Tone arm damping device
US4305147A · kind A · utility
0Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Sep 18, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tone arm damping device which provides damping for both horizontal and vertical vibration forces utilizing a single damping mechanism. A gimbal-type support structure includes first and second rotatable bodies rotated respectively from a fixed shaft and from each other. The second or inner rotatable body has formed therein an annular reservoir of damping fluid. A fluted damping ring, attached through an adjustment mechanism to the fixed shaft, extends into the fluid reservoir. The extent of the damping ring into the fluid and hence the amount of the damping force may be set by the adjustment mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.