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A
Active Door (in a pair of doors)—the
leaf that opens first and the one to which the lock is applied.
AHC—indicates that the individual so
identified is a qualified Architectural Hardware Consultant and member
of the Door and Hardware Institute.
Anti-Friction bearing—any bearing
having the capability of effectively reducing friction.
Anti-Friction Latch Bolt—A latch
bolt designed to reduce friction when the bolt starts to engage the lock
strike.
Architectural Hardware—Term applied
to all hardware used in building construction but particularly that used
on or in connection with doors, windows, cabinets and other movable
members.
Armored Front—A lock that consists
of two plates: the under plate is fastened to the case and is
unfinished; the finish plate is fastened to the under plate and when in
place covers the cylinder set screws, thus protecting them from
tampering. Used on mortise locks.
Armor Plate—A plate similar to a
kick plate but covering the door to a greater height, usually 40"
(1040mm) or more from the bottom.
Astragal—A molding or strip whose
purpose is to cover or close the gap between the edges of a pair of
doors. Some types overlap, others meet at the center line of the gap.
(See Coordinator)
Auxiliary Dead Latch —A
supplementary latch that automatically deadlocks the main latch bolt
when the door is closed. (Also called Deadlocking Latch Bolt)
B
Back Check—Optional feature in
hydraulic door closers slowing the opening swing of the door somewhere
between 60 degrees and 85degrees of opening. Designed to protect an
object behind the door. Not intended to act as an overhead stop.
Backset (of a lock)—The
horizontal distance from the face of the lock to the center line of knob
hub keyhole or cylinder. (Measured from the high side of a beveled
door.)
Backset (of a hinge)—The
distance from the edge of the door to the hinge.
Ball-Bearing Hinge —A hinge equipped
with ball bearings between the hinge knuckles to reduce friction.
(See Anti-Friction Bearing)
Bevel (of a door)—The angle
of the lock edge in relation to the face of the lock stile. Standard
bevel is 1/8" in 2" (3.2mm in 50.8mm). If otherwise detailed, it must be
so noted in ordering locks.
Bevel (of a lock)—A term used
to indicate the direction in which the latch bolt is inclined: regular
bevel for doors opening in, reverse bevel for doors opening out.
Bevel (of a lock front)—The
angle of a lock front when not at right angle to the lock case, allowing
the front to be applied flush with the edge of a beveled door.
Bit (of a key)—The projecting
blade, cut in a manner that actuates the tumblers and permits the lock
bolts to be operated.
Bored Lock (or Latch)—Lock or
latch whose parts are intended for installation in holes bored in a
door.
Box Strike—A strike that also
provides a complete housing to protect the bolt openings.
Builders' Hardware—See Architectural
Hardware
Butt (Hinge)—A type of hinge
designed for mortising into the edge of the door and into the rabbet of
a door frame.
C
Cam (of a cylinder)—A
rotating piece attached to the end of the cylinder plug to engage the
locking mechanism.
Cane Bolt—A heavy cane-shaped bolt
with the top bent at right angles; used on the bottom of doors.
Case (of a lock)—The box
containing the lock mechanism.
Casement Hinge—A hinge to swing a
casement window. The term is often used to describe a hinge designed to
throw the sash out far enough to permit cleaning the outside of the
glass from the inside of the room on an outward-swinging casement.
CDC—Indicates that the individual so
identified is a Certified Door Consultant and member of the Door and
Hardware Institute.
Chain Bolt—A spring bolt actuated by
a chain attached to the spring bolt for application at the top of the
door.
Chain Door Fastener—A device that
limits the opening of a door by means of a chain.
Changes (Key)—The different
bittings or tumbler arrangements in a series of locks.
Checking Floor Hinge—A device placed
in the floor that combines top and bottom pivots for hanging the door
with a controlled speed closing mechanism.
Continuous Hinge (also called
Piano Hinge)—A hinge designed to be the same length as the moving
part to which it is applied, for example, the lid covering the keyboard
of a piano.
Coordinator—A device used on a pair
of doors to ensure that the inactive leaf is permitted to close before
the active leaf. Necessary when an overlapping astragal is present and
exit devices, automatic or self-latching bolts are used with closers on
both door leaves.
Cremone Bolt—A device of surface
application that, by a turn of knob or lever handle, locks the door or
sash into the frame, top and bottom.
