Method of making a cassette reel spring having rolled edges
US5079815A · kind A · utility
4Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Nov 9, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/496
- 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.