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:
Apr. 05, 2022
Filed:
Jun. 28, 2019
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Yuwei Yang, Nanjing, CN;
Junya Duan, Nanjing, CN;
Nanjing Chervon Industry Co., Ltd., Nanjing, CN;
Abstract
A power tool that is powered by a battery pack includes a function member, a motor, a motor driving circuitry, an energy storage component, an electromagnetic switch, and a power-off protection module. The electromagnetic switch includes a coil, a first switch electrically connected to the coil and configured to turn on and off an electrical connection between the coil and the battery pack, and a second switch electrically connected to the motor driving circuitry and configured to turn on and off an electrical connection between the battery pack and the motor driving circuitry. The power-off protection module is electrically connected to the coil and to the energy storage component and is configured to cut off an electrical connection between the coil and the energy storage in response to the power tool and the battery pack being electrically disconnected.