Patent · US Expired

Pressure spring for tape cassettes and tape cassettes having said spring

US5042740A · kind A · utility

6Cited by

6References

19Claims

0Family size

Assignee

BASF SE

Inventors

Klaus Schoettle · Heidelberg, DE
Juergen Dreyer · Kehl, DE
Siegfried Riegger · Ettenheim, DE
Willi Schuhmacher · Kippenheim, DE

Key dates

Filing date	Mar 16, 1990
Grant date	Aug 27, 1991
Priority date	—
Expiry date	Mar 16, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG11B23/08728
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A pressure spring for tape cassettes which consists of a spring steel strip which is, in particular, narrow and is of roughly uniform width comprises a flat central part and curved spring arms adjacent to said part and having a continuous curve. The flat central part has, as fastening parts, holes with indented fastening collars which, together with rivet pegs and recesses in a housing wall, form a roughly projection-free spring fastening, the riveted peg ending roughly at the spring surface. The pressure spring exhibits a straight line with a defined slope in the operating region of its spring characteristic. The pressure spring can be used for tape cassettes of all types, in particular for video cassettes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.