-L-

L-handle

n. an L-shaped handle assembly which may be lockable

 

L-handle lock

n. a cabinet lock with an L-shaped handle

 

laminated padlock

n. a padlock whose case is constructed of separate plates usually riveted together

 

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; 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

1. n. a mechanical or magnetic door fastener which can automatically keep a door, gate, etc., closed, 2. v. 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

 

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.

 

TWO LEVEL SYSTEM

LEVEL OF KEYING Level II Level I

KEY NAME master key change key

ABB. MK CK

KEY SYMBOL AA 1AA, 2AA, etc.

THREE LEVEL SYSTEM

LEVEL OF KEYING Level III Level II Level I

KEY NAME grand master key master key change key

ABB. GMK MK CK

KEY SYMBOL A AA, AB, etc. AA1, AA2, etc

 

FOUR LEVEL SYSTEM

FIVE LEVEL SYSTEM

SIX LEVEL SYSTEM

 

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 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, 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. any device which prevents access or use by requiring special knowledge or equipment

 

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

 

lockdown bar

n. an assembly which permits a laptop computer to be used, opened, closed, but not removed from a premesis, often secured by a padlock

 

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

 

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, 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. See appendix

 

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. 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 construction keying method that uses a tiny ball(s) in the pin stack to allow construction master key operation. The ball(s) may be removed from the pin stack without disassembly of the cylinder.

 

low coercivity

adj. a low energy form of magnetic encoding measuring 300 Oe which is not very resistant to accidental erasure