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Method and system for transporting inventory items

  • US 8,170,711 B2
  • Filed: 01/28/2011
  • Issued: 05/01/2012
  • Est. Priority Date: 06/09/2006
  • Status: Active Grant
First Claim
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1. A method for transporting inventory items, comprising:

  • moving a mobile drive unit to a first point while the mobile drive unit is docked with an inventory holder;

    determining a location of the inventory holder while the mobile drive unit is docked with the inventory holder;

    calculating a difference between the location of the inventory holder and the first point;

    determining whether the difference is greater than a predetermined tolerance;

    in response to determining that the difference is less than the predetermined tolerance, undocking from the inventory holder; and

    in response to determining that the difference is greater than the predetermined tolerance;

    moving the mobile drive unit to a second point based on the location of the inventory holder; and

    undocking the mobile drive unit with the inventory holder.

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