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 method for operating a saw assembly as well as a saw assembly, having a chainsaw (1) with a circulating saw chain (2) and a chain drive sprocket (3) for driving the saw chain (2). The chainsaw (1) is secured to a moving device (8) via a chainsaw swivel device (19). The moving device (8) has a first operating mode, in which the chainsaw (1) is moved or movable from a first position through a saw area (9) and through the cutting material (18) into a second position, and the moving device (8) has a second operating mode, in which the chainsaw (1) is moved or movable from the second position back through the saw area (9) and through the cutting material (18) into the first position.

A method for operating a saw assembly as well as a saw assembly, having a chainsaw (1) with a circulating saw chain (2) and a chain drive sprocket (3) for driving the saw chain (2). The chainsaw (1) is secured to a moving device (8) via a chainsaw swivel device (19). The moving device (8) has a first operating mode, in which the chainsaw (1) is moved or movable from a first position through a saw area (9) and through the cutting material (18) into a second position, and the moving device (8) has a second operating mode, in which the chainsaw (1) is moved or movable from the second position back through the saw area (9) and through the cutting material (18) into the first position.

A chainsaw including 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 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.

A chainsaw including 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 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.

An electric work machine is driven appropriately. An electric work machine includes a motor including a stator, a rotor rotatable relative to the stator, and a rotor shaft fixed to the rotor, an output unit drivable by the rotor shaft, a plurality of heat-radiating fins, a motor case having an outer surface receiving the plurality of heat-radiating fins and accommodating the stator and the rotor, a cooling fan located outside the motor case and rotatable by the rotor shaft, and a duct including a guide to guide air through the cooling fan to a fin passage between adjacent heat-radiating fins of the plurality of heat-radiating fins.

A chain saw includes a housing, an electric motor, a transmission system, a control system including a circuit board assembly, and a power supply assembly. The circuit board assembly obliquely intersects with a first straight line; in a direction of a second straight line perpendicular to a direction of the first straight line and extending along an up and down direction, the electric motor has a projection surface and the circuit board assembly has a projection surface, the projection surface of the electric motor at least partially overlaps the projection surface of the circuit board assembly. In the direction of the first straight line, the power supply assembly has a projection surface and the circuit board assembly has a projection surface, and the projection surface of the power supply assembly at least partially overlaps the projection surface of the circuit board assembly.

A chain saw includes a housing, an electric motor, a transmission system, a control system including a circuit board assembly, and a power supply assembly. The circuit board assembly obliquely intersects with a first straight line; in a direction of a second straight line perpendicular to a direction of the first straight line and extending along an up and down direction, the electric motor has a projection surface and the circuit board assembly has a projection surface, the projection surface of the electric motor at least partially overlaps the projection surface of the circuit board assembly. In the direction of the first straight line, the power supply assembly has a projection surface and the circuit board assembly has a projection surface, and the projection surface of the power supply assembly at least partially overlaps the projection surface of the circuit board assembly.

An electric work machine is driven appropriately. An electric work machine includes a motor including a stator, a rotor rotatable relative to the stator, and a rotor shaft fixed to the rotor, an output unit drivable by the rotor shaft, a motor case accommodating the stator and the rotor, a magnet located inside the motor case and rotatable by the rotor, and a magnetic sensor located inside the motor case to detect the magnet.

A chainsaw including 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 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.