Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1974-02-11
1976-05-25
Abbott, Frank L.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173 73, 173 78, 173 80, E21B 500, E21C 700
Patent
active
039586456
ABSTRACT:
An air hammer embodying an outer housing structure connectible to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housing structure along flexible inlet and outlet tubes, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. The piston contacts the housing structure at the upper and lower portions of the piston only, so that the piston can deviate upon flexing of the housing structure under load, and not bind in the housing structure, as permitted by the flexible inlet and outlet tubes. Excess compressed air is permitted to bypass through an orifice in the piston itself, to assist in cleaning the bore hole of cuttings and to avoid excess back pressure in the tool above the piston, resulting from the excess air delivered by the air compressor.
REFERENCES:
patent: 1518124 (1924-12-01), Mercer
patent: 3085555 (1963-04-01), Morrison
patent: 3198264 (1965-08-01), Oelke et al.
patent: 3503459 (1970-03-01), Schindler
patent: 3756328 (1973-09-01), Sodnishnikov
patent: 3826316 (1974-07-01), Bassinger
Abbott Frank L.
Bakerdrill Inc.
Kriegel Bernard
Pate III William F.
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