Abstract:
An operating element, particularly for a motor vehicle, has a rotary actuator rotatable about a first axis and pivotable about at least one second axis, the rotary actuator being arranged on a rotary actuator support. The rotary actuator support is acted on by a rocker lever with a pretensioning force opposing a pivoting movement of the rotary actuator, and the rotary actuator can only be pivoted about the second axis after overcoming the pretensioning force.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is based on and hereby claims priority to International Application No. PCT/EP2013/000233 filed on January 26, 2013 and German Application No. 10 2012 004 116.0 filed on Mar. 1, 2012, the contents of which are hereby incorporated by reference. 
     
    
     BACKGROUND 
       [0002]    The invention relates to an operator control, particularly for a motor vehicle, comprising a rotary actuator which can rotate about a first axis, can pivot about at least a second axis and is arranged on a rotary actuator support. 
         [0003]    Such operator controls which have a rotary actuator are frequently used for user inputs if different functions are to be concealed by a single operator control. 
         [0004]    A rotary actuator is typically of cylindrical design and its axis of symmetry is at the same time the rotational axis. Manually rotating the rotary actuator causes switching signals to be generated which can control a menu, for example of a navigation device or of a car radio. Such a user interface, which can be activated by a rotary actuator, is also referred to as a multimedia interface (MMI). 
         [0005]    Rotary actuators can also be embodied as push and turn actuators, and in this variant a switching signal can be generated by an axial force, for example in order to confirm a menu item selected by turning the rotary actuator. 
         [0006]    Recently, rotary actuators with further functions have been used. In the case of a rotary actuator used by the applicant, a tilting function is additionally provided, i.e. manual deflection of the rotary actuator to the left or right, in order to switch incrementally from one menu item to the next. This advancing switching function, which is also referred to as a skipping function, is implemented by deflection of the rotary actuator to the left or the right by a few degrees angle. After the deflection, the released rotary actuator moves back automatically into the zero position. In order to give a sensation of high quality, this zero position must be very stable and virtually rigid. In this way, a large number of functions can be implemented with a single rotary actuator. For example, the tilting to one side can trigger switching to the next radio transmitter and tilting in the opposite direction can trigger switching to a preceding radio transmitter. By rotating the rotary actuator it is possible to increase or reduce the volume. Briefly pressing can switch the sound off or on. Pressing for a long time can switch the radio off or on. 
         [0007]    DE 10 2008 060 114 A1 discloses a multifunction operator control which is embodied as a push and turn actuator. Linear spring elements which are guided in tubes are provided under a cover. Such guidance always requires play, and for this reason the multifunction operator control cannot be mounted free of play. 
       SUMMARY 
       [0008]    One possible object is specifying an operator control which is mounted free of play. 
         [0009]    The inventors propose an operator control of the type mentioned at the beginning in which a prestressing force acting counter to a pivoting movement of the rotary actuator is applied to the rotary actuator support by a rocker lever, and the rotary actuator cannot be pivoted about the second axis until after the prestressing force has been overcome. 
         [0010]    The operator control device is based on the realization that a quasi-play-free rotary actuator can be implemented by virtue of the fact that lateral deflection does not start until a defined force threshold has been overcome. The rotary actuator is held prestressed about its zero position by a prestressing force and as a result is absolutely free of play and wobble-free. In contrast to all known conventional operator controls, in this way play and “wobbling” about the zero position can be avoided. 
         [0011]    Within the scope of the proposal it is possible to provide that the rocker lever bears on the rotary actuator support in a linear or planar fashion. The rotary actuator and the rotary actuator support are expediently firmly connected to one another, wherein the rotary actuator is preferably embodied as a cylindrical operator control knob which is rotatably arranged on the rotary actuator support. The rotary actuator support is usually concealed in the installed state. 
         [0012]    It is also possible to provide that the operator control has a spring element for generating the prestressing force acting on the rocker lever. The spring element is supported here at one end on a component fixed to the vehicle bodywork and at the other end to the rocker lever. Tilting or pivoting of the rotary actuator cannot be triggered until after the prestressing force has been overcome. The prestressing force therefore constitutes a force threshold which has to be overcome, as a result of which the zero position is absolutely free of play. 
         [0013]    According to a first refinement of the operator control, the rotational axis of the rocker lever can be arranged coaxially with respect to the longitudinal axis of the rotary actuator support. In this variant, the rotational axis of the rocker lever is arranged parallel to the longitudinal axis of the rotary actuator support and the prestressing force which is transmitted by the rocker lever acts perpendicularly on the rotary actuator support. 
