Abstract:
An interconnectable 3-way switch system for electric cable wiring is provided for controlling a fixture. First and second switch enclosures each have an input port and an output port and a toggle switch. Each switch enclosure has a cam having cam arms movable between a first position where the arms electrically connect and close return bus cam contact points of adjacent return bus segments and a second position where the arms electrically connect and close a power bus cam contact point of a power bus segment to a return bus segment. The first switch enclosure has the cam arms in the first position and the second switch enclosure having the cam arms in the second position. Each switch enclosure has a segmented power bus, a segmented second power bus, a segmented return bus and a ground bus extending between input ports and said output ports.

Description:
This is a continuation-in-part application of Libby II, U.S. patent application Ser. No. 11/454,556, filed Jun. 16, 2006 now U.S. Pat. No. 7,211,751. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a switch for electric cable wiring. More specifically, it relates to a pre-wired switch provided in an enclosure which allows for a simplified installation of various configurations of single pole electrical switches and three-way electrical switches in residential and commercial electrical wiring applications. 
   2. Description of the Prior Art 
   The wiring of three-way electrical cable switches so that one may turn a light on and off from two different locations is an extremely complex and time-consuming process. Even highly skilled electricians who all are familiar with such wiring arrangements must sometimes stop and think before completing this task. The complexity is caused primarily by the fact that there are identical switch light components which must be connected together with different wiring arrangements depending upon the relative location of each of the individual components and where the power feed comes from. Even with the more straightforward single pole switch, there are two different wiring configurations depending on whether the power from the breaker box first enters the switch or first enters the light itself. 
   Prior to the present invention, it has not been possible to provide a single fully enclosed switch housing or enclosure which would have the versatility for the same switch to be used in a variety of different wiring configurations. Having a fully enclosed switch enclosure is highly desirable as it saves considerable time, energy and expense of having an electrician manually connect wires to appropriate contact points on the switch. Further, and more importantly, the safety factor of utilizing a totally enclosed switch which is inaccessible to the installer is greatly increased over existing products and methods of electrical wiring. With the present invention, there is no possibility that an electrician or installer would be tempted to “test” a wired circuit before properly installing all box covers as there are no removable box covers. Thus, both risks of fire and electrocution are greatly reduced. 
   The concept of providing a modular system wherein male plugs would simply be inserted into corresponding female ports built into a prewired switch is suggested by Libby, U.S. Pat. No. 5,785,551. The Libby &#39;551 patent teaches that it is desirable to reduce and simplify the number of steps required in wiring an electrical power distribution system and to make electrical connections without the need to strip the ends of the individual conductors in an electrical cable.  FIGS. 1 through 10  show the typical manner in which the electrical wiring of a receptacle was accomplished in the past. FIGS. 11a-d and 12 of Libby &#39;551 show and describe the use of a box into which male cable plugs are inserted into female connectors  46  provided in the box to simplify the wiring of the box. Applicant hereby incorporates by reference Libby, U.S. Pat. No. 5,785,551. The present invention relates to a new and improved box which includes a switch to provide greater flexibility and versatility than envisioned in the Libby &#39;551 application. 
   SUMMARY OF THE INVENTION 
   The present invention in its simplest form adapted for use with a single pole switch provides a switch for electric cable wiring comprising: a) an enclosure having an input port and an output port; b) a main toggle switch; c) a cam having cam arms, said cam movable between a first position wherein said arms electrically connect and close contact points of adjacent return bus segments and a second position wherein said arms electrically connect and close a contact point of a power bus segment to a return bus segment; d) a power bus extending in segments between said input port and said output port, said power bus having a main contact point selectively opened and closed by said toggle switch, said power bus having a power bus cam contact point selectively opened and closed by said cam; e) a return bus extending in segments between said input port and said output port, said return bus having return bus cam contact points selectively opened and closed by said cam; and f) a ground bus extending between said input port and said output port. 
   Preferably, the enclosure has an exterior and said input port and said output port are accessible from the exterior of the enclosure and the input port and said output port each provide a separate and independent connection to said power bus, said return bus and said ground bus. Preferably, the enclosure is factory sealed and has an interior which is inaccessible to an installer. 
