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Dorma was a German company that produced door technology systems and allied products. ... door closers, door furniture and fittings, window handles, hinges and locks;
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.
KABA key. dormakaba Holding AG (former Kaba Holding AG) is a global security group based in Rümlang, Switzerland.It employs more than 15,000 people in over 50 countries. It formed as the result of a merger between former Kaba and former Dorma in September 2015 and is publicly traded on the SIX Swiss Exchange.
Best Lock Corporation was an American publicly traded door hardware and lock manufacturer. Founded in 1925 as Best Universal Lock Company by Frank Ellison Best, the privately held company relocated from Seattle, Washington, to Indianapolis, Indiana, in 1938, where operations expanded and evolved.
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. The motor opens and closes the door through ...
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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