CONE DRILL Russian patent published in 2002 - IPC

FIELD: mining industry, hole drilling with face blow-through with air or air and water mixture. SUBSTANCE: cone drill has hollow nipple with inclined ducts in feet to blow-through bearings of cones, central hole with blow-though nozzle anchored in it and connected to non-return valve that has body with side windows housing piston, distributor of blow-through flow, spring. Distributor of blow-through flow embraces body, is mounted on it for movement along its axis and is coupled to piston with the aid of bar. One end of it is anchored in butt of piston and finger is fixed in hole on the other end. Finger enters longitudinal slots made in diametrically opposite sides of body and its other end is positioned in hole of distributor of blow- through flow. Lid has hole and spring is put on body and rests with one end against limiting washer and with other end against butt of distributor of blow-through flow. In non-operational position of valve side windows and longitudinal slots are shut off by distributor of blow-through for uninterrupted circular sealing over body of non-return valve. EFFECT: simplified design and increased operational reliability of cone drill. 1 dwg