Patent · US Expired

Drive apparatus for recording disks in which the disk is clamped between a driven recessed member and a rotatably mounted clamping member

US4430678A · kind A · utility

4Cited by

2References

5Claims

0Family size

Assignee

BASF SE

Inventors

Joachim Hack · Ludwigshafen, DE
Roland Brotzler · Hochdorf-Assenheim, DE
Klaus Schulze-Berge · Ludwigshafen, DE
Rudolf Angermann · Offenburg, DE

Key dates

Filing date	May 1, 1981
Grant date	Feb 7, 1984
Priority date	—
Expiry date	May 1, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG11B17/03
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A drive apparatus for a recording disk, particularly a flexible magnetic disk in an envelope, comprising a rotatable clamping member which can be caused to engage one another, after the recording disk has been introduced therebetween, to clamp the disk for rotation thereof, in position between clamping surfaces of the two members. The clamping member is of axially expandable design and a resilient element is interposed between the face of the clamping member and the bottom of the recessed member so that the clamping member, prior to completion of its stroke and prior to its radial expansion, is engaged by the spring element. In this manner the spring element centers the position of the clamping member with respect to the recessed member and thereby insures clamping of the disk in its centered position.

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