Patent Publication Number: US-2013240235-A1

Title: Load-control switch and load-control switch system

Description:
TECHNICAL FIELD 
     The present invention relates to a load control switch and a load control switch system, which can easily be replaced even if personnel does not have a qualification of registered electrician. 
     BACKGROUND ART 
     As for a load control switch, which is to be installed on a wall surface of a building and controls turning on and off of a load such as a ventilation fan or a lighting installation, one having an indication function, a delay function, a light control function, a radio signal reception function, a sensor function, or the like, other than one which simply controls on/off, is known. For example, it is not improbable that a simple on/off switch is desired to be replaced with a switch having a light control function following to replacement of the lighting installation, or a switch for a lighting installation in an entrance is desired to be replaced with one having a motion sensor (a human body detection sensor). In the conventional system, the load control switch must be replaced wholly and it needs wiring works, so that a user cannot replace the switch by oneself, and it must be relied on a person having a qualification of registered electrician. 
     On the other hand, as it is called DIY (Do It Yourself) recently, it is a fashion that a user purchases components in DIY stores (Home Center) and performs replacement of the components by oneself. In current system, as described in a catalogue of electric installations and materials of Panasonic Electric Works, 2010 2012, Page 19, for example, the user can select colors and designs of operation handles in DIY stores, at the best, botheration that the main body of the load control switch cannot be replaced freely remains. 
     DISCLOSURE OF INVENTION 
     The present invention is conceived to solve the above mentioned problems of the prior art and aimed to provide a load control switch and a load control switch system which enable a user to replace a load control switch to one having different function freely accompanying no wiring works. 
     A load control switch in accordance with an aspect of the present invention is characterized by comprising a terminal module which is installed on an installation frame established on a wall surface of a building and to which electric wires are connected, a switching function module which is detachably attached to the terminal module and has at least a switching function to control turning on and off of a load, and an operation handle which is detachably attached to the switching function module. 
     According to such a constitution, since the load control switch is separated into at least the terminal module to which the electric wires are connected and the switching function module which is detachably attached on the terminal module, it is sufficient to install only the terminal module on the wall surface of the building or the like, beforehand. Then, a user can make a selection only the switching function module or combination of the switching function module and the operation handle freely and install or replace it or them by oneself without performing the wiring works. 
     A load control switch system in accordance with an aspect of the present invention characterized by that the system is constituted by a terminal module which is mounted on a installation frame established on a wall surface of a building and to which electric wires are connected, plural switching function modules each of which is detachably attached on the terminal module and has at least a switching function to control turning on and off of a load, and plural operation handles each of which is detachably attached to the switching function module, and wherein a load control switch is constituted by mounting a switching function module selected among the plural switching function modules and an operation handle selected among the plural operation handles on the terminal module. 
     According to such a constitution, when the terminal module is installed beforehand, a user can replace the load control switch by oneself by purchasing a switching function module and an operation handle which meet the purpose in DIY store, or the like. Thereby, the wiring works for replacing the load control switch becomes needless. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a load control switch included in a load control switch system in accordance with a first embodiment of the present invention. 
         FIG. 2  is a perspective view of a load control switch in a first modified example of the above embodiment. 
         FIG. 3  is a perspective view of a load control switch in a second modified example of the above embodiment. 
         FIG. 4  is a perspective view of a load control switch in a third modified example of the above embodiment. 
         FIG. 5  is a perspective view of a load control switch in a fourth modified example of the above embodiment. 
         FIG. 6  is a perspective view of a load control switch in a fifth modified example of the above embodiment. 
         FIG. 7  is a perspective view of a load control switch in a sixth modified example of the above embodiment. 
         FIG. 8  is a perspective view of a load control switch in a seventh modified example of the above embodiment. 
         FIG. 9  is a perspective view showing a constitution of a load control switch system in accordance with an eighth modified example of the above embodiment. 
         FIG. 10  is a sequence chart when a reply signal is sent from a load control switch to a wireless remote control device in the load control switch system. 
         FIG. 11  is a sequence chart when no reply signal is sent from a load control switch to a wireless remote control device in the load control switch system. 
         FIG. 12  is an explanation view when a control signal is relayed out with using another wireless remote control device in the load control switch system. 
         FIG. 13  is a sequence chart when switching condition signals are transmitted at a regular interval from a switching control module to a wireless remote control device in the load control switch system regularly. 
         FIG. 14  is a perspective view showing a constitution of a load control switch system in accordance with a ninth modified example of the above embodiment. 
         FIG. 15  is a perspective view showing a constitution of a load control switch system in accordance with a tenth modified example of the above embodiment. 
         FIG. 16  is a perspective view showing a constitution of a load control switch system in accordance with an eleventh modified example of the above embodiment. 
         FIG. 17  is an explanation view when a reply signal is transmitted to another wireless remote control device in the load control switch system. 
         FIG. 18  is an explanation view when a reply signal is transmitted from an operation handle to a wireless remote control device in the load control switch system. 
         FIG. 19  is a perspective view showing a constitution of a load control switch system in accordance with a twelfth modified example of the above embodiment. 
         FIG. 20  is a perspective view showing a constitution of a load control switch system in accordance with a thirteenth modified example of the above embodiment. 
         FIG. 21  is a perspective view showing constitution of a load control switch system in accordance with a fourteenth modified example of the above embodiment. 
         FIG. 22  is an explanation view when a battery of a wireless remote control device is run out in the load control switch system. 
         FIG. 22  is an explanation view when a battery of an operation handle is run out in the load control switch system. 
         FIG. 24  is a perspective view showing a constitution of a load control switch system in accordance with a second embodiment of this invention. 
         FIG. 25  is a perspective view showing a constitution of a load control switch system in accordance with a first modified example of the above embodiment. 
         FIG. 26  is a perspective view showing a constitution of a load control switch in a second modified example of the above embodiment. 
         FIG. 27  is a perspective view showing a constitution of a load control switch system in accordance with a third modified example of the above embodiment. 
         FIG. 28  ( a ) is a perspective view showing a constitution example of a delay function selecting switch which is provided on a load control switch in the above load control switch system, and  FIG. 28  ( b ) is a perspective view showing a state that a second projection of a displacement member contacts a contact surface of the delay function selecting switch. 
         FIG. 29  is a perspective view showing another constitution example of the above delay function selecting switch. 
         FIG. 30  is a perspective view showing a constitution of a load control switch in a fourth modified example of the above embodiment. 
         FIG. 31  is a perspective view showing an application of a load control switch in the above third modified example. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     First Embodiment 
     A load control switch system in accordance with a first embodiment of the present invention is described.  FIG. 1  is a drawing showing a basic constitution of a load control switch  1  included in the load control switch system of this embodiment. The load control switch  1  is constituted by a terminal module  2  to which electric wires  5  are connected, a switching function module  3  which has a switching function to control turning on and off of a load through the electric wires  5 , and an operation handle  4 . The terminal module  2  is installed on an installation frame which is established on a wall surface of a building. The switching function module  3  is detachably attached to the terminal module  2 . The operation handle  4  is detachably attached to the switching function module  3 . The electric wires  5  consist of VVF (Vinyl insulated Vinyl sheathed Flat-type cable: 600V vinyl insulation vinyl sheath cable flat-type) or the like. 
     The terminal module  2  comprises inlets  21  into which core wires  51  of the electric wires  5  that insulation coatings are peeled off are inserted and outlets  22  into which sockets  31  of the switching function module  3  are inserted. The inlets  21  each are similar to those of the conventional load control switch which are automatically locked when the core wires  51  of the electric wires  5  are inserted. The constitution of the outlets  22  each is not limited in particular, and it may be electric contact simply or be a structure like a wall socket. In the latter case, a sliding shutter may be established in the outlet  22  to prevent an electric shock. In addition, as for the terminal module  2 , a structure for two wire system is exemplified in  FIG. 1 , it may be for three wire system. Since the terminal module  2  is installed by a person having specialist knowledge such as a registered electrician, according to the constitution of this embodiment, when the terminal module  2  is installed once, it is not replaced, usually. In addition, the terminal module  2  is smaller than that of the conventional load control switch, due to the switching function module  3  is decomposed therefrom. Therefore, an adapter  6  is used when it is installed on a conventional installation frame. 
