Motor driven hammer having means for controlling the power of impact
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jan 20, 2011
app pub date -
Jul 15, 2010
filing date -
Jul 15, 2009
priority date (Note) -
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Abstract
A motor driven hammer having a housing, a motor having a motor shaft and being arranged in the housing, a hammer mechanism including a cylinder in which a ram is arranged the ram being slidable along a longitudinal axis (L) of the cylinder, and a tool holder which may support a tool bit so that the tool bit is aligned with the longitudinal axis of the cylinder, wherein the motor is coupled with the hammer mechanism, so that rotation of the motor shaft results in a reciprocating movement of the ram within the cylinder, the ram applying impacts on a tool bit supported by the tool holder during the reciprocating movement. Further, the ram is made of a paramagnetic or ferromagnetic material or comprises a permanent magnet and a coil is arranged within the housing adjacent to the cylinder so that the coil applies a force in the direction of the longitudinal axis on the ram if a current is applied to the coil.
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