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US 5,400,546 AGranted
Precision twist drill sharpener/point splitting machine
AssigneeDarex, LLC
InventorsWilliam C. Christian, David A. Bernard
Life of this patent
Estimating the term…
Abstract
A twist drill sharpener employing a pair of rotary grinding wheels has three primary drill chuck receiving openings, one for alignment of the twist drill and cams on the twist drill chuck; a second receptacle for grinding the end of a chucked twist drill; and a third receptacle which receives the drill and chuck for grinding a split point on the sharpened twist drill.
Claims6
A twist drill sharpener, comprising a housing mounting;
- a motor having a horizontal motor-driven spindle;
- a grinding wheel made of metal, mounted for rotation on the spindle, said grinding wheel having a beveled peripheral grinding surface;
- a twist drill mounting chuck having a cylindrical barrel portion;
- a pair of peripheral cams carried by the barrel portion of the chuck, said housing defining at least two chuck receiving fixtures, said at least two fixtures including a first fixture for positioning a twist drill flute relative to one of the cams and positioning the end of the twist drill a fixed longitudinal distance from at least one of the two cams;
- a second fixture, said second fixture having a chuck receiving opening therein to position the chuck and twist drill in operative relation to the beveled grinding surface of said grinding wheel, further including a third fixture having an opening therein to receive the chuck and twist drill, said third fixture mounting said chuck and twist drill, tangential to a grinding surface on the grinding wheel, further wherein the grinding wheel associated with the third fixture has a peripheral grinding surface, wherein the first fixture includes a pusher rod for determining the longitudinal distance between the end of the twist drill and at least one of the chuck mounted cams.
2 more elements
A twist drill sharpener, comprising a housing mounting;
- a motor having a horizontal motor-driven spindle;
- a grinding wheel made of metal mounted for rotation on the spindle, said grinding wheel having a beveled peripheral grinding surface;
- a twist drill mounting chuck having a cylindrical barrel portion;
- a pair of peripheral cams carried by the barrel portion of the chuck, said housing defining at least two chuck receiving fixtures, said at least two fixtures including a first fixture for positioning a twist drill flute relative to one of the cams and positioning the end of the twist drill a fixed longitudinal distance from at least one of the two cams;
- a second fixture, said second fixture having a chuck receiving opening therein to position the chuck and twist drill in operative relation to the beveled grinding surface of said grinding wheel, wherein the second chuck receiving fixture is associated with a pair of cam followers adapted to engage the pair of cams carried by the barrel portion of the chuck, and wherein one of the cam followers urges the twist drill toward and away from the grinding surface of the grinding wheel, and the other of the cam followers urges the chuck mounted twist drill in a direction normal to the axis of rotation of the grinding wheel, and wherein the second receptacle is supported by a pair of leaf springs which permit transverse movement of the chuck as one of the cam followers engages one of the chuck mounted cams.
2 more elements
Dependencies are inferred from the claim text.