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US 4,303,999 AGranted
Phonograph having an improved tone arm assembly
AssigneeThe Quaker Oats Company
InventorRonald D. Irvin
Life of this patent
Estimating the term…
Abstract
The object of this invention is to provide an improved phonograph having an improved tone arm assembly and structure associated therewith for automatically returning the tone arm to its rest position when the phonograph cover is closed. The improved tone arm is mounted in a slightly unbalanced condition for movement under the influence of gravity to a normal position. In this normal position the up and down motion of the needle on the record and the force exerted thereagainst is independent of the tone arm.
Claims10
A phonograph having a turntable for receiving a record and an improved tone arm assembly comprising in combination:
- a support arm having a pivot end thereof mounted on the phonograph for pivotal movement of said arm in a horizontal plane substantially parallel to and spaced above the turntable;
- a tone arm housing;
- means for mounting said tone arm housing on said support arm for horizontal pivotal movement in unison therewith between rest and playing positions, and for vertical pivotal movement relative to said support arm by gravity to a normal position toward but spaced from the turntable;
- stop means on said support arm for stopping said tone arm housing in its normal position;
- a needle-cartridge carrying arm;
- means for mounting said needle-cartridge carrying arm on said tone arm housing for vertical pivotal movement relative thereto with said needle engaging a record on the turntable when said tone arm housing is in its normal position;
- and
- spring means coupled to said needle-cartridge carrying arm for providing the only force in addition to the weight of said needle-cartridge carrying arm for urging said needle into engagement with the record.
5 more elements
Dependencies are inferred from the claim text.