WO2023126002A1

WO2023126002A1 - Electrical device and actuator for tact switch

Info

Publication number: WO2023126002A1
Application number: PCT/CN2022/144323
Authority: WO
Inventors: 吴土明
Original assignee: 施耐德电气工业公司; 吴土明
Priority date: 2021-12-31
Filing date: 2022-12-30
Publication date: 2023-07-06
Also published as: AU2022425396A1; CN216818186U

Abstract

The present disclosure relates to an electrical device and an actuator for a tact switch. The electrical device comprises: a housing (10); a tact switch, capable of being pressed to switch on a circuit loop in the electrical device and being released to switch off the circuit loop; and an actuator (40), mounted in the housing (10) and movable between a first position (P1) and a second position (P2) to selectively arrange the tact switch in an ON state or an OFF state. At the first position (P1), the actuator (40) presses the tact switch such that the tact switch is in an ON state, and at the second position (P2), the actuator (40) is separated from the tact switch such that the tact switch is in an OFF state. The electrical device according to the embodiments of the present disclosure is convenient for user operation.

Description

Electrical equipment and actuators for tact switches

technical field

Embodiments of the present disclosure generally relate to an electrical device including a tact switch, and more particularly to an actuator for a tact switch.

Background technique

Electrical devices such as smoke alarms are often provided with tact switches. A tact switch refers to a switch that is pressed to connect an electrical circuit and disconnects the electrical circuit after the pressing force is released (that is, after it is released). This requires that the electrical equipment including the tact switch must be kept in a pressed state in order to achieve access, which is very inconvenient in practical applications. It is desirable to improve the convenience of use of electrical equipment including tact switches.

Contents of the invention

Embodiments of the present disclosure provide an electrical device and an actuator for a tact switch, aiming to address one or more of the above-mentioned problems as well as other potential problems.

According to a first aspect of the present disclosure, an electrical device is provided. The electrical device includes: a housing; a tact switch capable of being pressed to close an electrical circuit in the electrical device and released to break the electrical circuit; and an actuator mounted in the housing and is movable between a first position and a second position in which the actuator depresses the tact switch to selectively place the tact switch in an on state or an off state. touch the switch so that the tact switch is in the on state, and at the second position, the actuator is separated from the tact switch so that the tact switch is in the off state.

According to the electrical equipment of the embodiments of the present disclosure, the state of the tact switch can be conveniently selected via the actuator, which improves the application convenience and user-friendliness of the electrical equipment.

In some embodiments, the housing may include an opening passing through in a pressing direction, wherein the actuator is rotatably installed in the opening in an embedded manner.

In some embodiments, the actuator is rotatably arranged relative to the housing, wherein the actuator is at different circumferences relative to the housing in the first position and the second position. to the location.

In some embodiments, the actuator may include a trigger end that can be rotated to change the position of the actuator and an actuation end opposite the trigger end, the actuation end being adapted to to press the tact switch.

In some embodiments, the trigger end may further include a toggle portion protruding radially outward from the main body of the trigger end, by rotating the toggle portion so that the actuator is in the first position and between the second positions.

In some embodiments, the actuator may be mounted eccentrically with respect to a mounting axis of the electrical device.

In some embodiments, the toggle may protrude further toward the mounting axis at the first position than at the second position.

In some embodiments, the electrical equipment may further include a mounting plate adapted to be fixed to a fixed body, the housing is rotatably mounted relative to the mounting plate, wherein the mounting plate includes a push portion, so that the During the process of the housing being rotatably mounted on the mounting plate, the pushing part is pushed through the pushing part to move the actuator from the first position to the second position.

In some embodiments, the mounting plate may include protruding ribs on the side facing the housing, and when the housing is attached to the mounting plate, the protruding ribs can press the actuator to keep the tact switch on.

In some embodiments, the trigger end may also include a tool slot.

In some embodiments, the actuating end may include a positioning arm projecting radially outward from the body of the triggering end, the housing including a circumferential channel providing a path of movement for the positioning arm.

In some embodiments, the circumferential channel may include a first detent portion and a second detent portion adapted to position the positioning arm at different heights, wherein the first detent portion and the second detent portion The positions of the two locking parts respectively correspond to the first position and the second position of the actuator.

