Equipment box

Abstract

The invention discloses an equipment box which comprises a box body and a box cover, a charging circuit used for charging wearable equipment is arranged in the box body, the box cover is connected with a locking part, a locking mechanism is arranged in the box body, and the locking mechanism is used for locking the locking part when the charging circuit is switched on and unlocking the locking part when the charging circuit is switched off. Thus, after the wearable device is correctly installed in the box body and the box cover is closed, the charging circuit is conducted, and the wearable device is charged; meanwhile, the locking mechanism locks the locking part on the box cover, so that the whole box cover is locked, the box cover and the box body are temporarily fixed into a whole and stably kept in a closed state, and the box cover cannot be easily opened even under the condition that the box cover is influenced by external vibration, collision and other factors or a user tries to open the box cover due to misoperation; therefore, the box cover can be prevented from being opened accidentally in the charging state, and it is ensured that the wearable device and the charging pin keep stable electric connection in the charging state.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable devices, and in particular to a device box. Background Art

[0002] With the development of wearable devices, intelligent wearable devices have been widely used.

[0003] Some wearable devices such as AR (Augmented Reality) glasses and VR (Virtual Reality) glasses have a charging function, and accordingly, a charging circuit is also configured in the device box for installing the wearable device. When the power of the wearable device is exhausted, the wearable device needs to be placed in the device box for charging. Usually, after the wearable device is correctly installed in the box body of the device box, the charging circuit can be smoothly connected, and the wearable device is charged by the built-in battery of the box body. After charging, the charging circuit is automatically disconnected. For example, after the wearable device is installed in the box body, the box cover is closed, the wearable device is pressed tightly by the box cover, and at the same time, the charging hole on the wearable device and the charging pin in the box body are connected to achieve electrical connection, and the charging circuit is turned on to ensure that the electrical connection between the charging hole and the charging pin is stable and the charging state of the wearable device is stable.

[0004] However, in the prior art, the cover of the device box can be easily opened regardless of whether the wearable device is in a charging state or in use, that is, regardless of whether the wearable device is installed in a box body. For example, the cover may be forced to open due to external vibrations, collisions, etc., or the user actively opens the cover. Once the cover is opened in the charging state, the wearable device may be unstable, which may cause the wearable device to shake or move in the box body, and the charging pin and the charging hole on the wearable device may have poor electrical connection or even short circuit and burnout.

[0005] Therefore, how to prevent the box cover from accidentally opening during charging and ensure that the wearable device and the charging pin maintain a stable electrical connection during charging is a technical problem faced by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a device box that can prevent the box cover from being accidentally opened in a charging state, thereby ensuring that a wearable device and a charging pin maintain a stable electrical connection in a charging state.

[0007] In order to solve the above technical problems, the present invention provides a device box, including a box body and a box cover, wherein a charging circuit for charging a wearable device is arranged in the box body, the box cover is connected to a locking part, and a locking mechanism is also arranged in the box body, wherein the locking mechanism is used to be connected to the locking part to lock the box cover when the charging circuit is turned on, and to be separated from the locking part to unlock the box cover when the charging circuit is disconnected.

[0008] Preferably, a mounting groove is provided in the box body, the locking mechanism is provided in the mounting groove, and when the box cover is closed, the locking portion is inserted into the mounting groove.

[0009] Preferably, the mounting groove comprises a mounting portion and a positioning portion which are connected to each other, the mounting portion is used to accommodate the locking mechanism, and the positioning portion is used to insert the locking portion.

[0010] Preferably, the notch of the mounting portion is closed, and the notch of the positioning portion is open upward.

[0011] Preferably, the locking mechanism comprises a magnet, a coil, a locking member and a reset spring, the coil is connected to the locking member and electrically connected to the charging circuit, and the reset spring is connected to the locking member;

[0012] When the charging circuit is turned on, the magnetic force between the coil and the magnet drives the locking member to move until it abuts against the locking portion;

[0013] When the charging circuit is disconnected, the reset spring drives the locking member to move to reset through elastic force.

