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Патент USA US2405850

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Aug. 13, 1946.
O. ROBERTS
_ 2,405,850
ARTIFICIAL LARYNX CONSTRUCTION
Filed Méroh 22, 1945
01.23456788101112131415
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INVENTOR
ROBERTS
ATTORNEY
Patented Aug. 13, 1946
2,405,850
UNITED STATES PATENT OFFICE
2,405,850
ARTIFICIAL LARYNX CONSTRUCTION
Ottie Roberts, East St. Louis, Ill.
Application March 22, 1945, Serial No. 584,189
15 Claims. (Cl. 3-1.1)
1
2
This invention relates to improvements in ar
ent structure, objectively, by a careful and pre
ti?cial larynx construction, and more particularly
determined perforation of a reed element.
to improvements in and relating to the reed as
A further and important object is attained in
semblies of arti?cial larynges, making for im
an easily manipulable, fully enclosed, low cost
provement in tone quality, timbre and modula
expedient enabling a variation at will by the user
tion, and to certain improvements in sound box
or otherwise, of the pitch of the arti?cial voice
construction.
by variation of e?ective vibrating length of a
Exhaustive comparisons by applicant and
beating reed. This applicant is fully aware of
others similarly a?licted, have revealed the ir
numerous eXpedlents for this purpose in earlier
refutable fact that arti?cial larynges of me 10 devices, over which the present structure con
chanical type, in distinction from those of elec
stitutes a considerable improvement.
tromagnetic or electrical types, are far superior
The foregoing and numerous other objects will
to the latter. However, the principal shortcom
more clearly appear from the following detailed
ings of arti?cial speech aids have heretofore in
description of presently preferred embodiments,
cluded a dif?culty in modulation of voice tones; 15 particularly when considered in connection with
a poor quality sometimes re?ected in a brash
the accompanying drawing, in which:
ness or harshness of voice, and a lack of natural
Fig. 1 is a side elevation of an arti?cial larynx
ness of tone. The overcoming of these di?iculties
assembly constructed to embody the present im
and the general improvement of arti?cial voice
provements;
quality, accordingly constitutes a major and gen 20
Fig. 2 is an elevation of a sound or voice box
eral objective of this invention.
as viewed from the side thereof normally ad
More particularly stated in reference to struc
jacent the user, particularly as taken along line
ture, the present improvements have as an ob
2-2 of Fig. 1;
jective, an improved construction of lay, or reed
Fig. 3 is a vertical sectional View, somewhat
backing element, such as to improve and to result 25 enlarged, as taken along line 3-3 of Fig. 2;
in more natural speech tones, and such as to
Fig, 4 is a transverse sectional view through
prevent unwanted and undesirable effects often
a reed assembly as taken along line v4—¢l of Fig.
experienced otherwise, at the end of a syllable,
5;
word, or other speech sound; very importantly,
Fig. 5 is an elevation in the nature of a plan
this feature results in a marked reduction in air 30 view of the reed and lay assembly, a portion of
volume and velocity, hence reduces effort of the
the reed being broken away to reveal certain
user required to produce the arti?cial voice in
features of the lay structure therebeneath;
desirable volume.
Fig. 6 is a side elevation of the reed and lay
Yet another object is attained in an improved
assembly shown by Fig. 5, and illustrating a mode
relation of reed, preferably of beating type, and 35 of attachment and manner of use of a tone con
the companion and cooperating lay structure,
trol appliance of the present invention;
such as to improve practicability of the instru
ment under all conditions of temperature,
Fig. 7 is a transverse sectional view as taken
along line 'l-—'! of Fig. 6;
weather, and of use indoors as well as outdoors.
Figs. 8 and 9 are respectively, side and top or
Akin to the next foregoing object is an im 40 front elevations of a reed and lay assembly em
provement in means for removal of condensate
bodying a multiple reed arrangement;
from a sound box or similar enclosure of the in
Fig. 10 is a diagrammatic side elevation, illus
strument, without the requirement of valves or
trating graphically the development of best
other liquid flow control expedients, and such
curvature of an irregularly curved lay surface
that the condensate is automatically kept at a 45 immediately beneath or behind the reed, and
minimum amount under all conditions.