   Preferably, the cam has three arm members. Preferably, one cam arm member has an electrically insulating material on one side thereof. Preferably, the cam has a shaft adapted for rotation between said first position and said second position. Preferably, the cam has a shaft which extends at least partially through an exterior of the enclosure and can be rotated between said first position to said second position from a location outside the enclosure. Preferably, the cam has an arm member which has a wedge like side surface for urging apart and opening a contact point on one of said bus segments when said cam is rotated between said first and said second position. 
   When the present invention is utilized in connection with the more complex three-way switch the switch further comprises: g) a second power bus, said second power bus extending in segments between said output port and said power bus; and h) an auxiliary cam, said auxiliary cam having auxiliary cam arms and movable between a first auxiliary cam position wherein said auxiliary cam arms do not contact any bus and a second auxiliary cam position wherein said auxiliary cam arms electrically connect any contact point of said second power bus to a contact point of said power bus. 
   Preferably, said auxiliary cam has two arm members. Preferably, said auxiliary cam includes an auxiliary cam shaft adapted for rotation between said first auxiliary cam position and said second auxiliary cam position. Preferably, said auxiliary cam has an auxiliary cam shaft which extends at least partially through an exterior of the enclosure and said cam can be rotated between said first auxiliary cam position to said second auxiliary cam position from a location outside the enclosure. Preferably, said auxiliary cam has an auxiliary cam arm member which has a wedge like side surface for urging apart and opening a contact on one of said bus segments when said auxiliary cam is rotated between said first auxiliary cam position and said second auxiliary cam position. 

   
     BRIEF DESCRIPTION OF THE FIGURES 
       FIG. 1  is a schematic diagram of a prior art circuit for a three-way switch having a first switch, a second switch and a light with power entering the first switch. 
       FIG. 2  is a schematic diagram of a prior art circuit for a three-way switch having a light, a first switch and a second switch with power entering the light and then going to one switch. FIG.  2 ′ is a schematic diagram of a circuit according to the present invention for a three-way switch having a light, a first switch and a second switch with power entering the light and then going to one switch. 
       FIG. 3  is a schematic of a prior art circuit for a three-way switch having a first switch, a light and a second switch with power entering the light and then going to both switches. 
       FIG. 4  is a top plan view of a three-way switch according to the present invention. FIG.  4 ′ is a top plan view of an alternative embodiment of a three-way switch according to the present invention 
       FIG. 5  is a perspective view of the three-way switch of  FIG. 4 . FIG.  5 ′ is a perspective view of the three-way switch of FIG.  4 ′. 
       FIG. 5   a  is an enlarged view of a portion of  FIG. 5  showing the details of the main switch, the first cam and the auxiliary cam.  FIG. 5   a ′ is an enlarged view of a portion of FIG.  5 ′ showing the details of the main switch and a single cam C 2 . 
       FIG. 6  is a top plan view of a first switch according to the present invention having a first cam in a first position and having an auxiliary cam and a first auxiliary cam position. FIG.  6 ′ is a top plan view of an alternative embodiment of a first switch according to the present invention having a single cam in a first cam position. 
       FIG. 7  is a top plan view of a second switch according to the present invention having a first cam in a first position and having an auxiliary cam in a first auxiliary cam position. 
       FIG. 8  is a top plan view of a second switch according to the present invention having a first cam in a second position and having an auxiliary cam in a second auxiliary cam position. FIG.  8 ′ is a top plan view of an alternative embodiment of a second switch according to the present invention having a single cam in a second cam position. 
       FIG. 9  is a top plan view of a first switch and a second switch according to the present invention having a first cam in a second position and having an auxiliary cam in a first auxiliary cam position. 
       FIG. 9   a  is a typical wiring diagram for the 4-conductor port P 3  of  FIG. 9 . 
       FIG. 10  is a schematic diagram of a prior art circuit for a single pole switch having a first switch and a light with power entering the first switch. 
       FIG. 11  is a schematic diagram of a prior art circuit for a single pole switch having a light and a first switch with power entering the light. 
       FIG. 12  is a top plan view of a single pole switch according to the present invention having a single cam. 
       FIG. 13  is a perspective view of the single pole switch according to  FIG. 12 . 