[0014] Preferably, a locking hole is formed on the locking portion, and the locking member comprises a locking rod, and the locking rod is used to be inserted into the locking hole when the locking member moves to a preset position.

[0015] Preferably, the locking mechanism also includes a first mounting seat, and the locking member can be slidably arranged in the first mounting seat; a guide groove is opened on the inner side wall of the first mounting seat, and the locking member also includes a mounting plate, and a guide slide block is protruding from the side edge of the mounting plate, and the guide slide block is used to cooperate with the guide groove.

[0016] Preferably, a positioning hole is provided on the end wall of the first mounting seat facing the locking portion, and the locking rod is slidably inserted in the positioning hole.

[0017] Preferably, a limiting block is further provided on the inner side wall of the first mounting seat for abutting against the mounting plate to limit the maximum rebound distance of the locking member.

[0018] Preferably, the locking mechanism further comprises a second mounting seat, the magnet is arranged in the second mounting seat, and the magnet is directly opposite to the coil.

[0019] The device box provided by the present invention mainly includes a box body, a box cover, a charging circuit, a locking part and a locking mechanism. Among them, the box body and the box cover are the main structures of the device box, and the charging circuit is arranged in the box body, which is mainly used to charge the wearable device when it is turned on. The charging circuit is usually kept in a disconnected state, and the charging circuit is turned on only when the wearable device is correctly installed in the box body and the box cover is in a closed state. The locking part and the locking mechanism are core components, and the locking part is connected in the box cover and extends toward the box body to a preset position; the locking mechanism is arranged in the box body, and is mainly used to cooperate with the locking part to form a connection or disconnection with the locking part, so as to fix the box cover on the box body and keep it in a closed state, or release the fixation between the box cover and the box body so that the box cover can be opened, thereby realizing the locking and unlocking operation of the box cover. Specifically, when the charging circuit is turned on, the locking mechanism is connected to the locking part and locks the box cover on the box body; when the charging circuit is disconnected, the locking mechanism is disconnected from the locking part and unlocks the box cover from the box body. In this way, when the wearable device is correctly installed in the box body and the box cover is closed, the charging circuit of the device box provided by the present invention will be turned on and the wearable device will start to be charged; at the same time, the locking mechanism is connected to the locking part in the box cover, and the entire box cover is locked on the box body, so that the box cover and the box body are temporarily connected as one and stably maintain a closed state. Even if affected by external vibrations, collisions and other factors or the user attempts to open the box cover by mistake, the box cover cannot be easily opened, so it can prevent the box cover from accidentally opening in the charging state, ensuring that the wearable device and the charging pin maintain a stable electrical connection in the charging state. Of course, after the wearable device is charged or the charging operation is stopped by the control instruction, the charging circuit is disconnected, the locking mechanism is disconnected from the locking part, and the box cover is unlocked. At this time, the box cover can be opened normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a structural schematic diagram of a box cover in a closed state in a specific implementation manner provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the specific structure of the box body.

[0023] Figure 3 for Figure 1 A cross-sectional schematic diagram of the structure shown at the mounting groove position.

[0024] Figure 4 for Figure 3 An enlarged view of the structure of frame A shown in FIG.

[0025] Figure 5 It is a cross-sectional view of the overall structure of the locking mechanism.

[0026] Figure 6 for Figure 5 Exploded diagram.

[0027] Figure 7 The exploded diagram of the overall structure of the locking mechanism.

[0028] in, Figure 1 — Figure 7 middle:

[0029] Box body—1, box cover—2, locking mechanism—3;

[0030] Mounting groove—11, boss—12;

[0031] Locking portion—21, locking hole—22;

[0032] Magnet—31, coil—32, locking member—33, return spring—34, first mounting seat—35, second mounting seat—36;

[0033] Mounting portion—111, positioning portion—112;

[0034] Locking rod—331, mounting plate—332, guide slide block—333;

[0035] Guide groove—351, positioning socket—352, limit block—353. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a specific implementation manner provided by the present invention in which the box cover 2 is in a closed state.

