Electric switches

Claim 1

An ignition distributor and contact breaker assembly for a spark igniTion internal combustion engine having an electronically controlled fuel injection system, said assembly comprising a distributor body containing a contact breaker for initiating ignition pulses, a shaft rotatably supported in said body and adapted to be driven in timed relationship with the internal combustion engine, means secured to the shaft for periodically opening and closing the contact breaker, a distributor cap containing a plurality of contacts one of which is adapted to be connected to an ignition coil of the internal combustion engine and others of which are respectively adapted to be connected to spark ignition devices of the internal combustion engine, and a rotor arm arranged to be driven by said shaft and arranged to sequentially distribute the ignition pulses from said one contact to the other contacts, characterized in that there is further provided an electric switching device for producing timed trigger signals for the electronically controlled fuel injection system, said switching device being in the form of a unit comprising a housing of plastics materials having one of its oppositely disposed faces shaped to fit on and locate with the face of the distributor body disposed towards the distributor cap and having the other of its oppositely disposed faces shaped to receive and locate with the underside of the distributor cap, at least one electric switch fixedly mounted in the annular housing, and a rotary member arranged to effect periodic opening and closing of the electric switch whereby to produce said timed trigger signals, the rotary member including a hub portion which fits coaxially between, and is keyed to, said rotor arm and the end of said shaft.