FIELD: forestry; woodworking industry.
SUBSTANCE: invention relates to forestry and woodworking industry and can be used in devices for tensioning and adjusting the saw chain of the cutting chain apparatus of a motor saw. Working member of a portable chain saw, including a chain bar and a saw chain, as well as a saw chain tensioning and lubrication mechanism, characterized by that the saw chain tensioning device is made with oil inlet and outlet channels in the saw body, in which there are inlet and outlet safety valves, a rod rigidly connected to an adjusting screw, a sliding nut and a tensioner pivotally connected to the chain bar. At that, outlet safety valve is made with possibility to supply oil for lubrication of saw chain at tension of saw chain.
EFFECT: higher efficiency of automatic tensioning of saw chain with the secured chain bar.
1 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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RU2527553C2 |
