Articulated mine door opening mechanism
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United States of America Patent
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Aug 12, 2014
Grant Date -
Aug 25, 2011
app pub date -
Feb 19, 2010
filing date -
Feb 19, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A mine door system comprising at least one mine door leaf hinged at one side thereof to a door frame defining an entry. The system includes an articulated door-moving mechanism that articulates between a first configuration in which the mechanism applies a relatively small door-moving force to the door leaf to move the door leaf at a first speed and a second configuration in which the mechanism applies a larger door-moving force to the door leaf to move the door leaf at a second speed less than the first speed. A related method is also disclosed.
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