Motor vehicle lock for a closure element of a motor vehicle

Abstract

The present invention relates to a vehicle lock (1) for a locking element of a motor vehicle, the vehicle lock (1) having at least one latch (2) and a locking pawl (3) as a lock assembly, wherein a circuit board (9) having an electronic assembly (10) is arranged within a housing of the vehicle lock (1), wherein a plug-in element (14) is provided in the housing for connecting at least a portion of the electronic assembly (10) to an external control unit, wherein at least one position sensor (16) for the lock assembly is provided on the circuit board (9). The present invention proposes that the position sensor (16) is configured as a reed switch, which is actuated via a magnetic element (17) corresponding to the lock assembly, and the reed switch is adapted to switch a switching circuit connected via the plug-in element (14) according to the position of the magnetic element (17).

Description

[0001] The present invention relates to a motor vehicle lock for a closing element of a motor vehicle as described in the preamble of claim 1, a motor vehicle locking system as described in claim 12, and a method for operating a motor vehicle lock as described in the preamble of claim 13.

[0002] This type of vehicle lock is applicable to all types of closures on a motor vehicle. The term "closure" includes, for example, rear covers, trunk lids, hoods, side doors, tailgates, windows, and pop-up roofs. Closures can be installed on the motor vehicle in a manner that allows them to pivot and / or move longitudinally.

[0003] The prior art upon which this invention is based (DE 10 2020 115 879 A1) relates to a motor vehicle lock having locking components such as a latch and a locking pawl. The latch is capable of engaging with a locking member in at least one locked position, wherein the latch releases the locking member in an open position. The locking pawl prevents the latch from displacing to the open position in an engaged position and releases the latch in a released position.

[0004] Furthermore, known vehicle locks incorporate position sensors that detect various lock states to, for example, activate auxiliary functions such as door closing assist devices, or indicate to the user that the closing element is not fully closed. Position sensors can detect the position of lock components directly or indirectly, particularly the position of locking components such as the latch and locking pawl. In the prior art (DE 10 2020 115 879 A1), the position sensor is implemented as a microswitch, which requires mechanical contact with the lock components and is therefore often located in the wet area of ​​the vehicle lock housing.

[0005] The problem to be solved by the present invention is to provide a motor vehicle lock that makes it possible to detect the lock status in a particularly simple and flexible manner.

[0006] The above problem is solved by the features of claim 1.

[0007] The basic idea is to use a non-contact position sensor to simplify the electronic connection of the position sensor. This allows the sensor to be arranged on a circuit board along with other electronic components, particularly in the dry area of ​​the vehicle's lock housing. However, to achieve lock status querying independent of other electronic components, a reed switch is used, which is queried in a simple manner via an external control unit (such as a door control unit).

[0008] Specifically, the present invention proposes that the position sensor be configured as a reed switch, which can be driven by a magnetic element corresponding to the locking assembly, and the reed switch is adapted to switch a switching circuit connected via a plug-in element according to the position of the magnetic element.

[0009] The solution proposed in this invention makes it possible to arrange position sensors in motor vehicle locks with the dry and wet zones substantially separated, which is the subject of claim 2.

[0010] In the design according to claims 3 to 5, the drive is configured to be performed via a magnetic element that is spaced apart from the support of the locking assembly in another plane, thereby minimizing the influence of the metal components on the magnetic element. This spacing is preferably achieved via an extension element, which can also be used for the spring connection of the locking assembly for pre-tensioning.

[0011] A particularly preferred design is that according to claim 6, the position of the lock assembly is detected by means of a secondary detection area of ​​a reed switch via a magnetic element, thereby achieving particularly accurate detection. Furthermore, this allows multiple reed switches to be arranged with small intervals to detect multiple positions, all driven by the same magnetic element, as further explained in claim 9.

[0012] The advantageous dual use of the reed switch is described in claim 7, wherein the main detection area and the secondary detection area are used to detect different lock components.

[0013] Especially when querying the latch, the reed switch can perform safety-related functions, such as activating the vehicle's alarm system based on the detected latch open position. To prevent tampering with the reed switch via an applied external magnetic field, the design according to claim 10 includes an additional tamper-proof reed switch that also responds to the applied magnetic field, thereby enabling the identification of tampering attempts.