Cup Escutcheon—A door plate, for use
on sliding doors, having a recessed panel to afford finger hold and to
contain a flush ring and sometimes a cylinder, all being flush with the
surface of the plate.
Cylinder (of a lock)—The
cylindrical-shaped assembly containing the tumbler mechanism and the
keyway, which can be actuated only by the correct keys.
Cylinder Collar—A plate or ring used
under the head of a cylinder.
Cylinder Lock—A lock in which the
locking mechanism is controlled by a cylinder.
Cylindrical (locks and latches)—A
term used to describe bored locks, which have a cylindrical case into
which a separate latch bolt case fits.
Cylinder Screw—The set screw that
holds a cylinder in place by preventing the cylinder from being turned
after installation.
D
Deadbolt (of a lock)—A lock
bolt having no spring action nor bevel, and which is operated by a key
or a turn piece.
Deadlock—A lock equipped with a
deadbolt only.
Deadlocking Latch Bolt—A latch bolt
incorporating a plunger that is held in a retracted position when a door
is closed, thus preventing the bolt from being retracted by end
pressure.
Dogging Device—As used in exit
devices, a mechanism that fastens the cross bar in the fully depressed
position and retains the latch bolt or bolts in a retracted position,
thus permitting free operation of the door from either side.
Door Bolt—A manually operated rod or
bar attached to a door providing means of locking.
Door Closer Bracket—A device whereby
a door closer may be installed on the frame rather than directly on the
door.
Door Closer or Check—A device
combining a spring for closing and a compression chamber into which the
liquid or air escapes slowly, thus providing a means of controlling the
speed of the closing action.
Door Holder—A device that holds a
door open at one or more selected positions.
Door Pivot—A hinging device
embodying a fixed pin and a single joint. Most types include lateral
fastening.
Door Stop—A device to stop the swing
or movement of a door at a certain point. Also an architectural term
defining that part of a door frame against which the door closes.
Double-Throw Bolt—A bolt that can be
projected beyond its first position into a second, or fully extended
one, thus providing extra security.
Drawer Roller—A device used to ease
the sliding of a drawer open or shut, usually with a metal or fiber
wheel rotating in a metal frame.
Drawer Slides—A mechanism employing
guides and rollers that guide and support the drawer, permitting easy
operation.
Drivers—The upper set of pins in a
pin tumbler cylinder which, when activated by the springs, project into
the plug until raised by insertion of the key.
Drop Escutcheon (or Key Plate)—One
having a pivoted plate that covers the keyhole.
Drop Ring—A ring handle attached to
a spindle that operates a lock or latch. The ring is pivoted but remains
in a dropped position when not in use.
Dummy Cylinder—A mock cylinder
without any operating mechanism for use where effect is desired.
Dummy Trim—Trim only, without lock;
usually used on the inactive door in a pair of doors.
Dust-Proof Strike—A strike with a
spring plunger that completely fills the bolt hole when the bolt is not
projected.
Dutch Door Bolt—Device for locking
together the upper and the lower leaves of a Dutch door.
E
Edge Plate—An angle or
channel-shaped guard used to protect the edge of a door.
Edge Pull—A pull mortised into the
edge of a sliding door.
Elbow Catch—A spring-loaded device
embodying a rocker arm and angle strike, for locking the inactive leaf
of a pair of cabinet locks.
Electric Strike—An electrical device
that permits releasing of the door from a remote control.
Escutcheon (Elongated)—A
plate long enough to span a lock case and having holes for knob bushing,
bit key, cylinder, turn knob and similar operating members as required.
Escutcheon (Key)—See Key
Plate
Exit Device—A door-locking device
designed to grant instant exit by pressing on a cross bar that releases
the locking bolt or latch.
Extension Flush Bolt—A flush bolt in
which the connection between bolt head and operating mechanism is by
means of a rod inserted through a hole bored in the thickness of the
door.
Extension Link—A device used to
provide long backsets in bored locks.
F
Face (of a lock)—The exposed
surface that shows in the edge of a door after installation.
(See Front)
Fast Pin Hinge—One in which the pin
is fastened permanently in place.
Finish Builders' Hardware—Hardware
that has a finished appearance as well as a functional purpose and that
may be considered a part of the decorative treatment of a room or
building. Also termed Architectural Hardware, Finish Hardware and
Builders' Hardware.
Fire Exit Bolt—See Exit Device
Floor Closer—A closing device
installed in the floor under a door.
Floor Hinge—A combined pivot hinge
and closing device set either in the floor or in the bottom of the door.
