Device for sinking or widening shafts

摘要

The device according to the invention for sinking or widening shafts has a vertically pivotable cutting arm (4) which is rotatable about three parallel axes of rotation (10, 15, 21), one axis of rotation (10) coinciding with the shaft axis. The entire cutting device is mounted on a supporting frame (3), capable of being clamped in the shaft (1), preferably so as to be liftable and lowerable with respect to the supporting frame. The rotatability of the cutting arm (4) about the three axes of rotation gives the cutting arm a large active range, and the cutting arm can be used to cut either a plane shaft bottom (26) or a dome-shaped shaft bottom in the case of shaft-widening work. <IMAGE>