Drilling apparatus

Claim 1

IN A DUPLEX ROCK DRILL RIG AND SUPPORTING APPARATUS FOR DRILLING ROWS OF HOLES IN A FAN SHAPED ARRANGEMENT IN AN UNDERGROUND DRIFT WITH ALL SAID HOLES LYING IN A SINGLE PLANE TRANSVERSELY OF SAID DRIFT AND WITH SAID APPARATUS CARRYING A PLURALITY OF ROCK DRILLS SIMULTANEOUSLY CONTROLLED AND OPERATED BY A SINGLE OPERATOR, THE COMBINATION WHICH COMPRISES A BASE FRAME FOR SUPPORTING SAID APPARATUS AND ADAPTED TO BE MOVED ALONG SAID DRIFT TO SUCCESSIVE DRILLING LOCATIONS, A PAIR OF PARALLEL PIVOT MEANS ARRANGED ABOVE SAID BASE FRAME AND WITH THE AXES THEREOF EXTENDING SUSTANTIALLY LONGITUDINALLY OF SAID BASE FRAME ON EITHER SIDE OF THE CENTRAL VERTICAL LONGITUDINAL PLANE THEREOF, MEANS FOR SUPPORTING SAID PAIR OF PIVOT MEANS ON SAID BASE FRAME, ELONGATED DRILL SUPPORTING MEMBERS WITH ONE END OF EACH ONE JOURNALED ON EACH OF SAID PIVOT MEANS FOR FREE PIVOTING MOVEMENT WITH RESPECT THERETO THROUGH A PLURALITY OF ANGULAR DRILLING POSITIONS DISTRIBUTED IN FAN SHAPE AND ALL OF WHICH LIE SUBSTANTIALLY IN A SINGLE PLANE EXENDING TRANSVERSELY OF SAID BASE FRAME AND PERPENDICULARLY TO SAID CENTRAL VERTICAL LONGITUDINAL PLANE THEREOF WITH EACH OF SAID MEMBERS PIVOTING SUBSTANTIALLY INDEPENDENTLY OF THE OTHER THROUGH OPPOSITE QUADRANTS IN SAID TRANSVERSE PLANE DEFINED BY SAID CENTRAL PLANE AND A HORIZONTAL PLANE THROUGH SAID BASE FRAME, MEANS FOR SUPPORTING AND CARRYING A ROCK DRILL ON EACH OF SAID DRILL SUPPORTING MEMBERS ON THE ENDS THEREOF OPPOSITE SAID PIVOTS FOR MOVEMENT THEREWITH THROUGH SAID ANGULAR DRILLING POSITIONS AND INCLUDING A FEED BAR SLIDABLY SUPPORTING AND FEED SID ROCK DRILL AND CONNECTED TO SAID SUPPORTING MEMBER ADJACENT ONE END OF SAID FEED BAR WHEREBY SAID FEED BAR AND SAID ROCK DRILL ARE DISPOSED IN UPWARD AND OUTWARD DIRECTIONS FROM SAID PIVOTS AND WITH THE ENDS OF SAID FEED BARS ADJACENT SAID SUPPORTING MEMBERS DISPOSED CLOSELY ENOUGH TO SAID SUPPORTING MEMBERS TO AVOID ABUTTING AND INTERFERING CONTACT OF SAID ENDS IN ANY OF SAID ANGULAR POSITIONS OF SAID PIVOTS, AND SEPARATE POWER MEANS OPERATIVELY ENGAGED WITH EACH OF SAID DRILL SUPPORTING MEMBERS FOR MOVING EACH SAID MEMBER INDEPENDENTLY THROUGH ALL SAID ANGULAR DRILLING POSITIONS THEREOF IN SAID TRANSVERSE PLANE AROUND SAID PIVOTS.