FLUSHING ASSEMBLY OF DRILLING BIT (VERSIONS) Russian patent published in 2015 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: flushing assembly of a drilling bit includes a housing with a channel and a seat having an annular bore, a head piece with a sealing element installed in the seat and a limit stop arranged in the annular bore of the seat, and a fastening assembly. Difference consists in the fact that the fastening assembly comprises a plate, a latch and a protective casing. When in a working position, a free end of the latch is arranged in the slot of the plate to interact with the side wall of the plate and fixed relative to the plate by means of a screw. The protective casing is of a cylindrical three-stage type with an internal channel; a stage of larger diameter has a possibility of being borne against the housing surface; a stage of average diameter has an external thread mating the internal thread in the seat of the flushing assembly, and presses the plate and the latch to the limit stop and the head piece with its end face, and a stage of smaller diameter ends near the end face of the head piece. The internal channel of the protective casing has screw thread.

EFFECT: improving operating efficiency of a flushing assembly.

2 cl, 6 dwg