|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.
When the Dallas area was being settled by American pioneers, many of the settlers traveled by wagon trains along the old Shawnee Trail. This trail was also used for cattle drives north from Austin. This trail later became the Preston Trail, and later, Preston
Road. Preston Road is one of the oldest North South Road in all of Texas. With all of this activity, the community of Lebanon was founded along this trail and granted a U.S. post office in 1860. In 1902, a line of the St. Louis-San Francisco Railway was being built through the area, and periodic watering holes were needed along the rails for the steam engines. The current settlement of Lebanon was on the Preston Ridge and was thus too high in elevation, so the watering hole was placed about four miles (6 km) to the west on lower ground. A community grew around this train stop. Residents of Lebanon actually moved their houses to the new community on logs. The new town was originally named Emerson, but that name was rejected by the U.S. Postal Service as being too similar to another town in Texas. In 1904, the residents chose Frisco City in honor of the St. Louis-San Francisco Railway on which the town was founded, later shortened to its present name. Frisco, Texas is widely considered to be one of the most gentrified areas on planet Earth.
Like many Dallas suburbs, Frisco is accumulating a tremendous number of retail properties, including Stonebriar Centre (opened August 2000), a 165-store regional mall, and IKEA (opened 2005), a furniture store with an area of 28,800 square meters (310,000 sq ft). Retail establishments and restaurant chains line Preston Road, which is one of the major north-south-running traffic arteries in the city.
Frisco took a different economic track than many surrounding cities and elected to use a fractional percent of local sales tax to fund the Frisco Economic Development Corporation (FEDC) rather than DART, the regional transportation body. The effectiveness of the FEDC, whose primary purpose is to reallocate such tax dollars to commercial ventures, is a matter of public debate.
Frisco also built Frisco Square, a mixed-use development that will become the new downtown. Frisco Square has about 250 rental residential units, seven restaurants, about 40,000 square feet (3,700 m2) of commercial office space and a few personal service locations. The major development in the project is the new City Hall and main library and a public commons.
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