Instructions and signaling devices and adapters for instructions and signaling devices

Abstract

The disclosure describes an instruction and signaling device (10) having a base body (12) designed as a cylinder with two open end portions, an operating element (14) designed for insertion into one of the open end portions of the base body and having a switch component (16) movable relative to the base body, and a multipart insertion element (20, 22) designed for insertion into the base body (12) to bridge at least a portion (240) of a switch path (24) from the switch component (16) to a contact element (18) arranged at the other of the open end portions and having a resilient element (26) which resiliently supports a component (22) of the insertion element provided for operating the contact element (18) such that the pressure of the insertion element (22) on the contact element (18) is limited to a predetermined force range.

Description

[0001] This disclosure relates to an instruction and signal device having operating elements such as buttons or keys and contact elements such as microswitches, as well as an adapter for the instruction and signal device.

[0002] Applicant's RMQ-Titan ® A series of command and signal devices make it possible to combine operating elements with contact elements. For example, the RMQ-Titan ® M22 type buttons are designed for use with corresponding M22 type contact elements. These contact elements have a predetermined switching path, for example, about 5.5 mm, and are designed to withstand forces in the range of about 5 N to 10 N.

[0003] Typically, it is only feasible to use an actuating element with other contact elements when the contact elements have a predetermined switching path and are designed for a specific force range corresponding to the actuating element. For example, using RMQ-Titan... ® Combining buttons and microswitches in the M22 series is not easy to achieve because the predetermined switching path is insufficient to operate the microswitches, and the specific force range required for operation is not suitable for the microswitches.

[0004] The combination of an operating unit and a micro switch is known in GB 1 233 400 A, and this combination can be used, for example, with a button body to operate one or more micro switches. However, in this case, it is a special design that, without further structural changes, cannot be used with, for example, RMQ-Titan... ® The button combination of the M22 series.

[0005] US 3,624,330 A describes a switch having a body, a push rod assembly, and a contact assembly, wherein the push rod assembly has a first push rod, a second push rod, a push rod spring, and a divider component, wherein the first push rod and the second push rod are telescopically engaged, the second push rod engages with and is axially movable therein with the divider component, and the push rod spring engages between the first push rod and the divider component, wherein the push rod assembly is movably connected to the body, wherein the contact assembly has a fixed contact and a movable contact, and the divider component has means for engaging the movable contact into the contact assembly.

[0006] DE 102 10 984 A1 describes a signal light for optical indication, the signal light comprising a housing having a conductive element, a light-emitting diode (the pressure element having a light-transmitting lamp top cover) in a pressure element, a hollow cover (the pressure element being configured to be axially movable in one end region of the hollow cover, and the other end portion of the hollow cover being disposed in the housing), and an electrical switch (the electrical switch being disposed in the hollow cover, located behind the light-emitting diode in its longitudinal direction, and being actuated by the axial movement of the pressure element).

[0007] DE 10 2017 113 416 B3 describes a microswitch comprising a cylindrical sleeve in which an axially movable piston is disposed. An axially movable contact pin is disposed within the piston. This contact pin interacts with two mating contacts fixed at a distance from each other in the bottom of the sleeve. The movement of the contact pin is supported by two springs. A return spring is arranged between the bottom of the sleeve and the piston, and when the microswitch is not actuated, the return spring moves the piston to its initial position. A damping spring is arranged between the contact pin and the piston's operating cap, and this damping spring ensures that the contact pin is gently placed onto the mating contacts. To suppress the movement of the contact pin before it is placed onto the mating contacts, the spring force of the damping spring is greater than that of the return spring.

[0008] The following section will introduce an instruction and signal device and an adapter for the instruction and signal device.

[0009] According to one aspect, a command and signal device is disclosed, comprising: a cylindrical base having two open ends; an operating element designed for insertion into one of the two open ends of the base and having a switching component movable relative to the base; and a multi-component insertion element designed for insertion into the base to bridge at least a portion of a switching path from the switching component to a contact element disposed at the other of the two open ends and having a resilient element that resiliently supports the component of the insertion element for operating the contact element, thereby limiting the pressure of the insertion element on the contact element within a predetermined force range. Such a command and signal device makes it possible to shorten the switching path and the pressure on the contact element, thereby allowing the use of microswitches as contact elements, which require lower contact pressure than conventional contact elements. In particular, the applicant's RMQ-Titan can be modified in this way by the insertion element and the resilient element. ®A series of command and signal devices (designed for use with conventional contact elements) make it possible to use microswitches as well. Therefore, a modular command and signal device is created that can be used with contact elements requiring different switching paths and / or contact pressures.

