US1718354A - Loud-speaker - Google Patents

Description

June 25, 1929.

M. R. HUTCHIS ON JP! LOUD SPEAKER Fil d June 18, 1926 2 Sheets-Sheet 1 lN VENTOR ,Jr: BY

ATTORNEY J 1929. M. R. HUTCHISON, JR ,7 8,354

' LOUD SPEAKER Filed June 18, 1926 2 Shets-Sheei. 2

ENVENTOR M'llrr fl'rfgafrln'ru, J1". i

ATTORNEY onset the plates-or atented June 25 19298 UNITED sTATEs PA MILLER REESE HUTCHISQN, JE., OF LLEYVELLYN PARK,

' ASSIGNOR, BY. MESNE ASSIGNMENTS, TO ACOUSTIC PR'ZJDUGTS YORK, N. Y., A CORPORATION OF DELAWARE, v

rent easiest W'EST NEW JERSEY,

GOMPALNY, 01 NEW 1 p LGlL'D-SPEA IE3,

Application and June 18,

The present invention relates to means transmuting energy irn ulses into audible soiinds and further improvements in acoustic devices in relationto sound reproducin instruments or loud-speakers, and has for one or" its objects through a novel combination of parts and scientific principles, to produce superior results throughout the entire musical spectrum or scale,

It is also an object of my present invention toconstr ct a highly compact and comparatively inexpensive, yet hardy instrument with beauty and truth of tones and overtones, and with increased power and volume 15 or" sound throughout a wide range of fre quencies.

With the above objects and certain other objects also in view which will become apparent as the present description proceeds, and

20 the drawings are studied, my invention consists in the novel parts and "combination of parts, all ashereinafter will be more fully described and particularly pointed out in the claims. r

' Referring to the accompanying drawings forming a part ofthis specification in which like numerals designate like parts in all the views: r

Figure 1 isia diagrammatic face view of discs which form. a part of my air confining structure.

Figure 2 is a side view inelevation of two of these plates or discs assembled with a spacing between, shown in a horizontal position.

Figure 3 is a side view in. section of two .of these plates or discs assembled with a spacing between, shown in vertical position and associated with a telephone receiver sys- 0 teni partially in section and partially in elevation. The full diameters of the plates or discs are not shown, the peripheries being cut away in the view-by broken lines.

Figure l is a side view of two of these plates or discs with a spacing between, shown in vertical position in elevation, and associated with a pair of telephone receiver sys- I tems indicated in elevation. The full diameters of the plates or discs are not shown, the peripheries-being cut away in the view by broken lines. ,1 With further reference to Fi ure 1, 10,vis I a plate or disc of metal or other suitable material, wood, hard rubber, bakelite or other by suitable dies to form mutually embracing or nesting fiat horns It may now be seen that these partitioning members 12, 12, 12, 12., etc. shown curved in the present view, confine air volumes when they are associated with a pair of spaced plates or discs, and these confined'air volumes increase systematically in length from the central or common opening 11 to the out er periphery. lVhereas in the present view I have shown these partitioning members curved according to one mathematical development it-is evident that I may select other curves, or-even straight lines for the partitioning members. For best results I so find that curved partitioning members give longer horns of progressive lengths and consequently longer columns of confined air of progressive lengths for resonance.

From a study of this design it is apparent 55' that my present new structure provides a series of exceedingly compactly associated horns of various lengths, from very short ones to comparatively Verylong ones, and therefore it secure very widely diii'ering resonance char cteristics'.

To be speciiic'in the identification of some of my curved horns 13 14, and 15, are the small ends of three of them mutually terminating within-the common eccentric center of 05 sound propagation 11, and the respective large ends or" the horns terminating at the neriphery of the plates or discs 1314 and 15 and enclosing the curved air columns 16, 17 and 18, j 1

By tracing the passageway from the-common opening 11 of the resonating horns 13-13 and 1l1 i and 1515 it will be ap preciated' what long columns of resonating air are secured andhow compactly I am an abled to-nest them, and" how cheaply I may construct them. With-further reference to Figure 2, 10, 10,

' disc 10, engages the threaded member are the discs or plates, 11, is the eccentrical ly positioned opening as indicated by the dotted. lines 19, and 20, and 12, 12, 12, 12,

are the partitioning members.

With further refe'rence'to Figure 3, 10, 10, are the discs or plates, 12, 12, 12, 12, are

hand side of the figure when only one sound emitting device is employed, and a threaded boss 22, attached to or integral with the of the telephone casing 24,.containing the pole piece 25, the insulated wire 26, terminating in the connection ends 27 and 28. A diaphragm 30 is held in position in a customary and standard manner in front of the pole piece 25, and in communication with the open throatway 31, which leads to the eccentric opening, or center of sound propagation 11.

