| 摘要 |
<p>The tightness of the saw chain on the guide bar of a chain saw is adjustable by means of a tool-rotatable member which extends to the outside of the drive case cover and is connected through helical gears with an adjusting screw mounted in fixed location adjacent a rear end portion of the guide bar for rotation about an axis extending lengthwise of the guide bar. An internally threaded rider on the adjusting screw is interconnected with the guide bar so as to move the guide bar lengthwise when the rider is moved by rotation of the adjusting screw. The location of the rotatable member by which the adjusting screw can be rotated makes it possible to adjust the tightness of the chain on the guide bar conveniently and safely.</p> |
