Method and device in earth cutting

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

1980-01-23

1981-06-23

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175 53, 175344, 175376, E21B 1016, E21B 1020, E21B 1028

Patent

active

042744962

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. The roller cutters in the same set of cutters have the same number of rows of cutting means. The roller cutters are mounted in pairs on each side of the rotational axis of the bore head. During rotation of the bore head the cutting means 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.

REFERENCES:
patent: 3203492 (1965-08-01), Lichte
patent: 3612197 (1971-10-01), Motoyama
patent: 3659659 (1972-05-01), Lichte
patent: 3659660 (1972-05-01), Conn
patent: 3726350 (1973-04-01), Pessier
patent: 3805901 (1974-04-01), Coski
patent: 3858667 (1975-01-01), Goodfellow

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