FIELD: mining.
SUBSTANCE: drilling bit assembly unit contains a lead bit and an annular bit connected by means of grooves and brackets and a facility leading protective pipe into a well bore in the course of drilling. The annular bit is fitted with grooves made on the back-end to connect the lead bit furnished with goggle joints to transmit rotary actuating and extrusive force to the annular bit.
EFFECT: simplified manufacture; prompt and reliable fixation of lead bit with annular bit inside well.
5 cl, 5 dwg
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