Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Reexamination Certificate
2011-07-12
2011-07-12
Singh, Sunil (Department: 3672)
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
C175S073000
Reexamination Certificate
active
07976242
ABSTRACT:
The present disclosure relates to a drill head having a drill head main body including a front end portion and a back end portion. The back end portion is configured to be connected to a drill rod. A steering shell is mounted over the front end portion. A drive shaft extends through the back end portion and the front end portion of the drill head main body. The drive shaft has a front end adapted for connection to a cutting unit and the drive shaft is rotatably supported within a bearing at the front end portion of the drill head main body. A steering shell driving arrangement is incorporated into the front end portion of the drill head main body for generating relative radial movement between the steering shell and the drill head main body.
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Harrison Stuart
Salins Andis
Merchant & Gould P.C.
Singh Sunil
Vermeer Manufacturing Company
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