UPPER AND LOWER LIMIT DETECTING APPARATUS AND METHOD FOR ELECTRIC CHAIN BLOCK
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United States of America Patent
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Issued Date -
Feb 1, 2024
app pub date -
Nov 9, 2021
filing date -
Dec 11, 2020
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Abstract
An upper and lower limit detecting apparatus and method for a load suspending device of an electric chain block capable of easily and rapidly detecting reaching of the load suspending device to a lower limit without providing a lower limit reaching detection limit switch. In an electric chain block including electric motor, friction clutch, electromagnetic brake, speed reduction gear mechanism, load sheave, load chain, load suspending device, etc., the reaching of the load suspending device to the upper limit is detected by an upper-limit reaching detection limit switch, and the reaching of the load suspending device to the lower limit is detected by judging, with an electric power type overload limiter, that the power consumption of the electric motor has exceeded a predetermined value as a result of a stopper abutting against a chain guide and the friction clutch being dragged by rotational force of the electric motor.
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