FLUSHING ASSEMBLY OF DRILLING BIT Russian patent published in 2014 - IPC E21B10/18 E21B10/60 E21B10/61 

FIELD: mining.

SUBSTANCE: invention refers to flushing assemblies of a rock-destructing tool of water jet type. A flushing assembly of a rolling drilling bit with a central flushing system includes a housing with a channel and a seat, in which there fixed by means of a threaded bushing is a head piece with a sealing element and a torque transfer assembly. The latter is formed with inclined slots made on inner surface of the head piece; besides, direction of slots coincides with direction of the fastening bushing thread; the head piece and the bushing are provided with mating projections and cavities on contact surface for transfer of torque, and the number of slots corresponds to the number of rolling cutters. Slots are directed to space between rolling cutters and have conoidal shape.

EFFECT: improving drilling bit operating reliability and efficiency.

2 dwg