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Publication numberUSRE23724 E
Publication typeGrant
Publication dateOct 13, 1953
Filing dateJun 29, 1944
Publication numberUS RE23724 E, US RE23724E, US-E-RE23724, USRE23724 E, USRE23724E
InventorsJohn D. Seabert
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Immersible electrodynamic loud
US RE23724 E
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 13, 1953 J. D. SEABERT Re 23,724

IMMERSIBLE ELECTRODYNAMIC LOUD-SPEAKER Original Filed Jurie 29, 1944 Suvelxtor JUHN D.' EEHEIERT Reissued Oct. 13, 1953 UNITED STATES PATENT IMMEasILI: ELEo'rRonYN-AMIG LOUD- AKER John D. Seabert, Haddon Heights, Ni J., assigner to Radio Corporation of America, a corpora- SPE tion of Delaware Original No. 2,517,138, dated August 1, 1950, Se-

rial No. 542,745, .Tulle 29, 1944.

Application for reissue July: 28, 1951, Serial No. 239,125

12 ClaimsA Matter enclosed in heavy brackets l' appears in the original patent but forms no part` of this reissue specification; matter printed in italics indicates the additions made by reissue.

'I'his invention relates to signal translating apparatus, and more particularly to a loud-- speaker especially suitable for use as part of an announce system or the like on submarines.

It has been found very expedient in naval craft to use telephone systems or the like for communication between various parts of ships, for issuing orders, making announcements, etc. On submarines, it has been found desirable to employ announce systems utilizing loudspeakers which are mounted on the bridge. Due to the fact that submarines must often submergeV quickly, conventional loudspeakers are entirely unsuited for such operation.

The primary object of my present invention is to provide a novel loudspeaker which is especally useful on the bridges of submarines.

More particularly, it is an object of my present invention to provide an improved loudspeaker which can be` used in air and which can be submerged in water Without requiring any alteration or protective devices before submersion.

Another object of my presentinvention is to provide an improved loudspeakery as aforesaid which is capable of withstanding Water pressure of the order of 200 pounds per square inch.

Still another object of my present invention is to provide an improved loudspeaker as aforesaid which is instantly ready for operation when brought out of the waterl into the air.

It is also an object of my present invention to provide an improved loudspeaker as aforesaid whichis fairly simple in construction, quite economical in cost, and highly efficient in use..

In accordance with the present invention, I provide a water-tight casing which may comprise a pot and a removable cover therefor adapted to be arranged in water-tight relation With the pot. Within the pot is housed an electromechanical motor. This motor is preferably of the electrodynamic type and includes a field structure arranged entirelyv within the pot of the casing. A voice coil assembly is vibratively mounted on the inner surface of the cover and is connected by means of a coupling rod which passes through an opening in the cover to a sound radiating diaphragm which is vibratively carried by the cover on the outside thereof. The diaphragm, which. is made of waterproof material, is exposed on both sides thereof to the ambient and may be protected from injury by a suitable, perforated casing. A flexible seal surrounds the. coupling rod in huid-tight relation therewith and covers the aforementioned opening so as to prevent water from entering into the casing when the loudspeaker is submerged in water.

The diaphragm and the voice coil assembly operate in unison. in response to actuating sig,- nal forces applied to the voice coil assembly by the electromechanical motor, the coupling rod driving the diaphragm in response to movement of the voice coil assembly. Thus, the diaphragm can be made to radiate sound when operating in the air. When the submarine is submerged, the water surrounds the diaphragm and, since it is exposed on both. sides to the water, the Water pressure is equalized against both surfaces thereof. At the same time, the water presses against the aforementioned seal around the drivingr rod and forces it against the opening in the cover through which the drive rody passes. In this way, water is prevented from entering the casing and injuring the parts housed therein. Cable conncctions` from the voice coil, field coil, transformers, and other parts of the loudspeaker mechanism within the ycasing may be brought out from the. casing through suitable, watertight couplings.

The novel features that I consider characteristie of my invention are set forth with. particularity in the appended claims. The invention itself, however, both as to its organization and method of operation, as Well as additional objects and advantages thereof, will best be understood from the following description of one embodiment thereof when` read in connection with the accompanying drawing, in which Figure 1- is a side view, partly in section, of one form. of loudspeaker constructed according to my present invention, and

Figure 2 is a top, plan view thereof.

Referring more particularly to the drawing, wherein similar reference characters designate corresponding parts throughout, there is shown a casing comprising a box or pot I and a cover 3 hngedly connected to the pot I .and adapted to be clamped in water-tight relation therewith through' an. intervening gasket 5 by means of a plurality of bolts l. Within the pot I s housed a suitable electromechanical motor or converter 9 whichA I have shown as being` of the` dynamic type, although it may be of any other suitable type. The motor 9 includes a field structure II provided with an air gap I3.

Vibratively mounted on the inside of the cover 3 is a voice coil assembly comprising a small diaphragm or vibratory member I5 having a voice coil` I1V located in the air gap I3 in known man- A second diaphragm or vibratory member I9 is vibratively mounted between a pair of clamping members 2| and 22 and is connected to the diaphragm I by a coupling rod 23 which passes through an opening 25 in the coverll. The assembly comprising the clamping members 2| and 22 and the diaphragm I9 iscarried on the cover 3 and may be connected thereto by a plurality of bolts or the like 2l. A flexible gasket 28 of rubber or any other suitable material is clamped between the clamping member 22- and the top of the cover 3 and has an opening therein through which the coupling rod 23 extends. The gasket 29 tightly embraces the coupling rod 23 and is arranged over the cover opening 25 to prevent the passage of water, air, or other iluid between the exterior and interior of the casing I, 3. A plurality of openings 3! in the clamping member 22 and a perforated protective screen or the like 33 serve to expose both sides or surfaces of the sound radiating diaphragm I9 to the ambient, whether it be the air or the water. Connection of the loudspeaker to suitable external apparatus, such as a microphone, an amplifier, batteries and the like may be made through suitable Huid-tight couplings 35 in well known manner.

A loudspeaker such as described above may be mounted on the bridge of a submarine or in any other suitable location as a part of an announce system or the like. During operation in the air, signal forces applied to the motor 3 effect vibration of the diaphragm I5 which, in turn, drives the diaphragm i9 through the coupling rod 23 to radiate sound. The seal 29 is suiliciently iiexible to permit substantially unhampered vibration of the vibratory system. When the submarine is submerged, the water surrounds the diaphragm I9 with equal pressure on both sides thereof and it also presses the seal 29 against the cover 3. Since the casing i, 3 is fluid-tight, no water will enter therein. The diaphragm I9 is made of suitable, waterproof material, such as cloth impregnated with Bakelite or other suitable, resinous-materialJ and, since the water pressure on both sides thereof is equal, it willnot be damaged. I have found that water pressures of the order` of 20G pounds per square inch have failed to damage the diaphragm I9. Thus, no protective devices need be applied to this loudspeaker before the submarine is submerged. When the submarine rises to the surface, the loudspeaker is immediately ready for operation without requiring any adjustments or manipula tions to render it suitable for use.

Although I have shown and described but one form of my present invention, it will undoubtedly be apparent to those skilled in the art that many other forms thereof, as well as variations in the particular one described, are possible within the spirit of my invention. I therefore desire that my invention shall not be limited except insofar as is made necessary by the prior art and by the spirit of the appended claims.

I claim as my invention:

1. In signal translating apparatus, the combination of a fluid-tight casing having a hinged cover provided with an opening, an electromechanical converter including a rst vibratory member Within said casing, a second vibratory member outside of said casing, means coupling said rst and second vibratory members for movement in unison, said coupling means comprising an element passing through said opening, said hinged cover supporting said iirst and second vibratory members and containing a ilexible seal over said opening and around said element in fluid-tight relation therewith for preventing the passage of uid between the exterior and interior of said casing, the exibility of said seal permitting substantially unhampered movement of said element and said vibratory members, and limiting means carried by said hinged cover for limiting inward movement of said exible seal when said apparatus is subjected to abnormal, external fluid pressure.

