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:
Oct. 20, 1992
Filed:
Jul. 31, 1990
Tetsuyuki Hishikawa, Tokyo, JP;
Yoshiji Kitamura, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic disk drive includes a spindle for rotating a plurality of magnetic disks and a lock mechanism for preventing the spindle from rotating when the magnetic disk drive is not operated. A toothed disk is provided on an axial end of the spindle, and a movable lock arm engageable to teeth of the toothed disk is provided. The lock arm is driven to lock the rotation of the spindle by a solenoid which is energized after a predetermined period of time has elapsed after the electric power of the disk drive is turned off, so that the lock mechanism locks the spindle after the rotation of the spindle and magnetic disks completely stop.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile