WILLIAM N PATTERSON
Engineering in Littleton, CO

4828048, May 9, 1989

Nov 10, 1986

6/928967

James R. Mayer - Englewood CO
William N. Patterson - Littleton CO

B23B 4516

173134

A hydraulic in-the-hole type percussion tool including an elongated piston-hammer which is disposed for delivering percussion blows to an impact receiving bit or shank member and is adapted to reset an elongated tubular sleeve type distributing valve disposed in the tool cylinder rearwardly of the piston-hammer. The distributing valve is moved in one direction by the piston-hammer and is urged in the opposite direction by pressure fluid which is transferred to a chamber to act on a pressure surface of the distributing valve when the piston-hammer uncovers a fluid transfer port. An in-line hydraulic accumulator is disposed between the percussion mechanism and a source of working fluid and includes an annular piston forming an accumulator chamber and biased by a series of conical washer type springs. The tool is adapted to use high pressure water or drilling mud as the working fluid and which is conducted to and from opposed expansible chambers formed in an inner cylinder member. Inner and outer barrel type cylinder members are provided to define passages for conducting working fluid to the opposed expansible chambers and to conduct spent working fluid from one of the expansible chambers to a passage in the impact receiving member.

5064002, Nov 12, 1991

Apr 23, 1987

7/041704

William N. Patterson - Littleton CO

E21B 1700, E21C 306

173 80

A percussion drill rod assembly comprising an elongated inner percussion blow transmitting rod of substantially constant diameter supported in a tubular torque transmitting coupling member by spaced apart sets of resilient isolator members secured to the tubular coupling member. The drill rod assembly is connected to a shank assembly at the drill motor and an adaptor assembly at the bit end, each of which include inner percussion blow transmitting members and outer torque transmitting members. Integral drill rod assemblies having inner percussion rods and outer torque transmitting tubular coupling members are adapted for use with feed leg and sinker drills, for example.