Makita Corporation

Tsunahisa Nakamura

Hideki Kachi

Koji Haneda

A chainsaw may include a saw chain; a guide bar, a sprocket, a prime mover, a housing, a sprocket cover, and a guide member. The guide bar, the housing and the sprocket cover may define a chain passage. The guide member may include a first facing surface having an arc shape centered on the rotation axis and a second facing surface having an arc shape centered on a position offset from the rotation axis. When the chainsaw is placed on a horizontal mounting 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 may be in a range of −10 degrees to 25 degrees.

Chainsaw

The description herein discloses a chainsaw, which may include: 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 motor including an output shaft connected to the sprocket; a cooling fan connected to the output shaft; and a base member for holding the guide bar. The base member may be constituted of a heat conductive material having a thermal conductivity of 10 W/m·K or more when a temperature of the heat conductive material is 300 K. The base member may include: a plate portion arranged such that the plate portion faces the motor in a direction along the output shaft; and a rib portion protruding from the plate portion toward the motor.

A chainsaw includes a handle with a handgrip; an electric motor for endlessly moving a saw chain; a control unit for controlling rotation of the motor; and a main power switch switchable between an ON state and an OFF state. The handgrip is provided with a gripping detection device for detecting whether the handgrip is gripped by the worker, and the chainsaw is configured to, when the control unit is manipulated to deactivate the electric motor in a state in which the gripping detection device detects that the handgrip is gripped, maintain the main power switch in the ON state, and to, when the control unit is manipulated to deactivate the electric motor in a state in which the gripping detection device detects that the handgrip is not gripped, switch the main power switch to the OFF state.

Growing community of inventors

Aichi, Japan

Tsunahisa Nakamura