Intercom for internal communication network

Abstract

The invention relates primarily to an intercom (10) for an internal communication network (11), comprising a plurality of operating elements (15a, 15b, 15c, 15d), each of which is configured as a lever (49a, 49b, 49c, 49d, 49e, 49f, 49g, 49h, 49i, 49j), which can be manually moved from an inactive intermediate position (39a) in a first direction (31) to a first switching position (39b) or alternatively in a second direction (32) opposite to the first direction to a second switching position (39c), the lever being preloaded towards its intermediate position. The invention is characterized in that the lever (49) cooperates directly or indirectly with a magnet (71), which exerts a high force on the lever in a position near the middle position, urging the lever toward its middle position, and at least one spring element (73, 74) separate from the magnet additionally urges the lever into the middle position (39a).

Description

[0001] This application is a divisional application based on the Chinese patent application with application number 201811359826.1, application date November 15, 2018, and invention name “Intercom for internal communication network”. Technical Field

[0002] The present invention relates to an intercom for an internal communication network. Background Art

[0003] The applicant has been engaged in the development and manufacture of intercoms for use in internal communication networks for more than thirty years.

[0004] With regard to the functionality of the lectern within the scope of the present invention, reference is made to the applicant's patent applications listed below, the contents of which are incorporated herein in order to avoid repetitions, including reference to the individual features and also to the inclusion of the individual features in the present application: DE 10 2014 011 963 A1 and the subsequently published DE 102017 107148 A1, DE 102017 107 150 A1, DE 10 2017 106 946 A1, DE 10 2017 116 002 A1, DE 102017 116 273 A1.

[0005] Conventional intercoms feature multiple operating elements on the front of the housing. Operating one of these elements establishes a direct listening and / or speaking connection with another selected intercom. These intercoms are interconnected via a hub, which manages and organizes the internal communication network and connects the wiring.

[0006] By selecting a specific operating element and operating it, the operator of the intercom station selects a specific other intercom station.

[0007] In conventional intercoms, a lever is known, which, depending on its design, is referred to as a two-position lever or a three-position lever. The lever can be moved from a neutral position in a first direction or a second direction and is spring-loaded toward the neutral position. When moved in the first direction, for example, upward, the lever moves into a first operating position or a switching position. When moved in a second direction, directed opposite to the first direction, for example, downward, the lever moves into a second operating position or a second switching position.

[0008] The operator usually has to keep the lever depressed, for example if a listening connection or a speaking connection or a listening and speaking connection is to be provided.

[0009] The two switch positions provide different functions. For example, the first switch position ensures a talk connection, while the other switch position ensures a listen connection. As soon as the operator no longer applies force to the lever element, the lever element moves back to the center position due to the spring preload, and the listen connection, the talk connection, or both the listen and talk connection is interrupted or terminated.

[0010] Such lecterns are used, for example, at rallies or live events. Here, a large number of lecterns, say 20 or 50, can be deployed, all communicating with one another via a relay station. Especially at live events or sports, the acoustics of individual lecterns can vary greatly. Lectern users also have different preferences. Finally, the lecterns can also have different microphone configurations.

[0011] In order to allow the operator of a lectern to select a unique volume setting for each listening or speaking connection, as opposed to other lecterns, the operating elements are programmable. Thus, for example, the volume of each individual operating element can be varied and set using a volume controller. However, this setup is very cumbersome and inconvenient, and is prone to malfunctions. Summary of the Invention

[0012] Such an improvement of an intercom of the type described makes it possible to achieve an improved setting of the individual volume or other parameters associated with the operating elements while retaining the convenient selectability of the intercom to which an audio connection is to be established and while retaining the conventional, comfortable operating method.

[0013] One feature is that the lever has a rotatably mounted adjusting element for changing a parameter, or that the lever bridges such an adjusting element.

[0014] According to a first variant, the lever has a rotatably mounted adjusting element. This adjusting element is used to change and thus also set a parameter. This parameter may be, for example, the volume assigned to the operating element. The rotatably mounted adjusting element may include, for example, an adjusting wheel, a rotating lever, a knob, or the like. The adjusting element is disposed directly on the lever. In other words, the adjusting element advantageously moves together with the lever. The adjusting element may be disposed at the free end of the lever or, alternatively, at the articulated end of the lever. The adjusting element may also be disposed in the region of the middle section of the lever.

[0015] By turning the lever in a first rotational direction or in an opposite second rotational direction through a certain rotation angle or by rotating the adjusting element one or more times, a parameter, such as the volume, can be adjusted. The setting or change can also directly cause the set parameter value to be stored.

[0016] Subsequent operation of the adjusting element can reduce or increase the parameter. After the further operation is completed, the changed parameter value can be stored directly.

[0017] According to a first variant, the adjusting element for changing a parameter, particularly the volume, is arranged directly on the lever. This results in a direct association of the adjusting element with the lever, which is not available in the prior art. Furthermore, the direct arrangement of the adjusting element on the lever ensures particularly good and comfortable operability of the adjusting element.

[0018] The adjusting element is preferably used to change the volume. For example, the adjusting element can directly set or change the volume of the microphone or loudspeaker. However, as a parameter change, the adjusting element can also change a volume signal that is applied to the microphone or loudspeaker interface or assigned to one of these interfaces.

[0019] According to a second variant, the lever bridges a rotatably mounted adjustment element. In this variant, the adjustment element is, for example, rotatably mounted on the front side of the housing of the lectern, or at least rotatably mounted relative to the front side of the lectern, and simultaneously cannot be moved together with the lever. The lever bridges the adjustment element and may, for example, have a recess for this purpose. The fixed, but rotatable, adjustment element passes through the recess due to the relative movement of the lever.

[0020] Also realized equally, the adjusting element is directly assigned to the driving lever.Utilize this variant scheme also can realize the particularly good and comfortable operation of the adjusting element.

[0021] According to a second variant, the lever bridges the adjusting element, in which variant the lever can be moved over the adjusting element which is held fixed in a stationary manner.

[0022] In the middle position of the lever and in both switch positions, the rotary element is easily accessible to the operator and can be rotated and thus actuated. At the same time, however, a direct spatially close association is achieved, so that the operator can comfortably and easily move the lever and actuate the adjusting element.

[0023] According to a first variant, the adjusting element follows the displacement movement of the lever, whereas in a second variant, the adjusting element is arranged in a fixed position relative to the lectern and does not follow the displacement movement of the lever.

