Twist drill sharpener and aligning fixture
AssigneeDarex, LLC
InventorsArthur Alexander Bernard, Richard Allen Bernard
Life of this patent
Estimating the term…
Abstract
A twist drill sharpener employing a rotary grinding wheel has a twist drill chuck which mounts a pair of cams which are locked to the chuck when the lips of the twist drill are aligned in an aligning fixture and then the chuck, cams and drill are inserted in a second fixture provided with a pair of cam followers which in conjunction with the chuck carried cams control the grinding of the twist drill.
Claims17
A twist drill sharpener comprising a rotary grinding wheel, a twist drill chuck, said chuck having a cylindrical body, dual drill grinding control cams rotatably mounted on said chuck, and means for locking the dual cams against rotation relative to said chuck, means for aligning the lips of a twist drill to be sharpened with said dual cams, said aligning means including a first fixture adapted to receive the cylindrical body of the chuck, said first fixture including means engaging the said dual cams and a pair of opposed blocks, means mounting each of said opposed blocks for sliding movement toward and away from each other and into engagement with the lips of the chuck supported twist drill and in a plane transverse to the longitudinal axis of the twist drill to be sharpened, a second fixture adapted to rotatably and slidably receive the cylindrical body of the chuck, means mounting said second fixture so that the longitudinal axis of the cylindrical body of the chuck intersects a surface of the grinding wheel and said means including means for angular displacement of the chuck support on a vertical axis relative to the grinding wheel, and first and second cam followers on said second fixture adapted to be engaged by the control cams on said chuck.
A twist drill sharpener including a rotary grinding wheel, a twist drill chuck, and grinding control cams:
- characterized in that the cams are rotatably mounted on the chuck and the chuck includes means for locking the cams against rotation relative to said chuck, and means for aligning the lips of a twist drill to be sharpened with the chuck carried cams, said aligning means including a fixture adapted to receive the chuck and said fixture including means engaging the grinding control cams and further including a pair of opposed blocks, means mounting each of said opposed blocks for sliding movement toward and away from each other and into engagement with the lips of the chuck supported twist drill and in a plane transverse to the longitudinal axis of the twist drill to be sharpened.
A twist drill sharpener comprising a rotary grinding wheel, a twist drill chuck, said chuck having a cylindrical body, dual drill grinding control cams rotatably mounted on said chuck, and means for locking the dual cams against rotation relative to said chuck, means for aligning the lips of a twist drill to be sharpened with said dual cams, said aligning means including a first fixture adapted to receive the cylindrical body of the chuck, said first fixture including means engaging the said dual cams and a pair of opposed blocks slidable into engagement with the lips of the chuck supported twist drill, said slide blocks being rotatably mounted in said first fixture to adjust the aligning means for different drill relief angles, a second fixture adapted to rotatably and slidably receive the cylindrical body of the chuck, means mounting said second fixture so that the longitudinal axis of the cylindrical body of the chuck intersects a surface of the grinding wheel and said means including means for angular displacement of the chuck support on a vertical axis relative to the grinding wheel, and first and second cam followers on said second fixture adapted to be engaged by the control cams on said chuck.
A twist drill sharpener including a rotary grinding wheel, a twist drill chuck, and grinding control cams:
- characterized in that the cams are rotatably mounted on the chuck and the chuck includes means for locking the cams against rotation relative to said chuck, and means for aligning the lips of a twist drill to be sharpened with the chuck carried cams, said aligning means including a fixture adapted to receive the chuck and said fixture including means engaging the grinding control cams and further including a pair of opposed blocks slidable into engagement with the lips of the chuck supported twist drill, wherein the said slide blocks are rotatably mounted in said first fixture to adjust the aligning means for different drill relief angles.
Dependencies are inferred from the claim text.