[0010] In a first embodiment of the command and signal device, the switching member is axially movable relative to the base, wherein the insertion element has: a needle-shaped intermediate member forming a component for operating a contact element; and a bracket arranged coaxially with the intermediate member, into which an elastic element is inserted, such that the elastic element is arranged coaxially with the intermediate member and is capable of applying force to the intermediate member, wherein the bracket is fixed in the switching member, and the intermediate member is configured to be axially movable within the bracket and pressed against a stop in the direction of the contact element by the elastic element arranged coaxially between the bracket and the intermediate member. The first embodiment specifically features a button as an operating element, which is axially movable within the base to operate the contact element.

[0011] In a first embodiment of the command and signaling device, the support may have a base and several finger-shaped retaining rods extending substantially parallel to the intermediate member from the base, wherein the base has an opening approximately at its center for the intermediate member to pass through, and the edge region of the opening in the base forms a stop for a radially protruding section for the intermediate member. Such a base may, for example, be integrally formed as a molded part. This base also makes simple assembly of the command and signaling device possible, as the intermediate member simply passes through the opening in the base of the support, and a resilient element, for example, a cylindrical shape with openings on both sides, can be fitted onto the intermediate member, thereby arranging the resilient element between the finger-shaped retaining rods and the intermediate member.

[0012] In the first embodiment of the command and signal device, the switching path can be approximately 5 mm, and the intermediate component can protrude from the bracket to such an extent, when pressed to a stop, that the switching path is shortened to approximately 1 mm. When used with a microswitch, the RMQ-Titan... ® This switching path is especially necessary for M22 type buttons.

[0013] Furthermore, in the first embodiment of the command and signaling device, the elastic element may be a helical compression spring, which is designed such that the pressure of the helical compression spring in the compressed state is approximately within a predetermined force range. Helical compression springs are advantageous because they are durable, and the pressure can be adjusted relatively precisely by appropriately selecting the spring's parameters.

[0014] In a second embodiment of the command and signal device, the switching member is rotatably movable relative to the base, wherein the insertion element has: an intermediate member that is axially movable relative to the base by rotation of the switching member within the base; and a pressure member that forms a component for operating the contact element and is mechanically connected to the intermediate member such that axial movement of the intermediate member relative to the base causes a corresponding axial movement of the pressure member, wherein the pressure member presses against a stop in the direction of the contact element by an elastic element fixed to the intermediate member. The second embodiment is specifically configured as a knob as the operating element, which is rotated within the base to operate the contact element.

[0015] In a second embodiment of the command and signal device, the switching component may have a sliding surface at a predetermined angle to the axis of rotation of the switching component, and the intermediate component has a corresponding opposing sliding surface, so that when the switching component is rotated, the sliding surface slides on the opposing sliding surface, thereby causing axial movement of the intermediate component relative to the base. Thus, the rotation of the switching component can be converted into translation of the intermediate component using relatively few devices. Furthermore, it makes it possible to use pressure contact switches such as microswitches.

[0016] In an improved embodiment of the command and signal device, the switching path can be approximately 5 mm, and the pressure member, when pressed to a stop, can protrude beyond one of the opening ends of the base to such an extent that the switching path is shortened to approximately 1 mm. When used with a microswitch, the RMQ-Titan... ® This switching path is especially necessary for M22 type buttons.

[0017] According to an improved embodiment of the command and signaling device, the elastic element can be a leaf spring, which is designed such that the pressure of the leaf spring in the bending state is approximately within a predetermined force range. The leaf spring can be made of spring steel. The leaf spring can be assembled relatively easily, for example, by fixing one end of it, particularly by clamping it at an intermediate member, so that its other end can press against a pressure member and apply contact pressure to that pressure member.

[0018] According to another aspect, an adapter for a command and signal device is disclosed, the command and signal device having: a base designed as a cylinder having two open ends; and an operating element designed for insertion into one of the two open ends of the base and having a switching member movable relative to the base, wherein the adapter has: a multi-part insertion element designed for insertion into the base to bridge at least a portion of a switching path from the switching member to a contact element arranged at the other of the two open ends and having a resilient element that resiliently supports the part of the insertion element for operating the contact element such that the pressure of the insertion element on the contact element is limited to a predetermined force range. Such an adapter could, for example, be used to extend the RMQ-Titan... ® The range of applications for the series of command and signal devices is broadened because the adapter makes it possible to use with a wider selection of contact elements.

