FLUSHING UNIT FOR DRILLING BIT Russian patent published in 2013 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: flushing unit for a drilling bit comprises channels for supply of flushing fluid to a bottomhole, seats at the outlet from channels for placement of wear-resistant attachments with sealing and stop elements. The stop element is made in the form of a pin, one end of which has thread and is screwed into the response hole in the body in the area of the seat wall under the end ledge of the attachment, locking it. The other end of the pin protrudes from the hole and is bent to the surface of the thrust slot on the body surface at the angle α>25°.

EFFECT: higher reliability and durability of a drilling bit with a replaceable flushing unit.

6 dwg