1STChoice Locksmith

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  (312) 572-9320

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DOOR KNOB LOCKS

The location of the door handle on the door may vary between a few centimeters away from the edge of the door to the exact center of the door, depending on local culture, decorative style or owner preference. The distance from the edge of the door to the center of the handle is called the backset.
Chicago Door Knob InstallerDoorknobs in particular can be difficult for the young and elderly to operate, if a person lacks a firm grip. For this reason door handles in most commercial and industrial buildings and in many households use a lever, rather than a doorknob, as the lever does not require as tight a grip. Levers are also beneficial on doors with narrow stile widths where the reduced backset leaves insufficient space to comfortably turn a doorknob.

Most household door handles use a simple mechanism with a screw-style axle (called a spindle) that has at least one flat side, which is passed through the door latch, leaving some length exposed on each side of the door to which the handles are attached. Some handles are attached on both sides by screwing or sliding them directly onto the spindle, and then securing one or more retaining screws (set screws) through the knob perpendicular to the flat of the spindle. Handles that lose traction can frequently be repaired by replacing or adjusting the set screw, which prevents them from slipping on the spindle. Other types of handles, typically used in Europe, slide onto the spindle but are affixed only to the door itself without use of set screws.

Household Handles:

  • Entrance: These door handles are typically used on exterior doors, and include keyed cylinders.
  • Privacy: Typically used on bedrooms and bathrooms; while they are lockable (un-lockable with a generic tool), they do not have keyed cylinders.
  • Passage: Also known as hall or closet, these do not lock and are used in hall or closet doors.
  • Dummy: These types are used for ball catch doors or other applications where a latch mechanism is not needed, but a similar aesthetic effect is desired.

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DOOR KNOB LOCKS
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