     As for the switching function module  3 , an electronic switch, which uses a semiconductor switch element as a main switch element, is exemplified, for example. A push-on/push-off switch  33 , which is operated by the operation handle  4 , is provided on a mounting surface  32  of switching function module  3  to which the operation handle  4  is attached to. In addition, a bracing shaft  34 , which is fit to a bearing  42  provided on a rear face  41  of the operation handle  4 , is provided on the mounting surface  32  of the switching function module  3 . A projection  43 , which contacts the push-on/push-off switch  33  in a state that the bearing  42  is fit to the bracing shaft  34 , that is, the operation handle  4  is attached to the switching function module  3 , is provided on the rear face  41  of the operation handle  4 . The operation handle  4  is formed asymmetry with respect to the bracing shaft  34  (or the bearing  42 ), and it is held in one-sided by a spring of the push-on/push-off switch  33 , generally. 
     As generally known from the above catalogues or the like, size of the operation handle  4  is decided by a number of the load control switches installed on a single installation frame. For example, when only one load control switch is mounted on an installation frame, an operation handle called “single” having substantially the same size as that of a rectangular opening formed on a decorative plate is used. Alternatively, when two load control switches are mounted on an installation frame, operation handles called “double” each having a ½ size of a dimension in height direction of the rectangular opening formed on the decorative plate are used (dimensions in widthwise direction are the same). Furthermore, when three load control switches are mounted on an installation frame, operation handles called “triple” each having a ⅓ size of a dimension in height direction of the rectangular opening formed on the decorative plate are used. As well as the conventional case, it is needless to say that they can be selected among plural colors and designs. 
     A circuit board  35  is provided in an inside of the switching function module  3 , and a control circuit  36  which constituted by a semiconductor switch element such as a triac is mounted on the circuit board  35 . When the operation handle  4  is operated by a user; the push-on/push-off switch  33  is switched on or off, and thereby, the electric load is turned on or off. When the switching function module  3  is an electronic switch, various functions can be realized by combining various kinds of sensors such as a motion sensor and an illumination sensor and electronic circuits such as a delay circuit, a timer circuit, a radio communication circuit and so on. 
     In this embodiment, even when the terminal module  2  is installed beforehand, a user can replace the load control switch by oneself by purchasing a switching function module meeting the purpose and an applicable operation handle in the DIY store or the like. For example, it is assumed that the most popular priced mechanical switch was attached as the switching function module  3  when entering into a new residence, if the user wishes to use a light control function of a lighting installation, he/she may purchase a switching function module with light control function and an applicable operation handle and replace them by oneself. Thereby, it will be no need to ask an electric engineering firm, for example, for the wiring works, and thus, it is possible to improve or to change the function of the load control switch with low cost at any optional time. Besides, the load control switch system in accordance with the present invention is constituted by a terminal module  2  in a two wire system or in a three wire system for example, plural kinds of switching function modules  3  exemplified in the above embodiment and plural kinds of operation handles  4  applicable, and so on. 
     Modified examples of the load control switch system in accordance with this embodiment are described below. Equivalent constitutions and effects among the above embodiment and modified examples or among the modified examples are omitted. 
     First Modified Example of the First Embodiment 
     In a load control switch  1  of the first modified example shown in  FIG. 2 , a circuit board  44  is provided in an inside of the operation handle  4 , and an external electronic circuit  45  and a sliding volume  46  which is operated by a user are mounted on the circuit board  44 . Furthermore, plural (for example, it is exemplified in two) first contacts  37  are provided on a mounting surface of a switching function module  3  applicable to the operation handle  4 , and plural (generally, same number) second contacts  47  are provided on a rear face  41  of the operation handle  4 . Thereby, a control circuit  36  of an electronic switch and the external electronic circuit  45  are connected through the first contacts  37  and the second contacts  47 . 
     For example, when a lighting installation such as an incandescent lamp or LEDs is connected as a load, it is effective to provide a light control function to the load control switch. In such a case, the volume  46  is used as a light control volume serving a part of a light control circuit, and a main part of the light control function may be provided in the control circuit  36  side of the electronic switch. In addition, when a ventilation fan for a bathroom is connected as a load, it is effective to provide a timer function into the load control switch. In such a case, the volume  46  is used as a time setting volume of a timer circuit, and a main part of a timer function may be provided in either the control circuit  36  side of the electronic switch or the external electronic circuit  45  side of the operation handle  4 . Furthermore, when a ventilation fan for a restroom is connected as a load, it is effective to provide a delay function into the load control switch. When using the delay function regularly, a delay circuit may be provided in the control circuit  36  side of the electronic switch, and the load mat be turned off after passing a predetermined time period when a push-on/push-off switch  33  is switched off due to the operation of the operation handle  4 . An indication apparatus  48  such as an LED for showing that delay motion is running may be provided on the circuit board  44  of the operation handle  4 . Furthermore, a function selection switch  49  may be provided on the circuit board  44 , because there can be the case that the timer function or the delay function is not used. 
     Second Modified Example of the First Embodiment 
     In a load control switch  1  of a second modified example shown in  FIG. 3 , a motion sensor  61  and an illumination sensor  62  are further established in an inside of an operation handle  4 . A function selection switch  49  serves as a switch for selecting whether an automatic control of turning on and off of a load by the motion sensor  61  is used or not, and a volume  46  is used as a time setting volume for keeping the turning on state of the load. When the motion sensor  61  detects existence of a human body in a predetermined area and it is detected equal to or less than a predetermined brightness by the illumination sensor, a lighting installation as the load is turned on in a predetermined time period. 
     Third Modified Example of the First Embodiment 
     In a load control switch  1  of a third modified example shown in  FIG. 4 , a plug outlet  38  is provided on the switching function module  3 , and it is constituted that the plug outlet  38  becomes available when the operation handle  4  is detached or rotated more than 90 degrees in a predetermined direction. Although it is limited to a case that the terminal module  2  is in the three wire system, an electric power supply can be secured from the load control switch  1  in case of emergency. 
     Fourth Modified Example of the First Embodiment 
     A load control switch  1  of a fourth modified example shown in  FIG. 5 , is constituted that antennas  63  and  64  are further mounted on the circuit board  44  and the external electronic circuit  45  is consisted by a radio signal reception circuit  45   a , in the above first modified example. Driving electric power of the radio signal reception circuit  45   a  is supplied from the electronic switch (the switching function module  3 ) through the first contacts  37  and the second contacts  47 . In  FIG. 5 , a mode that three first contacts  37  are provided is exemplified and a number of the second contacts  47  is the same as that of the first contacts  37 . 
     It is constituted that the antennas  63  and  64  are arranged so that substantially the same elements are arranged to be approximately perpendicular to each other and only one of them is selected to be used. As is generally known, since electric waves transmitted from a wireless remote control device (not illustrated) include transverse electric component and transverse magnetic component, one of the antennas  63  and  64  which has a splendid signal reception condition can be selected corresponding to surrounding radio wave environment. Selection of the antenna  63  or  64  may be changed by switching of a user, or it may be an automatic change by the radio signal reception circuit  45   a.    
     For example, when a lighting installation such as an incandescent lamp or LEDs is connected as a load, it is effective to provide a light control function into the load control switch. In such a case, it may be constituted that a light control circuit is further provided in a control circuit  36  of the electronic switch, and a light control signal is received by a radio signal reception circuit  45   a , and the light control circuit performs light control of the lighting installation as the load corresponding to the light control signal. 
