| 摘要 |
<p>A chain saw bar (34, 16) has an elongated shape, a saw chain guideway around substantially the length of the perimeter thereof and a matching saw chain sprocket (18) in the nose (16) thereof. There is a region (52, 54) of calculated variation in strength in the interior of the bar at a location removed from the sprocket (18), so that if the bar is subjected to an excessive bending force in use, the bar will tend to become bent at about the region of variation in strength.</p> |
