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TORQUE-LIMITED CHAIN TENSIONING FOR POWER TOOLS

  • US 20110167650A1
  • Filed: 06/24/2009
  • Published: 07/14/2011
  • Est. Priority Date: 06/24/2008
  • Status: Active Grant
First Claim
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1. A chainsaw powered by a motor housed by a chainsaw body, the chainsaw comprising:

  • a cutting chain connected so as to be driven by the motor;

    a guide bar mounting stud extending from the chainsaw body;

    an adjustably connected guide bar having a track for supporting the cutting chain around a periphery of the guide bar, an adjustment pin extending from a side face thereof, and an elongated slot formed therein, wherein the guide bar mounting stud is configured to extend through said slot in the guide bar;

    a cam received on the guide bar mounting stud and having an eccentric groove facing the guide bar, wherein the adjustment pin is received in the eccentric groove such that rotation of the cam causes the guide bar to be positioned along its longitudinal dimension with respect to the chainsaw body, thereby tensioning the cutting chain; and

    a clutch connected to the cam for allowing no more than a predetermined load to be applied to the guide bar for tensioning the cutting chain.

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