     In this modified example, it is assumed that the most popular priced mechanical switch was attached as the switching function module  3  when entering into a new residence. In such a case, when a user wishes to control turning on and off of the lighting installation from a wireless remote control device, he/she may purchase a switching function module  3  with an electronic switch, an operation handle  4  with a radio signal receiving function and a wireless remote control device, and replace them by oneself. Thereby, it will be no need to ask an electric engineering firm, for example, for the wiring works, and thus, it is possible to improve or to change the function of the load control switch with low cost at any optional time. 
     Fifth Modified Example of the First Embodiment 
     A load control switch  1  of a fifth modified example shown in  FIG. 6  is constituted that a driving electric power is supplied from a primary battery  65  built in the operation handle  4  to the radio signal reception circuit  45   a , in the above fourth modified example. In addition, the first contacts  37  and the second contacts  47  are respectively provided at least two each. For example, in the case of a two wire system, a load control switch  1  is connected in series for a commercial electric power supply and a load. Then, a driving electric power of a control circuit  36  of a switching function module  3  of the load control switch  1  is supplied from the commercial electric power supply. In other words, even in a state that the load is turned off, a standby power requirement is consumed for standing ready a CPU of the control circuit  36  or the like, and a minute electric current flows in the load due to it. Similarly, a radio signal reception circuit  45   a  waits to be able to receive a control signal from a wireless remote control device, even when the load is turned off state. Hereupon, if the driving electric power of the radio signal reception circuit  45   a  is supplied from the witching function module  3  similar to the fourth modified example shown in  FIG. 5 , an electric current flowing into the load increases in the state that the load is switched off. It does not the matter if the load is the incandescence light, but when the load such as the LEDs of low electric power consumption and having characteristics that value of electric current reduces corresponding to the increase of voltage of the commercial electric power supply, there is a possibility that the LEDs may be lit by the electric current due to the standby power requirement of the control circuit  36 . Therefore, it is possible to prevent false lighting of the LEDs by supplying the driving electric power of the radio signal reception circuit  45   a  from a built-in primary battery  65 , like the fifth modified example shown in  FIG. 6 . Besides, if using a lithium ion battery as for the primary battery  65 , battery life of 3-5 years is secured (it depends on use frequency), so that there is no problem in practical use. In addition, it may be constituted that a warning is outputted to urge the battery exchange when there is little battery life. 
     Sixth Modified Example of the First Embodiment 
     A load control switch  1  of a sixth modified example shown in  FIG. 7  comprises an electric generation element  66  such as a solar cell and a secondary battery  67  into which electric power generated by the electric generation elements  66  is charged in an operation handle  4 , in the above fourth modified example. It is constituted that driving electric power is supplied from the electric generation element  66  or the secondary battery  67  to a radio signal reception circuit  45   a . As for the electric generation element  66 , a piezoelectric elements can be used other than the solar cell. For example, the operation handle  4  is pressed in a constant direction by a spring of a push-on/push-off switch  33 . Therefore, it is possible to generate an electric power of about the driving electric power of the radio signal reception circuit  45   a  if a piezoelectric element is provided on a rear face  41  of the operation handle  4  and a pressure is added to the piezoelectric element regularly. In addition, since the operation handle  4  comprises the electric generation element  66 , the operation handle  44  needs no terminals for receiving electric power, and needs no electric power supply from the switching function module  3 , so that circuit constitution can be simplified. Furthermore, a user becomes freedom from maintenance such as battery exchange of the operation handle by using the electric generation element  66 . 
     Seventh Modified Example of the First Embodiment 
     A load control switch  1  of a seventh modified example shown in  FIG. 8  is constituted that an operation handle  4  is approximately square in a front view, and attachable in two directions perpendicular to each other with respect to a mounting surface  32  of a switching function module  3 , in the above fourth modified example. Since only one antenna  63  is mounted on a circuit board  44 , it is possible to set the signal receiving direction of the antenna  63  in the most suitable direction by changing the attaching direction of the operation handle  4  for the switching function module  3 . Two sets of bearing  42 A and  42 B and second contacts  47 A and  27 B respectively arranged that directions of them are to be perpendicular to each other are provided on a rear face of the operation handle  4 . In such a case, first contacts  37 A of the switching function module  3  are formed as spring pieces. By shaping the operation handle  4  as a square, although a number of the load control switches which can be mounted on an installation frame is limited to one or two, it enables to reduce a number of antennas to be one and to simplify a constitution of a radio signal reception circuit  45   a  and to reduce the cost. 
     Eighth Modified Example of the First Embodiment 
     A load control switch system “A” in accordance with an eighth modified example shown in  FIG. 9  comprises a wireless remote control device  7  as well as a load control switch  1 . As for the load control switch  1  of the eighth modified example, the radio signal reception circuit  45   a  (see  FIG. 5 ) in the load control switch of the above fourth modified example is replaced with a radio signal transmission and reception circuit  45   b , and a control circuit  68  is further mounted on a circuit board  44 . A control circuit  36  of an electronic switch and the radio signal transmission and reception circuit  45   b  and the control circuit  68  are connected through first contacts  37  and second contacts  47 . Driving electric power of the radio signal transmission and reception circuit  45   b  is supplied from the electronic switch (the switching function module  3  side) through the first contacts  37  and the second contacts  47 . According to such a constitution, since the operation handle  4  is driven by the electric power supplied from the electronic switch module, it needs no maintenance such as battery exchange of the operation handle  4 . 
     The wireless remote control device  7  is used to perform the remote control of switching or light intensity of the load control switch  1  by performing radio communication between the radio signal transmission and reception circuit  45   b  of the operation handle  4  and it. The wireless remote control device  7  may be a light-weighted form enabling to be carried on or may be a fixed form on a wall so as not to be carried on. 
     The wireless remote control device  7  comprises an operation button unit  71 , a control unit (a control signal output unit)  72 , a signal transmission and reception unit  73  and an indication unit (a load control state informing unit)  74 . The operation button unit  71  consists of plural button units which receive input operations of the load control switch  1  which a user demands, and includes an on/off button of the load control switch  1  and a brightness adjustment button, for example. The control unit  72  comprises a CPU, and generates a control signal which is to be transmitted to the load control switch  1  depending on the operation button unit  71 , and outputs it to the signal transmission and reception unit  73 . In addition, the control unit  72  performs indication control of the indication unit  74  corresponding to the signal transmitted to and signal received from the load control switch  1 . The signal transmission and reception unit  73  receives a command from the control unit  72  and performs transmitting and receiving a control signal between the load control switch  1  and it. The indication unit  74  is a liquid crystal display unit or an LED (light emitting diode) to inform communication state with the load control switch  1  to the user, or a buzzer for generating warning sound, or the like. For example, when no reply signal returns from the load control switch  1  after transmitting the control signal from the wireless remote control device  7  to the load control switch  1 , a warning indication such as “communication with lighting installation is impossible” is displayed on the indication unit  74  of the wireless remote control device  7 . 
     Subsequently, it will be described relating to a motion of the load control switch system “A” in accordance with this embodiment. As shown in  FIG. 10 , when an instruction input such as lighting or extinction of the lighting installation is performed through the operation button unit  71  of the wireless remote control device  7 , first (S 21 ), the control unit  72  generates a control signal corresponding to a kind of the operation button unit  71  and outputs it to the signal transmission and reception unit  73  (S 22 ). Then, the signal transmission and reception unit  73  transmits the control signal to the radio signal transmission and reception circuit  45   b  of the operation handle  4  (S 23 ). 
