Submerged hole driller component element

Abstract

The invention provides a down-the-hole drill assembly having exhaust passages from upper and lower chambers past the inner end of a bit and through the body of the bit to exit through the bit face. The construction of the assembly and bit obviates a foot valve tube from the head of the bit and the disadvantages associated with this component.

Description

technical field [0001] The invention relates to a down-the-hole drilling tool assembly, in particular to an assembly without using a bottom valve pipe. Background technique [0002] Valveless down-the-hole hammer drills often must have a bit with a replaceable foot valve tube extending from the head of the bit at the impact face of the bit and piston. The bottom valve tube extends into the bore of the piston and is pulled out of the bore of the piston when the piston is removed from the drill bit. Exhaust from the upper or lower chamber is discharged into the atmosphere through the center of the bottom valve pipe through the center hole of the drill bit. [0003] When the piston hits the drill bit, the hole of the piston is engaged with the bottom valve tube, and the upper chamber exhausts through the hole of the piston passing through the center of the bottom valve tube and exhausts to the atmosphere through the hole of the drill bit. [0004] As the piston reciprocates u...

AI Technical Summary

Problems solved by technology

This will further restrict the exhaust air of the hammer drill and will result in reduced performance of the hammer drill

Another problem is that the bottom valve tube often breaks

This causes downtime for the driller as he has to pull the bit out of the hole, remove the bit from the hammer drill and replace the bottom valve tube

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