1975-05-07
1976-06-15
Aegerter, Richard E.
Undertaking
G11B 338
Patent
active
039632466
ABSTRACT:
An improved tone arm and suspension system therefor for record players. The tone arm is an articulated tone arm comprising a rigid main beam and a head assembly connected thereto at a pivot point. A control means, for moving the head assembly along a curved path such that the path in which the stylus vibrates extends along a radius of the turntable during record play comprises a bearing plate fixed to the head assembly at a predetermined angle and a rigid linkage means spaced beside the main beam. One end of the linkage means is secured at a point spaced from the center post for pivoting in a plane parallel to the turntable. The linkage means is of predetermined length such that its other end slidably contacts the bearing plate to provide proper orientation of the head assembly during record play. Means extending between the linkage means and the main beam, intermediate the ends thereof, co-ordinates pivotal movement of the linkage means with that of the main beam. The tone arm suspension comprises a first gimbal ring associated with the tone arm, the first ring lying in a plane generally parallel to the turntable and secured within a second gimbal ring for pivoting in a plane perpendicular to the turntable. The second ring is pivotally mounted on the top of a vertical center post secured to the chassis of the record player, for rotation in a plane parallel to the turntable. Simple construction, reduced friction during operation and improved tracking of the stylus in a record groove may be achieved by the present invention.
REFERENCES:
patent: 2862716 (1958-12-01), Marks
patent: 2983517 (1961-05-01), Klein
patent: 3005059 (1961-10-01), Raabe
patent: 3319967 (1967-05-01), Zimmermann
patent: 3380744 (1968-04-01), Ohnishi et al.
Aegerter Richard E.
Kent W. Charles
Stephan Steven L.
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