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Method and apparatus for guiding a machine

  • US 5,652,593 A
  • Filed: 09/29/1994
  • Issued: 07/29/1997
  • Est. Priority Date: 09/29/1994
  • Status: Expired due to Term
First Claim
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1. A method for automatically guiding a self-propelled carpet cleaning machine moving within a room and including the steps of:

  • transmitting an airborne trigger signal of electromagnetic radiation from the moving machine to a stationary base module and, simultaneously with such transmitting, starting a counter on the machine;

    propagating, in response to the trigger signal, an acoustic locating signal from the base module to the machine;

    computing the distance between the base module and the machine; and

    using the computed distance to adjust the course of the machine along a raster path.

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