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This is an accepted version of this page This is the latest accepted revision, reviewed on 5 February 2025. 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 ...
The latch bolt is disengaged (retracted) typically when the user turns the door handle, which via the lockset's mechanism, manually retracts the latch bolt, allowing the door to open. A deadlocking latch bolt (deadlatch) is an elaboration on the latch bolt which includes a guardbolt to prevent "shimming" or "jimmying" of the latch bolt. When ...
A brass catcher (also brass trap) is a device designed to capture cartridge casings, often made of brass, as they are ejected from a firearm. Various designs exist, utilizing a bag, pouch, net, or box to catch the casings. Some brass catchers, whether universal or designed for a specific gun, can be attached directly to the firearm.
The energy used in opening the door is stored in a spring (compression, torsion, tension, volute or leaf), [25] and released to close the door. Spring tension is typically adjustable, altering both opening and closing force. Most door closers use oil-filled hydraulic dampers to limit closing speed, and allow for soft closing. Other types use a ...
The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge). A steel plate, often mounted on a ball joint or swivel joint, is attached to the door so that it can contact the electromagnet when the door is fully opened. An electric current ...
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