Vehicle tracking, communication and fleet management system

  • US 20090088924A1
  • Filed: 11/20/2008
  • Published: 04/02/2009
  • Est. Priority Date: 12/19/1999
  • Status: Abandoned Application
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First Claim
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1. A sensor apparatus for producing a signal that indicates the speed and direction of a drum on a ready mix truck comprising at least one magnet mounted about the axis of rotation of the truck'"'"'s mixer drum, and dual magnetic field sensors mounted in fixed confronting relation thereto, wherein the magnet activates the sensors in sequence as the magnet passes in front of the sensors.

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