     Subsequently, the control circuit  68  of the operation handle  4  acquires the control signal through the radio signal transmission and reception circuit  45   b  which received the control signal (S 24 ). In addition, the control circuit  6  (SIC:  68 ) performs a command signal corresponding to the control signal acquired to the control circuit  36  of the switching function module  3  (S 25 ), and performs a reply command of a reply signal which shows confirmation of reception of the control signal (S 26 ). Then, the radio signal transmission and reception circuit  45   b  transmits the reply signal to the wireless remote control device  7  (S 27 ), and the signal transmission and reception unit  73  of the wireless remote control device  7  receives the reply signal (S 28 ). Subsequently, the control unit  72  which received the reply signal indicates a fact that the command input performed with the operation button unit has been completed on the indication unit  74  (S 29 ). 
     As shown in  FIG. 11 , the control unit  72  of the wireless remote control device  7  retransmits the control signal (S 32 ), when no reply signal from the load control switch  1  had been received within a predetermined time period (S 31 ) after transmitting the control signal to the load control switch  1  (S 23 ). Thereby, communication reliability between the wireless remote control device  7  and the load control switch  1  can be increased much more. 
     In addition, the control unit  72  of the wireless remote control device  7  indicates “communication with lighting installation is impossible” on the indication unit  74  (S 35 ), when no reply signal had been received (S 33 , S 34 ) after retransmitting the control signal (S 32 ). As for this, there is a case that no reply signal had been received from all the load control switches  1 , even when a user performs input operation to extinction of all the plural lighting installations with using the operation button unit  71  of the wireless remote control device  7 . In such a case, the user can know surely that all the lighting installations are not extinguished by indicating the fact that the lighting installations corresponding to a part of the load control switches  1  are not extinguished on the indication unit  74 . 
     In addition, as shown in  FIG. 12 , the wireless remote control device  7  may retransmit the control signal to a desired load control switch  1  in the retransmission of the control signal described in the above S 32  with using another load control switch  1  or another wireless remote control device  7  existing in the load control switch system “A” as a transponder. As for this, when the first transmission of the control signal was impossible, it is highly possible that retransmission of the control signal will be impossible with using the same wireless remote control device  7 . Communication reliability between the wireless remote control devices  7  and the load control switch  1  is increased by commissioning the relay of the second transmission of the control signal to another load control switch  1  or another wireless remote control device  7  in the load control switch system “A”. In addition, in this case, a command showing commission of relay and information of forwarding address of the load control switch  1  and so on are included in a header portion of the control signal. In addition, besides  FIG. 12 , there is a method that the wireless remote control device  7  broadcasts the relay of the control signal to other load control switches  1  and other wireless remote control devices  7  in the load control switch system “A” extends. 
     In addition, for enabling the user to confirm the turning on/off state of the lighting installation at the present moment surely, the control circuit  36  of the switching function module  3  generates a load control state signal at a regular interval (for example, several seconds) and transmits it to the control circuit  68  of the operation handle  4  (S 51 ), as shown in  FIG. 13 . Then, the control circuit  68  of the operation handle  4  transmits the load control state signal to the wireless remote control device  7  through the radio signal transmission and reception circuit  45   b  (S 52 ,  53 ). The control unit  72  of the wireless remote control device  7  indicates the turning on/off state of the lighting installation in the indication unit  74  based on the load control state signal which is received (S 54 ,  55 ). Thereby, the user can confirm the turning on/off state of the lighting installation at the present moment in the indication unit  74  of the wireless remote control device  7 , even when plural wireless remote control devices  7  exist or plural load control switches  1  are connected to one lighting installation using three-way switches or four-way switches. 
     In this modified example, in order to replace the load control switch  1 , it will be no need to ask an electric engineering firm, for example, for the wiring works, and thus, it is possible to improve or to change the function of the load control switch with low cost at any optional time, similar to the above fourth modified example. 
     In addition, when a load control switch  1  is operated from the wireless remote control device  7 , the communication state is indicated in the indication unit  74  by receiving a reply signal replied from the load control switch  1 . Therefore, communication reliability between the wireless remote control device  7  and the load control switch  1  is improved and the user can confirm turning on/off of the lighting installation through the indication unit  74 . 
     Ninth Modified Example of the First Embodiment 
     A load control switch  1  of a ninth modified example shown in  FIG. 14  is constituted that driving electric power is supplied to a radio signal transmission and reception circuit  45   b  and a control circuit  68  from a primary battery  65  built in an operation handle  4 , in the above eighth modified example. In addition, first contacts  37  and second contacts  47  are to be at least two each. The radio signal transmission and reception circuit  45   b  or the control circuit  68  always waits to receive a control signal from a wireless remote control device  7 , even when a load is in a turned off state. A constitution to supply the electric power to the radio signal transmission and reception circuit  45   b  and the control circuit  68  in this modified example is similar to the constitution to supply the electric power to the radio signal transmission and reception circuit  45   a  and the control circuit  68  in the above fifth modified example. In addition, connection constitution of the load control switch  1  to the commercial power supply and the load and electric power feeding constitution to the control circuit  36  are equivalent to those in the above fifth modified example. Therefore, the load control switch  1  of this modified example has substantially the same as that of the above fifth modified example. 
     In addition, the wireless remote control device  7  comprises a built-in primary battery  75  and using the primary battery  75  as an electric power supply to drive each processing section such as the control unit  72 , so that the wireless remote control device  7  can be light-weighted and enables to improve convenience of the user. Besides, in the wireless remote control device  7  of a type fixed on a wall, it may have an electric power reception circuit to receive the electric power from the commercial electric power supply. 
     Tenth Modified Example of the First Embodiment 
     A load control switch  1  of a tenth modified example shown in  FIG. 15  comprises an electric generation element  66  such as a solar cell and a secondary battery  67  into which electric power generated by the electric generation elements  66  is charged in an operation handle  4 , in the above eighth modified example. It is constituted that driving electric power is supplied from the electric generation element  66  or the secondary battery  67  to the radio signal reception circuit  45   b  and the control circuit  68 . A constitution to supply the electric power to the radio signal transmission and reception circuit  45   b  and the control circuit  68  in this modified example is similar to the constitution to supply the electric power to the radio signal transmission and reception circuit  45   a  and the control circuit  68  in the above sixth modified example, so that substantially the same effect as that of the above fifth modified example can be obtained. 
     Eleventh Modified Example of the First Embodiment 
     As load control switch system “A” in accordance with an eleventh modified example shown in  FIG. 16  comprises plural (a case of two is exemplified) wireless remote control devices  7 , and each of the wireless remote control devices  7  has an information unit  76 , in the above eighth modified example. The information unit  76  is a moving unit to inform a location of the wireless remote control device  7  to a user, and it may be a buzzer, an LED (light emitting diode) or a vibrator. 
     The control unit  72  controls information motion in the information unit  76  corresponding to a signal transmitted to or a signal received from the load control switch  1 . The information unit  76  receives an instruction signal from the control unit  72  and starts a motion such as warning sound from the buzzer, lighting or flickering of the LED or vibrator function. In this way, the information unit  76  informs the location of the wireless remote control device  7  to the user via sense of vision or sense of hearing of the user. 
     Subsequently, it will be described relating to the motion of the load control switch system “A” in accordance with this embodiment. As shown in  FIG. 17 , when a user lost desired wireless remote control device  7 B, a “button for search” provided in the operation button unit  71  of another wireless remote control device  7 A is pushed down, for example. Then, the control unit  72  transmits a control signal for search of the wireless remote control device  7 B to the operation handle  4 . 
     Subsequently, the control circuit  68  of the operation handle  4  acquires the control signal through the radio signal transmission and reception circuit  45   b  and generates a reply signal for starting the motion of the information unit  76  of the wireless remote control device  7  each in the load control switch system “A”. Then, the radio signal transmission and reception circuit  45   b  transmits the reply signal to the plural wireless remote control devices  7  in an area in load control switch system “A” where electric waves can reach. Subsequently, the control unit  72  of the wireless remote control device  7 B which received this reply signal starts the information motion of the information unit  76 . Therefore, the user can find lost wireless remote control device  7 B easily by using one of the plural wireless remote control devices  7  in the load control switch system “A”. 
