US3730181A

US3730181A - Diaphragm ear valve

Info

Publication number: US3730181A
Application number: US00122856A
Authority: US
Inventors: J Fling
Original assignee: Sigma Engin Co
Current assignee: North Safety Products LLC; Sigma Engin Co
Priority date: 1971-03-10
Filing date: 1971-03-10
Publication date: 1973-05-01
Anticipated expiration: 1990-05-01

Abstract

A diaphragm ear valve for protection of the ear drum from the injurious percussive and repercussive overpressures of strong sound waves. The ear valve or sound transmitter comprises a flexible diaphragm means which has a sound passage aperture therethrough. The diaphragm means is stretched radially outwardly and held by two catcher plate means each having a sound passage therethrough and annular holding means to retain the outer annular diaphragm bead. The apertures affording a sound path of sinuous configuration. The ear valve is adapted to receive an ear canal fitting.

Description

United States Patent [191 Fling DIAPHRAGM EAR VALVE [75] Inventor: John J. Fling, Malibu, Calif.

[73] Assignee: Sigma Engineering Company, North Hollywood, Calif.

[22] Filed: Mar. 10, 1971 [21] Appl. No.: 122,856

Related US. Application Data [63] Continuation-impart of Ser. No. 858,600, Sept. 17,

1969, abandoned.

[52] US. Cl ..128/152 [51] Int. Cl. ..A6lt 11/02 [58] Field of Search ..128/152; 137/517,

[56] References Cited UNITED STATES PATENTS 3,084,707 4/1963 Frye ..137/512.4 X 3,335,671 8/1967 Schoenecker et al. 137/525 X 2,487,038 11/1949 Baum ..128/152 X 2,465,606 3/1949 Reynolds ..128/152 [451 May 1, 1973 FOREIGN PATENTS OR APPLICATIONS 385,082 12/1932 Great Britain 128/152 Primary Examiner-Richard A. Gaudet Assistant Examiner--G. F. Dunne Attorney-lluebner & Worrel [5 7] ABSTRACT A diaphragm ear valve for protection of the ear drum from the injurious percussive and repercussive overpressures of strong sound waves.

The ear valve or sound transmitter comprises a flexible diaphragm means which has a sound passage aperture therethrough. The diaphragm means is stretched radially outwardly and held by two catcher plate means each having a sound passage therethrough and annular holding means to retain the outer annular diaphragm bead. The apertures affording a sound path of sinuous configuration.

The ear valve is adapted to receive an ear canal fitting.

6 Claims, 10 Drawing Figures BACKGROUND OF THE INVENTION Potential ear damage is one of the problems man has been forced to endure in order to live in todays technologically advanced society. Jet planes, various manufacturing processes, and popular music are but a few of the numerous sources of loud and potentially damaging sounds which mans ears cannot constantly endure without suffering a decrease in sensitivity to high and low frequency sounds and eventual total loss of hearing.

Various attempts have been made to deal with this problem, such as attenuation devices having sliding valves, spring actuated closure means and diaphragm ear plugs. None of the prior art gives sufficient attenuation protection from high decibel sounds without sacrificing low sound level efficiency.

SUMMARY OF THE INVENTION The diaphragm ear valve of this invention is adapted to be used in conjunction with an ear canal fitting to form an assembly for insertion into the human ear canal, more particularly, the external auditory meatus of the ear.

The diaphragm ear valve operates so as to allow normal sounds, or sounds below a predetermined decibel level, to pass therethrough and into the inner ear, while at the same time preventing the passage of abnormally loud and therefore injurious sounds into the ear.

This invention is designed to attenuate ear damage from both percussive and repercussive sound wave pressure.

The invention includes a diaphragm, the material thickness of which may be varied to control the shut-off threshold, i.e., the decibel level, at which the valve will close.

The invention is designed so that an extremely sensitive diaphragm can be used thereby giving the valve a low decibel shut-off threshold.

The diaphragm of the invention may be extremely thin, and thus the valve will have a very fast speed of response to sudden decibel increases.

Further, means are provided on the diaphragm and a retaining member to radially stretch the diaphragmto facilitate the return of the diaphragm to its normal a rest position.

These and other advantages will become apparent from the following description and drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an environmental view of the diaphragm ear valve inserted into an ear canal fitting, and the entire assembly being fitted into the external auditory meatus of a human ear;

FIG. 2 is an enlarged cross-sectional view of the assembly illustrated in FIG. 1;

FIG. 3 is a cross-sectional view of the interior portion of the ear valve;

FIG. 4 is an exploded view of the portions of the ear valve shown in FIG. 3;

FIG. 5 is a cross sectional view of a modification of the interior portion of the ear valve;

FIG. 6 is an environmental view of a modification of the diaphragm ear valve inserted in an ear canal fitting, and the entire assembly being fitted into the external auditory meatus of a human ear;

FIG. 7 is an enlarged cross sectional view of the modified assembly illustrated in FIG. 6;

FIG. 8 is a cross sectional view of the modified assembly of FIG. 7 illustrating the valve closed;

FIG. 9 is a view taken on line 99 of FIG. 7; and

FIG. 10 is a modified form of the diaphragm illustrated in FIG. 9.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 there is illustrated the diaphragm ear valve of the invention, generally designated 10, shown connected to a resilient ear canal fitting generally designated 12 which is inserted into the external auditory meatus 14 of a human ear 15.

