Abstract: A drill bit includes a cone section, a blade flank section, a blade shoulder section, and a plurality of blades connected to the bit body and extending away from the bit body. At least one cutting element is positioned on at least one of the plurality of blades. In addition, a plurality of thermally stable polycrystalline cutters is positioned on at least one of the plurality of blades in at least one of the cone section, the blade flank section, and the blade shoulder section of the at least one of the plurality of blades. The thermally stable polycrystalline cutters include a cutting edge that defines a line, wherein the line is substantially parallel to a tangent line of a radius line that extends from a center of the drill bit to the cutting edge.

Abstract: An air-cooled earth-boring drill bit including a plurality of lugs. Each lug includes a pin flange. A first roller race is distal to the pin flange. A thrust flange is distal to the first roller race. At least one pin flange vent slot is arranged in a surface of the pin flange opposite the first roller race. The at least one pin flange vent slot opens in a direction of a load side of a bearing. At least one thrust flange vent slot is arranged in a surface of the thrust flange facing the first rollers. The at least one thrust flange vent slot opens in the direction of the load side of the bearing. A plurality of flow passages are arranged within the lug to supply fluid to the at least one pin flange vent slot and the at least one thrust flange vent slot.

Abstract: An off bottom flow diverter subassembly. A fronthead and shank each includes a central bore. One of the shank and the fronthead has an outer diameter configured to fit within the central bore of another of the fronthead and shank. The shank and fronthead are arranged to slide longitudinally with respect to each other and are limited from sliding out of contact with each other. At least one diverting flow passage is between adjacent sliding surfaces of the shank and fronthead. Sliding the fronthead and shank with respect to each other opens and closes the diverting flow passage. Application of a force, sufficient to open the diverting flow passage, to a drill string to which the subassembly is attached in a direction toward an opening of a hole being drilled causes the diverting flow passage to open and drilling fluid to flow out of the subassembly away from the bit.