US1195783A

US1195783A - Island

Info

Publication number: US1195783A
Authority: US
Publication date: 1916-08-22
Anticipated expiration: 1933-08-22

Description

W H- CRAWFORD.

SOUND AMPLIFIER.

APPLICATION FILED APR. 17. 1915.

1,195,783. Patented Aug. 22,1916.

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UNITED STATES PATENT OFFICE.

WILLIAM H. CRAWFORD, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR 0F ONE-HALF TO SOUND-AMPLIFIER.

Specification of Letters Patent.

Patented A11 22, 1916.

Application filed April 17, 1915. Serial No. 21,9.

To all whom it may concern:

Be it known that I, l/VILLIAM H. CRAW- Form, a citizen of the United States of America, and a resident of Providence, county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Sound-Amplifiers, of which the following is a specification.

This invention has reference to improvements in phonographs, graphophones, talking machines and the like which are used for recording and reproducing music, articulate speech and other sounds.

Assuming that sound is to be reproduced then the stylus carried by the sound-box passes through the record grooves and repeats the original vibrations in the diaphragm. In this way the sound is reproduced and passes from the reproducer or sound box through the reproducer connection into the sound amplifying or megaphone horn. The reproducer connection is made of metal while the sound amplifying horn is made of sound resonating material. such as wood and the like. The metallic reproducer connection, however, acting as part of the sound amplifying means is the cause of shrieking sounds and secondary noises which are not transformed by the sound resonating horn, but further amplified. Accordingly the quality of the tone is impaired and especially at the beginning of the reproduction of sound from a record shrieking sounds and secondary noises are disagreeable and disturb the impression on the mind. of the listeners. Furthermore, in most phouographs the sound waves passing through the reproducer connection strike against curved inner walls of the amplifying horn or intermediary parts, sometimes at a right angle thereto whereby said sound waves are thrown back instead of being deflected forward. It is evident that sound waves thrown rearward collide with sound waves passing in a forward direction whereby a disturbance is caused.

It is the purpose of the present invention to overcome the described defects. This has been primarily attained by constructing the reproducer connection of sound resonating materials, such as wood, hard rubber, celluloid and fibrous compositions whereby shrieking sounds and secondary noises are avoided. In order to deflect the sound waves properly I may provide within the reproducer connection sound deflecting leaves which divert the sound waves into the amplifying horn whereby the disturbances just described are avoided.

In order to render the invention entirely clear reference is had to the accompanying drawing in which Figure 1 represents in side elevation, partly in section, a phonograph with a reproducer connection composed of sound resonating material, embodying in desirable form the present improvements. Fig. 2 shows in longitudinal cross section a somewhat modified form of the reproducer connection. Fig. 3 is a front View of the device illustrated in Fig. 2.

Similar characters of reference denote like parts in all the figures.

In the drawing, or represents the phonograph box, 6 is the record support and 0 illustrates a record disk. The reproducer or sound box (Z carries the stylus e which travels in the grooves of the record disk. From the reproducer or sound boX the reproducer connection extends in the direction of the sound amplifying horn or megaphone g. The reproducer connection f is a conical tube which is composed of sound resonating material such as wood, hard rubber, celluloid, artificial fibrous compositions and the like. A curved tube h connects the reproducer tube 7 with the sound amplifying horn g. This tube It also is composed of one of the sound resonating materials herein specified.

In the described construction there is no intermediary part between the sound box and the amplifying horn which is composed of metal or other materials spontaneously detrimental to the quality of the reproduced sound. Accordingly the sound issued by a phonograph embodying the present improvement is free from shrieking and secondary noises, it is euphonious and greatly improved.

In Figs. 2 and 3 of the drawing a somewhat modified reproducer connection is illustrated. The conical reproducer tube i, composed of sound resonating materials, is provided with sound deflecting leaves j, is, Z, made of the same material of which the tube is constructed. These sound deflecting leaves are curved in conformity to the inner surface of the tube as shown in Fig. 3. As the sound is to be diverted in a certain direction these leaves are so arranged that the sound is diverted in the desired direction. In the example illustrated the sound is to be diverted in a downward direction, therefore the sound deflecting leaves are located in the upper portion of the reproducer tube 2'. In this way I avoid that the sound waves impinge upon the inner wall of the curved connecting tube It in such a manner as to be thrown rearward. On the contrary the sound waves are properly diverted and no disturbance in the course of the sound waves takes place. The sound defleeting leaves accordingly aid in the production of harmonious tones.

I claim as my invention:

1. A sound amplifier, comprising means for reproducing sound, a short curved tube of sound resonating material, a conical reproducer connection composed of sound resonating material between said means and curved tube, and sound deflecting leaves within the connection arranged in one longitudinal section thereof.

2. A sound amplifier, having means for reproducing sound and a sound amplifying horn, an intermediary conical reproducer connection transmitting sound unobstructedly in a straight path and composed of sound resonating material, and provided with sound deflecting means within the said con nection arranged in one longitudinal section thereof.

Signed at New York, I\. Y, this 16th day of April, 1915.

l VILLIAM H. CRAWFORD.

Witnesses:

IDA E. ROLAND, ELEANORE J. HorrMANN.

tloplea of this; patent may he obtained for five cents each, by addressing the "Gommisaioner of Patents,

' Washington, D. G.