     Besides, a “switch for search  40 ” provided on the operation handle  4  of the load control switch  1  can be used without transmitting the control signal from the wireless remote control device  7 , as shown in  FIG. 18 . When the user pushes down this “switch for search  40 ”, a reply signal for letting to start the motions of the information units  76  to the plural wireless remote control devices  7  in the load control switch system “A” is transmitted from the load control switch  1  at once. Therefore, the user can find the lost wireless remote control device  7  easily. 
     In this modified example, in order to replace the load control switch  1 , it will be no need to ask an electric engineering firm, for example, for the wiring works, and thus, it is possible to improve or to change the function of the load control switch with low cost at any optional time, similar to the above eighth modified example. 
     In addition, it is assumed that a user who lost desired wireless remote control device  7  among the plural wireless remote control devices  7  in the load control switch system “A” operates the load control switch  1  with using another wireless remote control device  7 . In such a case, the wireless remote control device  7  which received the reply signal replied from the load control switch  1  starts the information motion of the information unit  76 . Thereby, the user can find the lost wireless remote control device  7  easily with using another wireless remote control device  7 . 
     Twelfth Modified Example of the First Embodiment 
     A load control switch  1  in a twelfth modified example shown in  FIG. 19  is constituted that driving electric power is supplied to a radio signal transmission and reception circuit  45   b  and a control circuit  68  from a primary battery  65  built in an operation handle  4 , in the above eleventh modified example. In addition, first contacts  37  and second contacts  47  are to be at least two each. The radio signal transmission and reception circuit  45   b  or the control circuit  68  always waits to receive a control signal from a wireless remote control device  7 , even when a load is in a turned off state. A constitution to supply the electric power to the radio signal transmission and reception circuit  45   b  and the control circuit  68  in this modified example is similar to the constitution to supply the electric power to the radio signal transmission and reception circuit  45   a  and the control circuit  68  in the above fifth modified example. In addition, connection constitution of the load control switch  1  to the commercial power supply and the load and electric power feeding constitution to the control circuit  36  are equivalent to those in the above fifth modified example. Therefore, the load control switch  1  of this modified example has substantially the same as that of the above fifth modified example. 
     In addition, the wireless remote control device  7  has a constitution to drive each processing section such as the control unit  72 , by the built-in primary battery  75 . The driving mode of each processing section is the same as that of the wireless remote control device  7  in the above ninth modified example, so that it has substantially the same effect as that in the ninth modified example. Besides, in the wireless remote control device  7  of a type fixed on a wall, it may have an electric power reception circuit to receive the electric power from the commercial electric power supply. 
     Thirteenth Modified Example of the First Embodiment 
     A load control switch  1  of a thirteenth modified example shown in  FIG. 20  comprises an electric generation element  66  such as a solar cell and a secondary battery  67  into which electric power generated by the electric generation elements  66  is charged in an operation handle  4 , in the above eighth modified example. It is constituted that driving electric power is supplied from the electric generation element  66  or the secondary battery  67  to a radio signal reception circuit  45   b  and a control circuit  68 . A constitution to supply the electric power to the radio signal transmission and reception circuit  45   b  and the control circuit  68  in this modified example is similar to the constitution to supply the electric power to the radio signal transmission and reception circuit  45   a  and the control circuit  68  in the above sixth modified example, so that substantially the same effect as that of the above fifth modified example can be obtained. 
     Fourteenth Modified Example of the First Embodiment 
       FIG. 21  shows a constitution of a load control switch system “A” in accordance with a fourteenth modified example. In the load control switch system “A” in accordance with this modified example, an operation handle  4  comprises an information unit  4   a  for informing battery running out in a wireless remote control device  7  or battery running out in the operation handle  4  to a user. In addition, the operation handle  4  comprises a battery running out detection circuit  4   b  which measures a value of voltage and detects the battery running out of the primary battery  65  built in the operation handle  4 . In addition, the wireless remote control device  7  comprises a battery running out detection unit  77  which measures a value of voltage and detects the battery running out of a primary battery  75 . 
     Subsequently, various kinds of motions of the load control switch system “A” of this modified example is described referring to  FIG. 22  and  FIG. 23  as well as  FIG. 21 . As shown in  FIG. 22 , when the battery running out is detected in the battery running out detection unit  77  of the wireless remote control device  7 , a control unit  72  transmits a motion signal for letting to start a motion of the information unit  4   a  of the operation handle  4  to a radio signal transmission and reception circuit  45   b . A control circuit  68  which received the motion signal indicates the battery running out of the wireless remote control device  7  in an information unit  4   a  to a user. Besides, the information unit  4   a  may be a mode to inform by warning sound other than display indication shown in  FIG. 21 . 
     On the other hand, as shown in  FIG. 23 , when the battery running out is detected in the battery running out detection circuit  4   b  of the operation handle  4 , the control circuit  68  transmits a motion signal for letting to start a motion of an information unit  76  to the wireless remote control device  7 . The control unit  72  which received the motion signal makes the information region  76  start a motion to inform the battery running out of the built-in primary battery  65  of the operation handle  4  to the user. By such a constitution, the user can know batter running out of the primary battery  75  in the wireless remote control device  7  or batter running out of the primary battery  65  in the operation handle  4  surely. 
     Second Embodiment 
     A load control switch system in accordance with a second embodiment of the present invention is described.  FIG. 24  is a drawing showing a constitution of load control switches included in the load control switch system in accordance with this embodiment. In this drawing, members of the same constitutions as those in the above first embodiment are referred the same marks. Basically, one load control switch  1  consists of one switch module and one operation handle. However, in the load control switch system “A” of this embodiment, plural switch modules and a single operation handle constitute plural load control switches corresponding to plural loads (such as illumination installations), simultaneously.  FIG. 24  shows a state that plural (for example, three) electronic switch modules  8  are directly mounted on an installation frame  9  established on a wall surface of a building in a manner to be arranged in a vertical direction, and a single operation handle  4  is attached to the plural electronic switch modules  8 . 
     A terminal base  81  to which electric wires  5  are connected is provided on a rear face  8   a  of the electronic switch module  8  each. The terminal base  81  further comprises inlets  21  into which core wires  51  of the electric wires  5  that insulation coatings are peeled off are inserted, and they are constituted to be automatically locked when the core wires  51  of the electric wires  5  are inserted (similar to those in the conventional load control switch). In addition, as for the terminal base  81 , one in a two wire system is exemplified in  FIG. 24 , it may be one in a three wire system. Since the electronic switch modules  8  are installed by a person having specialist knowledge such as a registered electrician, according to the constitution of this embodiment, when the terminal module  2  (SIC: electronic switch module  8 ) is installed once, it is not replaced, usually. 
     The electronic switch module  8  is an electronic switch using a semiconductor switch element as a main switch element, and a push-on/push-off switch  33  operated by the operation handle  4  is provided on a mounting surface  8   b  to which the operation handle  4  is attached. In addition, first contacts  37 , through which a control signal outputted from a radio signal reception circuit which will be mention later is inputted, are provided on the mounting surface  8   b  of the electronic switch module  8 . The first contacts  37  constitute external signal input terminals. A circuit board  35  is provided in an inside of the electronic switch module  8 , and a control circuit  36  which is constituted by a semiconductor switch element such as a triac and controls conduction and non-conduction of the main switch is mounted on the circuit board  35 . When the operation handle  4  is operated by a user, and thereby, the push-on/push-off switch  33  is switched on or off, alternatively a control signal is inputted from the first contacts  37 , the load is turned on or off thereby. 
