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A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.
A typical single-car garage roller door has a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door. Oversized roller doors in commercial premises are not sprung (except in the US), and a manual pulley and chain system or a geared motor is used to raise and lower (roll up and roll down) the door.
The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.
A roller shutter or sectional overhead door is one variant of this type. ... door. (Australian Standards for Installation of Timber Doorsets, AS 1909–1984 pg 6.)
Truck loading dock with overhead door, dock leveler, dock seals, canopy, indicator lights, and truck restraint system. In order to facilitate material handling, loading docks may be equipped with the following: [1] Bumpers – protect the dock from truck damage, may also be used as a guide by the truck driver when backing up.
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Overhead Doors and Metal Buildings: MBMA has been working with the Door and Access System Manufacturers Association (DASMA) for the past several years to create better doors and openings for metal buildings. Five years of collaboration and research has focused on rolling steel overhead doors and the effects of wind on the doors and the building ...
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