Browse Prior Art Database

External Closure of Bistable Pack

IP.com Disclosure Number: IPCOM000085855D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Barbeau, RA: AUTHOR [+2]

Abstract

A pack of multiple floppy-type disks 1 receives a critical internal pressure, through not shown axial passages, which permits the pack to rotate in a closed stable configuration and to be split by a small "triggering" force into a stable separated configuration, as shown in Fig. 1. The split can be formed at any interface in a range of multiple disk interfaces. The split area 3 forms an enlarged space for receiving a not shown head transportable externally relative to the disks.

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External Closure of Bistable Pack

A pack of multiple floppy-type disks 1 receives a critical internal pressure, through not shown axial passages, which permits the pack to rotate in a closed stable configuration and to be split by a small "triggering" force into a stable separated configuration, as shown in Fig. 1. The split can be formed at any interface in a range of multiple disk interfaces. The split area 3 forms an enlarged space for receiving a not shown head transportable externally relative to the disks.

The usual method of closing a "bistable" pack of this type is to momentarily increase the internal air pressure above the critical bistable threshold. An alternative technique indicated here is to apply a relatively weak pulse of air locally on both sides of the split 3, producing a disturbance which upsets the stable split condition of the pack 1 and causes it to close. The nozzle structure 5 can be used for this purpose and can be mounted on the same drive chain which positions the head relative to the interface selected to be split.

The technique is especially useful for a configuration of multiple bistable packs mounted upon a common spindle, which utilizes a common central source of bistable air pressure. In that case, multiple independently positionable heads and "closing" nozzles 5 are utilized relative to individual packs.

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