Undertaking
Patent
1975-05-02
1977-03-15
Stephan, Steven L.
Undertaking
G11B 360
Patent
active
040120481
ABSTRACT:
Concentric rings of acoustic damping material are mounted on a turntable surface and combine with an insulating adapter to provide acoustic isolation for records with large or small spindle holes. The rings are unconnected to prevent acoustic coupling between the rings while providing a flat surface on which a recording disc may be mounted. The adapter is formed of acoustic damping material and is resiliently mounted in the center of the turntable to be received by two different size spindle holes of various recording discs. The adapter is in the form of a disc having a thin annular section adapted to be received in a large spindle hole and an upstanding cylindrical section or boss of smaller diameter adapted to be received in a small spindle hole. The adapter is resiliently extended to normally position the annular section in the same plane as a recording disc mounted on the concentric rings. When a disc with a small spindle hole is placed on the concentric rings, its weight will bear upon the annular section of the adapter to reposition the adapter so that the boss is positioned in the plane of the recording disc to be received in the small spindle hole.
REFERENCES:
patent: 778492 (1904-12-01), Johnson
patent: 1877707 (1932-09-01), Weil
patent: 2236275 (1941-03-01), Rich
patent: 3034795 (1962-05-01), Guest
patent: 3220735 (1965-11-01), Beugin
Newcomb Audio Products Co.
Stephan Steven L.
LandOfFree
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