresponds to the thickness of the bridge boards. This embodiment of the invention again aims in the direction of increased power consumption of the closing devices according to the invention. Since the bridge boards abut both on the corresponding end faces and on the cover or the housing, namely, an increased power consumption is possible, resulting in an increased reliability of the locking device according to the invention.

According to a further aspect of the invention, a motor board is provided for the at least one motor, which is preferably insertable at the front side of the housing in corresponding slots of the housing and the cover. This embodiment of the invention aims at an increased power consumption of the locking device according to the invention. By receiving the motor board in corresponding grooves on the housing or on the lid is namely such an increased power consumption of the locking device according to the invention allows.

Furthermore, it is therefore also provided to arrange on the back of the housing frame plates, which are preferably also inserted in corresponding grooves of the housing and the lid, so that this also results in increased reliability and increased power consumption of the locking device according to the invention.

According to a further aspect of the invention, it has proven successful that the at least one transmission device consists of a first gear seated on the drive axle of the motor, a second gear wheel seated on the axis of rotation of the spindle and an intermediate gear meshing therewith. This makes it possible to equip the transmission device with as few components as possible, while still an increased intrinsic resistance can be realized, which takes into account the reliability and increased power consumption of the locking device according to the invention. Alternatively, it can of course also be provided that a seated on the drive axle gear directly meshes with a seated on the axis of rotation of the spindle gear and this is driven directly. Again, the increased reliability and the increased power consumption of the locking device according to the invention is ensured. According to a further aspect of the invention, it has also been found to be advantageous to provide detectors for detecting the position of the bridge boards, which preferably each consist of a magnet arranged on one of the bridge boards and a corresponding Hall sensor, the Hall sensor preferably being in the Housing or is arranged on the lid of the housing. With this embodiment of the invention, it is possible in a simple manner to determine the exact position of the bridge boards with a corresponding design of the Hall sensors, without having to open the locking device according to the invention. Of course, the corresponding detector unit can of course also be equipped in such a way that at least corresponding end positions of the bridge boards can be recognized by the corresponding detectors.

In order to realize a redundant locking device according to the invention, it has been proven that two motors, two gear units and two spindles provided with a spindle nut are provided inside the locking device. This makes it possible that both bridge boards are movable with their two ends within the housing of the locking device. In particular, this ensures that in case of failure of an engine closing device can be closed and opened. In this case, it is also possible that each motor in conjunction with the corresponding gear device and the corresponding spindle and spindle nut is suitable for transferring the bolt of the locking device from its closed position to an open position and vice versa.

Alternatively, it is also provided that exactly one motor is used, which drives exactly one spindle and thus exactly one spindle nut via exactly one transmission device. As a result, a simple, non-redundant motor-operated locking device according to the invention is realized in a simple manner, in which also the reliability is realized with high power consumption in a compact design.

Other objects, advantages, features and applications of the present invention will become apparent from the following description of embodiments with reference to

Drawings. All described and / or illustrated features alone or in any meaningful combination form the subject matter of the present invention, also independent of their summary in the claims or their dependency. Show it:

FIGS. 1 to 5: a first exemplary embodiment of a closing device according to the invention in various illustrations,

FIG. 6 shows a spindle nut of the closing device of FIGS. 1 to 5,

FIGS. 7 to 10: the embodiment of the closing device according to the invention

FIGS. 1 to 5 in further different representations,

Figures 11 to 13 a second embodiment of an inventive

Locking device in various representations,

Figure 14: a fixed bearing bolt of the locking device of Figures 1 to 13 and FIG. 15: the embodiment of the closing device according to the invention

Figures 11 to 13 in a further illustration.

FIGS. 1 to 5 show a first exemplary embodiment of a closing device according to the invention. This locking device is designed as an electromechanical, redundant safe lock with double motor drive. Figures 1 to 5 illustrate the locking device in different, normal operating conditions.

When removed as an electromechanical lock closure device of Figures 1 to 5 a displaceable between a closed position and an open position latch 2 is arranged in a housing 1, which is closable with a cover 16. The bolt 2 has at its inner end a through hole into which is rotatably mounted a solid steel bolt 10 is inserted, whose ends are referred to herein as the lower bolt 10a and upper bolt 10b.

