Pile driver
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 18, 2011
Grant Date -
May 28, 2009
app pub date -
Nov 26, 2008
filing date -
Nov 27, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
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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