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Method of vacuum adjustment in a cleaning machine

  • US 6,176,940 B1
  • Filed: 09/02/1998
  • Issued: 01/23/2001
  • Est. Priority Date: 12/24/1996
  • Status: Expired due to Fees
First Claim
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1. A method of adjusting a vacuum level in a carpet cleaning machine comprising:

  • providing the cleaning machine with a vacuum line;

    providing a vacuum sensor that senses the vacuum level in the vacuum line;

    providing a solenoid operated vacuum relief that vents air into the vacuum line; and

    controlling the vacuum relief with an electronically controlled control signal.

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