DE-STA-CO TG20 - Manual (Page 2)

mechanical
torque-limiting
overload clutch
Installation–Operation
and Maintenance Instructions
1. Read your Torq-Gard Installation-Operation Instructions
thoroughly before operating the unit, for your safety and the
protection of your equipment.
2. Double check to be sure the power is off and cannot be turned
on while working on the equipment.
3. Electrical power should be disconnected at the fuse box, circuit
breaker or motor starter.
4. The Torq-Gard Clutch is designed to protect your machine and
will not protect against bodily injury.
5. Keep all objects such as hands, clothing, tools, etc. away from
rotating or moving parts.
6. Use safety glasses or equivalent to protect your eyes.
7. Do not manually re-engage the Torq-Gard Clutch. (Refer to
“Automatic Reset” instruction.)
8. Do not adjust the torque while the clutch is disengaged. (Refer
to “Torque Setting” instruction.)
9. Do not exceed the recommended maximum RPM. (Refer to
Torq/Gard Rating Chart.)
10. The detector mechanism must electrically disconnect the prime
mover at the recommended RPM settings. (Refer to “Overload
Detection” instruction.)
11. Shaft mounting set screws must clear the mounting bosses or
the clutch will not release upon overload. (Refer to “Mounting
the Torq/Gard” instruction.)
12. Shaft and detector mounting set screws must be tight and the
recommended number used. (Refer to “Mounting the Torq/Gard”
instruction.)
The above list includes major safety points to be observed, but
should not be considered as limiting in safety precautions to be
followed.
Operating Principle
Torq/Gard Overload Clutches help protect the entire drive train of
your machinery from damage due to excessive torque generated by
overloads and jamming. The torque is adjusted by turning the single
hex-socket head control which adjusts the Torq/Gard Clutch
precisely to any setting within its load range. A spring-loaded cam
follower seated in a single hub cam detent causes the hub and
clutch body to rotate as a unit. The two point contact of the follower
produces equal forces within the cam detent, minimizing the effect
of “breathing”, found in conventional clutches. When the pre-set
torque limit is exceeded by an overload condition, the follower is
instantly released from the cam detent, disconnecting the hub from
the body. Either the hub or the body may be used as the input or
output.
NOTE: During overload, the Torq/Gard produces a loud audible
report, which is a normal operating characteristic of the clutch.
In direct coupled applications, the modular designed Torq/Gard can
be used with Browning Ever-Flex Couplings or Chain Coupling Kits,
without modification to the clutch or couplings. Split taper bushings
are available for the coupling output.
Browning Torq/Gard single strand sprockets, for No. 40, 60, 80, and
100 ANSI Standard Roller Chain Drives, mount directly to the clutch.
Browning Torq/Gard Gearbelt Pulleys are also available for 1/2”
Pitch Belts.
Before mounting the clutch on the driving or driven shaft, your choice
of coupling or sprocket should be attached to the Torq/Gard Clutch.
Sprocket Installation
Browning Torq/Gard Single Strand
Sprockets register with the drilled and
tapped mounting lugs on the adapter
end of clutch. Torq/Gard Chain Drives
can be used as the driving or driven
member. See page 6 for sprocket
availability.
1. Place the sprocket on the registered
mounting lugs.
2. Select the correct length Hex. Head
Cap Screws (3 required) from Table A.
Warning: Short Screws may strip the mounting lug threads.
3. For maximum locking effect, (medium) spring lock washers
should be used under the Hex. Head Cap Screws.
Table A–Sprocket Mounting Hardware
TG3/6 TG35A__K #8-32 X .50 HHCS
TG20 20TG40A__K #10-24 X .62 HHCS
TG60 TG40A__K 1/4-20 X .75 HHCS
TG200 TG60A__K 3/8-16 X 1.00 HHCS
TG400 TG80A__K 1/2-13 X 1.50 HHCS
TG800 TG100A__K 1/2-13 X 1.75 HHCS
Gear Belt Pulley Installation
Follow the above mounting instructions for the Browning Torq/Gard
Gear Belt Pulleys, using the longer Hex. Head Cap Screws supplied
with the pulleys.
Chain Coupling Installation
1. Select the Browning Chain Coupling
components from page 6 for the
applicable Torq/Gard Model.
2. Mount the single strand sprocket per
the above “Sprocket Installation”
instructions.
3. Place the Split Taper Bushing
Sprocket over the Single Sprocket,
with the corresponding teeth in
alignment.
4. Secure the two sprockets by wrapping the double strand roller
chain around the sprockets, insuring that the sprocket teeth fully
engage the chain.
torq/gard ™
2