DRILL BIT Russian patent published in 2016 - IPC E21B10/18 

FIELD: drilling soil or rock.

SUBSTANCE: drill bit includes a leg with mounted on them cutters and treatment systems with flow channels and rotary guide vanes that guide the flow of sewage in the cone. Bit is equipped with tension springs connecting the legs to the dampers to shut off flow channels treatment system in the event of a clearing agent. Each butterfly valve is connected to the claw via a pin to a rod adapted to be axially displaceable in the paw by means of a tension spring, one end of which is connected to a rod, and the other - through the second pin with the paw. Flow channels formed in the lower part of the diffuser, and the damper have mating protrusions form.

EFFECT: technical result is to increase the effectiveness of the bit due to prevent sludge nipple cavity bit.

1 cl, 2 dwg