Chain saw having an improved chain tensioning device

Chain saw having a base body and a chain sword for guiding a chain, said chain bar in the base body by a bolt and is fixed to this fitting nut, and with a rotary element for manual axial displacement of the chain sword with respect to the base body, which acts on a helical . characterized, that on the outer side of the base body (3; 33) is a lever (17; 45) is mounted, about a parallel to the chain bar (5; 31) extending pivot axis between a folded-away position and an extracted position to pivot about the axis of rotation of the nut (11 ; 39) is rotatable and thereby axially adjustable, wherein the nut is a hexagonal nut (11; 39) and a hexagonal nut (11; 39) facing the end of the lever (17; 45) one (the hex nut 11; 39) adapted hexagonal has, in the extracted position of the lever (17; 45); receiving opening (41 13) is engageable in the direction of the base body (3) and on the hex nut ...