CHAIN SAW TENSIONING DEVICE

摘要

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.