| 摘要 |
A chain saw has a spacer plate that provides an initial clearance space between an outer surface of an elongate flat blade that carries the cutting element of the saw and an inner surface of a recessed wall formed in a motor cover that forms a part of the chain saw housing when a pair of locking nuts are loosely seated against an outer surface of the recessed wall. When the locking nuts are firmly seated, the initial clearance space is reduced to no clearance space and the elongate flat blade is firmly held against vibration, but the light contact between the elongate flat blade and the recessed wall enables the elongate flat blade to be displaced in a first direction to loosen the cutting element and in a second direction, opposite to the first direction, to tighten the cutting element. This eliminates any need to loosen the locking nuts to accomplish cutting element adjustment. The spacer plate extends through an elongate slot formed in the elongate flat blade. The thickness of the spacer plate positions its outer surface above the outer surface of the elongate flat blade by about 0.001 inches. A cut out formed in the spacer plate provides access to a blade position adjustment member, and a tool is provided to engage the blade position adjustment member when the locking nuts are firmly seated against the spacer plate. The tool is permanently engaged to the blade position adjustment member so that the blade position and hence the chain tightness may be adjusted at any time in the absence of delay. The recessed wall is formed of a rigid but compressible material so that the clearance space is eliminated by the tightening of the locking nuts. The spacer plate reduces the amount of compression between the recessed wall and the elongate flat blade so that the elongate flat blade can be adjusted without loosening the locking nuts.
|
