Mine roof cable bolt and method

Abstract

A mine roof bolt for use with resin including a strand cable. The bolt includes a head mechanism attached to the strand cable which preferably allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof; although mixing and tightening can occur in the same direction. A method for placing a mine roof bolt in a mine roof.

1 . A mine roof bolt for use in a bore hole of a mine with resin comprising: 
 a strand cable; and    a head mechanism attached to the strand cable which allows the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.    
   
   
       2 . A bolt as described in  claim 1  wherein the head mechanism includes a hollow fixture threaded on the outside through which the cable extends and to which the cable is attached.  
   
   
       3 . A bolt as described in  claim 2  wherein the head mechanism includes a nut threaded to the fixture.  
   
   
       4 . A bolt as described in  claim 3  wherein the fixture has a bottom portion which is beveled internally.  
   
   
       5 . A bolt as described in  claim 4  wherein the head mechanism includes wedges which are disposed in the beveled portion to grip the cable.  
   
   
       6 . A bolt as described in  claim 5  wherein the fixture has an upper end which is swaged to the cable.  
   
   
       7 . A bolt as described in  claim 6  wherein the head mechanism includes a stop mechanism disposed between the end of the fixture and the wedges to prevent the nut from coming off as the fixture is spun backwards opposite of its threads to cause the cable to mix the resin.  
   
   
       8 . A mine roof bolt for use with resin comprising: 
 a strand cable; and    means for allowing the strand cable to be turned in a first direction for mixing the resin and in a second direction opposite the first direction for tensioning the strand cable in the mine roof.    
   
   
       9 . A method for placing a mine roof bolt in a mine roof comprising the steps of: 
 placing a resin cartridge in a bore hole in the mine roof;    inserting the strand cable of the bolt into the borehole so it pierces the cartridge;    rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin; and    rotating the head mechanism in a second direction opposite the first direction to tension the cable bolt in the mine roof.    
   
   
       10 . A method as described in  claim 9  including the step of spinning the fixture of the head mechanism in a direction opposite of threads on the fixture.  
   
   
       11 . A method as described in  claim 10  wherein the spinning step includes the step of preventing a nut of the head mechanism from coming off with a stop mechanism of the head mechanism.  
   
   
       12 . A method as described in  claim 11  wherein the rotating in a second direction step includes the step of turning the nut in the second direction after the resin has set to tension the bolt.  
   
   
       13 . A mine roof bolt for use in a bore hole of a mine with resin comprising: 
 a strand cable; and    a head mechanism attached to the strand cable, the head mechanism includes a hollow fixture made from hot rolled all thread bar threaded on the outside through which the cable extends and to which the cable is attached, and a nut threaded to the fixture.    
   
   
       14 . A bolt as described in  claim 13  wherein the fixture has a bottom portion which is beveled internally.  
   
   
       15 . A bolt as described in  claim 14  wherein the head mechanism includes wedges which are disposed in the beveled portion to grip the cable.  
   
   
       16 . A method for placing a mine roof bolt in a mine roof comprising the steps of: 
 placing a resin cartridge in a bore hole in the mine roof;    inserting the strand cable of the bolt into the bore hole so it pierces the cartridge;    rotating a head mechanism of the bolt attached to the strand cable in a first direction to rotate the strand cable and mix the resin;    stopping the rotation of the head mechanism; and    rotating the head mechanism in the first direction to tension the cable bolt in the mine roof.