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LOCKSMITH DICTIONARY
- D -
- day
gate
- n. a barrier used
to restrict passage during normal business hours,
normally used at a vault entrance
-
- day key
- n. 1. the key for a
day gate or day operation of a safe or vault lock 2. a
cash register key which does not allow audit or reset
functions 3. see 'change key'
-
- daylock
- 1. n. a locking device,
other than the primary lock, used to maintain the safe in a
locked condition, 2. v. to insecurely close a safe or vault
door without scrambling the combination, even though the
door may not be opened by simply turning or pulling the handle
-
- dead pin
- n. an immovable pin in
a tubular lock which functions as a ward
-
- deadbolt
- n. a bolt, which
requires a deliberate action to extend, and which resists
end pressure in the unlocking direction when fully
extended
-
- deadlock
- n. a lock which
incorporates a deadbolt
-
- deadlocking
- adj. pertaining to
any feature which, when fully engaged, resists attempts
to move the latch or bolt in the unlocking direction
through direct pressure
-
- deadlocking
latch
- n. a latchbolt with
a deadlocking mechanism
-
- declining step key
- n. a key whose cuts are equal or deeper as you proceed from bow to tip
-
- deco key finish
- n. any design embossed or imprinted on a key
to give it an aesthetic appearance
-
- decode
- v. to determine a
key combination by physical measurement of a key and/or
cylinder parts
-
- decoder
gauge
- n. a measuring
device which helps determine the combination of a lock or
cylinder without removing the tumblers
-
-
deflector cover
- n. a removable shield
designed to prevent pin point drilling on a safe
-
- degree
of rotation
- n. a specification
for the angle at which a cut is made into a key blade as
referenced from the perpendicular; e.g., right (R or 2),
left (L or 1) or center (= perpendicular) (C). This
specification is typically used for some high security
keys.
-
- delamination
- v. the process on older laminated door safes of having to remove some
layers of the lamination to allow access to the lock
-
- delayed action timer
- n. a secondary device which prevents movement of a bolt or boltworks
until a set amount of time has elapsed. The device is normally set or
activated as part of the unlocking process.
-
- delayed egress
- n. an exit that will not open until a preset amount of time
after actuation has elapsed
-
- department
master key
- n. a master key
which operates all or most master keyed locks of a given
department
-
- depth
key set
- n. a set of keys
used to make a code original key on a key duplicating
machine to a lock manufacturer's given set of key bitting
specifications. Each key is cut with the correct spacing
to one depth only in all bitting positions, with one key
for each depth.
-
- derived
series
- n. a series of
blind codes and bittings which are directly related to
those of another bitting list
-
- detector
lever
- n. a lever tumbler with
an extra gate that, when elevated beyond the
bolt fence, accepts a latching fence to prevent further movement of the
tumbler
-
- detector
lock
- n. a lock that
incorporates a detector lever in its mechanism
-
- detention lock
- n. a lock
designed for securing a cell or other area in a prison or jail
-
- DHI
- abb. Door and
Hardware Institute
-
- dial
- 1. n. the typically rotatable member of a
combination lock that may be used to differentiate locations
on the combination wheels and cause operation of the lock, 2.
v. the act of turning or rotating a dial
-
- dial insert lock
- n. a key operated cylinder
used to lock the dial on a combination lock
-
- dial ring
- n. an escutcheon for a combination lock dial
-
- dialer
- n. 1. a device,
which automatically places a telephone call to a pre-set
number when, activated 2. an electro-mechanical device
which systematically tries different combinations on a
dial operated combination lock
-
- diamond
back
- adj. pertaining to
a rim cabinet lock whose mounting flanges and case forms
the general shape of a diamond
-
- diamond
pick
- n. a
tumbler manipulation device with a triangular protrusion
at its tip
-
- digital dial
- n. a rotatable dial that causes a separate readable index, (typically
digital), to change
-
- digital dialer
- n. a telephone communication device that
dials a programmed telephone number, and transmits, via
tones or pulses, one or more signals to a digital
receiver
-
- dimple
- n. a key cut in a
dimple key
-
- dimple
key
- n. a key whose cuts
are drilled or milled into its blade surfaces. The cuts
normally do not change the blade silhouette.
-
- direct
code
- n. a designation
assigned to a particular key which includes the actual
combination of the key
-
- direct drive
- adj. of or pertaining to a combination lock with the drive cam mounted
on the dial's spindle shaft
-
- direction of rotation
- n. the
direction a combination lock dial is to be turned when
the combination is worked. It usually is specified as
clockwise (CW) or right (R), or counter clockwise (CCW)
or left (L).
-
- disc
tumbler
- n. 1. a flat
tumbler which must be drawn into the cylinder plug by the
proper key so that none of its extremities extends into
the shell 2. a flat, usually rectangular tumbler with a
gate which must be aligned with a sidebar by the proper
key
-
- diskette lock
- n. a usually key
operated device which blocks access to the drive for a
removable disk
-
- display
key
- n. a special change
key in a hotel master key system which will allow access
to one designated guest room, even if the lock is in the
shut out mode. It may also act as a shut out key for that
room.
