Abstract:
In the exemplary embodiment, an attachment is mounted to the switch housing and supports stationary supply terminals which extend through the switch housing to make sliding and wiping contact externally of the housing with the terminals of an indicator lamp carried by the switch operator when the latter is moved to a designated position.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to electric switches which provide a visual indication of a specified condition of the switch, and more specifically to the current commutation means for illuminated indicators where the indicator is a lamp carried by a movable switch operator and it is desired to commutate current to the lamp when the operator is in a designated position. Various devices have been proposed which afford engagement of the lamp terminals with the supply terminals when the operator is moved by orienting the supply terminals in the path of movement of the lamp terminals. While such prior devices have been useful for their intended purposes, the present invention relates to improvements thereover. 
     SUMMARY OF THE INVENTION 
     It is a general object of the present invention to provide improved current commutation means for illuminated indicators carried by a movable switch operator. 
     Another object is to provide an attachment for supporting and properly orienting stationary supply terminals to afford full sliding and wiping engagement externally of the switch housing with the terminals of a lamp carried by the operator when the latter is moved to a designated position. 
     Another object is to provide an attachment of the aforementioned character which routes the supply terminals through the switch housing to not only afford maximum utilization of available space but, furthermore, require only a minimum amount of additional space. 
     Another object is to provide an attachment of the aforementioned character enabling the use of a light emitting diode (LED) as the illuminated indicator. 
     Other objects and advantages will hereinafter appear. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross-sectional view of the preferred embodiment of the present invention, with the attachment shown in elevation. 
     FIG. 2 is a side elevation view of the device of FIG. 1. 
     FIG. 3 is a top elevation view of the device of FIG. 1 with the rocker button omitted. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     There is shown in FIG. 1 a rocker switch generally designated 2, with an attachment 4 for commutating current to an indicator lamp, preferably a light emitting diode (LED) 6, carried by rocker button 8 when the rocker button is leftwardly tilted. 
     Rocker switch 2 is known in the art and will be only briefly described. A housing 9 is provided with an insulating case 10 having stationary contact terminals 12 mounted therein for engagement by a teeter-totter type contactor 14 centrally supported on fulcrum 16. The housing includes an enclosure 18 covering the open top of the case and extending partially down the sides of the case and crimped into undercuts. Flanges 20 are provided for mounting to a panel or the like. Front and rear upstanding triangular tabs 22 extend from enclosure 18 and have a pivot pin 24 extending therebetween for pivotally mounting rocker button 8. The rocker button is generally T-shaped with its trunk portion extending down through an aperture 26 in the enclosure interiorly of the housing. A downwardly opening cylindrical bore 28 in the button receives a plunger 30 downwardly biased by compression spring 32 into engagement with the teeter-totter contactor 14. As can be recognized by those skilled in the art, multiple poles, plungers, etc., are possible with this type of contact mechanism. Other types of operators and contact mechanisms are of course within the scope of the present invention. 
     There is provided an attachment 4 having: a lower vertical portion 34 adjacent the left exterior side wall of the housing; a middle horizontal portion 36 which extends rightwardly from the top of portion 34 through an opening formed in the housing specifically therefor such that horizontal portion 36 extends interiorly of the housing; and a top vertical portion 38 which extends upwardly from the right end of horizontal portion 36 exteriorly of the housing. The attachment is made of insulating material and supports a pair of stationary electrical supply terminsl 40 and 42. As seen in FIG. 2, an insulating dividing wall 44 separates the lower vertical portions of the terminals, and insulating dividing wall 46 separates the middle horizontal portions of the terminals, and an insulating dividing wall 48 separates the uppeer vertical portions of the terminals to thereby electrically isolate supply terminals 40 and 42. The lower portions of the terminals are to be connected to a source of electrical power. A right side wall 50 of the attachment lies flat against the left wall of the housing to insulate the terminals therefrom. Along the horizontal middle portion of the attachment there are provided outer insulating and mounting walls 52 and 54 with rivets 56 and 58 extending therethrough for holding the attachment in assembled condition. 
     The rocker button has an aperture 60 extending therethrough in which is mounted LED 6, the top thereof being flush with the outer top surface of the button. The LED terminals 62 extend down through the aperture to make sliding and wiping contact with supply terminals 40 and 42 when the rocker button is leftwardly tilted. The upper portions of the supply terminals, FIG. 2, are inwardly bent to provide firm engagement with the LED terminals. One of the LED terminals slides between terminal 40 and insulating wall 48 and the other LED terminal slides between terminal 42 and wall 48 to thus commutate current to the LED. 
     An LED is preferred because it allows aperture 60 to be very small and gives the desirable visual effect of only a point of light and this small area of illumination is preferred on instrument panels, etc., where many of such indicators may be present and glare or excessive intensity of illumination is not desirable. An LED is also preferred because LED terminals are of sufficient gauge and strength to be stiff enough to slide directly into engagement with the supply terminals without the need of extra intermediary parts, as may be required by incandescent lamps, thus cutting cost. 
     By routing the supply terminals through the housing, the present invention affords not only a simple, low-cost, space-saving attachment but also the desirable advantages of full sliding and wiping of the current commutating surfaces. 
     A second light source, such as another LED, may be mounted in the other end of the rocker button, and another attachment may be provided at the right side of the housing to afford an illuminated indication of another circuit condition of the switch when the rocker button is rightwardly tilted. 
     It is recognized that various modifications are possible within the scope of the invention defined in the appended claims.