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:
Mar. 31, 1987
Filed:
Jan. 03, 1985
Applicant:
Inventors:
Chikahisa Kawakami, Tokyo, JP;
Tsuneo Suzuki, Tokyo, JP;
Assignees:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Computer Engineering Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 99 ; 360133 ;
Abstract
A floppy disc chucking device is provided for a floppy disc apparatus. The device comprises a permanent magnet for magnetically attracting a metallic chucking plate at the central portion of a floppy disc and a hub having a coupling surface closely in contact with the attracted chucking plate and rotated by a drive mechanism. The coupling surface of the hub is processed to form a coupling layer that has a predetermined thickness and a predetermined high hardness and provides a low coefficient of friction with the chucking plate in contact therewith.