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US 4,538,258 AGranted
Record
AssigneeKabushiki Kaisha Sankyo Seiki Seisakusho
InventorsHaruyoshi Miyako, Kiyoteru Arima
Life of this patent
Estimating the term…
Abstract
A record (12) comprising a convex protrusion (12a) at its center, one or more protrusions (12b) extending perpendicularly from the plane of the record at its circumferential edge, and a recording area between the center and the circumferential edge. The protrusions engage similar indentations (3b, 3e) formed in a turntable to facilitate centering and holding the record for playing and to prevent rotational slippage.
Claims3
A record for play on a turntable having a central concave indentation and one or more circumferentially varying indentations on a circumference of said turntable, comprising:
- a flat disc (12);
- a convex protrusion (12a) substantially at the center of said disc for engaging said central indentation and centering said disc;
- and
- one or more protrusions (12b) formed on the circumferential periphery of said disc for engaging said circumferentially varying indentations and for rotating said disc as said turntable rotates, said peripheral protrusions varying circumferentially around said disc, insertable into one of said indentations and contactable with a circumferential side of said one indentation.
1 more element
Dependencies are inferred from the claim text.