| 摘要 |
PCT No. PCT/AU83/00021 Sec. 371 Date Oct. 13, 1983 Sec. 102(e) Date Oct. 13, 1983 PCT Filed Feb. 16, 1983 PCT Pub. No. WO83/02916 PCT Pub. Date Sep. 1, 1983.A chain saw bar having a central groove along the top and bottom edges to guide the chain about the bar, and a bar nose structure at the end of the bar to guide the chain from the top edge to the bottom edge. The nose structure including an extension of the bar on one side of the groove and a roller rotatably mounted on the extension to form the other side of the groove at the nose of the bar. The roller and extension having arcuate peripheral faces to guide the chain about the nose of the bar.
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