Rectangular shield excavating machine

Details Rectangular shield excavating machine Rectangular shield excavating machine

1992-01-06

1993-03-02

Reese, Randolph A.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

405138, 405184, 299 69, 175 91, E21D 908

Patent

active

051904071

ABSTRACT:
A rectangular shield excavating machine comprises a quadrangularly tubular shield body having a space for receiving an excavated matter at the front end, a rotor disposed in the space so as to be capable of being rotated onward and backward angularly around an axis extending in the direction orthogonal to a pair of facing exterior portions of the body, and excavating means disposed in the body, drive means for rotating onward and backward the rotor angularly around the axis, and for driving the excavating means. Large gravels contained in the excavated matter are crushed by being put between the rotor and a member defining the space with the rotationally reciprocating motion of the rotor.

REFERENCES:
patent: 2825544 (1958-03-01), Ahlson
patent: 2950902 (1960-08-01), Olds
patent: 3711159 (1973-01-01), Mazzotti
patent: 3856357 (1974-12-01), Wharton
patent: 4045088 (1977-08-01), Becham
patent: 4692062 (1987-09-01), Akesaka
patent: 4886396 (1989-12-01), Akesaka
patent: 5102201 (1992-04-01), Akesaka

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