Fig. 11 is an exaggerated diagrammatic show
A still further object of the invention is at
ing of the lay pro?le.
tained in an improved reed construction involv
Referring now by characters of reference to
ing the use, for certain purposes, of a multiple
the drawing, and with particular reference ?rst
reed assembly in which the reeds bear a prede 50 to Fig. 1, the sound box, casing, or housing, some
termined relation to each other, and each a pre
times known as a voice box, includes, in the ex
determined relation to the lay.
_
An additional object of importance in improve
ment of timbre and even in relief from unwanted
ample shown, a normally vertical cylindrical body
I5, of a generally tubular form provided with an
upper end closure l6 and a bottom or lower end
undesirable voice volume, is re?ected in the pres- 55 closure hereinafter described.
The upper C10
2,405,850
3
sure element or plug may be made of a single
piece of material or a plurality thereof as shown,
and includes, besides the hollow cap designated
by numeral 16, a plug proper I‘! (Fig. 3) ?rmly
and yet frictionally ?tted into a cylindrical re
cess therefor in the cap, the relation of these
parts being such that the cap may be easily an
gularly displaced about the axis of box 15. The
body or box i5 is shouldered externally as indi
cated at it, thus providing a firm and sturdy seat
ing surface for the lower perimeter of the cap 15.
As this general type of device is now well known
in the art, it is sufficient merely to note for com
pleteness that there is provided an air supply
4
which serves to limit the insertion of the latter‘
in the box.
The lay 30 is characterized by a rounded back
surface 34. Instead of providing a more usual
flattened area on the frontal surface just beneath
or back of the reed, the lay 30 is laterally bev
elled as at 35, and is centrally longitudinally
channeled, the channel being shown at 36. From
the form of the channel 36 and the bevelling re~
10 sulting in portions 35, there result a pair of lon
gitudinal parallel edge portions 31 and which
bound the channel 36 at the top and which pre
sent little if any, more than line contacts in all
Zones possibly engageable by the reed even under
duct or tube ‘.20 provided with an enlarged ?t 15 extreme conditions. It is important to note that
restriction of the lay area permissible to be en
ting 2! which, 'with the device in use, is held
gaged by the reed, to merely line contacts, pre
vents any tendency of the reed to stick to the lay
in a non-vibratile position due to accumulation
tube. The tube 20, as will be well understood,
of condensate, saliva or phlegm between the reed
serves as an air supply duct into the voice box 20
and lay. These dif?culties have been seriously
l5 and serves controlledly to vibrate the reed as
and frequently experienced with older forms.
sembly later to be described.
It is an important feature of the invention to
A resonance and modulating connection is pro
provide, within narrow limits of deviation, a parvided for by a tube 22, directed from an upper
ticular contouring or pro?le of the reed-engage~
Zone of the chamber within the voice box, to the 25
able surface of the lay, in the present example,
mouth of the user, for the purpose of taking ad
this contouring being imparted to the edges 37.
vantage of normal resonance effects of the oral
The pro?le arrived at by painstaking experience
cavity and chambers of the upper throat and of
_ and numberless trials, is exempli?ed by ‘the di
the head, such as the sinuses of the user. To
agram of Fig. 10. Assuming for purposes of in
promote ease of breathing, with the instrument 30
struction only, that the line Y-—Y be considered
in place, but between periods of speech, an air
?rmly adjacent the external tracheal opening of
the user, or if desired, ?tted to a tracheotomy
outlet opening i9 is provided, which may be read
ily ?nger-controlled.
