GB241638A - Improvements in or relating to drilling machines - Google Patents

Abstract

241,638. Parsons, W. H. July 28, 1924. Drilling-machines.-In a drilling- machine having one or more drills rotatably mounted in a slide or slides automatically fed by cam means, the work being automatically indexed and the machine continuing to act automatically until it is stopped, the drill-spindles are driven by a shaft parallel to themselves and geared to spurwheels splined thereon. As applied to a machine for drilling wheel-hubs 22, the opposed spindles 1, 1<a> are mounted in ball-bearing heads 2 reciprocated on guides 3 by cams mounted on a shaft worm-driven at 12 from the main shaft 8, which is rotated by fast and loose pulleys 9. The spindle 1<a> is driven by three gear-wheels 6 from the main shaft and the spindle 1 is similarly driven in the reverse direction by four wheels in a casing 16. The work 22 is mounted on a mandrel supported between a spring poppit 23, locked by a screw 25, and a flat-ended spindle 24 which engages a groove in the mandrel and carries an index-disc 27 i intermittently rotated by a pawl 29 reciprocated by a cam on the cam-shaft and engaging peripheral notches in the disc. A spring plunger also engages the notches to position the work: for each hole. Jigs.-The drill on the spindle 1 passes through holes in the index-disc 27 and the other drill is guided by a hole in a fixed member 36.