[0038] In a specific implementation manner provided by the present invention, the device box mainly includes a box body 1 , a box cover 2 , a charging circuit, a locking portion 21 and a locking mechanism 3 .

[0039] Among them, the box body 1 and the box cover 2 are the main structures of the device box. The charging circuit is arranged in the box body 1, which is mainly used to charge the wearable device when it is turned on. The charging circuit is usually kept disconnected. The charging circuit is only turned on when the wearable device is correctly installed in the box body 1 and the box cover 2 is in the closed state.

[0040] The locking part 21 and the locking mechanism 3 are core components. The locking part 21 is connected inside the box cover 2 and extends toward the box body 1 to a preset position. The locking mechanism 3 is arranged inside the box body 1 and is mainly used to cooperate with the locking part 21 to connect or disconnect with the locking part 21, thereby fixing the box cover 2 on the box body 1 and keeping it in a closed state, or releasing the fixation between the box cover 2 and the box body 1 so that the box cover 2 can be opened, thereby realizing the locking and unlocking operation of the box cover 2. Specifically, when the charging circuit is turned on, the locking mechanism 3 is connected with the locking part 21 and locks the box cover 2 on the box body 1; when the charging circuit is disconnected, the locking mechanism 3 is disconnected from the locking part 21 and unlocks the box cover 2 from the box body 1.

[0041] In this way, in the device box provided in this embodiment, when the wearable device is correctly installed in the box body 1 and the box cover 2 is closed, the charging circuit will be turned on and the wearable device will start to be charged; at the same time, the locking mechanism 3 is connected to the locking part 21 in the box cover 2, and the entire box cover 2 is locked on the box body 1, so that the box cover 2 and the box body 1 are temporarily connected as a whole and stably maintain a closed state. Even if affected by external vibrations, collisions and other factors or the user attempts to open the box cover 2 by mistake, the box cover 2 cannot be easily opened, so it can prevent the box cover 2 from accidentally opening in the charging state, ensuring that the wearable device and the charging pin maintain a stable electrical connection in the charging state. Of course, after the wearable device is charged or the charging operation is stopped by the control instruction (such as triggered by a manual operation control button), the charging circuit is disconnected, the locking mechanism 3 is disconnected from the locking part 21, and the box cover 2 is unlocked. At this time, the box cover 2 can be opened normally.

[0042] like Figure 2 As shown, Figure 2 It is a schematic diagram of the specific structure of the box body 1.

[0043] In order to facilitate installation of the locking mechanism 3 in the box body 1, the present embodiment provides an installation groove 11 in the box body 1, so that the locking mechanism 3 is arranged in the installation groove 11. At the same time, in order to facilitate connection between the locking mechanism 3 and the locking portion 21, when the box cover 2 is closed, the locking portion 21 is also inserted into the installation groove 11, so that the locking portion 21 and the locking mechanism 3 are close to each other.

[0044] Furthermore, in order to facilitate the opening of the installation groove 11, a boss 12 is provided in the box body 1 in this embodiment. Specifically, the boss 12 is provided on one inner wall of the box body 1, and the installation groove 11 is provided on the surface of the boss 12. Accordingly, the locking portion 21 is specifically connected to the inner wall of the corresponding side of the box cover 2, so that when the box cover 2 is closed, it moves toward the boss 12 and is inserted into the installation groove 11. For example, when the box cover 2 is buckled on the box body 1, the locking portion 21 can be inserted vertically downward into the installation groove 11.

[0045] like Figure 3 , Figure 4 As shown, Figure 3 for Figure 1 The structure shown is a cross-sectional schematic diagram at the location of the mounting groove 11, Figure 4 for Figure 3 An enlarged view of the structure of frame A shown in FIG.

[0046] In an optional embodiment of the installation groove 11, the installation groove 11 mainly includes an installation portion 111 and a positioning portion 112. The installation portion 111 is mainly used to accommodate and install the locking mechanism 3, while the positioning portion 112 is mainly used to cooperate with the locking portion 21, so that the locking portion 21 can be inserted when the box cover 2 is closed, and the positioning portion 112 and the box cover 2 can be installed and positioned. In addition, the installation portion 111 and the positioning portion 112 are interconnected, that is, the inner space of the installation groove 11 is connected as a whole, and the two can be located at both ends of the length direction of the installation groove 11, so that it is convenient for the locking mechanism 3 to perform the action connected with the locking portion 21, and avoids the formation of obstacles to the execution of the locking mechanism 3.