Any type of ear canal fitting 12 may be utilized to seat in the canal 14. However, it is preferred that the fitting 12 be formed with a plurality of forward annular flanges 16 which bear against the external auditory meatus 14 to form a soundproof seal therebetween and a rear annular flange 18. Rear annular flange 18 is preferably larger in diameter than forward flanges 16 and the external auditory meatus l4 and limits the insertion of fitting 12 into the ear. No claim is made regarding the novelty of the ear canal fitting, which is a type well known in the art, but necessary for correct operation of the ear valve 10.

In FIG. 2 there is illustrated the diaphragm ear valve 10 and ear fitting 12 with arrows indicating the path of normal sound wavesthrough the assembly.

The ear valve or sound transmitter 10 preferably includes a semi-circular inner bell housing 20 and semicircular outer bell housing 22. The

housings

20 and 22 are preferably formed of a relatively hard plastic. However, when the valve 10' is utilized (FIG. 6) it is adapted to be positioned in the ear canal fitting 12' and the need for the bell housing 20 is eliminated. Further, other means may be utilized to operatively associate the sound transmitter or

valve

10 or 10 with the ear fitting 12 or 12'.

Each of the

housings

20 and 22 include flat mating surfaces 24 and 26 and the housings may be secured together along said surfaces by means of an epoxy or other adhesive.

While the

housings

20 and 22 are preferably made of plastic for weight and ease of fabrication they can be manufactured of aluminum or other metal without de parting from the spirit of the invention.

The inner bell housing 20 is formed with an annular groove 28 and a recess 29. Outer bell housing 22 has similar annular groove 30 and recess 32.

An inner valve assembly means generally designated 33 and particularly illustrated in FIG. 3, includes two identical annular diaphragm retainer means or rigid catcher plates 34a and 34b and a resilient annular diaphragm means generally designated 36.

Diaphragm 36 has a sound passage aperture or centrally located hole 38, an inner annular bead 40 formed around the periphery of hole 38,. and projecting outwardly equidistant on each side of the diaphragm. Further, there is provided an outer annular head 42 around the outer periphery of the diaphragm 36.

Catcher plates 34a and 34b each have a sound passage aperture axially aligned with the other, or a plurality of

apertures

44a and 44b which are axially aligned near their outer edges. Also, plates 34a and 34b are provided with annular seats 46a and 46b around their central axes having a circumference equal to that of bead 40 on diaphragm 36. The plates 34a and 34b also include annular diaphragm retaining grooves 48a and 48b on the same sides as seats 46a and 46b. Around the peripheral edges of catcher plates 34a and 34b on the sides opposite grooves 46a and 46b and 48a and 48b are annular axially outwardly extending

flanges

50a and 50b.

The circumference of diaphragm retaining grooves 48a and 48b is slightly larger than the circumference of outer bead 42 of diaphragm 36, so as to space the diaphragm therebetween when in an at rest position or generally fattened condition, see FIG. 2.

To assemble the inner valve assembly 33, the diaphragm 36 is positioned between the plates 34a and 34b with the bead 42 seated in grooves 48a and 48b so that the diaphragm 36 will be stretched radially outwardly and tensioned therebetween.

Flange 50a of catcher plate 34a seats within groove 30 of outer bell housing 22 and flange 50b of catcher plate 34b seats within groove 28 of inner bell housing and each of the plates 34a and 34b are seated in the

respective recesses

32 and 29. In this manner the inner valve assembly 33 is retained between the two bell housing portions.

An ear fitting adapter 52 is preferably screw fitted into an enlarged threaded portion 53 of axial bore 54 of inner bell housing 20. The adapter 52 has a plurality of annular flanges 56 around its periphery which fit in corresponding annular grooves 58 in the enlarged portion 60 of the axial bore 62 of ear fitting 12.

In normal operation when the incident overpressure of sound waves does not exceed a predetermined threshold, the ear valve operates as follows when inserted into a human car as shown in FIG. 1 and previously described.

