Talk station for intercom network

Abstract

The invention relates to, among others, a communication station (10) for an intercom network (11), comprising a plurality of operating elements (15a, 15b, 15c, 15d) each of which are configured in the manner of a lever (49a, 49b, 49c, 49d, 49e, 49f, 49g, 49h, 49i, 49j), wherein a lever starting from an inactive middle position (39a) is manually shiftable in a first direction (31) into a first switching position (39b) or alternatively shiftable in a second direction (32) contrary to the first into a second switching position (39c), wherein the lever is biased toward its middle position. The special feature of the invention consists, among others, in that the lever comprises a rotatably mounted adjustment element (59, 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j) for changing a parameter.

Claims

1. A communication station for an intercom network for audio communication between a plurality of users and comprising: a housing associated with one of the users of the network and carrying a plurality of operating levers each associated with a talk/listen audio channel to a respective other one of the users and manually shiftable only linearly in a first direction starting from an inactive middle position into a first switching position corresponding to a listen mode via the respective audio channel with the respective other user or into a second switching position along a second direction opposite the first direction and corresponding to a talk mode via the respective audio channel with the respective other user, a spring or magnet in the housing biasing each of the levers into the respective middle position, and a respective adjustment element at each of the levers and rotatable independently of movement of the respective lever for changing a volume level for the listen mode of the respective operating lever between the one user and the respective other user over the respective audio channel.

2. The communication station according to claim 1, further comprising; a port for a headset on the housing front.

3. The communication station according to claim 1, wherein a rotary axis of the adjustment element is transverse to the first direction.

4. The communication station according to claim 1, wherein the lever is elongated and a rotary axis of the adjustment element extends along a longitudinal extension of the lever.

5. The communication station according to claim 1, wherein a number of revolutions of the adjustment element or the size of the angle of rotation about which the adjustment element has been rotated is a measure for a change of the parameter.

6. The communication station according to claim 1, wherein the communication station comprises a memory that stores the set or changed parameter value.

7. The communication station according to claim 1, wherein the parameter corresponds to a value for the volume level of the loudspeaker or comprises such a value or comprises a signal value for a volume level signal present at the loudspeaker port or a signal value for a microphone signal present at the microphone port.

8. The communication station according to claim 1, wherein the adjustment element is a continuously rotatable wheel.

9. The communication station according to claim 1, wherein actuation of the adjustment element in a first sense of rotation increases the parameter value and actuation of the adjustment element in a second sense of rotation opposite the first direction reduces the parameter value.

10. The communication station according to claim 1, wherein the adjustment element is at or close to the free end of the lever.

11. The communication station according to claim 1, wherein the adjustment element is partially surrounded by material portions of the lever that partially overreach an outer surface of the adjustment element.

12. The communication station according to claim 1, wherein the adjustment element is close to a pivoted end of the lever.

13. The communication station according to claim 1, wherein the adjustment element has ribs or projections on its outer surface.

14. The communication station according to claim 1, wherein the adjustment element is carried and rotatable on the respective lever.

15. The communication station according to claim 1, wherein the adjustment element is mounted on the housing adjacent the respective lever.

16. A communication station for an intercom network, the station comprising: a housing with a housing front and a housing rear side, a plurality of programmable operating elements, a plurality of displays on the housing front, the operating elements being selection buttons, the communication station, as a result of an operator actuating a selection button, providing a direct listening and/or speaking connection to a selected other communication station of the intercom network via an exchange station, a plurality of ports on the housing rear side, at least one loudspeaker or a port for a loudspeaker fixed on the housing front, a microphone and/or a port for a microphone on the housing front, a selection button manually shiftable only linearly in a first direction starting from a middle position into a first working position or alternatively shiftable in a second direction opposite the first direction into a second working position, a spring or magnet biasing the selection button toward its middle position, and a volume-adjustment element rotatable independently of movement of the respective lever, the selection button comprising or spanning over the rotatable adjustment element.

17. The communication station according to claim 16, wherein the selection button is a lever.

18. A communication station for an intercom network, the station comprising: a plurality of operating levers of which one is manually shiftable only linearly in a first direction from an inactive middle position into a first switching position or shiftable in a second direction opposite the first direction into a second switching position; a magnet biasing the one lever toward its middle position, the magnet exerting high forces up on the one lever when close to the middle position, the forces being effective on the one lever to displace the one lever toward its middle position; and a spring element separate from the magnet that biases the one lever toward the respective middle position.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Further advantages of the invention are revealed in the sub-claims not cited as well as by way of the embodiments shown in the figures hereunder. In the drawing

(2) FIG. 1 is a partially cut schematic of the front of a communication station according to the invention,

