Overwind conveyance drop protection
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United States of America Patent
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Dec 11, 2018
Grant Date -
May 5, 2016
app pub date -
Jun 6, 2014
filing date -
Jun 7, 2013
priority date (Note) -
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Abstract
A hoist system for hoisting a conveyance from a mineshaft, comprising: a head frame mounted over the mineshaft; a hoist connected to the conveyance by an elongate flexible hoisting element so as to be operable to hoist the conveyance from the mineshaft by winding the hoisting element; an upper crash barrier located on the head frame so as to be engageable by the conveyance to prevent upward movement of the conveyance beyond the crash barrier in an overwind condition; and an upper conveyance retarder to retard upward movement of the conveyance as it approaches the crash barrier.
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