Patent · US Expired

Cutter bit assemblies and arrangements for use with mining or tunnelling machines

US5092660A · kind A · utility

9Cited by

1References

20Claims

0Family size

Assignee

Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

Bernd Steinkuhl · Grafenau, DE
Christoph Rassmann · Grafenau, DE
Oswald Breuer · Lichtenau, DE
Egon Pfefferle · Hamm, DE

Key dates

Filing date	Oct 22, 1990
Grant date	Mar 3, 1992
Priority date	—
Expiry date	Oct 22, 2010

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C35/191
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A cutter bit assembly for a mining or tunnelling machine has a cutter shank detachably fitted into a socket of a holder. To secure the shank in position a piston is displaced to cause pressure fluid to flow into a working chamber and act on a piston at one end of a rod-like securing element. The element is forced against a surface of the shank to urge the shank about a pivot and this in turn thrusts rear support surfaces of the cutter and the holder together. To release the cutter the pressure fluid is relieved and spring force displaces the securing element away from the shank. In this released condition, the cutter can be swivelled about the pivot and withdrawn from the socket.

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