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Battery-driven working machine

  • US 5,991,677 A
  • Filed: 06/04/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 06/13/1996
  • Status: Expired due to Term
First Claim
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1. A battery-driven working machine comprising:

  • a working machine body;

    a battery mounted on said working machine body;

    an electric motor mounted on said working machine body and driven by electric power from said battery;

    a hydraulic pump mounted on said working machine body and operated by said electric motor;

    an actuator operated by working oil discharged from said hydraulic pump to operate a working member provided on said working machine body;

    a working machine moving means for moving said working machine body by electric power from said battery;

    an operating lever which is operable between a neutral position for stopping said working member and an operating position at which said working member is operated and when said operating lever is positioned at the operating position, working oil is supplied to said actuator;

    a battery capacity detection means for detecting the capacity of said battery; and

    an actuator operation limiting means for limiting an operation of said actuator and said working machine moving means by reducing the power supplied to said electric motor from a continuous application of power to a series of pulses when said operating lever is operated, in a case where a battery capacity value detected by said battery capacity detection means is at a level lower than a preset value and above a preset, lower limit value.

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