Patent · US Expired

Mineral mining installation

US4639169A · kind A · utility

2Cited by

4References

11Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Kunibert Becker · Werl, DE
Rudiger Kirchbrucher · Holzwickede, DE
Michael Preuschoff · Lüdinghausen, DE

Key dates

Filing date	Jan 30, 1985
Grant date	Jan 27, 1987
Priority date	—
Expiry date	Jan 30, 2005

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D23/081
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A mineral mining installation comprises a roof support unit and an advance mechanism. The roof support unit has a floor sill constituted by two floor girders. The advance mechanism comprises a hydraulic advance ram, the advance ram having a relatively-displaceable cylinder and a piston rod, and a device for selectively limiting the working stroke of the ram. The stroke-limiting device comprises a stop fixed to the cylinder of the advance ram, and an adjustable stop member which is mounted on the side wall of one of the floor girders.

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