Stepped drill bit having split tip

  • US 6,890,133 B2
  • Filed: 10/18/2002
  • Issued: 05/10/2005
  • Est. Priority Date: 10/18/2002
  • Status: Active Grant
First Claim
Patent Images

1. 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.

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