Power tools
US7053567B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2003 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Mar 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H5/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
It is an object of the invention to provide a technique to effectively prevent a power tool from being adversely affected when a battery is removed from the power tool. According to the present invention, a power tool is provided that includes a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body so as to supply driving current to operate the motor, a control device that controls the operation of the motor and a power circuit that leads the driving current from the battery to the motor. Within the power tool, the control device stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body in order to prevent a large driving current from being passed through the power circuit. As a result, arc can be effectively prevented from being generated between the battery and the body of the power tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.