Browse Prior Art Database

COMPLIANT CLAMP FOR MINIATURE DISK DRIVES

IP.com Disclosure Number: IPCOM000029733D
Original Publication Date: 2004-Jul-09
Included in the Prior Art Database: 2004-Jul-09
Document File: 4 page(s) / 201K

Publishing Venue

IBM

Abstract

An inexpensive compliant clamp for ultra low profile PCMCIA type II and type III disk drives is disclosed.

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COMPLIANT CLAMP FOR MINIATURE DISK DRIVES

The requirements for high preload, low thermal shift, and low curvature distortion are well met with the current heat shrink ring design for large form factor drives (65 mm and 95 mm drives). Such a solution is not suitable for 45 mm drives. Four reasons can be mentioned:
lack of axial space (low profile) heat shrink rings provide high radial forces which have tendency to affect the running accuracy of bearing if mounted on the same wall
low cost difficulty of rework due to miniaturization of a design suited for larger size application.

       Alternative clamp designs include clamp designs tied down with a multitude of screws. The process of positioning and fastening the screws does not lend itself for low cost mass production

       The proposed solution requires the use of a compliant material such as polymer based materials. Compliant polymer-based materials are readily available with good thermal behavior, low susceptibility to humidity, and low outgassing. These materials offer very attractive solution to meeting the requirements of designing clamps for small form factor drives.

       The solution proposed uses a clamp that has two parts: (1) a circumferential lip (or ear) that snaps to the spindle to secure the clamp in place and (2) a footprint that provides a multitude of clamping functions, i.e., axial and/or radial clamping depending on the particular application, by creeping of the compliant material

       The clamp shown in Fig. 1 is engaged by applying a uniform axial preload causing the lip (to...