Hydraulic circuit for automatic control of a horizontal boring m

Details Hydraulic circuit for automatic control of a horizontal boring m Hydraulic circuit for automatic control of a horizontal boring m

1995-01-06

1996-10-15

Hepperle, Stephen M.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

60426, 137118, 13711806, 173 1, 173 8, 173 9, E21C 516

Patent

active

055644554

ABSTRACT:
A hydraulic circuit (10) is disclosed for use in controlling a horizontal boring machine which requires hydraulic fluid under pressure for rotating a drill bit or backreamer through a rotation circuit and hydraulic fluid under pressure for thrusting the drill bit or backreamer within the bore hole through a thrust circuit. Pressures from both the thrust circuit and control circuit are combined through restrictors in a mixing zone or area (26). The control port of a diversion valve (32) is connected to mixing zone (26). When the combined pressure in the mixing zone exceeds the adjustable spring bias on the diversion valve, the diversion valve will open, diverting fluid from the thrust circuit to a low pressure zone. This will cause a reduction in the pressure in the rotation circuit as well. The reduction of both pressures will reduce the combined pressure in the mixing zone (26), causing the diversion valve to close and the pressures to increase. The hydraulic circuit maintains a constant maximum output for both circuits for a given horsepower input to the boring machine and productivity is enhanced due to reduced operator fatigue.

REFERENCES:
patent: 2804751 (1957-09-01), Schroeder
patent: 2905441 (1959-09-01), Poundstone
patent: 3385376 (1968-05-01), Hobhouse
patent: 3802514 (1974-04-01), Ein
patent: 4271914 (1981-06-01), Dressel
patent: 4356871 (1982-11-01), Fujikawa
patent: 4711090 (1987-12-01), Hartiala et al.
patent: 5358058 (1994-10-01), Edlund et al.
patent: 5388649 (1995-02-01), Ilomaki

Affiliated with

Also associated with

Rating

Hydraulic circuit for automatic control of a horizontal boring m does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydraulic circuit for automatic control of a horizontal boring m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic circuit for automatic control of a horizontal boring m will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1238792