US2385867A - Throat microphone - Google Patents

Description

Oct.. l2, 1945.

J. M. KUHLIK THROAT MICROPHONE Filed Oct. l5, 1943 Patented Oct. 2,' 1945 s PATENT 2,385,857 THROAT MrcnornoNE Aspiration capter 15, 194aseril-nafsfoas1o 101mm. (cina-#151) v` My invention relates to improvements in microphones and more specifically to a new and improved throat microphone for use in aircraft, submarines, military tanks and defense plants and in all other places which are very noisy.

The use of a throat microphone, for instance, is of particular advantage for a pilot who while flying in a plane must report what he sees and hears. Prior to rthe introduction of throat microphones, a pilot had to write his messages and the like down, and due to atmospheric conditions, vibrations, abrupt movement of the plane, resulting from air pockets, air sickness, etc., the pilots hand becomes more or less unsteady so that he frequently could hardly read his own Writing when on the ground. A throat microphone, however, enables a pilot to transmit his messages immediately over the existing radio equipment in the plane to a receiver or recorder on the ground. Moreover, a pilot using a throat microphone has both hands free for operating the plane.

Throat microphones hitherto in use were of the carbon type and had various disadvantages which prevented them. from being used extensively; among these disadvantages, was the difficulty of eliminating disturbing noise, unreliable Working particularly at low temperature in high altitudes, Ithe necessity of frequent repairs and replacement of par-ts, and the like.

the wearer which may be amplied and transf mitted through a public address system.

Another object of the present inventionis the provision of a throat microphone which eliminates all outside noise so that no matter how much noise there may be in a plant none of the noise will be transmitted through the throat microphone, and the speaker need only use an ordinary tone of voice thereby doing away with the necessity of shouting or straining the voice.

Still another object of the present invention is the provision of a throat mocrophone which can be used with any standard amplier designed to use a crystal or other high impedance microphone.

A further object of the present invention is the provision of a throat microphone which safely transmits even the mildest tone with unusual clarity so that a code system may be developed whereby tapping with the fingers may or the microphone isun'able to speak due to in'- ,jury'or for anyother-reasonr;

' AV still further object ofthe present invention isA the Aprovision of a throatv :microphone which if.` light fin: weight, simple construction -so that it canv -b'efmanufactured 'atr a-.very reasonable price, but whichfis well adapted. toa-withstand the rough usage to which such devicesare'frequently Sill'ietild.` .i 4 V:, 11i mrtherbbjects of the instant invention reside in any novel feature of construction or operation or novel combination of parts present in the embodiment of the invention described and shown -be used instead of spoken Words in case the user in the accompanying drawing Whether Within or without the scope of the appended claim and irrespective of other specific statements as to the scope of the invention contained herein.

In the drawing:

Figure 1 is a plan view of a preferred embodiment of the invention;

Fig. 2 is a side elevation; v

Fig. 3 is a front elevation view of a detail of the embodiment shown in Figs. 1 and 2, drawn on an enlarged scale; and

Fig. 4 is a sectional View on the lines 4 4 of Fig. 3.

Similar numerals refer to similar parts 'throughout the several views.

Microphone and sound box which will be described hereinafter are contained within a small bag or pouch I of leather or any other suitable material carried on a neckband 2, the Width of which can be adjusted by means of several press buttons 3 and which is preferably provided With an elastic portion 4 such as a rubber band or the like. The microphone itself, which is preferably based on the inductor-dynamic principle, is placed into a sound box of Wood or of any other suitable material. The sound box Which is preferably rectangular in shape and has rounded corners and edges at its outer side, consists of a bottom portion 5 and of side portions 6 and is open at its top as may be seen in Fig. 4. The microphone is placed into the sound box in such a manner that the diaphragm 1 is adjacent to the open top portion of the sound box, and the sound box in turn is placed into the pouch I in such a manner that the bottom 5 is adjacent to the larynx of the person wearing the throat microphone. By means of this arrangement, which constitutes an important feature of my invention, the vibrations of the sound emanating from the larynx are transmitted directly to the bottom 5 of the sound box and from there to the side portions 6; thus the sound box, which acts as a ient pieces I I, which then act as cushions forthe the U-shaped piecev I0 rests eitli'rfdirectlyy resonance chamber, eliminates all outside noise the invention as applied to a single modiiicaas previously referred to. tion, it will be understood that various omissions v Whereas the construction of microphones of and substitutions and changes in the form and the inductor-dynamic type per se is no part of details of the device illustrated and in its operamy present invention, I discovered that best re- 5 tion may be made by those skilled in the art sultscan be attained by placing the magnet 8 Without departing from the spiritl of the invenand the coil 9 in a U-shaped piece of metal I0, tion. It is the intention, therefore, to be limthe anges of which carry the diaphragm V'I. I ited only as indicated by the scope of the followpreferalso to; make vv the diaphragm/slightly VVingrclairr1. l, r. s Y, l curvedra'sfkillustrated in Figfi, andiA to secure 10 Having'thus described my invention, what I pieces II of 'resilient'materiaL preferably'of rub-'- claim and desire to secure by Letters Patent in ber to the anges of the U-shaped piece IIJ sox ,t the United States is:

that the diaphragm 'IA rests against these resil- VA throat microphone comprising a rectangular sound box having an open side and having rounded outer corner portions, a U-shaped piece diaphragm 1. If the microphone is constructed in the manner previously described,' `-the` vvebfo Y a manner that its web rests against pieces of against the bottom 5 of these/undy box or against'- resilient material at vthe bottom of said sound additional resilient (rubber) pieces I6, which box, an, electromagnet arranged Within said may be inserted between the bottom Sand the r2'0' U'sh'ap'ed piece and provided with a pole piece Ushaped piece IU as shown in Figwi.y .One 'of directed towardthe. open side of said casing, a the side portions 8 of the sound boxis provided slightly curved diaphragm adjacent said pole with an' aperture I2, and the pouch l, I'is provpiece and supported acrosssaid U-shaped piece vided with an aperture I4 V(Figs. land 2) which by resilient V`material which isVY carried by the registers `with the aperturev I2...IElexiblef-'insu 25 anges of said U-shaped piece, and means for atlated Wires I5 adapted to connect'the microphone tachingv said sound box to the throat of a person lto 'an'ampliiier are extended through the aperf in such a manner that his larynx is adjacent to tures I2 and I4. 1 l the bottom'of said sound box, all substantially as While there has been shown and described'and set forth.- t

pointed out the fundamental novel 4features of 30 JACOB-M. KUHLIK.

f-metalinoi1nted Within said sound box in such

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