|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.
The community was first settled in the early 1840s. In 1842, Thomas Keenan, Isaac B. Webb, and William Cochran received original land grants
in the area. By 1843, a community called Mustang Branch had been established. Mr. Cochran later changed the name to Farmers Branch to reflect the area's rich soil and
farmland. Farmers Branch was the first location of the Texan Land and Emigration Company (or Peters Colony) in 1845. This made the community one of the best known places in Dallas County during the 1840s because of its advertising throughout Europe and the United States. Baptist minister William Bowles opened a blacksmith shop and gristmill in 1845. On May 5, 1845, Isaac B. Webb donated land for Webb's Chapel Methodist Church, the first formal place of worship in Dallas County. A school was established in the church one year later. Webb became the first postmaster at the Farmers Branch post office, which opened on January 5, 1848. It continued to function until its closure in 1866. The post office reopened in
1875. To assure that railroads would eventually pass through Farmers Branch, prominent early settler Samuel Gilbert and others sold right-of-way through their land in
1874. Around three to four years later, the Dallas and Wichita Railway completed a track from Dallas – through Farmers Branch – to Lewisville. It was absorbed by the Missouri–Kansas–Texas Railroad in 1881. The community had a population of approximately 100 by 1890 with several businesses. The population had grown to 300 during the early
1900s. A brick school building was constructed in 1916. The number of people living in the community remained stable until after World War II.
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