(3) FIG. 1a shows a schematic, partially cut and enlarged detail view of an operating element, roughly as per reference circle Ia in FIG. 1,

(4) FIG. 2 is a schematic rear view of the back or housing rear side of the communication station of FIG. 1,

(5) FIG. 3 is a schematic, block-diagram-type view of an embodiment of an intercom network with communication stations according to the invention,

(6) FIG. 4 is a perspective, schematic, simplified view of an extract of a further embodiment of an inventive communication station, wherein here two operating elements are shown in different positions which close to their pivoted end comprise an adjustment element in the form of a setting wheel,

(7) FIG. 5 shows a further embodiment of the inventive communication station in a view as per FIG. 4, but with two levers different from those in FIG. 4,

(8) FIG. 6 shows a further embodiment in a view as per FIG. 4, wherein here adjustment elements are on the free ends of the actuating levers,

(9) FIG. 7 shows a further embodiment in a view as per FIG. 4, wherein the operating elements are designed differently and the adjustment elements are freely accessible,

(10) FIG. 8 shows a further embodiment similar to FIG. 7 in a view as per FIG. 4, wherein the adjustment elements are partially encompassed,

(11) FIG. 9 shows a further embodiment in a view as per FIG. 4, wherein here the actuating element shaped as a lever can be pivoted or tilted as a whole about a rotary axis,

(12) FIG. 10 shows a further embodiment of the inventive communication station in a partially cut schematic view, wherein here the operating element is shown in detail in three different positions, and wherein a sensor, two switches and a control are merely indicated in form of a kind of block diagram, in a view corresponding to a longitudinal section through a lever as per FIG. 4, roughly along the cutting plane X-X in FIG. 4,

(13) FIG. 11 is a view as per FIG. 10, a further embodiment of an inventive communication station, wherein here the operating element is shown in detail in three different positions, and wherein here a magnet, a counter-magnet and a first and a second spring element are shown,

(14) FIG. 12 shows a further embodiment of an actuating element, depicting numerous individual components in an explosive view,

(15) FIG. 13 is a front view of a printed circuit board, on which a number of operating elements of FIG. 12 can be fastened when assembled,

(16) FIG. 14 is a rear view of the circuit board of FIG. 13 as per viewing arrow XIV,

(17) FIG. 15 shows the operating element of FIG. 12 when assembled and mounted,

(18) FIG. 16 shows the embodiment of FIG. 15 in a schematic side view roughly along viewing arrow XVI in FIG. 15,

(19) FIG. 17 shows the operating element of FIG. 16 in a view as per FIG. 16, with the lever element in a middle or central position,

(20) FIG. 18 shows the operating element as per FIGS. 16 and 17 in a changed switching position,

(21) FIG. 19, in a perspective rear view, shows a circuit board element, the so-called encoder unit that can be pivoted in unison with the actuating lever, in detail roughly along viewing arrow XIX in FIG. 15,

(22) FIG. 20 shows a further embodiment of an inventive operating element in a perspective explosive view as per FIG. 12,

(23) FIG. 20a shows a lever element of the operating element of FIG. 20 in detail in a rear view roughly along viewing arrow XXa in FIG. 20,

(24) FIG. 21, shows the front of an embodiment of a circuit board to which a number of operating elements as per FIG. 20 can be attached,

(25) FIG. 22, is a perspective detail view of the operating element of FIG. 20 when assembled,

(26) FIG. 22a shows the operating element of FIG. 22 in a rear view roughly along viewing arrow XXIIa in FIG. 22,

(27) FIG. 23 shows the operating element of FIG. 22 in a lateral view roughly along viewing arrow XXIII in FIG. 22,

(28) FIG. 24 shows the operating element of FIG. 23 with a lever element in the middle position, and

(29) FIG. 25 shows the operating element of FIGS. 23 and 24 with the lever in yet a further position.

SPECIFIC DESCRIPTION OF THE INVENTION

(30) Embodiments of the invention will now be described by way of example in the description of the figures hereunder and with reference to the drawings. For the sake of clarity, and insofar as different embodiments are concerned, identical parts or comparable parts or elements or areas are marked with the same reference symbols, partially with the addition of lower case letters.

(31) Characteristics which are described only with reference to one embodiment may, in terms of the invention, be provided also in other embodiments of the invention. Embodiments altered in this way, even if not depicted in the drawings, are covered by the invention.

(32) All disclosed features are, on their own, essential to the invention. The disclosure content of the associated priority documents (copy of prior application) as well as the cited publications and described state-of-the-art devices are herewith fully included in the disclosure of the application, also for the purpose of including individual or a number of features of these documents in one or more claims of the present application.

