Drill guide

Claim 1

A drill guide comprising a rigid block having flat top and bottom surfaces, the bottom surface being larger than the top surface and a peripheral edge surface sloping downwardly from the top surface to the bottom and intersecting the bottom surface at an acute angle, said block containing a plurality of vertically disposed smooth bore holes extending from the top surface to the bottom surface, said holes being located adjacent the edge face surface and of a diameter corresponding to the diameters of the drill bits of the standard set of drill bits, gauge lines on the sloping edge surface of the block extending from the line of intersection of the sloping surface with the bottom surface continuously up the sloping surface, projections of said lines on the top surface intersecting each other at the geometric centers of the holes and at right angles such that the center of each hole is represented by two right angular disposed gauge lines on the sloping surface of the block which enables centering the holes on the work to be drilled, said block containing a geometrically centered vertically disposed threaded hole from its top surface to its bottom surface, an elongate rigid handle having at one end a vertically disposed smooth bore hole, a thumb screw extending through the smooth bore hole in the end of the handle into the threaded hole in the block for binding the block to the handle with the handle positioned at any desired angular position about a vertical axis coinciding with the axis of the thumb screw, said handle extending radially from the geometric center of the block and a flat bearing surface at the other end of the handle lying in a common plane with the bottom surface of the block for supporting the block in a fixed position relative to the surface to be drilled, said handle having a portion intermEdiate its ends upwardly offset from the plane of the bottom surfaces of the block and the bearing surface providing a hand grip for gripping the guide and holding it in a fixed position during drilling operations.