Torque-limited chain tensioning for power tools

A chainsaw powered by a motor housed by a chainsaw body, the chainsaw comprising:

• a guide bar mounting stud extending from said chainsaw body;
• a guide bar having an elongated slot formed therein for receiving said guide bar mounting stud, an adjustment pin extending from a side face thereof, and a track formed about the periphery thereof, said guide bar being longitudinally adjustable relative to said chainsaw body;
• a cutting chain at least partially positioned on said track of said guide bar, said cutting chain being drivable by the motor, wherein tension of said cutting chain is adjustable in response to longitudinal movement of said guide bar relative to said chainsaw body;
• a clutch rotatably connected to said guide bar mounting stud;
• and
• a cam rotatably connected to said guide bar mounting stud and positioned between said clutch and said guide bar, said cam having an eccentric groove formed into a surface adjacent to said guide bar, said adjustment pin being receivable and slidable within said eccentric groove;
• wherein rotation of said clutch causes said cam to rotate such that said adjustment pin slides within said eccentric groove to cause said guide bar to longitudinally move relative to said chainsaw body for adjusting said tension of said cutting chain, and wherein said clutch is slippable relative to said cam to prevent said cutting chain from having more than a predetermined tension therein.