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secret that may not be reproduced, disclosed to third parties, altered or otherwise employed in any manner whatsoever without the express written consent of R&M Materials
Handling Inc. Copyright 2020 © R&M Materials Handling Inc. All rights reserved.
4.2.2
How the hoisting function works
KINEMATIC CHAIN FOR ELECTRICAL CHAIN HOIST
Pos.
Part
1
Adjustment screw
2
Gear
3
Chain sprocket
4
Motor
5
Friction torque limiter
6
Brake
7
Motor torque
8
Brake torque
Motor torque path
The motor (4) rotates the axle, which makes the hoisting gear (2) helical steps turn. The gear transfers the motor
power over the chain sprocket (3) to the hoisting chain, which then moves according to the selected direction (up or
down).
The assembly includes a friction torque limiter (5) that allows the lifting of loads that correspond to 110 % of the
nominal SWL (safe working load = rated capacity) and prevents from lifting loads that exceed 160 % of the SWL.
An overload slips the friction torque limiter, allowing the motor to continue running and preventing the hoist from
taking an overload that can damage the hoist.
