Tunnelling apparatus
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United States of America Patent
Stats
-
Nov 3, 1981
Grant Date -
N/A
app pub date -
Jun 12, 1980
filing date -
Jun 25, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tunnelling apparatus has an annular tunnelling element subdivided into a leading and a trailing chamber. The front end of the leading chamber is open to the material-removing face. A material-removing cutting device is lodged in an opening formed in the transverse wall to remove material from the working face. It can be axially withdrawn from the opening into and if necessary rearwardly beyond the trailing chamber, so as to expose the opening and permit access of an operator to the working face through the opening.
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