U.S. patent number 3,881,570 [Application Number 05/386,146] was granted by the patent office on 1975-05-06 for self-fitting hearing protector.
This patent grant is currently assigned to Marion Health and Safety, Inc.. Invention is credited to Frederick M. Lewis.
United States Patent |
3,881,570 |
Lewis |
May 6, 1975 |
Self-fitting hearing protector
Abstract
A self-fitting earplug has a generally elongated, ovoid- or
bullet-shaped mass of deformable putty-like polymer enclosed in an
elastomeric or resilient envelope which urges the polymeric mass
toward its original shape when deformed or elongated and inserted
in the ear canal whereby the earplug conforms to the ear canal
walls providing a close fit in the canal for attenuation of sound
and sealing of the ear opening.
Inventors: |
Lewis; Frederick M. (Burnt
Hills, NY) |
Assignee: |
Marion Health and Safety, Inc.
(Rockford, IL)
|
Family
ID: |
23524359 |
Appl.
No.: |
05/386,146 |
Filed: |
August 6, 1973 |
Current U.S.
Class: |
181/135;
128/864 |
Current CPC
Class: |
A61F
11/08 (20130101) |
Current International
Class: |
A61F
11/00 (20060101); A61F 11/08 (20060101); A61f
011/02 () |
Field of
Search: |
;128/151,152
;181/33R,23,135 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Tomsky; Stephen J.
Attorney, Agent or Firm: Wolfe, Hubbard, Leydig, Voit &
Osann, Ltd.
Claims
I claim:
1. An ear protector adapted to be inserted into the ear, said ear
protector comprising a resiliently yeildable elongated tubular
envelope of substantially circular cross-section, said envelope
being shaped generally as a bullet and tapering gradually and
unidirectionally from a large diameter base end to a smaller
diameter and rounded tip end, the base end of said envelope being
open and the tip end of said envelope being closed, said envelope
being made of a silicone polymer elastomer and being capable of
being stretched to a length at least seventy-five percent greater
than its original relaxed length and then returning to its original
relaxed length, a mass of deformable polymer material filling and
sustaining said envelope and conforming substantially to the shape
of said envelope, said mass being deformed when said envelope is
stretched in length and reduced in diameter for insertion into the
ear canal, and then tending to resume its initial shape under the
urging of said resiliently yieldable envelope as the latter returns
toward its original length and diameter and swells into substantial
conformance with the contour of the ear canal, a plug telescoped
into and bonded to the open base end of said envelope and serving
to close said base end to retain said mass within said envelope,
and a handle projecting outwardly from said plug to facilitate
insertion of the envelope into and removal of the envelope from the
ear canal.
Description
This invention relates to self-fitting earplugs or protectors. More
particularly, it relates to earplugs for hearing and other ear
protective purposes which are readily deformable for insertion into
the ear canal and which, after insertion, are self-adjusting
closely to conform to the contour or wall of the ear canal
providing a comfortably tight fit. The plug is normally provided
with a handle and can be readily removed with a gentle pull which
deforms the earplug for easy withdrawal.
Earplugs or protectors are well known and have taken a variety of
shapes and configurations. For example, there is shown in U.S. Pat.
No. 2,246,737 an ear stopper of resilient material having
projecting annular fins which deform to contact the ear canal wall
upon insertion. Shown in U.S. Pat. No. 2,446,707 is an earplug
having a resilient skin containing a spongy, resilient filler
consisting of finely ground sponge rubber.
U.S. Pat. No. 2,670,737 describes an ear protector having a hollow,
flexible envelope containing finely divided graphite. U.S. Pat. No.
3,131,241 shows an undulating latex skin containing air under
slightly superatmospheric pressure which is displaced within the
envelope. U.S. Pat. No. 2,888,921 shows a shaped air-containing
balloon-like member which can be compressed upon insertion to
supposedly conform to the ear canal contour.
While the prior art such as that described above provide protection
for the ear of varying degrees against sound and other outside
influences, there is lacking in such prior art an earplug or
protector which can be easily deformed by the user before insertion
into the ear, thus avoiding the physical forcing of the earplug
structure into the ear canal with possible subsequent damage to and
irritation of the sensitive lining or wall of the canal. At the
same time, removal of such prior art devices in many cases once
again causes scraping and subsequent irritation of the sensitive
skin or membrane in the ear canal. In the case of air-filled
earplugs, there is always the possibility of puncturing the
enclosing skin with subsequent loss of protective capacity. The
same is true of earplugs which are filled with a finely divided
material which, upon accidental rupture of the skin, might
contaminate and cause infection in the ear.
