Browse Prior Art Database

Pressure Relief System for Disk Files

IP.com Disclosure Number: IPCOM000086116D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Wheeler, SE: AUTHOR

Abstract

This pressure relief system comprises a thin elastomer diaphragm or bellows 10 which seals the enclosure 12 for a magnetic disk 14, to compensate for changes in the relative pressure within enclosure 12 and that outside of enclosure 12.

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Pressure Relief System for Disk Files

This pressure relief system comprises a thin elastomer diaphragm or bellows 10 which seals the enclosure 12 for a magnetic disk 14, to compensate for changes in the relative pressure within enclosure 12 and that outside of enclosure 12.

Magnetic disk 14 is fixed on a hub 16 that in turn is fixed on a drive shaft 18. Spindle bearings 20 each having an air seal 21 rotatably mount shaft 18 to a disk file frame 22. Bellows 10 is fixed on the edges of an opening 24 provided in frame 22, and disk enclosure 12 is sealed with respect to frame 22.

As the pressure within enclosure 12 varies with respect to the pressure outside, bellows 10 contracts as shown in Fig. 2 or expands back again into its Fig. 1 position so as to compensate for pressure changes within and without enclosure 12, by expanding or contracting as the case may be.

Bellows 10, being an impervious membrane, becomes a complete seal against both moisture and particulate contamination in disk enclosure 12. Because of its flexibility, which can be controlled by the type of material and thickness, the bellows 10 presents much less air resistance than a conventional air filter usually used in place of bellows 10 while compensating for rapid pressure variations. Bellows 10 thus reduces air flow and any contamination through spindle bearings 20. Bellows 10 may be dip molded in high volume for many disk enclosures and thus inherently is of low cost.

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