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Method and apparatus for manually applying a selected fit of a saw chain loop to a chain saw. A tensioning procedure is performed simply by loosening a guide bar hold-down screw. The loosened guide bar is slightly spaced away from the mounting plate of the chain saw as a spring extends the guide bar

Method and apparatus for manually applying a selected fit of a saw chain loop to a chain saw. A tensioning procedure is performed simply by loosening a guide bar hold-down screw. The loosened guide bar is slightly spaced away from the mounting plate of the chain saw as a spring extends the guide bar relative to a drive sprocket which tightens the saw chain. The hold-down screw, which has an inclined axis, is then tightened to force the saw bar obliquely toward the mounting plate, simultaneously forcing the guide bar in a longitudinal direction that backs off the saw chain tension by a predetermined amount.

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A chain saw having a rotatably driven drive shaft, a sprocket mounted on the drive shaft for rotation therewith, a guide bar positioned relative to the sprocket and cooperatively defining an endless guide way, and a saw chain loop mounted on said guide way to be driven by said sprocket around the en

A chain saw having a rotatably driven drive shaft, a sprocket mounted on the drive shaft for rotation therewith, a guide bar positioned relative to the sprocket and cooperatively defining an endless guide way, and a saw chain loop mounted on said guide way to be driven by said sprocket around the endless guide way, and mechanism for fitting the saw chain to the guide way comprising: a mounting member having a fixed relationship to the sprocket, a fastener for fastening the guide bar to the mounting member and being movable between first and second fastening positions, in said first fastening position said guide bar being slidable relative to said sprocket to extend the length of the guide way to the maximum length permitted by the length of the saw chain loop and in the transition of movement of the fastener to said second fastening position said guide bar being urged to a predetermined retraction of said guide bar relative to said sprocket.