Patent · US Expired

Mine roof supports

US4449860A · kind A · utility

1Cited by

2References

15Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Kunibert Becker · Werl, DE
Burckhard Elsner · Grafenau, DE
Rudiger Kirchbrucher · Holzwickede, DE

Key dates

Filing date	Apr 12, 1982
Grant date	May 22, 1984
Priority date	—
Expiry date	Apr 12, 2002

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D23/066
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A mine roof support has a main roof bar which is pivotably connected to an auxiliary forwardly-extendible bar. At least one piston and cylinder unit serves to swing the auxiliary bar about the main bar to bring the auxiliary bar into a roof-contacting position aligned with the main bar or into a stowed position beneath the main bar or into some intermediate position. One or more pivotable guide levers connect the auxiliary bar to the piston and cylinder unit. A guide member is also connected to the unit and slidably locates in longitudinal guideways formed in ribs or the like at the underside of the main roof bar.

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