Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
369251, 369270, 369271, G11B 360
A phonographic source has a turntable with a central hub joined by radial arms to a peripheral rim in which the weight of the turntable is concentrated so as to expose at least a major part of the underside of a record supported on the turntable. The record is supported at the hub, and by the arms and/or the rim, and in a modification by one or more concentric rings. The central spindle of the turntable for reception in the record center hole can be connected to the turntable drive shaft only indirectly, by a further construction in which the drive shaft connects with a lower turntable member connected with an upper turntable member for supporting the record by a concentric ring between the members. The source can include a pick-up arm having a counter-balance portion extending from the front position away from the portion carrying the cartridge, which counterbalance portion has at least approximately the shape of the other portion.
patent: 1245568 (1917-11-01), Collins
patent: 1360900 (1920-11-01), Davis
patent: 1641136 (1927-08-01), Dorn
patent: 3815924 (1974-06-01), Hasselbach
A.R.D. Technical Assistance and Engineering Services Internation
Shepperd John W.
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