(33) As evident from FIG. 1 an embodiment of a communication station according to the invention is generally marked with the reference symbol 10. The communication station 10 is used in an intercom network which is shown by example in FIG. 3 and generally marked with 11. The communication station 10 according to the invention is connected to an exchange station 19 via a connecting line 48a. Other further communication stations 18a, 18b are connected to the exchange station 19 via connecting lines 48b, 48c. The intercom network 11 can for example be used at live events such as sports events or music events. Each communication station 10, 18a, 18b may be occupied by for example a commentator, moderator, observer or other operator, who can communicate with another person at another communication station. Insofar the intercom network is a complex two-way communication system.

(34) The communication station 10 according to the invention comprises a housing 12 shaped, for example, as a cube and merely schematically indicated in the figures, with a housing front 13 shown in FIG. 1, a housing rear side 14 shown in FIG. 2 and a ceiling wall 56 as well as a floor wall 55.

(35) The front side 13 or housing front 13 of the communication station 10 has a plurality of operating elements 15a, 15b, 15c, 15d and a plurality of displays 16a, 16b, 16c, 16d on it. The operating elements 15a, 15b, 15c, 15d are configured as selection buttons 17a, 17b, 17c, 17d. The operating elements 15a, 15b, 15c, 15d are programmable so that for example each operating element 15a, 15b, 15c, 15d can have a certain other communication station of the intercom network 11 assigned to it. The exchange station 19 administers and manages these direct point-to-point connections.

(36) By operating a certain selection button, e.g. the selection button 17b in FIG. 1, the user of this communication station 10 as per FIG. 1 can establish a direct audio connection, e.g. a listening connection or a speaking connection or a listening-speaking connection with an operator of another communication station 18a, 18b of the intercom network 11. All the operator has to do is actuating the selection button 17.

(37) The details of this process are described further below.

(38) As shown in FIG. 1 openings 28a, 28b are provided on the housing front 13 for the emission of sound waves from a loudspeaker 24 merely indicated in FIG. 1. The openings are shaped in the manner of slots 30a, 30b, but other shapes are possible.

(39) In addition the housing front 13 has a number of ports on it, such as USB ports 52a, 52b, a microphone port 45, a headset port 46 and also a mere indication for a microphone 44.

(40) The housing front 13 is basically shaped as a rectangle and comprises a rectangular base surface 33. Fastening sections 42a, 42b are on the lateral edges 34a, 34b of the base surface 33, the fastening sections comprising openings 43, with the aid of which the communication station 10 can be fixed to a mounting frame or rack.

(41) On the rear side 14 of the housing 12 of the communication station 10 a plurality of ports 20a, 20b, 20b, 20d, 20e, 20f, 20g, 20h are arranged, such as for example a voltage supply port 21, data cable ports 22a, 22b, 22c, a BNC port 23 or a network “looping-through” port 50.

(42) As shown in FIG. 1a a selection button 17 or a corresponding Operating element 15 is configured as a lever 49 or an actuating lever 49. This can, starting from a middle position 39a, 40, be shifted along a first direction 31, also called a vertical direction, into another position 39b that may be called a first working position or switching position. When alternatively, the lever is shifted starting from the middle position 32, contrary to the vertical direction 31, i.e. in counter-direction 32, it reaches starting from its middle position 40 a second position 39c that is called second working position 41b or second switching position.

(43) The speciality of the communication station 10 according to the invention consists in that the lever 49, in a first switching position 39b, ensures a first function of the communication station 10 and, in a second switching position 39c, ensures a different second function of the communication station 10. In particular the operating element 15 or a selection button 17 is programmable in such a way that in a first working position 41a a talking mode or speaking mode is achieved, and in the second working position 41b a listening mode is achieved.

(44) The layout is designed such that the actuating element, when in the first working position 41a or in the second working position 41b, is biased in direction of the middle position 40. Therefore the user must, as long as he wants to perform or maintain the respective function of the communication station 10, i.e. as long as he wants to remain in the talking mode or in the listening mode, keep the button actuated, i.e. hold and press it or hold and pull it.

(45) Now, in order to be able to set a parameter corresponding to the desired function reached by means of the switching position of the actuating lever 4, for example the volume level in the listening mode, or in order to be able alternatively, to set the volume level which is altogether relevant for this particular operating element, an adjustment element 59 is directly on the actuating element, as evident from the embodiments of FIGS. 4 to 10. In the embodiments of FIGS. 4 to 8 and 10, this adjustment element is rotatably mounted. In the embodiment of FIG. 9 the lever is mounted so as to be intrinsically rotatable or so as to be tiltable about a pivot axis.

