close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Nov. 5, 1946. _
' A. V.‘MOT$|NGER
‘2,410,454
VOICE~TRANSMITTING GAS MASK
I
Filed May 17, 1938
v
,3 Sheeté-Sheet 1
IN VEN TOR. ,
'
‘
Armand lVMotsinyer"
BY
'
Y
‘A ATTORNEY
W- 5, 1946.
A. v. MOTVSINGER
2,410,454
VOICE-TRANSMITTING GAS MASK I
Filed May 17, 1958
V 3 Sheets-Sheet 2
_
INVENTOR.
Armand VMotgi n98?
BY
~
M
A TTORNEY
Nqv. 5, .1946;
.
A. v; MOTSINGER
2,410,454
VOICE-TRANSMITTING GAS ‘MASK
Filed May‘ 17, 1938
5 Sheets-Sheet 3
27
28
FIG. .9
1-76. /0 .
INVEN TOR. '
BYA rm and. V- Motsinyer
- M
A TTORNEY
Patented Nov. 5, 1946
2,410,454
UNITED STATES PATENT OFFICE
2,410,454
VOICE-TRANSMITTING GAS MASK
Armand V. Motsinger, near Aberdeen, Md.
Application May 17, 1938, Serial No. 208,408
12 Claims. (01. 128-141)
(Granted under the act of March 3,‘ 1883, as
amended April 30, 1928; 370 0. G. 757)
The invention described herein may be manu
factured and used by and for the Government for
governmental purposes, without the payment to I
me of any royalty thereon.
This invention relates to voice-transmitting
gas masks and has for an object to provide a gas
mask through which a person can talk without
the use of electrical or other outside energy.
2
Fig. 9 is a cross section on line 9-9 of Fig. 8
showing an acoustical chamber which can be
varied in shape and size to respond to various
voice characteristics.
Fig. 10 is a rear elevation of the angletube with
adjustable chamber shown in Figs. 8 and 9.
Corresponding and like parts are referred to
in all the views by like reference characters.
Another object of this invention is to provide a
A diaphragm when transmitting speech does
diaphragm which will readily transmit the human 10 not resonate at one frequency but must vibrate in
voice.
therange of frequencies corresponding to the
Another object of this invention is to provide a
sound box or acoustical chamber next to a dia
phragm in order to increase the transmission of
voice range. The kinetic energy must be over
come at each cycle and since the power available
speech through the diaphragm.
in the voice is low, the kineticlenergy of the dia
Another object of this invention is to provide a
facepiece of a gas mask with diaphragms and
acoustical chambers on either side of the facepiece
which may respond to different sound fre
phragm is formed. of a plurality of separate plies
15 phragm must be low. Therefore ‘the diaphragm
Another object of this invention is to provide a
must be as light in weight as possible. For use
sound box or acoustical chamber that is adjusta
in gas masks the diaphragm must be mechani
-- ble so as to conform to the individual voice of
cally strong and of a material to prevent the pas
the wearer of a mask or to the sound character
sage of gases.
.
istics of a given mask.
20
In accordance with this invention the dia
quencies.
With the foregoing and other objects in view,
the invention consists in certain novel features of
construction and arrangement of parts as will be
more fully disclosed in connection with the ac
companying drawings.
In the drawings:
Fig.1 is a sectional view on line I-l of Fig. 2 of
a facepiece of a gas mask in place on the face,
showing the position of the acoustical chamber
and diaphragm.
Fig. 2 is a front view of a facepiece, in place on
a man’s head, showing the diaphragm in the
of material secured together only at their peri
pheries. Diaphragms made of cellulose deriva
tive such as “Cellophane,” cellulose nitrate, or
cellulose acetate, have been successfully used,
with two to five plies. Preferably four plies of
cellulose acetate are used, each ply about one
thousandth of an inch thick, as this assembly
,a?ords mechanical strength, impermeability to
gases, resistance to deterioration, and vibration
range to accommodate the human voice. A suf
?cient number of plies must be used to prevent
chatter.
,
_Voice diaphragms of individual plies secured
only at their edges have a very small energy loss
since the separate plies may vibrate individually.
A diaphragm made in this way has no undesirable
front part of the facepiece.
.
resonance since the separate lamina dampen the
Fig. 8 is a front view of a facepiece, in place
adjacent lamina.
on a man’s head, showing angletubes with dia 40
Gas mask facepieces are usually formed of
phragms on the side of the facepiece.