[0014] According to another teaching of independent claim 12, a motor vehicle locking system having the motor vehicle lock proposed in this invention and a control unit connected via a plug-in element is claimed. Reference may be made to all embodiments of the motor vehicle lock proposed in this invention.

[0015] According to another teaching described in claim 13, which is also an independent claim, a method for operating a motor vehicle lock is claimed. Importantly, the position sensor is configured as a reed switch, which can be driven via a magnetic element corresponding to the lock assembly, and a switching circuit connected via a plug-in element switches according to the position of the magnetic element using the reed switch. Reference can be made to all embodiments of the motor vehicle lock and the proposed motor vehicle locking system of this invention.

[0016] The invention will be explained in more detail below with reference to the accompanying drawings, which illustrate embodiments only. In the drawings:

[0017] Figure 1 An exploded view of the vehicle lock proposed in this invention is shown;

[0018] Figure 2 Show Figure 1 A cross-sectional view of a motor vehicle lock; and

[0019] Figure 3 A schematic top view showing the latch and position sensor.

[0020] The embodiment shown in the figure, and preferred in this respect, relates to a motor vehicle lock 1 for a closure element used in a motor vehicle. Here, the design of the closure element mentioned in the introduction is particularly applicable.

[0021] In principle, the vehicle lock 1 has multiple locking components. These components primarily include locking elements, which participate in the actual locking function of the vehicle lock 1. See also... Figure 1 It is equipped with a latch 2 and a locking pawl 3 as locking components.

[0022] The latch 2 is capable of engaging with a locking element (not shown) in at least one locked position. The latch 2 correspondingly secures the locking element, thereby holding the closing element in its position. The locking element may be, in particular, a locking bow or a locking pin. The locking element may be located at the closing element, particularly at a side door, while the motor vehicle lock 1 may be located at the vehicle body. A reverse arrangement is also conceivable. The latch 2 has a locking element receiving portion 4 into which the locking element can slide on a sliding track to maintain engagement with the latch 2. The latch 2 can also be moved to an open position, in which the locking element is released. Preferably, the latch 2 is configured to pivot about a geometric latch axis 5.

[0023] The locking pawl 3 locks the latch 2 in the locked position when engaged and releases the latch 2 in the released position. Here, the term "locking" generally refers to the locking pawl 3 holding the latch 2 in the corresponding locked position in a certain way. The term "locking" should be interpreted broadly and does not necessarily include snap-fit ​​locking or similar methods. In one design, the locking pawl 3 is part of a locking pawl system that can be put into a locked state in which the locking pawl system locks the latch 2 in the locked position. Preferably, the locking pawl 3 is configured to pivot about a geometric locking pawl axis 6. Figure 1In the illustration, the locking pawl 3 is in the engaged position and locks the latch 2 in its main locked position via engagement with the main slot 7 of the latch 2. Furthermore, according to a preferred design, a pre-locked position (not shown) is provided for the latch 2, in which the latch 2 can be locked by means of the locking pawl 3 via engagement with the pre-slot 8.

[0024] A circuit board 9 containing electronic components 10 is arranged within the housing of the vehicle lock 1. The circuit board 9 serves as a carrier and enables the electrical connection of the electronic components 10. Particularly preferably, the circuit board 9 is equipped with the electronic components 10 via SMD technology, which in principle can perform various functions related to the operation of the vehicle lock 1. Preferably, the vehicle lock 1 has an electrically operated opening drive 11, which electrically lifts the locking pawl 3. The opening drive 11 has an electrically driven motor 12, which applies a driving force to the locking pawl 3 via a mechanical drive chain 13 to lift it. The electronic components 10 can be, for example, used to drive the drive motor 12 of the opening drive 11, and in this respect can be designed as switching elements, capacitors, microcontrollers, etc.

[0025] The housing of the vehicle lock 1 is typically the outer casing of the components of the vehicle lock 1, wherein the lock components are at least partially arranged within the housing. In principle, the housing can be implemented as a multi-piece unit, as shown in a simplified manner in the accompanying drawings. Preferably, the housing houses the circuit board 9, the latch 2, and the locking pawl 3.

[0026] A connector 14 is provided at the housing for connecting at least a portion of the electronic components 10 to an external control unit. The control unit may be a door control unit or a cover control unit, particularly positioned technically above the electronic components 10 of the vehicle lock 1. For example, the control unit, via its connection to the connector 14, actuates the electrically operated opening actuator 11.

