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Патент USA US2121272

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W“:
EL 13.
L‘ E, TURNER
'
METHOD OF PRODUCING souun REPRODUCING NEEDLES
Filed Jan. 28,1935
2,123,272
'
‘
Patented June 21, 1938
2,121,272
UNITED, STATES PATENT OFFICE
2,121,272
METHOD OF PRODUCING SOUND REPRO
DUCLNG NEEDLES
Application
Louis
January
E. Turner,
28, 1935,
Chicago,
Serial No. 3,709
1 Claim. (Cl. 29-1695)
The invention relates to the production of nee
In manufacturing the needle the tip of wear
dles for reproducing sound.
.
resisting metal is first fused to the shank of
It has heretofore been common to unite a tip softer metal by an electric or gas weld.‘ During
of hard wear-resisting alloy, such as iridium, os
this fusing the soft metal in the shank loses its
5 miridium or carboloy to a cylindrical shank of
temper. Next, the tip and tapered end of the 5
softer metal, such as brass or ‘bronze, by means shank are ground on'lathes, laps or fine stones
of an electric or acetylene weld but, on account. to the desired anglenecessary to ?t the record
of the lack of rigidity in the shank, the sound grooves perfectly. Next, the point of the tip is
reproduction was not as efficient as desired. In
rounded off to secure the necessary radius by
10 some instances the tip and a portion of the shank means of tumbling in a suitable tumbler or with
above the tip or a portion of the shank above the a mixture of shot and abrasives or by means of
portion fused to the tip have been ?attened or abrasive paper or cloth applied against the spin
made elliptical, to provide a limited amount of ning tip held in a lathe or similar tool.‘ Next,
?exing in the shank in one direction and stiffen
the temper of the shank, and particularly the
ing in the transverse direction. In the latter tapered end portion contiguous to the tip which
type, it is necessary to set the needle so that its has been destroyed in the process of welding, is
?attened portion has a definite relation to the restored by means of hammering or rolling or
direction of the grooves in the records because stamping in a press or squeezing in a screw vice,
if the needle was not properly set it would injure so that the metal of the shank or said contiguous
the record and would not e?iciently reproduce portionlwill be tempered or densified to provide
20
sound.
'
The object of the present invention is to pro-‘
‘ vide a simple method of producing needle which
comprises a round shank of soft metal and a fused
the desired rigidity.
By retempering the tip portion of the shank,
weakness in the common or simple round type
of needle, which causes'its failure, is overcome.
It is not necessary to ?atten the shank above 25
wear-resisting tip and possesses the‘desired ri
gidity for e?icient and accurate reproduction and >1 the tip to give it ?exibility in one direction and
does not require de?nite positioning with respect rigidity in a transverse direction, but it will be
to the grooves in the record being produced.
understood that a portion of the shank above the
This object is accomplished primarily by fus
tip portion may be somewhat ?attened or ellip
ing a tip of wear-resisting metal to a shank of tical, but when the shank is retempered, as set
softer metal and tempering the shank, and more forth, the rigidity of the tip portion of the shank
particularly that portion which is contiguous to is not maintained, so that it is not necessary to set
the upper end of the tip, to give it the desired the needle in any definite relation to the grooves
rigidity for correct reproduction of sound, with
in the record, and the needle will be properly
out requiring de?nite positioning of the needle operative for reproduction in any rotative posi
relatively to the grooves in the record being re
tion.
produced.‘ In practice; it has been. found that
The invention is not to be understood as restrict
a shank which is tempered after the tip has been ed to the details set forth, since these may be
fused thereto will achieve this result.
modi?ed within the scope of the appended claim,
40
The invention consists in the several novel fea
without departing from the spirit and scope of 40
tures hereinafter set forth and more particularly the invention.
defined by claim at the conclusion hereof.
Having thus described the invention, what I
The drawing illustrates a needle embodying the claim as new and desire to secure by Letters Pat
invention.
out is:
The invention is exempli?ed in a needle com
That improvement in producing a needle for
prising a shank with a cylindrical body portion reproducing sound which consists in fusing a tip
I and a tapered or .conoidal end portion 2, and of comparatively hard wear-resisting metal to a
a conoidal record-engaging tip 3 formed of hard shank of softer metal and then retempering the
metal. such as carboloy, iridium, or osmiridium. entire shank after the tip has been fused thereto.
50 The shank is formed of suitable metal, such as
50
bronze, brass,‘ or steel. The tip is fused to the
LOUIS E. TURNER.
end of the tapered portion 2 of the shank. The
shank is tempered.
.
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