(46) In all embodiments 4 to 8 and 10 the adjustment element 59 is formed by a continuously rotating wheel. In order to differentiate between the different adjustment elements 59 of the different embodiments, these adjustment elements are marked with 59a to 59j. In FIGS. 4 to 9, this is done in that respectively two actuating levers 49 are depicted as an actuating lever pair and configured identically, but are shown in different positions.

(47) As the observer will immediately recognize in FIGS. 6 to 8, the adjustment elements 59e, 59f, 59g, 59h, 59i, 59j of the actuating levers 49e, 49f, 49g, 49h, 49i, 49j are respectively at a free end 62 of the respective actuating lever 49e, 49f, 49g, 49h, 49i, 49j. As a result good direct accessibility of the respective adjustment elements 59e, 59f, 59g, 59h, 59i, 59j is achieved. The actuating levers 49e, 49f, 49g, 49h, 49i, 49j also comprise a good actuating surface 76 that is closer to the housing front 13 than the respective adjustment element 59e, 59f, 59g, 59h, 59i, 59j.

(48) With the embodiments in FIGS. 4 and 5 by contrast, the respective adjustment elements 59a, 59b, 59c, 59d are closer to the housing front 13/closer to the pivoted end 63 of the respective actuating lever 49a, 49b, 49c, 49d. Here the actuating surfaces 77 of the corresponding actuating lever 49a, 49b, 49c, 49d are in the area of the free end 62.

(49) It is pointed out that in the embodiments of FIGS. 6 and 8 sections 64 are provided which partially encompass the adjustment element 59e, 59f, 59i, 59j. This ensures that operating errors are avoided because respectively only part of the respective outer surface 78 of the respective adjustment element 59e, 59f, 59i, 59j is accessible.

(50) Further we would point out that all adjustment elements 59a to 59j shown in the embodiments of FIGS. 4 to 8 are rotatable about a rotary axis DA, DA1, DA2 in a direction of rotation specified by arrow P1 and contrary thereto, wherein the corresponding rotary axis DA, DA1, DA2 corresponds to a direction, along which the respective actuating lever 49a to 49j extends elongated in longitudinal direction.

(51) Whilst the pivot axis 65, about which the actuating element 49 is respectively pivotable (i.e. in the direction of rotation of arrow P2) in order to be transferred from the middle position 39a into one of the two switching positions 39b, 39c, essentially extends along the housing front 13 or parallel to the housing front 13, the rotary axis DA, DA1, DA2 about which the adjustment element 59a, 59b, 59c, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j is rotatable, extends perpendicularly to the pivot axis 65 of the actuating element.

(52) As evident from the embodiment of FIG. 9 it is also covered by the invention if the actuating element 49k, 491 is, as a whole, pivotable or tiltable about a pivot axis DA1, DA2. Here a maximum admissible pivoting or tilting about a specified angle of only a few degrees, e.g. 10°, 20° or 30° is sufficient.

(53) The rotation or actuation of an adjustment element 59a to 59j or the tilting or pivoting of an operating element 49k, 491 about a pivot axis DA, DA1, DA2 can be captured and detected by suitable sensors. The sense of rotation or the sense of pivoting can also be captured in a similar manner.

(54) As evident from FIG. 10 an area of the communication station 10 is depicted in a partially cut very schematic view. All that is shown is an actuating lever 49, a part of the housing front 13, an opening 69 in a housing front 13 through which the actuating lever 49 extends, a pivot axis 65 about which the actuating lever 49 is pivotable, and which is e.g. immovably relative to the housing front 13. With this embodiment an adjustment element 59 on the lever 49 is hinted at which may be configured in the manner of the adjustment element 59a of FIG. 4, wherein FIG. 10 again is not drawn to scale:

(55) The block-diagram-type view of FIG. 10 shows the actuating lever 49 in its middle position 39a drawn as a solid line and to the two switching positions or working positions 39b, 39c drawn as broken lines.

(56) As evident from FIG. 10 switches, detectors and sensor elements 66a, 66b can be provided on the communication station 10 that can detect by way of contacting that a switching position or working position 39b, 39c of the actuating lever 49 has been reached. The two detectors or switches 66a, 66b are connected via schematically drawn signal or connecting lines 68a, 68b to a computing unit or control 67. The control 67 can be connected via a connecting or signal line 68c of which merely a small section is shown, to further electronic components (not shown) or the communication station 10.

(57) The type and configuration of the switches and sensors 66a, 66b is not important to the invention. Conventional arrangements may be employed here. What is important is that the communication station 10 is capable of detecting that a switching or working position 39b, 39c of the actuating lever 49 has been reached and that further electronic data processing is carried out. It is not until it is detected that a switching position has been reached, that the communication station 10 establishes an audio connection, i.e. a listening or speaking connection or a listening and speaking connection to another communication station 18a, 18b of the intercom network 11.

