Method and device in earth cutting

Details Method and device in earth cutting Method and device in earth cutting

E - Fixed Constructions

21

B

255/75

E21B 7/28 (2006.01) E21B 10/08 (2006.01) E21B 10/16 (2006.01) E21B 10/28 (2006.01) E21B 10/52 (2006.01)

Patent

CA 1115263

Abstract A bore head for reaming a pre-drilled hole in raise boring or for similar earth cutting operations comprising at least two sets of roller cutters (13, 14). The roller cutters in the same set of cutters have the same number of rows of cut- ting means (53, 54). The roller cutters (13,14) are moun- ted in pairs on each side of the rotational axis of the bore head (10). During rotation of the bore head (10) the cutting means (53, 54) move along concentric circles. In order to change the distance between two consecutive circles a roller cutter in one of the pairs of cutters is replaced by a roller cutter of the other set of cutters.

344700

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