1978-06-05
1980-01-29
Shepperd, John W.
Undertaking
G11B 310
Patent
active
041858352
ABSTRACT:
A gramophone pick-up arm has a balance weight arrangement which comprises a selectable number of lead laminations contained in a molded plastic box constituting a main balance weight casing which is adjustable in two directions, one direction being aligned with the axis of the arm at its pivotal and rotational bearings and the second direction being aligned with the pivotal axis of the arm. Light weight plastic spacers may be included in the box to prevent the lead laminations from moving about therewithin. The main balance weight casing carries a pair of flanking rider weights arranged laterally with respect to the length of the arm, one of the rider weights being provided with a micrometer screw adjustment whereby its position relative to the main balance weight casing can be precisely set for fine control, and the other rider weight providing coarse control and being indexable between forward and rearward limiting positions. Apart from the weights per se, all components of the balance weight arrangement are formed of precision molded glass or carbon fiber loaded plastic, as also is a bearing carrier into which the arm proper plugs, and from which the balance weight arrangement is adjustably carried, and integral with which are knife-edge bearing portions. The arm proper is a titanium tube processed in an atmosphere of nitrogen so as to develop a hard titanium nitride outer layer.
REFERENCES:
patent: 3645541 (1972-02-01), Robertson-Aikman
patent: 3722893 (1973-03-01), Shimoda
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