U.S. patent number 3,730,181 [Application Number 05/122,856] was granted by the patent office on 1973-05-01 for diaphragm ear valve.
This patent grant is currently assigned to Sigma Engineering Company. Invention is credited to John J. Fling.
United States Patent |
3,730,181 |
Fling |
May 1, 1973 |
DIAPHRAGM EAR VALVE
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.
Inventors: |
Fling; John J. (Malibu,
CA) |
Assignee: |
Sigma Engineering Company
(North Hollywood, CA)
|
Family
ID: |
22405213 |
Appl.
No.: |
05/122,856 |
Filed: |
March 10, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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858600 |
Sep 17, 1969 |
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Current U.S.
Class: |
128/868 |
Current CPC
Class: |
A61F
11/08 (20130101) |
Current International
Class: |
A61F
11/00 (20060101); A61F 11/08 (20060101); A61t
011/02 () |
Field of
Search: |
;128/152
;137/517,512.4,512.5,525 ;181/23 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Dunne; G. F.
Parent Case Text
This application is a continuation-in-part of my pending U.S. Pat.
application Serial No. 858,600, filed Sept. 17, 1969 now abandoned.
Claims
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
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.
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 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.
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.
Description
BACKGROUND OF THE INVENTION
Potential ear damage is one of the problems man has been forced to
endure in order to live in today's 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 man's 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 diaphragm to facilitate the return of the
diaphragm to its normal at 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 9--9 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 14 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 waves
through the assembly.
The ear valve or sound transmitter 10 preferably includes a
semi-circular inner bell housing 20 and semi-circular 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 departing 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 bead 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 20 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 ear 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 34b 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 bow whereby 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 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 predetermined and regulated by
varying the size of diaphragm opening 38, the thickness of the
diaphragm 36, the size of apertures 44a and 44b in the catcher
plates 34a and 34b respectively, or the material from which the
diaphragm is constructed.
The disclosure of FIG. 5 is substantially the same as the inner
valve assembly means 33. However, the difference resides in the
fact that the bead 40 surrounding the 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
16' 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
12'.
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 FIG. 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 bead 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 10' 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 20 configuration of FIGS. 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.
* * * * *