Hilti Aktiengesellschaft

Christian Daubner

Markus Hartmann

Frank Kohlschmied

Erwin Manschitz

Hubert Daxenberger

Ferdinand Kristen

Walter Wissmach

Holger Cecchin

David Hruza

Christoph Kink

Michael Schamberger

Hans-Juergen Pfisterer

Ralph Neuhauser

Josef Bauer

Hans-Jürgen Horst Georg Pfisterer

Christoph Josef Kink

Ralf Neuhäuser

A power tool is disclosed. The power tool includes a striker, a guide tube in which the striker is guided along an axis, and a pneumatic chamber, which is closed by the striker, the guide tube and a valve device actuated by its own medium. A volume of the pneumatic chamber changes in the case of a movement of the striker along the axis. The valve device has a swivelable sealing element between the striker and the guide tube. The swivelable sealing element is swiveled into a retracted position when the striker moves in the impact direction and is swiveled into an extended position when the striker moves against the impact direction. In the retracted position, the sealing element has a first inflow surface. In the extended position, the sealing element has a second inflow surface. The second inflow surface is larger than the first inflow surface.

Power tool

A power tool and control method is disclosed. The power tool has a striker, which is guided along an axis parallel to an impact direction. A pneumatic chamber has a volume which varies with a movement of the striker along the axis. A valve device that is actuatable depending upon the movement direction of the striker connects the pneumatic chamber with an air reservoir. The valve device is actuated to open in the case of a movement of the striker in the impact direction and in the case of a movement of the striker against the impact direction is actuated to throttle or close. The throttled or closed valve device restricts an air flow flowing through it to a maximum of one tenth of the value as compared to the air flow in an opened position.

Power tool and control method

A power tool is disclosed. The power tool has a striker, which is guided along an axis in a guide tube. A pneumatic chamber has a volume which varies with a movement of the striker. The pneumatic chamber is closed by the striker, the guide tube and a valve device. The valve device has in a flow channel a sealing element that is moveable between two positions in a bearing along the axis. The flow channel has a first cross-sectional area in a first of the two positions of the sealing element adjacent to a first mating surface of the bearing, and the flow channel has a second cross-sectional area in a second of the two positions of the sealing element adjacent to second mating surface of the bearing offset from the first mating surface along the axis. The second cross-sectional area is greater than the first cross-sectional area.

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 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

Mammendorf, Germany

Christian Daubner