|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.
In 1976, in response to environmental concerns over rapidly increasing automobile traffic congestion, together with a rise in the popularity of cycling, Flower Mound residents first proposed adding a system of recreational and commuter
bike paths in and around the town. Initially, funding proved elusive, but by 1989 the first three miles of bicycle trails had been constructed, in part due to a grant from Texas Parks and Wildlife.
Eventually, more than 30 miles of paved hiking and bicycling paths would be constructed throughout the town.
In 1990 there were slightly over 15,000 people living in Flower Mound and its population had tripled during that
During the 1990s the town's population was growing at a rate of nearly 13% per year. Flower Mound was the nation's 10th fastest growing community during the 1990s - growing from 15,527 to
50,702. In 2000-2002, Flower Mound was ranked 9th among the 100 fastest growing cities in United States with a population greater than
50,000. This growth has led to efforts to limit further development in the town to maintain rural characteristics, avoid low income development, and keep a more natural environment.
In 1999, the town adopted the SMART growth (acronym representing "Strategically Managed And Responsible Town Growth") management plan, a smart growth initiative to manage both the rate and character of development in the
community. However, Flower Mound's population continued to rise by approximately 5% per year during the 2000-2005 period. The town also encourages conservation development projects to protect and preserve existing open space, vistas and natural habitats while allowing for controlled growth. The goal is environmentally sensitive urban development and the mitigation of the ill-effects of urban sprawl and affordable housing. While more controlled growth can be seen in the central and western portion of Flower Mound open space is still slowly disappearing. Traffic continues to increase on the two lane roads and highways in Flower Mound and especially in Northwest Flower Mound in the new retail district on the corner of FM 2499 Long Prairie RD and FM 407 Justin RD. Critics including former mayor Lori DeLuca charge that shopping centers, grocery stores, housing developments and other projects continue to replace rural land, and the current administration places less emphasis on preservation as opposed to growing the tax base.
D Magazine has consistently ranked Flower Mound in the Top 10 suburbs to live in Dallas-Ft. Worth. In 1995, it was ranked 6th, in 2004 was ranked 8th, in 2008 was ranked
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