Shield timbering frame for timbering mines

A shield timbering frame for timbering mines adapted to be located adjacent a mining face, comprising, a horizontal floor-engaging skid, a breaking shield extending obliquely over said skid and having a lower end and an opposite upper end, a pair of lemniscate guide rods having their one ends connected to said breaking shield at longitudinally spaced locations adjacent said lower end of said breaking shield and having an opposite end connected to said skid at longitudinally spaced locations adjacent the inner end of said skid, a roof cap member having an inner end pivoted to the upper end of said breaking shield and having an opposite outer end adapted to extend toward the mining face, at least one hydraulic ram engaged on said skid and pivotally connected to said roof cap at a spaced location from said inner end which is pivoted to said upper end of said breaking shield, said ram being made up of at least three telescopically interengaged, extensible and retractable parts, said ram extending perpendicularly from said skid, and pressure valve means associated with said ram to provide a substantially equal support pressure by said ram on said roof cap in an uppermost position and in a plurality of positions below said uppermost position, said ram extending perpendicularly from said skid in all positions of said roof cap.