(58) As evident from the schematic diagram in FIG. 10 an adjustment element 59 is on the actuating lever 49. This is rotatable about a schematically indicated rotary axis DA. In addition, again as schematically indicated, the actuating lever 49 has a sensor 70 on it. The sensor 70 may also be a detector or switch. With further embodiments of the invention not shown, the sensor 70 may be on or relative to, the communication station 10 or relative to the housing 12 of communication station.

(59) The sensor 70 can detect an actuation of the adjustment element 59. Depending on the configuration of the adjustment element 5 the sensor 70 may also detect the sense of rotation, i.e. as to whether the adjustment element 59a rotates clockwise or anti-clockwise about the rotary axis DA.

(60) Moreover the sensor 70 may detect the number of revolutions which the adjustment element performs. Alternatively an angle of rotation of the adjustment element 59 may be detected.

(61) The captured information may be similarly communicated to a computing unit or control unit 67 via a merely schematically indicated control signal line 68d.

(62) Based on the information contained therein a parameter can be set or changed or the setting of a parameter can be initiated.

(63) Advantageously according to one embodiment of the invention the parameter comprises a volume level or volume level signal or a measure for the volume level or volume level signal or it is related to the volume level or the volume level signal.

(64) Advantageously it is provided that either the angle of rotation by which the adjustment element 59 is rotated, or the number of revolutions of the adjustment element 59 or the time during which the adjustment element 59 is actuated, is used as a measure for the parameter change.

(65) As evident from FIGS. 4, 5, 6 and 7 projections, here in the form of ribs 61, are on the outer surface 78 of the adjustment element 59. This makes actuation of the adjustment element 59e, 59f, 59g, 59h easier.

(66) As evident from FIG. 11 a further aspect of the invention will now be described:

(67) FIG. 11, in a view similar to FIG. 10, shows a further embodiment of a communication station 10 according to the invention.

(68) Here no adjustment element 59 is on the actuating lever 49. In further embodiments of this invention however arranging an adjustment element 59 on the actuating lever 49 is certainly possible.

(69) The actuating lever 49 in the embodiment as per FIG. 11 may be configured, analogue to the view and function of the embodiment in FIG. 9, so as to be pivotable or tiltable about an axis DA that extends along a longitudinal extension of the actuating lever 49, as shown in FIG. 9.

(70) As evident from FIG. 11 however, the important point of the invention is to offer to an operator who actuates an actuating lever 49 at a communication station 10 a particularly tactile behavior of an actuating lever 49. On the one hand this provides increased comfort and on the hand an improved use of information for the operator.

(71) As evident from FIG. 11 the actuating lever 49, analogue to the view in FIG. 10, is pivotable about a pivot axis 65. The respectively free end 62 of the lever 49 can be shifted, starting from a middle position 39a, into one of the two switching positions 39b, 39c. This is effected by a force impacting at the free end 62 by means of a finger of a user, either in vertical direction 31, i.e. along the first direction, or in counter-direction 32.

(72) The embodiment in FIG. 11 makes it clear that the lever 49 is pivotable about a pivot axis 65 immovably fixed relative to the housing front 13 or relative to a housing 12 of the communication station 10. The lever element 49 insofar comprises two lever arms, i.e. a first lever arm 79a and a second lever arm 79b.

(73) In the area of the second lever arm 79b a counter-magnet 72 is on the actuating lever 49 that cooperates with a magnet 71 relative to the housing 12 of the communication station 10. Magnet 71 and counter-magnet 72 are designed such that they attract each other. The geometry of FIG. 11 makes it clear that the magnet 71, due to the magnetic forces being exerted impacts the magnet 72 such that the lever element 49 is biased toward its middle position 39a as per FIG. 1.

(74) If the lever element 49, starting from the middle position 39a, is shifted into a working position 39b or 39c, the force of the magnet 71 as well as further forces generated by spring elements 73 and 74 must be overcome. But since the magnetic forces are only active within the immediate vicinity, just a little pivoting of the lever 49 about a very small pivot angle of e.g. 5° or 15° is sufficient in order to render the magnetic forces inactive. The magnets 71 and 72 are advantageously constructed and arranged in such a way that they are only active within a close range. In other words, the magnetic forces of the magnets 71, 72 become inactive, when the actuating lever 49 is in a position which is only a little remote from the middle position.

(75) It is noted at this point that the counter-magnet 72 may be an element which is fixed on the actuating lever 49. Alternatively a material portion or even the entire actuating lever 49 may consist of a magnetic or magnetizable material.

