Bored cylindrical lock

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "Bored cylindrical lock" – news · newspapers · books · scholar · JSTOR (August 2010) (Learn how and when to remove this message)

|

A bored cylindrical lock is a lockset which is installed by boring two circular holes in the door. Door handles may also use the same installation.

## Installation

[edit]

Typical preparation required for installation of a bored cylindrical lockset.

Two holes are bored, perpendicular to one another, into the door. 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 or chiseling a shallow mortise.[1] 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.

In the United States, typically, the face bore is sized from 1.5 to 2.125 inches (3.81 to 5.40 cm) in diameter and is centered at 2.375 or 2.75 inches (6.03 or 6.99 cm) from the leading edge of the door. This distance is referred to as the "backset."[2] Other, less popular, backsets are at 3.75 and 5 inches (9.5 and 12.7 cm). Residential doors are normally prepared with a 2.375-inch (6.03 cm) backset and commercial doors have a 2.75-inch (7.0 cm) backset. The edge bore is typically centered on the edge.

## History

[edit]

The modern bored cylindrical lock was invented by the German-born engineer Walter Schlage[3] in 1923,[4] as an innovation on a patent filed in 1920[5] for a lock whose installation required a face bore and surface rabbet, simplifying door preparation compared to a traditional mortise lock.

With the purpose of lowering the cost of lock installations, the cylindrical lock requires significantly less labor and materials than its predecessors. The previous standard, the mortise lock, needs a lot more wood to be removed from the door to fit its large and intricate lock body inside.

With its lower manufacturing cost and ease of installation, the cylindrical lock supplanted the mortise lock as the norm in the United States; Europe, however, did not see widespread adoption, and continues to use the mortise lock as the norm.

As a cheaper alternative, the cylindrical lock comes with fewer functions than a traditional installation; For instance, while a mortise lock can contain both a latch and deadbolt in one unit, the cylindrical lock can only have one of the two.[6] In practice, this means that a cylindrical lock is less secure than a mortise lock unless paired with a deadbolt.

## Gallery

[edit]

*   *   *

## See also

[edit]

* Mortise lock

## References

[edit]

1. ^ Gibson, Scott; Abram, Norm (30 July 2002). "How to Install a Lockset". This Old House. Retrieved 12 April 2017.
2. ^ "What is Backset". Direct Door Hardware. Retrieved 12 April 2017.
3. ^ Derdak & Grant; Thomas Derdak; Tina Grant (2006). International Directory of Company Histories, Volume 82. University of California: St. James Press. p. 330\. ISBN 1-55862-586-0.
4. ^ US granted 1674841, Schlage, Walter R., "Door Lock", issued 26 June 1928, assigned to Schlage Lock Co.
5. ^ US granted 1456041, Schlage, Walter R., "Door Lock", issued 22 May 1923, assigned to Schlage Manufacturing Company
6. ^ "Basic Technical Fundamentals of Builders Hardware: Mortise, Bored and Auxiliary Locks". Sargent, an Assa Abloy Company. 2016. Archived from the original on 7 September 2012. Retrieved 12 April 2017.

* v
* t
* e

Locks, locksmithing, lock picking, and security alarms

Fundamental concepts|

* Access control
* Authentication
* Key control
* Key duplication
* Key relevance
* Master keying
* Password
* Physical security
* Rekeying

Lock hardware|

* Bitting
* Interchangeable core
* Key blank
* Key code
* Key retainer
* Lockrod
* Lockset
* Bored cylindrical lock
* Mortise lock
* Rim lock
* Single-point locking
* Three-point locking

Keys|

* Berlin key
* Car key
* Keychain
* Skeleton key
* Smart key

Mechanical locks|

* Warded lock
* Pin tumbler lock
* Disc tumbler lock
* Lever tumbler lock
* Magnetic keyed lock
* Padlock
* Combination lock
* Rotary combination lock
* Time-delay combination locks
* Time lock
* Tubular pin tumbler lock
* Wafer tumbler lock

Electronic locks|

* Electromagnetic lock
* Electronic lock
* Electric strike
* Keycard lock

Other lock types|

* Bicycle lock
* Bramah lock
* Chubb detector lock
* Child safety lock
* Kensington Security Slot
* Latch
* Luggage lock
* Power door locks
* Protector lock
* Real-estate lock box
* Steering-wheel lock
* The Club

Lock picking|

* Lock bumping
* Locksport
* Slim Jim
* Snap gun

Door hardware|

* Dead bolt
* Door chain
* Door closer
* Door frame
* Door furniture
* Door security
* Doorknob
* Doorstop
* Hinge
* Night latch

Emergency access/exit|

* Crash bar
* Electromagnetic door holder
* Emergency exit
* Emergency light
* Exit control lock
* Exit sign
* Knox Box

Security alarms|

* Alarm device
* Alarm monitoring center
* Car alarm
* Card reader
* Closed-circuit television
* Door loop
* Dual loop
* Fingerprint scanner
* Glass break detector
* Heat detector
* Key switch
* Keypad
* Miniature snap-action switch
* Motion detector
* Occupancy sensor
* Passive infrared sensor (PIR)
* Perimeter intrusion detection
* Photoelectric sensor
* Piezo switch
* Pressure switch
* Proximity card
* Reed switch
* Tripwire
* Ultrasonic transducer
* Vandal-resistant switch
* Water detector
* Window security

Miscellaneous|

* Glossary of locksmithing terms
* John M. Mossman Lock Museum
* Key to the City
* Lock Museum
* Lock Museum of America
* Musée de la Serrure
* Puzzle lock

* Category:Locksmithing
* Keys
* Locks
* Book

*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template