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.

A lubrication system for a chainsaw, the lubrication system including a reservoir housing a lubricant; a fluid conduit extending between the reservoir and a location adjacent to a chain of the chainsaw; a pump configured to move lubricant from the reservoir to the location adjacent to the chain; and a valve disposed along the fluid conduit, the valve having a lubricant inlet that receives lubricant from the reservoir, an air inlet, and an outlet that provides lubricant to the location adjacent to the chain, wherein the valve is movable between an open position whereby lubricant passes from the lubricant inlet to the outlet and a closed position whereby the outlet is in fluid communication with the air inlet, and wherein the valve moves between the open and closed positions in response to a user input.

A lubrication system for a chainsaw, the lubrication system including a reservoir housing a lubricant; a fluid conduit extending between the reservoir and a location adjacent to a chain of the chainsaw; a pump configured to move lubricant from the reservoir to the location adjacent to the chain; and a valve disposed along the fluid conduit, the valve having a lubricant inlet that receives lubricant from the reservoir, an air inlet, and an outlet that provides lubricant to the location adjacent to the chain, wherein the valve is movable between an open position whereby lubricant passes from the lubricant inlet to the outlet and a closed position whereby the outlet is in fluid communication with the air inlet, and wherein the valve moves between the open and closed positions in response to a user input.

A chainsaw includes a housing having a handle housing portion, a motor housing portion, and a drive housing portion. The handle housing portion has a longitudinal axis that defines a first axis of the chainsaw. The chainsaw also includes a motor having an output shaft with a longitudinal axis that defines a second axis of the chainsaw, a driven gear coupled to the output shaft, a sprocket coupled to the driven gear, and a guide bar extending from the drive housing portion and having a longitudinal axis that defines a third axis of the chainsaw. A chain is supported on the guide bar and engaged with the sprocket. The first axis, the second axis, and the third axis are generally coplanar, and the first axis and the second axis define a first included angle between about 75 degrees and about 95 degrees.

A chainsaw includes a housing having a handle housing portion, a motor housing portion, and a drive housing portion. The handle housing portion has a longitudinal axis that defines a first axis of the chainsaw. The chainsaw also includes a motor having an output shaft with a longitudinal axis that defines a second axis of the chainsaw, a driven gear coupled to the output shaft, a sprocket coupled to the driven gear, and a guide bar extending from the drive housing portion and having a longitudinal axis that defines a third axis of the chainsaw. A chain is supported on the guide bar and engaged with the sprocket. The first axis, the second axis, and the third axis are generally coplanar, and the first axis and the second axis define a first included angle between about 75 degrees and about 95 degrees.

Disclosed is a new type of dosing device in a tree-processing device and a method for using it. The dosing device comprises a pump (2) to be attached to the processing device and a feed hose (15) connected to the pump (2) for leading the treatment agent fed by the pump (2) to the point of use. In the device is a replaceable treatment-agent cartridge (7) and the treatment-agent cartridge contains treatment agent. The cartridge is attached to the inlet port of the pump (2) by means of an adapter (4).

Disclosed is a new type of dosing device in a tree-processing device and a method for using it. The dosing device comprises a pump (2) to be attached to the processing device and a feed hose (15) connected to the pump (2) for leading the treatment agent fed by the pump (2) to the point of use. In the device is a replaceable treatment-agent cartridge (7) and the treatment-agent cartridge contains treatment agent. The cartridge is attached to the inlet port of the pump (2) by means of an adapter (4).

A cutting assembly of a chainsaw includes a saw chain and a guide bar (4) for guiding the saw chain (3) along a peripheral edge (5) of the guide bar. The saw chain (3) has drive links (6) having drive bases (7) which with their side surfaces (8, 8′) are slidingly guided between the side walls (9) of a guide groove (10) of the guide bar (4) with the formation of a friction pairing. Lubricant pockets (11) are formed in the side surface (8). The lubricant pockets (11) are only open toward the corresponding side wall (9) of the guide groove (10) and are otherwise closed. Offside the lubricant pockets (11), the side surface (8) has a flat sliding surface (12) which slides on the side wall (9) of the guide groove (10). The lubricant pocket (11) has a mean diameter and a maximum depth. The ratio of the mean diameter to the maximum depth lies in a range of 5.0 up to and including 25.0.

A motor chain saw has a first driven sprocket wheel driving a saw chain lubricated via a supply pump driven by first and second drive wheel, wherein the second drive wheel is connected to the first sprocket wheel. A drive element with coupling section is connected to the first sprocket wheel and the second drive wheel is formed on the drive element. A second sprocket wheel can be used in place of the first sprocket wheel. The first and second sprocket wheels have different geometries. The coupling section has first and second followers correlated with follower surfaces of the first and second sprocket wheels. The coupling section contacts with first followers the follower surfaces of the first sprocket wheel or with second followers the follower surfaces of the second sprocket wheel when used in place of the first sprocket wheel.