Power drill with lubricator

Claim 1

A POWER DRILL ASSEMBLY FOR WORKING STONE AND INCLUDING A LUBRICATING SYSTEM, SAID ASSEMBLY COMPRISING, IN COMBINATION, A HOUSING HAVING ARRANGED THEREIN: AN AXIALLY VIBRATABLE DRILLING TOOL; MEANS FOR VIBRATING SAID TOOL IN THE AXIAL DIRECTION THEREOF AND INCLUDING A CYLINDER, A FREELY MOVABLE MASS SLIDABLY ARRANGED IN SAID CYLINDER AND ENGAGING SAID TOOL, A PISTON ALSO SLIDABLY ARRANGED IN SAID CYLINDER AND BEING AXIALLY SPACED FROM SAID MASS THEREBY TO FORM AN AIR CUSHION BETWEEN SAID MASS AND SAID PISTON, A CRANK DRIVE FOR RECIPROCATING SAID PISTON IN SAID CYLINDER, A DRIVE FOR RECIPROCATING SAID PISTON DRIVE SO THAT ON THE FORWARD STROKE OF THE CRANK DRIVE PRESSURE MAXIMA ARE PRODUCED WITHIN THE AIR CUSHION AND ON THE RETURN STROKE PRESSURE MINIMA ARE PRODUCED WITHIN THE AIR CUSHION; AT LEAST ONE AIR-PASSAGE VALVE ARRANGED FOR COACTING WITH SAID CYLINDER FOR PERIODICALLY PLACING THAT PORTION OF SAID CYLINDER IN WHICH SAID AIR CUSHION IS LOCATED IN COMMUNICATION WITH THE INTERIOR OF THE DRILL HOUSING; AN OIL RESERVOIR; AND CONDUIT MEANS COMMUNICATING WITH THAT PORTION OF SAID CYLINDER IN WHICH SAID AIR CUSHION IS LOCATED AND SAID OIL RESERVOIR, SAID CONDUIT MEANS HAVING AN OIL-PASSAGE VALVE LOCATED THEREIN WHICH VALVE IS PERIODICALLY OPENED BY THE PRESSURE MINIMA OCCURRING IN THE AIR CUSHION FOR PERMITTING TRANSPORT OF OIL FROM THE OIL RESERVOIR INTO THE AIR CUSHION.