2. In signal translating apparatus, the combination of a fluid-tight casing having a hinged cover provided with an opening, an electromechanical converter including a rst vibratory member within said casing, a second vibratory member outside of said casing, said hinged cover including supporting means for each of said vibratory members, said second vibratory member-supporting means having apertures therein for exposing both sides of said last named member to the ambient, means coupling said iirst and second vibratory members for movement in unison, said coupling means comprising an element passing through said opening, a fiexible seal over said opening and around said element in fluid-tight relation therewith for preventing the passage of iuid between the exterior and interior of said casing, the flexibility of said seal permitting substantially unhampered movement of said element and said members, and means for limiting inward movement of said iexible seal when said apparatus is subjected to abnormal, external fluid pressure.

3. In signal translating apparatus, the combination of a duid-tight casing having a hinged cover provided with an opening, an electromechanical converter including a rst vibratory member within said casing, a second vibratory member outside of said casingJ said hinged cover including supporting means for each of said vibratory members, a perforated auxiliary housing for said second vibratory member on said cover for exposing both sides of said last named member to the ambient, means coupling said rst and second vibratory members for movement in unison, said coupling means comprising an element passing through said opening, a ilexible seal over said opening and around said element in fluid-tight relation therewith for preventing the passage of fluid between the exterior and interior of said casing, the iiexibility of said seal permitting substantially unhampered movement of said element and said members, and means :for limiting inward movement of said iiexible seal when said apparatus is subjected to abnormal, external iiuid pressure.

4. In a loudspeaker, the combination of a duid-tight casing having a hinged cover provided with an opening therein, an electromechanical motor including a vibratory member supported within said casing by said cover, a vibratory diaphragm supported outside of said casing by said cover, means coupling said vibratory diaphragm to said vibratory member for movement in unison therewith in response to actuating forces applied to said vibratory member by said motor, said coupling means comprising an element passing through said opening, a flexible seal over said opening and around said element in uidtight relation therewith for preventing the pasysage of iluid between the exterior and interior of said casing, the flexibility of said seal permitting substantially unhampered movement of said element, and limiting means carried lby said cover for limiting inward movement of said ilexible seal when said loudspeaker is subjected to abnormal, external fluid pressure.

5. In a loudspeaker, the combination of a fluidtight casing having a hinged cover provided with an opening, an electromechanical motor including a vibratory member supported by said cover ,and disposed within said casing, a vibratory diaphragm supported by said cover and disposed on the outside of said casing, the support for said diaphragm having apertures therein for exposing both sides of said diaphragm to the ambient, means coupling said diaphragm to said vibratory member for movement in unison therewith in response to actuating forces applied to said vibratory member by said motor, said coupling means comprising an element passing through said opening, a flexible seal over said opening and around said coupling means in Huid-tight relation therewith for preventing the passage oi' uid between the exterior and interior of said casing, the iiexiblity of said seal permitting substantially unhampered movement of said coupling means, and additional means carried by said cover for limiting inward movement of said flexible seal when said loudspeaker is subjected to abnormal, external uid pressure.

6. In a loudspeaker, the combination of a uidtight casing comprising a pot and a hinged cover adapted to be brought into fluid-tight relation with said pot, an electromechanical motor mounted within said pot, said motor including a first vibratory diaphragm, a second vibratory diaphragm carried by said cover on the outside thereof, said hinged cover including a peripheral support for each of said diaphragms, said rst diaphragm being concealed Within said casing, said second diaphragm support having apertures therein for exposing both sides of said last named diaphragm to the ambient, and means coupling said diaphragms to each other for movement in unison in response to actuating forces applied to said rst diaphragm 'by said motor.