[0027] The plug element 14 can be configured as a socket having contact elements 15 for connection to a control unit, wherein the connection is achieved, for example, via a multi-core power supply cable (not shown) and a plug complementary to the socket. The plug element 14 can be at least partially disposed on the circuit board 9. Preferably, the contact elements 15 are arranged on the circuit board 9, and the housing specifically has an opening that, together with the contact elements 15, forms the socket.

[0028] At least one position sensor 16 for the locking assembly is provided on the circuit board 9. The position sensor 16 is used to detect at least one position of the locking assembly, particularly the position of the latch 2 and / or the locking pawl 3. In the embodiment explained herein, at least one locked position of the latch 2 is detected by means of the position sensor 16. These explanations also apply to other locking assemblies.

[0029] Importantly, the position sensor 16 is configured as a reed switch that can be driven via a magnetic element 17 corresponding to the locking assembly, and the reed switch is adapted to switch the switching circuit connected via the plug-in element 14 according to the position of the magnetic element 17.

[0030] In principle, a reed switch is an electrical switching element capable of non-contact switching via a magnetic element 17, specifically in a closed switch state when the magnetic element 17 is within the detection area, and in an open switch state otherwise. The switching between the closed and open switch states is referred to herein as "actuation" via the magnetic element 17. Here, the position sensor 16 may have multiple reed switches. The reed switches are preferably mounted on the circuit board 9 via SMD technology. The reed switches may have a protective coating.

[0031] A switching circuit can be formed by connecting to the plug element 14, in which a reed switch is connected, such that the electronic characteristics of the switching circuit depend on whether the reed switch is in a closed or open switching state. Preferably, at least two of the contact elements 15 of the plug element 14 are interconnected via reed switches. In a particularly simple design, the switching circuit is opened or closed via reed switches, wherein the reed switches, for example, open or close the electrical connection between the contact elements 15. Typically, the resistance between at least two contact elements 15 of the plug element 14 can depend on the switching state of the reed switch.

[0032] Therefore, using the solution proposed in this invention, even when other electronic components 10 of the vehicle lock 1 are unavailable (this may occur, for example, when the power supply voltage is interrupted or the electronic component 10 malfunctions), the position of the lock components can be queried by means of an external control unit. This achieves a particularly simple and robust connection for the control unit compared to using Hall sensors.

[0033] The use of a reed switch also makes a particularly advantageous arrangement of circuit board 9 and the locking assembly possible. Unlike... Figure 1 and Figure 2 As shown in the diagram, the reed switch can also be arranged on the side of the circuit board 9 away from the lock assembly.

[0034] Preferably, the housing is divided into a dry zone 19 and a wet zone 20 via a housing partition 18. The dry zone 19 is a spatial segment formed by the housing, which houses a humidity-sensitive component and is sealed to prevent moisture intrusion. Preferably, the housing partition 18 seals the dry zone 19 and the wet zone 20, wherein the housing partition 18 has only a sealed through-hole 21 for opening the drive chain 13 of the drive device 11. The drive motor 12 is preferably also located in the dry zone 19. Preferably, the dry zone 19 is provided with a sealed plug-in element 14. Preferably, the dry zone 19 is thus sealed and surrounded by the housing partition 18 and the first housing portion 22.

[0035] A circuit board 9 with a reed switch is arranged in the dry zone 19. The lock assembly, detected by the reed switch, preferably together with the magnetic element 17, is arranged in the wet zone 20. The wet zone 20 is here implemented to be partially open to the surrounding environment, which is preferably achieved through an inlet 23 for inserting the locking element into the latch 2. Figure 1 In the illustration, the housing partition 18 is connected to a second housing portion 24, which partially surrounds the wet area 20 and the locking assembly.

[0036] Preferably, the lock assembly, detected by a reed switch, is supported between the locking plate 25 and the reinforcing plate 26 in the cross-section of the vehicle lock 1. This cross-section is preferably perpendicular to the locking plane of the vehicle lock 1, in which the locking force between the latch 2 and the locking pawl 3 is transmitted. The locking plate 25 is arranged on the outside of the vehicle lock 1 and preferably also serves to secure the vehicle lock 1 to the vehicle. The aforementioned inlet 23 is at least partially provided in the locking plate 25.

