US1246694A - Phonograph-needle. - Google Patents

Description

F. L. WOOD.

PHONOGRAPH NEEDLE.

APPLICATION FILED JUNE 30.1915.

1 ,246,694. Patented Nov. 13, 1917.

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AIOLIAI PHON'OGBAPH-NEEDLE.

Speaication of Letters Patent.

application nieuwe so, 1915. serial no. sacas.

To all whom z't may concern:

Be it known that I, FREDERICK L. WOOD, a citizen of the United States, residing at Meriden, in the count of New Haven and State of Connecticut, ave invented certain new and useful Improvements in Phonograph-Needles, of which the following is a specification.

My present invention relates to a novel phonograph needle for use in reproducing sound from sound-records. The advantages i of my said needle will be apparent to those skilled in the art from an understanding of .also a length of brass or steel tubing about eighty thousandths of an inch in diameter. The tubing may be shorter than the wire because it will extend'farther than the wire in the hereinafter described drawing operation. A The Xliole through the tubing is small so that it nicely receives the wire -into it. The wire having been inserted entirely through the tubing, the two are brought into union with each other by being subjected to a wire-drawing operation. In Fig. 1, the wire is designated 1 and is shown located inside the tubing 2 preparatory for the drawing operation. In Fig. 2, 3 is the wire-drawing die. The sheath and wire to the right 'of the die are supposed to have been drawn through it. They are reduced in diameter,

elongated and drawn into perfect union with each other. The wire thus becomes perfectly integrated with the sheath to the great benefit of the tonal qualities ofthe resulting needle. The piano wire is hard to start with; and the metaltubing becomes so, due to the drawing operation, with the result that itis given a finely resonant and other qualities, especially adapting the composite wire for phonograph needles. To this end,

annealing is avoided in connection with the drawing operation or operations. The brass sheath gives a softer playing needle than the steel.

yThe next step yin the manufacture of the y .This is shown in Fig. 3 where 'the point isv designated 4. Both sheath and wire will then be cut through on the line 5-5 in Fig. 3 to produce the nal needle. `The result of this step is shown in Fig. 4. The same milling and cutting off operations will then be repeated on the remaining free-end portion A Fig/1 and so on until the whole length of the composite sheathing and wire is formed into needles.

The tonal quality of these needles is excellent; and their hard drawn piano-wire points are tough, non-breaking, very smooth and uniform in action, and capable of playing a great many records per needle.

Of course, it is possible that certain steps could be practised iii-the reverse order and other changes might be made in the process or the materials which would still be within the spirit and intent of my invention and these I mean to be covered by the claims.

I prefer tol choose my material for vthe sheath so that after the final drawing operation it will still be suiiciently softer than the piano-wire that a milling tool can be chosen which will cut the sheath to expose the wire-point without cutting the oint, this selectie action of the tool making it easy and practical to expose said points.

What I claim is 1. A. phonograph needle comprising a ssl metal sheath filled with a wire, the two having a drawn union with each other, one end` of the wire being exposed for a short distance toform the record engaging point.

2. A phonograph needle comprising a metal sheath filled with a wire, the two having a drawn union with each other, said nedle having a record engaging point at its en In testimony whereof, I have signed my ioo name to" this specification thisv 29th day of June 1915.

FREDERICK L. WOOD.

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