       FIG. 14  is a top plan view of a single pole switch according to the present invention showing the cam in a first cam position. 
       FIG. 14   a  is a perspective view of the single pole switch of  FIG. 14 . 
       FIG. 15  is a top plan view of a single pole switch according to the present invention showing the cam in a second cam position. 
       FIG. 15   a  is a perspective view of the single pole switch of  FIG. 15 . 
       FIG. 16  is a top plan view of the cam of the present invention. 
       FIG. 17  is a side perspective view of the cam of the present invention. 
       FIG. 18  it is a perspective view of the back of a sealed receptacle for the three-way switch of the present invention. 
       FIG. 19  it is a perspective view of the front of the switch of  FIG. 18 . 
       FIG. 20  is a perspective view of the back of a sealed receptacle for the single pole switch of the present invention. 
       FIG. 21  is a perspective view of the front of the switch of  FIG. 20 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The present invention has utility in the installation of three-way electrical switch circuits as well as in the installation of single pole electric switch circuits. Three-way switch circuits will be described first. The purpose of a three-way switch is to be able to control the flow of electric current from two different locations. An example of this would be a light fixture located in the middle of a hall way and you turn the light on as you enter the hallway at one end and then turn the light off when you exit the hallway at the other end. This is done using two three-way switches. 
   Referring to  FIGS. 1 ,  2  and  3 , three different ways or applications are shown for the use of three way switches. A first application is shown in  FIG. 1 . The source of power or electricity  100  enters a first three-way switch enclosure  300  and connects to a first three way switch  310  by way of a two conductor cable with a ground called Romex® or NM (non metallic) cable. The power then travels to the next three-way switch  302  enclosure and connects to the second three way switch  312  by way of a three conductor cable with a ground. From there, power is delivered to the light  200  enclosure and connected to the light  210 , a number of lights, or any controlled device via the 2 conductor with ground cable. 
   Referring now to  FIG. 2 , a second application is shown. The power source  100  enters the light fixture enclosure  200  and is connected to the light  210  first and then travels on to the first three-way switch enclosure  300  and connects to the first three-way switch  310  and then to the second three-way switch enclosure  302  and connects to the second switch  312 . 
   Referring to  FIG. 3 , a third application is shown. The power source  100  enters the light fixture enclosure  200  first via a two conductor cable with ground and then goes to two separate three-way switches,  310  and  312  by way of two separate three conductor cables with ground. 
   The current method of wiring switches, receptacles, light fixtures, or any electrical device, is done by terminating the NM cable into a box and hard wiring it to the electrical devise, then mounting the devise in the box. NM (non metallic cable) comes in various wire sizes or gauges with a number of conductors within its outer jacket. When wiring a three-way switch, four conductors in the NM cable are required. The individual conductors are color coded; black, red, white, and a ground wire that has no jacket or insulation indicated by the color green. The red and black wires are often called traveling wires because the current travels back and forth between the two 3 way switches via these wires and is controlled by the main switch. In order for any electrical circuit to function properly the electrical current has to return back to the power source, making a complete loop, or circuit. This is normally done by the neutral (white) wire. As used in this application, references in the Figures to BK, WH, RD ad GN are intended to make reference, respectively, to the black, white, red and ground wires of a Romex or other nonmetallic cable. 
   The four individual conductors are mechanically attached to the back of the switch to four different terminations. The ground is always connected to the same terminal which is marked “ground” and is usually indicated by a green screw. The other three conductors, black, red, and white however, can be terminated to any of the other three terminals determined by the application being used as previously described. The electrician therefore, has to make his terminations according to the desired application. 
   The switches of the present invention will not be like the conventional switch. It has been previously explained how the wires have to be connected to the back of a conventional switch and then the switch has to mounted into a box. The present switch is complete and factory sealed in its own box (which is called an enclosure) with a receptacle and terminals to accept a newly designed connector. The use of a new connector being developed by Aslan Industries which will be sold under the trademark Q-CEB™ (also referred to as a Quick-Connect Electrical Box) connectors will allow the electrician or end user to simply plug the NM cable into the back of the designed enclosure for the switches. As used in this application, the term “quick connector” refers to a structure similar to that described in Libby, U.S. Pat. No. 5,975,938 (FIG. 1) or in Libby et al., United States Patent Application, Publication No. 2005/0064759 A1 (FIG. 1) or any similar device which provides a male (or female) connector on the terminal end of a NM cable to allow for a plug in type connection to a switch box, receptacle box or other electrical device. 
