Patent · US Expired

Arrangement for emergency operation of hydraulic appliance in an electro-hydraulically controlled mineral mining installation

US5060556A · kind A · utility

5Cited by

3References

7Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Walter Weirich · Dortmund, DE
Michael Dettmers · Kamen, DE
Uwe Trox · Bohmte, DE

Key dates

Filing date	Sep 28, 1990
Grant date	Oct 29, 1991
Priority date	—
Expiry date	Sep 28, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87885
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

An electro-hydraulic control system for a mineral mining installation has a series of valve blocks, each contain a number of valves which are operated in dependence on electrical signals to cause hydraulic appliances of roof supports to operate. To allow emergency operation, when there is a power failure or when the control system fails or is otherwise inoperative, further manually operable valves are connected by a flexible, multi-core connecting cable to the valve block of the associated support. The emergency control valves can operate hydraulically controllable direction control valves of the control system and by-pass the electrical controls. The support can then be controlled purely hydraulically, at least in its main functions, using the emergency device.

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