System for monitoring the operation of a cage moving in a mine shaft
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United States of America Patent
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-
Dec 10, 1991
Grant Date -
N/A
app pub date -
Oct 25, 1990
filing date -
Nov 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulse encoder digitally derives a first value of speed at which the cage is moving at any given time. An analog device, such as a tachogenerator, derives the second value of the speed, in analog form, at which the cage is moving at the same time. The two speeds are compared in a comparator to determine the differences therebetween. If the difference exceeds a predetermined limit, an emergency stop is tripped to arrest the motion of the cage.
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