DRILL BIT AND METHOD FOR PRODUCING A DRILL BIT

• US 20090222009A1
• Filed: 10/01/2008
• Published: 09/03/2009
• Est. Priority Date: 08/08/2002
• Status: Active Grant

• Current Assignee: Surgibit IP Holdings Pty Limited (Orthopedic Innovation Pty Limited)
• Original Assignee: Surgibit IP Holdings Pty Limited (Orthopedic Innovation Pty Limited)
• Inventors: Ellis, Liam Patrick
• Granted Patent: US 8,172,845 B2
• Time in Patent Office: Days
• US Class Current: 606/80
• CPC Class Codes: A61B 17/1615 Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
• CPC Class Codes: B23B 51/00 Tools for drilling machines
• CPC Class Codes: B23B 51/02 Twist drills
• CPC Class Codes: Y10T 408/89 Tool or Tool with support
• CPC Class Codes: Y10T 408/907 including detailed shank

Abstract

A drill bit including a shaft which has a pyramidal shaped end defining a drill tip with a plurality of edges defining the pyramidal shape.

One or more recesses are provided for directing away debris produced whilst drilling, the at least one recess having a first portion extending along the shaft and a second portion having a first portion extending along the shaft and a second portion which extends along the drill tip; wherein the. The second portion which extends along the drill tip. The second portion of the at least one recess extends along an edge of the drill tip.

Claims

1-27. -27. (canceled)

28. A drill bit comprising:

a shaft comprised of two parts;

(1) a pyramidal shaped end portion defining a drill tip and having a plurality of cutting edges; and

(2) a shank portion;

a plurality of recesses for directing away debris produced while drilling, each said recess having two portions;

(1) a first portion extending along said shank portion; and

(2) a second portion formed in said end portion, said second portion extending along each said cutting edge of said end portion.

29. A drill bit as claimed in claim 28, wherein said recess defines the cutting edge.

30. A drill bit as claimed in claim 28, wherein the depth of the second portion of each said recess varies along a length thereof relative to a surface of the drill tip so that the cutting ability of the edge adjacent to the point of the drill bit is less than the cutting ability of the edge adjacent to the shaft.

31. A drill bit as claimed in claim 28, wherein the first portion of said each recess is substantially helical in shape.

33. A drill bit as claimed in claim 28, wherein the end portion defining the faces which define the pyramidal shape of the drill tip.

34. A drill bit as claimed in claim 33, wherein said three faces extend between three edges, each of said faces being flat.

35. A drill bit as claimed in claim 34, wherein said second portion of each said recess extends along a respective one of said faces.