[0037] The locking plate 25 and the reinforcing plate 26 here form a support position for a support pin that accommodates a pivotable locking assembly, and preferably form the latch axis 5 of the latch 2. The locking plate 25 and the reinforcing plate 26 are preferably implemented as a reinforcing structure for supporting the locking assembly.

[0038] The magnetic element 17 is arranged in the plane between the reinforcing plate 26 and the circuit board 9 in cross-section, and particularly in the plane between the reinforcing plate 26 and the housing partition 18, as can be further seen. Figure 2 This easily avoids the metal components, namely the locking plate 25 and the reinforcing plate 26, from affecting the detection performed via the reed switch.

[0039] In the illustrated design, the lock assembly (here, latch 2) detected by the reed switch has an extension element 27 extending from the region between the locking plate 25 and the reinforcing plate 26, at which a magnetic element 17 is arranged. The extension element extends in cross-section into the region between the reinforcing plate 26 and the circuit board 9, particularly the region between the reinforcing plate 26 and the housing partition 18, thereby allowing the magnetic element 17 to be positioned close to the circuit board 9 and thus close to the reed switch. Preferably, the extension element 27 and the remainder of the lock assembly are arranged in a rotation-resistant manner. Particularly preferably, the extension element 27 is at least partially made of plastic and is specifically configured as an injection-molded part.

[0040] In the illustrated design, the extension is formed separately from the rest of the latch 2 and is also supported on the latch axis 5. In another design, not shown, the extension may be integrally formed with the cover of the lock assembly, for example, integrally formed with the plastic cover of the metal core of the latch 2 or the locking pawl 3.

[0041] The extension element 27 preferably maintains a distance of at least 5 mm, and particularly preferably at least 8 mm, from the metal parts of the vehicle lock 1 (e.g., the reinforcing plate 26, the locking plate 25, the metal core of the lock assembly, etc.).

[0042] More preferably, the locking assembly is preloaded via mechanical contact between the extension element 27 and the spring 28. By using the extension element 27 (which is specifically configured to be separate from the locking assembly), the point of action of the spring 28 can be correspondingly freely selected. Preferably, as... Figure 2 As shown, the spring 28 contacts the extension element 27 in the section near the reinforcing plate 26. Correspondingly, the aforementioned distance between the magnetic element 17 and the metal component can be maintained to avoid the spring 28 affecting the position sensor 16.

[0043] Preferably, the reed switch is configured to have a main detection area 29 and a secondary detection area 30 that is smaller than the main detection area 29, and the reed switch can be driven in the secondary detection area 30 via a magnetic element 17.

[0044] The detection area is the spatial region at the reed switch, within which the reed switch responds to the entry of magnetic element 17. For example... Figure 3 As shown, the reed switch preferably has a main detection lobe forming the main detection region 29 and a secondary detection lobe forming the secondary detection region 30. The secondary detection region 30 (here, the secondary detection lobe) has a smaller volume than the main detection region 29. This makes more accurate detection of the lock assembly position possible because the magnetic element 17 actuates the reed switch within a smaller angular range compared to the main detection region 29.

[0045] It is conceivable that the reed switch detects the position of another locking component via the main detection area 29. For example, as shown, the position of the latch 2 can be detected via the secondary detection area 30, while the position of another locking component, such as the locking pawl 3, drive chain 13, inner operating lever, outer operating lever, etc., can be detected via the main detection area 29. Although the reed switch only detects the position through its closed or open state, the position of the locking component can be distinguished by further complementary information, such as by the forced logical timing sequence of these positions or by other sensors.

[0046] As previously described, the latch 2 is preferably configured as a locking assembly detected by a reed switch. The reed switch can be actuated when the latch 2 is in at least one locked position or when the latch 2 is in an open position. Particularly preferably, the reed switch is actuated upon entering the main locked position.

[0047] Alternatively or additionally, the locking pawl 3 can be conceived as a locking assembly detected by a reed switch. Detection of the locking pawl 3 can be achieved via a magnetic element 17 disposed at the locking pawl 3. In a preferred design, the reed switch detects the position of the locking pawl 3 via a sensor lever 31 corresponding to the locking pawl 3 and having a magnetic element 17. The sensor lever 31 can also be as follows: Figure 2 The spring 28 is used to preload the locking pawl 3. Particularly preferably, the spring 28 provides preload for both the locking pawl 3 and the latch 2.

