Electric screwdriver
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United States of America Patent
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Dec 25, 2007
Grant Date -
N/A
app pub date -
Dec 15, 2006
filing date -
Dec 15, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An electric screwdriver capable of reducing the reactive force produced on the occasion of a screw tightening work, etc. The electric screwdriver is designed to transmit the rotational driving force of a first motor to the bit through a bit holder, and it includes a flywheel rotatively driven by a second motor in the direction same as the direction of rotation of the bit holder, a brake generating a reactive force in the direction offsetting the reactive force transmitted from the bit to the body casing through the bit holder, by braking the flywheel, and a brake operating mechanism for operating the brake in response to the magnitude of the reactive force transmitted from the bit to the body casing through the bit holder.
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