[0019] In a first embodiment, the adapter is configured for a command and signal device in which a switching element is axially movable relative to a base. In this first embodiment, the insertion element has: a needle-shaped intermediate member forming a component for operating a contact element; and a support arranged coaxially with the intermediate member, into which an elastic element can be inserted, such that the elastic element is arranged coaxially with the intermediate member and can apply force to the intermediate member. The support is fixed within the switching element, and the intermediate member is configured to be axially movable within the support and pressed against a stop in the direction of the contact element by the elastic element arranged coaxially between the support and the intermediate member. This first embodiment of the adapter is particularly configured for use with a button as an operating element, which is axially moved within the base to operate a contact element.

[0020] In a second embodiment, the adapter is configured for a command and signal device in which a switching member is rotatably movable relative to a base. In this second embodiment, the insertion element has: an intermediate member that is axially movable relative to the base by rotation of the switching member within the base; and a pressure member that forms part for operating a contact element and is mechanically connected to the intermediate member such that axial movement of the intermediate member relative to the base causes a corresponding axial movement of the pressure member, wherein the pressure member presses against a stop in the direction of the contact element by an elastic element fixed to the intermediate member. This second embodiment of the adapter is particularly configured for use in a knob as an operating element, which is rotated within the base to operate the contact element.

[0021] Further features are derived from the following description of embodiments illustrated in conjunction with the accompanying drawings.

[0022] in:

[0023] Figure 1 The instructions and signal devices under different states according to the first embodiment are shown;

[0024] Figure 2 One embodiment of an adapter for command and signal devices is shown; and

[0025] Figure 3 The instructions and signal devices under different states according to the second embodiment are shown.

[0026] In the following description, identical elements, elements with the same function, and elements with related functions may be labeled with the same reference numerals. Absolute values ​​are provided illustratively only and should not be construed as restrictive.

[0027] Figure 1 RMQ-Titan was shown ® A series of instruction and signal devices 10, configured as buttons, are arranged above a circuit board 30 having a microswitch 18 mounted thereon as a contact element. The microswitch 18 is surrounded by LEDs (Light Emitting Diodes) 19 arranged around it on the circuit board 30. If the elements of the instruction and signal device 10 are transparent to light radiation, signals can be emitted to, for example, the switch controller of the instruction and signal device 10 via the LEDs 19, through light radiation emitted, particularly from above.

[0028] The command and signal device 10 has a cylindrical base 12 with external threads for screwing into a bracket 32. An operating element 14 is inserted at the upper open end of the base 12. The operating element 14 has a switch member 16, as indicated by the double arrows, capable of axial movement relative to and within the base 12. The upper side of the switch member 16 has a contact surface for pressing the switch member 16 into the base 12. The switch member 16 has a cylindrical middle portion with a diameter smaller than the inner diameter of the base 12, allowing this cylindrical middle portion to move axially within the base 12. Axial movement means being able to move longitudinally along the cylindrical axis of the base 12. The switch member 16 is secured in the base 12 by a retaining ring 13 (e.g., screwed onto the upper open end of the base), preventing the switch member from falling or jumping out of the base 12 at its upper end. Figure 1 In the intermediate drawing, the switch component 16 is shown in its original position, i.e., when the microswitch 18 is not activated, while Figure 1In the drawing on the left, the switch component 16 is shown in a depressed state, in which the microswitch 18 is activated.

[0029] Because of its small size, the microswitch 18 is arranged at a distance from the aforementioned components of the command and signal device 10, making it impossible to activate without additional measures. This is because the switching path required to activate the microswitch 18 is too large, and it may be impossible to maintain the pressure required for the microswitch 18, i.e., the operating pressure acting on the switching component 16 is outside the predetermined force range for the microswitch 18. In order to bridge at least a portion 240 of the switching path 24 to the microswitch 18, and to limit the pressure acting on the microswitch 18 to the predetermined force range specifically for activating the microswitch 18, a multi-component insertion element is provided for insertion into the base 12.

