Cassette reel spring having rolled edges
US4903916A · kind A · utility
5Cited by
2References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1989 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Jan 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/08728
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reel spring for a magnetic tape cassette is formed from a thin, elongated strip of stainless steel. The side edges of the strip are folded over by stamping or rolling to form longitudinal stiffeners. The stiffeners effectively increase the thickness of the strip at the edges, allowing the use of less expensive raw material without sacrificing functionality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.