|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 first known settlers in the Carrollton
Texas area were William and Mary Larner, who arrived in 1842. In that same year, Isaac Webb visited the area and returned to his home in Missouri with samples of the local soil.
In 1843, Isaac Webb and his wife, Mary Hughes Webb left Barry County, Missouri, to settle in this area. Four weeks after their departure, they crossed the Red River into Texas. Moving in with Mary's brother and his wife, they began to build their new home in Texas.
The A.W. Perry family claimed their headright in 1844. Both the Larners and the Perrys were from Carrollton, Illinois, and the name came to be used for the growing settlement here. A.W. Perry established a mill here in partnership with Wade H. Witt.
Sometime in the 1840's the Webbs and other settlers sought the services of a circuit-riding preacher. The Webbs donated their cabin for religious services, and it came to be known locally as Webb's Chapel. Webb Chapel lives on as the name of a major Carrollton
Agriculture was the first major industry in the area, and some of the first buildings here were the grist mills established on the Elm fork of the Trinity River. The mills on the Trinity are remembered today with Trinity Mills Road that runs through
Carrollton's first school was established in 1856, and the railroad (Dallas & Wichita RR) arrived in 1881. The next year, it was noted in the Texas Gazeteer that Carrollton boasted a population of 500 and one steam grist mill, four cotton gins, two churches and two schools.
In 1890, Carrollton's first telephone was installed. A local cotton patch was being replaced as a location for several new businesses, and in 1900, the area was platted as the town square. Carrollton's old town square still exists, surrounded by colorful local businesses. In 1902, Carrollton's first bank was established.
By 1921, Carrollton TX had both a volunteer fire department and a Chamber of Commerce. In 1924, Carrollton was connected with Dallas, when the Texas Inter-Urban railway established its electric train service between the two communities. Carrollton was now unique in the area in having three separate rail lines and services meeting at the local depot. This access to rail transport would be a powerful force in the growth of Carrollton through the 1950's.
By 1935, Carrollton had its first City Hall, water mains and fire hydrants, and a sewer system. By now, the city was a major processor and shipper of grain and cotton.
1950 saw Carrollton with a population of around 1,600, but the city was to grow substantially over the next four decades. Growth was substantial in the 1970's when population grew to over 40,000 and much of the city's current housing was built.
Carrollton continues to thrive and grow today. The city is estimated to have over 122,000 residents today.
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