Abstract:
A trigger sensor can trigger an electric furniture drive depending on a movement of the furniture part to be driven by the furniture drive caused by a user. The trigger sensor includes at least one actuator which can be moved by the furniture part into an assembly position, and the trigger sensor can capture movements of the furniture part along at least two directions which are orthogonal to each other. The trigger sensor has at least one actuator which captures each of the at least two directions.

Description:
This application is a Continuation of International application No. PCT/AT2009/000458, filed Nov. 25, 2009, the entire disclosure of which is incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention concerns a trigger sensor for triggering an electric furniture drive based on a movement caused by a user of the furniture part to be driven by the furniture drive. The trigger sensor has at least one actuating member movable in the mounted position by the furniture part. 
     Trigger sensors are shown in various different design configurations in AT 413 472 B. Thus, for example, FIG. 17 shows a trigger sensor having a potentiometer actutable by an actuating member, the actuating member being integrated in the ejection lever of the furniture drive. For that purpose, the ejection lever is of a two-part configuration, the two lever parts being prestressed relative to each other by a spring. 
     FIG. 18 shows another embodiment in which the trigger sensor is fixed separately from the furniture drive to the furniture carcass. Here the actuating member of the trigger sensor is in the form of a spring-loaded push rod cooperating by way of a rack with a pinion of a potentiometer. The precise structure of that trigger sensor is shown in FIG. 19. 
     The above-discussed trigger sensors suffer from the disadvantage that they are each sensitive only to movements of the furniture part in a single predetermined direction. That direction is the specific direction in which the furniture part is movably mounted. If the furniture part is especially in the form of a drawer, the problem arises precisely in relation to very wide drawers which are of a small internal depth, that a trigger sensor which is sensitive only to the predetermined direction of movement of the furniture part does not permit reliable triggering of the furniture drive, particularly when the situation involves the manual application of pressure to the front panel of the drawer in one of the edge regions. In that case, more specifically, only a negligible depthwise movement of the furniture part parallel to the side walls of the furniture carcass is made possible by the force applied from the exterior by the user. Instead, that primarily involves a rotary movement of the furniture part, and that movement cannot be detected by the trigger sensor. That problem can also arise in relation to other furniture parts such as, for example, furniture doors or furniture flaps. 
     DE 10 2006 008 505 A1 discloses a trigger sensor having the features of the classifying portion of the present invention. 
     SUMMARY OF THE INVENTION 
     The object of the invention is to ensure reliable triggering of a furniture drive even in the above-discussed situations, wherein the invention seeks to provide that the trigger sensor has a simpler and less expensive structure than DE 10 2006 008 505 A1. 
     That object is attained by a trigger sensor having the features of the present invention, and an article of furniture having the features of the present invention. 
     The use of a trigger sensor which in itself is suitable for detecting movements of the furniture part along at least two directions which are mutually orthogonal makes it possible to ensure triggering of the furniture drive even when using a single trigger sensor without the use of complicated and expensive multi-axis acceleration sensors. 
     For the specific situation where the movable furniture part is a drawer which is mounted in a furniture carcass in such a way that it can be extended, it may even be sufficient under some circumstances if it is only provided that a movement of the furniture drive is monitored in a direction orthogonal to the extension direction. That can be effected for example in such a way that a trigger sensor, in accordance with the above-described state of the art, is either arranged at a side wall of the furniture carcass or is arranged at the rear side of the furniture carcass, and in that case cooperates with an abutment which extends in the extension direction and which is arranged on the furniture part. 
     The measures according to the invention are suitable in particular for use in relation to all electrically driven furniture parts in which there is either a storage space for filling items which can be introduced thereinto or removed therefrom (for example drawers) or which openably close such a storage space (for example flaps, doors). 
     Further advantageous embodiments are defined in the respective appendant claims. 
     A particularly simple configuration of the actuating member is afforded if it is provided that the actuating member is in the form of an articulated lever having two articulation arms movable relative to each other. In itself, it may be sufficient if the two articulation arms are mounted limitedly movably to each other for example by a flexural joint. Particularly preferably, however, it is provided that the articulation arms are connected together by a rotary joint. 
     In each of the described embodiments it can be provided that the actuating member cooperates with a potentiometer by way of an output drive. It will be appreciated that triggering can also be effected in a different manner than by a potentiometer. Other examples are the use of optical or magnetic encoders which can also be coupled to the output drive. 
     It can be provided in each embodiment that the furniture drive has a control or regulating device which is in signal relationship with the at least one trigger sensor. The control or regulating device can have a drive module which serves to control or regulate the electric drive unit. The electric drive unit can be for example in the form of an electric motor. 
     Other examples of movable furniture parts, besides drawers, are also furniture flaps and furniture doors. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages and details of the invention will be apparent from the specific description and the accompanying Figures in which: 
         FIG. 1  is a perspective view showing a portion of the rear side of a furniture carcass with a furniture part mounted movably therein, 
         FIGS. 2   a ,  2   b ,  2   c  show a first embodiment of a trigger sensor according to the invention, 
         FIGS. 3   a ,  3   b ,  3   c  show a second embodiment of a trigger sensor according to the invention, 
         FIG. 4  shows a trigger sensor cooperating with an inclined plane, 
         FIG. 5  shows an overall view of an article of furniture with a trigger sensor according to the invention, and 
         FIGS. 6   a  through  6   e  show various trigger situations. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is a partial view showing the front side and a side wall of a movable furniture part  3  in the form of a drawer, having a front panel  3 ′. The furniture part  3  is mounted in a furniture carcass  7  of which also only a part is shown, in such a way that it can be pushed in and pulled out. The coordinate system used hereinafter is represented in the form of a three-legged arrow. That direction along which the movable furniture part  3  is mounted in such a way that it can be pulled in and out is referred to as the x-direction. The y-direction extends parallel to the rear side to the furniture carcass  7 . The z-direction extends at a right angle to those two directions, that is to say along the heightwise extent of the furniture carcass  7 . 
