Abstract: Methods, nodes, a power tool and computer programs for and in a power tool (100) for enabling unlocking and locking of the power tool for prevention of unauthorized use, the method comprising receiving (S100) an unlock message to a control unit (210), the message including an instruction to unlock the tool (100), unlocking (S110) the power tool (100) according to the instruction by the control unit (210) via an actuator unit (250), counting (S120) an authorization time period from reception of the first message to the control unit (210) by a counter (230), wherein when the counted authorization time period exceed a predetermined threshold, locking (S130) the power tool (100) by the control unit (210) via the actuator unit (250), thereby enabling prevention of unauthorized use of the power tool (100) by remote unlocking and locking.

Abstract: A method in a mobile node for enabling determination of a position of a device. The method comprises receiving a positioning request message, including an identification of the device. The method further comprises transmitting an alert signal to the device, including the identification of the device. The method further comprises receiving a response signal from the device, including the identification of the device. The method further comprises calculating a distance or a direction to the device by measuring the received response signal, thereby enabling of determination of the position of the device.

Abstract: The invention is related to a device for the continuous mixing of lightconcrete comprising density decreasing particles, concrete and water, characterised by an elongated mixing chamber (1) in which a screw (4) is rotatably arranged around the central axis (5) of the cylinder (1). The screw is provided with two parts, a first transporting screw part (6) and a second combined transporting and mixing screw part (7). At the free end of the transporting screw part (6), a first feeding device (13) for the supply of density decreasing particles is arranged, and at the transition between the two different screw parts (6,7), a second feeding device (14) for the supply of a concrete/water mixture is arranged.

Abstract: A feeding device for materials that are difficult to feed, comprising an inlet (1), a hose pump (2) comprising a pump hose (11) which partly surrounds the circumference (13) of a pump wheel (12), which is provided with at least one pump cam (14), a feeding hose (4) arranged after the hose pump (2) and at least a first nozzle (3) arranged at the outlet of the hose pump (2) for supply of pressurized gas.