ROCK-BREAKING TOOL Russian patent published in 2003 - IPC

FIELD: rock-breaking tools used jointly with drill bit in process of drilling of holes of various assignment. SUBSTANCE: rock-breaking tool includes cone drill bit and above-bit gauger coming in the form of body with step and eccentrics carrying cones arranged one above another and fixed by coupling. Body is fitted with pressure compensators, contactors and spring-loaded controllers. Vessel for lubricant and lubricant-feeding passages are made in step of body, face of lower cone of gauger has ring protrusion and recess in it. Contactors and controllers interacting with them are installed in lubricant-feeding passage to shut off vessel in which compensators are mounted. Ring protrusion is positioned above contactors for interaction with them. Rock-breaking tool is made up of hollow component parts which number is three of more with internal curvilinear spiral-shaped guides for core movement. EFFECT: enhanced wear resistance of rock-breaking tool. 3 dwg