US1757386A - Dynamic loud-speaker - Google Patents

Description

May 6, 1930. PREATOR ET AL DYNAMIC Ldun SPEAKER Filed Mar ch 2, 1929 fiP/eevqrae, 37 4/ 0.165554 Patented May 6, 1930 U l T E D S T A T E S PATENT OFFICE FREDERICK FBEA'I'OB AND DON R. SEELY, F SALT LAKE CITY, UTAH, ASSIGNOBS TO THE UTAH RADIO PRODUCTS GDMPANY, OF SALT LAKE CITY, UTAH, A. GORGEO- DYNAMIC noun-srnannn Application filed larch e, 1929. Serial No. 348,942.

This invenfion relates to a dynamic loud speaker, and its principal objects are: First. To prevent the breaking of the moving coil leads.

Second. To make savings in the cost of constructing and assembling.

Third. To add materially to the life of the delicate working parts of the speaker mechanism.

Fourth. To preserve the structural integrity of the vibratory system, no matter what the climatic conditions may be.

Under even date herewith, that is to say March 2, 1929, Serial No. 343,941, a separate wand co-pending application for patent entitled Method of assembling vibratory systems was filed. In the said separate application a method of assembling the vibratory system of the present invention is described.

2 and claimed. In loud speakers of the dynamic type, the moving or so-called Fvoice coil is usually made oi fiber or similar material rigidly held in a resilient spider, so that the coil may be vibrated relatively tothe pole pieces, whereby sound impulses are imparted to the conical d1aphragm, the smaller end of which is attached to the coil mounting.

Usually, the spider is made in one piece 39 and is composed of a circular hub surrounded by an elongated rim, the hub and rim being spaced annularly apart from each other, but connected by substantially radial arms. I

The extremities-of the spider along the line of its elongation, are remote from the arms, and are rigidly held ina stationary part of the speaker structure. This results in allowing the hub and the central portion of therimto vibrate freely, but makes it necessary I for the leads by which electric current is con- I ducted to the coils, to bridge a gap between the moving part of the spider and a stationary part of the speaker structure. Hence, the leads are subjected to incessant movement when the coil is vibrating, thus causing the metalin the leads to crystallize and break after a comparatively short time. This, of course, stops the functioning of the entire mechanism, and makes it a visable to send rical sections or semi-spiders. These semispiders we insulate, and make parts of the electrical circuit by means of which the coil is energized. Each semi-spider necessarily has a semi-hub and a semi-rim.

The circuit is formed by attaching the two leads from the coil to the two semi-hub portions, and the two input lines to the two semirim portions. By this means, current is conducted between the stationary parts of the semi-spiders and the movable parts thereof, through the spider structure itself, while the fine wires of the input lines terminate at the stationary parts of the semi-spiders and are not subjected to any objectionable motion whatsoever.

Essentially, the semi-spiders serve as supporting and spacing members for the moving coil and its mounting.

The features of this invention, for which the protection of Letters Patent ofthe United States is desired, are collectively grouped in the claims concluding this specification.

' In the drawing, which illustrates merely one embodiment of this invention,

Fig. l-repre'sents a longitudinal center section taken on line 1-1, Fig. 2, part of the cone diaphragm being broken away;

Fig. 2, an elevation in the direction of arrow 2, Fig. 1, parts in the foreground to the left of line 2-2, Fig. 1, being omitted;

Fig. 3, a section on line 3-3, Fig. 2;

Fig. 4, an enlargement of the central portion of Fig. 1, showing most of the parts in elevation instead of in section;

Fig. 5, a detail of substantial? the portlon enclosed by the broken line 5 in ig. 1, drawn to tweak considerably enlarged;

Fig. 6, a view in erspective showing a detail of the semi-hu broken away from the semi-spiders; and v i pole piece or core (not shown). Upon the opposite face of the annular pole piece may be secured the mounting ring 24, this being held by the screws 25 passing through the annular pole piece.

Carried by the mounting ring 24 and insulated therefrom by the fiber washers 26, is a spider composed of the two preferably symmetrical but, opposite sections, or substantially semi-spiders 27 and 27-1, these being separated from each other by cutting out a narrow strip from the original spider stamping to define gaps 28 and 29.

Each spider section is composed of. the semi-rim 30, the arm 31 and the semi-hub 32 which may carry the laterally projecting semi-flange 34. The spider is mounted on the cylindrical paper sleeve 35 so that the semi-flanges 34 shall rest upon and be concentric with the sleeve 35. The spider may be rigidly secured to the sleeve 35 by means of the wrapped layers of paper 36 and 37, Fig. 5. At 38 there may be a soft paper washer interposed between the edges of the layers 36 and 37 and semi-hubs 32, as a cushion. Spaced apart from the spider and wound on the sleeve 35 is the coil 39, this being held in place by paper wrappings 40 and 41'.

