The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2010
Filed:
Feb. 13, 2007
Applicants:
Chih-hua Hsu, Taichung, TW;
Chen-chen Cheng, Taichung, TW;
Inventors:
Chih-Hua Hsu, Taichung, TW;
Chen-Chen Cheng, Taichung, TW;
Assignee:
Techway Industrial Co., Ltd., , TW;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25B 21/00 (2006.01);
U.S. Cl.
CPC ...
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.