Again, at both ends of this steel bolt 10 and the lower bolt 10a and the upper bolt 10b, an upper bridge board 9a and a lower bridge board 9b are respectively fixed. For an increased power consumption at this juncture in addition to a simple oversize connection, for example, welded joints, rivet joints or embossed connections by massive Metallumformug conceivable. At the ends of the upper bridge board 9a and the lower bridge board 9b openings are mounted, which are formed in this embodiment as massive fork-shaped recesses. In these recesses each spindle nuts 6a and 6b engage with upper pin 17a and lower pin 17b. The spindle nuts 6a and 6b are guided by spindles 5a and 5b engaged therewith. In addition, the spindle nuts 6a and 6b secured by introduced grooves in the cover 16 and the housing 1 with the pins 17a and 17b subsequent pin 19 against rotation. The grooves also ensure that when excessive force on the bolt (for example, 1000N) and a possibly existing inclination of the bridge boards 9a and 9b, the spindle nuts with slight bending of the spindle rotation axis on the pins 19 on Housing and can support the lid.

The spindles 5a and 5b are in turn rotatably supported in rear frame boards 7a and 7b and in front motor boards 3a and 3b. The rack boards 7a and 7b and the motor boards 3a and 3b are inserted into grooves of the housing 1 and the lid 16. In order to ensure a sufficient travel of the spindle nuts 6a, 6b for a true redundancy of the castle, must be at least 45 mm movable in this principle presented here with wegendlichem differential and the achievement of a bolt thrust of 15 mm, the respective spindle nut. To accomplish this, as shown in Figure 6, the spindle nuts receive flattened surfaces 18a and 18b facing the rack plates and the motor boards. As a result, the spindle nuts are flat, but can still absorb high forces. In addition, the rack boards 7a and 7b and the motor boards 3a and 3b are designed such that the force required for receiving wide forked surfaces of the bridge boards 9a and 9b may be partially superimposed over or under them.

On the motor boards 3a and 3b, the motors 4a and 4b are fixed. In addition, the motor boards 3a and 3b take a fixed position via a bore in each case an intermediate axis. The torque, which is supplied by the respective motors 4a and 4b is finally without reduction of the speed of a seated on the drive axle of the respective motor 4a or 4 b gear 13a, 13b via an intermediate axis mounted on the intermediate gear 12a, 12b on a Spindles 5a and 5b driving gear 11 a, 11 b passed. In this case, the gears 13a, 13b of this spur gear with fully retracted latch 2 in the

Immerse the bolt block back. This makes it possible to allow a large travel of the spindles 5a and 5b of 45 mm, because now the spur gear can be introduced extremely far forward in the housing 1. When the bolt 2 is extended, the bolt mouth remains closed and the bolt 2 can still absorb very high transverse forces.

FIG. 1 shows the form of an electromechanical safe lock Locking device in fully open position. They are both

Spindle nuts 6a, 6b at a distance from the rear frame boards 7a, 7b of more than 15 mm and the bolt 2 is fully retracted. In order to close the lock and always generate the same bolt thrust or even bar tensile force in normal and redundancy case, initially only one of the two motors 4a, 4b is controlled. In the case of the motor 4a, this ensures that the spindle nut 6a is moved by 15 mm in the direction of the motor board 3a. As a result, the bolt 2, as shown now in FIG. 2, moves out of the housing 1 by 7.5 mm. In this situation, an angle is formed not equal to 90 ° between the bridge boards 9a, 9b

Riegelschubachse off. In order to complete the closing process, the other motor 4b is now activated and its associated spindle nut 6b also moves 15 mm towards the motor board 3b. As a result, the bolt 2 moves out again by 7.5 mm from the housing and reaches a total as shown in Figure 3 its maximum extension of 15 mm.

In the sectional view of Figure 4, the arrangement of the bridge boards 9a and 9b to be shown in the z direction. For high power is formed by the upper bridge board 9a and the lower bridge board 9b a double bridge. The motors 4a and 4b lie in the space between the bridge boards 9a and 9b. They are thus surrounded by the respective section of the upper bridge plate 9a, the bolt 2, the respective section of the lower bridge board 9b and the respective spindle nut 6a and 6b. The spindles 5a and 5b and the spindle nuts 6a and 6b are located very far outside in the housing. 1 This means that, viewed from the inside outwards, not only the bolts 2 but also the motors 4a and 4b and then the spindles 5a and 5b with their spindle nuts 6a and 6b are arranged. This has the advantage that in deflections of the bridge boards 9a, 9b, the position of the spindle nuts 6a and 6b only slightly from the 90 ° angle with respect to the

Latch thrust axle deviates. As a result, a high power is always possible and a force acting on the spindle nuts 6a and 6b to the outside, which the

Spindles 5a and 5b and the grooves in the housing 1 and the cover 16 would load, therefore, acts only very weakly on the spindles 5a and 5b. In Figure 5, the lock with cover 16 is shown in section. Here is seen as a feature that the openings or bifurcation of the

