Hilti Aktiengesellschaft

Hilti Aktiengeschaft

Hilti Akitengesellschaft

Erwin Manschitz

Helmut Burger

Markus Hartmann

Franz Popp

Ferdinand Kristen

Walter Wissmach

Josef Anzinger

Uto Plank

Franz Moessnang

Holger Cecchin

Stefan Hammerstingl

Manfred Ludwig

Harald Geiger

Armin Below

Christian Daubner

Manfred Ege

Christoph Kink

Mathias Doberenz

Hubert Daxenberger

Hans-Jürgen Pfisterer

Roland Schaer

Anton Neumaier

Udo Hauptmann

Werner Kaibach

Reinhard Schulz

Michael Selb

Josef Hunger

Josef Fünfer

David Hruza

Steffen Geiger

Peter Hellmann

Manfred Spieth

Germar Meiendres

Peter Hricko

Helmut Specht

Rudolf Bauer

Michael Schamberger

Karl-Heinz Gartner

Alexander Loeffler

Manfred Schallert

Antonios Draganis

Horst Stroissnigg

Hans-Juergen Pfisterer

Ralph Neuhauser

Matthias Kuemmerle

Josef Bauer

Franz Mössnang

Dirk Schinkitz

Vera Nuebel

Hans-Karl Moser

Jurgen Mundle

Bernd Gillmeier

Franz MÖSSNANG

Rainer Kussmaul

Alexander Löffler

Hans-Jürgen Horst Georg Pfisterer

Christoph Josef Kink

Ralf Neuhäuser

Ralph Neuhäuser

Michael Biedermann

Oswin Burtscher

A hand-held power tool, in particular a hammer drill or combination hammer, having a tool fitting for holding a striking and rotating tool on a working axis, an electric motor coupled to a transmission shaft, an impact mechanism, which has a striker that is moved periodically along the working axis, and having a rotary drive, which drives a guide tube carrying the tool fitting in rotation about the working axis, wherein the rotary drive is coupled to the transmission shaft via a rocker lever.

Hand-held power tool

A handheld power tool has a tool socket () to hold a tool () along a working axis (), a motor () and a slip clutch () having a number of blocking elements. A sensor () serves to record a measured signal () as the measure of vibrations inside the handheld power tool (). A band-pass filter () has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel () on the drive side and the number N of blocking elements (). The measured signal () filtered by the band-pass filter () is fed to an evaluation unit (). When the filtered measured signal () exceeds a limit value, the evaluation unit () reduces the rotational speed of the motor ().

Handheld power tool and control method

The control method for a hammer drill () provides the following steps. During basic operation, the motor () rotates at an operating speed for the drilling operation with chiseling action in order to rotationally drive the tool holder () and to drive the hammer mechanism () with a nominal striking power. The torque coupling () is monitored with the aid of a sensor (). If a disengagement of the torque coupling () occurs, the striking power of the hammer mechanism () is reduced to below 10% of the nominal striking power during a disengagement of the torque coupling (), and the torque coupling () is driven. When the disengagement of the torque coupling () ends, the striking power of the hammer mechanism () is increased to the nominal striking power and the torque coupling () is driven at the operating speed for the drilling operation with chiseling action.

Control method for a hammer drill

The torque coupling has a shaft, a hollow shaft and a plurality of levers. The bearings of the levers are non-rotatably connected to the shaft and the levers are spring-loaded so as to be pressed against the hollow shaft. The levers are bent from a steel strip.

Torque coupling

A pneumatic striking mechanism includes a guide cylinder in which a freely moving piston and an exciter piston are arranged movably along a striking axis. The guide cylinder has a plastic. The striking mechanism includes a pneumatic chamber sealed off by the guide cylinder, by the freely moving piston and by the exciter piston, as well as a drive for periodically moving the exciter piston, as a result of which the freely moving piston is excited to execute a periodical movement between the striking surface and the exciter piston.

Pneumatic striking mechanism and hand-held power tool

An oscillation damper () which is designed for being mounted on a housing () of a hand-held power tool () and includes an oscillating damping mass (); and at least one spring () located completely, with respect to its axial length, within the damping mass () for axially compressively preloading the damping mass () against the housing () of the power tool ().

