| 摘要 |
<p>This invention relates to a chain saw comprising an engine body on which a guide bar is arranged such that it can be moved in its length direction. The chain saw is provided with a saw chain tensioning device ( 16 ) which is operated manually without the aid of separate tools. The tensioning device comprises a screw ( 19 ) extending mainly parallel to the length direction of the guide bar. A chain tensioning nut is arranged on the screw such that the chain tensioning nut co-operates with the guide bar in order to tension the chain. The screw ( 19 ) is connected to the output shaft of a gear ( 20, 25 ) whose input shaft is connected to a tensioning wheel ( 26 ) accessible for manual adjustment from the outside of the chain saw without separate tools.</p> |
