Tunnel boring machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 29, 1999
Grant Date -
N/A
app pub date -
May 12, 1997
filing date -
Nov 15, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cutterhead is supported at the front part of a main frame so as to incline at a specified angle with respect to a vertical plane. The main frame includes (i) a roof support disposed at a position corresponding to where a reaction force acts in the direction of the periphery of a tunnel against a force caused by rotation of the cutterhead, and (ii) a pusher for pushing the roof support toward the cutterhead resisting the reaction force.
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