Pipe hole cutter and method

Claim 1

APPARATUS FOR CUTTING A HOLE IN THE SIDE WALL OF A CONCRETE PIPE, COMPRISING: A CYLINDRICAL HOUSING; A BRACKET MOUNTED UPON SAID HOUSING AT DIAMETRICALLY OPPOSITE SIDES THEREOF; A PAIR OF CLAMPING ARMS PIVOTALLY CONNECTED AT ONE END THEREOF ON EACH OF SAID BRACKETS FOR MOUNTING SAID HOUSING UPON SAID PIPE; A ROLLER CARRIED BY THE OTHER END OF EACH CLAMPING ARM AND ENGAGEABLE WITH SAID PIPE; ONE-WAY BRAKE MEANS ENGAGING EACH ROLLER; A LEVER CONNECTED WITH THE PIVOTED END OF EACH CLAMPING ARM; A SWIVEL NUT CARRIED BY EACH LEVER; A TURNBUCKLE ROD INTERCONNECTING THE SWIVEL NUTS OF THE LEVERS ASSOCIATED WITH EACH PAIR OF CLAMPING ARMS, EACH TURNBUCKLE ROD HAVING A RIGH-HAND THREAD AT ONE END THEREOF AND A LEAF-HAND THREAD AT THE OTHER END THEREOF AND THE SWIVEL NUTS ASSOCIATED WITH THE THREADED ENDS OF EACH TURNBUCKLE BAR HAVING MATING RIGHT AND LEFT-HAND THREADS, WHEREBY ROTATION OF SAID TURNBUCKLE BARS WILL EFFECT ADJUSTMENT OF SAID CLAMPING ARMS TOWARD OR AWAY FROM A PIPE WHEN DISPOSED THEREBETWEEN; A CYLINDRICAL CUTTER SLEEVE DISPOSED IN SAID HOUSING HAVING TEETH AT ONE END THEREOF ENGAGEABLE WITH SAID PIPE; SAID CUTTER SLEEVE HAVING TWO SETS OF AXIALLY SPACED AND CIRCUMFERENTIALLY STAGGERED OPENINGS EXTENDING THERETHROUGH; ROLLERS CARRIED BY SAID CUTTER SLEEVE CONONE ROLLER EXTENDING THROUGH EACH OF SAID OPENINGS AND ENGAGING SAID HOUSING TO POSITION SAID CUTTER SLEEVE CONCENTRICALLY IN SAID HOUSING; A MANDREL CONNECTED WITH SAID CUTTER SLEEVE AND EXTENDING UPWARDLY THEREFROM; A MOTOR CONNECTED WITH SAID MANDREL FOR ROTATING SAID CUTTER SLEEVE; A BRACKET CONNECTED WITH SAID LEVERS IN A REGION ABOVE SAID SWIVEL NUTS; ADJUSTABLE MEANS CARRIED BY SAID BRACKET AND ENGAGEABLE WITH SAID MOTOR FOR URGING SAID MOTOR AND CUTTER SLEEVE IN A DIRECTION AWAY FROM SAID BRACKET TO ENGAGE THE TEETH OF SAID CUTTER SLEEVE WITH A PIPE; A SPINDLE MOUNTED AXIALLY WITHIN SAID CUTTER SLEEVE; A TUBULAR MEMBER MOUNTED ON SAID SPNDLE FOR AXIAL AND ROTARY MOVEMENT RELATIVE THERETO; AND A MAGNET CARRIED BY SAID TUBULAR MEMBER.