In some embodiments, the circumferential channel may be formed on a barrel extending protrudingly from the housing, the barrel including an inclined wall providing a trajectory for movement of the positioning arm.

In some embodiments, the actuator may include detents to removably mount the actuator into the housing.

In some embodiments, the actuator may be a one-piece molding.

In some embodiments, the electrical device may include a smoke alarm.

According to a first aspect of the present disclosure, there is provided an actuator for a tact switch capable of being pressed to close an electrical circuit in the electrical device and released to break the electrical circuit. circuit. The actuator includes: a cylindrical body including a first end and an opposite second end; a dial projecting radially outward from the body at the first end, by rotating the dial to cause the actuator to rotate from between a first position and a second position, wherein at the first position, the body is adapted to contact the tact switch such that the tact switch is in an on state , at the second position, the main body is adapted to leave a distance from the tact switch, so that the tact switch is in an off state; and at the second end, the main body from the trigger end A radially outwardly protruding positioning arm provides positioning of the actuator in a pressing direction.

Description of drawings

The above and other objects, features and advantages of embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are shown by way of example and not limitation.

Fig. 1 shows a schematic perspective view of a smoke alarm viewed from a working side according to an embodiment of the present disclosure.

Fig. 2 shows a schematic perspective view of a smoke alarm viewed from an installation side according to an embodiment of the present disclosure.

FIG. 3 shows an exploded schematic view of the smoke alarm shown in FIG. 2 .

Fig. 4 shows a perspective schematic diagram of a mounting plate according to an embodiment of the present disclosure.

FIG. 5 shows a schematic perspective view of an actuator according to an embodiment of the disclosure.

Fig. 6 shows a perspective view of an actuator according to an embodiment of the present disclosure viewed from another angle.

FIG. 7 shows a schematic view from one side of an actuator in an off position according to an embodiment of the disclosure.

Figure 8 shows a schematic view from the other side of the actuator in the off position according to an embodiment of the disclosure.

Figure 9 shows a schematic view from one side of the actuator in the on position according to an embodiment of the disclosure.

Figure 10 shows a schematic view from the other side of the actuator in the on position according to an embodiment of the disclosure.

In the respective drawings, the same or corresponding reference numerals denote the same or corresponding parts.

Detailed ways

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As used herein, the term "comprise" and its variants mean open inclusion, ie "including but not limited to". The term "or" means "and/or" unless otherwise stated. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one further embodiment". The terms "upper", "lower", "front", "rear" and other words indicating placement or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the principles of the present disclosure, rather than indicating or implying References to elements must have a particular orientation, be constructed, or operate in a particular orientation, and thus should not be construed as limiting the disclosure.

The working principle of the electrical equipment including the tact switch according to the present disclosure will be described below by taking a smoke alarm as an example of the electrical equipment. It is worth noting that this is exemplary only; the inventive concepts according to the present disclosure can be applied to any other electrical devices including tact switches.

1-3 respectively show perspective schematic diagrams of a smoke alarm 100 according to an embodiment of the present disclosure. As shown in FIGS. 1-3 , the smoke alarm 100 may include a device body 50 , and a sensor, a power supply module and an alarm module may be accommodated in the device body. The device main body 50 can be installed to a proper position of the building through the mounting plate 20, such as the ceiling, wall or supporting column of the building. The device body 50 may include a fixedly arranged housing 10 which may, for example, be formed in the form of a plate and adapted to cover electrical devices within the device body 50 .

As shown in FIG. 3 , the device body 50 of the smoke alarm 100 may further accommodate a light touch switch (not shown in the figure). The actuator 40 may be installed above the tact switch and be movable up and down relative to the tact switch. When the actuator 40 moves downward to press the tact switch, the tact switch is pressed to connect the electrical circuit in the smoke alarm 100 . When the actuator 40 moves upward to release the tact switch, the contact switch is released to disconnect the electrical circuit.