It may be spring type only or may be combined with liquid control.
Flush Bolt—A door bolt so designed
that when applied it is flush with the face or edge of the door.
Flush Cup Pull—A pull mortised flush
into a door, having a ring pull that folds flat into the cup of the
pull.
Flush Ring—A flush door pull
mortised in a door, having a ring pull that folds flat into the cup of
the pull.
Foot Bolt—A type of bolt applied at
the bottom of a door and arranged for foot operation. Generally the bolt
head is held up by a spring when the door is unbolted.
Friction Catch—Any catch which when
it engages a strike is held in the engaged position by friction.
Friction Hinge—A hinge designed to
hang a door and hold it at any desired degree of opening by means of
friction control incorporated in the knuckle of the hinge.
Front (of a lock)—The plate
through which the latching or locking bolts project.
(See Face.)
G
Grand Master Key—A key that operates
locks in several groups, each of which has its own master key.
Guard Bar—A series of two or more
cross bars generally fastened to a common back plate to insure
protection of glass or screen in a door.
H
Hand (of a lock, etc.)—Indicates
the direction of swing or movement, and/or locking security side of a
door.
Handed (locks, etc.)—Indicates
that the article is for use only on doors of the designated hand.
Harmon Hinge—A hinge designed to
swing a door into a pocket at a right angle with the frame.
Hasp—A fastening device consisting
of a loop and a slotted hinge plate, normally secured with a padlock.
Hinge—Two plates joined together by
a pin and attached to a door and its frame whereby a door is supported
and is enabled to swing or move.
Hinge Stile (of a door)—The
stile to which the hinges are applied as distinguished from the lock
stile.
Horizontal Spring Hinge—A spring
hinge mortised horizontally into the bottom rail of a door and fastened
to the floor and head frame with pivots.
Hub—The part of a lock through which
the spindle passes to actuate the mechanism.
I
Inactive Door (or leaf)—That
leaf of a pair of doors that does not contain a lock, but is bolted when
closed, and to which the strike is fastened to receive the latch or bolt
of the active door.
Indicator Button—A device used in connection with a hotel lock to
indicate whether or not the room is occupied.
Integral (locks and latches)—A term used to describe a type of mortise
lock having a cylinder in the knob.
Invisible Hinge—A hinge so constructed that no parts are exposed when
the door is closed.
K
Keeper—Synonymous with Strike.
Key Change—The combination of cuts in a key that enable it to operate
the lock for which intended.
Key Plate—A small plate or escutcheon having only a keyhold.
Keyway—The aperture in lock cylinders that receives the key and closely
engages with it throughout its length.
Kick Plate—A protective plate applied on the lower rail of the door to
prevent the door from being marred.
Knob—A projecting handle for operating a lock.
Knob Shank—The projecting stem of a knob into which the spindle is
fastened.
Knob Top—That part of the knob that the hand grasps.
Knuckle—The enlarged part of a hinge into which the pin is inserted.
L
Latch Bolt—A beveled spring bolt, usually operated by a knob, handle or
turn.
Leaf (of a pair of doors)—One of the two doors forming a pair of doors.
Letterbox Back Plate—A plate, similar to a letterbox plate, attached to
the inside of a door to allow the passage of mail.
Letterbox Plate—A plate attached to the door with an opening to permit
insertion of mail.
Lever Handle—A horizontal handle for operating the bolt(s) of a lock.
Lever Tumbler—Flat tumbler having a pivoted motion actuated by the
turning of the key and controlling the locking function.
Lip of a Strike—The projecting part on which the latch bolt rides.
Lock Rail (of the door)—The horizontal member of a door intended to
receive the lock case.
Lock Set—A lock, complete with trim, such as knobs, escutcheons or
handles.
Lock Stile (of a door)—The stile to which the lock is applied as
distinguished from the hinge stile.
Loose Joint Hinge—A hinge having but two knuckles; the pin is fastened
permanently to one knuckle, the other contains the pinhole, whereby the
two parts of the hinge can be disengaged by lifting. These hinges are
handed.
Loose Pin Hinge—A hinge having a removable pin to permit the two parts
of the hinge to be separated.
M
Magnetic Catch—A cupboard catch that uses a magnet to hold the door
closed.
Master Key—Operates any quantity of cylinders of different individual
key changes.
Master keying—An arrangement of cylinders having individual key changes,
which permits them all to be operated by a simple key called a master
key.
