Control unit for a power tool
US9812930B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2016 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Apr 24, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2203/09
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power tool is provided including a housing; a brushless DC motor housed inside an upper body of the housing; a control unit housed inside a handle of the housing, the control unit comprising a micro-controller mounted over a control circuit board; and a variable-speed switch assembly including a main body mounted directly on a surface of the control circuit board, a trigger, a plunger linearly movable with the trigger with respect to the main body, a speed-sensing mechanism housed inside the main body and coupled to the plunger to generate a variable-speed voltage signal based on the position of the plunger, and at least one output pin connecting the speed-sensing mechanism of the variable-speed switch assembly directly to at least one conductive track on the control circuit board to provide the variable-speed voltage signal to the micro-controller via the at least one conductive track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.