US 12,186,929 B2
Chainsaw
Hideki Kachi, Anjo (JP); and Tsunahisa Nakamura, Anjo (JP)
Assigned to MAKITA CORPORATION, Anjo (JP)
Filed by MAKITA CORPORATION, Anjo (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,358.
Claims priority of application No. 2021-157163 (JP), filed on Sep. 27, 2021.
Prior Publication US 2023/0099820 A1, Mar. 30, 2023
Int. Cl. B27B 17/00 (2006.01); B23D 57/02 (2006.01); B23D 59/00 (2006.01); B27B 17/02 (2006.01); B27G 3/00 (2006.01)
CPC B27B 17/0008 (2013.01) [B23D 57/023 (2013.01); B23D 59/006 (2013.01); B27B 17/02 (2013.01); B27G 3/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A chainsaw comprising:
a saw chain;
a guide bar equipped with the saw chain;
a sprocket for running the saw chain along a periphery of the guide bar;
a prime mover configured to rotate the sprocket about a rotation axis;
a housing for housing the prime mover;
a sprocket cover for covering the sprocket; and
a guide member, wherein
the guide bar, the housing and the sprocket cover define a chain passage, the saw chain passing through the chain passage,
the guide member includes:
a first facing surface arranged such that the first facing surface faces the saw chain in the chain passage, the first facing surface having an arc shape centered on the rotation axis when viewed in a direction along the rotation axis; and
a second facing surface arranged such that the second facing surface faces the saw chain in the chain passage, the second facing surface having an arc shape centered on a position offset from the rotation axis when viewed in the direction along the rotation axis, and
when the chainsaw is placed on a horizontal resting surface and viewed in the direction along the rotation axis, an angle between (i) a straight line connecting the rotation axis and a position where the first facing surface and the second facing surface are connected and (ii) a horizontal plane is in a range of −10 degrees to 25 degrees.