Tool driving or impacting – With vehicle support for drive – Pivoted
Reexamination Certificate
2011-01-18
2011-01-18
Nash, Brian D (Department: 3721)
Tool driving or impacting
With vehicle support for drive
Pivoted
C173S193000, C173S184000, C173S042000, C173S090000
Reexamination Certificate
active
07870911
ABSTRACT:
A pile driver includes a leader rotation/holding mechanism that can firmly hold a leader in a rotatable state and also reliably rotate the leader using a general-purpose, inexpensive hydraulic motor by keeping the hydraulic motor from action of a bending moment from the leader. The pile driver has a leader revolver that includes a mechanism for rotating a leader. The leader revolver includes an outer tube and an inner tube that is concentrically arranged inside the outer tube via a pair of tapered roller bearings provided at two upper and lower positions. A lower part of the leader is connected, in an integrally rotatable state, to an upper part of the inner tube protruding upward from an upper end opening of the outer tube. A hydraulic motor is placed in a lower part of the leader revolver.
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Tomida Nobuyuki
Yoshida Shigemitsu
Edwards Angell Palmer & & Dodge LLP
Nash Brian D
Nippon Sharyo, Ltd.
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