Patent ID: 9598839
Date: 2017-03-21
CPC Classifications: E02F,F15B

Claim:
1. A construction equipment comprising: a boom operating unit including a boom, a boom cylinder, a boom head return solenoid and a boom rod return solenoid, the boom head and rod return solenoids configured to control an extension of the boom cylinder to control an ascending and descending of the boom; a boom lever configured to generate a first signal for controlling a movement of the boom through the boom operating unit; an arm operating unit configured to control an arm, an arm cylinder and an extension of the arm cylinder to move the arm; an arm lever configured to generate a second signal for controlling a movement of the arm through the arm operating unit; an input device configured to output a third signal for initiating a boom float mode including: an arm-in mode in which the movement of the boom in ascending and descending directions is released while the arm moves inward, and an arm-out mode in which the movement of the boom in the ascending direction is released and in the descending direction is not allowed while the arm moves outward; and a control unit configured to output a flow path connection signal to at least one of the boom head return solenoid and the boom rod return solenoid to control the boom cylinder, and change the boom float mode from the arm-in mode to the arm-out mode or from the arm-out mode to the arm-in mode in accordance with a change of a manipulation direction of the arm lever in the boom float mode.