Drill sharpener

Claim 2

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped concave conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of different sized, spaced longitudinal passaGes therethrough having their longitudinal axes generally parallel to one another and to said central axis and aligned with said conical surface, and means on said body engageable with at least one flute of drill bits positioned in said passages and of a dimension to substantially engage opposite sides of said flute and stationarily position said bit during sharpening, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface.

Claim 3

A drill sharpener as defined in claim 1 wherein said means is adjustable relative to said body, whereby to angularly adjust said bit cutting land relative to said abrasive wheel surface.

Claim 4

A drill sharpener as defined in claim 1 wherein said means comprises a plate having a plurality of apertures aligned with said passages, said plate having a projection extending into each said aperture and adapted to fit into said flute.

Claim 5

A drill sharpener as defined in claim 1 which includes shaft means fixed to said wheel and rotatably supported upon said body, means for attaching said shaft means to a rotary drive, and means restraining said body against rotation.

Claim 6

A drill sharpener including a stationary body, a conical shaped abrasive wheel supported adjacent said body and rotatable about a central axis, said body having a plurality of different sized, angularly spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, a plate between said body and said wheel and supported upon said body, said plate having a plurality of apertures aligned with respective ones of said passages, said plate having one projection extending into each said aperture and adapted to fit into a flute of a drill bit located in a respective one of said passages and apertures, whereby to position a cutting land of each of said bits relative to said conical surface, said plate being angularly adjustable about said axis, whereby to angularly reposition said cutting land of each of said bits relative to said conical surface.

Claim 7

A drill sharpener including a stationary body, a conical shaped abrasive wheel supported adjacent said body and rotatable about a central axis, said body having a plurality of different sized, angularly spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, a plate between said body and said wheel and supported upon said body, said plate having a plurality of apertures aligned with respective ones of said passages, said plate having one projection extending into each said aperture and adapted to fit into a flute of a drill bit located in a respective one of said passages and apertures, whereby to position a cutting land of each of said bits relative to said conical surface, said plate being angularly adjustable about said axis, whereby to angularly reposition said cutting land of each of said bits relative to said conical surface.

Claim 8

A drill sharpener comprising a stationary body, an abrasive wheel rotatably supported adjacent said body for rotation about a central axis and having a cupped concave conical surface facing said body, passage means defined by said body aligned with said conical surface and parallel to said axis and adapted to receive selective drill bits for sharpening by said abrasive wheel, and means on said body adjacent said abrasive wheel receivable in one of the flutes of the drill bit located in said passage means to angularly locate one cutting land of said bit for sharpening by the conical surface of said abrasive wheel, said angular locating means being adjustable relative to said body to compensate for manufacturing and wear differences in said bits.

Claim 9

A drill sharpener comprising a stationary body, an abrasive wheel rotatably supported adjacent said body for rotation about a central axis and having a cupped concave conical surface facing said body, passage means defined by said body aligned with said conical surface and parallel to said axis and adapted to receive selective drill bits for sharpening by said abrasive wheel, and means on said body adjacent said abrasive wheel receivable in one of the flutes of the drill bit located in said passage means to angularly locate one cutting land of said bit for sharpening by the conical surface of said abrasive wheel, said angular locating means being adjustable relative to said body to compensate for manufacturing and wear differences in said bits.

Claim 10

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of different sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, and means on said body engageable with at least one flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, said flute engaging means being adjustable relative to said body, whereby to angularly adjust said bit cutting land relative to said abrasive wheel surface, and cam means supported upon said body and engageable with said adjustable means.

Claim 11

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of different sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, and means on said body engageable with at least one flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, said flute engaging means being adjustable relative to said body, whereby to angularly adjust said bit cutting land relative to said abrasive wheel surface, and cam means supported upon said body and engageable with said adjustable means.

Claim 12

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of diffeRent sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, a plate on said body and having a plurality of apertures aligned with said passages, said plate having a projection overlaying each said aperture and adapted to fit into a flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, said plate being angularly shiftable substantially about the axis of said wheel, a rotatable cam supported by said body and cooperable with cam follower means on said plate whereby to angularly shift said plate relative to said body.

Claim 13

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of diffeRent sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, a plate on said body and having a plurality of apertures aligned with said passages, said plate having a projection overlaying each said aperture and adapted to fit into a flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, said plate being angularly shiftable substantially about the axis of said wheel, a rotatable cam supported by said body and cooperable with cam follower means on said plate whereby to angularly shift said plate relative to said body.

Claim 14

A drill sharpener as defined in claim 8 wherein said plate includes a tab portion having an opening therein, said rotatable cam extending through said opening.

Claim 15

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of different sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, and means on said body engageable with at least one flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, a plate disposed atop said body and having apertures aligned with but smaller than said passages, means for angularly shifting said plate relative to said body, whereby to angularly incline said bits relative to the axis of said wheel.

Claim 16

A drill sharpener including a stationary body, an abrasive wheel supported adjacent said body and rotatable about a central axis, said wheel having a cupped conical surface symmetrical with its rotational axis and facing said body, said body having a plurality of different sized, spaced passages therethrough generally parallel to one another and to said axis and aligned with said conical surface, and means on said body engageable with at least one flute of drill bits positioned in said passages, whereby to substantially prevent rotation of and accurately position a cutting land of each of said bits relative to said abrasive wheel surface, a plate disposed atop said body and having apertures aligned with but smaller than said passages, means for angularly shifting said plate relative to said body, whereby to angularly incline said bits relative to the axis of said wheel.