As shown, the actuator 40 is mounted in the housing 10 and is movable between a first position P1 and a second position P2 to selectively place the tact switch in an on state or an off state, wherein At the first position P1, the actuator 40 presses the tact switch so that the tact switch is in the on state, and at the second position P2, the actuator 40 is separated from the tact switch, so that the tact switch is in the off state. open state.

According to the smoke alarm 100 of the embodiment of the present disclosure, through the additionally provided actuator 40, the tact switch can be conveniently and selectively arranged in the on state or the off state by moving the position of the actuator 40, while There is no need for the user to always press the trigger switch with one hand. As a result, the user's hands can be freed, which has significant benefits in practice.

In some applications, the smoke alarm 100 can also be provided with a networking module 60 . In order to realize the connection of the networking module 60 , the tact switch needs to be in the on state, so the user needs to keep pressing the tact switch and at the same time operate the networking module; this is very inconvenient in practice. According to the smoke alarm 100 of the embodiment of the present disclosure, the user can selectively arrange the tact switch in the ON state, and then operate the networking module 60 to realize network interconnection. After the interconnection of the networking modules 60 is completed, the smoke alarm 100 can be installed to, for example, the ceiling via the installation plate 20 .

In some embodiments, as shown in FIG. 3 , the housing 10 includes an opening extending therethrough along the pressing direction. The actuator 40 is rotatably mounted in the opening in an embedded manner. With the embedded installed actuator 40 , the actuator only occupies a small space, so the arrangement of the actuator does not affect the operation of other components of the smoke alarm 100 .

In some embodiments, as shown in FIG. 3 , the actuator 40 is rotatably arranged relative to the housing 10 . At the first position P1 and the second position P2 the actuator 40 is in different circumferential positions relative to the housing 10 . With this configuration, the user only needs to rotate the actuator 40 to achieve state control of the trigger switch.

FIG. 4 shows structural details of the mounting plate 20 according to an embodiment of the present disclosure. As shown in FIG. 4 , the mounting plate 20 includes a protruding rib 24 on the side facing the housing 10. When the housing 10 is attached to the mounting plate 20, the protruding rib 24 can press the actuator 40 to make a light touch. The switch remains on.

The mounting plate 20 can be mounted with the device body 50 in various ways. In some embodiments, the device body 50 is rotatably mounted relative to the mounting plate 20 . This method is easy to operate. In some embodiments, the mounting plate 20 may include a push portion 22 . During the process that the device main body 50 is rotatably mounted on the mounting plate 20, the actuator 40 is pushed through the pushing part 22 (for example, the toggle part 42 can be pushed) to move the actuator 40 from the first position P1 to the second position. P2. Thus, regardless of the initial state of the actuator 40 , the actuator 40 can always be switched to the second position P2 during the apparatus main body 50 being rotatably mounted to the mounting plate 20 by a simple mounting manner. In the state where the second position P2 corresponds to the OFF position of the tact switch, when the device body 50 is detached from the mounting plate 20, the tact switch remains in the OFF state, which can make the device in the device body 50 always It can be kept in a power-off state, which improves safety.

5 and 6 illustrate structural details of an actuator according to an embodiment of the disclosure. As shown in FIGS. 5 and 6 , the actuator 40 includes a trigger end and an actuation end opposite to the trigger end. The trigger end can be rotated to change the position of the actuator 40 . The actuation end is suitable for pressing the tact switch. When the electronic equipment in the main body 50 of the smoke alarm is installed, the state switching of the light touch switch can be realized conveniently by operating the trigger end of the actuator 40 .

In some embodiments, the trigger end also includes a tool slot 48 . A user may conveniently rotate the trigger end using a tool such as a screwdriver to engage the tool slot 48 . It should be noted that although in the illustrated embodiment the tool slot 48 is shown as being cross-shaped, any other suitable shape is applicable to the present disclosure.

In some embodiments, the trigger end may further include a toggle portion 42 protruding radially outward from the main body 45 of the trigger end, by rotating the toggle portion 42 so that the actuator 40 is between the first position P1 and the second position P2 to move between. In the case where the dial 42 is provided, besides the convenience of rotation, this has a significant benefit in the case of mounting the device body 50 with the mounting plate 20 together. The toggle may be positioned at a location suitable for interacting with the mounting plate 20 . Thus, no matter what the initial state of the toggle part 42 is, in the process of installing the device body 50 and the installation plate 20 together, the toggle part can be kept at a predetermined position through the interaction between the toggle part and the installation plate 20 . The directional position, and thus after the device main body 50 is fixed to the mounting plate 20, the tact switch is always kept in a predetermined ON/OFF state.

