Browse Prior Art Database

Atmospheric Pressure Compensator for Disk Files

IP.com Disclosure Number: IPCOM000089324D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Wheeler, SE: AUTHOR

Abstract

The compensator comprises thin flexible diaphragm 10 which is disposed in tubular portion 12 of disk file frame 14. Diaphragm ID compensates for changes in the relative pressure within disk file enclosure 16 and that outside of enclosure 16 by rolling upwardly and downwardly within frame portion 12 as the relative pressure changes.

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Atmospheric Pressure Compensator for Disk Files

The compensator comprises thin flexible diaphragm 10 which is disposed in tubular portion 12 of disk file frame 14. Diaphragm ID compensates for changes in the relative pressure within disk file enclosure 16 and that outside of enclosure 16 by rolling upwardly and downwardly within frame portion 12 as the relative pressure changes.

Magnetic disk 18 is fixed on hub 20 that, in turn, is fixed on drive shaft 22. Spindle bearings 24, each having an air seal 26, rotatably mount shaft 22 with respect to disk file frame 14. Diaphragm 10 is considerably longer when stretched out than the length of the inner cylindrical cavity 12a of tubular portion 12, and has about the same diameter as cavity 12a so that diaphragm 10 has an upwardly extending portion 10a hugging the wall of cavity 12a and has a downwardly extending portion 10b substantially in contact with portion 10a. Diaphragm 10 has a radially extending flange 10c, and flange 10c is maintained in contact with a lower annular surface 14b of frame 14 by means of retainer ring
28. Retainer ring 28 has outwardly extending tabs 28a, and these engage with a cylindrical surface 14a of frame 14 for folding flange 10c in tight contact with surface 14b. Diaphragm 10 thus seals cavity 12a which otherwise is in communication with both enclosure 16 and with the atmosphere outside of enclosure 16.

In operation, when the pressure within disk enclosure 16 varies with respect to atmosph...