[0047] Furthermore, in order to achieve a sealed installation of the locking mechanism 3 and prevent the external environment from interfering with the execution of the locking mechanism 3, in this embodiment, the notch of the mounting portion 111 of the mounting slot 11 is sealed to protect and shield the locking mechanism 3. At the same time, the notch of the positioning portion 112 of the mounting slot 11 is open upward to facilitate the insertion and removal of the locking portion 21.

[0048] like Figure 5 , Figure 6 , Figure 7 As shown, Figure 5 is a cross-sectional view of the overall structure of the locking mechanism 3, Figure 6 for Figure 5 Exploded diagram of Figure 7 It is an exploded view of the overall structure of the locking mechanism 3.

[0049] In an optional embodiment of the locking mechanism 3 , the locking mechanism 3 mainly includes a magnet 31 , a coil 32 , a locking member 33 and a return spring 34 .

[0050] The magnet 31 is installed in the shell and is fixedly connected to the shell, for example, it can be installed at one end of the mounting portion 111 of the mounting slot 11. The magnet 31 can be a magnetic material with a magnetic field, such as a permanent magnet 31, specifically a ferrite magnet, a neodymium magnet, etc.; it can also be a soft magnet 31, such as an electromagnet, etc. When the magnet 31 is a soft magnet 31, it is necessary to generate a magnetic field around the soft magnet 31 when the charging circuit is turned on, so as to interact with the induced magnetic field generated by the coil 32 to form a magnetic force between the two.

[0051] The coil 32 is electrically connected to the charging circuit. When the charging circuit is turned on, current flows through the coil 32. Conversely, when the charging circuit is disconnected, no current flows through the coil 32. At the same time, the coil 32 is connected to the locking member 33, and is generally fixedly connected to the locking member 33. Due to the principle of electromagnetic induction, when current flows through the coil 32, an induced magnetic field will be formed around the coil 32, and then a magnetic force, such as magnetic repulsion or magnetic attraction, will be formed between the coil 32 and the magnet 31. The following content of this embodiment takes the magnetic repulsion formed between the coil 32 and the magnet 31 as an example to illustrate the execution action of the locking mechanism 3, but the situation in which a magnetic attraction is formed between the coil 32 and the magnet 31 is obviously foreseeable to those skilled in the art.

[0052] The locking member 33 is the actuator of the locking mechanism 3. Since the coil 32 is connected to the locking member 33, the magnetic force between the coil 32 and the magnet 31 will be transmitted to the locking member 33, driving the locking member 33 to move, such as sliding linearly along the length direction in the mounting groove 11. Specifically, when the charging circuit is turned on, the locking member 33 will move under the action of the magnetic force until it forms a tight contact with the locking portion 21, thereby pressing and fixing the locking portion 21, such as pressing the locking portion 21 in the positioning portion 112 of the mounting groove 11, thereby locking the locking portion 21 in the mounting groove 11, so that the locking portion 21 cannot be pulled out of the mounting groove 11, thereby ensuring that the box cover 2 cannot be opened.

[0053] One end of the return spring 34 is connected to the locking piece 33, and the other end is generally connected to the mounting groove 11. When the locking piece 33 is driven by the magnetic force to move in a directional manner to compress the locking portion 21, the return spring 34 is compressed or stretched; and when the magnetic force disappears, the return spring 34 produces elastic deformation and returns to its initial state. At this time, the locking piece 33 is driven by the elastic force to move in the opposite direction until it is reset, so that the locking piece 33 is relaxed and disengaged from the locking portion 21, the box cover 2 is unlocked, and the box cover 2 can be opened normally.

