|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.
Keller is a city located in Tarrant County, Texas (USA). It is a wealthy northern suburb of the city of Fort Worth and is part of the Dallas-Fort Worth Metroplex. The population is 37,685 at the year of 2007, but 2010 estimates have been released and been reported as the population will be reaching 40,127
Establishment of Keller
The Texas and Pacific Railway between Fort Worth and Texarkana was completed in June 1881, and the first train ran on this track on 9 May 1881. With the advent of rail service, new villages were established all along the line. The Keller of today was one of them.
On 19 July 1881, H.W. Wood, a druggist of Tarrant County, set aside 40 acres (0.16 km2) out of the north end of the 62 acres (0.25 km2) deeded to him by A.C. Roberts (being a part of the Samuel Needham Survey) for a town site to be known as Athol, situated 14 miles (23 km) northeast of Fort Worth. The land was dedicated to the public for street and alleyways, but title to the remainder of the 62 acres was held by Mr. Wood.
Settlers migrated to the new village, and before a year had passed the name of the town was changed from Athol to Keller, honoring John C. Keller, a foreman on the railroad. Streets were named and those in the original 40-acre (0.16 km2) site still carry the names given to them in 1881. Streets going north and south are Lamar, Main and Elm; those running east and west are Price, Taylor, Hill, Vine, Bates, Olive and Pecan.
New residential development is expanding the city in all directions. The 1980 Census calculated Keller's population at 4,555; today, about 40,000 residents call Keller
home. The city planned for its growth and has recently constructed a new town hall, municipal service center, recreation and aquatic center, and has expanded the police and municipal court facility and is currently working on a major expansion to the City Library. Keller Independent School District has 36 campuses serving more than 30,000 students. The district serves portions of the cities of Colleyville, Fort Worth, Haltom City, Hurst, North Richland Hills, Southlake, Watauga, and Westlake and the entire City of Keller. Its 51 square miles encompass the third-largest land area in Tarrant County, and its tax rate of $1.6080 per $100 appraised value is the one of the lowest school tax rates in the county. Enrollment in the school district has doubled during the past ten years and is expected to do the same during the next decade, making it the ninth-fastest growing school district in
Money Magazine rated Keller TX as one of the top 10 "Best Places to Live" in the United States for 2009, ranked number 7.
American Community Survey listed Keller as one of the "Nation's Richest Cities" with a population over 20,000 in 2008, ranked number 59 with median household income of $114,542. Neighboring Southlake was ranked number 1
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