It is a distinct preference to construct the de
vice throughout, with only unimportant excep
tions later noted, of non-metallic material, such
as hard rubber or of any of numerous other ther
as horizontal and the line X--X as vertical, the
curvature of irregular nature, best given the lay
pro?le is as indicated by the legends accompanying and forming a part of Fig. 10. For this pur
pose it will appear that the active or vibrating
length of the reed, generally indicated at 40 is
divided into ?fteen aliquot parts representing
moplastic materials now available to the trade,
7 equal intervals along line Y—-Y. In this case the
similarly to hard rubber, in sheet, rod, bar or
several values of X proceeding along the line
other stock shapes or if desired, many parts of 40
Y-Y, representing vertical distances therefrom
the article may be produced directly by moldto the contour line of the lay are given suc—
ing. The preferred exceptions to theotherwise
completely non-metallic construction‘are found
cessively as .11, .21, .30, .38, .44, .48, .50, .51, .49,
.45, .40, .34, .27, .19 and .10. The ?gures given
in top and bottom connecting tubes or bushing
are relative and may be considered as decimal
45
elements indicated at 23 and 24 (Fig. 3).
portions of an inch, in constructing a lay suit
A ‘number ofyears of personal experience and
able for use with a reed whose active vibration
aid ‘to others as well as instruction in the use of.
portion is of the order of one and one-half (11/2)
arti?cial larynges coupled with numberless ex
inches. In the example shown, the line Y~—Y
periments and modi?cations of existing types of
may be taken as indicating a plane containing
these devices, has led this applicant to the con
a longitudinal center or median line, or axis of
clusion that in a mechanical larynx employing
the voice box. The form of curve obtained by the
a beating reed and lay, the correct design of lay
ordinates and abscissae above given, is rendered
is of utmost effect on voice quality. This feature
more apparent by a relative exaggeration of the
being of extreme importance, will accordingly be
X dimensions to values ten times their actual
?rst described, it being ?rst noted that the de
proportion to the distances along Y—Y at which
sign presently preferred is predicated upon the
they are taken. From this exaggeration Fig. 11
use of a flat, non-metallic, preferably hard rub
has been derived, showing a lay pro?le curve
ber reed, the greater part of the length of which
which reveals that between Y values of 0 and 5,
is normally free of the lay and the vibrating
60 this ?rst third of the lay pro?le, proceeding out~
length of which is of the order of one and one
wardly from the anchored portion of the reed,
half (11/2) inches. In the structure shown, the
exhibits a relatively large slope, and is formed
plug ll which ?ts snugly yet removably into the
on a succession of large radii. Approximately
upper portion of the tubular voice box I5, is ex
the mid portion or central one third of the curve
tended downwardly in an integral portion there 65 is formed on a succession of much smaller radii,
and reverses its direction from about the center
of, to constitute the lay generally indicated at
of the- curve outwardly, but departs somewhat
30. The lay extends from the plug over the
from true symmetry. The portion-5 described are
greater part of the length of the chamber 3%
of much greater effect and more nearly critical in
within the box, although this chamber is char
acterized by a lower unobstructed portion 32 for 70 control of tone quality than the ?nal one third
of the lay underlying the free end portion of the
the reception and entrapment of condensate and
reed, although the latter third preferably closely
saliva, if any. In order accurately to position the
follows the contour shown and described, in
plug H in the box, the latter is provided with an
which, as will appear from Fig. 11, the curve now
internal shoulder against which rests a corre
sponding undercut portion 33 of the plug, and 75 converging toward Y—-Y, may be' considered as
5
2,405,850
formed on a succession of large radii. The slope,
now opposite that of the ?rst third of the con
tour, is somewhat less than that of the ?rst third,
but substantially exceeds the slope of either part
6
the reed near the anchored reed end. The clip,
as will appear from Fig. 6, is susceptible of slid
ing movement along the reed, as indicated by a
comparison of the full line and dotted views of
of the central third of the pro?le or contour 5 the clip. The U-shaped clip iii-47 is, by pref
curve. While some minor deviation from the fig
erence, formed of a tempered stock, or tempered
ures and pro?le given, is possible, this pro?le has
after formation, so that it possesses a consider
been found optimum when employed with a rec~
able constrictive effect and thereby aifords a suf
tilinear reed such as 46 which is disposed at an
?cient degree of frictional engagement with the
angle to the line Y-Y, of an order not exceeding
lay, to remain in any practical adjusted po
limits of 5 to 19 degrees inclusive. The lay de
sition thereof. The advantages of this form of
sign contributes materially to a further import~
tone adjustment are found particularly in the
ant result, namely, a marked reduction in air vol
facts that it may be formed as a one-piece, low
ume and velocity required to attain a requisite
cost element; embracing the reed and lay snugly,
and normal volume of speech. This reduction in 15 it adds nothing to space requirements of the as“
effort of the user, enables continuous speech for
sembly incident to the provision of tone adjust
several hours, without noticeable fatigue.
