Pilot-valve-controlled percussion drilling tool

Details Pilot-valve-controlled percussion drilling tool Pilot-valve-controlled percussion drilling tool

1988-07-15

1989-11-07

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

91 50, 91218, 173 78, 173134, F21B 414, F01L 1500

Patent

active

048785504

ABSTRACT:
A down-hole percussion drilling tool supplied with compressed air includes a piston reciprocated in an enclosed cylinder against a bit. A spool is continuously reciprocated in a valve chamber by a pilot fluid pressure supply, tapped from the compressed air from a major air flow passage to either a first or a second feed passage. Compressed air conducted through the first feed passage accelerates the piston toward the bit and compressed air conducted through the second feed passage accelerates the piston away from the bit. The continuous reciprocation of the spool is independent of the position of the piston relative to the cylinder.

REFERENCES:
patent: 3223182 (1965-12-01), Mikiya
patent: 3332504 (1967-07-01), Lowery
patent: 3344868 (1967-10-01), Mikiya et al.
patent: 3411592 (1968-11-01), Mantabert
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4179983 (1979-12-01), Wallace
patent: 4660658 (1987-04-01), Gustafsson

Affiliated with

Also associated with

Rating

Pilot-valve-controlled percussion drilling tool does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pilot-valve-controlled percussion drilling tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pilot-valve-controlled percussion drilling tool will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-78276