The ends of the spider areclamped in place on the mounting by means of the screws 42 bearing down on the fiber washers 43. The screws 42 are insulated from the spider, by the fiber sleeves 45.

Leads 46 and 47, from the coil, may beattached to the corresponding semi-hubs by drops of solder 48. The spider semi-rims, at one of their stationary extremities, for instance 301, may have the lugs49, to which are attached the respective input terminals 51 and 52 by means of drops of solder 53.

The usual cone diaphragm 56, having an inwardly projecting hub 57, may be secured upon the paper wrappings 37 the outer rim of the cone (not shown) being mounted in the usual manner.

In order to afford greater security in attaching the spider semi-hubs to the sleeve 35, these may be made in the form shown in Fig. 7, where the semi-hubs 32-1 have, instead of a continuous flange, what may be called a broken flange, this having portions cut out so as to have lugs 58 spaced apart from one another. The recesses retain a certain amount of glue or cement, which when dry, forms interlocking masses cooperating with the lugs 58, to hold the hubs in place u on the sleeve 35 and within the wrappings 3 While a specific embodiment of this invention is herein shown and described,'it is to be clearly understood that we reserve to ourselves the right to make such differences and variations in the construction and arrangement of the details of our device as may be suggested and demanded by the development and progress of the art or arts with which this invention is most closely identified. It is implied that such cliiierences and variations however, shall come within the scope of the accompanying claims.

Having fully described our invention what we claim is:

1. A dynamic loud speaker comprising a pole piece, a spider composed of two electroconductive sections spaced apart longitudinally and insulated from each other, and spaced apart and insulated from said pole piece, a voice coil mountin secured in said. spider, a volce 0011 earned y sald voice-coil mounting, one lead from the voice coil connected to one of said spider sections, the other lead of said voice coilattached to the other spider section, and input leads connected to the respective spider sections.

2. A dynamic loud speaker comprising a vibrator y spider, said spider composed of two electro-conductive parts spaced apart from each other, a coil carried by said spider, one terminal of said coil attached to one of said spider parts, the other terminal ofthe said coil attached to the other part of said spider parts, and electric'input leads attached to the two respective spider principal parts.

3. A. vibratory system comprising a spider composed of semi-hubs spaced apart from each other and semi-rims spaced apart from each other and from said semi-hubs, a vibrating member supported in said semi-hubs, and a support for said semi-rims.

4. A vibratory system comprising two' semi-spiders spaced apart from each other longitudinally, said semi-spiders having hub portions, flan e portions projecting laterally from said hu -portions, a cylindrical vibratory member positioned in said hub portions, and wrappings of sheet material extendin around said vibratory member and aroun said flange portions.

5. A dynamic loud speaker comprising a vibratory s ider, said spider composed of two electro-conductive parts spaced apart from each other, a coil mounting and coil supported by said spider one terminal of said coil attached to one of said spider parts, the other terminal of the said coil attached to the other of said spider parts, electrical input leads attached respectively to the said spider parts, a cushioning member adjacent said spider, and a diaphragm member havin a hub portion positioned against said on ioning member. a

6. A vibratory system comprising two semi-spiders spaced apart from each other posed between the edges of said layers and the said hub portions, and a diaphragm member seated around said layers and against said Washer.

7. In a vibratory system, a spider composed of electro-conductive semi-spiders spaced apart from each other, each semi-spider comprising a semi-hub and a semi-rim spaced apart from said semi-hub.

8. In a vibratory system, a spider composed of electro-conductive semi-spiders I spaced apart from each other, each semi-spider comprising a semi-hub, a semi-rim spaced apart from said semi-hub, and a substantially cylindrical semi-flange extending laterally from said'semi-hub.

9. In a vibratory system, a spider composed of electro-conductive semi-spiders spaced apart from each other, each semi-spider comprising a semi-hub, a semi-rim spaced apart from said semi-hub, and a substantially cylindrical semi-flange extending laterally from said semi-hub, said semi-flange composed of a plurality of component sections spaced apart from one another.

10. In a vibratory system, a vibratory spider composed of a hub portion, a rin portion spaced apart therefrom, and a su stantially cylindrical flange extending laterally from said hub, said flange consisting of a pluralit of elemental sections spaced apart circum erentially from one'another. .p

In testimony whereof We sign our names hereto. FREDERICK PREATOR.

DON R. SEELY.

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