ment; it is normally completely concealed, since
A further improvement in tone quality in the
disposed within the voice box, and the entirely
hands of various users, has been attained by a
internal arrangement avoids the otherwise un
careful control of the depthwise pro?le of chan- 5, sightly protuberances externally of the voice box
nel 36. The bottom of this channel, as will ap~
which characterize some of the older devices at
pear from the dotted line of Fig. 10, and from
tempting the same result. The provision of a
the contouring of Fig. 3, is in the form of a sub~
simple tone adjustment of this type enables a
stantially regular curve, being an are on a very
procedure which is of tremendous value in per~
considerable radius. This channel furthermore
sonalizing the instrument to the individual. In
is of greatest depth in that portion underlying
some cases ‘wherein, for example, removal of the
the anchored end of reed so and is gradually more
larynx is contemplated as by surgery, voice re
shallow in proceeding toward the outer end of
cordings of the individual may be taken in ad
the lay underlying the outer end of the reed,
vance of surgery so as de?nitely to establish not
the channel vanishing from the lay almost di~
only the pitch but other qualities of the voice.
rectly beneath the free tip of the reed 4!).
Following surgery or loss of speech for other
There should. be described for completeness a
reasons, the phonographic reproductions may be
preferred mode of anchoring or positioning the
used as a standard of comparison for the several
adjustments attainable by the present improve
reed in the reed holder, in the present case in
plug ll; this is provided with a reed-receiving 35 ments.
For the purpose of personalizing the instru
recess M into which is ?tted an insert of a corn»
pressively resilient water-repellent material such
ment to a degree heretofore unattainable, this
as cork, the insert piece of which is indicated at
applicant has determined that in certain cases
42 and which is normally of somewhat greater
an improved quality of arti?cial voice may be
dimensions than merely enough to occupy the 40 attained by the use of a multiple reed assembly
as suggested by Figs. 8 and 9 for example, show
socket 4!, and so when inserted in place over the
reed is sufficiently compressed to retain the reed
ing a highly satisfactory form of double reed.
securely in place, yet permit its ready removal
In this arrangement, each reed, a longer one
when desired.
being indicated at 59 and a shorter reed at 5|,
It is regarded as of great importance to pro
, may consist of beating type reeds of ?at sheet
vide a seat, in the socket 4| for receiving the reed,
hard rubber, or other preferably non-metallic
such as to present the reed over the greater por
material. A similar anchorage provision is pro
tion of its length, at such an angle to the lay
vided in the slot or socket 52 in which is disposed
that it normally lies and vibrates free of the lay.
the compressed cork ?ller element, as indicated
Experiments with different lay pro?les and an
at 53. The reeds are inserted in the position
gularity of reeds lead to the conclusion that
shown by the drawing in the socket 53 of a plug
there is a distinct advantage in permitting no
54 integrally depending from which is the lay 55
more than one-tenth of the vibrating length of
which is or may be similar in all respects to the
the reed, normally to make contact with the lay.
lay element as heretofore described. In the
It will be noted that this is borne out by the ac 55 double reed assembly, the arrangement is pre
companying drawing (Figs. 3 and 10), as well as
ferred such that the vibrating length of reed Si!
in other figures.