Bridge boards 9a, 9b between cover 16 and between housing 1 and end face surfaces 20a and 20b of the spindle nuts 6a and 6b are included. At very high forces acting on the bolt 2, thereby the bridge boards 9a, 9b can not bend and get out of engagement with the pins 17a and 17b of the spindle nuts 6a and 6b. Figures 7 to 10 illustrate the designed as a redundant electromechanical safe lock closure device of Figures 1 to 5 at different

Emergency situations, for example, if one of the two motors 4a or 4b is defective in the fully open and in the fully closed state. In the position of the electromechanical safe lock in Figure 7 is a first

Extreme case represented in case of failure of a drive train. Here, the engine 4b has failed in the open position. In this situation, however, the drive train with the motor 4a alone manages to fully close and open the lock. in the

closed state reaches the spindle nut 6a while the motor board 3a. It can be seen here how the bridge boards 9a and 9b partially overlap

or under the motor board 3a. It is understood that the case shown in Figure 7 would work just as well for the other side. Thus, if the motor 4a had failed, then the further drive train with the motor 4b would have the ability to fully open and close the lock.

Should a defect of a drive train occur during the process, as shown in FIGS. 9 and 10, then of course the respective other strand can completely open or close the lock. Here, the still operable motor 4a is always turned off after reaching the limit positions of the bolt 2. In this case, the still active strand with the corresponding spindle nut 6a no longer reaches the motor board 3a as shown in FIG. 10 in the closed position and in the closed position Open position must drive the spindle nut 6a beyond the typical home position, as shown in Figure 9.

The other extreme case is shown in FIG. Here, motor 4a has failed in the closed position of the bolt 2. In this case, the remaining strand with the motor 4b but the castle completely open or close. In this situation, when the lock is opened, the spindle nut 6b reaches the rack board 7b. It can be seen that the bridge boards 9a, 9b pass above and below the frame board 7b. Due to the symmetrical design of the redundant lock, it does not matter which strand fails, it is always the other strand still able to fully open and close the lock. The cases not shown here are then only mirror-symmetrical to the sitter to see. Figures 11 to 13 and 15 show a second embodiment of a

Locking device according to the invention, which is designed here as an electromechanical safe lock with a motor drive or a motor 4, in different operating conditions. The two formed as a differential bridge boards 9a and 9b are fixed on one side by means of a fixed bearing pin 21.

In FIG. 14, the fixed bearing pin 21 is shown separately in detail as a fixing component. The locking device of Figures 11 to 15 and 13 is in this case not redundant and it is only the motor 4, a spindle 5, a spindle nut 6, a

Motor board 3 and only a transmission device with gears 11, 12 and 13 are provided. In order to fix the bridge boards 9a and 9b on the one side, a fixed bearing pin 21 is inserted into the housing 1 and into the cover 16 at the location of the no longer present second spindle nut. In the section of Figure 15 it can be seen that this between the housing 1 and the cover 16 in holes is used. The fixed bearing pin 21 is longer than the spindle nut 6, wherein the length of the fixed bearing pin 21 corresponds approximately to the entire lock height, and therefore reaches beyond housing grooves housing bores in which he is stuck. Since the same housing 1 and the same cover 16 are to be used both for redundant locks and for simple locks, these holes are closed in the redundant lock either with simple plugs or they are created by tool inserts only for the simple lock in these components. The fixed bearing pin 21 shown in Figure 14 also has according to

Spindle nut 6, which corresponds to the spindle nuts 6a and 6b of the redundant locking device of Figure 6, end faces 20a, 20b, to push away the

Bridge boards 9a and 9b to prevent at increased bolt forces. That is, the ends of the bridge boards 9a, 9b are also in this simple lock from

Housing 1, from the lid 16, from the spindle nut 6 and the

Fixed bearing bolt 21 included.

In Figure 11, the simple lock is now shown in the open position. It can be seen how the bridge boards 9a, 9b are rotatably connected via the fixed bearing pin 21 on one side of the lock. The spindle nut 6 with the entire drive train together with the motor 4 is located on the other side of the lock. It has gone in the open state far back in the direction of the frame board 7b.

FIG. 12 shows the simple electromechanical lock in another

Operating condition in which the lock is already half open or half closed. In this situation, the spindle nut 6 is based on the lock housing 1 at the same height with the fixed bearing pin 21st

In addition, FIG. 13 also shows the closed state of the simple one

shown electromechanical lock. In this case, the spindle nut 6 is driven far forward in the direction of the motor board 3 and the bolt 2 is relative to the housing first fully extended.