[0024] An intercom of the type described is developed in such a way that, while retaining the convenient selectability of the intercom to which an audio connection is to be established and while retaining the conventional, comfortable operating method, an improved setting of the individual volume or other parameters associated with the operating elements is possible.

[0025] A further feature is that the selector button includes or bridges the rotatably mounted adjusting element.

[0026] According to another advantageous embodiment, the selection key is designed in the form of a lever, thereby enabling particularly comfortable operation.

[0027] According to another embodiment, the lever can be moved along a linear motion path. In particular, when viewing the lectern from the front, that is, when viewing the housing front of the lectern, the lever can be moved vertically upward or vertically downward from a central position into one of two operating or switching positions. This allows for intuitive and comfortable operation.

[0028] According to another embodiment, at least one connection for a headset is provided on the front of the housing. This connection can be designed as an XLR male jack or as another connection for a headset. After the adjustment element is actuated, electronic further processing takes place within the lectern, for example by a control unit, in particular a processor, which ensures that a volume signal for the loudspeaker or microphone is generated at the corresponding level or signal level.

[0029] According to another advantageous embodiment, the axis of rotation of the adjusting element is oriented transversely or substantially transversely to the first direction. This also allows for intuitive, easily accessible and comfortable, yet reliable and trouble-free operation of the adjusting element.

[0030] It should be noted that the movement of the selector button or lever from the intermediate position to one of the switch positions occurs simultaneously with the movement of the adjusting element. In other words, the adjusting element is kinematically coupled or connected synchronously to the lever or selector button. This allows for particularly reliable and trouble-free operation. The user of the lectern can easily, intuitively, and reliably distinguish between the operation of the lever from its intermediate position to the first switch position or operating position and the rotational movement of the adjusting element, without these two different operations in any way influencing or superimposing each other.

[0031] According to another advantageous refinement, the lever is elongated. Furthermore, it is advantageously provided that the axis of rotation of the adjusting element lies along the longitudinal extension of the lever. In other words, the axis of rotation of the adjusting element follows the movement of the lever both in a first direction and in the opposite direction. This orientation of the axis of rotation allows for particularly good discrimination between the two operating options.

[0032] According to another advantageous embodiment, parameters are set and / or changed by rotating an adjusting element. The rotation of the adjusting element can be detected, recorded, detected, and processed in a simple, conventional manner by electronic equipment or other suitable electronic components. This allows, for example, the electronic value of the parameter to be written to or overwritten in a register. The register value can also be stored or further processed by a microprocessor in the intercom. This allows parameters, such as the volume of a microphone or loudspeaker, to be set or changed directly or indirectly.

[0033] In addition to the volume or a signal corresponding to the volume, the parameter to be changed may also be, for example, a value for a lighting device or display for the lectern, such as the value of the lighting intensity. A lighting device or display may also be directly or indirectly physically associated with the selector lever or selection button of the lectern.

[0034] The lighting intensity of the display associated with one of the selector levers or selection keys or its color or color representation can be varied or set as a parameter by rotating the adjusting element.

[0035] According to another advantageous embodiment, the number of revolutions of the adjusting element, the angle of rotation of the adjusting element, or the frequency with which the adjusting element is actuated serves as a measure of the parameter change. The angle of rotation or the number of revolutions can, in particular, correspond proportionally to the value of the parameter change. This allows for particularly simple data processing.

[0036] According to another advantageous embodiment, the intercom has a memory that stores set or changed parameter values. Thus, a computing unit or controller can also be provided on the intercom, which can access and read the memory. The parameter values ​​written to the memory can be used by the controller or other computing unit of the intercom. Thus, the volume of a loudspeaker or microphone can be stored, changed, or used as a setting.

[0037] According to another advantageous embodiment, the parameter corresponds to or includes the value of the volume of the loudspeaker. Alternatively, the parameter includes the signal value of a volume signal applied to the loudspeaker interface or the signal value of a microphone signal applied to the microphone interface.

[0038] This allows you to adjust the volume of the loudspeaker or the volume of the microphone.

[0039] According to another advantageous embodiment, the adjusting element is designed in the form of an infinitely rotatable wheel, thereby enabling particularly comfortable operation.

[0040] Alternatively, the adjusting element can also be designed in the form of a rotatable wheel which has limit stops in one or both directions of rotation.

[0041] According to another advantageous embodiment, the lever is configured as a three-position lever. This means that the lever can handle an intermediate position or a neutral position and can also occupy two deflected positions or switching positions or operating positions.

[0042] According to another advantageous embodiment, the adjusting element is arranged on the free end of the driving lever or close to the free end of the driving lever. Thus, particularly good accessibility of the operating element can be achieved while being able to comfortably operate the adjusting element.

[0043] According to another advantageous embodiment, the adjusting element can be partially enclosed by the material region of the lever, thereby preventing or reducing erroneous operation of the adjusting element.

[0044] According to another advantageous embodiment, the adjusting element is provided near the hinge end of the driving lever. Thus the user can operate the adjusting element with different areas of the finger or with different finger positions or move the driving lever from the neutral position to the switch position.

[0045] According to another advantageous embodiment, the adjusting element has ribs or projections on its circumference, thereby ensuring a particularly good feel.

[0046] Another feature is that the lever is designed as a whole to be rotatable or tiltable about a rotation axis oriented transversely to the first direction.

[0047] In this variation, the selector lever is generally rotatable or tiltable. That is, when moved, the selector lever can be moved in a first direction of motion from a neutral position to a first operating position or switch position, or in a second direction of motion opposite to the first direction of motion to a second operating position or switch position. Furthermore, the selector lever can be rotated or tilted about a rotation axis transverse to the first direction. Rotating or tilting the selector lever about the rotation axis can also be used to set or change parameters, such as the volume.

[0048] In addition, it can be provided that the time that the driving lever remains in the tilted position is used as a measure of the change or setting of the parameter. Thus, the user can change the parameter accordingly by keeping the driving lever in the tilted position for a certain period of time.

[0049] The invention further relates to an intercom station for an internal communication network.

[0050] The object of the present invention is to improve the aforementioned prior art lecture console in such a way that it offers improved operating comfort.

[0051] The present invention utilizes the characteristics of the intercom for an internal communication network to achieve the purpose, and accordingly, the present invention is characterized in that the intercom includes a plurality of operating elements, which are respectively constructed in the form of a lever, and the lever can be manually moved from an invalid intermediate position in a first direction to a first switch position or alternatively in a second direction opposite to the first direction to a second switch position, the lever is preloaded toward its intermediate position, the lever directly or indirectly cooperates with a magnet, and the magnet applies a high force to the lever in a position near the intermediate position, loading the lever toward its intermediate position, and at least one spring element separate from the magnet additionally loads the lever toward the intermediate position.

[0052] The principle of the present invention essentially consists in preloading the lever into a neutral position by at least two different elements. On the one hand, one or more spring elements, particularly conventional spring elements such as mechanical springs, including coil springs, leaf springs, helical springs, tension springs, compression springs, springs made of metal or rubber-elastic materials, or the like, can be provided, the spring force of which increases with increasing deflection of the lever, the spring force being particularly dependent on the spring constant. Such spring elements can, for example, act on a material region of the lever, such as a hinge point on the lever. As the lever is deflected from its neutral position toward one of the two switching or operating positions, the spring force increases, particularly linearly or substantially linearly. According to the present invention, such spring elements are designed to be relatively soft or small in size. This means that they exert only a small restoring force on the lever when it deviates from the neutral position and thus load the lever toward its neutral position.

[0053] According to the present invention, a magnet is additionally provided. This magnet applies an additional preload force to the lever when it is outside the neutral position, which forces the lever toward the neutral position. According to the first embodiment, the magnet is fixedly positioned so that it cooperates with the lever in the neutral position to the greatest extent possible. For example, the magnet can be provided on the lever, and the mating magnet can be fixedly positioned relative to the housing of the lectern or fixedly positioned relative to the housing of the lectern. Alternatively, the magnet can be fixedly positioned relative to the lectern, while the mating magnet is fixedly positioned relative to the movable, i.e., pivotable, lever. The lever or a section of the lever can be made of or contain a magnetic or magnetizable material, in which case the magnet and mating magnet interact with each other. In any case, at least one of the two elements, the magnet and mating magnet, is fixedly positioned relative to the housing of the lectern, while the other element is fixedly positioned relative to the lever and can move with it.

[0054] The magnet and the counter-magnet interact with one another in such a way that the magnetic force urges the lever toward its center position.

[0055] It is essential that the force generated by this magnet and the counter-magnet acts only in the near field, ie in the actual position of the lever which is arranged close to the center position.

[0056] If the operator actuates the selector lever from an intermediate position, both the force exerted by the magnet and the force exerted by the spring element must be overcome from the intermediate position. Once the selector lever exceeds a certain pivot angle while moving further from the intermediate position toward the switch or operating position, the magnet and the counter magnet are spaced apart from each other beyond the near field, so that the magnetic force no longer acts. The operator now only needs to overcome the force of the spring element in the direction of further movement of the operating element into the switch or operating position. However, this force is relatively small. This means that if the user wishes to press and hold the selector lever in one of the two operating or switch positions, they only need to overcome the minimal restoring force exerted by the spring element during this period of pressure to retain the selector lever in the operating or switch position.

[0057] During the return movement, on the other hand, a particularly easily tactilely perceptible signal indicates to the user that the intermediate position has been reached. That is, if the lever moves along its path of motion back through a defined pivot angle from one switching position to the intermediate position, and due to the return movement of the lever effected by the first spring element, the operator can feel the force of the magnet acting again, assuming the operator still has their finger on the corresponding surface of the actuating end of the lever, and the lever is thus subjected to an additional, and therefore overall stronger, second spring force.

[0058] A magnetic latching / locking can be achieved here because the movement of the lever is accelerated or becomes faster when approaching the end of the movement from the working position into the intermediate position, or is carried out under the application of a stronger restoring force or preload force. This is indicated to the user tactilely.

[0059] This improves the operating comfort of the lectern for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Further advantages of the present invention will be apparent from the following exemplary embodiments shown in the accompanying drawings. In the drawings:

[0061] Figure 1a A schematic partial cross-sectional view of a lectern according to the present invention is shown in front view,

[0062] Figure 1b Show, for example, Figure 1a An enlarged detail of the partial circle 1a in FIG, showing an operating element in an enlarged schematic partial sectional view,

[0063] Figure 2Shown in a schematic rear view Figure 1a On the back of the lectern or the back side of the housing,

[0064] Figure 3 A schematic block diagram shows an embodiment of an internal communication network using the intercom according to the present invention.

[0065] Figure 4 A schematic perspective view of a further embodiment of a lecture console according to the invention is shown with a partial view, here showing two operating elements in different positions, both of which have adjustment elements in the form of adjustment wheels near their articulated ends.

[0066] Figure 5 Use according to Figure 4 The figure shows another embodiment of the lectern according to the invention, which has two levers that are designed differently from the latter.

[0067] Figure 6 Use according to Figure 4 The figure shows another embodiment, where an adjusting element is provided on the free end of the operating lever.

[0068] Figure 7 Use according to Figure 4 The figure shows a further embodiment, in which the operating element is designed differently and the adjusting element is freely accessible,

[0069] Figure 8 Use according to Figure 4 The diagram shows something similar to Figure 7 Another embodiment, where the regulating element is partially enclosed,

[0070] Figure 9 Use according to Figure 4 The figure shows another embodiment, in which the operating element configured as a lever can be pivoted or tilted as a whole about the rotation axis.

[0071] Figure 10 roughly corresponds to Figure 4 The lever shown, for example, along Figure 4 The diagram of the longitudinal section through the section plane X-X in FIG. 1 shows a schematic partial sectional view of another embodiment of the intercom according to the invention, wherein the operating elements are shown in individual views in three different positions, and a sensor, two switches and a controller are shown in a block diagram.

[0072] Figure 11 Use according to Figure 10 The figure shows a further embodiment of the intercom according to the invention, where the operating element is shown in a single view in three different positions and where the magnet, the mating magnet and the first and second spring elements are schematically shown.

[0073] Figure 12 A further embodiment of an operating element is shown, wherein a number of individual components are shown in an exploded view.

[0074] Figure 13 showing a front view of a printed circuit board or circuit board, Figure 12 The operating element can be fixed on the circuit board in the installed state,

[0075] Figure 14 Shown in rear view according to viewing arrow XIV Figure 13 circuit boards,

[0076] Figure 15 Shown in assembled and fitted state Figure 12 operating elements,

[0077] Figure 16 For example, along Figure 15 A schematic side view in the viewing direction XIV shows Figure 15 An embodiment of

[0078] Figure 17 Use according to Figure 16 The diagram shows Figure 16 The operating element of the lever is in the middle or intermediate position.

[0079] Figure 18 Shown in a changed switch position Figure 16 and 17 operating elements,

[0080] Figure 19 Use roughly along Figure 15 The detailed view according to the viewing arrow XIX shows a perspective rear view of a circuit board element pivoted together with the operating lever, the so-called coding unit.

[0081] Figure 20a Use according to Figure 12 The figure shows a schematic exploded view of another embodiment of an operating element according to the present invention,

[0082] Figure 20b Use roughly along Figure 20a The rear view of the observation arrow XXa shows Figure 20a Detail of the lever element of the operating element,

[0083] Figure 21 A front view of an embodiment of a circuit board is shown on which a plurality of circuit boards can be fixed. Figure 20a operating elements,

[0084] Figure 22a Show the assembled state in a detailed perspective view Figure 20a operating elements,

[0085] Figure 22b Based roughly on Figure 22a The rear view of the observation arrow XXIIa shows Figure 22a operating elements,

[0086] Figure 23 Use roughly along Figure 22a A side view of the viewing arrow XXIII shows Figure 22a operating elements,

[0087] Figure 24 Show Figure 23 an operating element, wherein the lever element is in a central position, and

[0088] Figure 25 Shown in another lever position Figure 23 and 24 operating elements. DETAILED DESCRIPTION

[0089] In the description of the drawings, embodiments of the present invention are exemplarily described with reference to the drawings. Here, if different embodiments are involved, for the sake of clarity, the same parts or elements or regions are represented by the same reference numerals, sometimes with lower case letters added.

[0090] Features described with reference to only one embodiment can also be provided in any other embodiment of the invention within the scope of the invention. Even if not shown in the drawings, such modified embodiments are also included in the invention.

[0091] All disclosed features are inherently essential to the present invention. The disclosure of the relevant priority documents (copies of the earlier applications) and the cited documents and the disclosed prior art devices described are hereby incorporated in their entirety into the disclosure of the present application, with the intention that individual or multiple features of these documents are also incorporated into the present application.

[0092] according to Figure 1a The intercom station according to the present invention is generally designated by reference numeral 10. The intercom station 10 is intended to be used in an internal communication network. Figure 311 is shown as an example and generally designated by reference numeral 11. Reference numeral 10 according to the present invention is connected to a transfer station 19 via connecting line 48a. Additional intercom stations 18a, 18b are connected to the transfer station 19 via connecting lines 48b, 48c. This internal communication network 11 can be used to assist with live events, such as sporting events or concerts. Commentators, commentators, observers, or other operators can be assigned to each intercom station 10, 18a, 18b, who can communicate with another person at the corresponding intercom station. This internal communication network 11 is therefore a complex intercom or telephone system.

[0093] The intercom 10 according to the invention comprises a housing 12 which is only schematically shown in the figure and is constructed as a cube, for example. Figure 1a The front of the housing 13 is visible in Figure 2 The housing back 14 is visible in FIG. 5 and has a top wall 56 and a bottom wall 55 .

[0094] A plurality of operating elements 15a, 15b, 15c, 15d and a plurality of displays 16a, 16b, 16c, 16d are provided on the front face 13 or housing face 13 of the intercom 10. The operating elements 15a, 15b, 15c, 15d are designed as selection keys 17a, 17b, 17c, 17d. Each operating element 15a, 15b, 15c, 15d is assigned to a specific intercom in the internal communication network 11. A relay station 19 organizes and manages these direct point-to-point connections.

[0095] By operating the selected key, e.g. Figure 1a The selection key 17b in Figure 1a The user of the intercom 10 can establish a direct audio connection, such as a listening connection or a speaking connection, or a listening and speaking connection, with the operator of another intercom 18a, 18b of the internal communication network 11. That is, except operating the selection key 17, the operator does not need to perform other operations.

[0096] How this is done is described below.

[0097] according to Figure 1a , openings 28a, 28b are provided on the front side 13 of the housing, which are used for Figure 1a The openings 28a, 28b are designed as slots 30a, 30b, but may also be designed in other forms.

[0098] Furthermore, a row of interfaces such as, for example, USB interfaces 52 a, 52 b, a microphone interface 45 , a headphone interface 46 and a microphone 44 , which is only schematically shown, are provided on the housing front 13 .

[0099] The housing front 13 is designed to be essentially rectangular and has a rectangular bottom 33. On the sides 34a, 34b of the bottom 33, fastening sections 42a, 42b are provided, which have openings 43, by means of which the intercom 10 can be fastened, for example, to a mounting frame or a carriage.

[0100] according to Figure 2 , multiple interfaces 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h are arranged on the back side 14 of the shell 12 of the intercom 10, which may have, for example, a power supply interface 21, a data cable interface 22a, 22b, 22c, a BNC port 23 or a network serial interface 50.

[0101] according to Figure 1b The selector button 17 or the corresponding operating element 15 is formed by a lever 49 or operating lever 49. The lever can be moved from intermediate positions 39a, 40 in a first direction, also referred to as the vertical direction, into another position 39b, also referred to as the first operating position or first switch position. Alternatively, if the operating lever 49 is moved from the intermediate position 40 counter to the vertical direction 31, i.e., in the reverse direction 32, the lever reaches a second position 30c, referred to as the second operating position 41b or second switch position, from its intermediate position 40.

[0102] A particular feature of the intercom 10 according to the present invention is that the lever 49 ensures a first function of the intercom 10 in the first switch position 39b and a second function of the intercom 10 in the second switch position 39c. The operating element 15 or the selection key 17 can be programmed in particular so that the first operating position 41a enables a talk mode or a speaking mode, while the second operating position 41b enables a listen mode or a listening mode.

[0103] The arrangement is such that, if the operating element is not in the first operating position 41a or the second operating position 41b, it is preloaded toward the intermediate position 40. This means that the user must continue to operate the key, i.e., keep pressing or pulling it, as long as he or she wishes to execute or maintain the corresponding function of the speaker console 10, i.e., to remain in the speaking mode or the listening mode.

[0104] Now, in order to be able to set parameters, such as the volume in the listening mode or the volume in the listening mode, depending on the desired function to be achieved by the switch position of the operating lever 49, or to alternatively set the volume that is relevant for this respective operating element as a whole, according to Figures 4 to 10 In the embodiment, the adjusting element 59 is directly provided on the operating element. Figures 4 to 8 and 10 are rotatably supported. Figure 9 In an embodiment of the present invention, the lever itself is supported so that it can rotate or tilt about the pivot axis.

[0105] In accordance with Figures 4 to 8 In all embodiments of the present invention and 10, the adjusting element 59 is constituted by an infinitely rotatable wheel: in order to be able to distinguish the different adjusting elements 59 of the different embodiments, these are referred to as adjusting elements 59a to 59j. Figures 4 to 9 This is so that two operating levers 49 are shown as an operating lever pair, which are designed identically but are in different positions or states.

[0106] If observed Figures 6 to 8 As can be readily seen, the adjusting elements 59e, 59f, 59g, 59h, 59i, 59j of the operating levers 49e, 49f, 49g, 49h, 49i, 49j are each arranged at the free end 62 of the respective operating lever 49e, 49f, 49g, 49h, 49i, 49j. This ensures direct and good accessibility to the respective adjusting elements 59e, 59f, 59g, 59h, 59i, 59j. At the same time, the operating levers 49e, 49f, 49g, 49h, 49i, 49j each have an operating surface 76 that is arranged closer to the housing front 13 than the respective adjusting element 59e, 59f, 59g, 59h, 59i, 59j.

[0107] On the contrary, Figure 4 and 5 In the embodiment of the present invention, the respective adjusting elements 59a, 59b, 59c, 59d are arranged closer to the housing front 13 or closer to the articulated end 63 of the respective operating lever 49a, 49b, 49c, 49d. Here, the operating surface 77 of the respective operating lever 49a, 49b, 49c, 49d is arranged in the region of the free end 62.

[0108] It should be noted that in Figure 6 and 8 In the embodiment of the present invention, a section 64 is provided which partially encloses the adjusting elements 59e, 59f, 59i, 59j. Incorrect operation can thus be reliably avoided because only a part of the corresponding circumference 78 of the corresponding adjusting element 59e, 59f, 59i, 59j is accessible.

[0109] In addition, it should be pointed out that according to Figures 4 to 8 All adjusting elements 59a to 59j of the embodiment can be rotated around the rotation axes DA, DA1, DA2 in the rotation direction given by the arrow P1 and in the opposite direction, and the corresponding rotation axes DA, DA1, DA2 correspond to such directions, and the corresponding operating levers 49a to 49j are longitudinally extended along the said directions.

[0110] The operating element 49 can be swung around a swivel axis 65, that is, in the rotation direction of the arrow P2, so that it can be transferred from the intermediate position 39a to one of the two switching positions 39b, 39c. The swivel axis extends basically along the front side 12 of the housing or parallel to the front side 13 of the housing, while the rotation axes DA, DA1, DA2 are perpendicular to the swivel axis 65 of the operating element, and the adjusting elements 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j can be rotated around the rotation axis.

[0111] according to Figure 9 In another embodiment, the present invention also includes that the operating elements 49k, 49l as a whole can be swiveled or tilted about the swivel axes DA1, DA2. Here, a small maximum permissible swivel or tilt of only a few degrees, for example 10°, 20° or 30°, is sufficient.

[0112] The rotation or actuation of the adjusting elements 59a to 59j about the pivot axes DA, DA1, DA2 or the tilting or pivoting of the operating elements 49k, 49l can be detected and detected by suitable sensors. The direction of rotation or the pivoting direction or the swivel direction can also be detected.

[0113] according to Figure 10 In a very schematic illustration, a region of the lectern 10 is shown in a schematic partial sectional view. Here, only the operating lever 49, a detail of the housing front 13, an opening 69 in the housing front 13 through which the operating lever 49 passes, and a pivot axis 65 about which the operating lever 49 can pivot are shown, and which is, for example, fixedly arranged relative to the housing front 13. In this embodiment, an adjusting element 59 is arranged on the lever 49, which can be adjusted, for example, by pressing Figure 4 The adjusting element 59a is formed in the form of Figure 10 It's not proportional either.

[0114] Figure 10 The block diagram-like illustration shows the operating lever 49 in its center position 39a using solid lines, while the two switch positions or operating positions 39b, 39c are shown using dashed lines.

[0115] according to Figure 10, switches, detectors, or sensor elements 66a, 66b are provided on the intercom 10, which can detect, by contact, that the operating lever 49 has reached a switch position or operating position 39b, 39c. The two detectors or switches 66a, 66b are connected to a computing unit or controller 67 via schematically indicated signal or connecting lines 68a, 68b. The controller 67 can be connected to other electronic components (not shown) of the intercom 10 only via a connecting or signal line 68c indicated by a dashed line.

[0116] The form and configuration of the switches and sensors 66a, 66b are not critical to the present invention. Conventional arrangements may be employed. What is important is that the intercom 10 is able to determine that the lever 49 has reached the switch position or the operating position 39b, 39c. Upon determining that the switch position has been reached, the intercom 10 establishes a listening or speaking connection, or both, with another intercom 18a, 18b on the intercom network 11.

[0117] according to Figure 10 As schematically shown, an adjusting element 59 is provided on the operating lever 49. This adjusting element can be rotated about a schematically shown rotation axis DA. Furthermore, a sensor 70 is provided on the operating lever 49, which is also shown only schematically. The sensor 70 can also be a detector or a switch. In other embodiments of the present invention (not shown), the sensor 70 can also be fixedly mounted on the intercom 10 or on the intercom housing 12, or fixedly mounted relative to the intercom or its housing.

[0118] The sensor 70 can detect an operation of the adjusting element 59. Depending on the specific design of the adjusting element 59, the sensor 70 can also determine the direction of rotation, ie whether the adjusting element 59a is rotated in the clockwise or counterclockwise direction about the rotation axis DA.

[0119] Furthermore, the sensor 70 can determine how many revolutions the adjusting element 59 has completed. Alternatively, the rotation angle of the adjusting element 59 can also be determined.

[0120] This detected information can also be transmitted to the computing unit or control unit 67 via a control signal line 68 d , which is only shown schematically.

[0121] Here, parameters are set or changed based on the information obtained, or such a change is initiated.

[0122] According to one embodiment of the invention, the parameter can advantageously be the volume or a volume signal or a measure of the volume or a volume signal, or the parameter is related to the volume or the volume signal.

[0123] Advantageously, provision is made here for the angle of rotation of the adjusting element 59 or the number of revolutions of the adjusting element 59 or the time during which the adjusting element 59 is actuated to serve as a measure of the parameter change.

[0124] according to Figure 4 、 5 , 6 and 7, projections are provided on the circumferential surface 78 of the adjustment element 59, in the present case in the form of ribs 61. This makes it possible to easily operate the adjustment elements 59e, 59f, 59g, 59h.

[0125] according to Figure 11 , another aspect of the present invention should now be described:

[0126] Figure 11 Use something similar to Figure 10 The figure shows another embodiment of the lecture console 10 according to the present invention.

[0127] Here, no adjusting element 59 is provided on the operating lever 49. However, in other embodiments of the present invention, an adjusting element 59 may also be provided on the operating lever 49.

[0128] The operating lever 49 is in accordance with Figure 11 In the implementation form of Figure 9 The corresponding illustrations and functions of the embodiment are configured to be generally capable of swinging or tilting about an axis DA, which extends in the longitudinal direction of the operating lever 49, as shown Figure 9 shown.

[0129] But according to Figure 11 The key point of the present invention is to provide the operator operating the operating lever 49 on the intercom 10 with special tactile properties of the operating lever 49. This can achieve, on the one hand, increased comfort and, on the other hand, better information utilization for the operator:

[0130] according to Figure 11 , similar to Figure 10 As shown in the figure, the operating lever 49 can be pivoted about a pivot axis 65. Starting from the intermediate position 39a, the corresponding free end 62 of the lever 49 is moved into one of the two switching positions 39b, 39c. This is achieved by the user's finger (not shown) exerting a force on the free end 62 in the vertical direction 31, that is, in the first direction or in the opposite direction 32.

[0131] Figure 11 The embodiment shown in FIG. 4 shows that the lever 49 can be pivoted about a pivot axis fixedly arranged relative to the housing front 13 or relative to the housing 12 of the intercom 10 . The lever element 49 therefore comprises two lever arms, namely a first lever arm 79 a and a second lever arm 79 b.

[0132] In the area of ​​the second lever arm 79b, a mating magnet 72 is provided on the operating lever 49, which mating magnet cooperates with a magnet 71 fixedly arranged relative to the housing 12 of the intercom 10. The magnet 71 and the mating magnet 72 are designed so that they attract each other. Figure 11 As can be seen from the geometry of FIG, the magnet 71 acts on the magnet 72 due to the exertion of a magnetic force in such a way that the lever 49 is preloaded towards its center position 39 a according to FIG. 1 .

[0133] If the lever element 49 is now triggered from the intermediate position 39a toward one of the operating positions 39b or 39c, the force of the magnet 71 and the additional forces generated by the spring elements 73 and 74 must be overcome. However, since the magnetic force only acts within a very short range, a small pivoting angle of, for example, 5°, 10°, or 15°, of the lever 49 is sufficient to neutralize the magnetic force. Magnets 71 and 72 are advantageously designed and arranged so that they act only within a short range. In other words, the magnetic force of magnets 71 and 72 is negated when the operating lever 49 is slightly away from the intermediate position 39a.

[0134] It should be noted here that the mating magnet 72 is an element that is fixedly arranged on the operating lever 49. Alternatively, a material section of the operating element or the entire operating element 49 can also be made of a magnetic or magnetizable material.

[0135] In addition, according to Figure 11 A first spring element and a second spring element 74 are provided. The spring element 73 is fixed with one spring end at a spring hinge point 75 to the second lever arm 79b or to the lever in another area of ​​the lever 49. The springs 73, 74 are fixed to the lever in accordance with Figure 11 In the exemplary embodiment, the actuator 49 is designed as a tension spring. That is, each of the two springs 73, 74 tends to pull the operating element 49 toward itself at the end of the second lever arm 79b. When the lever 49 is in its center position 39a, a stable equilibrium position is reached because the spring forces of the two spring elements 73, 74 cancel each other out.

[0136] If the actuating lever 49 is moved from the intermediate position 39a into the second operating position 39c, the joint point 75 moves away from the fixed end 80 of the second spring element 74, so that the force exerted on the lever by the second spring element 74, i.e., the restoring force, increases. At the same time, the spring joint point 75 approaches the fixed end 81 of the first spring 73, so that this spring element 73 no longer exerts a force on the actuating lever 49.

[0137] That is, maintaining the switch position 39 c requires that the operator continuously applies a force in the direction 32 to the free end 62 of the lever 49 , which force is greater than the holding force of the spring element 74 .

[0138] But because spring element 74 (but also spring element 73) is designed very soft, the holding force applied by the operator can be designed to be very small. This makes, the operator can only with very little holding force, that is to say with high comfort to keep working position 39c.

[0139] As soon as the operator wishes to cancel the operating position or switch position 39c, he or she can suddenly or gradually stop the force applied to the lever 49, so that the lever 49 is moved from the operating position 35c in the direction of its intermediate position 39a by a pivoting movement in the counterclockwise direction about the pivot axis 65 due to the force applied by the spring element 74. Here, initially only the spring 74 is responsible for returning the lever 49.

[0140] When the lever 49 approaches its center position 39 a and the magnets 71 and 72 approach each other again until the magnetic force can act, the further restoring movement of the lever 49 toward its center position 39 a is accelerated or performed while generating a greater preload force.

[0141] The force components of the forces exerted by the magnets 71 and 72 and the forces exerted by the spring elements 73 and 74 are superimposed on each other, or in parallel. However, the forces exerted by the magnets 71 and 72 act only in the vicinity. In other words, the pivot position of the operating lever 49 located near its center position 39 c is referred to as the vicinity.

[0142] As a result, and because only the magnetic force of the magnets 71, 72 acting in the vicinity is designed to be greater than or higher than the force exerted by the springs 73, 74, it can be ensured that the switch position 39b, 39c reached can be maintained by the operator with less effort and thus without fatigue and comfort.

[0143] On the other hand, the force of the high magnetic force acting in the near field, which acts more suddenly, can also lead to a pivoting movement of the operating element 49, because this force can send a clear tactile signal to the user, namely that the lever 49 has reached its center position 39a or is about to reach the center position.

[0144] Furthermore, it should be pointed out that the calculation unit or control unit 67 can also have a memory 67 a which can be used to store set or changed parameter values ​​or to further process these values.

[0145] exist Figure 11 In the embodiment of FIG. 7 , two tension spring elements 73 , 74 are described. In other embodiments of the invention, only one spring element is provided.

[0146] Finally, instead of a tension spring, a compression spring or a leaf spring or another spring element generating a restoring force can also be provided.

[0147] It is important that at least one conventional first spring element acts over the entire pivoting range between the intermediate position 39a and the respective switching position 39b, 39c, the restoring force increasing with increasing deflection of the operating element, said spring element being of generally softer construction, and a second spring element being arranged in parallel therewith, which acts only in a nearby area, wherein the restoring force is generated in particular with the aid of a magnet.