Proceeding now to a description of the pres
is approximately twice that of the reed 5|, with
the clip 45 in zero position. Although by no
means exclusively employed to advantage with
ently preferred means for modifying tone by con
trol of the effective vibrating length of the reed, 60 women patients, this arrangement enables a close
there is best shown by Figs. 6 and 7, a slidable
approximation of the natural female voice. It
clip for this purpose. This consists of a wide
will be understood of course that, as may be de
U-shaped element formed of ?at, non-rusting
sired, the tone or pitch control clip 45-47 may
metal stock, or of wire stock as shown. The tone
be employed with the combination shown by Figs.
control clip consists of an arcuate intermediate
bridge portion 135 ‘which is or may be of regular
curvature and which conforms to and snugly
8 and 9.
Yet another improvement which has been
found of tremendous advantage in relieving ‘the
embraces what may be referred to as the bot
vibratile assembly of certain objections which
tom surface of the lay 36. Connected to the ar“
appear in the hands of some users, is the expe
cuate portion 45 are a pair of convergent arms 70 dient of‘perforating the beating reed, or the low
46 (Fig. 7), these arms lying closely adjacent cor
ermost such reed as indicated at 56, in the case
respondingly shaped portions of the lay, in the
region thereof gripped by the clip. Each of the
arms 48 terminates in an inturned tang til’, the
of multiple reed assembly. The perforation, one
example of which is indicated by the small cir
cular opening 68 (Fig. .9), is preferably located
tangs 47 transversely overlying that portion of 75 about centrally of the length of the reed and
2,405,850
7
preferably also about centrally of the reed in a
transverse direction. In any event, in the case
of a multiple reed assembly, the opening 60 is
located so that it will not be covered or obscured
by the overlying reed end. Various forms of
opening 60 have been tried, and while all thereof
have proven useful for their intended purpose, it
8
pose so as to enable shipment, or carrying the
instrument in the pocket, in the least possible
compass.
It will now have appeared that the
device in its present highly developed construc
tion serves fully to attain each of the several
objects speci?cally above enumerated, and many
others implied from or expressed in the ensuing
is preferred to provide the opening 60 with
description.
or reamed opening which is small, usually not
exceeding ate," in diameter and in most cases,
be understood solely as instructive, and not in
any limiting sense, numerous variants being pos
Although the invention has been described by
rounded margins rather than rectilinear or
square margins characterized by corners. The 10 making detailed reference to certain presently
preferred examples, the detail of description is to
most satisfactory arrangement is a simple drilled
1&4". In making tests with this improvement, a
small opening is ?rst provided which may be re
drilled or reamed gradually to enlarge the open
ing to ascertain optimum results. This feature
has been found particularly useful in the case of
sible within the scope of the claims hereunto
P‘ appended.
I claim as my invention:
}
1. In a reed assembly of an arti?cial larynx, a
reed of beating type, a reed backing element or
lay, a lay and reed support by which one end of
certain male users whose arti?cial voices are
characterized by an unwanted volume and who ‘in the reed and one end of the lay are carried, and a
sound box enclosing the reed and lay, the lay
experience a dii?culty in modulation of air vol
being longitudinally channelled over that portion
ume and pressure applied to the instrument.
The provision of the reed aperture renders much
less critical the varying amounts of air supplied
to the instrument.
A further improvement of a highly practical
of its length which is coincident with the reed,
the lay being irregularly curved in longitudinal
section, in such manner that the portion of sub
stantially one-third of the length of lay proper,
just beyond the sup-ported end of the reed, is
characterized by a succession of relatively large
nature consists in a novel provision for relieving
the sound box 15 of moisture accumulating in
radii of curvature and a high degree of slope, the
ternally thereof incident to protracted usage.
