Mining machine with rotary cutter horizontally slidable on vertically adjustable guide

Claim 1

A MINING MACHINE FOR WORKING AGAINST AN EARTH FACE COMPRISING A FRAME, AN ARM ASSEMBLY TRANSVERSELY PIVOTED AT ITS REAR END TO OPPOSITE SIDES OF THE FRAME AND EXTENDING FORWARDLY WITH RESPECT TO THE FRAME, SAID ASSEMBLY BEING FORMED BY TWO SEPARATE ARMS CONNECTED BY A TRANSVERSE BRACE THEREBY FORMING A STIFF H-SHAPED STRUCTURE, MEANS FOR RAISING AND LOWERING SAID ASSEMBLY, A TRANSVERSE ELONGATED GUIDE BAR TRANSVERSELY PIVOTED AT SPACED POINTS TO THE FORWARD END OF SAID ASSEMBLY, A CARRIER SLIDABLY MOUNTED FOR LENGTHWISE MOVEMENT ALONG SAID BAR, MEANS FOR MOVING SAID CARRIER IN EITHER DIRECTION ALONG SAID BAR, A CUTTING HEAD MOUNTED ON SAID CARRIER FOR ROTATION ABOUT A FORWARDLY DIRECTED AXIS, MEANS FOR ROTATING THE CUTTING HEAD, TWO SEPARATE LINKS PARALLEL TO THE RESPECTIVE ARMS OF SAID ARM ASSEMBLY, SAID LINKS CONNECTING SAID GUIDE BAR TO SAID FRAME TO MAINTAIN SAID CUTTING HEAD AXIS HORIZONTAL IN ALL ADJUSTED POSITIONS, AND MEANS ON SAID FRAME FOR BODILY ADVANCING SAID GUIDE BAR HORIZONTALLY IN THE FORWARD DIRECTION OF THE MACHINE WHEREBY SAID CUTTING HEAD MAY BE MOVED STRAIGHT INTO SAID EARTH FACE TO MINE THE MATERIAL IN THE SAME BY MOVEMENT OF SAID CARRIER ALONG SAID BAR AND RAISING AND LOWERING OF SAID ARM ASSEMBLY.