I have shown a simplified, diagrammatic telephone receiver here in the interests of clearness, but I wish it to be clearly understood that I would use a standard design of telephone receiver here with customary hardened steel permanent magnets, soft iron pole pieces, many turns of fine insulated wire upon said pole pieces, a rim washer on one or both sides of the diap ragm, and

' such other features common to telephone receiver practice as are essential to high efficiency operation when associated with radio.

reception systems.

I With further reference to Figure 4, where I have shown duplex opposed co-operating telephonereceivers in elevation, 10, 10, are the plates or discs providing the side members of my air confining structure, 12, 12,

12, 12, are the end edges of the partitioning members, either attached or integral with the members 10, 10;. and 22, is the boss of the telephone receiver on the left hand side of the drawing; 23, is the covering member of the casing 24, and 27 and 28 are the connecting wires leading into the casing and a continuation of the winding of the instrument. 11 is the position of the eccentric opening, and the center of sound wave propagation of both electro-magnetic diaphragm systems; 22' is the boss of the telephone receiver on the right hand side of the drawing; 23 is the casing member of the casing 24, and 27 and 28 are the connecting wires leading into the casing and a contlnuation of the winding of the instru ment. In practice, I may connect the wires 27, 28, and 27', 28 in series or in parallel to the source of sound transmuting electrical impulses of a radio system.

With the duplex. arrangement of electromagnetic diaphragms it is clear that I may produce an instrument of great power, since compact nest of horns of var ous reso-' nance characteristics -Diaphragms are ca- ,pable of highly complex vibration, and in my present structure I'provide a series of horns of a plurality of characteristics, in an economic position for selective resonance. To place the matter more technically, I offer a series of air columns with progressive resonance' characteristics, to the action of a diaphragm or diaphragms in highly .efiicicnt combination.

Although I have not shown a" sound reflector for backing up the instrument described, I may of course use-one, or I may place such an instrument as described in a cabinet with sound reflecting surfaces and thereby enhance the effects produced. Whereas I have shown the instrument in vertical position, there are conditions under which I may prefer to operate the instrument in a horizontal position. VVhereas' I have shown my fiat horns of progressing length closely nested through our design of construction, I may resort to the construction of a multiplicity of separate units adapted to closely nest and form thereby the sounding element of'my loud speaker. Whereas I have illustrated and described telephone receivers "as my sound emitting devices, I do not confine my: self to such systems, as I may use a musical arc, or a speaking are as sound emitting devices, or any other suitable sound emitting contrivance.

Having described my invention, I claim 1. A loud speaker of multiple resonancecharacteristics comprising a pair of spaced plates one having an opening near the center, a plurality of walls connecting said plates, said w'alls being curved in length and extending between the edge of said hole and the edges of said plates, said walls being of different lengths to provide a plurality of externally related air columns of different lengths, and an electromagnetic diaphragm device connected to said opening.

2. A loud speaker of multiple resonance characteristics comprising a pair of spaced circularplates each having an opening off center, a plurality of walls connecting said plates, said walls being spirally curved in length and extending between the edges of v said holes and the edges of said plates, said walls being of different lengths to provide a plurality of externally related curved and nested air columns of different lengths, and

sound emitting devices connected to saidholes.

8. Acoustic apparatus comprising a-pair of spaced plates, a plurality of walls connecting said plates said walls being curved of spaced plates,

in length to provide a related air columns, dev ce 1n operative HIDIIS.

4. Acoustic apparatus having multiple resonance characteristics comprising a pair a. pluralit' of walls connecting said plates, said wa ls bein curved in length and extending between the inner portion of said plates and the outer edges thereof, said-walls being of different lengths "to provide a plurality air columns of difi'erent lengths, and an energy transfer device associated with the inner ends of said air columns.

5. Acoustic apparatus 5 having multiple of externally related resonance characteristics comprising a pair of spaced plates, a plurality of walls connecting said plates, said Walls being spirally curved in length and extending inner portion of said plates and the outer edges thereof, said walls being of different lengths to provide a lurality of externally J .related air columns 0% different lengths, and

a common energy transfer device connected to said air columns at-the inner portion of said plates.

Signed at East. Orange, Essex and State of New Jersey, this 7th day of June, AL D. 1926.

' MILLERREESE HUTOHISON, JR.

between the in the county of

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