|A garage door opener is a motorized device that opens and closes garage doors. Most are controlled by switches on the garage wall, as well as by remote controls carried in the garage owner's cars
The electric opener
The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. Contrary to popular belief, the electric opener does not provide the actual lifting power to open and close a heavy garage door. Instead, most of the actual lifting power comes from the counterbalance springs that are under tension to lift the garage door via steel counterbalance cables. The electric opener only controls how far the door opens and closes, as well as the force the garage door exerts. In most cases, the garage door opener also acts as a lock.
The typical electric garage door opener consists of a power unit that contains the electric motor. The power unit attaches to a track. A trolley connected to an arm that attaches to the top of the garage door slides back and forth on the track, thus opening and closing the garage door. The trolley is guided along the track by a chain, belt, or screw that turns when the motor is operated. A quick-release mechanism is attached to the trolley to allow the garage door to be disconnected from the opener for manual operation during a power failure or in case of emergency. Limit switches on the power unit control the distance the garage door opens and closes once the motor receives a signal from the remote control or wall push button to operate the
The entire assembly hangs above the garage door. The power unit hangs from the ceiling and is located towards the rear of the garage. The end of the track on the opposite end of the power unit attaches to a header bracket that is attached to the header wall above the garage door. The power head is usually supported by punched angle iron.
The first garage door opener remote controls were simple and consisted of a simple transmitter (the remote) and receiver which controlled the opener mechanism. The transmitter would transmit on a designated frequency; the receiver would listen for the radio signal, then open or close the garage, depending on the door position. The basic concept of this can be traced back to World War II. This type of system was used to detonate remote bombs. While novel at the time, the technology ran its course when garage door openers became widely available and used. Then, not only did a person open their garage door, they opened their neighbor’s garage door as well. While the garage door remote is low in power and in range, it was powerful enough to interfere with other receivers in the area.
The second stage of the wireless garage door opener system deals with the shared frequency problem. To rectify this, systems required a garage door owner to preset a digital code via dip switches on the receiver and transmitter. While these switches provided garage door systems with 28 = 256 different codes they were not designed with high security in mind; the main intent was to avoid interference with similar systems nearby.
The third stage of garage door opener market uses a frequency spectrum range between 300-400 MHz and most of the transmitter/receivers rely on hopping or rolling code technology. This approach prevents perpetrators from recording a code and replaying it to open a garage door. Since the signal is supposed to be significantly different from that of any other garage door remote control, manufacturers claim it is impossible for someone other than the owner of the remote to open the garage. When the transmitter sends a code, it generates a new code using an encoder. The receiver, after receiving a correct code, uses the same encoder with the same original seed to generate a new code that it will accept in the future. Because there is a high probability that someone might accidentally push the open button while not in range and desynchronize the code, the receiver generates look-a-head codes ahead of time.
The fourth stage of garage door opener systems is similar to third stage, but it is limited to the 315 MHz frequency. The 315 MHz frequency range avoids interference from the Land Mobile Radio System (LMRS) used by the U.S. military.
Hurst is a city in Tarrant County, Texas, United States. Hurst is one of the Mid-Cities between Fort Worth and Dallas, but a suburb of Fort Worth. The population was 36,273 at the 2000 census. It was founded by William Letchworth Hurst.
HURST, TEXAS. Hurst, just to the north of Fort Worth, is on State Highways 121 and 10, north of the West Fork of the Trinity River in the northeastern quadrant of Tarrant County. By the middle or late 1840s farmers were beginning to settle within what are now the confines of Hurst. Isaac Parker's log cabin, purchased in 1853, lay just outside what is now the southwestern corner of Hurst, and the Parker family cemetery is now within the city limits. Important among the settlers who moved there after the Civil War were Tennessee families, especially that of William L. Hurst, and Indiana families, including those of Daniel Arwine and Jeff Souder. The Indiana clans established a church and school at the site in the late 1870s and thereafter the community always supported at least one church and one school. The Arwine farming and ranching community grew slowly until the Rock Island line was built through in 1903. William Hurst donated land in exchange for the establishment of a depot named for him. The Rock Island at first labeled the site Hurst, but there was already a Hurst in Coryell County that had a post office. So the budding Tarrant County community was soon named Ormel; it had a post office from 1904 to 1909. The community was renamed Hurst in 1909. The depot and its stationmasters and telegraphers operated for some thirty years. Yet there were probably no more than twenty people in downtown Hurst between 1910 and 1920, and the area's agricultural products-cotton, grain, and cattle-were not enough to make the train stop regularly. Sand and gravel excavations began south of Hurst in the Trinity riverbottoms early in the 1900s; larger round-the-clock operations began in the 1920s. Illegal whiskey was brewed along the wooded river too, selling for about $10 a gallon during prohibition, 1919–1933. After 1903 there was at least one general store in the community, and during the 1930s and 1940s a handful of grocery stores, filling stations, and cafes opened. The Work Projects Administration erected a brick school in 1940, and the population of Hurst numbered perhaps 100. By the 1940s Hurst was becoming a bedroom community for Fort Worth. Its post office was revived in 1949.
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