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US 2002/0000325 A1Published application
Hand-held hammer drill
OwnerGunnar Wijk, Diethard Fohr +1inventors
InventorsGunnar Wijk, Diethard Fohr, Alexander Krug
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OwnerGunnar Wijk, Diethard Fohr +1inventors
InventorsGunnar Wijk, Diethard Fohr, Alexander Krug
Estimating the term…
A hand-held hammer drill has a housing and an electric drive motor arranged in the housing. A tool spindle is arranged in the housing and configured to receive a tool. The tool spindle can be driven in rotation by the electric drive motor. The tool spindle has a longitudinal axis and is oscillatingly moveable in a direction of the longitudinal axis. A hammer mechanism is provided to move the tool spindle oscillatingly in the direction of the longitudinal axis. A hydraulic drive is arranged in the housing and configured to drive the hammer mechanism. The hydraulic drive has a hydraulic pump generating a hydraulic pressure for driving the hammer mechanism.
A hand-held hammer drill comprising:
The hammer drill according to claim 6, wherein said second end (13) is continuously loaded with a high hydraulic pressure and wherein said first end (12) is loaded oscillatingly with a high hydraulic pressure and a low hydraulic pressure.
Dependencies are inferred from the claim text.