Stepped drill bit having split tip
DCFirst Claim
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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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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.
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Citations
28 Claims
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1. A drill bit comprising:
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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. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11)
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3. A method of forming a sized opening in a workpiece, said method comprising the steps of:
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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.
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12. A drill bit comprising:
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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.
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13. A method of forming a sized opening in a workpiece, said method comprising the steps of:
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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.
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14. A drill bit comprising:
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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.
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15. A drill bit comprising:
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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. - View Dependent Claims (16, 17, 18)
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19. A drill bit comprising:
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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. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A drill bit comprising:
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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. - View Dependent Claims (26, 27, 28)
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Specification