Emergency warning light switching system

Claim 2

In an emergency warning light switching system for motor vehicles, employing the vehicle head lamps for the warning lights, the improvement comprising: first means for generating a series of energizing pulses; second means, responsive to the pulses generated by said first means, for delivering said energizing pulses alternately to said vehicle headlamps, said second means including a first logic gate circuit and a pair of amplifiers coupled in series with said logic gate circuit for delivering alternate amplified pulses to said headlamps; and third means connected to said first logic gate circuit, for simultaneously energizing said headlamps irrespective of the application of said energizing pulses to said headlamps, so as to provide an emergency light over-ride to said lamps, wherein said simultaneous energizing third means comprises a second logic gate circuit connected to said first logic gate circuit, and means for delivering a supply voltage to said second logic circuit, whereby the application of an energizing signal to one of said first and second logic circuits will energize said headlamps.

Claim 3

An emergency warning light switching system according to claim 1, wherein said pulse generating means comprises a unijunction transistor oscillator and said second means further includes a bistable flip-flop connected in series with said unijunction transistor oscillator, and further including means for delivering an energizing voltage to said oscillator and to said flip-flop, the output of said flip-flop being coupled to said pulse delivering amplifiers.

Claim 4

An emergency warning light system according to claim 2, wherein said first logic gate circuit includes first and second diodes connected to the respective outputs of said flip-flop and further including first and second symmetrically arranged transistors connected between said diodes and said amplifiers, for amplifying the output of said diodes.

Claim 5

An emergency warning light system according to claim 3, wherein said second logic gate circuit includes third and fourth diodes connected to said first and second transistors for delivering an over-ride signal to said transistors irrespective of the application of alternate pulses thereto from said first and second diodes.

Claim 6

An emergency warning light system according to claim 4, wherein each amplifier in said pair of amplifiers comprises a Darlington connected amplifier.

Claim 7

An emergency warning light system according to claim 5, further including a differentiator network connected between the output of said unijunction transistor oscillator and the input of said flip-flop.

Claim 8

An emergency warning light system according to claim 6, further including a by-pass bias network connected between said energizing voltage delivering means and said flip-flop.

Claim 9

An emergency warning light switching system for a motor vehicle, particularly one employing the vehicle headlamps for the warning lights, comprising: first means for generating a series of pulses; second means, having a pair of outputs and having an input connected to receive said pulses generated by said first means, for providing a series of alternate energizing pulses at said pair of outputs in response to the pulses generated by said first means; third means, having a pair of inputs, which are separately connected to the outputs of said second means, for delivering alternate ones of said energizing pulses to a pair of lamp terminals for alternately energizing lamps connected thereto; and fourth means, connected to both inputs of said third means, for supplying an over-ride input signal to each input of said third means, to provide an energizing signal to both lamp terminals, irrespective of the generation of pulses by said first means, wherein said first means comprises a transistor oscillator cIrcuit, said second means comprises a bistable element, connected to said transistor oscillator, for providing said series of alternate energizing pulses at the pair of outputs thereof, said third means comprises a first logic circuit and a pair of amplifier circuits coupled in series with said first logic circuit, and wherein said fourth means comprises a second logic circuit connected to said first logic circuit, and means for delivering a supply voltage to said second logic circuit, whereby the application of an energizing signal to one of said first and second logic circuits will energize said headlamps.

Claim 10

An emergency warning light switching system for a motor vehicle, particularly one employing the vehicle headlamps for the warning lights, comprising: first means for generating a series of pulses; second means, having a pair of outputs and having an input connected to receive said pulses generated by said first means, for providing a series of alternate energizing pulses at said pair of outputs in response to the pulses generated by said first means; third means, having a pair of inputs, which are separately connected to the outputs of said second means, for delivering alternate ones of said energizing pulses to a pair of lamp terminals for alternately energizing lamps connected thereto; and fourth means, connected to both inputs of said third means, for supplying an over-ride input signal to each input of said third means, to provide an energizing signal to both lamp terminals, irrespective of the generation of pulses by said first means, wherein said first means comprises a transistor oscillator cIrcuit, said second means comprises a bistable element, connected to said transistor oscillator, for providing said series of alternate energizing pulses at the pair of outputs thereof, said third means comprises a first logic circuit and a pair of amplifier circuits coupled in series with said first logic circuit, and wherein said fourth means comprises a second logic circuit connected to said first logic circuit, and means for delivering a supply voltage to said second logic circuit, whereby the application of an energizing signal to one of said first and second logic circuits will energize said headlamps.

Claim 11

An emergency warning light switching system according to claim 8, wherein said first logic circuit includes first and second diodes connected to the respective outputs of said bistable element and further includes first and second symmetrically arranged transistors connected between said diodes and said amplifiers for amplifying the output of said diodes.

Claim 12

An emergency warning light switching system according to claim 9, wherein said second logic circuit includes third and fourth diodes connected to said first and second transistors for delivering an over-ride signal to said transistors irrespective of the application of alternate pulses thereto from said first and second diodes.