Power window Totally Explained

Everything about Power Window totally explained

Power windows or electric windows are automobile windows which can be raised and lowered by depressing a button or switch, as opposed to using a hand-turned crank handle.
The first electric power windows were introduced around 1946 by Lincoln. (External Link

) These are driven by a small electric motor inside the door and have come to be universal in the industry. Prior to that date, in the few vehicles offering this feature, the windows were driven by hydraulics or off the engine vacuum. In the 1950s, electric power was also applied to the tailgate window, in many station wagons.
   In a typical installation, there's an individual switch at each window and a set of switches in the driver's door, so the driver can operate all the windows. However, some models like Saab and Holden have used switches located in the center console, where they're accessible to all the occupants. In this case, the door-mounted switches can be omitted.
   Power windows are usually inoperable when the car isn't running as the electrical system isn't 'live' once the ignition has been turned off. However, many modern cars have a time delay feature, first introduced by Cadillac in the 1980s, called retained accessory power. This allows operation of the windows and some other accessories for ten minutes or so after the engine is stopped. Another fairly recent innovation, pioneered by Nissan at about the same time, is the express-down window, which allows the window to be fully lowered with one tap on the switch, as opposed to holding the switch down until the window retracts.
   Power windows have come under some scrutiny after several fatal accidents in which children's necks have become trapped, leading to suffocation. Some designs place the switch in a location on a handrest where it can be accidentally triggered by a child climbing to place his or her head out of the window. To prevent this, many vehicles feature a driver-controlled lockout switch, preventing rear-seat passengers (usually smaller children) from accidentally triggering the switches. This also prevents kids from using them as toys.
   The American National Highway Traffic Safety Administration claims to be working on power window safety regulations, but hasn't established a date for their introduction.

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