In some embodiments, the actuator 40 is mounted eccentrically with respect to the mounting axis of the smoke alarm 100 . In this case, in the process of installing the device main body 50 and the installation board 20 together, the position adjustment of the dial part can be realized by hitting the dial part, and then after the device body 50 is fixed to the installation board 20, The tact switch always remains in the predetermined ON/OFF state.

In some embodiments, the toggle portion 42 protrudes further toward the installation axis at the first position P1 than at the second position P2. Thus, relative to the installation axis, the toggle portion 42 protrudes more towards the installation axis at the first position P1 than at the second position P2. Therefore, during the installation of the device main body 50 on the mounting plate 20, the toggle part 42 at the second position P2 is located on the rotation path of the push part 22, and then pushed by the push part 22; The toggle part 42 at the position P1 is, for example, located outside the rotation path of the push part 22 and will not interfere with the relative rotation of the device main body 50 and the mounting plate 20 .

As shown in Figures 5 and 6, the actuation end of the actuator 40 includes a positioning arm 44 projecting radially outward from a body 45 of the trigger end. The actuator may be held in a predetermined circumferential position by interacting with the housing 10 via a positioning arm 44 .

Correspondingly, the housing 10 may include a circumferential channel providing a path of movement for the positioning arm 44 . The circumferential channel can be formed in various forms. In the illustrated embodiment, the housing 10 may include a barrel 65 extending protrudingly from the housing face in the pressing direction. The circumferential channel may include a first detent 64 and a second detent 66 adapted to position the positioning arm 44 at different heights. The positions of the first locking part and the second locking part correspond to the first position P1 and the second position P2 of the actuator 40 respectively. The first locking portion 64 and the second locking portion 66 can be formed in the shape of a recess, and the positioning arm 44 can be formed in a shape of a recess suitable for engaging with the first locking portion 64 and the second locking portion 66 respectively.

In the illustrated embodiment, the barrel 65 includes a sloped wall 62 that provides a path of travel for the positioning arm 44 . Thereby, a height difference can be provided by the inclined wall, which can correspond, for example, to the displacement stroke for triggering the actuation of the tact switch. In some embodiments, the sloped walls may be formed as smooth transitions. In other embodiments, the inclined wall may be formed in the form of a plurality of steps.

In the illustrated embodiment, the actuator 40 may be an integrally formed piece. The actuation end of the actuator 40 may be realized as a large diameter portion, and the trigger end of the actuator may be realized as a small diameter portion. This facilitates the placement of the actuator in the housing 10 . In some embodiments, the actuator 40 may include a plurality of claws 46 , and the actuator 40 may be detachably installed into the housing 10 through elastic deformation of the claws.

In some embodiments, the device body 50 is bidirectionally mountable with the mounting plate 20 . In some embodiments, the device body 50 can be mounted to the mounting plate 20 in a clockwise direction or in a counterclockwise direction. In this case, the actuator 40 may comprise a pair of positioning arms 44 arranged rotationally symmetrically. The housing 10 may comprise a radially symmetrical corresponding structure adapted to interact with the actuator 40 .

The operation principle of the actuator according to the embodiment of the present disclosure will be described below with reference to FIGS. 7-10 . As shown in FIGS. 7 and 9 , when the device body 50 is not mounted on the mounting plate, the user can operate the tool slot 50 with a tool such as a screwdriver to rotate the actuator 40 so that the actuator 40 is in a predetermined orientation. Alternatively, the user may rotate the actuator 40 by operating the toggle 42 so that the actuator 40 is in a predetermined orientation.

