Hilti Aktiengesellschaft

Hilti Aktiengellschaft

Georg Braml

Helmut Burger

Oliver Ohlendorf

Reinhard Riedl

Stefan Ringler

Ernst-Rudolf Lübkert

Markus Forstner

Frank Fritsch

Thomas Pritzen

Antonios Draganis

Florian Mayr

Ralph Abel

Ernst-Rudolf LÜBKERT

Thomas Schäfer

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

A hand-held power tool has a tool holder for holding a tool, an electric motor for driving the tool holder, and a handle for holding and guiding the hand-held power tool. A button has a button housing, a pin that can be moved on an actuation axis, and an electric slider which is connected to the pin and which slides on an electric slider track. The button housing is suspended in the handle in such a way that the button housing can be pivoted about a pivot axis perpendicular to the actuation axis.

A universal motor () includes at least two carbon brushes () contacting the commutator (), a ventilation device () for producing a cooling flow (K), and a dust protection arrangement for preventing penetration of material particles (M) into the commutation region () and including at least one guide member () that provides for delivering of the material particles (M) in the cooling flow (K), with the at least one guide member () having a smooth concave guide surface () located between the two carbon brushes () and extending adjacent to an outer surface () of the commutator () and toward a suction opening () connected with the cooling flow path ().

Universal motor with a device for removing dust

A brush mounting plate for a universal motor includes U-shaped brush guiding plates () for radially guiding carbon brushes () and having radially offset guiding plate feet () which extend through associated mounting holes () formed in the brush mounting plate (), with at least two guiding plate feet () being spaced at different distances from respective adjacent end surfaces () of an associated brush guiding plate ().

Brush mounting plate with brush guiding plates

A turning-pivoting commutating rotary switch () with brush guides () for reversing the direction of rotation of a universal motor, which has two stator contacts () each making contact with a contact rail () running partially peripherally at at least one contact point (), which are conducting connected with the two diametrically opposing brush guides (), wherein a contact rail () with two contact points () extends over at least a half periphery and wherein both stator contacts (), at which at least one contact point () can be rotatably switchable at a contact rail () running partially peripherally, are arranged on only one side of the stator ().

Commutating rotary switch

Growing community of inventors

Landsberg, Germany

Georg Braml