   Because a “quick connector” is used, the labor performed in making mechanical connections on the switch is eliminated. However, the three-way switch still has to function in any of the three applications described above with respect to  FIGS. 1 ,  2  and  3 . To accomplish this, the three-way switch has to be configured and designed so that all three applications of the wiring circuits may be performed. This is accomplished by the use of internal bussing and cams within the switch. Upon installation, the installer will set the cams on the back of the switch according to the application being applied described in directions included with every switch. 
   The following descriptions will explain how setting the cams can direct the flow of current and thus allow the switch to be correctly utilized in any of the three applications shown in  FIGS. 1 ,  2 , and  3  which show different ways that three-way switches are used. 
   To examine the overall switch and its parts reference is first made to  FIGS. 4 ,  5  and  5   a  which generally show the internal grid, cams, and parts that make up the three-way switch.  FIG. 4  shows a top view and  FIG. 5  shows a perspective side view of the switch. There are three ports, P 1 , P 2 , and P 3 , in the back of the switch that will accept “quick connect” connectors to transfer the current from the cable to the bussing in the switch. The metal bussing A, B, C, &amp; D, will carry the current from one port to another through various contact points  1  thru  21 . As will become more apparent, bussing segments A, C and D are not continuous but rather are formed to have multiple segments with ends of each segment forming a contact point. The main switch M 1  controls the entire circuit. When M 1  is in one position the contact point at  4  will be closed and point  5  will be open. As used in this application, the term “open” means that juxtaposed ends of adjacent bussing segments are not in electrical contact with one another but rather are spaced apart and separated by either air or by a solid insulating member inserted there between. In contrast, the term “closed” means that juxtaposed ends of adjacent bussing segments are in physical contact with one another and make an electrical connection. 
   When M 1  is thrown in the opposite direction, contact point  4  will open and contact point  5  will close. This action “flip-flops” the flow of current through the switch allowing the two switches to control the circuit. Finally, we have a set of cams marked C 1  which designates the auxiliary cam and C 2  which designates the first cam, along with special bussing, allows this three-way switch to be used in all three applications of circuitry from one self-contained electrical enclosure (box). These cams can be turned, using a screw driver, from the back side of the switch. The auxiliary cam C 1  will have an insulating wedge on the bottom of both contact points  8  and  9 , which will also be wedged shaped. This will make it possible to open the split busses C and D when put in the position needed for the application, and also allow the current to follow the correct path or bus according to the desired application. The first cam C 2  has a wedge shaped insulator and contact point at  10  allowing the split bus C to open at point  3 . This allows the current to flow only in the direction stated for the desired application. 
   The use of the present invention will now be described with respect to some specific applications. Application  1  utilizes a circuit having an electrical wiring schematic as shown in  FIG. 1 . The electrical current  100  is brought first to the boxes  300  and  302  which contain switches  310  and  312 , respectively, and then to the box  200  in which the light fixture  210  is mounted.  FIG. 6  and  FIG. 7  show switch enclosures  300  and  302 , respectively, and the positioning of the auxiliary cam C 1  and cam C 2  for this circuit. For switch enclosure  300  to turn the light on, the main switch M 1  is in position shown. Current will enter port P 1  at  17  from the power source, travel along bus C and through contact points  3  and  4 . Point  5  will be open. Current continues through point  6  which will be closed and to  18  located in P 3 . The current exist the switch enclosure  300  through a “quick connect” connector on to the other three-way switch enclosure  302 , via a four conductor cable and second “quick connect” connector. 