In the state shown in FIGS. 7 and 8 , the actuator 40 is shown in an OFF state. As shown in Figures 7 and 8, when the toggle part 42 is at the second position P2, the positioning arm 44 is at the second locking part 66 of the circumferential channel, and at the second locking part 66, the positioning arm 44 is opposite to Since the barrel 65 of the housing is at a low position, the tact switch under the actuator cannot be pressed, and the tact switch remains in the OFF state.

In the states shown in FIGS. 9 and 10 , the actuator 40 is shown in the ON state. As shown in FIGS. 9 and 10 , when the toggle portion 42 is at the first position P1, the positioning arm 44 is at the first locking portion 64 of the circumferential channel, and at the first locking portion 64, the positioning arm 44 is opposite to The barrel 65 of the housing is at a high position, thereby pressing the tact switch located below the actuator, and the tact switch remains pressed and is in the ON state.

On the one hand, when the user needs to install the device main body 50 to the mounting plate 20, it is assumed that the toggle part 42 is initially in the second position P2 and the tact switch remains released and is in the OFF state, as shown in FIGS. 7 and 8 . Show. When the device main body 50 rotates relative to the mounting plate 20, along with the relative rotation between the two, the toggle part 42 is at the second position P2 and is located outside the rotation path of the push part 22, so the toggle part 42 does not Affected by the installation action. After the mounting plate 20 and device body 50 are in place, pressing the actuating end via the protruding rib 24 on the mounting plate holds the tact switch in the ON state. When the user needs to detach the device body 50 from the mounting plate 20, the actuator remains in the second position P2, so the device body 50 is not powered.

On the other hand, when the user needs to install the device main body 50 to the mounting plate 20, it is assumed that the toggle part 42 is initially in the first position P1 and the tact switch remains pressed and is in the ON state, as shown in Figures 9 and 10 shown. When the device main body 50 rotates relative to the mounting plate 20, along with the relative rotation between the two, the pushing portion 22 of the mounting plate 20 will push the toggle portion 42 to move the toggle portion 42 from the first position P1 to the second position. Position P2, whereby the tact switch is switched to the OFF state. After the mounting plate 20 and device body 50 are in place, pressing the actuating end via the protruding rib 24 on the mounting plate holds the tact switch in the ON state. When the user needs to detach the device body 50 from the mounting plate 20, the actuator remains in the second position P2, thus ensuring that the device body 50 is not charged.

According to the second aspect of the present disclosure, an actuator 40 for a tact switch is also provided. The tact switch can be pressed to connect the electrical circuit in the smoke alarm 100 and released to disconnect the electrical circuit. The actuator includes: a cylindrical body 45 including a first end and an opposite second end; A toggle portion 42 protruding radially outward from the main body 45 at one end, by rotating the toggle portion 42, the actuator 40 is rotated from between a first position P1 and a second position P2, wherein in the first position P1 At the position, the main body 45 is adapted to contact the tact switch so that the tact switch is in the ON state, and at the second position P2, the main body 45 is adapted to leave a distance from the tact switch so that the tact switch is in the OFF state; and A positioning arm 44 protruding radially outward from the main body 45 of the trigger end at the second end, the positioning arm 44 provides positioning of the actuator 40 in the direction of depression.

It is worth noting that the above description is only exemplary for understanding the inventive concept according to the present disclosure. In other embodiments, the above arrangement can be reversed. For example, in other embodiments, at the above-mentioned first position P1, the tact switch can correspond to the OFF position, and at the above-mentioned second position P2, the tact switch can correspond to the ON position; only need to adjust the tilt adaptively The height difference at the wall 62 is sufficient.

According to the actuator of the embodiment of the present disclosure, the state control of the tact switch is realized with a simple structure in a small space.

In addition, while operations are depicted in a particular order, this should be understood to require that such operations be performed in the particular order shown, or in sequential order, or that all illustrated operations should be performed to achieve desirable results. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while the above discussion contains several specific implementation details, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Having described various embodiments of the present disclosure above, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principle of each embodiment, practical application or technical improvement in the market, or to enable other ordinary skilled in the art to understand each embodiment disclosed herein.

