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Method and device for an overload detection in hand-guided power tools

  • US 8,018,182 B2
  • Filed: 07/17/2006
  • Issued: 09/13/2011
  • Est. Priority Date: 08/12/2005
  • Status: Active Grant
First Claim
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1. A method for detecting an overload situation in a battery-powered hand-guided power tool (10) equipped with an electric motor (12) and a DC battery pack (14) for supplying an operating current (IB) to the electric motor (12), in particular for a battery-powered hand-guided power tool (10), in which the operating current (IB) of the electric motor (12) is determined,wherein a difference (ID) between the value of the operating current (IB) and at least one stored current value (IG) is determined, in association with a maximum set point duration (ta), which maximum set point duration (ta) defines a maximum duration of said overload situation by taking into account an operating temperature (T0) of the hand-guided power tool (10), particularly at a moment at which the tool is switched on, and based on the difference (ID), a conclusion is drawn as to whether a thermal overloading of the power tool (10) is occurring.

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