Sound waves, simulated by arrows in FIG. 2, pass through aperture 64 of outer bell housing 22 into bell chamber 66. The sound waves then pass through the several apertures 44a of catcher plate 34a, through the space defined between the catcher plate 34a and diaphragm 36, through central opening 38 of diaphragm 36, through the space defined between the catcher plate 34b and diaphragm 36, and through apertures 44b of catcher plate 3412 into bell chamber 68 of inner bell housing 20. The sound waves then pass through bore 54 and bore 62 into the ear.

However, when the incident overpressure of sound waves exceeds the predetermined threshold, the ear valve will close.

If the sound waves are percussive in nature they will pass through aperture 64 and bell chamber 66 of outer bell housing 20 and through apertures 44a of catcher plate 34a. Pressure buildup on the surface of diaphragm 36 will cause it to deflect inwardly in a catenary bowwhereby a seal is created between bead 40 and seat 46b of catcher plate 34b, as shown in FIG. 3 thereby preventing passage of the overpressure wave into the ear.

If the overpressure sound wave is repercussive a partial vacuum will be created in bell chamber 66. The pressure differential between bell chamber 66 and bell chamber 68 will cause diaphragm 36 to deflect, again in the form of a catenary bow, toward the outer catcher plate 34a whereby a seal is created between bead 40 and seat 46a of said catcher plate to prevent a damaging increase in pressure on the ear drum.

Whether the overpressure wave is percussive or repercussive the diaphragm 36 will deflect from its normally at rest position, that is, on a perpendicular plane with said valve axis and spaced equidistant from said respective catcher plates 34a and 34b, in an annularly uniform catenary bow due to the uniform tensioning of the diaphragm 36 resulting from the slight variation in circumference between diaphragm bead 42 and I diaphragm retaining grooves 48a and 48b. This tensioning and resiliency of diaphragm 36, plus its low inertia insure fast response to rapid fluctuations in the overpressure waves. Furthermore, the seating of bead 40 in seats 46a and 46b insures complete sealing between the diaphragm 36 and the catcher plates 34a and 34b, even under the stress of severe overpressure.

The valve shut-off threshold, the overpressure at which the diaphragm will deflect, can be predeterthe hole 38 of diaphragm 36 does not engage seats 46a and 46b but bears directly against the face of either plate 34a or 34b. In other words, the recessed seats are absent.

FIGS. 6 through 9 show a modification of the ear valve or sound transmitter 10 and the inner valve assembly 33'. In this particular modification, the inner valve assembly 33' is retained within the resilient ear canal fitting 12' remote from. the flange l6 and 18. Preferably, the fitting 12' includes an enclosed housing 70 which encompasses or includes an annular cavity 72. Projecting from the rear face 74 of the housing 70 is a generally solid finger gripping portion 76 to be grasped by the fingers so that the entire valve 10 may be seated in the ear such as seen in FIG. 6.

The housing 70 includes a bore 78 extending through the front wall 80 and a bore 82 in the rear wall 74 axially aligned with the bore 78. The bore 78 is turn in aligned with bore 54' of the fitting l2.

Mounted within the cavity 72 of the housing 70 are a pair of rigid retainer means or catcher plates 34a and 34b of corresponding diameters and in parallel relationship one with the other. The catcher plates 34a and 34b are adapted to be butted together as best seen in FlG. 7. Each plate 34a and 34b includes a

sound passage aperture

44a and 44b which are preferably tapered inwardly toward the diaphragm 36 so as to concentrate sound waves to the center of the diaphragm as best seen in FIG. 7. These apertures extend through each of the respective plates 34a and 34b and are in axial alignment as well as being axially aligned with the

respective bores

82 and 78. Each of the plates 34a and 34b include

inner faces

84 and 86 respectively, and in the central portion of the respective plates, annular

interior recesses

88 and 90 are formed in the plates 34a and 34b respectively, creating a central chamber 91.

Further, each of the interior faces 84 and 86 are formed with opposed annular retaining grooves 48a and 48b.

The diaphragm 36' includes an annular peripheral head 42' which is adapted to be gripped within the grooves 48a and 48b so as to maintain the diaphragm 36' in a vertical, at rest position stretching across the chamber 91. The diameter of the grooves 48a and 48b are slightly greater than the diameter of the diaphragm and bead so as to stretch the diaphragm when seated so that the position shown in FIG. 7 is achieved.

The diaphragm 36' differs from the diaphragm 36 in that the central portion 92 of the diaphragm 36' is enlarged in cross section having a thicker diameter than the normal flexible membrane portion 93 of the diaphragm 36'. Preferably, the central portion is formed with opposed concave surfaces or faces 94 and 96 which are adapted to close off the

openings

44a and 44b such as illustrated in FIG. 8 when the overpressure wave moves into the assembly W in the direction of the arrows shown in FIG. 8.

In order to allow sound waves to pass from the exterior to the ear drum, the diaphragm preferably includes a pair of diametrically opposed sound passage apertures 98, out of axial alignment with the

passages

44a and 44b so that the sound path is of sinuous configuration into the ear drum.

