Mine roof support

A mine roof support for an underground mine gallery comprising sole plate means adapted to rest on the floor of a mine gallery and having a front end directed toward the mine face and an opposite end;

• roof sheild means upwardly spaced from said sole plate means and having a front end directed towards the mine face and an opposite rear end;
• at least one extensible and collapsible prop pivotally connected at opposite ends to said roof shield means and said sole plate means and extending from the latter forwardly and upwardly inclined toward said roof shield means;
• at least one additional extensible and collapsible prop pivotally connected at opposite ends to said roof shield means and said sole plate means and extending from the latter upwardly and rearwardly inclined towards said roof shield means;
• and means for maintaining the position of said props relative to said sole plate means and said roof shield means and comprising a laminescate guide arrangement including two shorter links and one longer link connecting said shorter links and projecting with an end portion beyond the latter, said shorter links being pivotally attached at the ends thereof spaced from said longer link to one of said two first-mentioned means and said end portion of said longer link being pivotally attached to the other of said two first-mentioned means.