[0030] The multi-component insertion element has a bracket 20 that is inserted into and fixed therein in the lower cylindrical portion of the switch component 16, i.e., as the switch component 16 moves, such as... Figure 1 As can be seen in the left and middle drawings, for example, the bracket 20 can be clamped and fixed in the switch component 16, or screwed into or glued to the switch component. Within the bracket 20, the needle-shaped intermediate component 22 is arranged to be axially movable, and in such a way that the bracket 20 is arranged coaxially with the intermediate component 22. An elastic element 26, particularly in the form of a helical compression spring, is arranged between the bracket 20 and the intermediate component 22. To prevent the intermediate component 22 from falling off the bracket 20, a stop 28 is provided at the lower end of the bracket 20 to the contact element. The elastic element 26 or helical compression spring clamps between the protrusion of the intermediate component 22 and the upper closed end of the cylindrical portion of the switch component 16, and thereby elastically supports the intermediate component 22 such that, when the switch component 16 is pressed down, the pressure acting on the microswitch 18 is limited by the intermediate component 22 to a force range specifically corresponding to, or including, a force range specific to, the microswitch 18.

[0031] As in Figure 1 As can be seen in the intermediate drawing, the lower portion of the intermediate component 22 protrudes from the switching component 16 to such an extent that a portion 240 of the switching path 24 can be bridged through this lower portion. Thus, the command and signal device 10 can also be used with a microswitch 18 having a relatively low structural height. Figure 1In the case shown in the right-hand drawing, the command and signal device 10 is arranged at a greater distance from the micro switch 18 compared to the case shown in the left-hand drawing. In this case, the lower portion of the intermediate member 22 protrudes further from the cylindrical lower portion of the switch member 16 when the switch member 16 is pressed down. The helical pressure spring 26 ensures that the pressure acting on the micro switch 18 through the intermediate member 22 is within a predetermined force range. Figure 1 As shown in the left and right drawings, the instruction and signal device 10 can be flexibly used in different situations, i.e., at different distances from the contact element, and also with contact elements of different structural heights.

[0032] Figure 2 An embodiment of an insertion element with a support 20 is shown, the support having a base 200 in the form of a cylindrical portion with an opening at its center, through which a needle-like intermediate member 22 passes, such that both ends of the intermediate member 22 protrude from the base 200. A finger-like retaining rod 202 extends from the base 200, generally parallel to the intermediate member 22, to arrange a helical pressure spring 26 coaxially between the intermediate member 22 and the retaining rod 202 and to guide the base 200 in a switching member 16. As shown in the upper left drawing, the support 20 may be disposed together with the intermediate member 22 and the helical pressure spring 26 in an insertion member 21, which may be designed for insertion into the base 12 of a command and signal device 10. The insertion member 21 may be configured to be axially movable in the base 12 and, for example, movable in the direction toward a microswitch 18 by pressing the switching member 16 into the base 12.

[0033] Figure 3 RMQ-Titan was shown ® The series includes a command and signal device 10' configured as a rotary switch, arranged above a circuit board having a microswitch 18' mounted thereon as a contact element. The microswitch 18' may be surrounded by LEDs arranged around it on the circuit board, similar to... Figure 1 As shown in the diagram. If the elements of the command and signal device 10' are transparent to light radiation, signals can be emitted to, for example, the switch operator of the command and signal device 10' via LEDs, through light radiation emitted, particularly from above.

[0034] The command and signal device 10' has a cylindrical base 12' with external threads for screwing into a bracket of the command and signal device. An operating element 14' can be inserted at the upper open end of the base 12', such as... Figure 3As shown in the right-hand drawing, the operating element 14' has a switch member 16' capable of rotating relative to and within the base 12', as indicated by the double arrows. The upper side of the switch member 16' has a gripping surface for rotating within the base 12'. The switch member 16' has a cylindrical middle portion with a diameter smaller than the inner diameter of the base 12', allowing this cylindrical middle portion to rotate within the base 12'. Rotational movement means the ability to rotate about the cylindrical axis of the base 12'. The switch member 16' is secured to the base 12' by a retaining ring 13' (which is, for example, screwed onto the upper open end of the base), preventing the switch member from falling off or jumping out of the base 12' at its upper end. Figure 3 In the left and middle drawings, the command and signal device 10' is shown without the operating element 14', while... Figure 3 In the drawing on the right, the instruction and signal device 10' is shown as having an operating element 14' inserted.

