Abstract:
A dual function air-gap switch actuator ( 26 ) is incorporated into the generally planar face of a wall box dimmer. The switch actuator is finger operated and provides both a main power disconnect via air-gap contacts ( 211 ) and the means ( 212 ) to activate a secondary function. The dual function air-gap switch actuator is optionally fitted with an indicator lamp ( 265 ).

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Technical Field 
         [0002]    This invention relates to wall box mounted lighting dimmers and more particularly relates to a dimmer having a bezel kit with a dual function air-gap switch and configurable buttons. 
         [0003]    2. Background Art 
         [0004]    Wall box dimmers are well known and frequently have a triac, a silicon controlled rectifier (SCR), a field effect transistor (FET), or any other controllably conductive semiconductor structure that is operable to deliver variable power to a lighting load. The controllably conductive device is frequently provided with an on/off control actuator and a dimmer level control actuator mounted in and operable from the front surface of the dimmer. It is required, in order to be “UL listed”, to also provide a dual function air-gap switch actuator, which can be located in and operated from the same front surface of the device to provide a definite disconnect of the alternating-current (AC) power from the lighting load, independent of the off-time of the controllably conductive power device. 
         [0005]    It is very desirable to organize the control actuators on the front surface of the dimmer to present an attractive smooth and uncluttered appearance while also being easy to configure with various combinations of buttons to allow ready customization. 
         [0006]    The inventors have discovered that it would also be very desirable to utilize a required air-gap switch to provide additional functionality when it is not being used to interrupt an external AC load and to even combine a “night-light” feature into such a switch. 
       SUMMARY OF THE INVENTION 
       [0007]    It is to be understood that both the general and detailed descriptions that follow are exemplary and explanatory only and are not restrictive of the invention. 
         [0008]    A first object of the present invention is to provide a wall box dimmer with a generally planar face that comprises an enclosure and a removable bezel kit that further includes a dual function air-gap switch actuator that is operable by the user to initiate a secondary function. The enclosure contains a pair of air-gap contacts that are mechanically co-operable with the function air-gap switch actuator which is adapted to open and close these contacts. The bezel kit further includes a bezel and at least one primary function button that is operable by a user. 
         [0009]    A second object of the present invention is provide a wall box dimmer having a generally planar face and adapted to mount behind a faceplate. The dimmer includes an enclosure, a pair of cooperating air-gap contacts configured as a micro-switch mounted within the enclosure, and a removable color matched bezel kit including components protruding through an opening in the faceplate. The bezel kit further includes a bezel, a dual function air-gap switch actuator configured as a lever, and a vertical column of light emitting diodes. The dual function air-gap switch is mechanically co-operable with the pair of air-gap contacts and operates to open and close these contacts. The bezel kit is configured to allow various sized buttons to be snapped into the bezel prior to attachment with the dimmer enclosure. The air-gap contacts are adapted to open when the bezel kit is separated from the dimmer enclosure. The dual function air-gap switch actuator is further adapted to be operable by the user to initiate a secondary function. 
         [0010]    A third object of the present invention is provide a lighting system that includes a centralized lighting controller, a plurality of lighting loads, and a plurality of dimmers where each of the dimmers is associated with a corresponding lighting load. Each of the dimmers further includes a dual function air-gap switch that alternatively functions to physically connect and disconnect the dimmer with its corresponding lighting load and to initiate a predetermined function. 
         [0011]    Finally, a fourth object of the invention is to provide a method for setting a brightness schedule for a wall box dimmer. This method includes the steps of providing a rocker actuator having a command-up portion and a command-down portion, providing a dual function air-gap switch, inputting a command to manually set the brightness level to a desired brightness level, and activating a secondary function of the dual function air-gap switch to store the desired brightness level in the brightness schedule. The dual function air-gap switch provides primary function which operates to physically connect and disconnect the wall box dimmer with a corresponding lighting load and a secondary function which operates to active an internal program function. The step of inputting a command to manually set the brightness level to a desired brightness level is accomplished by depressing the command-up portion of the rocker actuator in a first fashion. 
         [0012]    The present invention seeks to overcome or at least ameliorate one or more of several problems, including providing secondary functions with adding additional switches to the face of a wall mounted dimmer. 
       DISCLOSURE OF INVENTION 
       [0013]    To solve the aforementioned problem, a physical air-gap switch mechanism is provided, to be activated in special circumstances when an air-gap is needed. As activating the air-gap switch is not a typical behavior, it is advantageous to give this switch a secondary function since it is already occupying available space of the face of the dimmer. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0014]    The accompanying figures further illustrate the present invention. 
           [0015]    The components in the drawings are not necessarily drawn to scale, emphasis instead being placed upon clearly illustrating the principles of the present invention. In the drawings, like reference numerals designate corresponding parts throughout the several views. 
         BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0016]      FIG. 1  is a perspective view of a wall box dimmer (with a decorative faceplate shown) and showing the novel dual function air-gap switch actuator in the closed “power on” position. 
           [0017]      FIG. 2  is a wireless lighting system having a centralized lighting controller and incorporating the inventive wall dimmer of the present invention. 
           [0018]      FIG. 3  a front view of the wall box dimmer shown in  FIG. 1 . 
           [0019]      FIG. 4  further illustrates wall box dimmer of  FIG. 1  showing the novel dual function air-gap switch actuator in the open “power off” position. 
           [0020]      FIG. 5  further illustrates the dual function nature of the inventive switch actuator by depicting a second illustrative embodiment of the present invention. 
           [0021]      FIG. 6  schematically depicts certain electrical elements of the wall box dimmer shown in  FIG. 1  according to one illustrative embodiment of the present invention. 
           [0022]      FIG. 7  depicts timing diagrams for several example commands operable for certain embodiments of the present invention. 
           [0023]      FIG. 8  depicts an embodiment of the inventive wall box dimmer having a single primary function button. 
           [0024]      FIG. 9  depicts an embodiment of the inventive wall box dimmer having a two primary function buttons. 
           [0025]      FIG. 10  depicts an embodiment of the inventive wall box dimmer having a four primary function buttons. 
       
    
    
     LIST OF REFERENCE NUMBERS FOR THE MAJOR ELEMENTS IN THE DRAWING 
       [0026]    The following is a list of the major elements in the drawings in numerical order.
         20  wall box dimmer(s)     21  enclosure (part of dimmer  20 )     22  removable bezel kit (part of dimmer  20 )     23  bezel (part of bezel kit  22 )     24  primary function button (part of bezel kit  22 )     25  vertical column of light emitting diodes (LED)     26  dual function air-gap switch actuator     31  faceplate     32  electrical wall box     41  centralized lighting controller     42  lighting load(s)     51  example first command—single increment increase (decrease) brightness     52  example second command—full brightness (dim)     53  example third command—step through increasing (decreasing) brightness increments     54  example fourth command—manually set continuous increasing (decreasing) brightness     211  air-gap contacts (main power disconnect)     212  secondary function switch (mounted within enclosure  21 )     215  dimmer “up” switch (activated by primary function button  24 )     216  dimmer “down” switch (activated by primary function button  24 )     241  primary function button (single=1)     242  primary function button(s) (dual=2)     244  primary function button(s) (quad=4)     254  alternate LEDs (corresponding to buttons  244 )     261  first end portion (of dual function air-gap switch actuator  26 )     262  second end portion (of dual function air-gap switch actuator  26 )     265  indicator lamp (integral to switch actuator  26 )       
 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0053]    The present invention is generally implemented as part of a wall box dimmer. Hence, an illustrative dimmer system and its operation will be described initially. 
         [0054]    Unless the context clearly requires otherwise, throughout the description and the claims, the words ‘comprise’, ‘comprising’, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. 
       MODE(S) FOR CARRYING OUT THE INVENTION 
       [0055]    The preferred embodiment of the present invention is described herein in the context of a wall box mounted dimmer, such as one that might be found in a residence, but is not limited thereto, except as may be set forth expressly in the appended claims. 
         [0056]    Referring first to  FIG. 1 , there is shown a wall box dimmer  20 , which has a generally planar bezel of any suitable material such as molded plastic and an enclosure  21  which includes various electronics components. According to the present invention, the bezel is actually a subcomponent of a removable bezel kit  22 , which also other components which will be described below. 
         [0057]    The wall box dimmer  20  is typically installed in an electrical wall box  32  as is well known to those skilled in the art of residential and commercial construction. The dimmer bezel extends through an opening in a faceplate  31 . Those skilled in the art will recognize that faceplate  31  may be further comprised of a mounting plate portion and a snap-connect decorative faceplate portion. All of these parts can be manufactured from molded plastic. 
