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The company has production units in United States, Czech Republic and China. U.S. manufacturing is based in Monroe, North Carolina . Besam originated as a manufacturer of automatic doors for the healthcare sector in 1962, and expanded its portfolio with automated sliding door systems in the 1970s as well as revolving doors in 1985.
The invention was patented and installed in Wilcox's Pier Restaurant in West Haven, Connecticut for the benefit of waiters carrying plates of food and drink. The entire system plus installation was sold for $100. [3] [4] In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960 ...
The company was divided into six divisions: Door Control, Automatics, Glass, Movable Walls, Security Systems & Trade Counters. Dorma’s head office in Ennepetal controlled 69 wholly owned companies in 45 countries. Its major production plants were located in Europe, China, Malaysia, North and South America.
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To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs. Historically, elevator doors were opened using simple harmonic motion by a set of mechanical linkages; the motor, geared down, would rotate linked arms, which in turn would drive the door.
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A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
Swing side, door mounted sensor—mounted on the swing side of the door itself, used as the door is opening to detect a user in the way of the opening door. In that case, the operator stops the door. The sensitivity of infrared sensors must be reduced at the end of the opening angle, if it starts seeing a wall next to the door, so it may not ...