Needle for Graphophones and the Like. Page: 2 of 3
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UNITED STATES PATENT OFFICE.'
FRED PETMECKY, OF AUSTIN, TEXAS, ASSIGNOR TO H. F. THOMPSON, OF
NEW YORK, N. Y.
NEEDLE..FOR GRAPHOPHONES AND THE LIKE.No. 849,425.
o all whom it may concern:
Be it known that I, FRED PETMECKY, a
citizen of the United States, and a resident
of Austin, in the county of Travis and State
5 of Texas, have invented a new and Improved
Needle for Graphophones and the Like, of
which the following is a full, clear, and exact
description.
My invention relates to improvements in
to needles or styluses for graphophones and
machines of that character, the principal ob-
jects being to provide for modifying the tone
produced and to provide for increasing the du-
rability of the needle. The first of these objects
15 I attain by modifying the form of the body of
the needle in such a manner as to permit vi-
brations in a certain manner, and the latter
I provide for by producing a point of a new
form, which when used on one side will
20 cause a sharpened point to appear on the
other, thus permitting the needle to be re-
versed after each operation and leaving a
sharpened point ready for the next opera-
tion.
25 When using needles of an oval cross-sec-
tion on disk-machines, the surface which
comes in contact with the record is worn off
in a short time and a new needle has to be
substituted for practically every record which
30 is to be .operated upon. If the expedient
of turning the needle over is employed, it is
. found that the wear of the record on the
point has produced burs upon the other
side, which prevent its being used in that
35 manner. Needles are also usually made
with 'a practically uniform cross-section from
the shank to the point. This does not per-
mit sufficient vibration. In order to pro-
duce a fine tone, I have discovered that it is
40 desirable to reduce the cross-section of the
needle in a position just above the point, so
that while the point itself is rigid it is sup-
ported by a flexible section of the shank, and
consequently it is capable of a certain degree
45 of motion.
While I am aware that a flattened shank
has been employed for an unknown purpose,
I believe that I am the first to produce a
needle or stylus of this. character having a
5o flattened portion located in exactly this posi-
tion.
Reference is to be had to the accompany-
ing drawings, forming a part of this specifica-
tion, in which similar characters of referencePatented April 9, 1907.
indicate corresponding> parts in all the> fig- 55
ures. /
Figure 1 is a side elevation of a stylus con-
structedin accordance with the principle of
my invention, showing how it is used to pro-
duce a loud tone. Fig. 2 is a similar view 6o
showing how the needle is used to produce a
soft tone. Fig. 3 is a sectional view on the
line 3 3 of Fig. 2. Fig. 4 is an elevation of
the needle as it appears after the point is
worn by use. Fig. 5 is a similar view show- 65
ing the needle when reversed and ready to
commence operations again.
My needle is provided with a shank a of the
usual character and with a point b. Be-
tween these portions and extending' from the 70
rear end of the point to a place on the shank
which is below that at which the shank is se-
cured in the holder is a flattened section c.
This section is not thin enough to have any
material effect upon the vibration of the 75
point, and at the lower end of the flattened
portion c are a pair of concave surfaces c' on
the two sides of the needle,'which'include be-
tween them a thin section c2, that permits vi-
brations of the point itself. The purpose of '8o
this feature will be well understood by those
familiar with musical instruments. It is of
course understood that the needle conducts
the vibrations to the sound-diaphragm or to
the box, and being thinned just at this point 85
as low as possible on-the needle without re-
ducing the thickness of the point itself a finer
tone is imparted when musical compositions.
are played upon the instrument. The tone
is also modified by the.position of the flat- 90
tened surface: When the flattened surface
is placed toward the record, it gives a loud
tone, while with the edge toward the record a
soft tone is produced. At angles between
these two extremes it gives tones of interme- 95
diate quality.
In' order to provide the self-sharpening
feature which I have mentioned above, I
make the point of the needle in the general
shape of a pyramid with concave sides d. It 100
will be seen by reference to Figs. 3, 4, and 5
that when the needle is drawn along the rec-
ord with one of the edges in the groove the
wearing of the needle at its point, as shown in
Fig. 4, will-merely produce a sharpened point 705
on the opposite side, so that when the needle
is turned around one hundred and eighty de-
grees, as is shown in Fig. 5, the point will beSpecification of Letters Patent.
Application filed iranuary 10, 1906. Serial Na, 295,380.
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Reference the current page of this Patent.
Petmecky, Fred. Needle for Graphophones and the Like., patent, April 9, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510797/m1/2/?q=%22%22~1: accessed July 9, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.