(76) As evident from FIG. 11 a first spring element 73 and a second spring element 74 are provided. The spring elements 73, 74 are each attached with a first spring end to a spring pivot point 75 on the second lever arm 79b or are attached to the lever 49 in another region thereof. The springs 73, 74 are configured as tension springs as shown in the embodiment of FIG. 11. Each of the spring elements 73, 74 therefore attempts to pull the actuating element 49 toward itself with the end of the second lever arm 79b. A stable balanced position is achieved if the lever 49 is in its middle position because the spring forces of the two spring elements 73, 74 cancel each other out.

(77) If starting from the middle position 39a the actuating lever 49 is shifted into the second working position 39c, the pivot point 75 moves away from the retained end 80 of the second spring element 74 so that the force exerted by the second spring element 74 upon the lever 49, i.e. the restoring force, increases. At the same time the spring pivot point 75 approaches the retained end 81 of the first spring element 73 so that no force is exerted by this spring element 73 upon the lever 49.

(78) Maintaining the switching position 39c therefore requires the operator to permanently exert a force upon the free end 62 of the lever 49 in direction 32 that is greater than the retaining force of the spring element 74.

(79) But since the spring element 74 (and similarly also the spring element 73) is designed to be very weak, this retaining force to be exerted by the operator may be designed to be very weak. This permits the operator to maintain the working position 39c by exerting only small retaining forces, i.e. at a high degree of comfort.

(80) As soon as the operator wishes to cancel the working position or switching position 39c, he can abruptly or gradually stop exerting force upon the lever 49 so that due to the force exerted by the spring element 74 the lever 49 shifted due to the force exerted by the spring element 74 is shifted as a result of a pivoting movement anti-clockwise about the pivot axis 65 in direction of its middle position 39a. The return of the lever 49 is initially ensured only by the spring 74.

(81) It is not until the lever 49 is approaching its middle position 39a, and magnet 71 and magnet 72 have again approached each other to the extent that the magnetic forces can become active, that the return movement of the lever 49 back into its middle position 3a accelerates/that this happens accompanied by the generation of a greater biasing force.

(82) The force components of the force exerted by the magnets 71, 72 and of the force exerted by the spring elements 73, 74 therefore add up/are connected in parallel. The forces exerted by the magnets 71, 72 albeit are only active at close range. Close range is understood therefore to mean the pivot positions of the actuating lever 49 that are close to its middle position 39a.

(83) As a result of the aforesaid and due to devising the force dimension for example in such a way that the magnetic forces of the magnets 71, 72 which are only active at close range are designed to be greater or higher than the forces exerted by the spring elements 73, 74, it can be ensured that the reached switching position 39b, 39c can be maintained with less effort and thus without becoming fatigued, and with more comfort.

(84) On the other hand, the user will be signaled in a distinctly tactile manner, due to the high magnetic forces effective at close range whose force effect also leads to a rather abrupt pivot movement of the actuating element 49, that the lever 49 has reached and will very shortly reach its middle position 39a.

(85) In other respects it should be noted that the computing unit or control unit 67 may also comprise a memory 67a which can be used to store or further process the set or changed parameter values.

(86) In the embodiment as per FIG. 11 two tension spring elements 73, 74 are described. In further embodiments of the invention only one spring element is described.

(87) Finally instead of tension springs, compression springs or leaf springs or other spring elements generating restoring forces may be provided.

(88) The critical factor is that at least one conventional first spring element becomes effective across the entire pivoting range between the middle position 39a and the respective switching position 39b, 39c, wherein the restoring forces increase along with increasing deflection of the actuating element, wherein this spring element is designed to be altogether weaker and that in parallel thereto a second spring element is provided that is only active at close range, and which generates restoring forces in particular with the aid of a magnet.

(89) With reference to FIGS. 12 to 19 a further embodiment of an operating element 15e for a communication station according to the invention will now be described.

(90) As evident from FIG. 12 the operating element 15 comprises a plurality of individual parts:

(91) To begin with FIG. 12 shows an element 49m which represents the actuating lever. This comprises a body 85 which has a recess 109 through which an adjustment element 59m rotatable about a rotary axis DA3 can be inserted. The body comprises two connecting pieces 86a, 86b or spigots which form a pivot bearing and which provide the pivot axis 65 of the actuating lever 49m.

(92) When assembled these pivot bearing connecting pieces 86a, 86b are mounted in openings 110a, 110b of side walls 83a, 83b, which openings are provided for this purpose. The side walls 83a, 83b together with a rear wall 83c form a swivel mounting 82 for the actuating lever 49m. The swivel mounting 82 is fixed relative to the housing front 13 of the communication station, in particular on the circuit board 94 shown in FIG. 13.

