Browse Prior Art Database

Plastic Rigid Seal to Trap Airborne Submicron Particles

IP.com Disclosure Number: IPCOM000086523D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Trotter, VJ: AUTHOR

Abstract

Disk file 10 utilizes a rigid plastic washer 12 (e.g., MYLAR*) disposed about spindle shaft 14 for preventing very small airborne submicron particles from entering the disk file.

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Plastic Rigid Seal to Trap Airborne Submicron Particles

Disk file 10 utilizes a rigid plastic washer 12 (e.g., MYLAR*) disposed about spindle shaft 14 for preventing very small airborne submicron particles from entering the disk file.

Disk file 10 comprises disk 16 which is fixed to shaft 14 by disk hub 17. Shaft 14, which is rotatably mounted in base casting 18 by bearings 20 and 22, is driven from any suitable power source by pulley 23, which is fixed on the lower end of shaft 14 for rotating disk 16. Disk 16 is enclosed by a clear plastic cover 24 which lies on base casting 18.

Seal 24 is provided between casting 18 and disk hub 17 to restrict air flow through the spindle assembly into the interior of cover 24. It thus prevents airborne particles from reaching the interior of cover 24 and the surfaces of disk
16. Plastic plate seal 12 fits on a shoulder 18a formed in casting 18 and has an interference fit with the outer diameter of spindle shaft 14. The outer diameter of seal 12 is retained by four spring washers 26, which are disposed between bearing 22 and seal 12.

Air tends to flow in path 28 through bearing 22 and around shaft 14 to the interior of cover 24. However, seal 12 prohibits such movement of air from carrying with it a substantial number of particles of .3 micron or larger, thereby maintaining the surfaces of disk 16 clean for consistent data transfer. * Trademark of E. I. du Pont de Nemours & Co.

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