Because no power is flowing, the resistor and the bimetallic spring rapidly cool to the point where the other metal pressing to reform itself into the arched shape wins, and there is another snap as it once again bends back into shape and re-connects the terminals, starting the process over again. Eventually, the heat builds enough where the metal trying to straighten itself out wins the battle and the bimetallic spring straightens, disconnecting the two terminals.Īt this point, no electricity is flowing and the lights are off. The result is that when current is flowing (when you turn on the blinker), the resistor heats up the arched bimetallic spring which in turn is connecting the two terminals, allowing the lights to come on.Īs it heats up, one of the metals begins to try to straighten itself out as it expands, but initially can’t because the other metal is holding it in its arched form. This is attached to a bimetallic spring- essentially an arched strip made up of two sandwiched metals with very different thermal properties, one that expands quite a bit as it warms and the other that doesn’t. The core of this switch includes a resistor that heats up when current flows through it. While there are several different designs out there for turn signal switches, they classically used some form of a thermal switch (in this case called a thermal flasher). By the end of WWII, directional signals were standard in most American automobiles. In its original incarnation, this turn signal only flashed the rear lights by the next year, front lights were flashing as well. automaker Buick first introduced the “Flash–Way Directional Signal,” which operated in the familiar way – a stick, mounted on the steering column. Walz, Jr., although no one was interested in it either, at least until after his patent expired 14 years later. The first modern directional signal was patented in 1925 by Edgar A. Neither did the mechanical signaling device invented by silent-film star Florence Lawrence in 1914, which, after a button was pushed by the driver, a sign would pop up from the rear bumper indicating which way the car was turning.
#Auto turn signal flasher drivers#
Motor vehicle directional signals have been around almost as long as cars, and as early as 1909, a device was patented that had hand-shaped lights that indicated to other drivers which way a vehicle intended to travel.
asks: Do car blinkers click naturally or is there some mechanism added to make the clicking noise to let you know your blinker is on?
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