InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database


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



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

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Page 1 of 4


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...