Hitachi Construction Machinery Co., Ltd.

Katsuyoshi Nasu

Hajime Kurikuma

Tatsuo Takishita

Wataru Takagi

An electrically-operated construction machine with a battery charging operation. A lock switch provides a closed contact when a lock lever in a cab is placed in an unlock position. A feed port is disposed outside the cab to accept a cable from a commercial power source. The feed port is provided with a charge start switch. A control device has a motor control function for driving an electric motor with electrical power of a main battery when a signal is input from the lock switch. A charge control function is for charging the main battery with electrical power of the commercial power source when dictated by the charge start switch. The lock switch is wire-connected so as not to output the signal to the control device even if the closed contact is provided by the lock switch when the control device exercises charge control.

Electrically-operated construction machine

A construction machine that can limit consumption of battery electric power is provided. The construction machine includes: air-cooled heat exchangers; a cooling fanfor generating cooling air for the heat exchangers; a fan electric drive motorthat is driven by electric power of a batteryfor rotating the cooling fan; an inverter unitfor drivingly controlling the fan electric drive motor; a lock leverdisposed at a boarding-alighting port and configured to be operated into an unlocked position and a locked position; and a lock valvefor making an operation of an operating deviceor the like ineffective or the operating device inoperative when the lock leveris operated into the locked position. The inverter unitstops the fan electric drive motorwhen the lock leveris operated into the locked position.

Growing community of inventors

Konan, Japan

Katsuyoshi Nasu