     Only one operation handle  4  is used for plural (for example, three) electronic switch modules  8 . The operation handle  4  has a bracing shaft  11  formed perpendicularly along an arrangement of the electronic switch modules  8  in a state that it is attached to the plural electronic switch modules  8 . In addition, the operation handle  4  has plural (for example, three) movable sections  12 A to  12 C which are formed in a shape of a cantilever to project from the bracing shaft  11  in a direction perpendicular to a center axis of the bracing shaft  11  each. The bracing shaft  11  is fit to fitting projections  91  which are formed on the installation frame  9 , for example, so that it is fixed thereon. The operation handle  4  is formed by resin molding, for example, coupling portions of the bracing shaft  11  and the movable sections  12 A to  12 C are formed to have a wall thickness thinner than that of the other portions, for example. Thereby, each movable section  12 A to  12 C can be deformed (bent) independently from other movable sections, so that the push-on/push-off switch  33  of each electronic switch module  8  can be operated individually. In addition, the constitution, which enables each movable section  12 A to  12 C to be deformed (bent) independently, is not limited to this, so that it may be another constitution such as hinges. Besides, the operation handle  4  is fixed so that the bracing shaft  11  is fit to the fitting projections  91  of the installation frame  9  and attached to the electronic switch modules  8  which are mounted on the installation frame  9 , indirectly. However, it may be constituted that either of or all of the movable sections  12 A to  12 C of the operation handle  4  is/are directly attached to the mounting surface/surfaces  8   b  of electronic switch module/modules  8 , directly. 
     As is generally known, size of the operation handle is decided by a number of the electronic switch module  8  mounted on an installation frame. For example, when only one electronic switch module  8  is mounted on an installation frame  9 , an operation handle  4  called “single” having substantially the same size as that of a rectangular opening formed on a decorative plate is used. Alternatively, when two electronic switch modules  8  are mounted on the same installation frame  9 , operation handles  4  called “double” each having a ½ size of a dimension in height direction of the rectangular opening formed on the decorative plate are used (dimensions in widthwise direction are the same). Furthermore, when three electronic switch modules  8  are mounted on the same installation frame  9 , operation handles  4  called “triple” each having a ⅓ size of a dimension in height direction of the rectangular opening formed on the decorative plate are used. In this embodiment, the size of the movable section  12 A to  12 C of the operation handle  4  is formed to be approximately ½ or approximately ⅓ of a dimension in a height of the rectangular opening formed on the decorative plate. As well as the conventional case, it is needless to say that it can be selected among plural colors and designs. 
     A radio signal reception circuit  45   a  and an antenna  64  are mounted in an inside of a movable section (for example,  12 B). In addition, a projection  43  to push the push-on/push-off switch  33  is formed on the rear face of each movable section  12 A to  12 C, that is, a rear face  41  facing a mounting surface  8   b  of the electronic switch module  8 . In addition, second contacts  47 , which are to be connected to the first contacts  37  of the electronic switch module  8 , are provided on the rear face  41 . The second contacts  47  constitute output terminals. In addition, the radio signal reception circuit  45   a  is connected to respective second terminals  47  through signal lines  47   a , and thereby, the radio signal reception circuit  45   a  and the control circuit  36  of the electronic switch module  8  is connected. 
     As is generally known, since electric waves transmitted from a wireless remote control device (not illustrated) include transverse electric component and transverse magnetic component, there may be a case that one component is splendid than the other component in signal reception sensitivity due to surrounding radio wave environment. Although only one antenna  64  is illustrated in  FIG. 24 , it may be constituted that two antennas are arranges so that signal receiving directions of them are to be perpendicular to each other, and one antenna having a splendid signal reception condition is selected. Selection of the antenna may be changed by switching of a user, and it may be an automatic changed by the radio signal reception circuit  45   a.    
     In addition, in the embodiment shown in  FIG. 24 , driving electric power of the radio signal reception circuit  45   a  is not limited in particular, so that it is possible to provide a primary battery in an inside of the operation handle  4  and to supply the driving electric power from the primary battery. In addition, it is possible to provide a solar cell on a decoration face of the operation handle  4  and to supply the driving electric power from the solar cell. Alternatively, it is possible to provide contacts other than the first contacts  37  and the second contacts  47  and to supply the driving electric power from the electronic switch module  8  to the operation handle  4  side. 
     Furthermore, when a lighting installation such as an incandescent lamp or LEDs is connected as load, it is effective to provide a light control function to the load control switch. In such a case, it may be constituted that a light control circuit is further provided in the control circuit  36  of the electronic switch, a light control signal transmitted from a wireless remote control device is received by the radio signal reception circuit  45   a  and the light control circuit performs light control of a lighting installation as a load corresponding to the light control signal. The wireless remote control device (not illustrated) should possess operation buttons to control lighting (on) and extinction (off) of at least a specific lighting installation or all lighting installations, and constitution and arrangement of them are not limited in particular. Furthermore, it may possess the above light control button for light controlling. 
     In this embodiment, a user can replace the load control switch by oneself by purchasing a switching function module  3  (SIC) meeting the purpose and an applicable operation handle  4  in the DIY store or the like. For example, it is assumed that an operation handle having no electronic function is attached when entering into a new residence, if the user wishes to use a light control function of a lighting installation, he/she may purchase an operation handle  4  and a wireless remote control device, and replace the operation handle  4  by oneself. Thereby, wiring works for replacing works is not needed, so that it will be no need to ask an electric engineering firm, for example, for the wiring works, and thus, it is possible to improve or to change the function of the load control switch with low cost at any optional time. 
     In addition, when a control signal transmitted from the wireless remote control device is received by a single radio signal reception circuit  45   a , the control signal may be inputted into either of or all of the plural electron switch modules  8  corresponding to the contents of the received control signal. Therefore, it is possible to control turning on and off of plural loads (lighting installations) individually or simultaneously by a single wireless remote control device and a single radio signal reception circuit  45   a.    
     Although a mode that a plurality of the same kind of the electronic switch modules  8  are mounted on a single installation frame  9  and a kind of the operation handle is attached thereon is exemplified in  FIG. 24 , the load control switch system “A” comprises plural kinds of switch modules having different functions each other. In addition, the load control switch system “A” comprises plural kinds of operation handles which are to be detachably attached to plural kinds of the switch modules. Then, a load control switch is constituted by attaching one operation handle selected among the plural kinds of operation handles to one switch module selected among the plural kinds of switch modules. 
     Modified examples of the load control switch system “A” of this embodiment will be described below. Equivalent constitutions and effects among the above embodiment and modified examples or among the modified examples are omitted. 
     First Modified Example of the Second Embodiment 
       FIG. 25  is a drawing showing a constitution of a load control switch  1  in a first modified example. In this modified example, an operation handle  4  is a form of a board body which covers the whole arrangement of plural electronic switch modules  8  in a state that it is attached to the plural electronic switch modules  8 . Then, slits  14  are formed to be able to deform movable sections  13 A to  13 C facing push-on/push-off switches  33  of the plural electronic switch modules  8  independently each. A radio signal reception circuit  45   a , second contacts  47  and signal lines  47   a  are provided to avoid the movable sections  13 A to  13 C, and thereby, the signal lines  47  are not flexed so that defectiveness due to breakage of the signal lines  47   a  is prevented. 
     Second Modified Example of the Second Embodiment 
       FIG. 26  is a drawing showing a constitution of an electronic switch module  8  in the second modified example. In this modified example, the electronic switch module  8  is constituted by a terminal module  2  to which electric wires  5  are connected, and a switching function module  3  which is detachably attached to the terminal module  2  and has at least a switching function to control turning on and off of a load. In this way, since the electronic switch module  8  is divided into the terminal module  2  and the switching function module  3 , a user can replace a function of a switch module without accompanying electrical works. Constitutions of the terminal module  2  and the switching function module  3  in this modified example are respectively equivalent to the terminal module  2  and the switching function module  3  except the bracing shaft  34  in the above second modified example of the first embodiment (see  FIG. 2 ). 
