Voest-Alpine Bergtechnik Gesellschaft M.b.h.

Tamrock Voest-Alphien Bergtechnik Gesellschaft M.b.h.

Roman Gerer

Alfred J Zitz

Gottfried Siebenhofer

Kurt Schaffer

Eduard Krivec

In a driving or mining machine including cutter rolls or drums which are mounted for rotation on a cantilever arm pivotable in the vertical direction, bearings and/or gears are arranged in the axial direction of the cutter rolls or drums between parts of the rolls or drums. The bearings and/or gears are connected with the cantilever arm or an actuating means provided in the cantilever arm. At least one stationary cutter bit is arranged on the cantilever arm in the region of the bearings and/or gears between neighboring parts of the rolls or drums in a plane through which the axis of the cantilever arm passes. The cutter bit has at least two cutting edges, a first cutting edge being provided substantially tangential to the enveloping curve of the rotating bits in the direction of the axis of the cantilever arm and a second cutting edge being provided so as to enclose an angle with the first cutting edge.

Mining machine with core breakers

The bit holder (1) is nonpositively connected to a bit bushing (3) with adherence to a pressure per unit of surface area of &gt;100N/mm.sup.2 between the conical outer surface of the bit bushing (3) and the inner wall of the receiving bore (2) of the bit holder (1). After the bushing has been driven into the receiving bore (2), the conical outer surface of the bit bushing (3), formed by rectilinear generatrices, protrudes beyond the bore (2) by an excess amount (a).

Growing community of inventors

Zeltweg, Austria

Roman Gerer