User Guide
PAGE 4
IB/B-T/06
INTERLOCK INSTRUCTION MANUAL
Type DM Access Door Interlock
All Type DM interlocks have two parts: a main body with one or two cylinders and a latch bolt with chain. When the
latch bolt is separated from the main body, the key(s) is trapped in the lock. When the door on which the interlock is
mounted is properly closed, the latch bolt can be inserted into the main body and the key can be turned and released.
Weld or bolt the chain to the door or door-frame allowing enough slack to insert and turn the latch bolt in the Type DM
lock body when the door is properly closed.
DM Terminology and Operating Instructions
Insert Keys
Rotate keys 90 degrees
(clockwise). Grip eyebolt and
rotate latch bolt upward.
The latch bolt is now free
from the lock body
and the keys are trapped.
To Unlock
With eyebolt facing
outward, insert the latch
bolt into the lock body.
To Lock
Grip eyebolt and rotate
latch bolt downward.
Rotate keys 90 degrees
(counterclockwise) and
remove from lock.
Two Cylinder DM
(EE) Instructions
Insert "E" Key
Rotate "E" key 90 degrees
(clockwise). Grip eyebolt and
rotate latch bolt upward.
The latch bolt is now free
from the lock body
and the "E" key is trapped.
To Unlock
Insert the "W" key.
To Lock
Rotate "W" key 90
degrees (clockwise).
Insert latch bolt and rotate
downward to capture
latch bolt in lock body.
The "W" key is trapped.
Rotate the "W" key 90
degrees (counterclockwise)
and remove from the lock.
Rotate "E" key 90 degrees
(counterclockwise) and
remove from the lock.
Two Cylinder DM
(with Personnel Key)
(EW) Instructions
E
W
E
E
W
E
W
W
E
E
W
W
E
W
E
W
Lock Body
Lock Cylinder
Latch Bolt
Access Door
Weld or Bolt
Chain to Door
DM Terminology
Rotate key 90 degrees
(clockwise). Grip eyebolt and
rotate latch bolt upward.
Insert Key
The latch bolt is now free
from the lock body and
the key is now trapped.
To Unlock
With eyebolt facing
outward, insert the latch
bolt into the lock body.
To Lock
Grip eyebolt and rotate
latch bolt downward.
Rotate key 90 degrees
(counterclockwise) and
remove from lock.
Single Cylinder
DM Instructions
The "E" keys can be turned and released when the latch bolt is latched and the "W" keys can be turned and released
when the latch bolt is unlatched.