Drilling and/or percussive hammer with no-load operation control

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United States of America Patent

PATENT NO 8235136
APP PUB NO 20100163260A1
SERIAL NO

11917988

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A drilling and/or percussive hammer comprises a handle and a hammer housing, which can move relative to the handle and inside of which, among other things, a pneumatic spring percussive mechanism is housed. The pneumatic spring of the pneumatic spring percussive mechanism can be ventilated via a no-load operation duct that is opened and closed by a valve. The valve can be opened and closed according to a pressing force acting upon the handle. A delay device controls the valve during closing so that the valve reaches the position corresponding to the detected pressing force only with a time delay. This causes a smooth transition from the no-load operation to the percussive operation.

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Patent Owner(s)

Patent OwnerAddress
WACKER NEUSON PRODUKTION GMBH & CO KG85084 REICHERTSHOFEN

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Berger, Rudolf Grunwald, DE 85 942
Schmid, Wolfgang Filderstadt, DE 173 1936

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