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US 6,890,133 B2Granted
Stepped drill bit having split tip
AssigneeIrwin Industrial Tool Company
InventorsIqbal Singh, Harley Schuerman
Life of this patent
Estimating the term…
Abstract
A drill bit is disclosed having a cutting portion having a plurality of axially aligned, graduated cutting members. Each of the members has cutting edges defined by a single slot extending therethrough. A tip portion at one end of the cutting portion defines at least a pair of cutouts therein, wherein one of the cutouts is aligned with the slot.
Claims28
A drill bit comprising:
- an elongated shaft extending along an axis, said shaft defining a bit holding portion;
- a drilling portion located adjacent said shaft, said drilling portion including a generally conical tip portion opposite said bit holding portion and a plurality of stepped shoulders concentrically aligned along said axis, each of said stepped shoulders having an outer diameter that is larger than the next adjacent ledge toward said tip portion;
- a first V-shaped slot defined in said tip portion and said drilling portion, said first slot extending generally axially toward said bit holding portion;
- and
- a second V-shaped slot defined in said tip portion apart from said first slot, wherein said second V-shaped slot does not extend the entire length of said drilling portion.
2 more elements
A method of forming a sized opening in a workpiece, said method comprising the steps of:
- providing a drill bit comprising a generally conical drilling portion defining a plurality of concentric cutting members and a single groove extending along said drilling portion, said drill bit including a tip portion defining a plurality of flutes;
- drilling a first opening using said plurality of flutes of said tip portion;
- and
- drilling a sized opening larger than said first opening using one of said plurality of cutting members.
1 more element
A drill bit comprising:
- a cutting portion having a plurality of axially aligned, graduated cutting members, each of said members having cutting edges defined by a single slot extending through said plurality of graduated cutting members;
- and
- a tip portion at one end of said cutting portion having at least two V-shaped cutouts therein, wherein one of said V-shaped cutouts is aligned with said single slot.
A method of forming a sized opening in a workpiece, said method comprising the steps of:
- providing a drill bit comprising:
- a graduated, generally conical cutting portion having cutting members of increasing diameter extending from a tip portion;
- a first V-shaped slot defined in said tip portion, said slot extending generally axially through a plurality of said cutting members;
- and
- a second V-shaped slot defined in said tip portion apart from said first slot, wherein said second V-shaped slot does not extend through all of said cutting members;
- drilling a first opening having a first diameter using said drill bit;
- and
- drilling a second opening having a second diameter larger than said first diameter using said drill bit.
5 more elements
A drill bit comprising:
- a stepped drilling portion defining a generally conical shape;
- a single elongated slot extending along said stepped drilling portion;
- and
- a tip portion defined on a distal end of said drilling portion and extending therefrom, said tip portion defining a plurality of slots each defining a cutting edge;
- wherein one of said plurality of slots is generally aligned with said elongated slot.
2 more elements
A drill bit comprising:
- an elongated drilling portion having a plurality of adjacent cylinders of increasing diameter extending from a tip portion, first V-shaped slot defined in said tip portion, said slot extending generally through said plurality of adjacent cylinders alone an axis:
- and
- a second V-shaped slot defined in said tip portion, apart from said first slot, wherein said second V-shaped slot does not extend the entire length of said drilling portion.
A drill bit comprising:
- an elongated shaft having a drilling portion and a mounting portion;
- said drilling portion having a graduated set of annular culling members extending concentrically along an axis from a tip portion toward said mounting portion, each of said culling members having a sector cutout aligned together along said axis;
- said tip portion defining a first sector tip cutout extending axially therethrough and aligning with said sector cutouts of said cutting members and a second sector tip cutout extending therethrough that does not align with said sector cutouts of said culling members.
A drill bit comprising:
- an elongated drilling portion having a first end and a second end, said drilling portion defining a graduated set of stepped annular cutting members extending concentrically along an axis and increasing in radial size from said first end toward said second end;
- a single elongated slot extending along said drilling portion between said first end and said second end;
- and
- a tip portion defined on said first end, said tip portion defining a plurality of flutes.
1 more element
Dependencies are inferred from the claim text.