Patent · US Expired

Apparatus for cutting rock

US4555143A · kind A · utility

15Cited by

5References

13Claims

0Family size

Assignee

Voest-Alpine · AT

Inventors

Herwig Wrulich · Zeltweg, AT
Otto Schetina · Zeltweg, AT
Gottfried Siebenhofer · Wien, AT
Wilfried Maier · Eppingen, DE

Key dates

Filing date	Mar 29, 1984
Grant date	Nov 26, 1985
Priority date	—
Expiry date	Mar 29, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P40/00
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

For cutting rock by means of cutting head (1) having its bits (24) cooperating over a limited axial shifting stroke (a) with a cylinder-piston-aggregate, for example a valve (18), it is proposed to intermittently subject the cylinder-piston-aggregate to the action of pressurized fluid, thus exposing the bit (24) during its engaging the rock to percussion forces. During the phases lacking any action of pressurized fluid onto the cylinder-piston-aggregate, the bit (24) shall be pushed into its starting position. This embodiment can be realized with both hydraulic and pneumatic cylinder-piston-aggregates, noting that in case of an embodiment having a hydraulic cylinder-piston-aggregate it is preferred to design this cylinder-piston-aggregate as a valve (18) which simultaneously provides the possibility to expel pressurized liquid via a spraying nozzle (32) onto the mine face. (FIG. 2)

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