Cutting tool for tunnelling machine - has central advance drill at end o swinging arm attached to drill base with tool bearing arms

摘要

The cutting tool has a central advance drill (3) at the end of a swinging arm (6) which is attached to the drilling head base (1). The advance drill comprises a number of cutter rollers (4) in a holder (9). Two tool bearer arms (7) pivoted (2) on the drilling head base have cutter rollers (8) attached to their free ends, which are in holders (9) at different distances from the pivot. USE/ADVANTAGE - A cutting tool for a heating machine to work in underground tunnels. In medium firm or firm rock a high output is achieved without cutter roller holder bearings being overloaded.