Patent ID: 8939699
Filing Date: 2015-01-27
Classification: E02F

Abstract:
1. A construction machine that drives a work attachment by a boom and an arm, comprising: a boom assist cylinder that assists an operation of the boom by a hydraulic pressure; an arm assist cylinder that assists an operation of the arm by a hydraulic pressure; an accumulator that accumulates operation oil to be supplied to said boom assist cylinder and said arm assist cylinder in a pressurized state; a first hydraulic pipe connected between said boom assist cylinder and said arm assist cylinder; and a second hydraulic pipe connected between said arm assist cylinder and said accumulator via said first hydraulic pipe, wherein said first hydraulic pipe is connected to a hydraulic connection port of said arm assist cylinder such that the operation oil is supplied in a direction of closing said arm from said accumulator to said arm assist cylinder, and wherein the first hydraulic pipe is connected to the boom assist cylinder such that the operation oil is supplied in a direction of opening said boom from said arm assist cylinder to said boom assist cylinder.