|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 neighborís 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.
|Immigrants of European descent began arriving into the Allen
Texas area in the early 1840s in search of free land, traveling the Texas Road and the Central National Road, constructed by the Republic of Texas. A stage line ran from Bonham through McKinney to Allen and Plano, crossing Rowlett Creek where SH 5 now crosses. Allen was part of the Peterís Colony Land Grant from the Republic of Texas to the Texas Emigration & Land Company.
The Houston and Texas Central Railroad (H&TC), constructed through Allen in 1872, laid out the original township of
Allen TX. The H&TC was acquired by J.P. Morgan & Company in 1877 and by the Southern Pacific in 1883. In 1918, the H&TC erected a combination freight/passenger depot in the Allen Central Business District.
The first train robbery in Texas took place in Allen on February 22, 1878, when Sam Bass and his associates pillaged the train. Allen was a short ride from their hideouts in the Elm Trinity brush lands.
In 1907, the Texas Traction Company (Interurban) purchased right-of-way on the west side of the H&TC main line track and constructed an interurban line through Allen as a stop on its route from Denison to Dallas in 1908. In 1915 a devastating fire destroyed most of the business district between the interurban tracks and the railroad.
Tornado Damage Texas Electric Railway, the successor to TX Traction Company, ceased operations on December 31, 1948, and the population of Allen declined to 400 in 1950. The town was officially incorporated in 1953 and Home Rule Status was adopted in 1979, with a Council/Manager form of government. The construction of highway US 75 in 1960 had a similar impact on Allenís future as the railroad almost a century before. In the 1980s, Developmental Learning Materials and InteCom, Inc. relocated to Allen, leading the way for further corporate startups and
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