Wear resistant plates on a leading transitional surface of the leg for a rotary cone drill bit

摘要

A rotary cone drill bit includes: a body, a leg depending from the body, a bearing shaft extending from the leg and a cone mounted to the bearing shaft. The leg includes a leading transitional surface. A bottom surface of a hard material plate is attached to a substantially conforming surface of the leg in a position where the hard material plate is disposed on a floor surface formed in or by the leading transitional surface of the leg.

主权项

1. A rotary cone drill bit, comprising:
a body; a leg depending from the body, wherein the leg includes:
a shirttail surface delimited at an upper end by a shoulder and at a lower end by a curved shirttail edge, anda shirttail contour mill formed on a leading side of the leg and adjacent to the shirttail edge; a bearing shaft extending from the leg; a cone mounted to the bearing shaft; a preformed hard material plate having a bottom surface; and an adhesive material attaching the bottom surface of the hard material plate to the leg at least partially on the shirttail contour mill, wherein a top surface of the hard material plate is substantially flush with the shirttail contour mill.