[0035] The microswitch 18', due to its small size, is arranged at a distance from the aforementioned components of the command and signal device 10', making it impossible to activate without additional measures. This is because the switching path required to activate the microswitch 18' is too large, and it may be impossible to maintain the pressure required for the microswitch 18', i.e., the operating pressure acting on the switching component 16' is outside the predetermined force range for the microswitch 18'. In order to bridge at least a portion of the switching path to the microswitch 18, and to limit the pressure acting on the microswitch 18 to the predetermined force range specifically for activating the microswitch 18, a multi-component insertion element is provided for insertion into the base 12.

[0036] The multi-component insertion element has an intermediate component 20' that is axially movable relative to the base 12' by rotation of the switching component 16' within the base 12'. Furthermore, the intermediate component 20' has a pressure component 22', which forms part configured to operate the micro switch 18' and is mechanically connected to the intermediate component 20' such that axial movement of the intermediate component 20' relative to the base 12' causes a corresponding axial movement of the pressure component 22'. In this case, the pressure component 22' presses against the stop 28' in the direction of the micro switch 18' via a spring-like elastic element 26' fixed to the intermediate component 20'. Rotation of the switching component 16' is converted into axial movement of the intermediate component 20' and the pressure component 22' by a mechanism described below: for this purpose, the switching component 16' has a sliding surface 160' arranged at a first predetermined angle to the axis of rotation of the switching component 16'. Similarly, the intermediate component 20' has a corresponding opposing sliding surface 200', which is arranged at a second predetermined angle with the rotation axis of the switch component 16', approximately equal to the first angle, for example, approximately 45°. When the switch component 16' is rotated, the sliding surface 160' of the switch component 16' slides on the opposing sliding surface 200' of the intermediate component 20'. Because the rotating switch component 16' cannot move axially due to the retaining ring 13', the sliding surfaces 160' and 200' cause the intermediate component 20' to move axially downward, i.e., to move relative to the base 12' in the direction of the contact element, i.e., to move within the base 12'. This also causes the pressure component 22' to move downward toward the micro switch 18', so that when the intermediate component 20' moves axially downward to its lowest position, the pressure component 22' presses against the micro switch 18', making the micro switch operable. This causes the pressure component 22' to press against the leaf spring 26', which bends upward. In this case, the pressure of the leaf spring 26' is designed such that it is approximately within the predetermined force range for the micro switch 18'.

[0037] As in Figure 3 As can be seen, the lower portion of the intermediate pressure member 26' protrudes from the switch member base 12' to such an extent that a portion of the switching path can be bridged through this lower portion. Thus, the command and signal device 10' can also be used with a microswitch 18' having a relatively low structural height. Depending on the arrangement of the sliding surfaces 160', 200', i.e., according to the angle selection, the distance the pressure member 26' can move from the base 12' can be adjusted. For example, selecting an angle of less than 45° between the sliding surfaces 160', 200' and the axis of the base 12' allows for bridging a larger switching distance than selecting an angle greater than 45°. Therefore, the command and signal device 10' can be flexibly used in different situations, i.e., at different distances from the contact element, and also with contact elements of different structural heights.

Claims

1. A command and signal device, the command and signal device comprising: - A cylindrical base with two open ends; - An operating element designed for insertion into one of the open ends of the base and having a switching component capable of moving relative to the base; and - A multi-component insertion element, designed to be inserted into the substrate to bridge at least a portion of a switching path from the switching component to a contact element disposed at another open end in the open end, and having a resilient element that resiliently supports the arrangement of the insertion element for operating the contact element such that the pressure of the component on the contact element is limited to a predetermined force range. - wherein the switching component is axially movable relative to the base, and wherein the insertion element has: a needle-shaped intermediate component, the needle-shaped intermediate component forming the component configured to operate the contact element; The device includes a bracket arranged coaxially with the intermediate component, and an elastic element that can be inserted into the bracket such that the elastic element is arranged coaxially with the intermediate component and can apply force to the intermediate component. The bracket is fixed in the switch component, and the intermediate component is configured to be axially movable in the bracket and pressed against a stop in the axial direction of the contact element by the elastic element arranged coaxially between the bracket and the intermediate component.