It is understood that corresponding limit switches or detectors are used both for the simple and for the redundant-working lock for detecting the latch and / or bridge board positions. In the simplest case, this can be done via magnets 14a, 14b and Hall sensors. By the switches or detectors on the lock electronics, the geared motors 4a, 4b switched on and / or off in the desired end positions, moreover failures of a drive train are detected and accordingly with the

remaining strand under error message nor the lock opened or closed. By multiple arrangement of such limit switches with

different distance and a selector switch mounted on one

Connector board 8a and 8b can be activated and deactivated different end positions of the bolt 2. With this measure, it is possible to set different Riegelausfahrwege the lock depending on the location.

LIST OF REFERENCE NUMBERS

1 housing

2 bars

3 motor board

3a motor board

3b motor board

4 engine

4a engine

4b engine

5 spindle

5a spindle

5b spindle

6 spindle nut

6a spindle nut

6b spindle nut

7 rack board

7a frame board

7b rack board

8 connector board

8a connector board

8b connector board

9a upper bridge board

9b lower bridge board

10 steel bolts

1 1 gear

11 a gear

11 b gear

12 intermediate wheel

12a intermediate wheel

12b intermediate wheel 13 gear

13a gear

13b gear

14 magnet

14a magnet

14b magnet

15 circuit board

15a circuit board

15b circuit board

16 lids

17a cones

17b cones

18a front surface

18b back curses

19 cones

20a face

20b lower end face

21 fixed bearing bolts

22a cones

22b cones

Claims

claims

1. closing device with

a housing (1) and

a cover (16) closing the housing,

wherein in the housing (1) a latch (2) is arranged, by means of at least one motor (4, 4a, 4b) and at least one transmission device between a

Open position and a closed position, in which the bolt (2) from a

Latch opening at the front of the housing (1) protrudes from this, in the housing (1) is movable back and forth,

characterized in that

the bolt (2) has a lower bolt (10a) and an upper bolt (10b), which cooperate with a respective bridge board (9a, 9b) in such a way that the

Bridge boards (9a, 9b) are rotatably supported at their center relative to the latch (2), the bridge boards (9a, 9b) being provided at their ends with openings in which pins (17a, 17b, 22a, 22b) engage,

wherein at least two of these pins (17a, 17b) on a spindle nut (6, 6a, 6b) are arranged, which on a between the front and the back of the housing (1) rotatably mounted spindle (5, 5a, 5b) by means of at least a motor (4, 4a, 4b) and the at least one transmission device is movable.

2. Apparatus according to claim 1, characterized in that the lower bolt (10 a) and the upper bolt (10 b) are formed as the ends of a bolt (10) by a in the housing (1) lying in the end of the bolt (2 ) arranged

Through hole rotatably guided and with the bridge boards (9a, 9b) is joined non-rotatably.

3. Device according to one of the preceding claims, characterized in that the spindle nut (6, 6 a, 6 b) to the two with the openings of the bridge boards (9 a, 9 b) cooperating pin (17 a, 17 b) subsequent pins (19), which in grooves of the housing (1) and the lid (16) are guided.

4. Device according to one of the preceding claims, characterized in that the spindle nut (6, 6 a, 6 b) has an upper end face (20 a) and a lower end face (20b), to which the pins (17a, 17b) cooperating with the openings of the bridge boards (9a, 9b) adjoin, wherein preferably the height of these pins (17a, 17b) corresponds to the thickness of the bridge boards (9a, 9b).

Device according to one of the preceding claims, characterized in that for the at least one motor (4, 4a, 4b) a motor board (3, 3a, 3b) is provided which preferably at the front of the housing (1) in corresponding grooves of the Housing (1) and the lid (16) is inserted.

Device according to one of the preceding claims, characterized in that on the back of the housing frame plates (7a, 7b) are provided which are preferably inserted in corresponding grooves of the housing (1) and the lid (16).

Device according to one of the preceding claims, characterized in that the at least one transmission device consists of a on the drive shaft of the motor (4, 4a, 4b) seated first gear (13, 13a, 13b), one on the axis of rotation of the spindle (5, 5a , 5b) seated second gear (11, 11a, 11 b) and an intermeshing with this intermediate gear (12, 12a, 12b) consists.

Device according to one of the preceding claims, characterized in that detectors for bearing detection of the bridge boards (9a, 9b) are provided, preferably each of a on one of the bridge boards (9a, 9b) arranged magnet (14, 14a, 14b) and a thereto corresponding Hall sensor exist.

Device according to one of the preceding claims, characterized in that two motors (4a, 4b), two gear units and two with a spindle nut (6a, 6b) provided spindles (5a, 5b) are provided. 10. Device according to one of claims 1 to 8, characterized in that exactly one motor (4) is provided which drives exactly one spindle (5) and thus exactly one spindle nut (6) via exactly one transmission device.