Rotary drum assembly with pump-out spiral grooves

Details Rotary drum assembly with pump-out spiral grooves Rotary drum assembly with pump-out spiral grooves

1992-02-19

1993-11-23

Young, W. R.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Continuous consecutive storage or retrieval of interrupted...

360107, 36013024, G11B 712, G11B 1561

Patent

active

052650847

ABSTRACT:
A rotary drum assembly comprises a stationary member having a stationary cylindrical portion, and a rotary member having substantially the same diameter as that of the stationary member and positioned in the vicinity of the stationary member so as to be relatively stationary to the stationary member. Each of surfaces of the rotary member and the stationary member opposing to each other is formed to have a step structure having a plurality of opposed surfaces, and pump-out type spiral grooves are formed on at least two of the plurality of opposed surfaces of one of the rotary and stationary members.

REFERENCES:
patent: 4495609 (1985-01-01), Russell
patent: 4517615 (1985-05-01), Hino
patent: 4525757 (1985-06-01), Imanishi et al.
patent: 4525828 (1985-06-01), Higashiyama et al.
patent: 4641214 (1987-02-01), Imanishi et al.
patent: 4661941 (1987-04-01), Bell et al.
patent: 5041937 (1991-08-01), Saito

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