US 11,673,287 B2
Systems and methods of chainsaw tensioning
Calvin Jone, Anderson, SC (US); Martin Lai, Anderson, GA (US); Chris Song, Roswell, GA (US); Andrew Ramsager, Atlanta, GA (US); John Huang, Atlanta, GA (US); and Anderson Duong, Fredrick, MD (US)
Assigned to Techtronic Cordless GP, Anderson, SC (US)
Filed by TECHTRONIC CORDLESS GP, Anderson, SC (US)
Filed on Nov. 10, 2021, as Appl. No. 17/523,873.
Prior Publication US 2023/0143254 A1, May 11, 2023
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)] 20 Claims
OG exemplary drawing
 
1. A chainsaw comprising:
a body including a bar stud extending therefrom;
a guide bar including a bar stud slot that receives the bar stud, wherein the bar stud slot has a length, and wherein the guide bar is configured to receive a chain;
a tensioning system comprising:
a yoke having a groove defining a length extending in a direction angularly offset from the length of the bar stud slot of the guide bar, wherein the yoke is coupled to the guide bar;
a ratchet gear including a one-way motion feature and a post extending into the groove of the yoke, wherein rotating the ratchet gear in a first direction moves the guide bar to tighten the chain, and wherein rotating the ratchet gear in a second direction moves the guide bar to loosen the chain; and
a pawl selectively engaged with the one-way motion feature of the ratchet gear, wherein the pawl permits rotation of the ratchet gear in the first direction, and wherein the pawl permits rotation of the ratchet gear in the second direction only when the pawl is selectively disengaged from the ratchet gear.