         [0058]      FIG. 2  depicts a lighting system, such as might be used in either a small commercial or large residential installation, and which includes the inventive dimmer of the present installation. A centralized lighting controller  41  communicates with several wall box dimmers, such as the present inventive dimmer  20 . Each of the dimmers  20  is associated with and controls a corresponding lighting load  42  and also provides an air gap switch to physically connect and disconnect the dimmer  20  with its corresponding lighting load  42 . In certain embodiments, the centralized controller  41  is hard-wired to each of the dimmers  20  and in other embodiments; the dimmers intercommunicate with one another and the centralized controller  41  using a wireless mesh network wireless mesh network. 
         [0059]    Advantageously, the additional secondary function added to the air-gap switch can be used to synchronize communications between the various lighting system components shown in  FIG. 2 . 
         [0060]      FIG. 3  illustrates further detail of the components that comprise bezel kit  22 , according to one embodiment of the present invention, as seen through the faceplate  31  such as in a typical residential installation. A primary dimming function for wall box dimmer  20  is activated by an operator using primary function button  24 , such as for example a rocker actuator. Operator feedback, such as button status, dimming level, wireless network signal, or lighting system environmental ‘green’ level is indicated by a vertical indicator, such as a vertical column of light emitting diodes  25 . The dual function air-gap switch actuator  26  allows for physical disconnect of the lighting load as described previously. In one embodiment of the present invention, the operator can depress a first end portion  261  of dual function air-gap switch actuator  26  to activate a secondary function, such as setting a default dimming schedule. 
         [0061]    Refer now to  FIG. 4  which shows a dual function air-gap switch actuator  26  in the open, power “OFF” position in accordance with one illustrative embodiment of the present invention. In this embodiment, the air-gap contacts internal to dimmer enclosure  21  are configured as a micro-switch which is opened and closed by rotary motion of air-gap switch actuator  26 . Advantageously, in this embodiment, separating the bezel kit  22  from the enclosure  21  causes the air-gap contacts to open thereby protecting the user from exposure to potentially live electrical components. 
         [0062]    In a preferred embodiment, the dual function air-gap switch actuator  26  is implemented as a small horizontal lever has been designed which, when rotated in one direction, opens a micro switch which physically disconnects the lighting load from the alternating current (AC) line. This lever sits directly below the device&#39;s buttons, and blends in aesthetically. 
         [0063]      FIG. 5  further illustrates the dual function nature of the inventive switch actuator by depicting a second illustrative embodiment of the present invention. In this embodiment, the air-gap contacts  211  are conductively connected through the air-gap switch actuator  26  and are opened and closed by an operator grasping and pulling on the first end portion  261  of the dual function air-gap switch actuator  26  in a rotary fashion. A depression of a second end portion  262 , of the dual function air-gap switch actuator  26 , in a linear fashion activates a secondary function switch  212 , mounted within enclosure  21 . In other embodiments, the secondary function is activated by depressing the first end portion  261  of the dual function air-gap switch actuator  26  in a linear fashion. Significantly, the full front appearance of the entire assembly (with the dual function air-gap switch actuator  26  in the closed “power on” position and the internal dual function air-gap switch closed) is that of a substantially flat uncluttered surface. (See for example, the substantial planarity of the front surface in  FIG. 1 ). 
         [0064]    Other embodiments incorporate different configurations of air-gap contacts and different switch configurations for activating the secondary function. Advantageously, the secondary function is provided without requiring additional awkwardly placed switches or the like. This secondary function can include a number of functions, including but not limited to: (a) an internal software reset, (b) providing a “save” functionality when tapped to allow the end user to adjust stored lighting preset levels, or; (c) providing a synchronization function with a centralized lighting controller. 
         [0065]      FIG. 6  depicts certain electrical elements of the inventive wall box dimmer  20  for one embodiment which incorporates a rocker actuator primary function button  24 . This primary function button  24  can be alternately operated to depress either a dimmer “up” switch  215  or a dimmer “down” switch  216 . The dual function air-gap switch actuator  26  can be alternately operated to either depress a secondary function switch  212  or to open and close air-gap contacts  211 . Also shown is a vertical column of light emitting diodes (LED)  25 . In a further embodiment of the present invention, an indicator lamp  265 , such as a high efficiency LED lamp is incorporated into the dual function switch actuator  26 . 
