Mine roof cable bolt, coupler and method

Abstract

A metal coupling used to join a strand cable with a threaded metal mine roof bolt includes a first portion having a first opening that is threaded to receive an engage with the bolt. The coupling includes a second portion having a second opening to receive and engage with the cable. A mine roof support includes a strand cable. The support includes a threaded metal mine roof bolt. The support includes a metal coupling which joins the strand cable with the threaded metal mine roof bolt that supports at least 1 ton of load from a mine roof when disposed in the mine roof. A method for forming a mine roof support includes the steps of screwing a threaded metal mine roof bolt into a first opening that is threaded of a metal coupling. There is the step of inserting a strand cable into a second opening of the metal coupling. There is the step of swagging the cable inside the coupling.

1 . A mine roof support comprising:
 a strand cable;   a threaded metal mine roof bolt; and   a metal coupling which joins the strand cable with the threaded metal mine roof bolt that supports at least 1 ton of load from a mine roof when disposed in the mine roof.   
   
   
       2 . A support as described in  claim 1  wherein the strand cable is swagged inside the coupling. 
   
   
       3 . A support as described in  claim 2  wherein the threaded metal mine roof bolt is threateningly engaged inside the coupling. 
   
   
       4 . A support as described in  claim 3  wherein the bolt is swagged inside the coupling. 
   
   
       5 . A support as described in  claim 3  wherein the strand cable is plain, galvanized, epoxy coated, or covered with grit to enhance its grip. 
   
   
       6 . A support as described in  claim 1  including a mechanical expansion anchor and a second metal coupling to affix a mechanical expansion anchor at the top of the cable. 
   
   
       7 . A support as described in  claim 2  including an expansion anchor attached to the bolt. 
   
   
       8 . A support as described in  claim 7  including a bearing plate attached to the bolt. 
   
   
       9 . A support as described in  claim 8  including a resin cartridge. 
   
   
       10 . A support as described in  claim 9  including means for mixing resin in the resin cartridge placed on the strand cable. 
   
   
       11 . A support as described in  claim 10  wherein the mixing means is buttons swagged to the cable, or a spiral wire mixer affixed around the cable. 
   
   
       12 . A metal coupling used to join a strand cable with a threaded metal mine roof bolt comprising:
 a first portion having a first opening that is threaded to receive an engage with the bolt; and   a second portion having a second opening to receive and engage with the cable.   
   
   
       13 . A method for forming a mine roof support comprising the steps of:
 screwing a threaded metal mine roof bolt into a first opening that is threaded of a metal coupling;   inserting a strand cable into a second opening of the metal coupling; and   swagging the cable inside the coupling.   
   
   
       14 . A method for reinforcing a mine roof comprising the steps of:
 placing a resin cartridge into a hole in the mine roof;   puncturing the cartridge with a strand cable attached to a metal coupling at the coupling's first end, with a threaded metal bolt attached to a threaded second end of the coupling of a bolt; and   rotating the bolt to mix the resin and to set an expansion anchor attached to the threaded bolt.