IMMERSION HYDRAULIC HAMMER Russian patent published in 2002 - IPC

FIELD: hole drilling equipment, particularly, immersion drilling devices with positive-displacement hydraulic drives for rotary-percussion drilling of holes; applicable in geological prospecting, hydrogeology and mining industry. SUBSTANCE: hydraulic hammer includes body with a sleeve, discharge rod, hammer with central through channel and head separating sleeve cavity into chambers of forward and back strokes and feed and discharge systems of forward stroke chamber containing a discharge valve installed on a discharge rod; feed, drain, discharge and command channels. The field channel of feed and discharge system of forward stroke chamber has a valve in the form of flexible ring installed in the hammer head with annular clearance relative to the sleeve. EFFECT: higher operating reliability. 2 dwg