Pneumatic impact drilling tool

Details Pneumatic impact drilling tool Pneumatic impact drilling tool

1976-12-06

1978-08-15

Staab, Lawrence J.

Tool driving or impacting

Work cleansing

By motive fluid for drive motor or advance causing or...

173 71, 173 73, 175100, B25D 1714

Patent

active

041065719

ABSTRACT:
A pneumatically operated impact drilling tool for earth drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder tube extending through the hammer. The drilling tool is connected to a string of drilling pipe and high pressure compressed air or other pneumatic fluid is introduced to operate the tool. The feeder tube directs the flow of fluid through ports in the hammer to alternate pressure on opposite sides of the hammer to move the same upward and downward relative to the anvil. An elastomeric check valve is positioned inside the upper end of the feeder tube. The air inlet end of the tube is also provided with air jet passages extending upward and outwardly and having check valves operated in the outflow direction. A flow controlling washer may also be provided at the inlet to the check valve in the feeder tube.

REFERENCES:
patent: 2859733 (1958-11-01), Bassinger
patent: 2917025 (1959-12-01), Dulaney
patent: 2998085 (1961-08-01), Dulaney
patent: 3045768 (1962-07-01), Huffman
patent: 3077903 (1963-02-01), Honsinger
patent: 3667555 (1972-06-01), Elenburg
patent: 3944003 (1976-03-01), Curington
patent: 3964551 (1976-06-01), Bassinger
patent: 4054180 (1977-10-01), Bassinger

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