The present invention refers to a motor saw arrangement comprising a support plate attached to the motor saw chassis or motor saw motor, a detachable clamping plate and a detachable guide bar arranged between the support plate and the clamping plate. The support plate is provided with two first recesses and at least one threaded hole, while the clamping plate is provided with two protrusions adapted to fit inside the respective two first recesses when the clamping plates is attached to the support plate and the protrusions each have a height that exceeds a corresponding height of the guide bar. The guide bar is provided with two keyhole-shaped slots and with a longitudinal slit between the two keyhole-shaped slots and the support plate is further provided with an alignment means. The invention further relates to a method to remove and/or replace a saw chain from a guide bar and to a guide bar intended and adapted for the motor saw arrangement described herein.

The present invention refers to a motor saw arrangement comprising a support plate attached to the motor saw chassis or motor saw motor, a detachable clamping plate and a detachable guide bar arranged between the support plate and the clamping plate. The support plate is provided with two first recesses and at least one threaded hole, while the clamping plate is provided with two protrusions adapted to fit inside the respective two first recesses when the clamping plates is attached to the support plate and the protrusions each have a height that exceeds a corresponding height of the guide bar. The guide bar is provided with two keyhole-shaped slots and with a longitudinal slit between the two keyhole-shaped slots and the support plate is further provided with an alignment means. The invention further relates to a method to remove and/or replace a saw chain from a guide bar and to a guide bar intended and adapted for the motor saw arrangement described herein.

A battery (1800) for insertion into a battery compartment (150) of a hand-held work tool (100, 200), wherein the battery (1800) has a weight between 3-7 kg, and comprises a groove (1810) arranged on one side of the battery to mate with a corresponding supporting heel (1710) arranged on a wall of a battery compartment (150). The battery further comprises an upper ridge structure (1820) and a lower ridge structure (1830) arranged on an opposite side of the battery compared to the groove (1810), wherein the ridge structures (1820, 1830) are arranged to mate with corresponding dove-tail grooves (1720, 1730) of the battery compartment (150).

An electric working machine may include: an electrical component; a first space in which the electrical component is disposed; a partition wall separating the first space from a second space different from the first space, the partition wall including a first communication opening communicating the first space and the second space; and a first one-way valve disposed at the first communication opening.

A system assists during execution of a sequence of cuttings in a tree, wherein, during a cutting sequence, a first cut in the tree is followed by a second cut in the tree At least a part of an ideal course of the second cut depends on at least a part of a course of the first cut. An identification device identifies at least the part of the course of the first cut in the tree. A precalculation device precalculates at least the part of the ideal course of the second cut in the tree based on the identified part of the course of the first cut. An output device outputs cutting information for executing the second cut based on the precalculated part of the ideal course of the second cut.

Embodiments include a bar for a chain saw that is equipped with one or more oil channels that run along the length of the bar. Each oil channel receives oil at a first end, which exits the oil channel at an oil exit aperture at a second end of the channel. The oil exit aperture of one of the channels is positioned along the side of a bar groove, through which runs the saw chain, proximate to the cutting area of the bar to lubricate the saw chain just prior to the cutting area. A second channel may have an oil exit aperture proximate to the nose of the bar, to lubricate a sprocket wheel in the nose of the bar.

Embodiments include a bar for a chain saw that is equipped with one or more oil channels that run along the length of the bar. Each oil channel receives oil at a first end, which exits the oil channel at an oil exit aperture at a second end of the channel. The oil exit aperture of one of the channels is positioned along the side of a bar groove, through which runs the saw chain, proximate to the cutting area of the bar to lubricate the saw chain just prior to the cutting area. A second channel may have an oil exit aperture proximate to the nose of the bar, to lubricate a sprocket wheel in the nose of the bar.

A chain saw includes a connection rod and a front end assembly disposed at a front end of the connection rod. The front end assembly includes a motor, an output device, a transmission mechanism, and a front end casing. A ratio of rated output power P of the motor to a maximum weight of the chain saw is greater than or equal to 150 W/kg and less than or equal to 265 W/kg. The motor includes a rotor shaft, a rotor sleeve installed to the rotor shaft configured to rotate synchronously with the rotor shaft, a stator core disposed at least partially in the rotor sleeve, and a stator coil wound around the stator core.

A chain saw includes a connection rod and a front end assembly disposed at a front end of the connection rod. The front end assembly includes a motor, an output device, a transmission mechanism, and a front end casing. A ratio of rated output power P of the motor to a maximum weight of the chain saw is greater than or equal to 150 W/kg and less than or equal to 265 W/kg. The motor includes a rotor shaft, a rotor sleeve installed to the rotor shaft configured to rotate synchronously with the rotor shaft, a stator core disposed at least partially in the rotor sleeve, and a stator coil wound around the stator core.

A chain saw, arranged with a guide plate and a chain. The chain saw includes a housing, a drive assembly arranged in the housing, and a fixing assembly tensioning the chain and locking the guide plate. The fixing assembly includes a shield abutting against the guide plate, a knob arranged on an outside of the shield, a tensioning member driven by the knob, a locking member snapped to the shield, and an elastic member disposed between the knob and the locking member. A side of the shield facing the locking member is arranged with a first clamping part, and a side of the locking member facing the shield is arranged with a second clamping part; in condition of the guide plate being locked, the elastic member deforms and abuts against the locking member, causing the second clamping part to snapped to the first clamping part.