BEST ACCESS SYSTEMS 1E Series, Service Manual

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Glossary
C–2 E Series Service Manual
Dummy cylinder Nonfunctional cylinder without an operating mechanism used for
appearance only. Dummy cylinders are available for mortise and rim
locks.
Faceplate Part of the mortise lock that serves as a facing or covering over the front
of the lock.
Hand-of-door Opening direction of the door. A right-hand door (RH) is called “right-
hand” because it is opened with the right hand. A right-hand door is
hinged on the right and swings inward when viewed from the outside.
A left-handed door (LH) is hinged on the left and swings inward when
viewed from the outside. If a door swings outward, it is referred to as a
right hand reverse bevel door (RHRB) or a left-hand reverse bevel door
(LHRB).
Latchbolt Beveled, spring-actuated, bolt which may or may not include a
deadlocking feature. The latchbolt must be actuated by a key, knob, or
turn knob.
Lock Device that secures openings and entrances such as doors, gates,
cabinets, and so forth. Locks include mechanical, electromechanical,
and electronic security devices.
Mortise Rectangular cavity cut into the edge of a door. Mortise also can mean
the act of making such a cavity.
Mortise cylinder Threaded lock cylinder that screws directly into the lock case; usually
includes a key-driven rotating cam, attached to the back of the cylinder,
which drives the locking mechanism. The cylinder houses the BEST
interchangeable core.
Mortise lock Lock that fits into a mortise. Other locks fit into bored holes or mount
to a surface.
Rim cylinder Lock cylinder that is secured to a door with a clamp plate and clamp
screws. The rim cylinder’s spindle actuates the bolt or latch. The
cylinder houses the BEST interchangeable core.
Shifting cam Spring-loaded cam that shifts back to actuate another mechanism.
Spindle Unit on a rim cylinder lock, which actuates the bolt or latch when the
key is turned.
Throw member Connecting piece between core and lock mechanism that transfers key
motion to the locking device.
Thumbturn Part that someone grips between the thumb and forefinger, and turns to
project or retract a bolt.