Hydraulic circuit for cylinder

Details Hydraulic circuit for cylinder Hydraulic circuit for cylinder

1989-02-27

1990-09-11

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91461, F15B 1108

Patent

active

049552830

ABSTRACT:
A hydraulic circuit suitable for use on power shovel or other construction machines, more specifically a hydraulic circuit for a cylinder in a hydraulic power transmission, of the type which is adapted to control pressurized oil flows to and from two oil chambers in the cylinder by switching the position of a directional control valve in communication with a pressurized oil source. The hydraulic circuit includes a logic valve provided between the directional control valve and a load-holding oil chamber in the cylinder. The logic circuit has first and second ports connected to the directional control valve and said load-holding oil chamber, respectively. A selector valve is responsive to the switching of the directional control valve to communicate a spring chamber of the logic valve with a conduit between the first port and the directional control valve in an operational phase of supplying pressurized oil to a load lowering chamber of the cylinder and to communicate the spring chamber with the second port in other operational phases.

REFERENCES:
patent: 3805678 (1974-04-01), Bianchetta et al.
patent: 4088151 (1978-05-01), Schurger
patent: 4194532 (1980-03-01), Hall
patent: 4204459 (1980-05-01), Johnson
patent: 4391183 (1983-07-01), Broms et al.
patent: 4417502 (1983-11-01), Shore
patent: 4509406 (1985-04-01), Melocik
patent: 4571941 (1986-02-01), Aoyagi et al.
patent: 4753158 (1988-06-01), Hirata et al.

Affiliated with

Also associated with

Rating

Hydraulic circuit for cylinder 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 cylinder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic circuit for cylinder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1177569