| 摘要 |
<p>A saw chain (10) is assembled with wear links (26) for improving the resistance of saw chain to abrasion from the saw bar. In one embodiment, the wear links (26) are mounted one beside each steel side link (16, 18) in the chain and are constructed to ride along the outer surfaces (19, 21) of a pair of parallel rails (22, 23) upon which the side links also ride as the chain is driven around the bar (12). The wear links (26), however, are formed of a material that better resists abrasion than steel but consequently has less tensile strength. To assure that the tensile load on the chain is assumed by the steel side links (16, 18) while the chain is supported on the bar (12) by the wear links (26) the wear links have oblong pin openings (28, 30) of the same height (B) but of greater length (A) than the circular openings of the side links (16, 18). In a second embodiment, the wear links are mounted on both sides of each drive link rather than beside each side link.</p> |