[0048] exist Figure 3 In another preferred design, two reed switches are provided for detecting the pre-locked position (VS) and the main locked position (HS) of the latch 2. Preferably, each reed switch can be driven via the same magnetic element 17 corresponding to the latch 2. Depending on the angular position of the latch 2, the magnetic element 17 can be located within the detection area of ​​the corresponding reed switch for the locked position. Preferably, when the latch 2 is in the open position, the magnetic element 17 is outside the detection area.

[0049] Preferably, the reed switch can be driven in the corresponding secondary detection area 30 via the magnetic element 17. The small size of the secondary detection area 30, especially when there is only a slight angular difference between the locking positions of the latch 2, makes it possible to distinguish the corresponding positions. Preferably, the secondary detection areas 30 of the reed switch do not overlap. Figure 3 In the diagram, the latch 2 is in the main locking position, and the magnetic element 17 is in the secondary detection area 30 of the reed switch used for the main locking position.

[0050] In one design scheme (not shown), an anti-tamper reed switch is provided near the position sensor 16. This anti-tamper reed switch is adapted to be activated when a magnetic field external to the vehicle lock 1 is applied to drive the position sensor 16.

[0051] In particular, detecting the open state of latch 2 may be relevant to the anti-theft security of motor vehicles, where the open state, for example, triggers an alarm system (provided that the alarm system was not deactivated before unlocking the vehicle lock 1). A potential challenge when using a reed switch is that the reed switch can be driven by an external magnetic field and thus tampered with, allowing the switching circuit to continue detecting the locked position of latch 2. Such tampering can be prevented by using a tamper-proof reed switch, as it is driven together with the reed switch configured as position sensor 16. The state of the tamper-proof reed switch allows for the verification of the reliability of the position detected by position sensor 16.

[0052] Particularly preferably, the magnetic element 17 is constructed as a ferrite magnet. Advantageously, in the case of using a reed switch, the use of an expensive neodymium magnet-based magnetic element 17 can be eliminated.

[0053] According to another teaching, a motor vehicle locking system is proposed, which includes the motor vehicle lock 1 proposed in this invention and a control unit connected via a plug-in element 14. A switching circuit formed by the control unit and the plug-in element 14 can be switched according to the position of the magnetic element 17 using a reed switch. Preferably, the control unit generates position information of the lock assembly via the switching circuit. All embodiments of the motor vehicle lock 1 proposed in this invention can be referred to.

[0054] According to another teaching, a method for operating a motor vehicle lock 1 is proposed, the motor vehicle lock having at least one latch 2 and a locking pawl 3 as a lock assembly. The latch 2 is capable of engaging with a locking member in at least one locked position, wherein the latch 2 releases the locking member in an open position, wherein the locking pawl 3 prevents the latch 2 from displacing to the open position in an engaged position and releases the latch 2 in a released position. A circuit board 9 having electronic components 10 is arranged within the housing of the motor vehicle lock 1, wherein a connector 14 is provided at the housing, at least a portion of the electronic components 10 being connected to an external control unit via the connector, wherein at least one position sensor 16 for the lock assembly is provided on the circuit board 9.

[0055] The position sensor 16 is configured as a reed switch, which can be driven by a magnetic element 17 corresponding to the lock assembly, and the switching circuit connected via the plug-in element 14 switches according to the position of the magnetic element 17 via the reed switch. Reference can be made to all embodiments of the proposed motor vehicle lock 1 and the proposed motor vehicle locking system.

Claims

1. A motor vehicle lock for a closing element of a motor vehicle, the motor vehicle lock (1) having at least one latch (2) and a locking pawl (3) as a lock assembly, wherein the latch (2) is capable of engaging with a locking member in at least one locked position, wherein the latch (2) releases the locking member in an open position, wherein the locking pawl (3) prevents the latch (2) from displacing to the open position in an engaged position and releases the latch (2) in a lifted position. A circuit board (9) having electronic components (10) is arranged inside the housing of the vehicle lock (1), wherein a plug-in element (14) is provided at the housing for connecting at least a portion of the electronic components (10) to an external control unit, wherein at least one position sensor (16) for the lock assembly is provided on the circuit board (9). Its features are, The position sensor (16) is configured as a reed switch, which can be driven via a magnetic element (17) corresponding to the lock assembly, and the reed switch is adapted to switch a switching circuit connected via the plug-in element (14) according to the position of the magnetic element (17).