Such accumulation of moisture is primarily con 30 intermediate one-third of the effective length of
the lay being convexly curved on distinctly lesser
densate, but may in some cases consist in minor
radii and exhibiting a markedly lesser degree of
proportion of saliva entering the box through
slope, and the outermost effective portion of the
the mouth tube 22. The provision of manual
lay
being characterized by a succession of rela
valves and other expedients for removing this
moisture introduces a structurally undesirable 35 tively large radii of curvature and a greater slope
than any portion of the intermediate portion.
condition and renders the instrument less sus
2. A reed assembly for an arti?cial larynx, in
ceptible of thorough sanitation. Accordingly, in
cluding a reed of beating type, a lay, an element
lieu thereof, there has now been provided a self
supporting corresponding ends of the reed and
clearing moisture removal feature found in the
lay, a sound box about the reed and lay, closed
40
construction of the bottom closure element 5|.
at one end by said supporting element, the lay
It will best be noted from Fig. 3, that this plug or
being curved over its effective length underlying
closure is located appreciably below the lowest
the reed and characterized by a curvature on a
part of the connection 2(l—2Ll so as to form a
succession of large radii at each end portion and
well in the lower portion of the unobstructed
chamber 32. The upper portion of member 61 is " a succession of much lesser radii of curvature and
of convex form in its intermediate portion, the
formed as an irregular funnel, so that its surfaces
reed
being supported so as, when in non~vibrating
converge from the box walls and from the upper
relation, to be disposed distinctly out of contact
funnel margins toward a capillary drain conduit
with the reed over at least ninety ‘percent of the
62. The provision of a capillary passage in this
effective vibrating reed length.
zone acts, through surface tension, normally to
3. The combination and arrangement of ele
retain a slight amount of moisture, as same ac~
ments as recited by claim 2, but further char
cumulates, in the bottom of the sound box. Any
acterized in that the lay is formed to provide a
unwanted excess is however periodically expelled
pair of distinctly outstanding, substantially paral
through the opening 62 due to normal air inlet
pulsations. Only a very moderate pressure in 55 lel edge portions, the transverse spacing of which
is substantially less than the width of the reed,
the chamber 32 being necessary to overcome the
and in which arrangement the said irregular
surface tension of the liquid and to aid in its
periodic expulsion by gravity, this arrangement
has been found very satisfactory, particularly
curvature is imparted to said edge portions, the
edge portions being presented toward the reed.
Ll. In the reed assembly of an arti?cial larynx,
under conditions of long outdoor usage of the (SO
a
beating
type reed, a reed lay, the reed and lay
instrument in cold weather, but is also of ad
being supported in a voice box or the like with the
vantage under all temperature and humidity con
reed free of the lay over at least 90 percent of the
ditions.
vibrating reed length, the reed being substantially
The device as described and embodying present
improvements or some thereof, has been found 65 flat and rectilinear in longitudinal and transverse
sections, the lay being formed to provide a sur
more nearly to approximate the human voice
face in the region of and opposite the reed, which
after a moderate period of experience therewith
surface is of irregular curvature, being formed on
by the user, than any instrument for a similar
a succession of relatively large radii close to the
purpose now in existence. By making it through
anchored end of the reed, characterized by an
out, with only unimportant exceptions, of non
arched
intermediate portion curved on substan
metallic, impervious non-resonant materials, it
tially lesser radii, and an outer portion curved on
may be at the same time constructed of minimum
large radii and approaching a ?at aspect, but
weight and bulk. It should be noted that the
with
all said curved portions of the lay formed on
tube 22 through the provision for rotation of cap
16 may be easily swung aside for any desired pur
75 substantial radii markedly exceeding the length
9
2,405,850
of the reed, the reed being disposed at an angle
to a chord line connecting the ends of the said
curved lay portion, which angle is within limits
of the order of 5 to 10 degrees.
