Excavating or drilling device

Claim 1

IN A DRILLING DEVICE FOR DRILLING HOLES DOWNWARDLY IN THE EARTH, A VERTICALLY DISPOSED DERRICK, A VERTICAL TRACKWAY MOUNTED IN THE DERRICK, A PLATE VERTICALLY MOVABLY MOUNTED ON THE TRACKWAY, A DRILL BAR EXTENDING VERTICALLY DOWNWARDLY FROM SAID PLATE, MEANS INTERCONNECTING THE PLATE AND DRILL BAR FOR PERMITTING ROTATION OF THE DRILL BAR IN RELATION TO THE PLATE AND PREVENTING LONGITUDINAL MOVEMENT OF THE DRILL BAR IN RELATION TO THE PLATE, MEANS ON THE LOWER END OF THE DERRICK DRIVINGLY ENGAGING THE DRILL BAR DURING VERTICAL MOVEMENT THEREOF, AND MEANS INTERCONNECTING THE DERRICK AND SAID PLATE FOR RECIPROCATING THE PLATE AND DRILL BAR IN RELATION TO THE DERRICK, SAID LAST NAMED MEANS INCLUDING HYDRAULIC AND MECHANICAL CABLE MEANS FOR MULTIPLYING THE MOVEMENT OF THE HYDRAULIC MEANS FOR RECIPROCATING THE PLATE A RELATIVELY LONG DISTANCE IN RELATION TO THE DISTANCE OF EXPANSION AND CONTRACTION OF THE HYDRAULIC MEANS, SAID HYDRAULIC AND CABLE MEANS INCLUDING A VERTICALLY ELONGATED STATIONARY HOLLOW ROD MOUNTED IN THE DERRICK, SAID ROD HAVING A PISTON FIXED THEREON ADJACENT THE CENTER THEREOF, A CYLINDER SLIDABLY MOVABLY MOUNTED ON SAID ROD AND ENCOMPASSING SAID