Abstract: A roller activated switch with an unlimited number of triggering points, a preferred embodiment featuring linear activation by a rod upon the roller. The switch unit receives a moveable member upon the roller in its housing. The moveable member rolls a spring-biased roller to an off center position, thus activating or deactivating contacts upon any movement of the moveable member beyond a small increment. The switch rapidly responds to any reversing movement of the moveable member upon the roller no matter what absolute position the moveable member is in, at the time, thus having an unlimited number of changeable triggering points independent of contact pressure and having an overtravel limited only by the length of the moveable member. This feature results in the switch having the ability to establish its own triggering points. Thus, absolute triggering becomes automatic.

Abstract: An improved system for lighting an automobile central rear window warning, or "third" red light, employs an unlimited linear motion switch coupled to the accelerator-carburetor linkage and a logic unit coupled to the switch and the electric lines for the conventional brake, turn signal and back-up signal maps, and, optionally, to a clutch switch, so as to light the "third" warning lamp. The linear switch unit receives a rod in its housing, which rod is coupled to the carburetor or accelerator linkage. The rod rolls a spring-mounted roller to an off center position, thus activating or deactivating a pair of contacts upon any movement of the rod beyond a small increment. The linear switch rapidly responds to any reversing movement of the accelerator pedal, no matter what absolute position the rod is in at the time.