Browse Prior Art Database

Central Selection With Plural Heads

IP.com Disclosure Number: IPCOM000088687D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 62K

Publishing Venue

IBM

Related People

Orlando, AW: AUTHOR

Abstract

A variably pressured two-chamber piston device of known design [1] can be operated shiftably within a space encompassed by a rotating pack of flexible storage disks and form a stable split at any selected interface in the pack. Such split is sustainable solely by internal bistable pressure effects [2], and provides space for operation of an externally shiftable transducing head. This same device may also be used to form plural concurrently sustainable splits so that plural transducing heads may be operated concurrently in parallel at different randomly selected interface positions in the pack.

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Central Selection With Plural Heads

A variably pressured two-chamber piston device of known design [1] can be operated shiftably within a space encompassed by a rotating pack of flexible storage disks and form a stable split at any selected interface in the pack. Such split is sustainable solely by internal bistable pressure effects [2], and provides space for operation of an externally shiftable transducing head. This same device may also be used to form plural concurrently sustainable splits so that plural transducing heads may be operated concurrently in parallel at different randomly selected interface positions in the pack.

Referring to the drawing, the piston device 1 comprises a pressure coupling section 1.1 and a hub section 1.2. The hub contains a peripheral slot 1.3 which, by shiftable positioning of the device 1, can be aligned with any interface space
2.1 relative to the rotating storage disks 2. The disks 2 are minimally spaced by radially porous washers (not shown) which allow air to circulate into all spaces
2.1 from the inner space occupied by device 1 and thereby allow replenishment of air expelled from spaces 2.1 by centrifugal action.

The hub contains first internal channels (not shown) connecting its slot 1.3 with a valved passage 1.4 in an inner pipe 1.5. Flange-like control plates 1.6 and
1.7, located symmetrically on opposite sides of the hub, partition the central space encompassed by the disks into differently pressurable inner and outer zones 4 and 5, respectively. Inner zone 4 includes subspaces 4.1 and 4.2 separated by the hub. Outer zone 5 includes subspaces 5.1 and 5.2 separated by the inner zone space.

Subspaces 4.1 and 4.2 are connected through second internal channels in the hub (not shown) which are isolated from the aforementioned first internal channels. Subspace 4.1 is also connected with valved passage 1.8 between the inner pipe 1.5 and outer pipe 1.9. Thus, subspaces 4.1 and 4.2 are equally pressured at the pressure applied to passage 1.8. Outer subspaces 5.1 and 5.2 are also equally pressured through valved pressure conduits connecting directly with the unshiftable structure supporting the disks.

The disks are bounded by rigid end plates 6 and 7 whi...