US1281550A

US1281550A - Device for aiding the hearing.

Info

Publication number: US1281550A
Application number: US8790016A
Authority: US
Inventors: Morris Friedman
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-03-31
Filing date: 1916-03-31
Publication date: 1918-10-15
Anticipated expiration: 1935-10-15

Description

M. FRIEDMAN.

DEVICE FOR AIDING THE HEARING.

APPLICATION FILED MAR. 3|. 1916.

1,21,55Q. Patented 001;. 15, 1918.

W 7 mm Mamm- 351 @Hozmcq an orc.

MORRIS FRIEDMAN, BROOKLYN,

NEW YORK.

DEVICE- FOR AIDING THE HEARING.

To all whom it may concern:

Be it known that I, MORRIS formerly a subject tria, having declared my intention of becoming a citizen of the United States, and residing in the borough of Brooklyn, city of ew York, county of Kings, and State of New York, have invented certain new and useful Improvements in Devices for Aiding the Hearing, of which the following is a specification.

FRIEDMAN,

invention relates to a device for aiding the hearing and it belongs to the class of microphonic electric devices used by pe sons who are hard of hearing or partially deaf in order to aid them in hearing. The 7 present invention relates more particularly to the instrument wherein the sound waves are translated into electrical pulsat1ons,'or

to the instrument commonly ca transmitter.

The object of my invention is to provide a device of this character lled the electrical pulsations in of louder reproduction in the reproducer, so that the device will be more efiicient than those heretofore made. Another object of my invention is to provide a device which will render the reproductions of sounds clearer and more'natural or more nearly like the actual sounds which act upon the transmitter. These results are accom lished by arranging the sound passages in the transmitter in a novel manner.

In the drawings forming part of this application,

Figure 1 is a sectional view through the middle of a transmitting instrument made in accordance with my invention, and in which view, the circuit is shown diagrammatically.

Fig. 2 is an enlarged sectional view of a portion of the diaphragm and its casing.

Fig. 3 is a sectional view, taken on the line 33 of Fig. 1,

Fi 4 is a sectional view on the line H of Fig. 1, and

Fig. 5 is a face view of the ing at the front.

device, look- Fig. 6 is a detail view. The device consists principally of a microphonic part including a diaphra, and sound receiving and conducting parts. The outer member or container consists o a casing or shell 1 which comprises a rear Specification of Letters Yatent.

of the Emperor of Aus- I which will be more sensitive to sounds and which will causethe circuit capable Patented Oct. 15, 1918.

Application ma mun :nf, 191a Serial m. 87,900.

wall 2 having an opening to receive therein the rheostat 3, which seats on the rabbet 4:, of a flange 5 around the outer edge of the wall 2; and of a second member 6 comprising a front wall 7 and a flange 8 around its edge. The flange 8 slides over or telescopes in relation to the flange 5 when the parts are assembled, so that the members 1 and 6 form an inclosure or sound chamber. The front wall 7 has one or more aperture 9 disposed at or near its central portion, and these apertures are here shown as countersunk, with the larger portion to the outside. The casing members inclose the microphonic device.

There is an interior shell or box 10 consists of front which have flanges 11, 12 and whichlatter are threaded, so that one screws into the other so that the two shell members when united form an interior chamber. The front member has a front wall 13, to which the carbon cup 14: is fastened by means of a screw 15 passing through the wall. This wall 13 is otherwise imperforate, or at least it is made so that sound waves may reflect upon'it but no apertures are provided for the sound to pass directly therethrough.

A diaphragm 16, preferably of the same material that diaphragms of this character are made of, is clamped against the member 17 by the flange 12 act'ng on its edge, and T have shown a paper washer 18 lying against the diaphragm edge known. 7

,The pockets 19 in the carbon cup are partly lled with small, loose carbon balls 20 which form in well known manner, a microhonic connection between the cup 14: and the diaphragm.

The rear wall 21 of the inner casing or shell 17, has perforations 22 in the form of an annular ring near the outer edge of which for purposes we the wall and these are preferably drilled on angles oblique to the plane of the wall, as shown in the drawing.

The rheostat 3 consists of an insulating support or disk which sets in the aperture in the wall 2 and flush with the outer surface of the wall; of coils of wire (not shown) ofiering different resistances to the flow of current in the circuit, according to how many such coils are connected in the circuit; and of contact points 23 connected with the several d with which points coils an the switch lever 24: cooperates. There is a position with the screws bushing Binding posts 29, on the casing memare adapted to be connected in series in a circuit which includes a source of current, such as the battery 31 and a receiver 32. The l comprise any well tion with the diaphragm. The circuit is the usual one employed in devices- 1 so that further description thereof is not lated b necessary here.

The device herein shown is generally hung or worn on the person using it so that the diaphragm is in substantially a Vertical plane in order that the microphone will be most sensitive to sound. If worn against the body, the wall 7 will be turned away from the body in order that the sound waves may freely enter the apertures 9 in the central portion of the wall.

s the sound waves enter the apertures 9 they spread out laterally and pass through the space 37 formed between the

walls

13 and 7. They then pass through the space 38 formed between the edge of the inner shell and the outer casing, and enter the space 39 between the rear wall 2 and the rear wall 21 of the inner shell. From there the waves pass through the annular ring of apertures 22 and then act u phragm. It is understood, 0 course, that the movements of the diaphragm are transy the microphonic electrical pulsations which pass through the connection intocircuit and are translated into soundwaves 1n the receiver.

I find that the improved results are accomplishe to a great extent by taking the and same at the

spaces

37, 38 and 39. The reimproved also by arranging the dedevice is not necesis required. invention, what I in havin a sound receivin o enln censhell spaced from said outer casing a soun space expanding laterally from said sound receivin said inner she I, a dia ragm in said inner Signed at the city, county and State of New York, this 24th day of March, 1916.

MORRIS FRIEDMAN.

e results were muchiinferior he inner shell and outer shell is the opening and passing around