This invention provides with a construction machine having a front window-locking device comprising locking members (29) rotatably mounted on a window frame (28) of a front window (22) and adapted to secure the front window either in a closed position or i...

A power control apparatus has a generator power converting circuit (3) for converting power from a generator (2) to DC power to output the DC power to a direct-current line (8), a battery (4), chopper circuits (5, 7) for converting power from a capacitor (...

An anti-theft system for construction machines, comprising a memory which stores, as machine-side identification information, first identification information allocated construction machine by construction machine and second identification information allo...

The present invention discloses a traveling control device, including a crawler type right and left traveling body; a right and a left hydraulic motor (22,21) for operating the right and left traveling body using each hydraulic pump (24,23) as a hydraulic ...

A construction machine of the electric motor drive system capable of extending the service life of electric parts such as an electric motor by the simple constitution. In an excavator in which a hydraulic pump (16, 24, 26) is driven by an electric motor (1...

A generator (11) is driven by an engine (10) as a power source, a single electric motor (13) is rotated by power supplied from the generator (11), and operating parts of a lower traveling body, an upper rotating body and an excavating attachment are operat...

A drive apparatus comprises an engine, a hydraulic pump, an electric motor concurrently serving as a generator, a battery, a first control device that charges the battery with the electric power generated by the electric motor concurrently serving as a gen...