Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2007-02-13
2010-06-15
Hail, III, Joseph J (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057110, C081S057130, C081S057140, C081S057290, C081S467000, C081S469000
Reexamination Certificate
active
07735398
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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Cheng Chen-Chen
Hsu Chih-Hua
Hail, III Joseph J
Hershkovitz Abraham
Hershkovitz & Associates LLC
Scruggs Robert
Techway Industrial Co., Ltd.
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