Patent · US Expired

Advance mechanism for a mine roof support unit

US4379661A · kind A · utility

7Cited by

7References

13Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Egon Wojaczek · Hamm, DE
Mustafa Soliman · Grafenau, DE
Juergen Schulte · Krefeld, DE

Key dates

Filing date	Sep 9, 1980
Grant date	Apr 12, 1983
Priority date	—
Expiry date	Sep 9, 2000

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D23/0409
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A roof support unit has a pair of spaced floor girders and an advance mechanism comprising a hydraulic advance ram and a pair of relay rods connected, at one end, to a head-piece which is attached to a longwall conveyor. The other ends of the relay rods are attached to a guide element which is slidably guided by a pair of guide rails attached to the mutually-facing sides of the floor girders. The hydraulic advance ram is pivotally attached to the guide element and to the floor girders. Means are provided for aligning the ends of the floor girders remote from the head-piece when the hydraulic advance ram is pressurized.

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