   In  FIG. 7  the main switch M 1  is in the position shown and all points along bus C are closed. Current will enter port  3  and at  18 , travel through bus C to  17  and out through a “quick connect” connector that is inserted into port P 1  and to the light  210  or devise you want to control. In this first application, the current travels through the light and to the neutral wire connected to the light and back to port  15  of the switch enclosure  302  in  FIG. 7 . With the cam C 2  in the position shown, the current will flow along bus A without interruption and back to switch enclosure  300 . Entering switch enclosure  300  at port P 3 , point  21 , the current, travels through bus A and points  2 ,  1 , and  15 , and back to the power source making the complete trip and completing the circuit. To turn the light off, the main switch M 1  in either switch enclosure  300  or  302  is thrown in the opposite direction opening the circuit and breaking the “loop”. To turn the light back on at switch enclosure  300 , throw main switch M 1  in the opposite direction, this opens  4  and closes  5  allowing current now to flow through bus D and on to switch  302  to port P 3 , point  20  through points  5 ,  4 ,  3 , and on to  17  and then to the light  210 . Note that port P 2  is only used for a feed through, meaning that port P 2  allows the user to feed power to other devices, (switches, junction boxes, etc.). This port P 2  can be used in two applications, namely, the applications shown in  FIG. 1  and  FIG. 2 . 
   Application  2  utilizes a circuit having an electrical wiring schematic as shown in  FIG. 2 . In this circuit, the electric current  100  first enters the box  200  in which the light  210  is wired and then goes to the three-way switch enclosures  300  and  302 . In this application, the white wire going from the light  210  to the switch enclosure  300  will be wired such that it will carry the current. Our directions will simply describe how to terminate the Romex in our connector. In switch enclosures  300  and  302  the cams will be set in the position shown in  FIG. 6  and  FIG. 8 . Current coming from the light fixture box  200  will enter switch enclosure  300  ( FIG. 6 ) at port P 1 , point  15  and travel through bus A and points  1 ,  12  and  11  on cam C 2 , to points  2 ,  21 , and out of port P 3  traveling to switch enclosure  302  ( FIG. 8 ) via a four conductor cable. Current will enter port P 3  at  18 , travel along bus C to  6 , at  6  the auxiliary cam C 1  will position point  8  at  6  allowing current to flow over to bus D or continue along bus C determined by the position of main switch M 1 . The main switch M 1  can then cause the (flip-flop) or switching of current flow in a manner well known with knuckles  320  and  322 . If the main switch M 1  is in the position shown in  FIG. 8 , the current will travel from  6  to  4 , to point  3 , and with the auxiliary cam C 1  in position shown, travel through  10  and  12  to point  2 . At point  2 , the current flows through bus A, into port P 3 , to  21 , through a “quick connect” connector and back to switch enclosure  300  the 4 conductor cable to port P 3  and point  18 . The current will continue through bus C, through  6 ,  4 ,  3 ,  17 , out of P 1  and back to the light fixture box  200  to complete the “loop” and turn the light  210  on. The main switch M 1  in either switch enclosure  300  or  302  can be thrown in the opposite direction to “break”, or interrupt the circuit and turn the light  210  off. This is accomplished by main switchvM 1  opening either point  4  or  5 . Turning the light  210  back on from switch enclosure  302 , the current flow will be as follows: Main switch M 1  is now in the opposite direction, opening point  4  and closing  5 . Current will flow from  6 , through  8  on auxiliary cam C 1 , to point  9  on the auxiliary cam C 1 , to  5 , and along bus D to point  20  in port P 3 . From there it will travel through the red wire in the four conductor cable back to switch enclosure  300  entering port P 3  at  18 , travel through bus D to point  5 , to  4 ,  3 ,  17  in port P 1 , and to the light fixture box  200  completing the “loop” once again and energizing the light  210 . 