[0148] Now refer to Figures 12 to 19 A further embodiment of an operating element 15e for the intercom according to the invention is shown:

[0149] according to Figure 12 , the operating element 15 comprises a plurality of individual components:

[0150] Figure 12 First, element 49m is shown, which is configured as an operating lever. This element comprises a main body 85 having a receptacle 109 through which an adjustment element 59m, which is rotatable about a pivot axis DA3, can be mounted. Main body 85 includes two struts 86a, 86b or pins, which are configured as pivot bearings and provide the pivot axis 65 of operating lever 49m.

[0151] In the assembled state, the pivot struts 86a, 86b are supported in openings 110a, 110b provided for this purpose in the side walls 83a, 83b. The side walls 83a, 83b together with the side wall 83c form a pivot support 82 for the actuating lever 49m. The pivot support 83 is fixed relative to the housing front 13 of the lectern, in particular to the Figure 13 On the circuit board 94 shown in FIG.

[0152] Furthermore, cam-like struts 99 a , 99 b are provided on the main body 85 , which extend through the curved slots 87 a , 87 b in the respective side walls 83 a , 83 b .

[0153] like Figures 16 to 18 As shown by the different pivot positions of the lever element 49m, the link slots 87a, 87b limit the pivoting movement of the lever 49m by means of struts 99a, 99b abutting against the ends of the link slots 87a, 87b.

[0154] For the sake of completeness, it should be pointed out that the pivot struts 86a, 86b can be mounted in the respective housing side walls 83a, 83b with the interposition of ball bearings 84a, 84b.

[0155] In addition, according to Figure 12A magnet 96 is provided which is fixedly arranged on or relative to the side wall 83 a . Figure 12 Furthermore, a pair of metal levers 97a, 97b are shown, which can be pivoted about lever pivot axes 98a, 98b, respectively. The two levers 97a, 97b are braced against each other with the aid of a spring element 100.

[0156] The connection ends of the spring element 100 are denoted by 101 a and 101 b .

[0157] In accordance with Figure 15 and 17 In the operating lever 49m in the middle position 39a, two entraining cams 99a, 99b are arranged exactly in the center between the two levers 97a, 97b.

[0158] If the lever 49m from the Figure 17 Starting from the middle position 39a, the device is deflected in the vertical direction 31 to the position according to Figure 16 The first switch position 39b is provided by the end of the support 99a, and the cam 99a is brought into contact with the lower lever 97b and moves it relative to the lower lever 97b. Figure 12 Movement is counterclockwise about the associated pivot axis 98b.

[0159] Thus, the free end of this actuating lever 97b is at first away from the magnet 96 that positionally holds, and this requires to apply a first force. In order to overcome the magnetic holding force between magnet 96 and metal, in particular the actuating lever 97a, 97b made of iron, need the first force.

[0160] As soon as the free end of the metal lever element 97b leaves the range of influence of the magnet 96, only the spring element 100, which is designed to be softer than this, forces the two lever elements 97a and 97b toward each other in their center position. Figure 16 In the first switching position 39 b , the user only needs to apply a force that counteracts the force of the spring element 100 .

[0161] In this case, the spring element 100 is therefore also connected in parallel with the arrangement consisting of the magnet 96 and the counter-magnet (formed via the metallic levers 97 a , 97 b ).

[0162] In this embodiment, the magnetic force and the force of the mechanical spring 100 act in parallel in the immediate vicinity; as soon as the lever has swung a few degrees from the neutral position, almost exclusively the mechanical spring force of the spring element 100 acts.

[0163] Therefore, here too, the lever 49m indirectly cooperates with the magnet 96 via the levers 97a, 97b.

[0164] The pair of mechanical lever elements 97a, 97b can be arranged on the first side wall 83a or on the second side wall 83b, or alternatively can also be arranged between the two side walls 83a, 83b. The respective lever elements 97a, 97b are advantageously supported directly on the side wall 83a.

[0165] The spring element 100 can be configured, for example, as a tension spring and have connecting regions 101a, 101b at its two axial end regions, which can interact with cooperating fixing regions (not shown in detail) on the two lever elements 97a, 97b. The arrangement of the spring element 100 and the lever elements 97a, 97b can be implemented such that the spring element 100 can be suspended with its ends 101a, 101b on corresponding projections on the two lever elements 97a, 97b or mounted or fixed in another manner.

[0166] In accordance with Figures 12 to 19 In the embodiment of the present invention, the adjusting element 59m is configured as a knob 88 and can be pivoted together with the operating lever 49m.

[0167] The button 88 engages on a support 89 of the encoding unit 108 . The encoding unit 108 is an arrangement which, in addition to the encoder printed circuit board 111 , also has a rotary bearing for the rotatable encoder support 89 .

[0168] Figure 12 Furthermore, a spacer ring 90 is schematically shown, which is arranged between the encoding unit 108 and the operating lever 49 m.

[0169] Furthermore, the encoding unit 108 advantageously has a plug connector 92 which can be connected to a mating plug connector 92 b on a printed circuit board 94 of the intercom.

[0170] Since the encoding unit 108 can be pivoted together with the operating lever 49 m in this exemplary embodiment, the plug connector is equipped with a flexible conductor strip 112 which allows for corresponding room for movement.

[0171] Arranged on the printed circuit board 94 are a plurality of groups of LEDs (light emitting diodes) 95 a , 95 b , 95 c , 95 d , 95 e , which can each act on light conductors 93 a , 93 b , illuminating the operating element 15 .

[0172] A switching magnet 106 is fixedly arranged relative to the side wall 83b of the rocker support 82. The switching magnet cooperates with a Hall sensor arranged on the back of the encoder circuit board 111, which can detect different operating positions 39b, 39c of the operating lever 49m relative to the side wall 83b.

[0173] Two Hall sensors that can swing together with the lever 49m are Figure 19 The Hall sensors 113a, 113b may be able to detect the relative approach of the switching magnet 106 which is fixedly arranged in the housing wall.

[0174] Reference below Figures 20a to 25 Another embodiment of the operating element 15f of the intercom 10 according to the present invention is described below:

[0175] In this embodiment, according to Figure 20a The lever element 49n is also equipped with a pivot strut 86a, which is supported in the side walls 83a, 83b of the pivot bracket 82 with ball bearings 84a, 84b arranged in between. The pivot bracket 82 is fixedly arranged relative to the circuit board or printed circuit board 94, which corresponds to the housing front 13 of the lectern or can be mounted along the Figure 21 The viewing direction of the observer is arranged parallel to the housing front and behind the housing front 13 .

[0176] Each operating element 15f also comprises a coding unit 108, which is fixedly arranged on the circuit board 94. As in the previously described exemplary embodiments, a pillar 89 protrudes from each coding unit 108, on which a knob-like adjusting element 59n is positioned rotatably about the rotation axis DA4.

