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Патент USA US2007460

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' July 9, 1935.
H, c. PYE
Filed July 18, 1952 »
Fig. E'
-fnu-En D11-I
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_Patented July 9, 1935
HaroldI c. rye, oak' Park, nl., mignnr t0 Asso
ciated Electric Laboratories, Inc., Chicago,l Ill.,
f a corporation of Delaware
Application July 1s, 1932, serial N0. 62?.,130-
40mm. (el. 179-180)
l 'I'his invention relates in general to an acoustic which the material has been formed into a hollow
device, and the principal object of the invention tube; Fig. 3 depictsl the apparatus in cross-sec
is to provide an acoustic device utilizing a sec tion with the tube inside of the forming apparatus
tion of tubing of paper, metal, or other suitable ready to be compressed; Fig. 4 shows the tube in
5 material having a high degree of flexibility, in the act of being compressed by the mechanism;
an economical manner. A ñexible tube made in While Fig. 5 illustrates a side View of the com
accordance with the invention is adapted for a pleted flexible tube. Fig. 6 illustrates a modifica
wide variety of usages, a particular utility being
in connection with sound transmitting apparatus.
Itis, therefore, an object of the invention to pro
vide a damping device for damping the vibrations
of sound transmitting apparatus which- device
has a high degree of efficiency and dependability
and which may be easily manufactured and as
sembled in the sound apparatus.
A further- object -of the invention is to design
a iiexible support for diaphragms such as are
used in acoustic apparatus so that they may vi
brate over their whole surfaces, thereby consid
"20 erably reducing or eliminating the tendency of
the diaphragms to vibrate at their natural period,
or frequency, which may disturb and distort the
sound waves when this frequency falls within the
range of the voice frequencies.
A particular feature of the invention resides in
the design of a flexible member arranged to pro
vide suitable damping means for the diaphragm
of sound transmitting apparatus, which at the
tion of the method of making the tube; Fig. 7
illustrates a further modification of the method
of manufacturing the tube; while Fig. 8 illus 10
trates a step in this same method. Figs, 9 and 1.0
show side andend views of a section of ñexible
metal tubing construction in accordance with the
method of Figs. 7 and 8; Fig. 11 discloses a side
cross-sectional elevation of a sound transmitting 15
apparatus, such as a telephone transmitter unit.
In constructing the flexible metal tube in ac
cordance with the preferred method of the inven
tion, a sheet of relatively thin material 5 which
is preferably paper, but which may also be thin 20
metal, ñbre, or other suitable material, depending
on its use, is cut to the desired length and Width.
The piece of material 5 is then wound» around the
mandrel 6, preferably so that the ends overlap to
a considerable extent. A suitable amount of ad 25A
hesive may then be applied »to the right and left
hand ends of the sheet after it is wrapped upon
the mandrel. It is not desirable to apply the
same time serves as the microphone cell of the adhesive along the overlapping edges of the ma
30 ' apparatus.
terial as this would have a tendency to stiiîening 30
The invention is not limited to the production the tube after it is formed. In certain instances
of flexible tubing for use only in sound transmit the adhesive may be dispensed with as will be ap
ting apparatus, but is concerned with a flexible parent hereinafter. After the adhesive has dried
ltube and the method of making the same for any
36 other purposes to which a tubing oi' this construc
tion may be put. The tubing may be constructed
o! metal and thereby-_be used for the elbows or
joints _in small pipe line systems; it may be used
upon the mandrel 6, the piece of material is re
moved from it, and it assumes the smooth form
shown in Fig. 2. If seamless tubing is used, the
above two steps of course are not necessary.
The next step is to pass the formed tube 5 over
to form the walls or chambers of an air or hy the guide rod 1, which, it will be seen, is slightly
draulic valve-which is adapted to be expanded smaller in diameter than the tube 5. The guide 40
and compressed; or for any other mechanical rod 1, together with the tube 5,-is then placed in
Purpose where a closed chamber which is ex side the hollow cylinder 8. The opening oi’ the
pansible and contractible is necessary. The in cylinder 8 is of such a size that the tube 5 occu
vention, however; is illustrated in connection pies a space approximately midway between the
with only one of the numerous uses for the flexi inside surface of the hollow cylinder 8 and the
ble tube, the other uses being readily perceived outside surface of the guide rod 1. A pair of hol
Without further consideration.
low cylindrical plungers 9 and I0 are then inserted
The invention is described and illustrated in in each side of the hollow cylinder 8 and over the '
accordance with the accompanying drawing which guide rod 1. These plungers 9 and I0 are shaped
shows a number of different methods of con to form a very close fit between their surfaces and
structing the flexible tube and also an application that of the guide rod 1 and the cylinder 8, with
of the device.
