Power-assisted cart retriever with attenuated power output

  • US 7,389,836 B2
  • Filed: 09/23/2004
  • Issued: 06/24/2008
  • Est. Priority Date: 09/23/2003
  • Status: Active Grant
First Claim
Patent Images

1. A shopping cart retriever comprising:

  • an electric motor;

    a drive system powered by the electric motor;

    a controller that controls power to the electric motor and includes a first power limit and a second power limit; and

    a throttle control in communication with the controller, wherein the first power limit is the controller'"'"'s normal power limit that results when the controller self-limits its maximum power output through a sensing feature of the controller that exists to prevent damage to the controller,wherein the second power limit is selectable and limits the controller'"'"'s maximum power output to a level that is less than that of the first power limit, andwherein the sensing feature is a temperature sensing feature that senses a temperature of the controller.

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