STAGEMAKER®
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VERLINDE reserves the right to alter or amend the above information without notice.
11/2008
12.3 Brake/slipping clutch assembly
12.3.1 Operation
Static situation with a load suspended
The torque load is transmitted to brake
thru the pinion (12). The brake linings are
compressing the anchor discs (3 and 6)
due to the force of the springs (4).
Hoisting movement
The load is creating a counter torque on
the gear shaft (12) compared to the motor
torque on the shaft (13). Due to that
torque, the cam system (9, 10, 11) is
opening by compressing the springs (4).
When the cam system opens, it releases
the brake discs ( 1 and 5) which can rotate
freely from the anchor discs (3 and 6)
which are connected to the frame by the
pins (2). The flywheel (8) is transmitting the motor torque to the brake disc (1) thru the clutch lining
(17). The gearbox is then driven by that brake disc (1) thru the pinion (12).
If an overload occurs while hoisting, the clutch lining (17) slides and the load is not lifted.
Lowering movement
The load torque and the motor torque on the brake are in the same direction. Still, when the motor is
powered, the cam system is slightly opened due to the inertia in the flywheel (8) until there is a
balance between the load torque and the motor torque. The load is then lowered at the motor speed
been kept under the control of the friction of the brake linings (16) and the anchor disc (3 and 6). The
heat generated is dissipated in the oil bath.
12.3.2 Adjustment of the slipping clutch :
The brake and the clutch torque are connected to each other. This is due to the fact that the brake
lining (16) diameter is twice the clutch lining diameter (17) and that they are activated thru the same
spring (4). Then, only a clutch setting is required and no brake setting is afterwards needed.
The clutch is set by tightening or loosening the cover (14) to increase or decrease the hoisting
capacity. The clutch setting tool should be connected to the chain. The clutch should then be adjusted
at a level of 125% of the nominal load of the hoist.
)
Remind : The value of the factory setting is 1,4 x the nominal load because friction lining are not
running in yet.
)
In case of adjustment of 250 kg 1 fall or 500 kg 2 falls, the slipping clutch will be adjusted at 250
% of the nominal load. According to the chain force measuring device documentation : 625 for 1
fall and 1250 for 2 falls
