G - Physics – 11 – B
Patent
G - Physics
11
B
181/63
G11B 3/38 (2006.01) G11B 3/12 (2006.01)
Patent
CA 1051357
ABSTRACT OF THE DISCLOSURE 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 there- to at a pivot point. A control means, for moving the head assem- bly 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 move- ment 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 pivot- ing in a plane perpendicular to the turntable. The second ring is pivotally mounted on the top of a vertical center post secur- ed 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.
252046
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