(93) In addition the corpus 85 has cam-shaped connecting pieces 99a, 99b on it that pass through curved link Slots 87a, 87b in the corresponding side wall 83a, 83b.

(94) As shown in FIGS. 16 to 18 depicting different pivoted positions of the lever element 49m, the link slots 87a, 87b limit the swivel movement of the lever 49m as a result of the connecting pieces 99a, 99b coming to a stop as they touch the ends of the link slots 87a, 87b.

(95) For completeness' sake it is noted that the pivot bearing connecting pieces 86a, 86b can be mounted in the respective housing side wall 83a, 83b with the aid of ball bearings 84a, 84b.

(96) As evident from FIG. 12 a magnet 96 is in addition provided which is fixed on, or relative to, the side wall 83a. FIG. 12 furthermore shows a pair of metallic levers 97a, 97b which are each pivotable about a lever swivel axis 98a, 98b. The two levers 97a, 97b are biased toward each other with the aid of a spring element 100.

(97) The connecting ends of the spring element 100 are marked with 101a and 101b.

(98) When the actuating lever 49m is in the middle position 39a as per FIGS. 15 and 17, the two driving cams 99a, 99b are positioned exactly centrally between the two levers 97a, 97b.

(99) When the lever 49m is deflected vertically from the middle position 39a as per FIG. 17 into a first switching position 39b as per FIG. 16, the driving cam 99a provided by the end of connecting piece 99a contacts the lower lever 97b, shifting the same anti-clockwise, with reference to FIG. 12, about the associated swivel axis 98b.

(100) As a result the free end of this lever 97b initially moves away from the immovably held magnet 96 that requires exerting a first force; this is necessary in order to overcome the magnetic holding forces between the magnets 96 and the metallic levers 97a, 99b which in particular consist of iron.

(101) As soon as the free end of the metallic lever element 97b has moved out of the range of influence of the magnet 96, it is only the (by comparison) weaker spring element 100 which attempts to tension the two lever elements 97a and 97b toward each other into their middle position. All the user needs to do in order to permanently hold the lever element 49m in its first switching position 39b as per FIG. 16 is to apply a force which counteracts the force of the spring element 100.

(102) In this case also the spring element 100 is insofar connected in parallel to the group consisting of magnet 96 and counter-magnet (formed by the metallic levers 97a, 97b).

(103) With this embodiment the magnet forces and the force of the mechanical spring 100 act in parallel in the immediate vicinity and as soon as the lever is deflected by a few degrees out of the middle position, only the mechanical forces of the spring element 100 remain effective.

(104) Insofar the lever 49m here also cooperates indirectly via the levers 97a, 97b with the magnet 96.

(105) The pair of mechanical lever elements 97a, 97b may be on the first side wall 83a or on the second side wall 83b or further alternatively also between the two side walls 83a, 83b. Advantageously the respective lever element 97a, 97b is directly mounted on the side wall 83a.

(106) The spring element 100 may for example be configured as a tension spring and in its two axial end regions comprise connecting regions 101a, 101b that can cooperate with counter attachment regions on the two lever elements 97a, 97b that are not shown in detail in the figures. The layout of spring element 100 and lever elements 97a, 97b may be such that the spring element 100 with its ends 101a, 101b can be hooked onto respective projections on the two lever elements 97a, 97b or be inserted or attached in some other manner.

(107) In the embodiment of FIGS. 12 to 19 the adjustment element 59m is configured as a rotary knob 88 and can be pivoted together with the actuating lever 49m.

(108) The rotary knob 88 sits on a connecting piece 89 of an encoder unit 108. The encoder unit 108 is an arrangement which apart from an encoder board 111 also comprises a pivot bearing for a rotatable encoder connecting piece 89.

(109) FIG. 12 also depicts a distance ring 90 indicated only in principle, which is to be between the encoder unit 108 and the actuating lever 49m.

(110) In addition the encoder unit 108 advantageously comprises a plug-in connector 92 that can be connected to a counter-plug-in connector 92b on the circuit board 94 of the communication station.

(111) Since the encoder unit 108 in this embodiment can be pivoted together with the actuating lever 49m, the plug-in connector is provided with a flexible conductor lead 112 that permits a certain space for movement.

(112) Several groups of LEDs 95a, 95b, 95c, 95d, 95e are provided on the circuit board 94, each of which can impact a light conductor 93a, 93b with light. The light conductor illuminates the operating element 15.

(113) A switching magnet 106 is fixed relative to the side wall 83b of the swivel mounting 82. This cooperates with Hall-effect sensors on the back of the encoder circuit board 111 that can detect the different working positions 39b, 39c of the actuating lever 49m relative to the side wall 83b.

