Machine for making underground excavations

Details Machine for making underground excavations Machine for making underground excavations

1979-01-24

1980-10-28

Purser, Ernest R.

Boring or penetrating the earth

Boring without earth removal

Combined with earth removal

175 62, 175 94, 175404, 175408, E21B 1102, E21B 106

Patent

active

042301912

ABSTRACT:
A machine for making underground excavations by compacting soil comprises an eccentric shaft having journals on which there are mounted for a free rotation in a sequence, beginning from the front end, a conical member and tapered rolls forming in combination a conically expanding body. The eccentric shaft is coupled to a drive for rotation. The conical member has a through longitudinal diffuser passage, and the eccentric shaft also has a through longitudinal diffuser passage of a cross-sectional area enlarging in the direction away from the face of the excavation being made. The cross-sectional area of the passage of the conical member is smaller than the smallest cross-sectional area of the passage of the eccentric shaft by an amount such that the inside cross-sectional area of the passage of the conical member is substantially within the limits of the inside cross-sectional area of the passage of the eccentric shaft.

REFERENCES:
patent: 1136135 (1915-04-01), Hughes
patent: 2124414 (1938-07-01), Goldman
patent: 2794623 (1957-06-01), Stokes
patent: 3181631 (1965-05-01), Nielsen
patent: 3418022 (1968-12-01), Peterson
patent: 3926267 (1975-12-01), Konstantinovich et al.

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