US1718351A - Sound-reproducing apparatus - Google Patents

Description

i to preserve clarity and volume of sound re- Patented June 25, 1929.

UNITED STATES, PATENT OFF MORRIS M. GRU BER, OF NEW YORK, N. Y.,.ASSIGNOE TO SONORA.

' COMPANY, INC., A CORPORATION OF NEW YORK.

ICE.

SOUND-REPBODUCING APPARATUS.

Application filed Kay 4, 1925. Serial No. 27,714.

The recent rapid development of high The invention will first be described in powered sending and receiving apparatus connection with the accompanying drawings, for lathe-telephony has necessitated quite illustrating one embodiment of the invenradical changes in the form of the receiver several views, and then more increased flux in the magnet system so as specifically defined and indicated in the appended claims. cept-ion. It is to accomplish these results In the drawings illustrating this inventhat my present invention was designed, and tion one of the objects of this invention is to Fig. 1 is a longitudinal sectional view. provide an improved, simple and effective Fig. 2 is a View taken on the line 22 means for magnifying the vibration of a Fig. 1 diaphragm within an appropriate sound Fig. 3 is a view taken on the line chamber under proper acoustic conditions to" Fig. 1 with the horn support and cover plate mechanically and electrically reproduce removed. speech or soundwaves electrically conveyed Fig. 4 is a "iew looking at the pole ends to the instrument, delivered in a magnified of the magnet taken on the line 4-4 Fig. 1. or amplified volume. Fig. is apartial sectional View taken on This invention relates to sound reproduc the line 55 Fig. 4. ing instruments and more particularly to Fig 6 is a plan view of the cover for the the telephonic receiving type used for an-' operatin parts, and Fig. 7 is a plan view D nouncmg' and commonly known asna. loud of the lower half of the ,magnet with the speaking receiver.

armature and coil in place. One of the objects of this invention is to As' shown in the drawings 1 is a ring of provide a new and improveddevice of this T section into one face of which is fitted type of few and simple parts,

ri id; nd the cover plate 2, and in the opposite face is compact construction, and improved oper fitted the circular spider'plate 3. The cover ation. plate 2 and the circular spider plate 3 are Another object of my invention is to proheld firmly in place in the ring 1- by means vide a telephonic receiver having a-permaf the screws 4. Securely fastened to the nent magnet, each pole of' which is so machined to form two poles of like polarity havinga coil located between them to promanent magnet 6 and 7 respectively. Loduce the opposite effect in the poles on both eated in- U shaped slots machined in the pole sides ofthe armature causing it to actuate ends of the upper and lower halves of the a diaphragm. In other words the magnetic magnet 6 and 7 is-the coil 8 comprising the effect first pulls the armature in one direction and due to the coil the magnetic forces are reversed and the armature is pulled back again.

lVith these and other objects in view, to

are the upper and lower halves of the per- The coil 8 is prevented from moving endwise by the lugs 11 located on the outer faces of the side flanges of the spool 10.

Flexibly mounted inthe core of the spool be more fullyset forth hereinafter, the in- 10, and centrally located is the armature 12 scribed in the following specification and vention consists in the novel construction, to the inner end of which is securely fascombin'ation of elements, and arrangement tened the connecting link 13 which passes of parts which will be exemplified in the 'through the hole 14 in the lower half 7 of operation and construction hereinafter de the magnet, and the hole 15 centrally located in the circular spider plate 3 for that purillustrated in the accompanying drawings, pose. (See F ig.' 5.) The diaphragm 16 is considered together or separately. firmly fastened to the connecting link 13 by The inventive idea involved is capable of means of the shouldered portion thereof and receiving a variety of mechanical expresthe screw-17. The periphery of the diasions, some of which, for the purposes of ilphragm 16 is firmly held against lateral lustration, are shown in the accompanying movement by the tubular rubber rings 18 drawings. which are compressed against it by the cover tion, wherein similar reference characters and the methods for the proper ad ustment are used to designate corresponding parts of the parts in order to take care of the throughout the circular spider plate 3 by means of the screw PHWONOGRAPH line wire 9 tightly wound upon the spool 10.

. nuts 22. The line leads 23 leading from receiving circuit. not shown are connected plate 2 and the circular spider .plate 3. (See Fig. 1.)

The coil 8 is connected to the binding posts 19 located in two of the arms of the circular spider plate 3, by the'le'ads 20 attached to the binding post Connections 21 which are held, in position by' the cheplk t e to suitable binding post connections 24; which are held in position on the binding posts 19 by the lockwashers 25 and check units 26. The binding posts 19 are insulated from the circular spider plate 3 by of said cover guides for centrally -the diaphragm 16 vibrates.

means of the conical insulating plugs 27 and the insulating plates 28 which also insulate the binding post connections 21 from said circular spiderplate 3. (Seelfig. 1. "he insulating plates 28 are of such shape and size to allow 'for their being used as locating the magnet. as is most clearly shown in Figures 2 and 4.

The metal cover 29, enclosing the operating parts'is fastenedto the circular spider plate 3 bythe screws 30. In the side wall is an opening or hole '31 through which pass the line leads 23 (Figures 1, 2 and 5). The top of the cover 2%) has a series of holes 32 punched therein, which may be arranged in a circle as shown in Fig.6, which are covered by a very fine wire mesh 33, held in position by the wire ring 34 which is soldered in position. The purpose ofthese holes 32 is toallow air to pass in or out of chamber formed by the cover 29 and the circular spider plate 3 when The purpose of prevent particles the chamber the fine wire mesh 33 is to of dirt or dust from entering which in time would be a great hinderance. -to the operation of the receiver.

The cover-plate 2 has integral therewith and centrally located,

the slotted collar 35 for the reception of a horn, an ear tube or the like not shown in the drawings, and

held securely therein by the binding screw In accordance with the provisions of the patent statutes, 1 have described the principle of my invention together with the apparatus which I now. consider to represent a practicalembodiment thereof, but/I desire it understood that my invention is not confined to the particular form of apparatus herein shown and described,'the same being merely illustrative, and that the invention can be carried out departing from the spirit of my invention,

employ in other ways Without' and, therefore,I claim broadly the right to all equivalent instrumentalities coming within the scope of the appended claims, and by means of which objects of my inventionare attained, and the new results accomplished, as herein set forth, as it is obvious that the particular embodiment herein shown and described is only one of many that can be employedto attain these objects and accomplish these results.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In adevice of the character described, a receiver of thetelephone type, a coil, a permanent magnet comprising two halves and embracing said coil between its poles, a flexible armature positionedwithin the core of said coil, a diaphragm, and a link, passing through one of thehalves of said permanent magnet to connect said armature to said diaphragm. V

2. In a device of the character described, a receiver of the telephone type, a coil, a permanent magnet comprising two halves heldin position by one screw and embracing said coil between their poles, an armature flexibly mounted in the core of said coil," a diaphragm, and a link, passing through one of the halves of said permanent magnet, to connect said armature to said diaphragm.

3. In a device ofthe character described, a receiver of the telephone type, a coil. a permanent magnet having its poles slotted j to embrace said coil, an armature flexibly mounted in the core and extending beyond the sides of said coil, a connecting link rigidly fastened to one end of the armature and passing. through one leg of said magnet, and adiaphragm rigidly connected to the other end of said connecting link.

at. A permanent magnet for telephone re:

ce vers comprising a pair of substantially sponding recesses of the other, forming a.

U-shaped magnet with a coil chamber adja'cent its poles. i

This specification signed this 29 day of April, 1925.

MORRIS- GRUBER.

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