US1602969A - Loud speaker - Google Patents

Description

Oct. 12 1926. 1,602,969

F. O. FARWELL LOUD SPEAKER Filed Feb. 26, 1926 Patented Oct. 12, 1926.

UNITED STATES FAY O. FARWELL, OF TOLEDO, OHIO.

LOUD SPEAKER.

Application filed February 26, 1926. Serial No. 90,727.

My inventionhas for its object to provide a loud speaker for the amplification of the sound waves produced by the diaphragm of a receiver which is so constructed that it 6 will reproduce more perfectly and with a more pleasing effect than is reproduced by the loud speakers now commonly known in the art.

It has been found that the higher tones, particularly, when produced staccato such as that produced by a flute, piccolo, violin or the higher tones of a piano, are reproduced more accurately by use of a speaker of the type of the ordinary bell shaped horn, but this type of speaker fails to reproduce the lower fuller tones of the piano, saxophone or cello and softer low tones of the voice or any instrument. It has also been found that a loud speaker having a large flexible diaphragm or disk, either flat or cone shape will reproduce the lower tones of the instruments and of the voice, but will not properly reproduce the higher tones as well as the bell shaped horn. By my invention I have pro- 95 duced a loud speaker that will reproduce both the high and low notes, and whether produced staccato or otherwise, and will soften the tones and produce a pleasing effect.

The invention may be contained in loud speakers that may be varied in their details of construction and arrangement of parts, and to illustrate a practical application of the invention, I have selected a loud r speaker containing the invention as an illustration of such structures and shall describe it hereinafter. The structure selected is shown in the accompanying drawings.

Figure 1 illustrates a front view of the loud speaker. Fig. 2 illustrates a side view of the loud speaker, a part being broken away to more clearly illustrate certain parts. Fig. 3 illustrates a section through the neck and shows some of the details of constructions.

The loud speaker 1 shown in the drawings has a substantial French horn shape, the tapering tube 2 of the horn being curved to conform substantially to a circle and extended into the hell or the prominent flare of the horn. It may be made of suitable fibrous or hardened pulp of the character commonly used in such horns. For pur poses of manufacture, the horns may be 55 formed of two parts 3 and 4, the part 3 constituting the body of the horn and the part 4 constituting the part located within the bell. The part 4 may be connected to a plate 5 that may be secured to the horn by any suitable means and so as to fit or form an extension of the I tapering tube. The neck 6 terminates in front of the diaphragm 7 that is connected to the armature 8 which is electromagnetically actuated in the manner well known in the art to transform the electrical waves of current into sound waves.

The diaphragm is connected to the armature by means of the rod 9 whereby the vibrations of the armature will be transmitted to the diaphragm 7 and the sound produced thereby magnified by the horn.

In order to produce a smooth clear tone 0 any pitch and to modulate the tone reproduction, I have found that by locating a somewhat soft pliable diaphragm of large diameter that such effects will be produced. As shown in the drawings, a cone shaped diaphragm 12 of comparatively stiii but thin fabric or of paper may be supported on the other end of the rod 9. A pair of cone shaped washers 13 may be used for clamping the apex of the cone, the rod 9 being threadanissu ed at its ends and a suitable nut 14 being used for pressing the washers against the inside and outside of the apex of the cone shaped diaphragm 12. Thus the diaphragm is supported coaXially with the bell 15 of the horn.

The loud speaker may be supported on a suitable base, such as the base 16, and a connecting wire 17 for connecting the loud speaker to a radio set may pass from the receiving instrument of the loud speaker through the horn and through the base 16.

I claim: 1. In a loud speaker, a horn having a bell portion and a curved tapering tube, the tapering tube terminating within the bell, an electromagnetically operated diaphragm located at the neck of the horn and means connected to the diaphragm for modulating the tones produced by the loud speaker.

'2. In a loud speaker, a horn having a bell portion and a curved tapering tube, the tapering tube terminating within the bell, an electromagnetically operated diaphragm lo cated at the neck of the horn, a flexible diaphragm of relative soft material connected to the first diaphragm.

3. In a loud speaker, a horn having a bell portion and a curved taperingtube, the tapering tube terminating within the bell, an

caied substantially in the center of i -6. diaphragm lothe horn.

l. In a laud speaker a horn having a; bell portion and a curved tapering tube, the tapering tube terminating Within the bell,

electroinagnetically operated diaphragm lo- 10 eaied at the neck of the horn, a flexible cone shaped dia ehragm connected to the first named diaphragm and located coaxially with respect to the bell of the horn.

in testimony whereof I have hereunto 15 signed my name to this specification.

FAY O. FAREWELL.

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