         [0014]    In this context, it is favorable if the rocker lever of the operator control acts on the rotary actuator support above and below the second axis. As a result, the prestressing force can counteract a tilting movement in the two opposite directions. 
         [0015]    According to one alternative refinement, the rocker lever can be arranged above or below the rotary actuator support. In this variant, the rocker lever also counteracts a pivoting movement about the second axis in the two opposite directions. 
         [0016]    One development can be provided in which the rotary actuator can additionally be pivoted about a third axis which is perpendicular to the first and second axes. In this refinement, the rotary actuator cannot only be tilted in two opposite directions but additionally it can be tilted in two directions perpendicular thereto, i.e. the rotary actuator can be tilted or pivoted in 90° steps about its perpendicular axis. 
         [0017]    If tilting about the third axis is provided, the operator control can have two rocker levers which apply a prestressing force to the rotary actuator support. The two rocker levers can preferably be rotated about rotational axes which are orthogonal with respect to one another. A spring element can act on each of the two rocker levers in order to generate the prestressing force. 
         [0018]    In addition, the inventors propose a motor vehicle, and the motor vehicle has at least one operator control of the type described. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    These and other objects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which: 
           [0020]      FIG. 1  shows a proposed operator control in a perspective view; 
           [0021]      FIG. 2  shows a side view of the operator control shown in  FIG. 1 ; 
           [0022]      FIG. 3  shows the operator control from  FIG. 1  in the deflected state; 
           [0023]      FIG. 4  shows the operator control from  FIG. 1  in the case of the deflection in the opposite direction; 
           [0024]      FIGS. 5 and 6  show a second exemplary embodiment of the proposed operator control; 
           [0025]      FIGS. 7 and 8  show a third exemplary embodiment of the proposed operator control; 
           [0026]      FIG. 9  shows a fourth exemplary embodiment of the proposed operator control; 
           [0027]      FIG. 10  shows the rocker levers of the operator control from  FIG. 9 ; and 
           [0028]      FIG. 11  shows a sectional side view through the operator control from  FIG. 9 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0029]    Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
         [0030]    The operator control  1  shown in a perspective view in  FIG. 1  comprises a rotary actuator  2  which is embodied as a cylindrical rotary knob and is permanently connected to a rotary actuator support  3 . The rotary support  2  is rotatably mounted on the rotary actuator support  3 , and during the manual rotation of the rotary actuator  2  switching signals are generated which are processed by a control device, as a result of which operator commands can be input. The operator control  1  comprises a cover  4 , with the result that the rotary actuator support  3  is concealed in the installed state. 
         [0031]    The rotary actuator support  3  is of square design, and a prestressing force is applied to a side faces of the rotary actuator support  3  by a rocker lever  6 . The prestressing force is generated by a spring element  7  which is supported at one end on the vehicle bodywork or on a component connected thereto and at the other end on the rocker lever  6 . An arrow  8  indicates the direction of the prestressing force generated by the spring element  7  and therefore acts orthogonally on the side face  5  of the rotary actuator support  3 . As is shown in  FIG. 1 , the rocker lever  6  has a projection  9  on the side facing the rotary actuator support  3 , with the result that the rocker lever  6  bears linearly on the rotary actuator support  3 . 
         [0032]    The rocker lever  6  can pivot about a rotational axis  10  which is arranged coaxially with respect to the longitudinal axis of the rotary actuator support  3 . The rotary actuator support  3  can pivot about a rotational axis  11  which is orthogonal with respect thereto. In  FIG. 1  it is apparent that the rocker lever  6  acts on the rotary actuator support  3  both above and below the rotational axis  11 . 
         [0033]    The rotary actuator  2  of the operator control  1  can rotate about its longitudinal axis  12  (first axis) and can pivot about the rotational axis  11  (second axis). Pivoting is possible in two opposite directions, which is symbolized by the two arrows  13 ,  14 . 
         [0034]      FIG. 2  shows the operator control  1  in a side view in which it is clear that the prestressing force generated by the spring element  7  is applied to the rotary actuator support  3  in the direction of the arrow  8  via the rocker lever  6 , and in this way the prestressing force is applied to said rotary actuator support  3  in a linear form above and below the rotational axis  11  of said rotary actuator support  3 . 
