Patent · US Expired

Longwall mineral winning machine with adjustable cutting jet

US4375904A · kind A · utility

3Cited by

4References

13Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Klaus Beckmann · Grafenau, DE
Kunibert Becker · Werl, DE

Key dates

Filing date	Jan 27, 1981
Grant date	Mar 8, 1983
Priority date	—
Expiry date	Jan 27, 2001

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C25/60
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A shearer-type mineral winning machine has rotatable cutting drums supported by swinging arms at the ends of its main body. High-pressure water emission nozzles are supported by adjustable carriers in positions generally adjacent the drums to effect preliminary cuts in a mineral face just in advance of the cutting drums.

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