A bored cylindrical lock is a

lockset 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. The components of a lockset ...

which is installed by boring two circular holes in the

door A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide security b ...

Door handle 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 doors and vehicle doors. There are man ...

s may also use the same installation. Mis fotos de celular 019

Installation

Bored cylindrical lockset door preparation

Two holes are bored, perpendicular to one another, into the

. The "face bore" is the larger hole which is bored into the door face and a smaller "edge bore" hole is bored into the door edge. The edge may require additional preparation to receive the latch assembly, typically by

routing Routing is the process of selecting a path for traffic in a network or between or across multiple networks. Broadly, routing is performed in many types of networks, including circuit-switched networks, such as the public switched telephone netw ...

chisel A chisel is a tool with a characteristically shaped cutting edge (such that wood chisels have lent part of their name to a particular grind) of blade on its end, for carving or cutting a hard material such as wood, stone, or metal by hand, s ...

ing a shallow mortise. Some commercially-sold doors may come prepared to receive one or more bored cylindrical locks, such as entry doors, which typically require both a door knob and

dead bolt A dead bolt, deadbolt or dead lock is a locking mechanism distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction b ...

. In the United States, typically, the face bore is sized from in diameter and is centered at from the leading edge of the door. This distance is referred to as the "backset." Other, less popular, backsets are at . Residential doors are normally prepared with a backset and commercial doors have a backset. The edge bore is typically centered on the edge.

History

The cylindrical lock was invented by

Walter Schlage Walter Reinhold Schlage (1882–1946) was a German-born American engineer and inventor. Known as the ''Lock Wizard of Thuringia'', he is best known for the bored cylindrical lock and the lock company that bears his name, Schlage Lock Co. Early t ...

in 1923. The bored cylindrical lock arose from a need for a more cost-effective method of locking doors. The previous norm (still the norm in Europe), the mortise lock, is a more complex device, and its higher manufacturing cost as well as its more labor-intensive installation make the bored cylindrical lock an ideal substitute, both in price and functionality. Because the mortise lock has a larger lock case, a larger and more complex volume must be removed from the door before it can be installed, but the mortise lock may offer additional functions compared to a cylindrical lock; for instance, the mortise lock may include a deadbolt in a single unit, while the cylindrical lock would require separate face bores for a deadbolt and doorknob. The 1923 patent evolved from an earlier Schlage patent filed in 1920 for a lock whose installation required a face bore and surface

rabbet A rabbet (American English) or rebate (British English) is a recess or groove cut into the edge of a piece of machinable material, usually wood. When viewed in cross-section, a rabbet is two-sided and open to the edge or end of the surface in ...

, which simplified door preparation compared to a mortise lock.

Gallery

File:Electronic lock yl88.jpg File:Hamilton County Courthouse (Kansas) doorknob.JPG File:Stainless steel room door handle lock keys Oct-2011 HK Ip4.jpg

References

Locks (security device) {{tech-stub

Installation

History

Gallery

See also

References