         [0066]    Refer now to  FIG. 7  and continue to refer to  FIG. 6 . A timing diagram associated with one illustrative embodiment of the present invention is provided to describe several example commands executed by dimmer  20 . The reference characters “S1”, “S2”, “S3”, “S4”, and “S5” indicate a set of internal states that can be used to determine the particular desired command in accordance with an illustrative embodiment of the present invention. 
         [0067]    Four example commands, operable from the dimmer “up” switch  215 , are shown. The example first command  51  consists of a short single tap (i.e. “single-click”) on the dimmer “up” switch  215  and acts to increase the brightness of a controlled lighting load to the next programmed increment. An example second command  52  consisting of a short double tap (i.e. “double-click”) acts to increase the controlled lights to their maximum brightness. An example third command  53  consisting of a continuous depression of the dimmer “up” switch  215  causes the brightness to step through a sequence of programmed brightness levels, such as at a rate of ten (10) brightness levels per second. 
         [0068]    Finally, an example fourth command  54  consisting of a single short tap immediately followed by continuous depression causes the brightness to continuously increase through all brightness levels at a predetermined rate. In this embodiment, a short depression of the dual function air-gap switch actuator  26  (i.e. “single-click”) activates the secondary function which in turn causes the manually set brightness level to be added to the programmed sequence of brightness levels. In this embodiment, the dimmer “down” switch  216  switch operates in an analogous manner. 
         [0069]      FIGS. 8 ,  9 , and  10  illustrate several embodiments of the inventive dimmer in which various configurations of buttons have been incorporated into the bezel kit  23 . Advantageously, the particular button configuration can be altered without removing the wall box dimmer  20  from the electrical wall box  31 , shown in  FIG. 1 . Changing button configurations is accomplished by simply removing the bezel kit and changing out the buttons. 
         [0070]    The button functions, with the exception of the air-gap switch contacts, are all software configurable. For example, in certain embodiments, multiple secondary functions are provided by the dual function switch actuator  26 : (a) a single short tap stores the present lighting level as a preset; and (b) a continuous resets the programmed brightness levels to factory set defaults or downloads the default levels from a central lighting controller. 
         [0071]    Refer now to  FIG. 8 . The wall box dimmer consists of enclosure  21  and attached bezel kit  22 . Bezel kit  22  consists of a bezel  23  that includes a vertical column of LEDs  25  and the inventive dual function switch actuator  26 . In this embodiment, one primary function button  241  is installed within bezel  23  and the vertical column of LEDs  25  is configured as a bar graph indicator which indicates the commanded lighting level. 
         [0072]    In the embodiment shown in  FIG. 9 , two primary function buttons  242 ; are installed within bezel  23  and the vertical column of LEDs  25  is configured as a bar graph indicator which indicates the commanded lighting level. As described previously, bezel kit  22  includes the bezel  23  and the inventive dual function switch actuator  26 . 
         [0073]    In the embodiment shown in  FIG. 10 , four primary function buttons  244 ; are installed within bezel  23  and the bezel kit  22  further includes the bezel  23 , the inventive dual function switch actuator  26 , and the vertical column of LEDs  25 . In this embodiment, the vertical column of LEDs includes seven LEDs, spaced to line up with the primary function buttons. More specifically, alternate LEDs  254  are aligned with corresponding primary function buttons and the remaining LEDs that are not aligned with corresponding buttons are powered off. 
         [0074]    Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims. 
       INDUSTRIAL APPLICABILITY 
       [0075]    To solve the aforementioned problems, the present invention is a unique dual function air-gap switch configuration that incorporates additional functionality while still maintaining the required air-gap switch functionality in the same physical space constraint. 
       LIST OF ACRONYMS USED IN THE DETAILED DESCRIPTION OF THE INVENTION 
       [0076]    The following is a list of the acronyms used in the specification in alphabetical order. 
         [0077]    AC alternating current 
         [0078]    FET field effect transistor 
         [0079]    LED light emitting diode 
         [0080]    SCR silicon controlled rectifier 
       Alternate Embodiments 
       [0081]    Alternate embodiments may be devised without departing from the spirit or the scope of the invention. For example, additional indicator lamps could be incorporated into the dual function air-gap switch actuator.