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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.
 Doorknobs
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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