         [0035]      FIG. 3  shows the operator control  1  during deflection in the direction of the arrow  13 . If the user manually applies a force acting in the direction of the arrow  13  to the rotary actuator  2  and the rotary actuator support  3  connected thereto, the rotary actuator support  3  is pivoted about its rotational axis  11 . The rotary actuator support  3  moves the rocker lever  6  laterally for a certain distance As. Before movement, the counteracting prestressing force firstly has to be overcome. The rotary actuator support  3  is therefore not pivoted until after a predefined force level, which can be set or adapted by the spring element  7 , has been overcome. When the rotary actuator  2  is released, the operator control  1  turns back under the influence of the prestressing force, into its zero position shown in  FIG. 2 . 
         [0036]      FIG. 4  shows the deflection of the operator control  1  in the opposite direction. If the rotary actuator  2  is moved in the direction of the arrow  14 , the rotary actuator support  3  pivots about its rotational axis  11  and presses, with its lower part, the rocker lever  6  to the side, on the left in the view shown in  FIG. 4 . In this context, the prestressing force must firstly be overcome. In the zero position, the bearing is absolutely free of play since rotation or pivoting of the rotary actuator support  3  is not triggered until when the prestressing force is overcome. 
         [0037]      FIGS. 5 and 6  show a second exemplary embodiment of an operator control  15 , wherein  FIG. 5  shows the operator control in the zero position, and  FIG. 6  shows the operator control in the deflected state. 
         [0038]    In contrast to the preceding exemplary embodiment, the rotary actuator support  16  has a plate  17  on its underside, with the result that the rotary actuator support  16  which is permanently connected to the plate  17 , can pivot about a horizontal rotational axis  18 . A rocker lever  19  acts on the plate  17  on its underside, said rocker lever  19  generating a prestressing force which acts in the direction of the arrow  20 . 
         [0039]    As is shown in  FIG. 6 , the rotary actuator support  16  is pivoted about its rotational axis  18  during a deflection in the direction of the arrow  21 , and in the process one end of the plate  17  presses the rocker lever  19  downward out of the zero position shown in  FIG. 5 , counter to the prestressing force in the direction of the arrow  22 . However, the rotary actuator support  16  is not pivoted until after the force threshold, i.e. the prestressing force, has been overcome. The embodiment shown in  FIGS. 5 and 6  therefore also has a play-free zero position. 
         [0040]      FIGS. 7 and 8  show a third exemplary embodiment of an operator control  23  which is of a similar design to the preceding exemplary embodiment. In contrast to this, the operator control  23  has, however, a rocker lever  24  which is arranged on the upper side of the plate  17 . Accordingly, when the operator control  23  pivots out of the stable zero position counter to the restoring force  25 , the rocker lever  24  is moved upward by the plate  17 . The rocker lever  24  is concealed under a cover (not illustrated) here. 
         [0041]      FIGS. 9 to 11  show a fourth exemplary embodiment of an operator control  26  which is shown in a side view in  FIG. 9 . The rotary actuator  2  of the operator control  26  can, similarly to a joystick, be actuated in four directions which are each offset from one another by 90°. Two rocker levers  27 ,  28 , which are shown in a perspective view in  FIG. 10 , are provided underneath the rotary actuator support  16 . The two rocker levers  27 ,  28  can rotate about two rotational axes  29 ,  30  which are orthogonal with respect to one another. A spring element, which respectively generates a prestressing force, is applied to each rocker lever  27 ,  28 . 
         [0042]    The rocker levers  27 ,  28  are embodied in such a way that they can be activated independently of one another, i.e. when the rotary actuator  2  is activated in such a way that the rocker lever  27  is pivoted out of its zero position, the position of the other rocker lever  28  is not changed, and vice versa. 
         [0043]      FIG. 11  shows the operator control  26  in a side view which is rotated through 90° with respect to the illustration in  FIG. 9 . 
         [0044]    All the exemplary embodiments explained have in common the fact that the rocker lever which has the function of a pressing plate carries out a play-free linear movement by virtue of its rotational bearing. As a result, the zero position of the rotary actuator is absolutely free of play, as a result of which an impression of high quality is generated by the operator control. 
         [0045]    The invention has been described in detail with particular reference to preferred embodiments thereof and examples, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention covered by the claims which may include the phrase “at least one of A, B and C” as an alternative expression that means one or more of A, B and C may be used, contrary to the holding in  Superguide v. DIRECTV,  69 USPQ2d 1865 (Fed. Cir. 2004).