|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 Town of Addison is located in an area once called Peters Colony. It was settled as early as 1846 when Preston Witt built a house on White Rock Creek. The area was not known as Addison until 1902. Addison was named after Addison Robertson, who served as the community's second postmaster from 1908-1916. In 1902, the first industry was introduced to Addison when a cotton gin was built on Addison Road, near the railroad, by the Pistole brothers. It became the Plano Cotton Oil Mill in 1904 and the Farmers Gin of Addison in 1919.
Addison Texas was named after Addison Robertson, who served as the community's second postmaster from 1908-1916.Located on Belt Line Road is the Addison School Building which was built in 1914. In 1954, the school was annexed and became a part of the Dallas Independent School District. The school, which was closed in 1964, now serves as the Addison Magic Time Machine Restaurant.
The City of Addison TX was incorporated on June 15, 1953, under an alder-manic form of government and was changed to the "Town of Addison" in 1982. Addison's first Mayor was M.W. Morris and the aldermen were Guy Dennis, Robert W. Wood, J.E. Julian, Jr., Dr. H.T. Nesbit and Seldon Knowles.
In 1975, an election to allow liquor by the drink served in town was a major attribute to the expansion of businesses and restaurants. All combined, Addison's restaurants and eating establishments can seat over 20,000 patrons at one time.
In 1978, the Town of Addison Texas constructed its first town park, and by 1980 an aggressive beautification program was under way. Today, Addison's 118 acres of parks are some of the finest in Texas, each uniquely themed and beautifully landscaped.
During the late 1970's and early 1980's, Addison experienced explosive growth. Today, the business and daytime population typically reaches up to 100,000 a day.
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