WASHING UNIT OF DRILL BIT Russian patent published in 2013 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: washing unit of a drill bit comprises an attachment and a sealing element fixed in the seat of the bit body channel by means of a threaded bushing with a support collar on the inner surface for the end of the attachment. The attachment is made at the side of the input part with a circular collar, the outer surface of which is installed as capable of interaction with the side of the seat, at the same time an elastic element is installed between the facing ends of the circular collar of the attachment and the threading bushing.

EFFECT: increased reliability of washing unit operation, improved sealing, prevention of unscrewing.

2 cl, 1 dwg