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The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...
A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 December 2024. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including exterior doors of residential and commercial buildings, internal doors, cupboard ...
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]
It is a spring-loaded bolt with an angled edge. [1] [2] When the door is pushed closed, the angled edge of the latch bolt engages with the lip of the strike plate; a spring allows the bolt to retract. Once the door is fully closed, the bolt automatically extends into the strike plate, holding the door closed.
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Americans no longer reserve the term door handle for cars and use knob everywhere else, but now define it as follows: A door knob is a door opening device which is operated by a round-shaped handle, which is rotated. A door handle is a door opening device which is operated by a lever, which is rotated, or operated by a fixed handle.
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