Title:
CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2016188564
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide construction machine 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.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 via the ground circuit with each other; 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 out from each other.SELECTED DRAWING: Figure 1
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Inventors:
TOMITA YASUKIMI
NASU HIDEAKI
NASU HIDEAKI
Application Number:
JP2016023318A
Publication Date:
November 04, 2016
Filing Date:
February 10, 2016
Export Citation:
Assignee:
NIPPON SHARYO SEIZO KK
International Classes:
E02F9/08; B60S9/12; E02D7/00; E02F9/22; F15B11/028
Attorney, Agent or Firm:
Kazuhiko Kido
Yoshihiko Kido
Yoshihiko Kido