   Application  3  utilizes a circuit having an electrical wiring schematic as shown in  FIG. 3 . In this circuit, the power is fed to the light fixture  200  first. It is then fed to the two switch enclosures  300  and  302  by way of two separate four conductor cables. Although this application is rarely used, we still must provide a way to apply this method. The auxiliary cam C 1  and cam C 2  are set in the same position in both switch enclosures  300  and  302  as shown in  FIG. 9 . In this application, the current  100  will come from the light fixture box  200 , go to one switch enclosure  302 , make a loop, and back to the other switch enclosure  300  and then return to the light  210 . The black wire in the light fixture box will be connected to the white wire of the four conductor cable that will carry the current to the switch enclosure  303 . In port P 3  at  21 , current will travel along bus A to points  2 ,  12 ,  10 , and point  3  on bus C. It will then travel either to bus D at point  4  or continue on bus C to  6 , depending on which position the main switch M 1  is in. When main switch M 1  is in the position shown in  FIG. 9 ,  5  is open and the current will flow in bus C, to  6 , to  18 , out of port P 3  to the black wire and to switch enclosure  300 . Entering switch enclosure  300  at  18  traveling along bus C through  4  to  3 , through the cam C 2 , points  10  and  12  to  2 , through bus A to  21 , out of port P 3  and back to the light fixture  200  completing the circuit and turning the light  210  on. Flipping the main switch M 1  in either switch enclosure  300  or  302  will open point  4 , opening the circuit and turning the light  210  off. Point  5  is now closed allowing the current to flow through bus D. If main switch M 1  in switch enclosure  300  is in the opposite position shown and the light is now off, switch enclosure  302  can turn the light  210  back on and the current will flow as follows. Current still enters at port P 3 , point  21 , travels along bus A through points  2 ,  12  and  10 , to  3  and up to  4 . Point  4  is now open by the main switch M 1  and point  5  is closed so the current will now flow over to bus D and travel through  5  to  20 , out of port P 3  through the red conductor to port P 3  in switch enclosure  300  at  20 , along bus D to  5 , over to  4  which is also open causing the current to flow to  3 ,  10 ,  12 ,  2 , through bus A, to  21 , out of port P 3  via the white wire and back to the light  210  completing the circuit once again and energizing the light  210 . 
   The present invention also has utility in the installation of single pole switch circuits. For this application, only a single cam C 2  is utilized. The single pole switch, although simple in design, has two basic wiring applications. In application  1 , shown in  FIG. 10 , the circuit can be wired in a way that the power source  100  can feed the switch  410  in switch enclosure  400  first and then to the light fixture  200 . In application  2 , the power may enter the light fixture  200  and then the switch enclosure  400 . The wiring schematics are shown in  FIG. 10  and  FIG. 11 , respectively. Single pole switches also use Romex or NM (non metallic) cable and is always a three conductor cable consisting of a black and white wire and a bare ground wire. The black is the current carrying or “hot” conductor and the white is the “neutral” which carries the current back to the power source.  FIGS. 14 and 14   a  and  FIGS. 15 and 15   a , respectively, shows the internal grid and the cam C 2  that will be used to allow the two applications to be applied using a “quick connect” connector. This newly designed switch enclosure  400  enables the electrical contractor not only to utilize both applications of circuitry, but also decreases time and labor costs. 
     FIG. 10  shows the wiring schematic for the first application.  FIG. 14  And  FIG. 14   a  show the internal busing, the cam C 2  and its configuration, and the contact points for this circuitry. Current flowing from the power panel, or source, will first enter the switch  400 ,  FIG. 14 , at port P 1  at point  17 . It will travel along bus C to point  3 . CamC 2  is in the position shown and main switch M 1  is in the “on” position, closing point  6  and allowing current to flow through the busing to point  20 , out of port P 4 , and to the light fixture  200 . It continues through the light  210  to the white or neutral wire and back to the switch ( FIG. 14 ) at port P 4 , point  18 . The current continues through the A bus to point  2 ,  11  and  12  on the cam C 2 , to point  1 , to  15 , then travels back to the power source completing the “loop” or circuit. Turning the light  210  off is simply done by throwing the main switch M 1  to the “off” position thereby “opening” the circuit at point  6 . 
     FIG. 11  shows the wiring schematic for the second application. In this application, the power source  100  feeds current to the light fixture box  200  first and then travels to the controlled switch  400 .  FIG. 15  and  FIG. 15   a  represent the bus system, the cam C 2 , the main switch M 1 , the contact points, and the ports. Looking at  FIG. 15  and  FIG. 15   a , we follow the current. The power  100  comes through the light fixture  200  and goes to the switch enclosure  400  entering port P 4  at  20 . It travels along the C bus through point  6 . The contact point  6  is closed when the main switch M 1  is in the “on” position, and the current flows to point  3 . The cam C 2  is now in the position shown by setting before installation, contacting points  3  and  10 . The contact point at  10  will be wedged in shape, insulated on the bottom, and will come between the split bus of C, or open the contacts at point  3  allowing current to only flow through the cam C 2 . Current will now flow through the auxiliary cam points  11  and  12 , on to point  2 , to bus A, and then to  18  in port P 4 . From port P 4  back to the light fixture  200  and return to the power source, completing the circuit. The main switch, M 1 , is thrown in the “off” position to open contact point  6 , stopping the flow of current, and turning the light or device off. 