which Athey are in slidable contact. A suitable
In the drawing, Fig. 1 illustrates the first step amount of pressure is then applied to the plung
in the method of manufacturing a section of ers 9 and i0 in a direction towards each other as
flexible tubing; Fig. 2 shows the second step in indicated by the arrows so that the tube 5 is al 55
2 .
most completely compressed or crumpled together and 24 are inserted over the outside ends of the
as shown clearly in Fig. 4. The pressure upon tube 5 in order to hold it tight and steady' on
the plungers 9 and I0 is then removed and the the guide rods 20 and 2 I. A slight upward move
guide rod 1, together with the compressed tubing ment is then given to the guide rod 20 and spring
5, is removed from the hollow cylinder 8. The clip 23. This results in a kink or crinkled por
formed tube 5 is then slid on the guide rod 1 and tion 25 being formed in the tube 5. Guide rod 20,
it expands slightly and assumes the shape indi together with the spring clip 23, is then pulled out
cated in Fig. 5.
to the right a slight distance from the tube 5.
It will be appreciated that formation of the tub Another kink or twist 26 is then imparted to the
l0 ing 5 may be done either by hand with the ap tube 5, but in a position, however,- at~this time 10
paratus or may be done automatically by suitable ~approximately 120° from its initial position, there
machinery. It will likewise be appreciated that by forming a different' kink on the tube 5. The
the length of the flexible tube 5 as completed is tube is again moved a slight amount off of the
dependent upon the length of the material sup guide rod 23 and spring clip 23, whereupon a
15 plied in
1, as well as the amount of pressure further kink or twist 21 is formed which is also 15
applied by the plungers 9 and I0 to the tubing 5. approximately 120° turned from the second twist.
With a Wide piece of material and considerable As seen in Figs. 9 and 10, this successively kink
pressure of the plungers, a section of tubing may ing of the tube 5 at points 120° apart results in
be produced which is of the same length as a sec
20 tion of tubing which is made of a narrow piece of
material upon which very light pressure is applied.
The two resultant iiexible tubes being of the same
length, however, are of different degrees of re
a flexible tube as shown, in which the successive
kinks are indicated at 25, 26, and 21. 'A flexible 20
tube of any desired length within practical limits
may be constructed with this method.
Referring now more particularly to Fig.,11,
siliency, the article-according to the latter this discloses a type of sound transmitting appa
method-_having very few folds or pleats while the ratus in which a flexible tube constructed accord-.
former consists of numerous folds.
ing to the invention may be used. As an example,
The finished section of flexible tube illustrated a transmitter unit has been illustrated. It com
in Fig. 5 is in the form of a crumpled tube with prises an ordinary type of solid back transmitter
the folds arranged indiscriminately and at ran having a casing 30 for supporting the various
dom around the article, and, because of these parts and a floating diaphragm 3| preferably con 39
numerous folds, both large and small interspersed structed of carbon. In order to minimize the
around the circumference, considerable resiliency response of the diaphragm 3| more readily to
is imparted to the material of which the flexible its own naturalperiod of vibration or frequency
tube is constructed. It, therefore, can be easily and thereby distort the speech waves, the dia
and readily expanded or contracted Without great phragm is of the floating type, that is, it is ar 35
force or pressure, and, being very light in weight ranged to vibrate over its whole surface simul
it may be adapted-for a considerable number of, taneously and is not supported rigidly around its
usages, some of which have been pointed out and periphery as is common practice. A flexible paper
some of which will hereinafter be illustrated.
tube'32 of relatively large diameter is inserted be
Fig. 6 illustrates a modification of the method tween the turned over edge of the casing 30 and l..
of manufacturing a flexible tube from that shown the periphery of the diaphragm 3 I. If desired, it
in Figs. 3 and 4 whereby fewer forming parts are may be attached to each of these surfaces by
necessary. The tube 5 which may be made in the~ means of suitable adhesive. A similar ñexible
form vshown in Figs. 1 and 2 is slid over the end tube 33 is inserted on the opposite side of the
of the plunger I1, and this, together with the tube, diaphragm 3| and also glued to the casing 30.
is then inserted in the opening in the die I5. The diaphragm 3| is, therefore, free to vibrate
A shoulder I6 is formed on the die I 5 and a similar over its complete surface in a lateral direction,
shoulder I8 is formed on the plunger I1. As seen and the flexible tubes 32 and 33 resiliently sup
in cross-section, the tubing 5 occupies the space port it without interfering with. its freedom of
midway between the outside surface of the vibration. The tubes also tend to slightly damp
plunger |1 and the inside surface of the die I5. the vibrations of the diaphragm 3| when it is
Pressure is then applied upon the plunger I1 actuated so as to further assist in damping out
either manually or by machine means, and the undesirable vibrations within the speech fre-_
tube 5 is thereby crumpled together between the quency range.