Claim 17

A drill sharpener attachment comprising a body, an abrasive wheel rotatably supported by shaft means upon said body for rotation about a central axis, means restraining said wheel against axial movement relative to said body, said wheel having a conical surface facing said body, a plurality of openings extending through said body parallel to said axis and aligned with said conical surface, said shaft means including means attachable to a separate power unit whereby to rotate said wheel, means on said body operable to prevent rotation of said body, a plate supported upon said body and having apertures therein aligned with respective ones of said openings, said plate having projections extending into alignment with respective ones of said openings and engageable with at least one flute of drill bits positioned in said openings, whereby to position a cutting land of said bit angularly relative to the conical surface of said wheel, said plate being angularly shiftable substantially about the axis of said wheel, whereby to angularly shift the position of said cutting land relative to the conical surface of said wheel.

Claim 18

A drill sharpener attachment comprising a body, an abrasive wheel rotatably supported by shaft means upon said body for rotation about a central axis, means restraining said wheel against axial movement relative to said body, said wheel having a conical surface facing said body, a plurality of openings extending through said body parallel to said axis and aligned with said conical surface, said shaft means including means attachable to a separate power unit whereby to rotate said wheel, means on said body operable to prevent rotation of said body, a plate supported upon said body and having apertures therein aligned with respective ones of said openings, said plate having projections extending into alignment with respective ones of said openings and engageable with at least one flute of drill bits positioned in said openings, whereby to position a cutting land of said bit angularly relative to the conical surface of said wheel, said plate being angularly shiftable substantially about the axis of said wheel, whereby to angularly shift the position of said cutting land relative to the conical surface of said wheel.

Claim 19

An attachment as defined in claim 11 which includes a cam supported upon said body and engageable with said plate.

Claim 20

In a drill bit sharpener, the combination of an abrasive wheel rotatably driven about its axis, a body axially of the wheel and substantially concentric therewith, the body having means therein for selectively receiving drill bits of different diameter and generally guiding the same into engagement with the wheel, indexing means between the body and the wheel, said indexing means including means for preventing substantial rotation of and thereby properly positioning respective drill bits with respect to the wheel, and means for adjusting said indexing means circumferentially about the axis of the wheel, thereby accommodating tolerance accumulations and facilitating the sharpening of drill bits of various design and manufacture.

Claim 21

In a drill bit sharpener, the combination of an abrasive wheel rotatably driven about its axis, a body axially of the wheel and substantially concentric therewith, the body having means therein for selectively receiving drill bits of different diameter and generally guiding the same into engagement with the wheel, indexing means between the body and the wheel, said indexing means including means for preventing substantial rotation of and thereby properly positioning respective drill bits with respect to the wheel, and means for adjusting said indexing means circumferentially about the axis of the wheel, thereby accommodating tolerance accumulations and facilitating the sharpening of drill bits of various design and manufacture.

Claim 22

In a drill bit sharpener, the combination of an abrasive wheel rotatably driven about its axis, a body axially of the wheel and substantially concentric therewith, the body having a plurality of longitudinal through bores for selectively receIving drill bits of different diameter and generally guiding the same into engagement with the wheel, and a single indexing plate disposed between the body and the wheel, said plate having a plurality of projection means, one for each of said bores, said projection means engaging at least one flute of a respective drill bit and thereby positioning the bit with respect to the wheel during the sharpening operation.

Claim 23

In a drill bit sharpener, the combination of an abrasive wheel rotatably driven about its axis, a body axially of the wheel and substantially concentric therewith, the body having a plurality of longitudinal through bores for selectively receIving drill bits of different diameter and generally guiding the same into engagement with the wheel, and a single indexing plate disposed between the body and the wheel, said plate having a plurality of projection means, one for each of said bores, said projection means engaging at least one flute of a respective drill bit and thereby positioning the bit with respect to the wheel during the sharpening operation.

Claim 24

A drill sharpener comprising a stand-up housing having an electric motor therein, a shaft driven by said motor and extending upwardly of said housing, a sharpener head supported upon said housing, a sharpening wheel in said head and coupled to said shaft, said head including a plurality of spaced, vertically disposed openings therein aligned with said wheel, said openings having different diameters to receive drill bits of corresponding diameters for sharpening by said wheel, and unitary indexing means separate from said head and having flute engaging means adjacent each of said openings and said sharpening wheel and cooperable with at least one flute of said drill bits when the latter is in position in said openings, whereby to angularly position said drill bit for sharpening by said wheel.

Claim 25

A drill sharpener comprising a stand-up housing having an electric motor therein, a shaft driven by said motor and extending upwardly of said housing, a sharpener head supported upon said housing, a sharpening wheel in said head and coupled to said shaft, said head including a plurality of spaced, vertically disposed openings therein aligned with said wheel, said openings having different diameters to receive drill bits of corresponding diameters for sharpening by said wheel, and unitary indexing means separate from said head and having flute engaging means adjacent each of said openings and said sharpening wheel and cooperable with at least one flute of said drill bits when the latter is in position in said openings, whereby to angularly position said drill bit for sharpening by said wheel.

Claim 26

A drill sharpener as defined in claim 15 wherein said indexing means comprises a plate supported on said head and angularly adjustable relative thereto, said plate having openings generally aligned with said openings in said head, said plate having at least one projection extending into each opening therein and adapted to engage said at least one flute of drill bits positioned in said head openings.