Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1976-02-09
1977-10-18
Hafer, Robert A.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173 73, 173 80, B25D 900
Patent
active
040541800
ABSTRACT:
An impact drilling tool for rotary drilling which includes a reciprocating hammer inside a casing for striking the top of an anvil. A drilling bit is connected to the opposite end of the anvil for cutting into the earth's formations. The casing is connected in a string of drilling pipe through which a high pressure fluid flows for operating the hammer and removing cuttings. A feeder means extends through the hammer for alternately directing the high pressure fluid above and below the hammer which high pressure fluid causes the reciprocating motion of the hammer. A shuttle valve located around the feeder maintains communication of the high pressure fluid above the hammer for increased effective stroke to insure a harder driving action of the hammer against the anvil. Also the shuttle valve insures a more complete exhaust above the hammer which reduces the force needed to raise the hammer. In alternative embodiments, the shuttle may control only one of the exhaust or pressurization functions.
REFERENCES:
patent: 2177391 (1939-10-01), Lear
patent: 2443894 (1948-06-01), Craze
patent: 2604073 (1952-07-01), Nast
patent: 3866746 (1975-02-01), Curington
patent: 3955478 (1976-05-01), Feucht
patent: 3970152 (1976-07-01), Harris et al.
Hafer Robert A.
Mosely Neal J.
Reed Tool Company
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