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The weight of the door may be 400 lb (180 kg) or more but is balanced by either a torsion spring system or a pair of extension springs. [2] A garage door opener is controlled motorized mechanism for opening garage doors adds convenience, safety, and security often used with a remote or a button on wall. [3]
The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.
Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.
Garage Door Sectional Torsion Spring A mousetrap powered by a helical torsion spring Video of a model torsion pendulum oscillating. A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted.
Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.
In 2001, U2 filmed the music video for "Stuck in a Moment You Can't Get Out Of" inside the Astrodome. In the 2004 movie Friday Night Lights, the Astrodome hosted the 1988 5A Football State Championship between the Permian Panthers and the Carter High Cowboys. (The actual 1988 game was a state semifinal and was played elsewhere.) [69]
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