Conduit forming machine with dowel pin hole former

Claim 1

IN A CONDUIT FORMING MACHINE OF THE TYPE HAVING A FRAME, A FORM SUPPORT THEREON, A FORM ON SAID SUPPORT HAVING ENDS WITH ALIGNED OPENINGS THEREIN IN POSITIONS REGISTERING WITH THE ENDS OF A DUCT TO BE FORMED IN A CONDUIT IN SAID FORM, A PACKER HEAD, A PACKER HEAD SUPPORTING SAID DRIVING SHAFT CARRYING SAID HEAD, AND MEANS ON THE FRAME AND ENDWISE FROM SAID FORM FOR ROTATABLY AND LONGITUDINALLY SLIDABLY MOUNTED SAID SHAFT ON SAID FRAME IN AXIAL ALIGNMENT WITH SAID OPENINGS IN ONE ENDWISE DIRECTION FROM SAID FORM, SAID SLIDABLE MOUNTING MEANS PROVIDING LIMITS FOR SLIDING MOVEMENT OF SAID SHAFT GREAT ENOUGH TO PERMIT MOVEMENT OF SAID HEAD THROUGH SAID FORM FROM ONE END TO THE OTHER AND OUT OF SAID FORM THROUGH THE OPENING IN ONE END OF SAID FORM, AND DRIVING MEANS INCLUDING MEANS FOR ROTATING SAID SHAFT AND HEAD AND MEANS FOR SIMULTANEOUSLY SLIDING SAID SHAFT TO MOVE SAID HEAD LONGITUDINALLY THROUGH AND OUT OF SAID FORM, THE IMPROVEMENT WHICH COMPRISES OPPOSED DOWEL HOLE FORMING PINS, GUIDE MEANS ON THE FRAME SPACED FROM AND OPPOSED TO THE OPPOSITE ENDS OF SAID FORM AND SLIDABLY SUPPORTING SAID PINS WITH THEIR AXES PARALLEL TO THE AXIS OF SAID SHAFT FOR AXIAL MOVEMENT INTO AND FROM SAID FORM THROUGH THE OPPOSITE ENDS THEREOF RESPECTIVELY BETWEEN POSITIONS EXTENDING INTO SAID FORM THROUGH SAID RESPECTIVE ENDS AND POSITIONS OUTSIDE AND CLEAR OF SAID FORM, MEANS INTERCONNECTING SAID OPPOSED PINS FOR MOVING ONE IN ONE AXIAL DIRECTION UPON MOVEMENT OF THE OTHER IN THE OPPOSITE DIRECTION, AND A LOST