Temporary roof support system with anti-rotation feature

Abstract

A temporary roof support system with an anti-rotation feature is provided. The temporary roof support system includes a base, a multistage hydraulic cylinder, a multistage telescopic cover assembly and a locking tube assembly. The multistage telescopic cover assembly encompasses the multistage hydraulic cylinder, and includes a first plurality of cylinders of successively differing diameters disposed coaxially. The locking, tube assembly includes a second plurality of cylinders disposed coaxially and of successively differing diameters including an outermost cylinder and an innermost cylinder. The second pivot end of the locking tube assembly is coupled to the crossbar and the first pivot end of the locking tube assembly is coupled to the base, and a length of the locking tube assembly is parallel to the vertical axis.

What is claimed is: 
     
         1 . A temporary roof support system for a roof bolter machine, the temporary roof support system comprising:
 a base;   a multistage hydraulic cylinder having a first end and a second end, the multistage hydraulic cylinder mounted on the base at the first end, the multistage hydraulic cylinder extendable along a vertical axis;   a multistage telescopic cover assembly encompassing the multistage hydraulic cylinder, and coupled to the multistage hydraulic cylinder at the second end, the multistage telescopic cover having a first plurality of cylinders of successively differing diameters disposed coaxially within the multistage telescopic cover;   a crossbar coupled to the multistage hydraulic cylinder at the second end, the crossbar coupled to the multistage hydraulic cylinder at a center of the crossbar using a pivot joint;   a locking tube assembly having a first pivot end and a second pivot end, the locking tube assembly including:
 a second plurality of cylinders including an outermost cylinder and an innermost cylinder, the second plurality of cylinders being coaxially disposed and having successively differing diameters; 
 a first mounting eye at the first pivot end, the first mounting eye coupled to the innermost cylinder; 
 a pair of mounting eyes at the second pivot end, the pair of mounting eyes coupled to the outermost cylinder; 
   wherein the second pivot end of the locking tube assembly is coupled to the crossbar and the first pivot end of the locking tube assembly is coupled to the base, and wherein a length of the locking tube assembly being parallel to the vertical axis.