4. 3 Special features
(1) Motor brake
The motor brake is unique with the pull rotor braking structure and its powerful braking force enables the hoist
to support the load surely. Non-asbestos material is used in the motor brake.
(2) Hook and hook latch
The hook is drop-forged from the special carbon steel and will not fracture but will open gradually when
overloaded. In addition, the hook is equipped with a hook latch which acts to keep the load captive in the hook
under slack load conditions.
(3) Limit switch
An electric limit switch mechanism is employed to prevent overwinding.
Refer to table 4-1 to make sure which models are equipped with the limit switch as a standard or optional
feature.
(a) Upper limit switch
The hoist is automatically stopped instantly in case of overlifting.
(b) Upper /lower limit switch
The hoist is automatically stopped instantly in case of overwinding.
(4) Friction clutch
The friction clutch mechanism, originally developed by KITO, enables the motor to idle when excessively
overloaded or overwinded. Thus the mechanism prevents damage due to overload or overwind. Non-asbestos
material is used in the friction clutch.
(5) Emergency stop device
This device is an option for the electric chain hoist, a standard for the electric chain hoist with motorized
trolley.
The mushroom type button, in red at the uppermost position on the pendant switch, is used stop the hoist and
trolley in an emergency situation. When pressed, power to the equipment is shut off and the button locks
automatically. Turn it to the right to release the locks and to enable re-start.
The set value (1.25 times or more) may change
if loads over the WLL are lifted often.
− 9 −
Fig. 4-1 Friction clutch
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