[0054] Thus, in the locking mechanism 3 of this embodiment, when the charging circuit is turned on, current flows through the coil 32 and generates an induced magnetic field, which interacts with the magnetic field of the magnet 31, thereby forming a magnetic force between the coil 32 and the magnet 31, and using the magnetic force to drive the locking member 33 to perform directional movement, so that the locking member 33 abuts against and presses the locking portion 21 of the box cover 2, thereby locking the box cover 2. Of course, when the charging circuit is disconnected, the current in the coil 32 disappears, and then the magnetic force disappears, and the locking member 33 moves in the opposite direction to reset under the elastic force of the reset spring 34, the locking portion 21 is released, and the box cover 2 is unlocked.

[0055] Furthermore, in order to increase the locking force of the locking portion 21 and improve the reliability of the locking mechanism 3, a locking hole 22 is provided on the locking portion 21 in this embodiment, and the locking member 33 mainly includes a locking rod 331. Specifically, when the locking portion 21 is inserted into the mounting groove 11, the locking hole 22 will be aligned with the locking rod 331 of the locking member 33, so that when the locking member 33 is driven by the magnetic force and moves toward the locking portion 21, the locking rod 331 will be inserted into the locking hole 22 to form a locking pin structure. In this way, the locking force of the locking portion 21 can be enhanced by the cooperation between the locking rod 331 and the locking hole 22, compared with the locking of the locking rod 331 against the surface of the locking portion 21, thereby improving the reliability of the locking mechanism 3.

[0056] In order to enable the locking member 33 to move under the magnetic force, the locking rod 331 can be accurately inserted into the locking hole 22, a first mounting seat 35 is added in this embodiment, and a guide slot 351 is provided on the first mounting seat 35. Specifically, the first mounting seat 35 is mainly used to install the locking member 33, and the reset spring 34 can also be installed at the same time, and is generally arranged at the other end of the mounting portion 111 of the mounting groove 11. The guide slot 351 is provided on the inner side wall of the first mounting seat 35, and can be provided only on one side wall, or on both sides of the inner wall. Accordingly, the locking member 33 is provided inside the first mounting seat 35, and can move inside the first mounting seat 35, and the locking member 33 includes not only the locking rod 331, but also a mounting plate 332, and the locking rod 331 is connected to the mounting plate 332. A guide slider 333 is protruding on the side of the mounting plate 332. The guide slider 333 is mainly used to cooperate with the guide groove 351 on the first mounting seat 35, so that after the locking piece 33 is installed in the first mounting seat 35, the guide slider 333 is simultaneously inserted into the guide groove 351 to form a sliding connection, thereby forming a movement guiding effect on the locking piece 33 when the locking piece 33 is driven by magnetic force to move.

[0057] Furthermore, in order to improve the movement accuracy of the locking rod 331 and strengthen the guiding effect on the locking member 33, the present embodiment further provides a positioning socket 352 in the first mounting seat 35. Specifically, the positioning socket 352 is provided on the end wall of the first mounting seat 35, and the end wall is connected between the two inner side walls provided with the guiding slot 351, and faces the locking portion 21 or the positioning portion 112 of the mounting slot 11. The locking rod 331 is inserted into the positioning socket 352 and forms a sliding connection, and can move axially along the axial direction of the positioning socket 352. The positioning socket 352 has a sufficient length so that the locking member 331 is always inserted into the positioning socket 352 and will not fall out, whether it is driven by magnetic force to move forward or reversely by the elastic force of the reset spring 34.

[0058] In addition, considering that when the current in the coil 32 disappears, the reset spring 34 will rebound instantly, and the impulse generated on the locking member 33 will cause the locking member 33 to continue to move after the reverse movement to reset, thereby exceeding the initial position and moving toward the magnet 31. In order to prevent the locking member 33 from rebounding too far and being attracted by the magnet 31, the present embodiment further provides a limit block 353 on the inner side wall of the first mounting seat 35. Specifically, the limit block 353 is mainly used to form abutment with the mounting plate 332 of the locking member 33, so as to limit the maximum rebound distance of the locking member 33 when the locking member 33 rebounds, and avoid being too close to the magnet 31.