Mono Lock—See Preassembled Lock
Mop Plate—A narrow plate similar to a kick plate, of sufficient height
to protect against the swish of the mop.
Mortise—A cavity made to receive a lock or other hardware; also the act
of making such a cavity.
Mortise Bolt—A door bolt designed to be mortised into a door rather than
applied to its surface.
Mortise Lock (or Latch)—A lock designed to be installed in a mortise
rather than applied to the door's surface.
Mullion—A fixed or movable post dividing an opening vertically.
N
Night latch—An auxiliary lock having a spring latch bolt and functioning
independently of, and providing additional security to, the regular lock
of the door.
O
Olive Knuckle Hinge—A paumelle hinge with knuckles forming an oval
shape.
Overhead Concealed Closer—A closer concealed in the head frame with an
arm connecting with the door at the top rail.
P
Panic Exit Device—See Exit Device
Para centric—A term used in connection with cylinder plugs having
projections on the sides of the keyway that extend beyond the vertical
center line of the keyway.
Paumelle—A style of hinge embodying a single joint of the pivot type,
generally of modern, or streamlined design.
Pin Tumblers—Small sliding pins in a lock cylinder, working against coil
springs and preventing the cylinder plug from rotating until the pins
are raised to the proper alignment by bitting of key.
Pivot—See Door Pivot
Plug (of a cylinder)—The round part containing the keyway and rotated by
the key to transmit motion to the bolt(s).
Preassembled Lock—A lock that has all parts assembled as a unit at the
factory and which, when installed in a rectangular notch cut into the
door edge, requires little or no disassembly.
Prison Lock—A heavy lock designed especially for use on jail cells.
Push Plate—A plate applied to the lock stile to protect the door against
soiling and wear.
Q
Quadrant (Dutch Door)—A device for fastening the upper and the lower
leaves of a Dutch door.
R
Rabbet—A term used to describe the abutting edges of a pair of doors or
windows so shaped as to provide a tight fit. One half of the edge
projects beyond the other half, usually 1/2". Also used to define that
portion of a door frame into which the door fits.
Rabbeted Lock (or Latch)—A lock in which the face conforms to the rabbet
found on a rabbeted door.
Rail (of a door)—A horizontal member that joins the stiles. May be
exposed as in a paneled door, or concealed as in a flush door.
Reinforcing Unit—A metal, box-shaped reinforcement used in a metal door
in which a bored lock is to be installed to provide both vertical and
horizontal latch support.
Reverse Bevel—See Bevel
Reversible Lock—A lock which, by reversing the latch bolt, can be used
by either hand. On certain types of locks, other parts must also be
changed.
Rigid Lock—See Preassembled Lock
Rim—A term indicating articles of hardware designed for application to
the surface of doors and windows.
Roller Latch—A friction door latch employing a roller latch head under
spring tension, which engages a strike having a recess formed to receive
the roller.
Roller Strike—A strike having a rolling member at the point of latch
bolt contact to minimize friction.
Rose—A trim plate attached to the door under the knob. It sometimes acts
as a knob bearing.
Rounded Front—A lock or bolt front conforming to the rounded edge of a
double-acting door. The standard radius is 4" (101.6mm).
S
Sash Balance—A spring device used to counterbalance the weight of a
window sash or other vertical sliding part.
Sash Center—A pivoted support for transom or sash and comprised of two
parts, one of which contains a pivot, the other a socket for the pivot.
Sash Chain—A metal chain adapted for use with a sliding sash, attached
to the sash and to the counterbalancing sash weight.
Sash Cord—Cord or rope used similarly to sash chain and in place of
chain.
Sash Cord Iron—A small metal holder inserted in the edge of the sash, to
which sash cord or sash chain is attached.
Sash Fast—A fastener attached to the meeting rail of double-hung
windows.
Sash Lock—A sash fast with a locking device controlled by a key.
Sash Pole—A wood or metal pole to which a sash pole hook is attached.
Sash Pole Hook—A metal hook attached to a wooden or metal pole used to
lower or raise a transom or sash beyond hand reach.
Sash Pulley—A pulley mortised into the frame of a double-hung sash frame
over which the sash cord or sash chain passes.
Sash Socket—A metal plate containing a hole or cup to receive a sash
pole hook.
Sash Weight—A weight used to balance sliding sash, usually of cast iron
or, if conditions require, of lead.