?exible material to conform closely to the wearer's
Fig. 4 is a front view of an angletube of a face
face. In order to avoid a plurality of connections
piece showing de?ectors in the acoustical chamber
to the facepiece, it is common practice to provide
and position of the diaphragm.
one rigid member formed of metal, which is con
' Fig. 5 is a section on line 5—5 of Fig. 4 showing 45 nected to the facepiece and by which the air enters
a diaphragm and acoustical chamber with sound
and leaves the facepiece. This member, which
de?ectors.
also serves to hold the facepiece in shape and pre
Fig. 6 is another variation of angletube having
vents collapsing due in inhalation, is known in
an’ acoustical chamber. It shows the acoustical
the trade as an angle tube‘ and is so designated
chamber with holes around the edge for entrance 50 herein.
of sound.
Fig. 7 is a sectional view on line 1-’! in Fig. 6.
Fig. 8 is a front elevation of an angletube show
Referring to the drawings, the plied dia
phragms H formed of a plurality of plies of cellu
lose derivative is secured at its periphery against
ing an adjusting device for changing the sound
a gasket 12. From‘ Figure 1 it will be noted that
characteristics of the acoustical chamber.
55 an angle tube [4 is suitably secured in a gas-tight
~ '-
r
r
2,410,454.
4
against a bell crank 33. Crank 33 is pivoted at
34 to the angle tube, and its inner end engages the
manner to the ?exible facepiece [5, has an under
cut annular ?ange l6 against which gasket [2 is
pressed. Diaphragm l I‘ and gasket l2 are secured
resilient back 21. Thumb screw 3| may have a
numbered dial for cooperation with a mark 35 on
in place by a crimped rim ll of the metal acous
tical box i8. Acoustical box i8 is a cup-shaped
the strap 32.
Two angle tubes with diaphragms and acousti
cal chambers may be mounted in ",the; cheek por
tions of the facepiece as seen in Fig. 3. ~One angle
tube 36 may have its acoustical chamber arranged
to respond more ei?ciently to a tenor voice, the
member with its rim progressively decreasing in
depth from (the upper‘ to the, lower portion, as
seen in Figure 1.
The bottom of box 18 has a
plurality of openings i9 arranged adjacent the
upper portion and in front of the wearer’s mouth.
The gasket I2 engages against a beveled surface
on flange IS, the arrangement being such that as
the rim i1 is crimped in placeyandr as'pressure- is
applied to diaphragm l I the gasketi 2 is displaced
outwardly to thus evenly stretch the diaphragm.
. ,other. angle tube 31 to a bass voice, thus giving
a widerrange of voice transmission without re
;sorting'_1toy;an adjustable acoustical chamber.
"The optimum size and shape of the chambers for
" a certainshape of facepiece may be determined
Since there is not twisting action in stretching
the diaphragm, there is no tendency to wrinkleor
break the thin diaphragm.
bye-talking tests or by impressing known sound
waves within the iacepiece at various frequencies
, and measuring‘the sound transmitted through
the diaphragms.
A rubber outlet valve 2! may be secured to an
It will be understood that the invention is not
‘outlet ‘nipple 22 on the angle tube Hi, and an inlet 220
limited
to- the precise details herein shown and
*hose to inlet nipple-38. It has been found that
described by .way ‘of illustration, since many
‘the sizeand shape of the acoustical chamber
lior-m'ed by a box l8 aiiects the sound transmitted
through the diaphragm, and: the shape and size
of‘the chamber varies for‘ different voices.
For ~
average voices, the’ back‘ or bottom of chamber
118 should be placed at an angle of 15° to the
changes and variations may' be made therein by
those skilled in the art without departing from
‘the-spiritoi ‘the invention nor exceeding the
scope of the appended claims.
'
‘I claim:
7
1. A voice transmitting gas mask comprising a
viacepiecaand a diaphragm therein in voice trans
‘ Voice transmission may be further improved
'by'ba?les within‘ the acoustical chamber. As seen i150 mitting relation to the‘ mouth of the wearer, said
diaphragm formed of a plurality of layers of thin
in Figs; 1,4 and 5, a bai?e 23 having-a curved
diaphragm ll.
‘upper'edge to engage the acoustical box extends
-ldownwardly'~at an angle of‘ about 42° to the base
orback 48 of the'box. I Two side bail‘les 28 of sub
~stantial1y triangular shape extend from ba?ie 23‘ .
r-downwardlyratabout 65° to bai?e 23. Ba?les 23
'andsidj justclear'diaphragm‘il to allow free vi
bration thereof.
The openings l9, andbafiles 23 and‘24 concen
trate- the voice ‘sound waves to the center of the
diaphragm, thus increasing the e?iciency of sound
transmission.
»
‘In ‘Figs. Sand '1 is'shown another shape of
acoustical chamber. In this form the back 25 of
;the acoustical‘ chamber is in the shape of a cone,
’ with ‘ the innerv point out of engagement with
‘gas-resistant material'secured together only at
men edges and stretched taut.
'
' 2.v The invention as de?ned in‘ claim 1 wherein
said diaphragm is formed of a plurality of layers
of a cellulose derivative.
