US 11,772,295 B2
Chain saw and method for tensioning a saw chain of a chain saw
Lars Bathke, Rudersberg (DE)
Assigned to Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed by Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed on Oct. 11, 2021, as Appl. No. 17/498,541.
Claims priority of application No. 20201376 (EP), filed on Oct. 12, 2020.
Prior Publication US 2022/0111551 A1, Apr. 14, 2022
Int. Cl. B27B 17/14 (2006.01); B27B 17/02 (2006.01); B27B 17/08 (2006.01)
CPC B27B 17/14 (2013.01) [B27B 17/02 (2013.01); B27B 17/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A chain saw comprising:
a housing;
a saw chain;
a chain drive sprocket;
a guide bar defining a guide groove and a longitudinal axis;
said saw chain being configured to be guided in said guide groove;
a drive motor configured to drive said saw chain in a revolving manner via said chain drive sprocket;
said guide bar having a longitudinal plane defined by said guide groove;
a tensioning device;
a releasable fastening arrangement configured to hold said guide bar on said housing;
said guide bar being displaceable via said tensioning device in relation to said housing in a direction of the longitudinal axis of said guide bar when said releasable fastening arrangement is released;
a chain lifting device configured separately from said tensioning device;
said chain lifting device, when in a deflected position, being configured to deflect said saw chain when said tensioning device tensions said saw chain;
said chain lifting device, when in an operating position, being configured to relax said saw chain when said guide bar is fixed; and
said chain lifting device including a deflection element configured to act on said saw chain.