Hydraulically driven percussion hammer

Details Hydraulically driven percussion hammer Hydraulically driven percussion hammer

1995-10-05

1998-09-08

Dang, Hoang C.

Boring or penetrating the earth

With below-ground tool drive prime mover

173126, 175296, E21B 414

Patent

active

058031880

ABSTRACT:
An hydraulically driven percussive hammer for use with down-the-hole percussive hammer drilling, the hammer having a piston and liner combination which provides for multiple stages where there are successive effective piston drive areas of diminishing size for both return and impact directions which minimizes peak pressures from hydraulic hammer effects.

REFERENCES:
patent: 2979033 (1961-04-01), Bassinger
patent: 3487752 (1970-01-01), James
patent: 4660658 (1987-04-01), Gustafsson
patent: 5497839 (1996-03-01), Moir
patent: 5542484 (1996-08-01), McInnes

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