     In this embodiment, even when the terminal module  2  is installed beforehand, a user can replace the load control switch by one self by purchasing a switching function module  3  meeting the purpose and an applicable operation handle  4  in the DIY store or the like. For example, it is assumed that the most popular priced mechanical switch was attached as the switching function module when entering into a new residence. In such a case, if the user wishes to control on and off of a lighting installation from a wireless remote control device, he/she may purchase a switching function module  3  with electronic switch, an operation handle  4  having radio signal receiving function and a wireless remote control device, and replace the switching function module  3  and the operation handle  4  by oneself. Thereby, it is possible to improve or to change the function of the load control switch with low cost at any optional time. 
     Besides, the load control switch system in accordance with this modified example is constituted by a terminal module  2  in a two wire system or in a three wire system, for example, plural kinds of switching function modules  3  exemplified in the above embodiment and plural kinds of operation handles  4  applicable, and so on. 
     Third Modified Example of the Second Embodiment 
       FIG. 27  is a drawing showing a constitution of a load control switch  1  in a third modified example. In this modified example, plural (for example, three) electronic switch modules  8 ,  8 A,  8 B of different kinds are mounted on an installation frame  6  (SIC:  9 ) in a manner to be arranged in a vertical direction. Furthermore, different operation handles  4 ,  4 A,  4 B are attached to the electronic switch modules  8 ,  8 A,  8 B, respectively. Hereupon, central electronic switch module  8  has a delay function, and central operation handle  4  is an operation handle corresponding to the electronic switch module  8  having the delay function. Hereupon, the central electronic switch module  8  and the operation handle thereof are explained mainly. 
     The electronic switch module  8  is an electronic switch using a semiconductor switch element as a main switch element, and a bracing shaft  34 , which is fit to a bearing  42  provided on a rear face  41  of the operation handle  4 , is provided on a mounting surface  8   b  to which the operation handle  4  is attached. A projection  43 , which contacts the push-on/push-off switch  33  in a state that the operation handle  4  is attached to the electronic switch module  8 , is provided on the rear face  41  of the operation handle  4 . The operation handle  4  is formed asymmetry with respect to the bracing shaft  34  (or the bearing  42 ), and it is held in one-sided by a spring of the push-on/push-off switch  33 , generally. 
     A circuit board  35  is provided in an inside of the electronic switch module  8 , an electric power supply circuit (not illustrated), a load control circuit  36   a  and a delay circuit  36   b  are mounted on the circuit board  35 , other than a main switch element. The load control circuit  36   a  and the delay circuit  3   b  are constituted by a CPU and so on, for example. The load control circuit  36   a  functions as a subordinate (SIC) control circuit for controlling conduction and non-conduction of semiconductor switch element such as a triac. In addition, the delay circuit  36  turns off the load after passing a predetermined time period after the push-on/push-off switch  33  is pushed off. A delay function selection switch  82  for letting the delay function of the delay circuit  36   b  effective and for setting a delay time is provided on a mounting surface  8   b  of the electronic switch module  8 . In other words, as long as the delay function selection switch  82  is not switched on, the delay function of the delay circuit  36   b  is unavailable. 
     An L-shaped groove  4   c  is formed on a rear face  41  of the operation handle  4 , for example, and a displacement member  4   d  is fit into the groove  4   c . When a longer side of the L-shaped groove  4   c  (horizontal direction) is defined as a first direction and a shorter side (vertical direction) is defined as a second direction, the displacement member  4   d  slides in the groove  4   c  along the first direction and the second direction. In addition, the displacement member  4   d  has a projection  4   e  (a second projection) which is projected outward from the rear face  41 . On the other hand, the delay function selection switch  82  has a contact face of a rectangle that a length in the first direction (horizontal direction) is longer than a length in the second direction (vertical direction). In a state that the operation handle  4  is attached to the electronic switch module  8 , the longer side of the L-shaped groove  4   c  approximately overlaps the contact face of the delay function selection switch  82 . When the displacement member  4   d  is located somewhere in the longer side of the L-shaped groove  4   c , the projection  4   e  of the displacement member  4   d  contacts the delay function selection switch  82 . The position at somewhere on the longer side of the L-shaped groove  4   c  is defined as a first position  4   f  of the displacement member  4   d . When the displacement member  4   d  is slid upward in the shorter side of the L-shaped groove  4   c , the projection  4   e  of the displacement member  4   d  does not contact the delay function selection switch  82 . The upward position on the shorter side is defined as a second position  4   g  of the displacement member  4   d . In addition, although it is not illustrated, click stop structures each consists of V-shaped reentrants and a V-shaped elastic protrusion, for example, is formed on the longer side and shorter side of the L-shaped groove  4   c  and the displacement member  4   d  so as to stop the displacement member  4   d  at predetermined positions including the above second position. In addition, a reentrant  8   c  which enables not to contact the projection  4   e  of the displacement member  4   d  is formed at a portion on the mounting surface  8   b  of the electronic switch module  8  facing the above second position  4   g.    
     Although, the electronic switch module  8 A at the top position in  FIG. 27  has no delay circuit, first contacts  37  (external signal input terminals) are provided on a mounting surface  8   b  thereof. Control signals from various kinds of sensors such as a motion sensor or an illumination sensor, or external electronic circuits such as a timer circuit or a radio communication circuit are inputted into the first contacts  37 . In addition, the above external electronic circuit  45  and second contacts  47  (signal output terminals) are provided on an operation handle  4 A at the top position. When this operation handle  4 A is attached to the electronic switch module  8 A, the load control switch  1  becomes a functional switch comprising a sensor function, a timer (on time and off time reservation) function or a wireless communication function. In addition, an electronic switch module  8 B at the bottom position in  FIG. 27  is the simplest load control switch having no delay circuit and no first contacts, and an operation handle  4 B thereof is the simplest operation handle having no displacement member and no external electronic circuit. In this embodiment, as well as the conventional case, it is needless to say that it can be selected among plural colors and designs for the operation handles  4 ,  4 A,  4 B. 
     Since the delay function selection switch  82  serves as a delay time setting switch in this modified example substantially, the conventional volume for delay time adjusting becomes needless, and miniaturization of housing thereof is enabled. Consequently, plural electronic switch modules  8  each having delay function can be mounted on a single installation frame  6  (SIC:  9 ). Alternatively, many electronic switch modules  8 A,  8 B can be installed on the same installation frame  6  (SIC:  9 ) with the electronic switch module  8  having the delay function, as shown in  FIG. 27 . Furthermore, price reduction of the load control switch  1  due to reduction of parts cost is enabled. 
       FIG. 28(   a ) shows a constitution example of the delay function selection switch  82 . In addition,  FIG. 28  ( b ) shows a state that the projection  4   e  of the displacement member  4   d  (see  FIG. 27)  contacts the contact face of the delay function selection switch  82 . The delay function selection switch  82  is configured to have plural electrodes  83  arranged in the first direction, and a pressure-sensitive conductive rubber  84  having a rectangle contact face that a longer side thereof corresponds to the first direction and covering whole of the arranged plural electrodes  83 . As mentioned above, the displacement member  4   d  is able to slide in the first direction along the groove  4   c , and stops at an optional first position  4   f  by the click stop structure. When the operation handle  4  is operated by a user; the push-on/push-off switch  33  is pushed on or off thereby and the projection  4   e  of the displacement member  4   d  contacts the contact face  84   a  of the pressure-sensitive conductive rubber  84 , so that the pressure-sensitive conductive rubber  84  is pressed and deformed. When a pressure is applied to the pressure-sensitive conductive rubber  84 , a pressurized portion is conducted. For example, it is assumed that adjoining two electrodes are alternately biased + and −, different electrodes or combination of different electrodes are conducted corresponding to the contact position on the contact face of the pressure-sensitive conductive rubber  84 . The delay circuit  36   b  sets a delay time corresponding to which electrodes or which combination of the electrodes are conducted, and performs a delay motion. In addition, in the case that the displacement member  4   d  stops at the second position  4   g , even when the operation handle  4  is operated, the projection  4   e  of the displacement member  4   d  does not come in contact with the pressure-sensitive conductive rubber  84 , and thus, the pressure-sensitive conductive rubber  84  is not pressed. In other words, since no electrodes are conducted, the delay circuit  36   b  judges the delay function is ineffective, and performs no delay motion. 
