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US 6,186,250 B1Granted
Sharp gage for mill tooth rockbits
AssigneeRock Bit International, Inc.
InventorRoy Estes
Life of this patent
Estimating the term…
Abstract
A design for a gage tooth of the milled tooth variety is provided. The gage facing surface of each tooth is shaped so that only a narrow surface of each tooth contacts the borehole wall. Adjacent areas on each tooth slope away from the wall. The narrow gage facing surfaces, the sloping areas, and other areas are all covered with a suitable hard metal facing material.
Claims9
A milled tooth cone for a drill bit utlized to form a borehole comprising:
- (a) a cone having an outside surface and also having a row of milled teeth wherein each of the teeth has, the cone defining an axis of rotation:
- (i) a cutting surface of narrow dimension on the size facing the borehole's wall the surface at an angle to the axis of rotation, the surface defining first and second substantially parallel edges,
- (ii) a leading face extending to the first edge, and
- (iii) a trailing face extending to the second edge;
- (b) a hard material cladding covering the milled teeth wherein the cladding fully covers the milled teeth.
2 more elements
Dependencies are inferred from the claim text.