'
'
'
3.‘ The invention as de?ned in claim‘ 1 wherein
said diaphragm is formed of a plurality of layers
~cf cellulose acetate.
4. In a voice transmitting: mask, a sound box
having a perforated bottom, an angle tube, a
diaphragm formed of a plurality of plies of cellu
lose derivative positioned between said sound box
and angle tube, and means to secure said sound
' box and angle tube together and simultaneously
stretch said diaphragm, said plurality of plies
beingsecured only at their edges.
diaphragm H. The side of the cone makes an
5. YA voice transmitting gas mask comprising a
angle of about 15‘L to the diaphragm. Sound en
'fa'cepiece, an annular cup-shaped angle tube 'se
ters the chamber through openings 26 in the cone.
‘Thisfchamber is also crimped to the angle tube 50 cured therein, a voice-transmitting diaphragm
[to secure the diaphragm in place, as previously . closing said angle tube, said'lidiaphragm being
formed of a-plurality‘of separate layers of-mate
described, the acoustical chamber being on the
inside of the facepiece.
fsince thetype of voice andthe interior cavity
ofthe iacepiece affect'the sound transmitted by
‘ ajdiaphragm when used with an acoustical cham
ber, it is sometimes-desirable to make the acous
\tical chamber-adjustable to accommodate it to
‘rial securedltogether only at their edges,v said
‘angle tube having anuannular lip having a- dia
phragm engaging surface at an angle to the
:plane ofwthe diaphragm, saiddiaphragm-being
pressed 'againstsaid surface to thereby stretch
the diaphragm.
'
6:, Theinvention as'de?ned in claim- 5 wherein
asound
box is secured to said angle tubewithin
60
this form, the chamber has a resilient back 21
the facepiece to concentrate sound waves on the
--sui-tably secured to a metal cup 28 which in turn
_ different voices, as seen in Figs. '8, 9 and 10.
In
secures the'diaphragm ii to the angle tube. ' By
~m'oving the back 21 in or out, the size and shape
“of the acoustical chamber may be varied to suit
'the-voice of the wearer. In the open'extended
position of the back, the acoustical chamber will
foestw?t- a tenor voice, whereas in the depressed
position the chamber will best ?t a bass voice.
v"Resilient back 21 has a series of holes 29 around
its periphery through which sound enters the
‘chamber.
The resilient back 21 may be adjusted by a
diaphragm.
-
5'7. Acvoice transmitting gas mask comprising a
facepiece, an angle tube secured vtherein, ajdia
‘iphragmiormed of a; plurality of plies of gas
."impermeable material, means to secure said'jdia
phragm across said angle tube, said -means§se
curingsaid diaphragm only around its edge, and
a‘fsound amplifying box on theinside'of said face
pie'ce forming a chamber having a perforated bot
tom, said bottom being positioned at; anjangle
to the diaphragm.
'
thumb, screwtf threaded to a strap 32 on the
i Q1181 ‘The invention asde?ned inclaim 'l_ ‘wherein
'jangIe'tube; the inner endoi the thumb screw ar
toward" the center of the diaphragm‘whereb’y
' ranged to press ‘the’ ?exible ‘facepiece'material l5
Said ampliiyins, bOXLhaS ba?les, tbereinsloring
5
2,410,454
voice waves are concentrated toward said center.
9. The invention as de?ned in claim 7, wherein
cooperating means are provided on the angle tube
and amplifying box to secure these members to
gether, said cooperating means also securing and
stretching said diaphragm.
10. The invention as de?ned in claim 7, wherein
said diaphragm is formed of three to ?ve plies of
cellulose acetate.
11. A voice transmitting gas mask comprising 10
6
12. A voice-transmitting assembly for gas
masks, comprising in combination, an angle tube,
a sound amplifying box joined to the angle tube
at one side of the latter, coacting means on the
angle tube and on the sound amplifying box pro
viding a joint therebetween, a diaphragm secured
within the con?nes of said joint with the mar
ginal edge only of said diaphragm being clamped
between the coacting means on the angle tube
and sound amplifying box, and said sound am
plifying box having a wall adapted to be ?exed
toward and away from said diaphragm, and
means accessable at the side of the angle tube‘
a facepiece, an angle tube secured therein, a dia
phragm formed of a plurality of plies of gas
impermeable material, means to secure said dia
phragm only around its edge, and a sound am
opposite the sound amplifying box for adjustably
plifying box on the inside of said facepiece, said 15 ?exing
said wall.
box having closed side walls and a perforated
bottom, said bottom being readily adjustable to
ward and from the diaphragm to thereby adjust
the size of the sound box to the voice.
ARMAND V. MOTSINGER.
Документ
Категория
Без категории
Просмотров
0
Размер файла
480 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа