Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent
1986-11-10
1989-05-09
Yost, Frank T.
Tool driving or impacting
Impacting devices
Impact transmitting anvil
91269, B23B 4516
Patent
active
048280488
ABSTRACT:
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.
REFERENCES:
patent: 3903972 (1975-09-01), Bduyoucos et al.
patent: 4044844 (1977-08-01), Harris et al.
patent: 4150603 (1979-04-01), Eberzinston et al.
patent: 4474248 (1984-10-01), Musso
patent: 4646854 (1987-03-01), Arndt et al.
Mayer James R.
Patterson William N.
Fridie Jr. Willmon
Martin Michael E.
Yost Frank T.
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