Overwind conveyance drop protection
AssigneeTechnological Resources Pty. Limited
InventorsRocky Lynn Webb, Fredric Christopher Delabbio
Life of this patent
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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.
Claims20
A hoist system for hoisting a conveyance from a mineshaft, wherein the conveyance is a skip, the system 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 capable of retarding upward movement of the conveyance, by undergoing plastic deformation, as the conveyance approaches the crash barrier.
The hoist system as claimed in 7, wherein the jack catcher comprises pivoting jack catches on the headframe engageable with lugs on the conveyance to catch the conveyance against downward movement.
Apparatus for removing excavated material from a mineshaft during formation of the mineshaft, comprising:
- a material conveyance moveable up and down within the shaft intermittently to receive discrete loads of material excavated in the formation of the shaft and transport that material to a top of a mineshaft for discharge, the material conveyance being a skip;
- and
- a hoist system installed at the top of the mineshaft and operable to hoist said material conveyance, the hoist system 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 capable of retarding upward movement of the conveyance, by undergoing plastic deformation, as the conveyance approaches the crash barrier.
A hoist system for hoisting a conveyance from a mineshaft, the conveyance being a skip, the hoist system 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;
- an upper conveyance retarder capable of retarding upward movement of the conveyance, by undergoing plastic deformation, as the conveyance approaches the crash barrier;
- and
- a lower crash barrier having an open condition in which to allow upward and downward movements of the conveyance from and into the mineshaft, and a closed condition to prevent debris from falling into the mineshaft;
- wherein upward movement of the conveyance triggers release of the lower crash barrier to move to its closed condition.
Dependencies are inferred from the claim text.