HYDRAULIC MECHANISM FOR PERCUSSIVE OPERATION Russian patent published in 2004 - IPC

FIELD: mining industry. SUBSTANCE: device has body with gas energy accumulator, lead up chamber, in which stepped valve and face with head and double-sided coupling rod are consecutively placed, and which is equipped with two supports placed on the body on both sides of the head, which forms a slit choke at the end of face working stroke. Device also has overflow hollow which is periodically connected to lead up chamber and which may be transformed into force-pumping hollow while retaining constant connection two below-valve hollow. Valve of mechanism is placed in a hollow of bushing additionally placed in the body with forming of overflow hollow, periodical connection of which to confluent main line is formed through radial aperture in the bushing, and confluent hollow formed by a recess along outer surface of bushing and by inner surface of body. Said radial aperture in the bushing for transforming overflow hollow into force-pumping hollow is made in form of choke. EFFECT: increased effectiveness and reliability. 1 dwg