Title:
杭打機及び杭打機の使用方法
Document Type and Number:
Japanese Patent JP6932471
Kind Code:
B2
Abstract:
To provide a pile driver having a hydraulic circuit for outrigger jack control capable of allowing an appropriate elongation force to act on all outrigger jacks to such an extent that a crawler-type base machine is not elevated by a simple operation, and a method of using the pile driver.SOLUTION: A hydraulic circuit 61 includes: a ground circuit 71 branched from a telescopic circuit 63 between a hydraulic pump 62 and a control valve 60 for outrigger jack expansion and contraction switching via a solenoid switch valve 72; a relief valve 73 disposed in the ground circuit, which opens when the hydraulic pressure of the ground circuit exceeds a predetermined ground hydraulic pressure, and causes the telescopic circuit and a return circuit 65 to communicate with each other via the ground circuit; and a changeover switch 74 which switches the solenoid switch valve between a communication state in which the telescopic circuit and the ground circuit are caused to communicate with each other and a shutout state in which the telescopic circuit and the ground circuit are shut off from each other.SELECTED DRAWING: Figure 1
Inventors:
Tomita Youko
Nasu Hideaki
Nasu Hideaki
Application Number:
JP2020139754A
Publication Date:
September 08, 2021
Filing Date:
August 21, 2020
Export Citation:
Assignee:
Nippon Vehicle Manufacturing Co., Ltd.
International Classes:
E02F9/08; B60S9/12; B66C23/78; B66C23/80; E02D7/00; E02F9/22
Domestic Patent References:
| JP2007002440A | ||||
| JP2000272895A | ||||
| JP2011132912A | ||||
| JP2012148724A | ||||
| JP2010159148A | ||||
| JP11100192A |
Foreign References:
| US20040131458 |
Attorney, Agent or Firm:
Yoshihiko Kido
Kazuhiko Kido
Kazuhiko Kido