(114) The two Hall-effect sensors that can be pivoted in common with the lever 49m, are marked with 113a, 113b in FIG. 19. The Hall-effect sensors 113a, 113b can ascertain a relative proximity to the fixed switching magnet 106 in the housing wall.

(115) A further embodiment of an operating element 15f of a communication station 10 according to the invention will now be explained with reference to FIGS. 20 to 25.

(116) In this embodiment according to FIG. 20, the lever element 49n is again provided with pivot bearing connecting pieces 86a, 86b that are mounted in side walls 83a, 83b of a swivel holder (or mounting) 82. The swivel holder 82 is fixed relative to a circuit plate or board 94 that corresponds to the housing front 13 of the communication station, or which may be in parallel to the same behind the housing front 13 as viewed in viewing direction of the observer in FIG. 21.

(117) Again each operating element 15f comprises an encoder unit 108 which is fixed on the circuit board 94. As with the previously described embodiment, a connecting piece 89 respectively extends away from the encoder unit 108, on which an adjustment element 59n in form of a rotary knob is positioned so as to be rotatable about a rotary axis DA4.

(118) In the embodiment as shown in FIGS. 20 to 25 the adjustment element 59n is fixed relative to the circuit board 13, i.e. it is not pivotable together with the lever 49n.

(119) To this end the lever 49n comprises a recess 114, through which the adjustment element 59n can pass.

(120) FIGS. 23 to 25 show different positions, in particular an inactive position/two working positions 39a, 39b, 39c of the lever element 49n relative to the adjustment element 59n, and they illustrate that the actuating lever 49n overreaches the adjustment element 59n, in all lever positions.

(121) The actuating lever 49n comprises a body 85 which has a driving cam 99a. This penetrates through a corresponding link slot 87a in the housing wall 83a.

(122) A spring element 103 is arranged immovably relative to the housing wall 83a that comprises two vertical holding arms 104a and 104b as well as a horizontal adjusting arm 105. A recess or receptacle 115 is in the horizontal adjusting arm 105, with the driving cam 99a engaging in this recess.

(123) The vertical arms 104a and 104b are arranged fixed relative to the housing wall 83a and fix the spring element 103 altogether to the housing side wall 83a.

(124) As the lever element 49n is pivoted from the inactive position as per FIG. 24 into a working position, the cam 99a describes a circular movement about the rotary axis 65, moving along the link slot. As it does so, it takes the adjusting arm 105 of the spring element with it, at the same time overcoming the restoring force exerted by the spring arm 105.

(125) At the same time a switching magnet 106 is shifted along as well, which is at the free end of the deflectable arm 105 of the spring element 103.

(126) In the deflected positions, i.e. when a working position of the lever element 49n is reached, the switching magnet 106 can cooperate with Hall-effect switches or Hall-effect sensors 113a, 113b that are on the circuit board 94. The deflected switching position 39b or 39c of the lever element 49n can be accordingly detected by the Hall-effect sensors 113a, 113b.

(127) As soon as the operator does no longer exert a force upon the lever element 49n, the spring element 103 ensures that the lever element 49n is returned into the middle position 39a as per FIG. 24.

(128) FIG. 20 in addition hints at a latching element 107 that can ensure that the lever element 49n can be arrested centrally in a mechanical manner:

(129) The latching element 107 may for example comprise spring projections 116a, 116b as best recognized in FIG. 22a that can for example cooperate with corresponding complementary surfaces, in particular recesses 117a, 117b on the pivot bearing connecting piece 86a recognizable in FIG. 22a, so that when the lever 49n reaches its middle position, this is indicated by a tactile signal from the latching mechanism.

(130) The embodiment in FIGS. 20-25 also ensures a particularly comfortable, reliable and error-free operation and actuation due to a direct and unequivocal spatially very close association of the adjustment element 59n with the corresponding actuating lever 49n.

(131) In all embodiments of the present patent application it may in addition be optionally provided that the adjustment element 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n is axially shiftable in direction of its respective rotary axis DA, DA1, DA2, DA3, DA4 and can perform a button function. The axial shift of the adjustment element 59 can be detected via a sensor element not shown in the figures.

(132) For example, by rotating the adjustment element 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n, a parameter value can be set, and the set parameter value can then be stored or accepted by means of buttons, i.e. by an axial shift of the adjustment element.

(133) The invention also covers the case in which an axial actuation of the adjustment element 59 must be first performed in order to be able to perform a setting of the parameter value by subsequently rotating the adjustment element 59a, 59b, 59c, 59d, 59e, 59f, 59g, 59h, 59i, 59j, 59k, 59l, 59m, 59n, and subsequently a button has be actuated again in axial direction in order to confirm or store or accept the parameter value.