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An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.
Another type of surface mounted door closer is attached to the door frame behind the door (where the hinges are) next to the middle hinge. The "arm" (tail) rests against the door, and a spring that is twisted by the user opening the door closes the door by returning to its pre-twisted shape.
A pocket door handle is a recessed rectangular insert, typically with operating hardware called a door pull. [25] Door handles can also be called "handle sets". In addition there are door handles that are flush-mount and require pressing rather than turning or gripping, and there are touch-free, electronic, and motion-sensor door handles.
Door stop – used to prevent the door from opening too far or striking another object [3] Espagnolette (for a window) Fingerplate; Letter box or mail slot; Peephole; Kickplate [5] A number of items normally accompany doors but are not necessarily mounted on the door itself, such as doorbells.
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.
This is exactly the same principle as a child safety door lock which is installed on car doors. Electric strikes on AC may allow someone outside the door to hear when the door is unlocked. A buzzing noise is typically made by applying alternating current (AC) to the strike instead of direct current (DC). When using a DC powered strike, the ...