Oscillation damper for a hand-held power tool

A pneumatically striking hand-held power tool is controlled by the following steps. An acceleration (a) along a striking axis () of the hand-held power tool () is detected. A driving power is reduced if the detected acceleration (a) is greater than a threshold value (A), the threshold value (A) being selected to be greater than maximum acceleration values (a, a) that occur on a workpiece during the striking operation of the hand-held power tool ().

Control method and hand-held power tool

A hand-held power tool includes a motor-driven percussion mechanism. The percussion mechanism includes a guide tube () and a reciprocating driving member () displaceable in the guide tube () for driving, via a gas spring, an impact member () likewise displaceable in the guide tube (). The percussion mechanism further includes a motor-driven eccentric wheel () rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X). A connection rod () is eccentrically supported on the eccentric wheel () and connected to the driving member () for converting a rotational movement of the eccentric wheel () into a reciprocating movement of the driving member ().

Hand-held power tool with a pneumatic percussion mechanism

An electrical tool includes a housing, a conductor channel, and a stranded conductor. The housing includes a motor, electronics, and drive gear. The conductor channel has a flexible section and a rigid section. The stranded conductor is in a receptacle of the conductor channel. One end of the stranded conductor is connected to a conductor of a network cable of the electrical tool. Another end of the stranded conductor is conductively connected with a component of the electrical tool.

Stranded wire retaining channel for an electrical tool

A chuck, which is releasably connectable with a tool spindle (), includes a guide sleeve () having a plurality of openings (), a plurality of locking elements formed as tilt segments () each having an axially fixedly supported, support part () and a radially tiltable locking part () extendable into a respective opening () of the guide sleeve () for engaging the tool spindle (), and a manually displaceable locking sleeve () for radially locking the locking elements.

Chuck

An electrical hand-held power tool includes a non-contacting electrical manual control switch () having an operating element () and a sensor switch (), a pivotable carrier () which carries a switching element () and which is manually controlled by the operating element () of the manually control switch (), the sensor switch () being connected with the carrier () vibration-free, and pivot transmitting device () axially displaceable along the vibration axis A) of a vibrating assembly () of the power tool relative to the operating element () for pivoting the carrier () in response to actuation of the operating element ().

Electrical hand-held power tool with non-contacting electrical manual control switch

An electrical hand-held tool includes an electric motor () having a rotor shaft () extending transverse to the tool percussion axis (A), a rotor sheet stack () supported on the rotor shaft, and a pinion () supported on the rotor shaft, a percussion mechanism () including an eccentric (), and a drive gear () engageable with the motor pinion () for driving the eccentric (), with the rotor sheet stack () being arranged, with respect to the percussion axis A, completely diametrically opposite the drive gear ().

Percussion electrical hand held tool

A hand-held electrical combination hammer drill capable of being used both as a drilling hammer and as a chisel hammer, and including an actuation member () for actuating an electrical on-off switch of the hammer drill and located on the tool handle switching elements () for switching between drilling and chiseling operations, stop elements () actuated by the switching means () for retaining the actuation member () in a on-position of the on-off switch upon selection of the chiseling operation, and a stop switch () having, upon selection of the chiseling operation, a first position in which the stop switch provides for securing the actuation member () in its on-position with the stop elements (), and a second position in which the stop elements occupies a non-operative position in which the actuation member, upon being released, automatically moves into its off-position under an action of a biasing force.

Hand-held electrical combination hammer drill

A vibration-decoupling arrangement for supporting a percussion unit () in a hand-held percussion power tool includes a spring () arranged between the percussion unit () and a tool housing () and preloaded against an engagement point (P) in the housing () for preventing vibrations of the percussion unit () from being transmitted to the housing (), and two axially spaced, flexurally deformable, articulated arms () secured in the housing () for supporting the percussion unit () in the housing (), with the arms () being secured in the housing () with a possibility of a limited axial displacement and without any slip motion relative to the housing.

Vibration-decoupling arrangement for supporting a percussion unit in a hand-held percussion power tool

Growing community of inventors

Germering, Germany

Erwin Manschitz