       FIG. 29  shows another constitution example of the delay function selection switch  82 . In this constitution example, the delay function selection switch  82  consists of plural minute push-on switches  85  arranged in the first direction. A contact portion  85   a  of the push-on switch is biased to protrude outward from a housing  86  by a spring not illustrated, so that it will be switched on only when the contact portion  85   a  is pushed into an inside of the housing  86 . Therefore, when the operation handle  4  is operated, the projection  4   e  of the displacement member  4   d  contacts the contact portion  85   a  of either push-on switch  85  and the contact portion  85   a  is pushed into the inside of the housing  86 , the delay circuit  36   b  sets a delay time and performs a delay motion. In addition, in the case that the displacement member stops at the second position  4   g , even when the operation handle  4  is operated, the projection  4   e  of the displacement member  4   d  comes in contact with neither contact portion  85   a  of the push-on switch  85 , and thus, neither push-on switch  85  is switched on. In other words, since neither push-on switch  85  outputs any signal, the delay circuit  36   b  judges the delay function is ineffective, and performs no delay motion. 
     Fourth Modified Example of the Second Embodiment 
       FIG. 30  is a drawing showing a constitution of an electronic switch module  8  in a fourth modified example. In this modified example, the electronic switch module  8  is constituted by a terminal module  2  to which electric wires  5  are connected and a switching function module. The terminal module  2  comprises the above inlets  21  and outlets  22 . The switching function module  3  is detachably attached to the terminal module, and comprises a push-on/push-off switch  33 , a control circuit  36 , a delay circuit  36   b  and a delay function selection switch  82 , and so on. 
     In this modified example, it is assumed that the terminal module  2  is installed on an installation frame  6  (SIC:  9 ) beforehand. In such a case, since the electronic switch module  8  is divided to the terminal module  2  and the switching function module  3 , a user can change or improve the function of the load control switch  1  by changing the switching function module  3  and the operation handle  4  without accompanying electrical works. 
     Applied Example 
       FIG. 31  shows an applied example of a load control switch  1  in the above third or fourth modified example. As for a load control switch in the applied example, it shows a constitution of a switch for a restroom  1 A which interlocks a lighting installation and a ventilation fan. As is generally known, the switch for a restroom which interlocks the illumination and the ventilation fan turns on the lighting installation and the ventilation fan simultaneously when a single operation handle is operated once, and turns off the lighting installation when the single operation handle is operated again and turns off the ventilation fan after passing a predetermined time period. The switch for a restroom  1 A which interlocks an illumination and a ventilation fan is constituted by an electronic switch module  8  having a delay function (a delay function module) and an electronic switch module  8 B and a single operation handle  4 C attached to two electronic switch modules  8  and  8 B simultaneously. The electronic switch module  8  is a delayed off switch module which turns on a load when the operation handle  4 C is operated as on operation and turns off the load after passing a predetermined time period when operated as off operation, in particular. The electronic switch module  8 B is the simplest electronic module having no delay circuit and no external signal input terminals. Besides, a switch module having a mechanical switch can be used instead of the electronic switch module  8 B. 
     The operation handle  4 C is an operation handle called “single” having approximately the same size as that of a rectangular opening formed on a decorative plate, for example. Two bearings  42  are formed on a rear face  41  of the operation handle  4  corresponding to bracing shafts  34  of two electronic switch modules  8  and  8 B. In addition, two projections  43  (first projections) are provided corresponding to push-on/push-off switches of the two electronic switch modules  8  and  8 B. Furthermore, a projection  4   e  is provided corresponding to the delay function selection switch  82  of the electronic switch module  8 . 
     In this way, the switch for a restroom which interlocks an illumination and a ventilation fan, which was conventionally manufactured and dispensed as exclusive use, can be constituted by combination of multi-purposed switch modules by applying the load control switches and the load control switch system in accordance with the present invention. Therefore, a large reduction in cost can be realized. 
     The invention is based on Japanese patent application 2010-261773, Japan patent application 2010-261780, Japan patent application 2010-261609 and Japan patent application 2010-261619. Furthermore, this invention is based on Japan patent application 2010-261787 and Japan patent application 2010-261631. Contents of this application should be united in the present invention referring to specifications and drawings of the above mentioned patent applications, consequently. 
     In addition, the present invention is not limited to the constitutions of the above first and second embodiments and various modified examples of the embodiments, so that various modifications are enabled for any purpose. For example, either mode in the first and second embodiments and various modified examples of the embodiments can be combined with another mode. 
     In addition, as for the simplest constitution of the switching function module  3 , a mechanical switch comprising a movable contact and a stationary contact can be recited. For example, it is considered a rocker switch (seesaw switch) that the movable contact contacts the stationary contact when an operation handle is rotated in a direction around a bracing shaft thereof and the movable contact departs from the stationary contact when the operation handle is rotated in reverse direction. In case of the rocker switch, it is desirable that the operation handle is formed symmetrical with respect to the bracing shaft. Alternatively, it is considered a mechanical push-on/push-off switch comprising a movable contact and a stationary contact (not illustrated because of public knowledge). Although These mechanical switches are low cost, though functions themselves are simple only to switch on and off of the loads. 
     In addition, although the cases using electric waves are described as the wireless signal transmission and reception function, it is not limited to those, and it may be a wireless signal transmission and reception function using infrared rays. 
     EXPLANATION OF SYMBOLS 
     
         
         
           
             A load control switch system 
               1  load control switch 
               2  terminal module 
               21  inlets 
               22  outlets 
               3  switching function module 
               31  sockets 
               32  mounting surface 
               33  push-on/push-off switch 
               34  bracing shaft 
               35  circuit board 
               36  control circuit (control circuit of electronic switch) 
               36   b  delay circuit 
               37 ,  37 A first contacts (external signal input terminals) 
               38  plug outlet 
               4  operation handle 
               4   d  displacement member 
               4   e  projection (second projection) 
               4   f  first position 
               4   g  second position 
               41  rear face 
               42 ,  42 A,  42 B bearing 
               43  projection (first projection) 
               44  circuit board 
               45  external electronic circuit 
               45   a  radio signal reception circuit 
               45   b  radio signal transmission and reception circuit 
               46  volume (light control volume/time setting volume) 
               47 ,  47 A,  47 B second contacts (output terminals) 
               48  visual indication unit (LED) 
               49  function selection switch 
               5  electric wires 
               51  core wires 
               61  motion sensor 
               62  illumination sensor 
               63 ,  64  antenna 
               65  primary battery 
               66  generation element 
               67  secondary battery 
               68  control circuit 
               7  wireless remote control device 
               71  operation button unit 
               72  control unit (control signal output unit) 
               73  transmission and reception unit 
               74  indication unit (load control state informing unit) 
               75  built-in battery 
               76  informing unit 
               77  battery running out detection unit 
               8  electronic switch module 
               82  delay function selection switch 
               83  electrodes 
               84  pressure-sensitive conductive rubber 
               84   a  contact face 
               9  installation frame 
               11  bracing shaft 
               12 A to  12 C,  13 A to  13 C movable units