The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 1988
Filed:
Jan. 29, 1985
Albert Dierkes, Planegg, DE;
Johann Biermeier, Munich, DE;
Wilhelm Brand, Rosenheim, DE;
Otto Olbrich, Taufkirchen, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A magnetic disk memory comprises a hub rotatably seated at both ends in a one-piece supporting shell of a housing and carrying at least one storage disk and driven by an internal drive motor. The hub is fixed on a rotating spindle, whereby a pair of ball bearings is provided for seating the spindle at mutually opposite walls of the supporting shell. The ball bearings are embraced in the axial direction in order to achieve a play-free spindle guidance. Each ball bearing has an inner ring fixed with an interference fit onto a respective end of the spindle and a respective bearing bushing likewise seated with an interference fit on its outer ring. One of the two bearing bushings is rigidly disposed in the allocated wall of the supporting shell and, in the incorporated condition of the hub, the other bearing bushing is fixed at the opposite wall of the supporting shell and is prestressed in the axial direction.