Nodal mounted system for driving a power appliance
US7627922B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2007 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Oct 15, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C17/3418
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The power toothbrush, which has a rotating brushhead movement, includes a housing with a motor mounted therein having an armature which in operation rotates through an arc of predetermined magnitude. The toothbrush also includes a brushhead mounted on a shaft which is connected to an output mass. A spring assembly couples the armature to the output mass, the spring assembly including two spring portions with a node point therebetween, wherein when the armature rotates, the brushhead moves in an opposite direction. The frequency of the movement of the armature is set equal to the resonant frequency of the spring coupling system and the output assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.