Percussion boring machine for destructive replacement of buried

Details Percussion boring machine for destructive replacement of buried Percussion boring machine for destructive replacement of buried

1991-02-28

1992-07-07

Novosad, Stephen L.

Boring or penetrating the earth

Below-ground impact members

With noncutting portion forwardly of sleeve impact member...

30 925, 175296, 405156, 405184, E21B 1102, F16L 1028, F16L 5526

Patent

active

051274817

ABSTRACT:
A percussion boring machine for destructive replacement of buried pipelines, having an opening-out cone at the back of the machine housing and cutters spaced in front of said cone, wherein the cutters form part of a breaking-up head slipped on to the housing and the opening-out cone is likewise slipped on to the housing.

REFERENCES:
patent: 3181302 (1965-05-01), Lindsay
patent: 4634313 (1987-01-01), Robbins
patent: 4648746 (1987-03-01), Abinett
patent: 4674914 (1987-06-01), Wayman
patent: 4732222 (1988-03-01), Schmidt
patent: 4738565 (1988-04-01), Streatfield et al.
patent: 4848964 (1989-07-01), Yarnell
patent: 4981181 (1991-01-01), Hesse

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