A battery compartment battery lock mechanism (700) comprising a locking member (710) rotatably supported on a shaft (720) and comprising a leading edge portion (750) arranged to enter a recess (760) formed in a battery (220) to lock the battery in position, The leading edge portion (750) has an arcuate form with a curvature corresponding to that of a circle segment with radius corresponding to the distance from the leading edge portion (750) to the center of the shaft (720) The recess (760) formed in the battery (220) comprises a surface (770) arranged to engage the leading edge portion (750), wherein the surface (770) has an arcuate form to match that of the leading edge portion (750). The invention further comprises an electrically powered hand-held work tool comprising such a battery lock mechanism.

A handheld work tool comprising a cutting tool (130), an electric motor (140) having a rotational axis and being arranged to drive the cutting tool (130), a battery compartment (150) for a battery (220) arranged to power the electric motor (140), a support arm (240) and a belt guard (115). The support arm (240) is arranged to support the circular cutting tool (130) on a first end (241) of the support arm, and to support the electric motor (140) at a second end of the support arm (242), opposite to the first end (241). The belt guard (115) and at least a part of the support arm (240) are configured to enclose an interior space (340), where the hand-held work tool (100, 200, 800, 1000) comprises a fan (145), configured to generate a flow of cooling air. A portion of the flow of cooling air is arranged to be guided via at least one opening (310) into the interior space (340), thereby increasing an air pressure in the interior space (340) above an ambient air pressure level.

A hand-held electrically powered cut-off tool (100, 200, 800, 1000, 1900, 2300) comprising a fan (145) arranged to be driven by an electric motor (140) to generate a flow of cooling air (160) and a battery compartment (150) comprising an electrical storage device (220, 1800), such as a battery, arranged to power the electric motor (140), wherein a cooling air conduit is arranged to guide the flow of cooling air (160) towards an outlet aperture (1750) formed in a wall of the battery compartment (150), where the outlet aperture (1750) faces a corresponding inlet aperture (1870) formed in an enclosure of the electrical storage device (220, 1800) for receiving cooling air and thereby generating an air pressure above atmospheric pressure in the electrical storage device (220, 1800), wherein a first slot section (Ss1) is formed by a distance between the outlet aperture (1750) and the inlet aperture (1870) such that a first portion (2415) of the flow of cooling air (160) air leaks out to an exterior of the cut-off tool via the first slot section (Ss1).

A concrete saw is disclosed and includes a frame having a platform and a leg pivotably coupled to the platform at a pivot axis, at least two rear wheels coupled to the platform at the pivot axis, at least one rear wheel coupled to an end of the leg distanced from the pivot axis, a power and drive assembly disposed on the platform, wherein the power and drive assembly includes an electric motor and a battery pack coupled to the electric motor to provide direct current power to the electric motor, and a cutting assembly driven by the power and drive assembly to cut a groove in a work surface as the concrete saw is moved across the work surface.

A support arm (240) for a hand-held work tool (100, 200, 800, 1000), the work tool comprising an electric motor (140) arranged to drive a circular cutting tool (130). The support arm (240) is arranged to support the circular cutting tool (130) on a first end (241) of the support arm, and to support the electric motor (140) at a second end of the support arm (242) opposite to the first end (241). The support arm (240) is arranged to at least partially enclose the electric motor (140).

A hand-held electrically powered cut-off tool (100, 200, 800, 1000, 1900, 2500) comprising a first part (110) and a second part (120) arranged vibrationally isolated from each other, the first part (110) comprising an interface (2510) for holding a cutting tool (130) and an electric motor (140) arranged to drive the cutting tool, wherein the first part is associated with a first mass (M1), the second part (120) comprising a battery compartment (150) for holding an electrical storage device (220) arranged to power the electric motor (140) as well as front (190) and rear (195) handles for operating the cut-off tool, wherein the second part is associated with a second mass (M2), wherein the electrical storage device (220) is associated with a third mass (M3), and wherein the cutting tool is associated with a fourth mass (M4), wherein a ratio of the second mass (M2) to the sum of the first and second masses (M1+M2) is at least 0.3, and preferably more than 0.35; wherein a ratio of a sum of the second and the third mass (M2+M3) to the sum of the first and fourth masses (M1+M4) is at least 0.6, and preferably more than 0.8 and even more preferably more than 1.0; wherein a ratio of a sum of the second and the third mass (M2+M3) to the sum of the weight of the entire device including electrical energy storage and cutting disc, is at least 0.45, and preferably more than 0.5.

The present invention relates to a laying machine for laying at least one flexible casing or tube, cable or wire including: a blade arrangement for making a trench in the ground, a consolidation and laying means being arranged behind the blade arrangement, for clearing and safe-guarding the trench from collapsing while laying at least one flexible casing or tube, cable or wire into the trench. A blade assembly comprising compartments for cooling fluid and air.

The present invention relates to a laying machine for laying at least one flexible casing or tube, cable or wire including: a blade arrangement (2) for making a trench (5) in the ground, a consolidation and laying means (3) being arranged behind the blade arrangement (2), for clearing and safeguarding the trench (5) from collapsing while laying at least one flexible casing or tube, cable or wire into the trench. A blade assembly comprising compartments for cooling fluid.

The present disclosure relates to a hand-held power tool (1) comprising a rotatable work tool (2) with a center (16) and a circumference (17) and having a direction of rotation (19). The power tool (1) further comprises a blade guard arrangement (8) that is arranged to shield a variable part of the rotatable work tool (2) and comprises a blade guard (12) and a swiveling cover part (11, 11′, 11″) attached to the blade guard (12). In a first position, the swiveling cover part (11, 11′, 11″) is positioned such that a first arc (A) of a circle is covered, following the blade guard (12), and running an angular distance along the circumference (17) after the blade guard (12), in the direction of rotation (19). The cover part (11) is moveable between the first position and a second position where a cutting operation of the rotatable work tool (2) along the first arc (A) of a circle is allowed. The cover part (11, 11′, 11″) is biased towards the first position. The present disclosure also relates to blade guard arrangements.

A method is provided for operating a hand-guided processing device that has a rotating and/or circulating cutting tool, an electric motor drive system wherein the electric motor drive system is configured for generating a torque for driving the cutting tool, and a user-operable control element. The method automatically monitors whether a blocking criterion is fulfilled, wherein the blocking criterion is characteristic of a blocking of the cutting tool, and if the blocking criterion is fulfilled and the control element operated, automatically lowers the torque generated by the electric motor drive system, and temporally thereafter, automatically increases the torque generated by the electric motor drive system.