7. In a loudspeaker, the combination of a fluid-tight casing comprising a pot and a cover adapted to be brought into fluid-tight relation with said pot, an electromechanical motor of the dynamic type within said casing and including a iield structure housed within said pot, said motor also including a first diaphragm vibratively mounted on the inside of said cover, a second diaphragm vibratively mounted on the outside of said cover, a peripheral support for each of said diaphragme, said second diaphragm support having apertures therein for exposing both side of said last named diaphragm to the ambient, and means coupling said diaphragms to each other for movement in unison in response to actuating forces applied to said first diaphragm by said motor.

8. In a loudspeaker, the combination of a casing comprising a pot and a cover hingedly connected to said pot and adapted to be brought into closed, uuid-tight relation with said pot, |an electromechanical motor within said pot, said motor including a rst vibratory diaphragm concealed Within said casing when said cover is closed, a second vibratory diaphragm carried by said cover outside of said pot, a peripheral support for each of said diaphragms, said second diaphragm peripheral support having apertures therein for exposing both sides of said last named diaphragm to the ambient, and means coupling said diaphragms to each other for movement in unison in response to actuating forces applied to said rst diaphragm by said motor.

9. A loudspeaker according to claim 8 characterized in that said motor is of the dynamic type and includes a eld structure within said pot, said eld structure having anair gap, and characterized further in that said first diaphragm is also vibratively carried by said cover but on the inside thereof, said first diaphragm including an operating coil adapted to be received in said air gap when said cover is closed.

10. In signal translating apparatus, the combination of .a fluid-tight casing lhaving a cover provide-d with an opening, an electromechanical converter including a first vibratory member within said casing, a secon-d vibratory member outside of said casing, said cover including supporting means for each of said vibratory members, said second vibratory member supporting means having apertures therein for exposing both sides of said last-named member to the ambient, means coupling said vibratory members for movementin unison, said coupling means comprising an element passing through said opening, said cover containing a flexible seal over said Opening and around said element in fluid-tight relation therewith for preventing the passage of fluid between the exterior and interior of said casing, and the flexibility of said seal permitting substantially unhamperred movement vof said element and said vibratory members.

11. In signal translating apparatus, the combination of a fluid-tight casing having a cover provided with an opening, an electromechanical converter including a first vibratory member within said casing, a second vibratory member outside of said casing, said cover including supporting means for each lof said vibratory members, a perforated aumilirg housing for said second vibratory member on said cover for ea:- posing both sides `of said last named member to the ambient, means coupling said first and second vibratory members for movement in unison, said coupling means comprising an element passing through said opening, and a flexible seal over said opening and around said element in fluid-tight relation therewith for preventing the passage `of fluid between the exterior and interior of said casing.

12. In a signal translating apparatus, the combination of a fluid-tight easing comprising a pot and a cover adapted to be brought into fluidtight relation with said pot, said pot and cover excluding the ambient, an electromechanical motor mounted within said pot, said motor including a first vibratory member, a second vibratory member carried by said cover on the outside thereof, said cover including a support for said second vibratory member, said first vibratory member being concealed within said casing, and said second vibratory member support having apertures therein for exposing both sides of said last named vibratory member to the ambient, and means coupling saidvibratory members to each other for movement in unison.

JOHN D. SEABERT.

References Cited in the file of this patent or the original patent UNITED STATES PATENTS Number Name Date 352,472 Lungen Nov. 9, 1886 353,274 Tucker et al Nov. 23, 1886 1,523,964 Horig Jan. 20, 1925 2,236,973 King Apr. 1, 1941 2,276,022 Cox Mar. 10, 1942 2,346,429 Harrison Apr. 1l, 1944 2,400,281 Anderson May 14, 1946

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5473700 *Nov 24, 1993Dec 5, 1995Fenner, Jr.; Thomas C.High gain acoustic transducer