US1634380A - Sound box for gramophones and similar instruments - Google Patents

Description

July 5, 1927..

W. E. NAYLER sounn'sox FOR GRAMOPHONES AND SIMILAR INSTRUMENTS Filed Avril 18, 1923 Patented July 5, 1927.

WILLIAM EDWIN NAYLEIQ OF LONDON, ENGLAND.

SOUND BOX FOR GRAMOPHONES AND SIMILAR INSTRUMENTS.

Application filed April 18, 1923,--Serial No. 632,935, and in Great Britain April 21, 1922.

This invention relates to sound boxes for use with gramophones and similar instruments and consists cssentially in providing the emitting orifice or duct with a device adapted to enhance the propagation of the sounds and to ensure a. clearer and more perfect reproduction.

ilccording to this invention, the emitting orifice or duct pertaining to the sound boX is provided with a plurality of hollow or tubular bodies which are concentrically disposed and suspensively connected together and. to the walls of the orifice, thereby obtaining a plurality of propagating or projecting devices with the effect that the sound waves are divided up and reproduced. The said bodies are arranged the one within the other at short distances apart and from the walls of the orifice. They may be cylindri or aarallel sided or conical and the orifice correspondingly forn'ied, or the bodies and the orifice may be square in cross section, polygonal or of any other desired conformation. Each body is held within the other by a filamentous suspension cord, thread or wire the outermost body being similarly connected with or suspended from he walls of the orifice. The arrangement is such t the bodies are held in a state of s spension equidistantlyby connections which do not appreciably interfere with the.

re of the sound waves. The bodies may be. constituted by a volute spiral or lilre form of coi'istruction suspended in the orifice as above described.

By the use of such a propagating or projecting device the sound waves are divided up in such a manner that a clearer and more perfect reproduction of the record is obtained particularly with regard to vocal records.

The invention will now-be more fully de scribed with reference to the examples of projecting devices illustrated in the accompanying drawings 2- Figure 1 is an elevation of a sound box the diaphragm being broken away in the centre so as to show more clearly the sound propagating or projecting device inserted in the emitting orifice or duct.

Figure 2 is a vertical section, on the line 2 in Figure 1, showing the diaphragm fully extended across the sound emitting orifice and the sharpened edges of the latter and the suspended tubular structure in close proximity thereto.

concentrically the one Figure 2? is a fractional view similar to Figure 2 showing the edges of the bodies adjacent to the diaphragm sharpened.

Figures 3 and 4 are fragmentary views illustratin a projector formed as a volute.

Figure 5 is a View showing a square form of projector and a square orifice to the sound boX. I

Figure 6 illustrates a modification of the volute form ofpr'ojector.

Referring to Figures 1 and 2, a a a are tubular or cylindrical bodies which consiitute the projector, same being arranged 'ithin the other and within the orifice Z) of the sound box. The said orifice is of somewhat larger area than ordinarily the case and is extended towards the diaphragm c, as shown by the formation of an annular sharp or knifeedgc rim 6 on the face of the back plate or body 6 Each tubular body a is suspended. within the next surrounding body by means of threads or fine wires (Z the outermost body being similarly connected with or suspended from the walls of the orifice I in the sound boX body 6 The edges of the bodies a towards the diaphragm f are preferably sharpened as indicated at a in Fig. 2.

In this construction, the bodies are of cylindrical formation but it will be understood that they may be in the form of truncated cones similarly arranged and suspended within each other and within the sound box orifice the object being to producea dividing effect on the sound waves and enable the reproduction of the record to be rendered truly and accurately.

To the same end, the projector may assume the form of a volute as shown in Figures 3 and 4 the device, indicated by the reference a; being suspended from the walls of the orifice b by threads, fine wires or filaments cl. The convolutions pertaining to the device furnish a plurality of passages and partitions whereby the sound waves are divided up and an effect obtained similar to that resulting from the previously described arrangement.

In Figure 5, the device is shown composed of a number of square bodies a of progressive sizes arranged the one within and suspended from the other by filaments or the like d, the outermost of the series of the orifice b", The orifice is also of square formation and it will be readily apparent that the bodies as well as the orifice may be pyramidal, conical or tapering accordingto desire or requirements.

A modified form of volute a is shown in Figure 6, the convolutions being arranged in a spire so that the whole device approximates a coniform structure. The volute spiral is shown so that its base will be adjacent the diaphragm but the relative arrangement of the parts may be changed as experiment or conditions may require or dictate.

It will be understood by those familiar with the art to which the invention pertains that the body 6 of the sound box is adapted to carry the reproducing point by means of the spring or yieldingly mounted socket 6, communication with the diaphragm fbeing established through the arm 0 The diaphragm is held in the body 6 between yielding or cushion rings g 5/ of india rubher or the like by a retaining ring it which is screwed to the said body part If. The rear of the said body carries the stub or stump 2' whereby attachment to the amplifying horn or arm is effected, a cushioning washer 7r being interposed between the screwing flange i and the body or back plate 5 The ellect of a projector comprising a plurality of bodies of circular, square or other shape in transverse section and of cylindrical conical or other form in linear measurement isto divide the sound waves and to accurately convey and reproduce the same records, whether vocal, instrumental, orchestral or what not, being thereby rendered much more pleasing, precise and exact than is possible with sound boxes as heretofore constructed.

I claim 1. In a gramophone sound box having a sound emitting orifice and a diaphragm contiguous thereto, a sound propagating device comprising a plurality of sensitively suspended short thin tubes of graduated diametral measurement arranged concentricat ly the one Within the other and supported in spaced concentric relationship by suspendmg filaments of fine wire, the structure so constituted being suspended from the wall of the said sound emitting orifice by similar filaments of fine wire.

2. In a gramophone sound box having a sound emitting orifice and a diaphragm contiguous thereto, a sound propagating device comprising a plurality of sensitively suspended short thin tubes of uniform length and of graduated diamet-ral measurement arranged concentrically the one within the other and supported in spaced concentric relationship by filaments of fine wire which are disposed radially between the respective tubes and the said orifice and hold the said tubes in suspension relatively to each other and the said orifice.

3. In a gramophone sound box having a sound emitting orifice and a diaphragm contiguous thereto, a sound propagating device comprising a plurality of sensitively suspended short thin tubes of uniform length and of graduated dlametral measurement arranged in concentric parallel relation the one within the other and supported in such relationship by single filaments of fine wire which extend radially between the respective tubes and the said orifice in staggered formation and hold the said tubes in suspension relatively to each other and the saidorifice.

1-. In a gramophone sound box having a sound emitting orifice and a diaphragm contiguous thereto, a sound propagating device comprising a plurality of short thin tubes of uniform length and of graduated diametral measuren'ient, each having a sharpened edge adjacent the diaphragm and the several tubes being arranged in concentric parallel relation the one within the other and within the said orifice and supported in such relationship and within said orifice by single filaments of fine wire which extend radially in staggered formation between the respective tubes and between the said tubular structure and the wall of the orifice to hold the said tubes in suspension relatively to each other and the said orifice which latter extends in a sharpened edge in close pro-ximity to the diaphragm.

In witness whereof I have hereunto subscribed my signature.

WILLIAM EDWIN NAYLER.

Fifi

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