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US 4,061,342 AGranted
Tone arms
OwnerSteven H. Younginventor
Life of this patent
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Abstract
A tone arm which uses a suspension instead of a conventional arm and pivot. It is designed to reduce mass by reducing the physical size of the components of the device. It also provides a suspension that is more compliant than that of the cartridge stylus suspension. Tracking is provided in a straight line eliminating skating force and track error. A linear bearing provides very low friction translation of the carriage on the track.
Claims8
A tone arm assembly adapted for mounting a phonograph cartridge comprising:
- a vertical base member;
- an elongated horizontal support member rotatably mounted on said base and having an elongated opening formed therein and side tracks disposed on opposite sides of said opening;
- and
- a carriage comprising a suspension support member mounted so as to move freely along said side tracks, a cartridge mount assembly adapted for mounting a phonograph cartridge, a first balance arm pivotably mounted on one side of said suspension support member and coupled to one side of said cartridge mount assembly, a second balance arm pivotably mounted to the other side of said suspension support member and coupled to the other side of said cartridge mount assembly, whereby the cartridge may be balanced by adjustment of said balance arms, and first and second counter balance weights slideably mounted on said first and second arms, respectively, whereby the tracking force applied to said cartridge is selectable by means of said counter balance weights.
1 more element
Dependencies are inferred from the claim text.