As can be seen, when the sound is either of an excessive percussive or repercussive nature, the diaphragm will be flexed and moved to the position such as seen in FIG. 8 or against the recess 88 in the case of repercussion, and the

concave surfaces

94 and 96 will form a complete seal around the

respective passages

44a and 44b. With the increase of pressure on the central portion 92 the concave surfaces or faces are further deformed toward a generally flat plane and greater sealing may be achieved.

In FIG. 10 there is illustrated a diaphragm 36" similar to that illustrated in FIG. 9 with the exception that there are a plurality of sound passageways 98 spaced peripherally around the diaphragm.

While the embodiment illustrated in FIGS. 6 through 9 shows the inner valve assembly 33 being integrally formed in the ear canal fitting 12 the invention is not limited to the particular configuration within the ear canal fitting 12 but can be utilized equally as well in the housing configuration of F168. 1 through 5, which would then be affixed to an ear fitting.

Although I have herein shown and described my invention in what I have conceived to be the most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of my invention.

I claim:

1. In a sonic ear protector device wherein an ear canal fitting which includes a sound passage conveys sound waves reaching the passage, the combination with said fitting of a sound transmitter coupled with said fitting, the transmitter comprising parallel enerall ri id lates s aced a art nd a dia h etween sai pla ies lock ed aroufid its periphery by 2$ plates, a sound passage aperture through each plate in axial alignment, a sound passage aperture through the diaphragm axially offset from the sound passage apertures through the plates, the diaphragm being laterally spaced from the adjacent plates when reposing in generally flattened condition and the apertures in the plates and diaphragm in conjunction with the space on each side of the diaphragm affording a transmitter sound passage of sinuous configuration in communicating relationship with the sound passage of said fitting, the diaphragm including a relatively thin flexible membrane and a central annular sealing portion of relatively thicker cross section to provide a ring seal, whereby when said diaphragm is forced against either of said plates by the overpressure of sound waves said sealing portion will bear against the plate against which it is forced and create a seal closing off said transmitter sound passage.

2. The combination as defined in claim 1 wherein said sound passage apertures through said plates are axially aligned with said central annular sealing portion of said diaphragm and the diameter of said central annular sealing portion is greater than the diameter of said apertures in said plates.

3. The combination as definedin claim 1 wherein said central annular sealing portion of said diaphragm includes opposed sealing faces of concave configuration whereby said overpressure of sound waves will distort one of said faces to close off said transmitter sound passage.

4. The combination as defined in claim 1 wherein each of said sound passage apertures through said plates taper inwardly towards said. diaphragm.

5. The combination as defined in claim 1 wherein said diaphragm includes an annular peripheral. bead and said plates include opposed retainer grooves of a diameter slightly greater than the diameter of said diaphragm and said bead whereby when said bead is seated in said grooves said diaphragm will be radially stretched.

6. The combination as defined in claim 1 wherein said central annular sealing portion includes a sound passage aperture and an annular bead around said aperture, and said plates each include an annular seat wherein when said diaphragm is flexed said bead will engage one of said seats and provide a ring seal closing off said sound path.

Claims

1. In a sonic ear protector device wherein an ear canal fitting which includes a sound passage conveys sound waves reaching the passage, the combination with said fitting of a sound transmitter coupled with said fitting, the transmitter comprising parallel generally rigid plates spaced apart and a diaphragm between said plates locked around its periphery by said plates, a sound passage aperture through each plate in axial alignment, a sound passage aperture through the diaphragm axially offset from the sound passage apertures through the plates, the diaphragm being laterally spaced from the adjacent plates when reposing in generally flattened condition and the apertures in the plates and diaphragm in conjunction with the space on each side of the diaphragm affording a transmitter sound passage of sinuous configuration in communicating relationship with the sound passage of said fitting, the diaphragm including a relatively thin flexible membrane and a central annular sealing portion of relatively thicker cross section to provide a ring seal, whereby when said diaphragm is forced against either of said plates by the overpressure of sound waves said sealing portion will bear against the plate against which it is forced and create a seal closing off said transmitter sound passage.

3. The combination as defined in claim 1 wherein said central annular sealing portion of said diaphragm includes opposed sealing faces of concave configuration whereby said overpressure of sound waves will distort one of said faces to close off said transmitter sound passage.

4. The combination as defined in claim 1 wherein each of said sound passage apertures through said plates taper inwardly towards said diaphragm.

5. The combination as defined in claim 1 wherein said diaphragm includes an annular peripheral bead and said plates include opposed retainer grooves of a diameter slightly greater than the diameter of said diaphragm and said bead whereby when said bead is seated in said grooves said diaphragm will be radially stretched.