Патент USA US2410454код 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.