Patent ID: 8833045
Filing Date: 2014-09-16
Classification: A01D,H02H

Abstract:
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; wherein said switch unit includes: wherein one of said first and second contact members is configured to be moved by said movable magnet to make or break electrical contact with the other one of said first and second contact members.