[0059] In order to facilitate the installation of the magnet 31, the present embodiment further provides a second mounting seat 36 in the locking mechanism 3. Specifically, the second mounting seat 36 is provided at one end of the mounting groove 11, and can be sealed or open, and the magnet 31 is provided in the second mounting seat 36 and maintains a positive state with the coil 32, so as to facilitate the generation of magnetic force. At the same time, the cross-sectional dimensions of the second mounting seat 36 and the second mounting seat 36 can be the same, so that the end walls of the two can be closely attached to each other, thereby being spliced ​​into one body, such as being fixed by welding, etc., so as to facilitate disassembly and assembly in the mounting groove 11.

[0060] In another optional embodiment of the locking mechanism 3, the locking mechanism 3 may also use a drive cylinder, etc., to utilize the telescopic movement of the piston rod to achieve the locking and unlocking operation of the locking portion 21. For example, when the charging circuit is turned on, the drive cylinder receives a corresponding control signal to extend the piston rod until the locking portion 21 is locked; when the charging circuit is disconnected, the piston rod automatically retracts to unlock the locking portion 21.

[0061] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device box, comprising a box body (1) and a box cover (2), wherein a charging circuit for charging a wearable device is arranged in the box body (1), characterized in that: A locking portion (21) is connected to the box cover (2), and a locking mechanism (3) is also provided in the box body (1). The locking mechanism (3) is used to connect with the locking portion (21) to lock the box cover (2) when the charging circuit is turned on, and to separate from the locking portion (21) to unlock the box cover (2) when the charging circuit is turned off.

2. The device box according to claim 1, characterized in that: The box body (1) is provided with a mounting groove (11), the locking mechanism (3) is arranged in the mounting groove (11), and when the box cover (2) is closed, the locking portion (21) is inserted into the mounting groove (11).

3. The device box according to claim 2, characterized in that: The mounting groove (11) comprises a mounting portion (111) and a positioning portion (112) which are connected to each other; the mounting portion (111) is used to accommodate the locking mechanism (3); and the positioning portion (112) is used to insert the locking portion (21).

4. The device box according to claim 3, characterized in that: The notch of the mounting portion (111) is sealed, and the notch of the positioning portion (112) is open upward.

5. The device box according to any one of claims 1 to 4, characterized in that: The locking mechanism (3) comprises a magnet (31), a coil (32), a locking piece (33) and a return spring (34); the coil (32) is connected to the locking piece (33) and is electrically connected to the charging circuit; the return spring (34) is connected to the locking piece (33); When the charging circuit is turned on, the magnetic force between the coil (32) and the magnet (31) drives the locking member (33) to move until it abuts against the locking portion (21); When the charging circuit is disconnected, the reset spring (34) drives the locking member (33) to move to reset through elastic force.

6. The device box according to claim 5, characterized in that: The locking portion (21) is provided with a locking hole (22), and the locking member (33) comprises a locking rod (331), and the locking rod (331) is used to be inserted into the locking hole (22) when the locking member (33) moves to a preset position.

7. The device box according to claim 6, characterized in that: The locking mechanism (3) further comprises a first mounting seat (35), and the locking member (33) is slidably arranged in the first mounting seat (35); a guide slide groove (351) is provided on the inner side wall of the first mounting seat (35), and the locking member (33) further comprises a mounting plate (332), and a guide slide block (333) is protruding from the side edge of the mounting plate (332), and the guide slide block (333) is used to cooperate with the guide slide groove (351).

8. The device box according to claim 7, characterized in that: A positioning insertion hole (352) is provided on the end wall of the first mounting seat (35) facing the locking portion (21), and the locking rod (331) is slidably inserted into the positioning insertion hole (352).

9. The device box according to claim 7, characterized in that: A limiting block (353) is also provided on the inner side wall of the first mounting seat (35) for abutting against the mounting plate (332) to limit the maximum rebound distance of the locking member (33).

10. The device box according to claim 5, characterized in that: The locking mechanism (3) further comprises a second mounting seat (36), the magnet (31) being arranged in the second mounting seat (36), and the magnet (31) being directly opposite to the coil (32).

Images