Method of opening a mine door leaf
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United States of America Patent
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May 17, 2016
Grant Date -
Oct 23, 2014
app pub date -
Jul 1, 2014
filing date -
Feb 19, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method of opening a mine door leaf installed in a mine passageway having a high pressure zone and a low pressure zone. The method includes the steps of operating a variable-throw crank mechanism in a first configuration having a first crank length to apply a first force to the mine door leaf to move at a first speed, operating the variable-throw crank mechanism in a second configuration having a second crank length less than the first crank length to apply a second force greater than the first force to the mine door leaf to move at a second speed slower than the first speed, and using a resistance pressure associated with the high and low pressure zones in the mine passageway to convert the variable-throw crank mechanism from the first configuration to the second configuration.
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