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LAWN MOWER

  • US 20120137643A1
  • Filed: 12/02/2011
  • Published: 06/07/2012
  • Est. Priority Date: 12/06/2010
  • Status: Active Grant
First Claim
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1. A lawn mower comprising:

  • an electric motor;

    a driving assembly coupled to and driven by said electric motor;

    a blade assembly coupled to and driven rotatably by said driving assembly;

    a battery for providing electricity to said motor;

    a switch unit electrically connected to said electric motor and said battery and operable between an open circuit state, in which electrical connection between said electric motor and said battery is broken, and a closed circuit state, in which electrical connection between said electric motor and said battery is made; and

    a detecting unit including a sampling resistor electrically connected in series with said battery, and a trigger circuit electrically connected in parallel with said sampling resistor and configured to control said switch unit according to detected voltage across said sampling resistor.

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