     As already stated, it was only possible to detect movements along the x-direction with the previous trigger sensors. The invention makes it possible also to detect such movements of the furniture part  3 , which have components greater than zero (i.e., at least some movement) along at least two of the orthogonal directions x, y, z. 
       FIG. 2  shows three views illustrating a first embodiment of the invention with an actuating member  4  in the form of an articulated lever. The rear side of the furniture carcass  7  has been removed to allow a view of the trigger sensor  1 . The actuating member  4  has two articulated arms  5   a ,  5   b  which are hingedly connected (linked) together by way of a non-statutory rotary joint  5   c  to form an articulated lever having a base end and a distal end, with the joint  5   c  located between the base end and the distal end. The first articulated arm  5   a  cooperates with an abutment  8  arranged on the furniture part  3 , and the second articulated arm  5   b  is in one piece with (integrally connected to) an output drive  6  rotatably attached to furniture drive  2 . The output drive  6  cooperates with a potentiometer (not shown in greater detail) by way of a drive wheel  9 . The trigger sensor  1  is here arranged directly on the furniture drive  2 . As illustrated in  FIGS. 2   b  and  2   c , the base end of the articulated lever is the end of second arm  5   b  rotatably mounted to the furniture drive  2 , and the distal end of the articulated lever rests against abutment  8 . 
     Basically two trigger functionalities can be provided. In the one trigger functionality, the potentiometer already triggers the furniture drive  2  when the drive wheel  9  begins to move. With the other trigger functionality, the potentiometer must first receive a predetermined number of revolutions of the drive wheel  9  before triggering of the furniture drive  2  is effected. In that case, therefore, triggering occurs only after a given distance has been covered. 
     As can be seen in particular from  FIGS. 2   b  and  2   c , the two articulated levers  5   a ,  5   b  are acted upon relative to each other by a spring  10 . That arrangement provides that the articulated lever  5   a  is biased in relation to the articulated lever  5   b  in an articulation position, more specifically in such a way that, without an external force acting thereon, it assumes the position shown in  FIG. 2   c.    
     That prestressing effect provides that the actuating member  4  is moved, on the one hand, upon a pure movement of the furniture part  3  in the x-direction. On the other hand, it provides that a movement of the furniture part  3  in the y-direction also causes a movement of the actuating member  4 , which improves the triggering sensitivity of the trigger sensor  1  according to the invention in comparison with the state of the art. Therefore triggering of the furniture drive  2  can be implemented by both movements. 
     In  FIG. 2   b , the furniture part  3  is in its fully closed end position. Even in the fully closed end position there still remains a push-in travel for the furniture part  3 , which can be ensured in a per se known manner by spring buffers (not shown). In  FIG. 2   c , in comparison with  FIG. 2   b , the furniture part  3  has been laterally pushed in by hand by a user (for example as shown in  FIG. 6   b ). The resulting movement of the actuating member  4  which is transmitted by way of the output drive  6  to the drive wheel  9  of the potentiometer is registered by the trigger sensor  1  and fed to the furniture drive  2  for triggering thereof. 
     The illustrated configuration of the actuating member  4  provides that triggering of the furniture drive  1  can be registered not only upon a movement in the x-direction but also upon a movement in the y-direction (see  FIG. 6 ). 
     The embodiment of the invention shown in  FIG. 3  differs from that in  FIG. 2  in that the actuating member  4  is installed at an incline in the furniture carcass  7 , that is to say it extends not only in the x- and y-direction but also in the z-direction. That configuration means that movements of the furniture part  3 , which have a component in the z-direction, can also be detected. As can be seen in particular from  FIG. 3   b  the output drive  6  for the drive wheel  9  of the potentiometer has a bent configuration for that purpose. 
     Unlike the situation shown in the Figures, a trigger sensor  1  according to the invention can also be arranged separately from the furniture drive  2  on the furniture carcass  7  or on the furniture part  3  and can be in a signal-transmitting relationship therewith. It is also possible to provide two or more furniture drives  2  for driving the same furniture part  3 . The trigger sensor  1  and the abutment  8  can also be arranged laterally on the furniture carcass  7  or on the movable furniture part  3  respectively. The furniture drive  2  can have, for example, a conventional electric motor and can be designed for example precisely as in one of  FIG. 3   a ,  4   a  or  5   a  of WO 2006/113947 A1. Other configurations for the furniture drive  2 , for example being constantly connected to the furniture carcass  7  and the furniture part  3  (see for example EP 1 374 732 A1) are also conceivable. 
     Driving of a furniture part  3  by a furniture drive  2  according to the invention can be limited to the furniture part  3  being moved out of the closed end position in or on the furniture carcass  7  only to such an extent that a user can engage the furniture part  3  by hand and can manually move it further (initial push aid). 
       FIG. 4  shows a trigger sensor  1  cooperating with an abutment  8  which is in the form of an inclined plane and which here is arranged on the furniture part  3  and oriented at an angle with respect to output drive  6 . The actuating member  4  of the trigger sensor  1  is here in one piece. The sensitivity of the trigger sensor  1  that is required according to the invention, along at least two directions x, y, z which are orthogonal to each other, is achieved here solely by the part of the inclined plane which extends at an incline (having components in the x- and y-directions). 
     Lines for the electric power supply and signal transmission have not been shown. 
     Quite generally, it can be said that the trigger sensor  1  according to the invention reacts sensitively in relation to at least two mutually orthogonal directions of movement x, y, z of the furniture part  3 .