Hilti Aktiengesellschaft

Markus Forstner

Michael Fuchs

Helmut Burger

Armin Hoffmann

Stefan Ringler

Holger Cecchin

Oliver Koslowski

Klaus Hauser

Georg Braml

Stefan Mayer

David Koscheck

Egon Koenigbauer

Manfred Jakob

Stefan Groer

Michael Candussio

Martin Zacher

Josip Matanovic

Egon KÖNIGBAUER

A hand-held power tool, including: a drive circuit for providing an adjustment signal as a function of actuation of a button, a control apparatus for adjusting a drive current for an electric motor of the hand-held power tool as a function of the adjustment signal, wherein the control apparatus is connected to an electrical energy source for operating the hand-held power tool via a first electrical line arrangement, the drive circuit is connected to the control apparatus via a second electrical line arrangement, a drive current line carrying the drive current for the electric motor is routed via an interruption switch, coupled to the button, for interrupting the drive current, and wherein an interference-suppression capacitor is connected to the drive power line via a first node and to the second electrical line arrangement via a second node.

Hand-held power tool

Rechargeable battery for a machine tool containing at least one energy storage cell and also one switching apparatus. The rechargeable battery contains a bypass circuit which can be operated in a first and second mode, wherein the bypass circuit is in an inoperative state in the first mode, so that an electric current with a first current value passes from the at least one energy storage cell to the machine tool via the switching apparatus, and wherein the bypass circuit is in an operating state in the second mode, so that an electric current with a second current value passes from the at least one energy storage cell to the machine tool via the bypass apparatus, and wherein the first current value is greater than the second current value. The bypass circuit contains a comparator for comparing a current value which is required by the machine tool with a stored current threshold value, so that, via switching element, the bypass circuit is switched to the first mode when the current value which is required by the machine tool exceeds the threshold value and the bypass circuit is switched to the second mode when the current value which is required by the machine tool falls below the threshold value.

Bypass circuit at a rechargeable battery

An electric handheld power tool, including a data memory and a data interface signal-connected to the data memory, via which tool-related data may be read out from the data memory with the aid of a terminal, the data interface including a system antenna for wireless radio data transmission, and the electric handheld power tool including an amplifier antenna which is different from the system antenna, the amplifier antenna being magnetically coupled with the system antenna and preferably mounted on or in the direct vicinity of the system antenna.

Handheld power tool and amplifier antenna

A method to control a power tool (), especially a handheld core drilling machine, includes a drive () to drive a tool () and a control unit () for when a workpiece (W) is being processed. The method encompasses the following method steps: The power tool includes a drive () to drive a tool () and a control unit () to control at least the rotational speed of the drive.

Intuitive, adaptive drilling function

A hand-held power tool is disclosed with a measuring system for determining an effective value of an alternating voltage which is fed via an external conductor with respect to a neutral conductor. A regulated direct voltage source has a power supply potential which is referenced to the neutral conductor. There is a first resistance value from the power supply potential to a tap and a second resistance value from the tap to a ground. A voltmeter has a measurement range and its measurement input is connected to the tap. A measurement line connects the tap to the external conductor. The first resistance value is lower than the second resistance value such that the mean voltage value on the tap is equal to the mean of the measurement range for one period of the alternating voltage.

Measuring arrangement for measuring an effective value of an AC voltage in a handheld power tool

A brush holder () for a motor and having a plate-shaped base body () having an opening () for passing the motor rotor () therethrough, at least one brush receptacle () in which a carbon brush () is displaceably received, and an electronics can () projecting from the plate-shaped base body (), closed at its side () adjacent to an axis (A) defined by the base body opening (), and having an inner chamber () in which at least a portion of components of control electronics is received.

Brush holder

Growing community of inventors

Landsberg, Germany

Markus Forstner