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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]
Planar four-bar linkages are constructed from four links connected in a loop by four one-degree-of-freedom joints.A joint may be either a revolute joint – also known as a pin joint or hinged joint – denoted by R, or a prismatic joint – also known as a sliding pair – denoted by P. [Note 1]
Autoreclosers are made in single-phase [6] and three-phase versions, using oil, vacuum, or sulfur hexafluoride (SF 6) interrupters.Controls for the reclosers range from the original electromechanical systems to digital electronics with metering and SCADA functions.
Sometimes, door closer mechanisms ensure fire doors remain closed. An additional fire risk is that doors may prevent access to emergency services personnel coming to fight the fire and rescue occupants, etc. Fire fighters must use door breaching techniques in these situations to gain access.
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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.
Wall-mounted electromagnetic door holder securing a door in the open position. An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.
A lever lock. Mortise locks may include a non-locking sprung latch operated by a door handle. Such a lock is termed a sash lock.A simpler form without a handle or latch is termed a dead lock.
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