|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.
|Denton County was established by the Texas legislature on April 11, 1846, shortly after Texas abandoned its dream of being a Republic and joined the United States.
Early pioneers settled along the Trinity River and its tributaries and on the edge of the frontier as it moved westward. The first Anglo settlements were near Hebron in the southeast corner of what would become Denton County, Pilot Point in the northeast and Little Elm on the eastern border with Collin County.
Settlers were scarce, however, until the Republic of Texas approved an impresario grant in 1841 with the Texas Emigration and Land Company based in Louisville, Kentucky. W.S. Peters led the group of twenty investors, and the grant became known as the Peters Colony. The contracts eventually covered all of Northeast Texas. The colony's land office was established near Hebron in the southeast corner of present-day Denton County.
After Texas joined the union, promises of U.S. Army protection from marauding Indians prompted a new wave of immigration.
The new county, carved out of Fannin County, was named for John B. Denton, a pioneer preacher and lawyer who had been killed in an Indian fight in 1841. The pioneers chose a county seat along Pecan Creek and named it Pinckneyville, in honor of Texas' first governor. Historians differ on whether a courthouse was ever built at Pinckneyville. A 1908 history of the county describes a log courthouse built there, while another history says there were "no improvements" and court was held under a large oak tree.
Pinckneyville lasted only two years. Water shortages forced the fledgling community to move, first in February 1848 to a new site they named Alton a few miles south and again in late 1848 to another site near Hickory Creek. The Hickory Creek location also was named Alton and it remained the seat of Denton County government for about ten years.
By 1856, the little settlement of Alton was thriving. Alton boasted several homes, a blacksmith shop, three stores, a saloon, hotel and bar, two doctors, several lawyers, and a cemetery, and was headquarters for the Denton County Land District.
By 1857, however, Denton Texas County was ready to move the county seat again. County residents wanted a county seat more central to the settlements in Pilot Point in the north and Lewisville in the south. Alton residents voted to move again. This time they called the new county seat Denton. Lots for the original township of Denton were auctioned on January 10, 1857.
The first courthouse in Denton TX was a two-story frame structure on the north side of the downtown square. The building burned in 1875, destroying most of the county records. A brick courthouse was then built in the center of the square, a two-story building with a tall central tower. Lightning damaged that building and it was condemned and demolished in 1894. Construction of the present Courthouse-on-the-Square began in 1895. The cornerstone was laid in 1896, and the courthouse was dedicated in 1897.
For a decade, Denton County was on the northeast Texas frontier. Cattle and horses ranged on the unfenced prairies. Residents were engaged in ranching and subsistence farming. John S. Chisum, who became the most famous cattleman in the West, operated his first ranch in Denton County. He later moved to new ranges on the Concho River in Texas and on west into New Mexico.
Many Southerners came to the Dallas TX area to rebuild their fortunes after the war. They could no longer maintain plantations, but the farm land of North Texas meant opportunity. Dallas
Texas continued to grow during the Reconstruction years, unlike other Southern towns that had to rebuild first. Dallas had also become the center of the buffalo market.
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