Vertical hole excavating machine
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United States of America Patent
Stats
-
Aug 25, 1998
Grant Date -
N/A
app pub date -
Dec 5, 1996
filing date -
Aug 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vertical hole excavating machine having a cutter head comprising: a first head supported rotatably about the axis of a cylindrical shield body at the lower end of the cylindrical body and having a central space vertically extending therethrough; at least one first cutter mounted on the first head to excavate earth under the first head; a second head disposed coaxially in the central space so as to be mounted or dismounted from above, and having a cylindrical portion for receiving matter excavated by the first cutter therein and a bottom plate for closing the lower end of the cylindrical portion; and at least one second cutter mounted on the second head to excavate earth under the second head. It is characterized in that the second head is further provided with a notch to receive matter excavated by the second cutter into the cylindrical portion.
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