Phonograph tonearm pickup counterbalance
OwnerLewis Eckhartinventor
Life of this patent
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Abstract
A low mass counterbalance assembly is provided for the tonearm of a phonograph. The counterbalance assembly includes a leaf spring and magnet that are attached to the tonearm. The magnet interacts with a second magnet attached to the base of the phonograph thereby affecting the downward tracking force of the tonearm stylus. The leaf spring modulates the interaction of the magnets.
Claims11
In a record player turntable having a base, a record carrier movably mounted on the base, a pickup arm means, means on the base for mounting the pickup arm means for horizontal and vertical movement relative to the base, a pickup device mounted adjacent one end of the pickup arm means remote from the mounting means, the improvement comprising, first magnetic means, means for resiliently mounting said first magnetic means adjacent the other end of the pickup arm means, second magnetic means mounted on the base, said first magnetic means being movable relative to said second magnetic means and being vertically spaced relative thereto, each of said first and second magnetic means having opposed face portions of like polarity, whereby the relative polarity of said first and second magnetic means exerts a force on said other end of the pickup arm means.
A turntable apparatus comprising a base, a recorded information carrier movably mounted on said base, support arm means pivotally mounted on said base and having stylus means for contacting said carrier, a first magnet mounted on said base, a second magnet, means for resiliently mounting said second magnet to said support arm means extending generally outwardly therefrom and horizontally to said support arm means, said second magnet being generally vertically spaced relative to said first magnet, and said first and second magnets having opposing faces of like polarity.
Dependencies are inferred from the claim text.