2. A motor vehicle lock according to claim 1, characterised in that The housing is divided into a dry area (19) and a wet area (20) by a housing partition (18), the circuit board (9) having the reed switch is arranged in the dry area (19), and the lock assembly detected by the reed switch, preferably together with the magnetic element (17), is arranged in the wet area (20).

3. Motor vehicle lock according to claim 1 or 2, characterized in that The lock assembly detected by the reed switch is supported in the cross-section of the vehicle lock (1) between the locking plate (25) and the reinforcing plate (26), and the magnetic element (17) is arranged in the cross-section in the plane between the reinforcing plate (26) and the circuit board (9), particularly in the plane between the reinforcing plate (26) and the housing partition (18).

4. The vehicle lock according to claim 3, characterized in that, The lock assembly detected by the reed switch has an extension element (27) in the area between the locking plate (25) and the reinforcing plate (26), at which the magnetic element (17) is arranged. Preferably, the extension element (27) is arranged with the rest of the lock assembly in an anti-rotation manner. More preferably, the extension element (27) is arranged separately from the lock assembly or integrally with the covering layer of the lock assembly.

5. The vehicle lock according to claim 3 or 4, characterized in that, The locking assembly is pre-tightened via mechanical contact between the extension element (27) and the spring (28), preferably, the spring (28) contacts the extension element (27) in the section of the extension element (27) near the reinforcing plate (26).

6. The motor vehicle lock according to any one of the preceding claims, characterized in that, The reed switch has a main detection area (29) and a secondary detection area (30) that is smaller than the main detection area (29), and the reed switch can be driven in the secondary detection area (30) via the magnetic element (17).

7. The vehicle lock according to claim 6, characterized in that, The reed switch detects the position of another locking component via the main detection area (29).

8. The motor vehicle lock according to any one of the preceding claims, characterized in that, The latch (2) is configured as a locking assembly detected by the reed switch, and the reed switch is actuable when the latch (2) is in at least one locked position or when the latch (2) is in the open position, and / or the locking pawl (3) is configured as a locking assembly detected by the reed switch, preferably, the reed switch detects the position of the locking pawl (3) via a sensor lever (31) having the magnetic element (17) corresponding to the locking pawl (3).

9. The motor vehicle lock according to any one of the preceding claims, characterized in that, Two reed switches are provided for detecting the pre-locked position and the main locked position of the latch (2). Preferably, each of the reed switches can be driven via the same magnetic element (17) corresponding to the latch (2). More preferably, the reed switches can be driven in the corresponding sub-detection area (30) via the magnetic element (17).

10. The motor vehicle lock according to any one of the preceding claims, characterized in that, A tamper-proof reed switch is provided near the position sensor (16), and the tamper-proof reed switch is adapted to be actuated when a magnetic field is applied outside the vehicle lock (1) to drive the position sensor (16).

11. The motor vehicle lock according to any one of the preceding claims, characterized in that, The magnetic element (17) is constructed as a ferrite magnet.

12. A motor vehicle locking system having a motor vehicle lock (1) according to any one of the preceding claims and a control unit connected via the plug element (14), wherein a switching circuit formed by the control unit and the plug element (14) is switchable by means of the reed switch according to the position of the magnetic element (17).

13. A method for operating a motor vehicle lock (1), the motor vehicle lock having at least one latch (2) and a locking pawl (3) as a lock assembly, wherein the latch (2) is capable of engaging with a locking member in at least one locked position, wherein the latch (2) releases the locking member in an open position, wherein the locking pawl (3) prevents the latch (2) from displacing to the open position in an engaged position and releases the latch (2) in a lifted position. A circuit board (9) having electronic components (10) is arranged inside the housing of the vehicle lock (1), wherein a plug-in element (14) is provided at the housing, at least a portion of the electronic components (10) is connected to an external control unit via the plug-in element, wherein at least one position sensor (16) for the lock assembly is provided on the circuit board (9). Its features are, The position sensor (16) is configured as a reed switch, which can be driven via a magnetic element (17) corresponding to the lock assembly, and the switching circuit connected via the plug element (14) switches according to the position of the magnetic element (17) using the reed switch.

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