Hole milling attachment for machine tools

Claim 1

IN A HOLE MILLING ATTACHMENT FOR MACHINE TOOLS THE COMBINATION OF: A POWER MACHINE TOOL SPINDLE BEARING HOUSING; A FIRST FRAME MEMBER; A HOLLOW CYLINDRICAL PORTION OF SAID FIRST FRAME MEMBER HAVING A BORE FITTED OVER SAID SPINDLE BEARING HOUSING; FIRST MEANS FOR FIXING SAID HOLLOW CYLINDRICAL PORTION ON SAID SPINDLE BEARING HOUSING; A SECOND BORE PORTION OF SAID HOLLOW CYLINDRICAL PORTION, SAID SECOND BORE PORTION AXIALLY ALIGNED WITH SAID FIRST MENTIONED BORE; A SECOND FRAME MEMBER OF SAID ATTACHMENT; A CIRCULAR IN CROSS SECTION PORTION OF SAID SECOND FRAME MEMBER PROJECTING INTO AND CLOSELY ROTATABLY FITTED IN SAID SECOND BORE PORTION; AN ABUTMENT PORTION OF SAID FIRST FRAME NEAR A TERMINUS OF SAID SECOND BORE PORTION; AN ABUTMENT SHOULDER OF SAID SECOND FRAME MEMBER ROTATABLY AND AXIALLY ABUTTED TO SAID ABUTMENT PORTION; RADIAL AND THRUST BEARING MEANS CARRIED AND SUPPORTED WITHIN SAID CIRCULAR IN CROSS SECTION PORTION OF SAID SECOND FRAME; A POWER INPUT SHAFT RADIALLY AND AXIALLY SUPPORTED BY SAID BEARING MEANS; AN EXTENDING END PORTION OF SAID POWER INPUT SHAFT PROJECTING BEYOND SAID BEARING MEANS AND SAID SECOND FRAME MEMBER; ENGAGING AND DRIVING MEANS ROTATABLY MOUNTED IN SAID SPINDLE BEARING HOUSING; SAID ENGAGING AND DRIVING MEANS DRIVINGLY COUPLED TO SAID EXTENDING PORTION OF SAID POWER INPUT SHAFT; A THIRD FRAME MEMBER; A CLAMPING BOLT DISPOSED AXIALLY PARALLEL TO AND SPACED RADIALLY FROM SAID POWER INPUT SHAFT, SAID THIRD FRAME MEMBER PIVOTALLY MOUNTED ON SAID SECOND FRAME MEMBER BY SAID CLAMPING BOLT, SAID CLAMPING BOLT ADAPTED WHEN TIGHTENED TO FIX AND SAID THIRD FRAME MEMBER RELATIVE TO SAID SECOND FRAME MEMBER; IDLER BEARING MEANS CONCENTRICALLY SURROUNDING SAID BOLT; AN IDLER GEAR CONCENTRICALLY ROTATABLY SUPPORTED BY SAID IDLER BEARING MEANS; A POWER INPUT GEAR CARRIED BY SAID POWER INPUT SHAFT, SAID POWER INPUT GEAR MESHING WITH SAID IDLER GEAR; AN OUTPUT SHAFT; BEARING MEANS FOR SAID OUTPUT SHAFT; SAID LAST MENTIONED BEARING MEANS CARRIED BY SAID THIRD FRAME MEMBER; SAID OUTPUT SHAFT BEING AXIALLY PARALLEL WITH SAID BOLT AND SAID POWER INPUT SHAFT, SAID OUTPUT SHAFT BEING RADIALLY SPACED FROM THE AXIS OF SAID BOLT; A THIRD GEAR ON SAID OUTPUT SHAFT AND IN MESH WITH SAID IDLER GEAR; A FIRST RECESS IN SAID SECOND FRAME MEMBER IN WHICH SAID POWER INPUT GEAR IS CONTAINED; A SECOND RECESS IN SAID THIRD FRAME MEMBER IN WHICH SAID THIRD GEAR IS CONTAINED; SAID IDLER GEAR BEING OF AN AXIAL LENGTH TO OVERLAP BOTH SAID FIRST AND SECOND RECESSES AND TO THEREBY MESH WITH BOTH SAID POWER INPUT GEAR AND SAID THIRD GEAR; AND A TOOL HOLDING END PORTION OF SAID OUTPUT SHAFT PROJECTING FROM SAID THIRD FRAME MEMBER.