   Referring to  FIG. 16 , a top plan view of the cam C 2  is shown. Cam C 2  includes arm members  10 ,  11  and  12  which extend radially outward from a main shaft  150 . The top of the shaft  150  is provided with a groove  160  into which a screw driver or other device may be inserted to allow the camshaft  150  to be rotated from a location outside of the factory sealed enclosure in which the cam C 2  is housed. As shown In  FIGS. 16 and 17 , and insulating wedge member I is provided on a lower surface of the end of arm member  10 . 
     FIG. 18  and  FIG. 19  show, respectively, a perspective view of the bottom and top surfaces of a sealed switch enclosure  300 . A main toggle switch M 1  is provided on the top surface and ports P 1 , P 2  and P 3  are provided on the bottom surface. A groove provided in an end of each of auxiliary cam C 1  and first cam C 2  are also accessible from the bottom surface. 
     FIG. 20  and  FIG. 21  show, respectively, a perspective view of the bottom and top surfaces of a sealed switch enclosure  400 . A main toggle switch M 1  is provided on the top surface and ports P 1 , P 2 , P 3  and P 4  are provided on the bottom surface. A groove provided in an end of cam C 2  is accessible from the bottom surface. 
   As previously discussed, there are three different ways to wire a 3-way switch. Applications  1 ,  2 , and  3  have all been presented and the wiring schematics were shown in  FIGS. 1 ,  2 , and  3 , respectively. Also, and previously explained, we used an auxiliary cam (C 1 ) and the first cam (C 2 ). In this section which follows, the use of a 3-way switch which eliminates the need or use of the auxiliary cam (C 1 ) will now be explained. 
   In paragraph [0044] above, the parts and functionality of switch of the present invention was explained. The same holds true for the following discussion. Referring to application  2 , as shown in  FIG. 2  (wiring schematic) and in  FIGS. 6 and 8 , the current flow through the bussing of switches  300  and  302  will be traced. In this circuit, the electric current  100  first enters the box  200  in which the light  210  is wired and then goes to the three-way switch enclosure  300 . A single cam. (C 2 ) in each switch is set in the position shown in FIGS.  6 ′ and  8 ′. Instructions that will be included in all switches will show the installer or electrician which terminals to connect the four conductor cable to and how to match up the terminal to the appropriate ports of the switches to achieve the following current flow path. In FIG.  6 ′ the current enters Port (P 1 ) at point  17  and travels through bus C through points  3  and  4 . The main switch M 1  is in position shown. At  18  the current then travels out to switch  302  (FIG.  8 ′) via another 4 conductor cable and enters switch  302  at Port (P 3 ) and at point  21  traveling along the A bus through point  2  and  12 , across the cam C 2  to point  10  and  3 . From there it will travel to  4  along bus C and either continues through bus C to  18  or goes over to point  5  on bus D. This will be determined by the main switch (M 1 ). In the case with M 1  in the position shown in  FIG. 8 , the current will flow along buss C to  18  out through the cable, and back to switch  300  entering P 3  at point  21 , travel along buss A to points  2 ,  11 ,  12 ,  1  and to  15  in P 1 . From P 1  it goes back to the light fixture  210  in enclosure  200  turning the light on and returning to the power source which is the power supply panel. At this time, the main switch (M 1 ) in either  300  or  302  can turn the light off by throwing the switch in the opposite direction. M 1  which directs the current flow causes this “flip-flop” action allowing either switch  300  or  302  to control the light. By bringing the current in the switch at different points it is possible to direct the current through the switches allowing the circuit to function as it should in any application with the use of just one cam. Again directions will explain where to place the colored wire conductors to achieve the desired application and direct the current flow. 
   It is to be understood that while certain forms of the present invention have been illustrated and described herein, the present invention is not to be limited to the specific forms or arrangements of parts described and shown.