Atlas Copco Ab

Epiroc Drilling Tools LLC

Jeffrey P White

Leland H Lyon

Warren Thomas Lay

Michael A White

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.

Off bottom flow diverter sub

A fluid channeling device is for a percussive drill including a casing having an interior space, drive and valve chambers defined within the interior space, a piston disposed within the casing and having an upper end disposeable within the drive chamber and a longitudinal through-bore, and a valve for controlling flow into the drive chamber. The device includes a first member partially disposed within the drive chamber so as to extend into the piston bore when the piston end is within the drive chamber. The first member has an outer surface, an interior space and one or more ports extending between the outer surface and interior space and fluidly connectable with the drive chamber. A second member is disposed within the first member interior and has a passage fluidly connected with the valve chamber and fluidly connectable with the port(s) to establish fluid communication between the drive and valve chambers.

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Vinton, VA, United States of America

Jeffrey P White