Screen Door Latch—A small locking or latching device used on screen
doors and operated by a knob or a lever handle.
Screwless Knob—A knob attached to a spindle by means of a special wrench
as distinguished from the more commonly used side knob screw.
Screwless Rose—A rose with concealed method of attachment.
Secret Gate Latch—A surface-applied latch operated by a concealed button
or other device; usually used on office gates.
Shank (of a knob)—The projecting stem of a knob into which the spindle
is fastened.
Shelf Pin—A pin for supporting a shelf; also called a shelf support or
shelf rest.
Shutter Operator (also called a Shutter Worker)—A device incorporating a
hinge and a method of opening or closing a shutter by means of a crank
or turn from inside without opening window.
Side Knob Screw—A set screw used to fasten a knob to a spindle.
Signal Sash Fastener—A sash-fastening device to lock double-hung windows
that are beyond reach from the floor. It has a ring for a sash pole
hook. When locked, the ring lever is down; when the ring lever is up, it
signals by its upright position that the window is unlocked.
Spindle (of a knob)—The bar or tube connected with the knob or lever
handle that passes through the hub of the lock or otherwise engages the
mechanism to transmit the knob action to the bolt(s).
Split Astragal—An astragal that is split through the middle, allowing
each door leaf to operate independently.
Spring Hinge—A hinge containing one or more springs to move the door
into the desired position. It may be either single or double acting.
Stile (of a door)—A vertical member of the door structure; each door has
two: a lock stile and a hinge stile.
Stop (of a lock)—The button, or other small device, that serves to lock
the latch bolt against the outside knob or thumb piece or unlock it if
locked. Another type holds the bolt retracted.
Store Door Handle—A heavy grip or pull mounted on sectional or elongated
plates and provided with a thumb piece to operate the latch trip of a
store door lock.
Strap Hinge—A surface hinge on which one or both leaves are of
considerable length.
Strike—A metal plate or box that is pierced or recessed to receive the
bolt or latch when projected. Sometimes called Keeper.
Surface Hinge—One having both leaves surface-applied.
Swinging Latch Bolt—A bolt that is hinged to a lock front and is
retracted with a swinging rather than a sliding action. Sometimes called
Hinged Latch Bolt.
Swivel Spindle—A spindle having a joint midway in its length to permit
the knob at one end to be made rigid by the stop works while the other
end is free to operate.
T
T Handle—A cross handle for actuating the bolt of a lock and used in
place of a knob.
T Hinge—A surface hinge with the short member attached to the jamb and
the long member attached to the door.
Template Hardware—A term indicating any item of hardware that is made to
template; that is, exactly matching the master template drawing as to
spacing of all holes and dimensions.
Thimble—The socket or bearing attached to an escutcheon plate in which
the end of the knob shank rotates.
Three-Point Lock—A device sometimes required on three-hour fire doors to
lock the active leaf of a pair of doors at three points.
Threshold—A strip fastened to the floor beneath a door, usually required
to cover the joint where two types of floor material meet.
Throw (of a deadbolt or latch bolt)—Measurement of the maximum
projection when bolt is fully extended.
Thumb Piece (of a handle)—The small pivoted part above the grip of a
handle to be pressed by the thumb to operate a latch bolt.
Transom Bar—That part of a door frame that separates the top of a door
or a window from the bottom of the transom.
Transom Catch—A fastener applied to a transom and having a ring by which
the latch bolt is retracted.
Transom Chain—A short chain used to limit the opening of a transom;
usually provided at each end with a plate for attachment.
Transom Lift—A vertically operated device attached to a door frame and
transom by which the transom may be opened or closed.
Tubular Lock (or Latch)—A type of bored lock.
Tumbler—A guard or obstruction that prevents operation of a bolt except
by insertion of the proper key.
Turn Piece—A small knob, lever or tee turn with spindle attached for
operating the deadbolt of a lock or a mortise bolt. Also termed Thumb
Turn.
Two-Point Latch—A device sometimes required on three-hour fire doors to
lock the inactive leaf of a pair of doors at top and bottom.
U
Unit Lock—See Preassembled Lock
Universal—A term used to describe a lock, a door closer or other device
that can be used on doors of any hand without change.
V
Vertical Spring Pivot Hinge—A spring hinge mortised into the heel of a
door and fastened to the floor and head with pivots.
WXYZ
Ward—An obstruction projecting from the lock case of side of a keyhole
intended to prevent entrance or rotation of an improperly cut key. |
