Patent ID: 7155832

Claim:
A chain saw including: an engine; an engine chassis supporting the engine; a clutch cover securable relative to the engine; a guide bar adjustable relative to the engine chassis and the clutch cover, the guide bar being stationary relative to the clutch cover and the engine chassis while in a secured position; a cutting chain extending along the guide bar and operatively connected to be driven by the engine; an adjustment arrangement for moving the guide bar to an adjusted position and tension the chain, the adjustment arrangement including a member operatively connected to the guide bar, a sequence of intermeshed drive components operable to cause movement of the guide bar, and a manually engaged member that is operated without use of any tool to cause operation of the intermeshed drive components and move the guide bar; a guide bar securing arrangement including a rotatable knob operatively cooperative with the engine chassis, the clutch cover, and the guide bar, wherein the knob can be rotated between a tightened position, in which the guide bar is tightened between the engine chassis and the clutch cover, and a loosened position, in which the guide bar is loosened and can be adjusted, and a knob handle, having an end portion pivotally connected to the knob, and a lock portion extending from the end portion, wherein the knob handle is pivotable between a stowed position and an operation position; and a lock arrangement associated with the knob and the knob handle, the lock arrangement including portions that cooperate to permit the knob to be rotated when the knob handle is in the operation position and prevent the knob from rotating when the knob handle is in the stowed position.