Patent · US Expired

Control of the actuation of hydraulic consumers

US4702148A · kind A · utility

8Cited by

5References

13Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Willy Kussel · Werne, DE
Michael Dettmers · Kamen, DE
Walter Weirich · Dortmund, DE

Key dates

Filing date	Jun 25, 1986
Grant date	Oct 27, 1987
Priority date	—
Expiry date	Jun 25, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86686
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

The invention relates to a method for the simultaneous actuation of a plurality of hydraulic consumers by means of intrinsically-safe electro-hydraulic valves. The consumers are connected by hydraulic directional control valves to a pressure line and/or a return line. These hydraulic directional control valves can be connected in a predetermined manner, via pre-control valves to a control line. The pre-control valves are pressureless, and possess electro-magnets with a current consumption of less than 50 milliamps. By connection of a series-connected electro-hydraulic directional control valve means, the pre-control valves are connected to the control line, and at the same time are hydraulically locked.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.