US4047826A — Drill having indexable replaceable insert tip

Claim 1

Independent Claim 291 words

A drill for forming holes in metal with a high degree of precision, comprising: a shank portion and an elongate, cylindrical body portion, having a passage extending axially therethrough, said body portion further having an axial slot in one end thereof, said slot having a bottom surface which extends perpendicularly to the axis of the body; a threaded screw extending across said slot and across the longitudinal axis of the body for drawing the sides of the slot together; a replaceable insert disposed in said slot and being indexable about said fastening means, said insert having a pair of parallel planar opposed faces, a pair of opposed ends, at least one of said ends having two angularly displaced cutting lips each lying at a lip relief angle to one of said faces, said insert further having a pair of opposed side edges extending between said opposed ends, said side edges being configured to provide non-interfering clearance with the walls of a hole formed by said cutting lips; said passage having a diameter greater than the thickness of the insert and extending into said slot for conducting coolant along both sides of the insert to at least the center thereof; and seating means comprising a separable, planar anvil having lateral edges and a first, substantially straight edge adapted to seat in the bottom of said slot; a locating tang projecting from said straight edge for engaging said axial passage, and a generally V-shaped indented edge opposite said flat edge forming a recess for receiving one of said opposed ends of said insert, the lateral edges of said anvil protruding from either side of said drill body to substantially equal the width of said insert to comprise wear pads for stabilizing the drill.

Claim 2

Dependent Claim 291 words

A drill for forming holes in metal with a high degree of precision, comprising: a shank portion and an elongate, cylindrical body portion, having a passage extending axially therethrough, said body portion further having an axial slot in one end thereof, said slot having a bottom surface which extends perpendicularly to the axis of the body; a threaded screw extending across said slot and across the longitudinal axis of the body for drawing the sides of the slot together; a replaceable insert disposed in said slot and being indexable about said fastening means, said insert having a pair of parallel planar opposed faces, a pair of opposed ends, at least one of said ends having two angularly displaced cutting lips each lying at a lip relief angle to one of said faces, said insert further having a pair of opposed side edges extending between said opposed ends, said side edges being configured to provide non-interfering clearance with the walls of a hole formed by said cutting lips; said passage having a diameter greater than the thickness of the insert and extending into said slot for conducting coolant along both sides of the insert to at least the center thereof; and seating means comprising a separable, planar anvil having lateral edges and a first, substantially straight edge adapted to seat in the bottom of said slot; a locating tang projecting from said straight edge for engaging said axial passage, and a generally V-shaped indented edge opposite said flat edge forming a recess for receiving one of said opposed ends of said insert, the lateral edges of said anvil protruding from either side of said drill body to substantially equal the width of said insert to comprise wear pads for stabilizing the drill.

Claim 3

Dependent Claim 42 words

A drill according to claim 1, wherein as least one face of said insert is provided with a groove extending from the center thereof to at least one of said cutting lips for conducting a flow of coolant to said cutting lips.

Claim 4

Dependent Claim 234 words

A precision metal drill having an indexable insert forming the cutting tip thereof, comprising: an elongate body having a shank at one end and at the other end thereof an axially-extending slot terminating in a substantially flat bottom oriented transversely to the drill body; fastening means engaging the portions of said body lying on either side of said slot for drawing said portions toward one another; a passage extending generally axially through the length of said drill body, said passage having a diameter greater than the width of said slot; seating means disposed in the bottom of said slot and comprising a generally planar member having: a first, substantially straight edge seating in the bottom of a slot; a pair of lateral edges extending generally perpendicularly to said first edge; a locating tang extending from said edge and engaging said axial passage; and a V-shaped edge opposite said straight edge for snugly receiving thereagainst two of the edges of the insert; and a generally hexagonal indexable insert disposed in said slot, and having two opposed pairs of cutting edges, two of said cutting edges seating in said V-shaped recess, said insert having a generally centrally-located aperture for allowing the passage of said fastening means therethrough; said insert including at least one groove formed in the surface thereof and extending from said aperture to one of the cutting edges for conducting coolant to said edge.

Claim 5

Dependent Claim 234 words

A precision metal drill having an indexable insert forming the cutting tip thereof, comprising: an elongate body having a shank at one end and at the other end thereof an axially-extending slot terminating in a substantially flat bottom oriented transversely to the drill body; fastening means engaging the portions of said body lying on either side of said slot for drawing said portions toward one another; a passage extending generally axially through the length of said drill body, said passage having a diameter greater than the width of said slot; seating means disposed in the bottom of said slot and comprising a generally planar member having: a first, substantially straight edge seating in the bottom of a slot; a pair of lateral edges extending generally perpendicularly to said first edge; a locating tang extending from said edge and engaging said axial passage; and a V-shaped edge opposite said straight edge for snugly receiving thereagainst two of the edges of the insert; and a generally hexagonal indexable insert disposed in said slot, and having two opposed pairs of cutting edges, two of said cutting edges seating in said V-shaped recess, said insert having a generally centrally-located aperture for allowing the passage of said fastening means therethrough; said insert including at least one groove formed in the surface thereof and extending from said aperture to one of the cutting edges for conducting coolant to said edge.

Claim 6

Dependent Claim 45 words

A drill according to claim 3, wherein said lateral edges extend outwardly from said slot and are spaced by a width substantially equal to the width of said insert, whereby said lateral edges encounter the inner surface of a hole being drilled by said insert.

Claim 7

Dependent Claim 14 words

A drill according to claim 4, wherein said lateral edges are cylindrical in form.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-09-12	1981-03-14	1981-09-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-09-12	1985-03-14	1985-09-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-09-12	1989-03-14	1989-09-13	$7700.00	Window Closed / Lapsed

Drill having indexable replaceable insert tip

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag