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US Patent 7944803 Tone arm assembly

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Patent
Patent

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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7944803
Date of Patent
May 17, 2011
Patent Application Number
12243631
Date Filed
October 1, 2008
Patent Primary Examiner
‌
Mark Blouin
Patent abstract

A tone arm assembly for use with a rotatable turntable. The tone arm assembly includes a tone arm body supported adjacent to the rotating turntable being horizontally pivotable about a vertically extending axis. A tone arm tube is provided having a longitudinal axis and a first end and a second end, the first end extending within and being supported by the tone arm body and the second end terminating at a shell for releaseably supporting a pick up cartridge. A counterweight is included which is translatable along a horizontal path parallel to the longitudinal axis of the tone arm tube between a first position and a second position, the first position being closest to the shell and a second position being farthest from the shell to adjust contact pressure between a stylus maintained by the pick up cartridge and a record supported by the rotatable turntable. At least a portion of the counterweight is capable of extending fore and aft of the vertically extending axis when the counterweight is positioned on its horizontal path between its first and second positions.

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