Unit unlocks, opens and locks open; or
unlocks, closes and deadlocks closed,
an individual door.
Movement of a door may be stopped in
mid-travel to reverse its direction. When
interrupted, the door is not freewheeling.
Interlocking: Any door not closed and
deadlocked will also prevent electric
operation of all other interlocked doors.
Manual emergency locking, unlocking
and operation is accomplished by a
clutch release and crank located in the
locking column.



Type D Operators are high security,
motorized door operating systems for
use with doors weighing up to 450
NOTE: Units may be adapted to operate
doors up to 1,000 pounds
Type D Operators should be specified
for entrances, security vestibules, or
corridor doors in maximum security
areas. May also be specified for exterior
pedestrian gate applications.

© 2017, Best Brothers Group. All rights reserved.


Folger Adam

Locking System

The door automatically deadlocks
closed at two concealed points at the
rear edge of the door. Locking
components are not exposed at the
front edge of the door and, therefore,
not subject to tampering. No
components project into the door

© 2017, Best Brothers Group. All rights reserved.


Type D Operators have been in service
since 1949, and tested to 500,000

© 2017, Best Brothers Group. All rights reserved.

Standard Features

■ Motor voltage – 208 VAC.
■ Rugged chain drive – Provides
consistent action of the door under a
variety of conditions and installation
■ Heavy duty construction – Type D
Operators are ruggedly built for a
range of detention environments.
■ Tamper-resistance – All openings in
housings are baffled to preclude
inmate tampering.
■ Sloped-top housing – Resists hiding
of contraband.
Flat-top housing is provided where
operator must install close to ceiling.
■ Automatic deadlocking – Doors
automatically deadlock at two
concealed points at the rear of the
door on closure.
■ Indication switch – An internal switch
monitors deadlocked condition of
both locking points
■ Terminal strip – All internal
components are pre-wired to a
terminal strip. The strip is also used
for ease of field wiring.
■ Adjustable friction clutch – In case of
door blockage, clutch slips until
obstruction is removed. If not
removed, power to the motor is cut to
avoid damage. Adjustment is
provided to compensate for various
sizes and weights of doors.
■ Emergency manual unlocking and
operation – In event of power failure,
unlocking the column provides access
to the release mechanism. The door
may then be operated by

© 2017, Best Brothers Group. All rights reserved.

Optional Features

■ Electrical control cabinet – Control
cabinets may be furnished to house
all wiring and switches for each door
controlled. Three push buttons are
provided for each door, labeled:
OPEN-CLOSE-STOP. Two indicator
lamps above the push buttons
indicate door position:
Red – OPEN.
Green – CLOSED and deadlocked.

© 2017, Best Brothers Group. All rights reserved.