Robert Boschgmbh

Ulrich Single

Michael Habele

Klaus Dengler

Gerhard Meixner

Karl Frauhammer

Axel Kuhnle

Andreas Strasser

Martin Schulz

Dietmar Hahn

Erhard Hoffmann

Michael Maercker

Csaba Kreiter

Klaus Guenther

Andreas Heilmann

Gustav Sieber

Martin Lohner

The invention relates to a device () for taking a safety precaution in an electrical tool, said electrical tool comprising an electric motor (EM) with at least one field winding and an armature winding. The device () comprises the following features: a sensor unit () which is designed to generate a sensor signal () in accordance with a motor current () passing through the electric motor (EM), an armature voltage () via the armature winding, a voltage () via the field winding and/or a commutation frequency () in the armature winding; a unit () detecting a change of the sensor signal, which is designed to detect a temporal change of the sensor signal () and emit a corresponding modification signal () on the basis of the detected change; and a safety device () which is designed to take a safety precaution () in the electrical tool when a value of the modification signal () is exceeded or not met in relation to a threshold value.

Device and method for taking a safety precaution in an electrical tool

A portable power tool includes a tool housing, a motor unit located in the tool housing, and an electronic module located in the tool housing. The electronic module includes (i) an electronic module housing having at least one housing component, and (ii) at least one printed circuit board. The at least one printed circuit board is at least partially decoupled relative to the at least one housing component of the electronic module housing.

Electronic module

The invention relates to an electrical device having a switching unit, which is provided for switching a power supply of a consumer unit, and a control unit for controlling the consumer unit. According to the invention, the electrical device includes a bridging unit provided for supplying power to the control unit when the power supply is switched off by the switching unit.

Electrical appliance

A handle for an electric hand tool, which in use, is detachably connected to the hand tool as an auxiliary handle (), includes at least one detection device (), which communicates with at least one regulating and/or control element in the electric hand tool through a contactless signal transmission device.

Handle with detecting unit

An electric mains-connection device for an electric hand-held power tool equipped with an electric motor (M), in particular for an angle grinder, has mains-connection terminals for a mains-connection cable, and with an anti-interference capacitor; it is designed as a mains-connection module that can be actuated externally, includes mains terminals, houses the anti-interference capacitor, and out of which an electric cable extends, which serves to connect motor electronics and a motor switch in an interface-free manner. An electric device for an electric hand-held power tool equipped with an electric motor, in particular for an angle grinder, includes the electric mains-connection device.

Electric mains-connection device for an electric hand-held power tool

The invention relates to an electric power tool (), having an electric motor () that serves to drive a tool (). The electric power tool () is characterized in that a sensor unit () that detects the contact pressure of the tool () against a workpiece () cooperates with a signal transducer ().

Growing community of inventors

Penang, Malaysia

Ulrich Single