Boring and breaking hammer with combustion engine or electromotor drive

Claim 1

BORING AND BREAKINGHAMMER INCLUDING A MOTOR, A HOUSING SUPPORTING SAID MOTOR, A DRIVING PISTON CONNECTED TO SAID MOTOR AND A WORKING PISTON MOUNTED IN SAID HOUSING, AND MEANS CONNECTING SAID DRIVING PISTON FOR FORCETRANSMISSION FROM SAID MOTOR TO SAID WORKING PISTON INCLUDING SPRING MEANS COMPRISING A COMPRESSION SPRING SUBJECTED SOLELY TO COMPRESSION OPERATIVE TO RECIPROCATE SAID WORKING PISTON AND DISPOSED TO PERMIT THE TURNING OF SAID WORKING PISTON RELATIVE TO SAID DRIVING PISTON, AND RELEASABLE TURNING MEANS DISPOSED INTERMEDIATE THE LOWER PART OF SAID WORKING PISTON AND SAID HOUSING AND OPERATIVE DURING THE RETURN STROKE OF SAID WORKING PISTON TO EFFECT ROTARY MOVEMENT OF SAID WORKING PISTON RELATIVE TO SAID DRIVING PISTON, SAID DRIVING PISTON AND SAID WORKING PISTON HAVING PORTIONS PRESENTING ABUTMENTS WITHIN SAID WORKING PISTON PROXIMATE THE UPPER AND LOWER END OF SAID SPRING, SAID SPRING MEANS INCLUDING TWO SPRING DISKS ONE INTERMEDIATE EACH END OF SAID SPRING AND THE ADJACENT ABUTMENTS MOVABLE AXIALLY RELATIVE TO SAID DRIVING PISTON AND TO SAID WORKING PISTON AND ALTERNATELY INTO ENGAGEMENT WITH THE ABUTMENTS ON SAID DRIVING PISTON AND THE ABUTMENTS ON SAID WORKING PISTON, SAID TURNING MEANS COMPRISING GROOVES EXTENDING HELICALLY ALONG THE LOWER