FLUSHING ASSEMBLY OF DRILLING BIT (VERSIONS) Russian patent published in 2014 - 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 and a retaining device arranged in the annular bore of the seat, which are installed in the seat, and a fastening assembly. The fastening assembly consists of a plate, a latch and a protective casing. When a free end of the latch is in an operating position, it is arranged in the plate slot to interact with the side wall of the plate and fixed relative to the plate by means of a screw. The protective casing is three-staged and has a cylindrical shape and an internal channel; a stage of larger diameter has a possibility of being borne against the housing surface; a stage of mean diameter has an external thread that mates the internal thread in the seat of the flushing assembly, and it presses the plate and the latch with its end face to the retaining device and the head piece, and a stage of smaller diameter ends near the head piece end face. There are blind holes for a key on the outlet end face of the protective casing.

EFFECT: improving operating efficiency of a flushing assembly.

2 cl, 6 dwg