Unit unlocks, opens or closes and locks
closed pre-selected individual doors or
door groups, via optional electric
controls. Gang release is via mechanical
release cabinet.
Door movement may be stopped in
mid-travel, leaving the door in a fixed
(non-movable) position. The door must
be moved (restarted) electrically or
mechanically to the open or closed
position to lock.
Direction of movement of any
individual door may be reversed
without interrupting the movement of
any other door in the group.
When a single door is blocked, there is
no interruption in operation of any
other door in the group. On removal of
the blockage, the door will automatically
continue to the open or closed position.
In event of emergency, all doors may
be unlocked from the mechanical
release cabinet. In mechanical mode,
the motor is disengaged from the rack,
and doors may be unlocked or relocked
using a special tool.
In event of power failure, all doors
remain in a fixed position, and must be
operated mechanically. Doors are freewheeling
when released.

SKU: 3B-2 Category:


Type 3B.2 locking devices are high
security, motorized cell door operating
and locking systems for use with doors
not exceeding 300 pounds.
3B.2 devices are applicable to multiple
cell or inmate room situation. Optional
controls provide selective operation
of single or groups of doors

© 2017, Best Brothers Group. All rights reserved.


Folger Adam

Locking System

Upon closure, each door automatically
locks at two concealed points at the rear
edge of the door. No locking
components are exposed at the front
edge of the door where they might be
subject to tampering. Components do
not project into the door opening.

© 2017, Best Brothers Group. All rights reserved.


Type 3B Series have been in service
since 1972 and has been tested to
500,000 cycles.

© 2017, Best Brothers Group. All rights reserved.

Standard Features

Motor voltage – 120 VAC.
■ Rack and pinion gear drive.
■ Heavy duty construction – 3B.2
devices are built for the rigors of
maximum security applications.
■ Tamper-resistance – Openings in
housings are baffled to preclude
inmate tampering.
■ Selective operation – Single or
groups of doors may be
simultaneously opened, or closed and
■ Sloped-top housing – Resists hiding
of contraband. Flat-top housing is
provided where the device must
install close to the ceiling.
■ Automatic locking – When fully
closed, top and bottom locking points
on the rear of each door are forced
down into the deadlocked position.
■ Indication switch – Monitors the
locked condition of both locking
■ Gang release – From mechanical
release cabinet.
■ Self-contained – A continuous,
surface-mounted housing contains the
drive and mechanical release
mechanisms and wiring.
■ Full length wire tray – Simplifies
routing of electrical wire/harnesses.
Runs the full length of the housing.
■ Terminal strips – All internal
components are pre-wired to a
terminal strip. The strip is also used
for ease of field wiring.

© 2017, Best Brothers Group. All rights reserved.

Optional Features

■ Mechanical release cabinet – See
page D21-22.
■ Key switches – May be added in
columns or nearby for local electric
■ Electrical/mechanical controls –
Electrical switches may be specified to
provide control of each door in
addition to mechanical function.
These switches may be built into the
same cabinet as the mechanical
levers, or located at a remote console,
as needs dictate. The following switch
functions are available:
Three-position operating switches –
Group switch – Provides group
control (OPEN-OFF-CLOSE).
Power cut-off switch – Cuts off
electrical current to controls.
Indication Lamps – Red and green
indicator lamps may be installed in
conjunction with switches to show
locked, closed, or open status of each
door. When used, the indication is as
Red – Unlocked, moving or stopped
in mid-travel.
Green – Locked closed.
■ Custom graphic consoles – In many
cases, it may be desirable to separate
electric controls from the mechanical
release cabinet located near the cells.
For larger installations, or those with
particular needs, custom-built control
consoles may be easily provided with
floor plan graphics screened on the
control panel, and an array of
specialized features.
■ Cell line cable – For applications
using a series of locking devices, a
cell line cable may be specified to
interconnect to terminal strips in the
mechanical control/release cabinet.
Simplifies routing of wire and saves
installation cost and time.
■ G90 galvanized finish available.

© 2017, Best Brothers Group. All rights reserved.