Mirka Ltd.

Oy Kwh Mirka Ab

Mirka Oy

Caj Nordström

Stig Finnäs

Göran Höglund

Tomas Södergård

Simon Bäck

Matias Nybacka

Tomas SÖDERGÅRD

A power tool includes a grinder, sander or a polisher, which has two working modes. According to an embodiment a dual power tool includes a motor operable in two operational directions, where an operational mode of the dual mode power tool is changeable by changing operational direction of the motor.

Dual mode power tool

An arrangement for cooling a spindle bearing or bearings of an abrading apparatus with rotating abrading members is disclosed. This is premised on arranging in a housing of the abrading apparatus conduits which extend from a spindle bearing chamber wall of the housing to an inner suction chamber wall of the housing. Via such conduits, hot air may be expelled from a spindle bearing chamber of the housing as an overpressure in front of a protruding balancer element of a rotating shaft balancer is discharged from the spindle bearing chamber via a conduit into a suction chamber. Cool air may be conveyed from a suction chamber into the spindle bearing chamber as an underpressure behind the protruding balancer element draws in air from the suction chamber via the conduit to the spindle bearing chamber.

Spindle bearing cooling arrangement in an abrading apparatus

The application concerns a cooling arrangement for a power tool and a power tool comprising the cooling arrangement. According to an aspect of the invention a cooling arrangement for a power tool comprises a housing of the power tool and electronics. The electronics include at least one circuit board and at least one electronic component. The electronics comprise at least one heat conductive area. The at least one heat conductive area is arranged to be heat conductively connected to the housing of the power tool.

Cooling arrangement for a power tool and power tool electronics

A power tool with a direct current, DC, power source comprising a controller for controlling a driver circuit driving a brushless motor in a power tool, the driver circuit being coupled to a direct current, DC, power source and including a first switching element pair coupled to a first phase winding of the brushless motor and a second switching element pair coupled to a second phase winding of the brushless motor; and the controller being arranged to alternately switch a first switching element of the first switching element pair and a second switching element of the second switching element pair, wherein the first switching element and the second switching elements are coupled to a respective terminal of the DC power source. A power tool comprising such a controller, and a method of controlling a driver circuit driving a brushless motor in a power tool.

Semi-symmetric switching

A handheld machine, comprising a first grip () for receiving a first hand of a user of the machine, a second grip () for receiving a second hand of the user of the machine, and at least one coupling () for connecting the handheld machine to a flexible line (). The second grip () extends in its usage position over the coupling () but is displaceable from this position.

Handheld machine

The present invention particularly relates to a hand-held sanding machine with an outer housing (), a tool shaft () and a brushless electric drive motor. In the present invention, the rotor of the drive motor is fastened to the tool shaft () of the sanding machine, and the stator () is positioned in the outer housing (). The present invention also relates to a control method for an electric sanding machine.

Growing community of inventors

Jeppo, Finland

Caj Nordström