Core drill bits with enclosed fluid slots
AssigneeLongyear TM, Inc.
InventorsK. Shayne Drivdahl, Michael D. Rupp
Life of this patent
Estimating the term…
Abstract
Core drill bits with long crown heights are described herein. The core drill bits have a series of slots or openings that are not located at the tip of the crown and are therefore enclosed in the body of the crown. The slots may be staggered and/or stepped throughout the crown. As the cutting portion of the drill bit erodes through normal use, the fluid/debris notches at the tip of the bit are eliminated. As the erosion progresses, the slots become exposed and then they function as fluid/debris ways. This configuration allows the crown height to be extended and lengthened without substantially reducing the structural integrity of the drill bit.
Claims20
A drill bit, comprising:
- a crown comprising a hard particulate material infiltrated with cutting media, said crown having:
- a cutting face, an inner surface, and an outer surface;
- at least one notch located within said crown, said at least one notch extending from said inner surface to said outer surface and extending longitudinally from said cutting face into said crown;
- and
- at least one enclosed slot located within said crown, said at least one enclosed slot extending from said inner surface to said outer surface, wherein said at least one enclosed slot has a first opening in said outer surface of said crown and a second opening in said inner surface of said crown, wherein said first opening of said at least one enclosed slot is larger than said second opening of said at least one enclosed fluid slot.
A drill bit, comprising:
- a shank for attaching to a drill string component;
- a cutting portion secured to said shank, said cutting portion including an inner surface, an outer surface, and a cutting face;
- one or more fluid notches extending from said inner surface to said outer surface and extending from said cutting face into said cutting portion, wherein said one or more fluid notches each have a first opening in said outer surface of said crown and a second opening in said inner surface of said crown, wherein said first opening is larger than said second opening;
- and
- one or more enclosed fluid slots extending from said inner surface to said outer surface.
A core drill bit, comprising:
- a shank;
- an annular crown including a first end, a second end, an inner surface, and an outer surface, wherein said first end is secured to said shank and said second end defines a cutting surface;
- a plurality of notches positioned within said cutting surface of said annular crown, said plurality of notches extending from said inner surface of said annular crown to said outer surface of said annular crown, wherein at least one notch of said plurality of notches has a trapezoidal shape;
- and
- a plurality of enclosed slots extending from said inner surface of said annular crown to said outer surface of said annular crown, wherein at least one enclosed slot of said plurality of enclosed slots has a trapezoidal shape.
Dependencies are inferred from the claim text.