Articulated mine door opening mechanism
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United States of America Patent
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Jan 22, 2019
Grant Date -
May 11, 2017
app pub date -
Nov 4, 2016
filing date -
Nov 6, 2015
priority date (Note) -
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Abstract
A mine door system which includes a mine door having a door leaf, and a door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively smaller door-moving force to the door leaf and moves it at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf and moves it at a second speed less than the first speed.
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