The numerous closely packed folds in the ilex
the shoulders I 6 and |8‘into the bellows shape, as
shown in Fig. 5, with the corrugations or pleats ible tubes function to damp the diaphragm vibra
formed at random throughout the circumference tions by'expelling and drawing in the air between
of the tube. When the pressure is removed by the the folds when the flexible tube is beingv com
plunger |1 being withdrawn, it causes the tube pressed and expanded. The eil'ect is to cushion
to expand slightly to its proper length due to its the diaphragm on a successive series of air pockets
instead of depending entirely upon the resiliency
resilient nature.
In the above two methods of constructing the of each of the folds to produce this result.
The microphone cell of the transmitter com
flexible tube, it will be appreciated that the length
of the tubing is restricted within practical limits. prises a fixed electrode 31 suitably supported and
Tubes of this length, however, find a ready use insulated in the rear of the casing 30. The front .
particularly in connection with sound transmit _electrode or moving electrode is formed integral
ting' apparatus, as will hereinafter be pointed out. with the diaphragm 3| and consists of a section
A further method of which a flexible tube may of the rear side of the same. A flexible tube 35,
in accordance with the methods out
bemadeisshowninFigs.'Iand8. Thetubei >constructed
lined in the invention,- forms the enclosure for the 70
is made upinamannersimilartothat shown in .microphone
cell-_ A suitable amount of granu
Figs. 1 and 2 and apair of guidero'ds 2l and 2| . lated carbon material 36 is supported in the cell
are inserted from each end a su’ihcient distance by the ñexible tube 3_5. One end of the tube is
cated as 22. A pair of circular 892111K clips 23
suitably adhered to the rear side. of the diaphragm
vu while insopponœ endißattacned tothe 'aur- 75
face or face to the fixed electrode 31. Current
carrying wires are attached to ilxed electrode 31
and the carbon diaphragm 3| in any desired
manner.y In the operation of the transmitter,
speech Waves impinge upon the front side of the
diaphragm 3|, and it vibrates over the whole
surface in unison with the speech waves because
it is resiliently supported between the ñexible
ers, phonograph units, and any other place where
a flexible support having very little inertia, but
which has a slight damping effect, may be uti
thereby translating the speech waves into elec
What is claimed is:
1. In a sound transmitter, a microphone cell
containing carbon granules, a front and back
electrode in the cell, a fiexible tube enclosing the
tubes 33 and 32. ' The flexible tube 35 is thereby carbon granules and extending between the elec
alternately expanded and contracted in order to trodes, said tube comprising a sheet of paper
agitate the carbon granules 36 and vary the cur rolled into a cylinder and compressed to form
rent flow extending over the circuit path includ accordion pleats throughout its length before
ing the diaphragm 3| and fixed electrode 3l, assembly and acting to retain the carbon in the
15 trical waves.
The tube 35 also imparts a slight
damping effect upon the diaphragm 3| when it is
actuated, thereby minimizing the vibration of the
diaphragm 3| so that it does not tend to vibrate
at its normal frequency and distort the speech
20 waves. This damping effect is produced by the
2. In an acoustic device, a microphone cell, a
front and rear electrode therefor, a cylinder ex
tending between the electrodes, said cylinder pre
formed before assembly in the transmitter from
a sheet of flexible material rolled into a cylinder
which is compressed to form accordion pleats at 20
air cushions between the numerous folds ofthe random throughout its length, said cylinder hold
ing the granular carbon in the cell.
From the foregoing construction of the micro
3. In an electricaltranslating device, a micro
phone cell, it will be appreciated that the iiex phone cell comprising a rear electrode and a dia
25 ible tube 35 combines a number of functions phragm, a series of damping devices for the dia
which have heretofore been performed by sep phragm each comprising a tube of iiexible mate
arate parts. It forms a complete enclosure for rial preformed, before assembly' into the trans
the microphone cell which at the same time is mitter, from a sheet of material rolled into a
completely insulated by it; it forms a container cylinder compressed to form plaited walls, one of
30 for the carbon granules 36 to prevent them from said tubes retaining carbon granules in the cell. 30
being spilt out; and it also exerts a slight damp
4. In an electrical translating device, a dia
ing effect upon the diaphragm 3|. The trans phragm, a damping element for supporting and
mitter illustrated can be made extremely cheap damping the diaphragm, said element preformed
and economical; and, because it consists of rela before assembly into the device, from a sheet of
35 tively few parts which are light in weight, it is flexible material rolled into a tube and compressed
a very eiiicient operating transmitting unit.
to form bellows-like plaits throughout its length,
It will be appreciated that flexible tubes illus said plaits normally tending to elongate the cyl
trated in connection with the sound transmitter inder and thereby damping the diaphragm.
of Fig. 11 are equally applicable to form supports
for the diaphragms of receivers, dynamic speak
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