Apparatus for boring metal plates

Claim 1

IN A MECHANISM OF THE CHARACTER DESCRIBED; COMPRISING IN COMBINATION A PLURALITY OF BORING HEADS, EACH BORING HEAD HAVING A MULTITUDE OF BORING TOOLS, A SHUTTLE BLOCK, RAIL MEANS TO SLIDEABLY SUPPORT SAID SHUTTLE BLOCK RELATIVE TO THE BORING HEADS, CLAMPING MEANS TO SECURE A WORK PLATE ON SAID SHUTTLE BLOCK, TRACK MEANS MOUNTED BELOW EACH OF THE BORING HEADS, OPERATOR-OPERATIVE MEANS TO SHIFT THE SHUTTLE BLOCK LATERALLY FROM THE RAIL MEANS ONTO ONE OF SAID TRACK MEANS AND IMMEDIATELY BELOW A SELECTED BORING HEAD, MEANS TO VERTICALLY ADJUST EACH OF SAID BORING HEADS RELATIVE TO SAID SHUTTLE BLOCK, EACH OF THE BORING HEADS HAVING A PAIR OF GUIDE PINS PROJECTING THEREFROM, MEANS CARRIED BY THE SHUTTLE BLOCK AND ARRANGED TO COOPERATE WITH THE GUIDE PINS TO EFFECT A PRECISION ALIGNMENT OF THE SHUTTLE BLOCK WITH ANY ONE OF THE BORING HEADS UPON SAID BORING HEAD BEING LOWERED RELATIVE TO THE SHUTTLE BLOCK SO AS TO THEREBY DETERMINE THE POSITION OF THE BORING TOOLS OF SUCH BORING HEAD TO THE WORK PLATE, OIL SUPPLY MEANS CARRIED BY EACH OF THE BORING HEADS, PASSAGEWAY MEANS IN EACH OF THE BORING HEADS FOR CONDUCTING OIL FROM THE SUPPLY MEANS TO BE MULTITUDE OF BORING TOOLS, AND MEANS CARRIED BY THE MOVABLE SHUTTLE BLOCK AND SURROUNDING THE WORK PLATE FOR COLLECTING OIL DRIPPINGS FROM THE BORING TOOLS SO AS TO MAINTAIN THE WORK PLATE IMMERSED IN THE OIL THEREFROM DURING THE BORING OPERATION.