LEVER SCREW: a brass screw which attaches the
lever to the bolt, and acts as a pivot for the lever and
a travel stop for the bolt.
LEVER SPRING: a stainless steel spring (in S&G
locks) which applies directional tension to the lever
or roller fence.
LEVER STOP: a molded portion of the lock
case which prevents the lever from moving to
the unlocked position while the lever is held
out of the drive cam gate by the fence resting
on the circumference of the wheel pack.
S&G 8550 LEVER ASSEMBLY: the attached accelerator
spring provides the downward force
required to engage the lever with the
cam and wheel gates for opening.
BOLT: a blocking bar connected to the
lever screw; it can be retracted when
the proper combination
is dialed.
BALL DETENT: a spring-loaded steel ball (3/16")
that partially engages a cavity in the underside of
the bolt when extended to the locked position; it acts
with the travel stop components to ensure proper
positioning of the bolt.
GATE COVER: prevents the lever
from entering the gates of the zero
change locks while the combination
is changed; also prevents insertion of
the change key until the wheels are
aligned properly.
COMBINATION CHANGE KEY:
a tool used in resetting a key
change wheel.
DOOR THICKNESS: the dimension from the lock
mounting surface on the inside of the door to the front
face of the door.
RELOCK TRIGGER: a com-
ponent located inside the lock
case which prevents the bolt from
retracting in the event the lock
cover is separated from the lock.
THERMAL RELOCKING COMPONENT:
a small tab of soft, low melting point material,
used to activate the relock trigger when the
lock is attacked by heat; its melting tempera-
ture is approximately 165ºF.
HAND OF COMBINATION LOCK: the
orientation of the combination lock within
its mounting; the hand is indicated by the
location of the combination lock bolt.
Vertical Up – bolt is pointing up
Vertical Down – bolt is pointing down
Right Hand – bolt (viewed from back of lock) points right
Left Hand – bolt (viewed from back of lock) points left
CLASSIFICATION: combination locks are classified by
Underwriters Laboratories (in Standard for Safety # UL 768)
as Group 1, Group 1R, or Group 2.
GROUP 1: Those locks that have a high degree of resistance
to expert or professional manipulation. The protection against
professional manipulation includes advanced design features
not found in conventional designs.
GROUP 1R: Those locks that have a high degree of resistance
to expert manipulation and are designed to prevent surreptitious
entry by means of x-ray imaging.
GROUP 2M: Those locks that have a moderate degree of resis-
tance to unauthorized opening, and have passed a two-hour
manipulation resistance test.
GROUP 2: Those locks that have a moderate degree of resistance
to unauthorized opening.
LEVER
SCREW
HOLE
BALL
DETENT
CAVITY
CAVITY FOR END
OF LEVER SPRING
CUTOUT FOR
RELOCK TRIGGER
8
© Copyright 2006, Sargent & Greenleaf, Inc.
Model 6730, 6735, 6738, 6741 Mechanical Combination Lock
Combination Lock Glossary
SAFE LOCK
VAULT LOCK
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