Drill rigs

Claim 1

IN A SUPPORT APPARATUS OF THE CHARACTER DESCRIBED FOR SUPPORTING THE MOVEMENT AND PLACEMENT OF ROCK DRILLS AND THE LIKE TOWARD A WORKING SURFACE AND FOR PROVIDING ACCESSIBILITY THEREFOR IN RESTRICTED WORKING AREAS AND HAVING AN ELONGATED UNDERFRAME, WHEEL DISPOSED ON SAID UNDERFRAME FOR THE MOVEMENT AND SUPPORT THEREOF AND AT LEAST ONE VERTICAL STANDARD DISPOSED SUBSTANTIALLY AT EACH END OF SAID UNDERFRAME, THE COMBINATION WHICH COMPRISES A SUPPORT DISPOSED ON SAID STANDARDS TRANSVERSELY OF SAID UNDERFRAME PROVIDING A SUBSTANTIALLY UNOBSTRUCTED WORKING SPACE BETWEEN SAID STANDARDS AND BELOW SAID TRANSVERSE SUPPORTS DISPOSED THEREON, MEANS FOR AFFIXING SAID SUPPORTS ON SAID STANDARDS SELECTIVELY IN ALTERNATIVE POSITIONS THEREALONG, MEANS FOR ELEVATING AND LOWERING SAID SUPPROTS IN UNSION ALONG SAID STANDARDS, AN ELONGATED FEED BAR EXTENDING LONGITUDINALLY OF SAID UNDERFRAME FOR SUPPORTING A ROCK DRILL THEREON WITH EACH END THEREOF DISPOSED ON ONE OF SAID TRANSVERSE SUPPORTS, SAID FEED BAR INCLUDING TRANSVERSE STOPS FOR ENGAGEMENT WITH FEEDING MECHANISM ON SAID ROCK DRILLS FOR SAID MOVING OF SAID DRILL TOWARD SAID WORKING SURFACE TO BE DRILLED, AND MEANS FOR CONNECTING SAID FEED BAR TO SAID TRANSVERSE SUPPORTS FOR SELECTIVELY AFFIXING SAID FEED BAR THEREON IS ALTERNATIVE POSITIONS THEREALONG TRANSVERSELY OF SAID UNDERFRAME.