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Right hand hinge (RHH): Standing outside (or on the less secure side), the hinges are on the right and the door opens in (away from you). Left hand reverse (LHR): Standing outside the house (or on the less secure side), the hinges are on the left, knob on right, on opening the door it swings toward you (i.e. the door swings open toward the ...
When standing outside, a left-handed door opens from left to right (when closed, the handle is on the far left), and a right-handed door opens from right to left (when closed, the handle is on the far right). These relationships are sometimes described with the letters O and X, where O is the fixed panel and X is the sliding panel.
By common convention, right-handedness is the default handedness for screw threads. Therefore, most threaded parts and fasteners have right-handed threads. Left-handed thread applications include: Where the rotation of a shaft would cause a conventional right-handed nut to loosen rather than to tighten due to applied torque or to fretting ...
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This is an accepted version of this page This is the latest accepted revision, reviewed on 6 March 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 ...
Numerous devices exist to serve specific purposes related to how a door should (or should not) be used. See: Door chain - A device to secure door opening; Door closer – Mechanical or electromagnetic device to close an open door (in the event of a fire) [3] Door opener - Automatic door opening device activated by motion sensors or pressure pads
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 ...
Metal fire-resistance rated door with a lockset consisting of a locking latch bolt operated by lever handle with an escutcheon that encompasses the locking mechanism.. A lockset (alternatively lock set) is the hardware and components that make up the locking or latching mechanism that can usually be found on a door or other hinged object but can also include sliding doors and dividers. [1]