Husqvarna Ab

Johan Berg

Magnus Rosén

Lars Freidlitz

Joakim Leff-Hallstein

Pär Madbro

Ulf Johan Petersson

Bengt A Bergvall

Pär Carlsson

Anders Erestam

Håkan Pinzani

Adam Vidlund

Anders Bennehag

David Dufke

Victor Johansson

Ulf Pettersson

Johan Linnér

Johan Persson

Bengt Allan Bergvall

A hand-held electrically powered cut-off tool () for cutting concrete and stone by a rotatable cutting disc (), the cut-off tool () comprising an electric motor () arranged to be controlled by a control unit () via a motor control interface (), wherein the control unit () is arranged to obtain data indicative of an angular velocity of the cutting disc (), and to detect a kickback condition based on a decrease in angular velocity, and wherein the control unit () is arranged to electromagnetically brake the electric motor () in response to detecting a kickback condition.

Hand-held electrically powered cut-off tool with a kickback mitigation function

The present invention relates to a floor surfacing machine () comprising a frame () that is carried by a first wheel () and a second wheel (). The floor surfacing machine () further comprises a first motor (), a handle arrangement (), at least one planetary head () that is rotatably mounted to the frame () and at least one satellite surfacing head () that is rotatably mounted to the planetary head (), where the first motor () is arranged to propel the planetary head (). The floor surfacing machine () comprises a first control unit (), and a remote control panel () which in turn comprises a second control unit () that is arranged to communicate with the first control unit (). The floor surfacing machine () also comprises a second motor () that is arranged to propel the satellite surfacing heads () such that the planetary head () and the satellite surfacing heads () are independently operable.

Floor surfacing machine

A construction site status monitoring device is provided including processing circuitry configured to receive sensor data from a sensor associated with a construction device including a working element, determine a presence of a density gradient in a working material based on the sensor data, and cause an automatic response relative to operation of he working element based on the determination of the presence of the density gradient.

Construction site device for determining the presence of a density gradient in a working material

A construction site status monitoring device is provided including processing circuitry configured to receive construction device location data associated with a construction device, receive worker location data associated with a worker, and determine a safety condition based on the construction device location data and the worker location data.

Device for determining construction device and worker position

The present invention relates to a safety arrangement for a floor surfacing machine () comprising at least one drive wheel (), a motor arrangement () for propelling said drive wheel (), a surfacing apparatus () and a control unit () for controlling the operation of said motor arrangement () and said surfacing apparatus (). The arrangement comprises at least one detecting unit () connected to said control unit () and adapted for determining a torque required for operating each drive wheel () wherein said control unit () is configured for preventing operation of said surfacing apparatus () if said required torque is lower than a predetermined limit value. The invention also relates to a method for obtaining safety in a floor surfacing machine ().

Safety arrangement and method for a floor surfacing machine

A construction site status monitoring device is provided including processing circuitry configured to receive teaching data from a construction device in a teaching mode based on an operator performing an operation with the construction device and generate an operation profile based on the teaching data for execution by one or more construction devices. The operation profile defines parameters associated with the operation to enable one or more construction devices to repeat the operation in an operate mode.

Teaching mode for construction devices

Disclosed herein is a liquid system tool having an integrated residual current device, RCD. The liquid system tool comprises a current circuit having a power input for receiving an alternating electrical current, AC, a rectifier for rectifying the AC into a direct current, DC, a voltage booster for increasing a DC voltage and a motor unit connected to an output of the voltage booster for driving the liquid system tool. The RCD comprises a sensor element connected to an output of the rectifier and an input of the voltage booster and being configured to collect an analog current signal and an analog to digital, A/D, converter configured to convert the analog current signal into a digital current signal. The integrated RCD further comprises a logic unit connected to the A/D converter, wherein the logic unit is configured to evaluate the digital current signal and compare it to a current requirement, and wherein if the logic unit determines that the digital current signal does not fulfill the current requirement, it is further configured to break the current circuit so that no current can flow in the liquid system tool. Also disclosed is a method for detecting residual current in a liquid system tool, and a computer program product.

Liquid system tool having an integrated residual current device

An electric power saw/cutter includes a rotatable saw structure, a rear handle with a switch/speed control, a front handle, and a drive unit for rotating the saw structure. The drive unit includes a saw structure drive arrangement to which the saw structure is attachable, a transmission for driving the saw drive arrangement, an electric motor for driving an input shaft of the transmission, and a support structure for holding/carrying the saw structure drive arrangement. The transmission and the electric motor may be characterized in that the front handle and the rear handle are directly connected to each other to form a handle unit, which unit is resiliently connected to the drive unit, so that vibrations from the saw blade and drive unit will be reduced in the handle unit.

Electric cutting system

The present invention relates to a floor surfacing machine comprising a frame that is carried by a first wheel and a second wheel. The floor surfacing machine further comprises a first motor, a handle arrangement, at least one planetary head that is rotatably mounted to the frame and at least one satellite surfacing head that is rotatably mounted to the planetary head, where the first motor is arranged to propel the planetary head. The floor surfacing machine comprises a first control unit, and a remote control panel which in turn comprises a second control unit) that is arranged to communicate with the first control unit. The floor surfacing machine also comprises a second motor that is arranged to propel the satellite surfacing heads such that the planetary head and the satellite surfacing heads are independently operable.

An electric power saw/cutter includes a rotatable saw structure, a rear handle with a switch/speed control, a front handle and a drive unit for rotating the saw structure. The drive unit itself including a saw structure drive arrangement to which the saw structure is attachable, a transmission for driving the saw drive arrangement, an electric motor for driving an input shaft of the transmission, and a support structure for holding/carrying the saw structure drive arrangement, the transmission and the electric motor. The front handle and the rear handle are directly connected to each other to form a handle unit, which unit is resiliently connected to the drive unit, so that vibrations from the saw blade and drive unit will be reduced in the handle unit.

Growing community of inventors

Alingsås, Sweden

Johan Berg