Spring member for rotational action
US6997446B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2001 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Dec 20, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F1/025
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The rotational spring includes a base member which is in the form of a ring and includes elements for fixedly attaching it to a body of an appliance, such as a power toothbrush, which includes a drive element such as a drive shaft portion of a motor. Also included is an upper member in the form of a disc having a central opening through which the drive shaft is fitted, such that the disc member rotates with rotation of the drive shaft. Three leg members extend between the upper disc member and the base ring member. The spring is made from a material and is so configured and arranged that it has a symmetric spring rate for clockwise and counter-clockwise rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.