Patent · US Expired

Cap positioning mechanism

US4447174A · kind A · utility

3Cited by

3References

18Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Kunibert Becker · Werl, DE
Gerd Dunkel · Grafenau, DE
Gunter Lagodka · Grafenau, DE
Rudiger Kirchbrucher · Holzwickede, DE

Key dates

Filing date	Feb 26, 1982
Grant date	May 8, 1984
Priority date	—
Expiry date	Feb 26, 2002

Classification

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

Abstract

A mine roof support unit has a mechanism for adjusting the angular position of an auxiliary cap relative to a main cap, the auxiliary cap and the main cap forming the roof cap of the mine roof support unit. The auxiliary cap is connected to the main cap by a first pivot joint. The cap-positioning mechanism comprises a hydraulic ram and a lever acting between the main cap and the auxiliary cap. The auxiliary cap is provided with an extension arm projecting from the first pivot joint towards the main cap. One end portion of the lever is connected to the arm by a second pivot joint, and the other end of the lever is connected to a block attached to the piston rod of the ram by a third pivot joint. The cylinder of the ram is attached to the main cap.

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