Tool driving or impacting – Impacting devices – With means to cause or control advance of hammer head
Patent
1984-05-16
1986-02-18
Schran, Donald R.
Tool driving or impacting
Impacting devices
With means to cause or control advance of hammer head
173 90, 175 19, B25F 502
Patent
active
045707235
ABSTRACT:
A machine for driving holes in the ground comprises a cylindrical housing, hammer disposed inside the housing, and an air distribution mechanism. Longitudinal recesses and projections are provided on a portion of the outer surface of the housing at its head end section. The diameter of the cylindrical part of the housing is greater than the diameter of a circle described about the bottoms of the recesses and smaller than the diameter of a circle described about the tops of the projections.
REFERENCES:
patent: 4132277 (1979-01-01), Tupitsyn et al.
patent: 4144941 (1979-03-01), Ritter
Chepurnoi Nikolai P.
Karavaev Andron T.
Kostylev Alexandr D.
Plavskikh Vladimir D.
Reznikov Igor I.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
Schran Donald R.
Wolfe James
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