Rectangular shield excavating machine
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
Jan 6, 1992
filing date -
Jan 14, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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