Record players
US4257614A · kind A · utility
0Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1979 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Mar 15, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H9/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A speed change device for a record player which has a belt drive engaged with a drive pulley on the turntable and with a stepped pulley driver by an electric motor, having a pivotally mounted, belt engaging arm which is acted on by cam means to move the arm in a direction to move the belt outwardly of the stepped pulley, in a direction to move the belt along a path parallel to the axis of the stepped pulley and in a direction to move the belt transversely inwardly of the stepped pulley.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.