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:
Jul. 14, 1998
Filed:
Apr. 01, 1997
Kazuo Honma, Kanagawa-ken, JP;
Hitachi Electronics Engineering Co., Ltd., Tokyo, JP;
Abstract
A disk chuck mechanism of the present invention reliably chucks a disk on an upper end surface of a cylinder by providing a short rod penetrating the cylinder, coupling a circular plate and a plate member to opposite ends of the rod, providing a biasing member such as coil springs for biasing the rod in the direction in which the rod is moved away from the cylinder, pulling the rod down from the cylinder by biasing force of the biasing member to expand a ring member having a diameter smaller than an annular groove and to fit it in the annular groove, to thereby uniformly press a side surface of a center opening of the disk with an outer peripheral surface of the cylinder.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile