US1360577A - Amplifier for sound-reproducing machines - Google Patents

Description

W. E. PUGSLEY.

AMPLIFIER FOR SOUND REPRODUCING MACHINES. APPLICATION FILED APR- 23. 1920 1,360,577, Patented Nov. 30, 1920.

2 SHEETSSHEET I.

awmmtoz W. E. PUGSLEY.

AMPLIFIER FOR SOUND REPRODUCING MACHINES. APPLICATION FILED APR-23, 1920.

1 ,360,577. Patented NOV. 30, 1920.

2 SHEETS-SHEET 2- witness v UNITED STATES PATENT OFFICE.

WILLIAM EDWARD P'UGSLEY, or GRAND RAPIDS, moment.

AMPLIFIER FOR SOUND-BEPRODUCING MACHINES.

Application filed April 23,

To all whom it may concern:

ie it known that I, WVILLIAM E. PUcsLnY, a citizen of the United States, residing at Grand Rapids, in the county of Kent-and State of Michigan, have invented certain new and useful Improvements in Amplifiers for Sound-Reproducing Machines and I do declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved amplifier for sound reproducing machines.

Devices of the above mentioned class are numerous and of many different types and constructions and each one, as a rule, has for its object to improve upon the other similar devices by amplifying and improving the tone so that it will be free from all objectionable'unmusical sounds. In other words, all of these devices are constructed with a view of making them acoustically perfect in every respect. So far as I am aware these devices fail in this respect.

My device is likewise constructed with a view of overcoming all objections as much as possible and it has for its object to provide a device of this class which is different in construction, is more novel, and is an improvement in many respects over any similar devices known to me; one that will produce a tone which is absolutely faultless due to the fact that the construction I employ renders the device acoustically perfect and removes all defects heretofore encountered. V

Otherobjects and advantages ofthe inven-jtion will be apparent during the course of the following description.

In the accompany ng drawings forming a part of this specification and in which like numerals are employed to--designate like parts throughout the same:

Figure 1 is a central vertical sectional view of a phonograph cabinet equipped with a device constructed in accordance with my invention.

Fig. on the line 2-2 of Fig. 1, looking in the direction of the arrows.

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

Fig. 4 is a front elevational view of Fig. 1. V

In carrying out my invention I employ a conduit, which I attach to the usual tone arm. This conduit is shaped and constructed Specification of Letters Eatent.

2 is a horizontal sectional view taken Patented Nov. 30, 1920.

1920. Serial no. emcee,

to approximate as nearly as possible, the human throat. Communicating with this throat and arranged at right angles to it, is a sound amplifying chamber which is designed to simulate the human mouth.

In the drawings, wherein the preferred construction of my device is shown, the numeral l designates a phonograph cabinet, which may be any conventional construction and which is equipped with a record disk 2, the speed of which is controlled by suitable governor mechanism 3. In addition to these,

have also shown a tone arm 4, and it is with this member that my device is associated. v'

My device comprises a conduit 5, and, as before stated, thisconduit is constructed and shaped to approximate the human throat as much as possible. For this reason it may well be termed a throat. This throat is connected to the tone arm 4 and depends therefrom in the manner shown, being closed at its lower end by a concave vibratory bot-' tom 6, just above which is an opening 7 The margin of this opening is irregular and at the topit is such that it forms a depending ortion 8 which I term the palate because its shape is similar to that of the human palate. A portion of the concave bottom 6 extends outwardly beyond the palate and openingland this portion may be properly termed the tongue, being designated by the numeral 9. The lower end of the throat including the palate and tongue extends through and into one of the open ends of the sound amplifying chamber 10 which is disposed at right angles to it. Examination of this chamber will disclose the fact that it is substantially oval shaped, thus its interior is of a shape 'whichapproximates that of the human mouth. Attention is directed to the fact that the throat and mouth are separated, thereby forming an air space ll between them. Provision of this air space-1] is an important factor-of the invention in that it permits air to circulate through the chamber 10 so that the sound waves may be more effectively expelled therefrom and will have greater carryingpower. It is to be noted that I also provide means for bringing about a circulation of'air. To this end, I form air openings 12 in the front of the cabinet. These openings may be of any shape. However, the ones shown are substantially S-shaped. I prefer to place these openings in close proximity to the governor. mechanism. The reason for this arrange ment resides in the'fact that when the motor is in operation, the governor will cause a small quantity of air to circulate through the openings 12, after which it will pass through the space 11 and into the chamber 10, thus insuring a proper and effective expulsion of the sound Waves, which is not usually accomplished. with this construction, the sound-waves are effectively expelled by the air circulation and the carrying power is considerably increased. Attention is also directed to the fact that the tongue 9 extends into the interior of the chamber for a dis tance so as to efiectively direct the soundwaves toward the outlet end of the chamber.

In operation the sound waves issuing from the tone arm 4 will be directed downwardly through the throat 5 and will come into contact with the concave bottom 6 thereby vibrating it and producing a very clear tone. From this point the musical sounds will be directed by the tongue 9 into the chamber 10.

At this point it is to be stated that as the sound-waves leave the throat 5 and pass through the opening 7 they are separated and equally distributed into the chamber 10 by means of the palate 8. After entering the chamber the musical tones strike the surface thereof and are deflected therefrom and pass out into the room.

The above results are accomplished by the construction employed and are insured because of the already explained air circulation which effectively expels the musical sounds.

By carefully considering the foregoing description, persons skilled in the art to which this invention appertains will be able to obtain a clear understanding of the device, therefore, further description is deemed unnecessary.

It is to be understood that the form of my invention herein shown and described is to be taken as a preferred form of the same, and that various minor changes in the shape, size, and. arrangement of parts may be resorted to without departing from the spirit sound amplifier chamber, open at its oppo site ends, the lower end of said throat carrying said opening andtongue, extending through one of the open ends of the chamber. 2. In a sound amplifier, the combination with a tone arm, of a throat connected thereto and depending therefrom, its lower end being closed by a vibratory bottom, close to and above which is an opening, the upper margin of which is irregular, thus forming a depending portion of a shape approximating the human palate, a portion of said bottom extending outwardly beyond one side of the throat thus forming a tongue which is shaped to approximate the human tongue, and a chamber of a shape corresponding to the mouth, arranged at right angles to and communicating with saidthroat.

3. The combination with a music cabinet provided with the usual tone arm and sound escape opening; of a throat connected to the tone arm and extending into said cabinet, an

open ended horn, having one end communi-- catingwith the aforesaid opening, its opposite end being closely spaced from and communicating with the open end of said throat, forming an air space between itself and the throat, means in the cabinet for creating a circulation of air, and air inlet openings in the cabinet through which air is drawn by said means, some of the air passing through the air space between the throat and horn and causing the sound waves to be effectively expelled from the latter.

In testimony whereof I have hereunto set my hand.

WILLIAM EDWARD PUGSLEY.

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