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Besam was an international supplier and manufacturer of automatic entrance equipment for commercial, health care and residential buildings owned by Assa Abloy. [1] The product portfolio included automatic doors, automatic swing doors, sliding doors and revolving doors, as well as air curtains and dedicated service and maintenance.
Modern manual door closer Eclipse door spring and separate checking mechanism. 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.
Chamberlain — the company's do-it-yourself line of garage door openers. LiftMaster — the company's line of garage door openers for professional installers. Raynor — the company's line of garage door openers for professional installers. This line of professional installers is slightly less common than LiftMaster.
Assa Abloy was founded at the merger of the two companies Assa and Abloy in 1994. Assa stands for August Stenman Stenman August. [7] [8] The name Abloy comes from a contraction of the Swedish Finnish bilingual name Ab Låsfabriken Lukkotehdas Oy, meaning literally Corp. Lock Factory Lock Factory Corp. (first Corp. and Låsfabriken from Swedish, last Lukkotehdas and Corp. from Finnish).
In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s.
Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.
Andersen Corporation is an international window and door manufacturing enterprise employing 12,000 people at more than thirty manufacturing facilities, logistics centers, and company owned retail locations. Andersen is a private company headquartered in Bayport, Minnesota. [1] [2]
The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position.
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