Automatic working vehicular system

  • US 4,919,224 A
  • Filed: 05/09/1988
  • Issued: 04/24/1990
  • Est. Priority Date: 05/16/1988
  • Status: Expired due to Fees
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First Claim
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1. An automatic working vehicular system comprising:

  • (1) a guiding signal device comprising;

    a signal generator for generating a plurality of alternating currents having at least three different frequencies;

    a first wire carrying an alternating current at a first frequency, said first wire loops from said signal generator at a parking location to a first corner of a job site and along one side of the job site to a second corner thereof and back to said signal generator;

    a second wire carrying an alternating current at a second frequency, said second wire loops from said signal generator at the parking location and around an external circumference of the job site and back to said signal generator;

    a third wire carrying an alternating current at a third frequency, said third wire loops from said signal generator at the parking location and around an external circumference of each barrier area located within the job site; and

    (2) an automatic working vehicle comprising;

    a frame having a front end, a rear end, and two sides;

    a travelling mechanism for turning said frame and moving said frame forwards, backwards, and sideways;

    a dynamic source for driving said travelling mechanism;

    an electric power source for storing and supplying a required power;

    a timer for providing a starting signal enabling said vehicle to begin operating at a desired time;

    a plurality of wire sensors for sensing a signal from said guiding signal device and producing a wire location signal;

    a distance measuring device for measuring a distance between said vehicle and obstacles and producing an obstacle signal;

    a margin sensor mounted for sensing a boundary location between an already operated area and a non-operated area and producing a boundary location signal;

    a microcomputer, having stored control programs, for controlling the operation of said vehicle;

    wherein said vehicle starts automatically when it receives said starting signal, and according to said guiding signal device, travels from the parking location to the job site, operates over the job site in a parallel reciprocating manner, and returns to the parking location.

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