The Weinstein & Holtzman School / Glossary

G L O S S A R Y O F T E R M S

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All

Deadbolt(of a lock)

A lock bolt having no spring acton nor bevel, and which is operated by a key or a turn piece.

Deadlock

A lock equipped with a cleadbolt 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 also 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, 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