Automatic control for phonographs playing records of different speeds
AssigneeQuadracast Systems, Inc.
InventorLouis Dorren
Life of this patent
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Abstract
An automatic means is provided for setting a phonograph record player to the proper speed, depending on the type of record placed thereon. A magnet detection circuit is employed in the player and a magnetic adapter is employed for 45 RPM records.
Claims6
In a phonograph record player having the usual turntable with a small diameter spindle and having a first mode for playing a first type of record having a small spindle hole at a first speed, and a second mode for playing a second type of record at a second speed, said second type of record having a large spindle hole and requiring an adapter to adapt the record to said small diameter spindle, said player having a lever for switching said player from the first mode to the second mode, the improvement comprising:
- a. an annular adapter having an outer diameter to fit said large spindle hole and an inner diameter to fit said small diameter spindle for said second type of record and having magnetic means incorporated therein;
- b. magnet detecting means in said player;
- c. switching means activated by said magnet detecting means adapted to switch said lever from one mode to the other, depending on the position of said adapter with respect to said magnet detecting means.
Dependencies are inferred from the claim text.