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US 7,744,164 B2Granted
Shield of a degradation assembly
AssigneeSchluimberger Technology Corporation
InventorsDavid R. Hall, Ronald Crockett, Scott Dahlgren
Life of this patent
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Abstract
In one aspect of the present invention, a degradation assembly comprises a shank with a forward end and a rearward end, the rearward end being adapted for attachment to a driving mechanism, with a shield rotatably attached to the forward end of the shank. The shield comprises an underside adapted for rotatable attachment to the shank and an impact tip disposed on an end opposing the underside. A seal is disposed intermediate the shield and the shank.
Claims20
A degradation assembly comprising:
- a shank comprising a forward end and a rearward end, the rearward end being adapted to be retained in a holder attached to a driving mechanism;
- an underside of a shield rotatably connected to the forward end of the shank;
- and
- the distal most surface of the forward end is a load bearing surface;
- the shield also comprising a carbide bolster bonded to the impact tip at an end opposing the underside;
- wherein the carbide bolster is disposed axially intermediate the impact tip and a steel portion of the shield along the assembly's central axis;
- wherein a first and second cylindrical bearing surface on a large and smaller diameter of the forward end respectively is separated by a non-bearing, substantially conical portion of the forward end.
4 more elements
Dependencies are inferred from the claim text.