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2. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   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.

3. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   The most remarkable is the shear lock, where the armature does not directly pull off the face, but the load is instead in shear, like a mechanical stop. The shear magnetic lock allows a door to swing in both directions, as opposed to the original (and now ubiquitous) direct pull type, which normally works either in an in-swing or out-swing ...

4. List of How It's Made episodes - Wikipedia

   en.wikipedia.org/wiki/List_of_How_It's_Made_episodes

   Blast doors: Lipstick: Artificial palm trees: Brass plaques: October 31, 2013 22-05: 278: Carbon fibre: Antique frame restoration: Railcar movers: Hood ornaments: November 7, 2013 22-06: 279: Sawhorses and toolboxes: Sorbet pops: School buses: November 14, 2013 22-07: 280: Sanders: Solid terrain models: Stucco: High-speed roll-up doors November ...

5. Doorstop - Wikipedia

   en.wikipedia.org/wiki/Doorstop

   A newer version of equipping the door with the stopping mechanism is to attach a magnet to the bottom or top of the door on the side which opens outward, which then latches onto another magnet or magnetic material on the wall or a small hub on the floor. The magnet must be strong enough to hold the weight of the door, but weak enough to be ...

6. Kojak - Wikipedia

   en.wikipedia.org/wiki/Kojak

   The system had a protective electric loop for windows and doors. A break-in and cutting wires would cause an alarm to sound. The device operated on a 12-volt battery and included extra loud "B" bell, heavy-duty weather-resistant cabinet with built-in tamper resistant circuit, 125' of double stranded wire, six sets of magnetic switches, two keys ...

7. Electric strike - Wikipedia

   en.wikipedia.org/wiki/Electric_strike

   Also called fail-open. In this configuration, applying electric current to the strike will cause it to lock. It operates the same as a magnetic lock would. If there is a power failure, the door opens merely by being pushed or pulled. A new trend is a strike that is quickly reversible from fail safe to fail secure (and back again if needed).