Chain saw
AssigneeRobert Bosch GmbH
InventorsEgbert Steinbrueck, Juergen Dolata
Life of this patent
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Abstract
In a chain saw having a sprocket (11), which is supported in rotary fashion in a housing (10) and is for a saw chain (12) guided on a guide (13), and having a chain tension device (14) for longitudinally moving the blade (13), which device has a cam (15) that moves the guide (13) and a rotating member (17) for rotating the cam (15), in order to preset a chain tension that is optimal for operation and is independent of the user, the rotary connection between the rotating member (17) and cam (15) is embodied as a detent overload clutch (18), whose detent overload force is set in accordance with the required chain tension (FIG. 2).
Claims10
A chain saw having a housing (10) having a sprocket (11) supported in the housing (10) for the motor-powered driving of a saw chain (12), having a guide (13) protruding from the housing (10), which continuously guides the saw chain (12) engaging the sprocket (11) along its blade edge and which, in order to stretch the saw chain (12) tight, is secured to the housing (10) so that it can be moved longitudinally in a direction that increases the distance to the sprocket (11), and having a chain tension device (14) that has a cam (15), which is supported against a stop (16) fixed to the guide (13) and produces a longitudinal movement of the guide (13), and has a rotating member (17) for rotating the cam (15), characterized in that the rotary connection between the rotating member (17) and cam (15) is embodied as a detent overload clutch (18), whose detent overload force is set in accordance with the required chain tension of the saw chain (12).
Dependencies are inferred from the claim text.