Lighting systems for road vehicles

Claim 1

A lighting system for a road vehicle, comprising in combination a battery having one terminal grounded, a direction indicator switch having a movable contact selectively engageable with first and second fixed contacts, a flasher unit, circuit means coupling said movable contact of the direction indicator switch to the battery through said flasher unit, first and second flasher lamps positioned at the left-hand side and right-hand side of the front of the vehicle respectively, third and fourth flasher lamps positioned at the left-hand side and right-hand side of the rear of the vehicle respectively, first and second stop lamps positioned at the left-hand side and right-hand side of the rear of the vehicle respectively, a circuit connection from said first contact of the direction indicator switch through said first flasher lamp to ground, a circuit connection from said second fixed contact of the direction indicator switch through the second flasher lamp to ground, a further connection between said first fixed contact of the direction indicator switch and ground, said connection including in series a first diode and a first relay winding, a first capacitor bridging said first relay winding, a first relay contact operable by said first relay winding, a brake switch on the vehicle, said brake switch being closed when the brakes of the vehicle are operated, a circuit connection from said battery through said brake switch, said first relay contact, and and then the first stop lamp and the third flasher lamp in parallel to ground, a circuit connection from said second fixed contact of the direction indicator switch to ground and including in series a second diode and a second relay winding, the second capacitor bridging the second relay winding, a second relay contact operable by said second winding, a circuit connection from the battery through the brake switch and said second relay contact, and then through the second stop lamp and fourth flasher lamp in parallel to ground, and said first relay contact serving when the first relay winding is energized to disconnect the first stop lamp and third flasher lamp from the brake switch and to connect the first stop lamp and third flasher lamp to the first fixed contact of the direction indicator switch, and said second relay contact serving when the second relay winding is energized to disconnect the second stop lamp and fourth flasher lamp from said brake switch, and to connect the second stop lamp and fourth flasher lamp to the second fixed contact of the direction indicator switch.