Patent · US Expired

Two part mine roof support unit

US4401399A · kind A · utility

1Cited by

10References

17Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Kunibert Becker · Werl, DE
Burckhard Elsner · Grafenau, DE
Gerd Dunkel · Grafenau, DE

Key dates

Filing date	Jun 29, 1981
Grant date	Aug 30, 1983
Priority date	—
Expiry date	Jun 29, 2001

Classification

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

Abstract

A mine roof support unit is constituted by two detachably connected parts. Each of the parts has a floor girder which supports a roof bar by means of a hydraulic prop. The roof support unit is intended for use at the lower end of an inclined longwall working which meets its access gallery at an angle other than 90.degree.. The detachability of the two parts enables one of these parts to be removed from the working as its face is advanced. The removed part can then be transported to the other end of the working. Each of the parts is provided with means for detachably connecting an advance mechanism.

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