US1538321A - Voice-transmitting device - Google Patents

Description

May 19, 1925. 1,538,321

' c. H. GUNN VOICE TRANSMITTING DEVI CE Filed June 20-. 923

minimu WWW T MIHHTIM ll 6 i m y m i T K r I k? if 1 I (/6 12 v ll f FT: S 17 J i 3 I N VEN TOR. (7h (Ill as H. Gun 12 Q mm ATTORNEY Patented May 19, 1925.

CHARLES H. GUNN, OF OAKLAND, CALIFORNIA.

VOICE-TRANSMITTING nnvrcn Applicationflle dlune 20, 1823. Serial No. 646,524.

To all whom it may concern:

Be it known that I, CHARLES H. GUNN, a citizen of the United States, residing at Oakland, in the county of Alameda, State of California, have invented certain new and useful Improvements in Voice-Transmitting Devices; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this ap lication.

his invention relates to a device for throwing the human voice through the air for a greater distance than it will ordinarily carry, the principal object of the invention being to' provide a device for the purpose which will take the place of, the megaphone usually used, and which, instead of ein held to the mouth by the speaker, will e in the form of a self sup orting yet portable stand, having a mouthpiece toward which the speaker will direct his voice without the necessity of his having to place his mouth directly against the mouth iece as is necessary with megaphones, but ronr which his voice will be carried to his audience clearly and with an increase in volume, as far away from the s eaker, within reasonable limits, as may e desired, without the speaker having to raise his voice above a natural speakin tone.

My device is a apted for use in speaking to any public gatherings, whether 1n halls or auditoriums or in the open air, and relieves the speaker both from the voice and arm strain incident to the use of a megaphone.v I

As above intimated, the distance to which the .voice may be thrown may be varied at the will of the speaker, and also the direction in which it will be projected relative to the speaker, within limits, may also be easily regulated and changed, without alteration of position on the part of the speaker.

The above and other objects I accomplish by means of such structure and relative arrangement of parts as will be fully evident from a perusa of the following specification and claim.

On the drawings, similar characters of reference indicate corresponding parts in the several views, in which: i

Fig. 1 is a perspective view of the device.

Fig. '2 is a vertical side section thereof.

Fig. 3 is a bottom plan view of the same.

In carrying out my invention in the preferred manner, I provide a base 1 mounted on threelegs 2, each individuall and swiv-. elly mounted on and projecting ownwardly from the base from between ears 3 thereon, clamping means being provided to hold the legs in any set position, such as for instance wing-nuts at on the swivel-pins 5 of the legs which pass through the ears.

Mounted on and projecting upwardly from the. base is a casin or container 6, preferably of wood an rectangular in shape, and surmounted by a top piece 7 arranged to serve as a book or paper support or for like purposes. The base members 6, and top 7 form a complete enclosure.

Mounted in the casin a short distance from the top thereof an extending transversely therethrough from'front to back is a tube 8 on one'end of which, outside the casing, is fitted a transmitting horn 9 of suitable size and shape, and on the other end a receiving born or mouthpiece 10. The

tube 8 preferably has an upward bend intermediate its. ends toward the member 10 so that the latter is facing somewhat upwardly and is thus in a goodposition to receive the voice from the mouth 'of the speaker, which would be ordinarily some- I what behind and above the mouthpiece.

Also the mouthpiece 10 preferably has a tube 11 of its own, slidable in the adjacent portion of the tube 8, so that the position of the mouthpiece relative to the casing may be adjusted to suit the convenience of different speakers.

Mounted on the base 1 inside the casing is an electric motor 12 which drives a horizontally disposed fan 13 thereabove. The motor and fan are enclosed in a hood 14: supported on the base and spaced from the walls of the casing. Above the fan the hood forms an inverted funnel 15 which terminates in a nozzle 16 projecting into the tube 8 and facing toward the horn 9.

The nozzle flares out somewhat. toward its outer end, so as to prevent any possibility of there being a whistling sound at that point as the air emerges. I

The base 1 below the motor is provided with orifices 17 a damper 18 being arranged thereunder so that the. sizes of said orifices,

through which air passes to the fan, may

be regulated to suit.

The entire casing 6, about the hood and tube 8, is preferably filled with cotton 19 or some similar material which will deaden any possible noise and vibration set up by the the voice of a speaker talking adjacent the mouthpiece, even though at some little distance therefrom, will be drawn into the tube 8 toward the nozzle, and will then be thrown from the horn by and with the blast of air issuing therefrom, so that the voice will be audible at a considerable distance from the horn, this distance being governed by the velocity of the air blast and by its volume, which in turn are governed by the speed of the fan and regulation of the damper.

To suit persons of different heights who may speak into the device, it is only necessary to adjust the legs to raise the level of the mouthpiece and casing as a whole. If it is desired to throw the voice either higher or lower, only that leg under the side of the device on which'the horn is mounted is raised or lowered, thereby similarly adjusting said a horn, and causin the outwardly issuing blast to be directe up or down.

From the foregoing description it will be seen that I have produced a device which substantiall fulfills the objects of the invention, an while I have here shown and described a specific arrangement of parts, I reserve the right to make such deviations from this showing as do not form a departure from the spirit of the invention, as defined by the appended claim.

Having thus described my invention, what I claim as new and useful, and desire to secure by Letters Patent is v A live voice transmitting device comprising a tube having an enlarged transmitting end, and a receiving mouth-piece at its other end, said tube being freely open from end to end, and means for developing an air blast at a point removed from the tube and discharging it into the tube at a point intermediate the ends of the tube and in the direction of the transmitting end whereby sound waves of the voice will be drawn freely into and through the open tube and discharged forceably out of such transmitting end.

In testimony whereof I aflix 111 Si ature.

- CHARLES G N.

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