| 摘要 |
Guide bar for saw chain, where the chain is supported by a nose sprocket while traversing the front end. Regions of the edges of the guide bar are locally hardened to a higher hardness than the rest of the guide bar. The regions of hardness are where the chain impacts the bar near an attachment end of the guide bar after having left the drive sprocket of the power socket, and where the chain settles on the guide bar edge after having been supported by the nose sprocket while traversing the nose curvature, where a cutting action occurs on the bar, but omitted in an area delineated from a point adjacent the oil holes at the attachment end to a point before where a majority of the cutting action occurs.
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