Rotary hammer
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United States of America Patent
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May 25, 2010
Grant Date -
Jan 15, 2009
app pub date -
Jul 11, 2008
filing date -
Jul 11, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotary hammer includes a housing, a tool holder mounted on a front portion of the housing, and a motor mounted in the housing. The motor includes an armature shaft arranged substantially perpendicular to an axis of rotation of the tool holder and including toothing. A hammer mechanism is driven by the motor to generate impacts on a tool being held by the tool holder. The hammer mechanism includes a first intermediate shaft adjacent and substantially parallel to the armature shaft facing away from the tool holder. A rotation drive mechanism is driven by the motor to rotatingly drive a tool being held by the tool holder. The rotation drive mechanism includes a second intermediate shaft adjacent and substantially parallel to the armature shaft facing the tool holder. The toothing of the armature shaft meshes with corresponding toothing on at least one of the first intermediate shaft and the second intermediate shaft. A chain drive couples the first intermediate shaft to the second intermediate shaft so that the first and second intermediate shafts are driven together by the armature shaft.
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