Locksmith Glossary - L


Source: Lock Industry Standards and Training (LIST) Council

L Handle
(n.) An L shaped handle assembly which may be lockable.

L Handle Lock
(n.) A cabinet lock with an L shaped handle.

Labeled Door
(n.) A door which has a fire protection certification by one of the recognized underwriting agencies.

Labeled Exit
(n.) A labeled door equipped with labeled hardware that can be used for building egress.

Laminated Padlock
(n.) A padlock whose case is constructed of separate plates usually riveted together.

LAN-Alarm Web Camera
(n.) A self-standing surveillance camera having alarm compatible for IR devices, switches and onboard website, Internet email sending capability.

Large Format Interchangeable Core
(n.) An interchangeable core which is too large to fit into a small format interchangeable core housing.

Laser Cut
(adj.) 1. A way of cutting a key so that the roots of adjacent cuts are connected by a straight-line cut.
(adj.) 2. A way of cutting a key so that the root of a shallow cut is widened until it intersects the included angle of an adjacent deeper cut.

Latch
(n.) 1. A mechanical or magnetic door fastener which can automatically keep a door, gate, etc., closed.
(v.) 2. Engagement of a latch when a door, gate, etc. is pushed or pulled closed.

Latch Bolt
(n.) A spring actuated bolt, normally with one or more beveled surfaces, which, when aligned with the strike, engages it automatically.

Latch Guard
(n.) A plate or combination of interlocking pieces designed to block access to the edge of a latch when the door is shut.

Latch Tube
(n.) The encasement portion of some types of lockset that contains the latch and may also contain its operating mechanism.

Latching Speed (Of A Door Closer)
(n.) The final speed of a door just prior to closing.

Latchset
(n.) A non locking device which contains only a latch bolt, a means of operating said latch and all required trim.

Layout Tray
(n.) A compartmented container used to organize cylinder parts during keying or servicing.

Lazy Cam/Tailpiece
(n.) A cam or tailpiece designed to remain stationary while the cylinder plug is partially rotated and/or vice-versa.

Leading Face
(n.) The door face closest to the strike side of the jamb when the door is open.

Leaf
(n.) 1. One half or section of a hinge.
(n.) 2. One door in a set of double doors.
(n) 3. One section of a multiple section door.

Left Hand (Man Door)
(adj.) Pertaining to an inward swinging door with hinges on the left side, using the outside of the door as reference.

Left Hand Reverse Bevel (Door)
(adj.) Pertaining to a left handed door which swings outward.

Leg Irons
(n. pl.) A pair of ringlike fetters, connected by a short chain or straight member, designed to be locked about the ankle.

Levels Of Keying
(n. pl.) The divisions of a master key system into hierarchies of access, as shown in the following tables. Note: the standard key coding system has been expanded to include key symbols for systems of more than four levels of keying.

Lever (Combination Lock)
(n.) Part of a combination lock that engages the drive cam, when the proper combination is supplied, and is directly attached to the locking bolt.

Lever Handle
(n.) A turn device in the general shape of an "L" used on certain locks and latches, as an alternate to a knob for ease of use.

Lever Lock
(n.) A lock whose tumblers are levers that must be raised to a given position so that the bolt can move.

Source: Dictionary.com

Lever Nose
(n.) The hooked portion of a lever that engages the drive cam in a combination lock.

Lever Pack
(n.) A set of lever tumblers.

Lever Rig
(n.) Any device which utilizes a fulcrum with a long bar or pole as a means to apply pressure while drilling.

Lever Tumbler
(n.) A flat, spring-loaded tumbler which usually pivots on a post. It contains a gate which must be aligned with a fence to allow movement of the bolt.

LFIC
(abb.) Large Format Interchangeable Core

LH
(abb.) Left Hand

LHR
(abb.) Left Hand Reverse Bevel

LHVD
(abb.) Left Hand Vertical Down

LHVU
(abb.) Left Hand Vertical Up

Lift Arc
(n.) The distance a lever tumbler may be raised by a key from its at-rest position.

Linkage
(n.) 1. Any of various parts in a lock that help transfer motion to the bolt of a lock from a cylinder, turnpiece or other actuator not mounted to or touching the bolt/lock case.
(n.) 2. Part of the interconnected boltworks of an automotive lock.

Lip (Of A Strike)
(n.) The extended (usually curved) leading edge of a strike.

Loading Tool
(n.) A tool which aids installation of cylinder components into the cylinder shell.

LOBC
(abb.) 1. Locked On By Combination
2. (sic) Locked On Back Cover

LOBC Index
(n.) The index to which a combination is dialed in order to remove the lock's cover.

Lock
(n.) A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or securing.

Source: Dictionary.com

(n.) Any device which prevents access or use by requiring special knowledge or equipment.

Source: Lock Industry Standards and Training (LIST) Council

Lock Service Package
(n.) A kit offered by the manufacturer or distributor of a product, which contains what he deems required to properly service the product.

Lock Stile
(n.) The vertical edge of a door designed for lock or latch installation.

Lock Window
(n.) An opening in the case of a lever tumbler lock for viewing the fence entering the gates of the levers.

Lock-In
(adj.) Of or pertaining to a combination lock that is inoperable because the last number of a combination is set in the forbidden zone.

Lockdown Bar
(n.) An assembly which permits a laptop computer to be used, opened, closed, but not removed from a premises, often secured by a padlock.

Locked Closed
(adj.) Of or pertaining to a condition wherein the bolt(s) are engaged and the lock(s) are restricting access.

Locked On By Combination
(n.) A combination lock cover that can only be removed in conjunction with dialing the combination or while the lock bolt is in motion.

Locked Open
(adj.) Of or pertaining to a condition wherein the bolt(s) are engaged and lock(s) are not restricting access.

Locked, Locking, Locks
(v. tr.) 1. To fasten the lock of: close and lock a drawer.
(v. tr.) 2. To shut or make secure with or as if with locks: locked the house.

Source: Dictionary.com Locker Lock
(n.) 1. Any of various types of locks designed for a specific mounting preparation commonly used on lockers as well as other applications.
(n.) 2. Any of various locks used to lock lockers.

Locking Lug
(n.) A fixed component of a safe which locks the safe door in place in the locked position.

Locking Lug Nut
(n.) A lug nut which requires the use of a key or special wrench.

Lockout
(n.) Any situation in which the normal operation of a lock or cylinder is prevented.

Lockout Key
(n.) A key made in two pieces. One piece is trapped in the keyway by the tumblers when inserted and blocks entry of any regular key. The second piece is used to remove the first piece.

Lockset
(n.) A locking device, complete with trim, mounting hardware and strike.

Locksmith
(n.) Someone who makes or repairs locks.

Source: Dictionary.com

(n.) A person with the knowledge and ability to select, install, service and bypass all the components of an electrical or mechanical lock.

LoCo
(abb.) Low Coercivity

Lost Ball Keying
(n.) A keying method that uses a tiny ball(s) in the pin stack. The ball(s) may be removed from the pin stack without disassembly of the cylinder. Typically used for construction keying.

Low Coercivity
(adj.) A low energy form of magnetic encoding measuring 300 Oe which is not very resistant to accidental erasure.

Lug Door
(n.) A usually rotatable safe door which has projections that interlock with the safe body to retain the door.

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