5. The combination, structure and arrangement
of elements as recited by claim 4, but further
characterized in that the irregularly curved sec
10
a combined reed holder and lay, an inner reed
and an outer reed, the reeds being of beating
type, the outer reed being of a length substan
tially of the order of one-half of that of the inner
reed, the outer reed overlying that portion of the
inner reed nearest the zones of anchorage of the
reeds, and both said reeds being of a ?at non
tion of the lay is imparted to edge-like projecting
metallic sheet material.
portions extended toward the reed from the lay,
12. The combination, structure and arrange
Which edge portions constitute the sole zones of 10
ment of elements as recited by claim 11, but fur
engagement of the greater part of the reed
ther characterized in that the inner reed is pro
length, with the lay.
vided with an aperture substantially intermediate
6. The combination and arrangement of ele
the vibrating length of the reed, and intermediate
ments as recited by claim 4, in which the said _ its side margins, the aperture being located be
chord line connecting extremities of the irregu
yond the outer reed, so as not to be obstructed
larly curved portion of the lay, lies substantially 15 thereby.
parallel and close to a longitudinal median plane
13. In a reed and lay assembly for an arti?cial
of the voice box.
larynx, a reed of beating type, a lay, an element
7. In a reed assembly of an arti?cial larynx, a
supporting corresponding ends of the reed and
reed of beating type, a lay, a voice box enclosing
lay, a sound box about the reed and lay, the lay
the reed and lay and including a lay and reed 20 being curved over its effective length underlying
support, the lay being longitudinally channelled
over that portion of its length coincident with the
reed, and the lay being irregularly curved in the
the reed, substantially the ?rst one-third of the
lay, beyond its supported end, closely approaching
a rectilinear contour but exhibiting a slight con
portion presented toward and in the region of the
vexity, the adjacent portion of substantially one
reed and being characterized by a relatively high 25 third of the effective length of the lay being ap
slope and formed on large radii of curvature, both
preciably arched and convexly presented toward
near the supported end of the reed and near the
the reed, the lay surface being continued into a
free end of the reed, with a distinctly arched por
portion most remote from the supported end of
tion formed entirely on lesser radii of curvature
the reed, in a distinctly diverging relation thereto.
and located between the ?rst said portions, the 30
14. The combination, arrangement and con
lay being formed to present said curved portions
formity or" elements as recited by claim 13, but
as edge-like elements toward the reed, with the
further characterized in that the lay is provided
channel of the lay therebetween, said channel
with a longitudinal channel, and in which the
being depthwise formed substantially as a regular
stated irregularity of curvature is imparted to a
35
are on a substantial radius, and gradually in
pair of parallel edge portions extending longi
creasing in depth, from a zone near the free end
tudinally of the lay, and constituting the sole
of the reed, rearwardly or toward the anchored
areas of possible contact of the lay by the reed.
end thereof.
15. In a reed and lay assembly of an arti?cial
8. The combination and arrangement of ele
larynx, a beating type reed element, a lay ele
40
ments as recited by claim 7, but further char
ment, 2. spring member substantially embracing
acterized in that the reed is a substantially ?at
both said elements and freely slidable therealong,
beating type element of sheet hard rubber, and
the spring member being constrictively resilient
when in non-vibrating position, is free of engage
and thereby tending frictionally to maintain an
ment with the lay over at least ninety percent of
adjusted position along said elements, the lay
the vibrating length of the reed.
element being of irregular curvature, character
9. In an arti?cial larynx, a beating reed as
ized by a slight convexity over substantially one
sembly including a lay and two beating reeds of
third
of the vibrating length of the reed element,
substantially different length and mounted in
and therebeyond being characterized by a dis
superposed relation.
tinctly curved portion arched convexly toward
10. In a reed assembly for an arti?cial larynx,
the
reed element, thence being extended from the
a reed holder including a lay and a pair of beat
said arched portion in a markedly divergent rela- I
ing type reeds, the reed holder having a socket
tion to the reed element, said irregular lay curva
adapted to receive the supported ends of both
ture and the relation of said elements and the
reeds, the reeds being of substantially similar
spring member being such that movement of the
shape, but of substantially different length, the 55 spring
member for adjusting purposes, serves si
anchored end of each reed extending into the
multaneously
to effect both a variation in vibrat
socket therefor, and a reed-anchoring element
ing length of reed, and the cooperative relation
compressed in the socket and overlying the ad
ship between the reed and lay elements.
iacent ends of the reeds.
60
11. In the reed assembly of an arti?cial larynx,
OT'I'IE ROBERTS,
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