Rechargeable motor-driven ratchet wrench having power-off protection
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United States of America Patent
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Jun 15, 2010
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app pub date -
Feb 13, 2007
filing date -
Feb 13, 2007
priority date (Note) -
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Abstract
A rechargeable motor-driven ratchet wrench having power-off protection of the present invention includes a motor, a rechargeable battery and a power-off protection device. When the loaded current of the motor exceeds a set default value of a reference circuit, the power-off protection device disconnects the power supply of the rechargeable battery, so as to stop the motor operation. With the circuit design of the power-off protection device, the ratchet wrench can be ensured to provide usage safety and also usage lifespan of the ratchet wrench can be extended.
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