-
- divided plug keyway
- n. a cylinder plug divided at the keyway into two parts. Either part may
be replaced to result in a different keyway combination via different
warding for the keyway
-
- dog
- 1. v. to place an
exit device in the holdback mode 2. n. in marine
applications the latch for a hatch
-
- dogging
cylinder
- n. a key operated
cylinder used to dog an exit device
-
- dogging device
- n. in an exit device,
a mechanism used to temporarily disable the latch from locking
-
- dogging
key
- n. a key or tool
used to dog an exit device
-
- dogging
screw
- n. a screw used to
dog an exit device
-
- door bumper
- n. an obstruction
installed to prevent a door or lock from contacting another object
-
- door closer
- n. a device
designed to regulate the closing of a door automatically by
various means
-
- door
control
- n. any device which
controls the opening, closing or position of a door
-
- door holder
- n. any device designed to maintain a door in the open position
-
- door lug
- n. a non-movable projection on a safe door that helps keep the door in
the locked position
-
- door puller
- n. a tool
designed to open a safe deposit box by forcibly pulling
the door and breaking the lock
-
- door
silencer
- n. a bumper
installed in the jamb stop to quiet the closing of a door
-
- door swing
- adj. the direction and degree to
which a door opens, as LH 90º, RH 180º, etc.
-
- door viewer
- n. a device
with one or more lenses, mounted in a door at eye level,
which allows a limited view through a door
-
- double-acting closer
- n. a door closer
designed to be used on a double-acting door
-
- double-
acting door
- adj. a door that
may be pushed open from either side
-
- double-acting hinge
- n. a hinge which
permits movement of a door in either direction from the
closed position
-
- double-acting
lever tumbler
- n. one that must be
lifted a precise amount, neither too little nor too much
to allow movement of a bolt
-
- double bitted key
- n. a key typically
bitted on two opposite surfaces
-
- double cut
- 1. n. two bittings
for the same tumbler position 2. adj. see "double bitted key"
-
- double
cylinder
- adj. pertaining to
a lock with two keyed cylinders
-
- double
cylinder deadlock
- n. a deadbolt lock
whose bolt may be operated by a key from either side
-
- double-D
- n . a shape
consisting of two opposing arcs and two opposing flats
adj. 2. Having such a shape.
-
- double-D
punch
- n. a tool used to
make a double-D hole
-
- double horn
- adj. of or pertaining to a safe deposit
type lock which requires two separate holes through the
door
-
- double locking
- adj. of or pertaining to a lock with one or more bolts
with different functions, typically a latch and a deadbolt
-
- double
pin
- v. o place more
than one master pin in a single pin chamber
-
- double throw bolt
- n. a deadbolt that
has two distinct extended positions, both of which are
deadlocked
-
- drawback
latch/lock
- n. a latch/lock whose
latch is disengaged by pushing or pulling an actuator toward
the hinge side of the jamb
-
- draw sheet
- n. a page with a completed matrix of potential combinations
used in Matrix Format Master Keying
-
- drill point
- n. the exact measurement of the location used to drill a
locked up container to effect an opening
-
- drive cam
- n. the first
wheel rotated by a dial or key that has an opening designed
to allow the fence, lever, or tailbar to enter and facilitate
in opening of the lock or safe
-
- drive-in
- adj. pertaining to
a latch or bolt with a round face
-
- driver
spring
- n. a spring placed
on top of the pin stack to exert pressure on the pin
tumblers
-
- drop
- n. a pivoting or
swinging dust cover, see also "increment"
-
- drop
bolt
- n. a lock with an
interlocking bolt which moves vertically and may enter
loops on the strike
-
- drop in
- n. the gate area
of the drive cam where the lever nose drops into. Usually
identified with a corresponding number on the dial
-
- drop-in
point
- n. the location in a
combination lock where the wheel gates are aligned with
the fence
-
- drop ring
- n. a looped handle which can pivot, typically recessed and
falls flush with the door face when not in use
-
- dual
custody
- n. 1. a function
designed to require the presence of two persons with two
different keys, combinations or codes to operate the same
device 2. adj. Pertaining to such a function
-
- dual locking cylinder
- n. a style
of lock cylinder whose key operates two independent locking
mechanisms within the cylinder
-
- dumbbell pin
- n. a spool pin with serrations at the larger diameter
ends
-
- dumb card
- n. an authorization credential that presents recorded data only
-
- dumb reader
- n. an access control
interrogation device that can only relay data to a
controller
-
- dummy
- adj. pertaining to any type of non-active
device applied for aesthetic purposes
-
- dummy
cylinder
- n. a non-functional
facsimile of a rim or mortise cylinder used for
appearance only, usually to conceal a cylinder hole
-
- dummy
trim
- n. non-active trim
applied for aesthetic purposes
-
- duplex
- n. an early trade name used by Yale for
locks which offer the functionality of master keying by
incorporating two cylinders on the same side of the door,
or two keyways in a lever tumbler lock. One keyway is for
the change key and the other keyway is for the 'master
key'.
-
- duplicate
- v. to copy, see
also "duplicate key"
-
- duplicate
key
- n. any key
reproduced from a pattern key
-
- duress
code
- n. a special
combination or operation sequence which conveys an alarm
or other signal to a remote location while allowing
access
-
- dust
box
- n. an enclosure
applied under a strike to enhance appearance and/or
performance
-
- dust
cover
- n. a device
designed to prevent foreign matter from entering a
mechanism through the keyway
-
- dustproof
cylinder
- n. a cylinder
designed to prevent foreign matter from entering either
end of the keyway
-
- dust
proof strike
- n. a typically
floor mounted strike that has a spring loaded internal
plunger designed to keep the receptacle free of dust and debris
-
- Dutch door bolt
- n. a bolt which
secures the top section of a Dutch door to the bottom
section
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