Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 15, 2010
Patent Application Number
11705501
Date Filed
February 13, 2007
Patent Citations Received
Patent Primary Examiner
Patent 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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