[0177] exist Figures 20a to 25 In the embodiment of FIG. 5 , the adjusting element 59 n is arranged to be fixed relative to the circuit board 13 , that is, it cannot pivot together with the lever 49 n .

[0178] For this purpose, the lever 49n comprises a recess 114 through which the adjusting element 59n can be passed.

[0179] Figures 23 to 25 Different positions of the lever element 49n relative to the adjusting element 59n are shown, in particular a starting position and two working positions 39a, 39b, 39c, and it is shown that the operating lever 49n bridges the adjusting element 59n in all lever positions.

[0180] The actuating lever 49n has a body 85 with an entraining cam 99a which extends through a corresponding slot 87a in the housing wall 83a.

[0181] The spring element 103 is fixedly arranged relative to the housing wall 83a and has two vertical holding arms 104a and 104b and a horizontal adjustment arm 105. A recess or receptacle 115 is provided in the horizontal adjustment arm 105, into which the entraining cam 99a engages.

[0182] The vertical legs 104 a and 104 b are arranged fixedly relative to the housing wall 83 a , and the spring element 103 as a whole is fixed to the housing side wall 83 a .

[0183] If the holding element 49n is Figure 24 The initial position of the cam 99a is swung to the working position, and the cam 99a performs a circular motion around the axis of rotation 65 and moves along the slot. At this time, the cam drives the adjustment arm 105 of the spring element and drives it under the condition of overcoming the reset force applied by the spring arm 105.

[0184] At the same time, the switching magnet 106 arranged on the free end of the deflectable arm 105 of the spring element 103 is also displaced.

[0185] In the deflected position, that is, when the lever element 49n is in its operating position, the switching magnet 106 can interact with a Hall switch or Hall sensor 113a, 113b, which is arranged on the circuit board 94. The deflected switching position 39b or 39c of the lever element 49n can be detected by the Hall sensor 113a, 113b, respectively.

[0186] Once the operator no longer applies additional force to the lever element 49n, the spring element 103 ensures that the lever element 49n returns to the position according to Figure 24 In the middle position 39a.

[0187] Figure 20a Furthermore, a latching element 207 is shown, which ensures a mechanical central latching of the lever element 49n:

[0188] The latching element 107 may, for example, have spring projections 116a, 116b, as in Figure 22b As best seen in FIG, these spring projections are, for example, Figure 22b Complementary surfaces on the pivot strut 86a visible in the figure, in particular the recesses 117a, 117b, cooperate with one another so that the reaching of the shift lever 49n in the intermediate position is indicated by a latching mechanism which can emit a tactile signal.

[0189] exist Figures 20a to 25Due to the direct and unique and spatially very close assignment of the adjusting element 59n to the corresponding operating lever 49n, a particularly comfortable, reliable and error-free actuation or operation can be achieved in the exemplary embodiment.

[0190] Furthermore, in all embodiments of the present application, it can be optionally provided that the adjusting elements 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n are axially movable in the direction of their respective rotational axes DA, DA1, DA2, DA3, DA4 and can implement a key function. The axial movement of the adjusting element 59 can be detected by a sensor element (not shown in the figures).

[0191] For example, parameter values ​​can be set by rotating 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n, and the set parameter values ​​can be stored or accepted by pressing a button, that is, by axial movement of the adjusting element.

[0192] The present invention also includes that an axial operation of the adjustment element 35 must first be performed in order to be able to set the parameter value by subsequently rotating the adjustment elements 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n, and then a key operation must be performed again in the axial direction in order to confirm, store or accept the parameter value.

Claims

1. An intercom (10) for an internal communication network (11), comprising a plurality of operating elements (15a, 15b, 15c, 15d), each of which is designed as a lever (49a, 49b, 49c, 49d, 49e, 49f, 49g, 49h, 49i, 49j), which can be manually moved from an inactive intermediate position (39a) in a first direction (31) to a first switching position (39b) or alternatively in a second direction (32) opposite the first direction to a second switching position (39c), the lever being preloaded toward its intermediate position, characterized in that The lever (49) cooperates directly or indirectly with a magnet (71), which exerts a high force on the lever in a position near the middle position, urging the lever toward its middle position, and at least one spring element (73, 74) separate from the magnet additionally urges the lever into the middle position (39a).

2. The intercom according to claim 1, characterized in that: The magnet (71) is arranged in a fixed position relative to the housing (12) of the lectern (10), so that the magnet (71) cooperates with the lever (49) in the middle position to the greatest extent.

3. The intercom platform according to claim 2, characterized in that: A matching magnet (72) is provided on the lever (49), and the matching magnet cooperates with a magnet (71) provided in a fixed position.

4. The intercom platform according to claim 1, characterized in that: The magnetic force generated by the magnet (71) acts only in the near field, ie only in such a position of the lever that is arranged close to the center position.

5. The intercom platform according to claim 3 or 4, characterized in that: The magnetic force of the magnet (71), which acts only in the near field, is designed to be stronger than the restoring force exerted by the spring elements (73, 74) in the near field.

6. The intercom according to any one of claims 1 to 4, characterized in that: The spring element acts over the entire pivot range of the lever between the first switch position (39b), the intermediate position (39a) and the second switch position (39c), and the restoring force exerted by the spring element (73, 74) increases with increasing deflection of the operating element.

7. The intercom according to any one of claims 1 to 4, characterized in that: The magnet is fixedly arranged on a side wall of a housing (12) of the lectern (10) or fixedly arranged relative to the side wall, and is provided with a Hall sensor that can be swung together with the lever, and the Hall sensor can detect different switch positions of the lever.

8. The intercom according to any one of claims 1 to 4, characterized in that: The lever has a rotatably mounted adjusting element ( 59 , 59 a , 59 b , 59 c , 59 d , 59 e , 59 f , 59 g , 59 h , 59 i , 59 j ) for changing a parameter, or the lever bridges such an adjusting element.

9. The intercom platform according to claim 8, characterized in that: The rotation axes (DA, DA1, DA2) of the adjustment elements (59, 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j) are oriented transversely to the first direction (31).

10. The intercom platform according to claim 9, characterized in that: The levers (49, 49a, 49b, 49c, 49d, 49e, 49f, 49g, 49h, 49i) are designed to be longitudinally extended, and the rotation axes (DA, DA1, DA2) of the adjustment elements extend along the longitudinal extension direction of the levers (49, 49a, 49b, 49c, 49d, 49e, 49f, 49g, 49h, 49i, 49j).

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