ELECTRIC CONSTRUCTION MACHINE

Number of patents in Portfolio can not be more than 2000

United States of America Patent

APP PUB NO 20130318956A1
SERIAL NO

13989882

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Provided is an electric construction machine capable of avoiding a situation where charging is difficult to achieve due to the exhaustion of a battery device. An electrically-operated hydraulic excavator includes an electric motor, a hydraulic pump that is driven by the electric motor, hydraulic actuators that are driven by hydraulic fluid discharged from the hydraulic pump, and a battery device that serves as an electrical power source for the electric motor. The battery device includes battery systems that each have a plurality of batteries. A selector switch makes it possible to select either one of the battery systems. An arithmetic control section of an inverter device controls connection change switches through battery controllers to change the connections of the battery systems so that electrical power is supplied to the electric motor from either the battery system or the battery system, whichever is selected by the selector switch.

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTDBUNKYO-KU TOKYO 112-8563

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurikuma, Hajime Koka-shi, JP 14 94
Noguchi, Akira Koka-shi, JP 31 254
Takishita, Tatsuo Koka-shi, JP 14 63
Yunoue, Masayuki Koka-shi, JP 15 68

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