Valve guide reboring device

Claim 1

APPARATUS FOR USE IN COMBINATION WITH A DRILL PRESS IN THE RECONDITIONING OF VALVE GUIDES IN THE CYLINDER HEADS OF INTERNAL COMBUSTION ENGINES; SAID DRILL PRESS HAVING A TABLE, A COLUMN, AND A ROTATABLE SPINDLE AND CHUCK SUPPORTED BY SAID COLUMN AND CAPABLE OF MOVEMENT IN A DIRECTION PERPENDICULAR TO AND IN OPERATIVE RELATIONSHIP WITH SAID TABLE, SAID CYLINDER HEADS BEING OF THE TYPE HAVING VALVE SEATS AND VALVE SPRING SEATS ASSOCIATED WITH THE VALVE GUIDES, SAID VALVE SPRING SEATS SURROUNDING THE VALVE GUIDES ON THE SIDES OF THE CYLINDER HEAD OPPOSITE THE VALVE SEATS, THE SURFACES OF SAID SPRING SEATS BEING PERPENDICULAR TO THE AXES OF THE VALVE GUIDES, AND THE AXES OF SAID VALVE GUIDES BEING PARALLEL TO AND IN THE SAME PLANE WITH EACH OTHER; SAID APPARATUS COMPRISING JIGS FOR SUPPORTING AND ALIGNING A CYLINDER HEAD ON THE TABLE OF SAID DRILL PRESS, EACH OF SAID JIGS INCLUDING; AN UPPER END SURFACE WHICH IS PERPENDICULAR TO THE AXIS OF SAID SPINDLE WHEN SAID JIG IS IN POSITION ON SAID TABLE AND WHICH IS ADAPTED TO RECEIVE ONE OF SAID SPRING SEAT SURFACES ON SAID CYLINDER HEAD, A STUD PERPENDICULAR TO SAID UPPER END SURFACE AND ADAPTED TO BE SLIDABLY RECEIVED BY THE VALVE GUIDE ASSOCIATED WITH SAID ONE OF SAID VALVE SPRING SEATS, A VALVE SEAT PLUG HAVING A CENTRAL AXIAL OPENING FOR RECEPTION OF SAID STUD AND HAVING A TAPERED SURFACE ADAPTED TO BE RECEIVED BY THE VALVE SEAT ASSOCIATED WITH SAID ONE OF SAID VALVE GUIDES, AND MEANS WHICH WILL COOPERATE WITH SAID STUD TO CLAMP SAID VALVE SEAT PLUG CENTRALLY IN SAID VALVE SEAT AND CLAMP SAID SPRING SEAT SURFACE AGAINS SAID UPPER END SURFACE WITH THE AXIS OF SAID VALVE GUIDE PARALLEL AND IN THE SAME PLANE TO THE AXIS OF SAID SPINDLE.