Semi-automatic drill press assembly and method of drilling stacked sheets

Claim 2

A FAST ACTION SEMI-AUTOMATIC DRILLING ASSEMBLY COMPRISING A SMOOTH SURFACE WORK SUPPORT, A COMBINED WORK LOCATOR AND CLAMPING MEMBER ADAPTED TO BE SUPPORTED FOR MOVEMENT TOWARD AND AWAY FROM SAID WORK SUPPORT AND HAVING A TAPERING END ADAPTED TO ENTER A COMPLEMENTALLY SHAPED FACING RECESS IN A TEMPLATE SECURED TO THE UPPER SURFACE OF A WORKPIECE TO BE DRILLED AND BEING EFFECTIVE TO FIRST SHIFT THE WORKPIECE ACCURATELY INTO DRILLING POSITION AND THEREAFTER TO CLAMP THE WORKPIECE TO SAID WORK SUPPORT, AND MEANS INCLUDING POWER DRIVEN DRILLING MEANS RESPONSIVE TO THE CLAMPING OF SAID TEMPLATE TO INITIATE OPERATION OF SAID DRILLING MEANS TO DRILL A HOLE IN THE WORKPIECE IN AXIAL ALIGNMENT WITH SAID LOCATOR AND CLAMPING MEMBER.

Claim 3

THAT METHOD OF DRILLING SHEET MATERIAL TO PRODUCE BORES FREE OF BURRS AND ROUGHNESS AT THEIR RIM EDGES WHICH COMPRISES STACKING A PLURALITY OF SIMILAR SHEETS TO BE DRILLED IN CLOSELY COMPACTED SUPERIMPOSED RELATIONS WITH A BACK-UP SHEET AGAINST THE SIDE OF THE STACK REMOTE FROM THE DRILL, SECURING A RIGID TEMPLATE AGAINST THE OUTER FACE OF SAID BACK-UP SHEET TO PROVIDE A UNITARY TEMPLATE AND WORKPIECE ASSEMBLY, COMPRESSING SAID ENTIRE STACK ASSEMBLY AGAINST A FLAT STATIONARY SURFACE UNDER A PRESSURE OF HUNDREDS OF P.S.I. WHILE ADVANCING A DRILL AT HIGH SPEED THROUGH SAID STACK AND INTO SAID BACK-UP SHEET TO A DISTANCE SHORT OF PENETRATION INTO SAID RIGID PLATE TO BORE ALIGNED BORES THROUGH SAID SUPERIMPOSED SHEETS, AND MAINTAINING SAID STACK ASSEMBLY COMPRESSED UNTIL AFTER THE RETRACTION OF THE DRILL.

Claim 4

THAT METHOD OF DRILLING SHEET MATERIAL TO PRODUCE BORES FREE OF BURRS AND ROUGHNESS AT THEIR RIM EDGES WHICH COMPRISES STACKING A PLURALITY OF SIMILAR SHEETS TO BE DRILLED IN CLOSELY COMPACTED SUPERIMPOSED RELATIONS WITH A BACK-UP SHEET AGAINST THE SIDE OF THE STACK REMOTE FROM THE DRILL, SECURING A RIGID TEMPLATE AGAINST THE OUTER FACE OF SAID BACK-UP SHEET TO PROVIDE A UNITARY TEMPLATE AND WORKPIECE ASSEMBLY, COMPRESSING SAID ENTIRE STACK ASSEMBLY AGAINST A FLAT STATIONARY SURFACE UNDER A PRESSURE OF HUNDREDS OF P.S.I. WHILE ADVANCING A DRILL AT HIGH SPEED THROUGH SAID STACK AND INTO SAID BACK-UP SHEET TO A DISTANCE SHORT OF PENETRATION INTO SAID RIGID PLATE TO BORE ALIGNED BORES THROUGH SAID SUPERIMPOSED SHEETS, AND MAINTAINING SAID STACK ASSEMBLY COMPRESSED UNTIL AFTER THE RETRACTION OF THE DRILL.