2. The command and signal device of claim 1, wherein the support has a base and a plurality of finger-shaped retaining rods extending substantially parallel to the intermediate member from the base, wherein the base has an opening substantially at its center for the intermediate member to pass through, and the opening forms a stop for the radial protrusion of the intermediate member in an edge region of the base.

3. The command and signal device according to claim 1 or 2, wherein the switching path is about 5 mm, and the intermediate member, when pressed to the stop, protrudes sufficiently from the bracket to shorten the switching path to about 1 mm.

4. The command and signal device according to claim 1 or 2, wherein the elastic element is a helical compression spring, the helical compression spring being designed such that the pressure of the helical compression spring in the compressed state is approximately within the predetermined force range.

5. A command and signal device, the command and signal device comprising: - A cylindrical base with two open ends; - An operating element designed for insertion into one of the open ends of the base and having a switching component capable of moving relative to the base; and A multi-component insert element, designed for insertion into the base to bridge at least a portion of a switching path from the switching component to a contact element disposed at another open end in the open end, and having an elastic element that elastically supports the insert element's arrangement for operating the contact element such that the pressure of the insert element on the contact element is limited within a predetermined force range, wherein the switching component is rotatable relative to the base, and wherein the insert element has an intermediate component that is axially movable relative to the base by rotation of the switching component within the base; And a pressure member, the pressure member being formed and configured for operating the contact element and mechanically connected to the intermediate member such that axial movement of the intermediate member relative to the base causes a corresponding axial movement of the pressure member, and wherein the pressure member is pressed against a stop in the direction of the contact element by the elastic element fixed to the intermediate member.

6. The command and signal device according to claim 5, wherein the switching member has a sliding surface at a predetermined angle to the axis of rotation of the switching member, and the intermediate member has a corresponding opposing sliding surface, such that when the switching member is rotated, the sliding surface slides on the opposing sliding surface, thereby causing the intermediate member to move axially relative to the base.

7. The command and signal device according to claim 5 or 6, wherein the switching path is about 5 mm, and the pressure member, when pressed to the stop, protrudes sufficiently beyond the other opening end of the opening end of the base to shorten the switching path to about 1 mm.

8. The command and signaling device according to claim 5 or 6, wherein the elastic element is a leaf spring, the leaf spring being designed such that the pressure of the leaf spring in a bent state is approximately within the predetermined force range.

9. An adapter for an instruction and signaling device according to any one of claims 1 to 4, the instruction and signaling device having: a base designed as a cylinder having two open ends; and an operating element, the operating element being designed for insertion into one of the open ends of the base and having a switching component capable of axial movement relative to the base, wherein the adapter has: - A multi-component insertion element, designed to be inserted into the substrate to bridge at least a portion of a switching path from the switching component to a contact element disposed at another open end in the open end, and having a resilient element that resiliently supports the arrangement of the insertion element for operating the contact element such that the pressure of the insertion element on the contact element is limited to a predetermined force range. -The insertion element wherein the insertion element has: a needle-shaped intermediate part, the needle-shaped intermediate part being configured to operate the contact element; The device includes a bracket arranged coaxially with the intermediate component, an elastic element that can be inserted into the bracket such that the elastic element is arranged coaxially with the intermediate component and can apply force to the intermediate component, wherein the bracket can be fixed in the switch component, and the intermediate component is configured to be axially movable in the bracket and pressed against a stop in the direction of the contact element by the elastic element arranged coaxially between the bracket and the intermediate component.

10. An adapter for an instruction and signaling device according to any one of claims 5 to 8, the instruction and signaling device having: a base designed as a cylinder having two open ends; and an operating element, the operating element being designed for insertion into one of the open ends of the base and having a switching component capable of rotatable relative to the base, wherein the adapter has: - A multi-component insertion element, designed to be inserted into the substrate to bridge at least a portion of a switching path from the switching component to a contact element disposed at another open end in the open end, and having a resilient element that resiliently supports the arrangement of the insertion element for operating the contact element such that the pressure of the insertion element on the contact element is limited to a predetermined force range. -The insertion element wherein the insertion element has: an intermediate component that is axially movable relative to the base by rotation of the switching component in the base; And a pressure member, the pressure member being formed and configured for operating the contact element and mechanically connected to the intermediate member such that axial movement of the intermediate member relative to the base causes a corresponding axial movement of the pressure member, and wherein the pressure member is pressed against a stop in the direction of the contact element by the elastic element fixed to the intermediate member.

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