Bit exchange method and bit exchange device for shield tunneling machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9222357
APP PUB NO 20140357461A1
SERIAL NO

14371852

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Sealing in the sliding gap of a rotating valve is improved to smoothly rotate the rotating valve during replacement of a roller bit. A valve housing portion is formed behind a bit housing portion having an opening at the front of a main cutter spoke. A rotating valve is rotationally disposed as a rotating body in the valve housing portion. A bit case containing the roller bit is moved into the bit housing portion so as to protrude from a removable passage of the rotating valve, and then the bit case is fixed by a cotter member to support a drilling reaction force. Thus, the sliding gap of the rotating valve is disposed in the bit housing portion and the valve housing portion and is covered with the bit case.

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Patent Owner(s)

  • HITACHI ZOSEN CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yokoyama, Mitsuhisa Osaka, JP 1 3

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Jun 29, 2027
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