Claims

An electrical device comprising:

shell (10);

a tact switch depressible to close an electrical circuit in the electrical device and released to break the electrical circuit; and

An actuator (40) mounted in the housing (10) and movable between a first position (P1) and a second position (P2) to selectively place the tact switch in contact with On state or off state, wherein in the first position (P1), the actuator (40) presses the tact switch so that the tact switch is in the on state, in the second position At position (P2), the actuator (40) is separated from the tact switch, so that the tact switch is in an off state.
The electric device according to claim 1, characterized in that, the housing (10) includes an opening passing through in the pressing direction, wherein the actuator (40) is rotatably mounted on the In the mouth.
The electrical device according to claim 1, characterized in that the actuator (40) is rotatably arranged relative to the housing (10), wherein the actuator (40) is in the first The position (P1) and said second position (P2) are at different circumferential positions relative to said housing (10).
The electrical device according to claim 2, characterized in that the actuator (40) comprises a trigger end and an actuation end opposite to the trigger end, the trigger end can be rotated to change the actuation The position of the device (40), the actuation end is suitable for pressing the tact switch.
The electrical equipment according to claim 4, characterized in that, the trigger end further comprises a toggle portion (42) protruding radially outward from the main body (45) of the trigger end, by rotating the toggle portion ( 42) to move said actuator (40) between said first position (P1) and said second position (P2).
Electrical equipment according to claim 5, characterized in that the actuator (40) is mounted eccentrically with respect to the installation axis of the electrical equipment.
The electrical device according to claim 6, characterized in that, the toggle portion (42) protrudes more toward the installation axis at the first position (P1) than at the second position (P2) .
The electrical equipment according to claim 7, further comprising a mounting plate (20) for fixing, the housing (10) is rotatably mounted relative to the mounting plate (20),

Wherein the mounting plate (20) includes a pushing portion (22), so that when the housing (10) is rotatably mounted to the mounting plate (20), the pushing portion (22) pushes The toggle (42) moves the actuator (40) from the first position (P1) to the second position (P2).
The electrical equipment according to claim 8, characterized in that, the mounting plate (20) comprises a protruding rib (24) on the side facing the housing (10), between the housing (10) and When the mounting plate (20) is attached, the protruding rib (24) can press the actuator (40) to keep the light touch switch in the on state.
The electrical device according to claim 4, characterized in that the trigger end further comprises a tool slot (48).
The electrical device according to any one of claims 4-10, characterized in that the actuating end comprises a positioning arm (44) protruding radially outward from the main body (45) of the actuating end, the housing The body (10) includes a circumferential channel providing a path of movement for said positioning arm (44).
The electrical equipment according to claim 11, characterized in that, the circumferential channel comprises a first locking part (64) and a second locking part suitable for positioning the positioning arm (44) at different heights (66), wherein the positions of the first locking part and the second locking part are respectively the same as the first position (P1) and the second position (P2) of the actuator (40). correspond.
The electrical device according to claim 12, characterized in that said circumferential channel is formed on a cylinder (65) protrudingly extending from said housing (10), said cylinder (65) comprising a The inclined wall of the moving track of the positioning arm (44).
The electric device according to any one of claims 1-10, 12 and 13, characterized in that, the actuator (40) includes a claw (46), so that the actuator (40) can It is detachably installed into the housing (10).
The electrical device according to any one of claims 1-10, 12 and 13, characterized in that the actuator (40) is an integrally formed part.
Electrical equipment according to any one of claims 1-10, 12 and 13, characterized in that the electrical equipment comprises a smoke alarm.
An actuator (40) for a tact switch, characterized in that the tact switch can be pressed to connect an electrical circuit in the electrical device and released to disconnect the electrical circuit, so The actuators described include:

a cylindrical body (45) comprising a first end and an opposite second end;

A dial (42) protruding radially outward from the body (45) at the first end, by rotating the dial (42) so that the actuator (40) moves from the first Rotation between a position (P1) and a second position (P2), wherein in the first position (P1), the body (45) is adapted to contact the tact switch such that the tact switch is in In the on state, at the second position (P2), the main body (45) is adapted to leave a distance from the tact switch, so that the tact switch is in an off state; and

A positioning arm (44) protruding radially outward from said body (45) at said second end, said positioning arm (44) providing positioning of said actuator (40) in the direction of depression.