Title: Percussive action pneumatic device for drilling holes in soil

Abstract: The percussive action pneumatic device for drilling holes in a soil by cocting same has a cylinder-shaped housing with a conically pointed head portion. This pointed head portion of the housing is engaged in the internal surface of the tail portion of a hollow tip with a pointed end. A transverse partition is provided internally of the hollow tip, in the tail portion thereof, the head portion of the housing is detachably connectable with the transverse partition.

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Inventors: Kostylev, Alexandr D. (Novosibirsk, SU)
Chepurnoi, Nikolai P. (Novosibirsk, SU)
Plavskikh, Vladimir D. (Novosibirsk, SU)
Cherednikov, Evgeny N. (Novosibirsk, SU)

Application Number: 866864
Filing Date: 1978-01-04
Publication_date: 1979-11-20
Assignee: Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR (SU)
Primary Class(es): 175/19 403/349
Other Classes:
US Patent Ref:

2367458	Jan, 1945	Coplen	403/348.
2379984	Jul, 1945	Nereaux	403/348.
2902832	Sep, 1959	Levy et al.	175/19.
3685597	Aug, 1972	Kostylev et al.	175/19.

Other Refs: 2400522

Sep, 1974	DE

Primary Examiner: Purser, Ernest R.
Assistant Examiner: Favreau, Richard E.
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.