| 摘要 |
<p>TREE HARVESTING BLADE Tree shear blade having a forwardly tapering web portion and upper and lower rib portions provided on upper and lower web faces of the web portion. Cutting edge of web portion is defined as intersection of a lower bevelled face thereof with the upper web face. Upper rib portions are spaced along the blade and extend upwardly from upper web face and rearwardly from cutting edge with leading ends thereof having leading faces extending rearwardly from the cutting edge. Lower rib portions extending downwardly from lower web face and having leading ends with inclined rib leading faces extending rearwardly from and being coplanar with lower bevelled face. Upper and lower rib portions are both generally staggered relative to each other along the blade adjacent upper and lower rib portions so that outer portions of rib portions overlap each other to strengthen blade. Inclined lower bevelled face tends to direct shearing damage to stump of tree and away from butt of tree thus reducing losses resulting from splitting of tree. Blade is sharpened by grinding back lower bevelled face of web portion and occassionally leading edges of upper rib portions.</p> |