It is a principal object of the present invention to obviate the
shortcomings of prior art ear protectors.
It is a further object of the present invention to provide an
earplug which can be deformed by the user before insertion in the
ear and which, after insertion, readily adjusts itself in a
self-fitting manner to provide a comfortably tight fit between the
plug periphery and the contours of the ear canal.
Another object of the present invention is to provide an ear
protector which can be readily removed from the ear canal without
scraping or irritating the ear canal wall.
Those features of the invention which are believed to be novel are
set forth with particularity in the claims appended hereto. The
invention will, however, be better understood and further
advantages and objects thereof appreciated from a consideration of
the following description and the drawing in which
FIG. 1 shows a cross section of a typical embodiment of the ear
protector in its normal unextended condition, and
FIG. 2 is a view of the earplug in its stretched or extended
condition for ready insertion into the ear canal.
Briefly, according to the present invention there is provided an
earplug having an elongated, ovoid- or bullet-shaped skin or
envelope of an elastomeric or resilient material which is filled
with a putty-like polymer or plastic, the earplug being capable of
being elongated or reduced in cross section for ready insertion
into the ear, the elastomeric skin after positioning of the plug
within the ear canal tending to urge the putty-like polymer filler
to return to its original ovoid shape, thus conforming to the
contour of the ear canal, the contact of the skin with the ear
canal wall blocking out foreign material and serving along with the
putty-like polymeric mass to attenuate or deaden sound waves
impinging upon the ear. A handle can be attached as desired for
ready insertion and withdrawal of the ear protector.
Any of a number of materials can be used in making the present
earplugs. For example, the skin or envelope containing the
putty-like polymeric mass can be made of natural rubber or latex or
any of a number of synthetic elastomers including but not limited
to elastomers of polyisoprene, silicone, polybutadiene, ethylene
propylene copolymer, butyl rubber, polysulfide, acrylates, and the
like, the primary consideration being that it should not as used
irritate the skin or lining of the ear canal. Likewise, any of a
number of putty-like polymeric materials can be used as the filler
including so-called silicone bouncing putties and other materials
having similar characteristics. These materials should preferably
also be non-irritating to the skin.
The inserting and withdrawing handle can also be made of any of a
number of plastic materials, it preferably being made of one which
is resilient to prevent possible injury to the ear.
The elastomeric skin can be made in any of the usual manners. For
example, it can be painted onto a form of suitable shape or by
dipping a form or mold into a solution of the elastomeric material.
It is also possible to use as the mold itself the putty-like
polymer in its initial desired shape. If the skin is not formed
around the filler polymer, the plastic is inserted later into the
formed envelope and the handle inserted and fixed in place as shown
in the drawing. Referring to the drawing, there is shown in FIG. 1
a typical embodiment 1 of the present invention, the skin 2 being
of any elastomeric material which is non-irritating to the skin. In
a typical earplug, this skin can be of a polyphenylene
oxide-silicone copolymer such as that described in U.S. Pat. No.
3,696,137 and preferably such a material as described in U.S. Pat.
No. 3,668,273.
Contained within the skin or envelope 2 is the putty-like polymer
filler which can be of any of a number of materials apparent to
those skilled in the art but which, in a preferred embodiment, is a
so-called silicone bouncing putty such as that described in U.S.
Pat. No. 2,541,851 and 3,213,048, among others.
The handle 4 can be made in any form desired, a typical
configuration being that shown in FIG. 1 in which the handle has
slightly protruding rim 5, a plug-like portion 6 to fit within the
open end of the skin for adherence thereto, and, if desired, an
internal extension 7 which in cooperation with the putty-like
filler 3 provides for a more secure attachment of the handle. An
external extension 8 provides a means for grasping the handle. The
handle can be fixed to the skin with a suitable adhesive. In
appropriate cases, heat sealing or other methods of fixing the
handle can be used.
As pointed out above, FIG. 1 shows the general elongated, ovoid- or
bullet-shaped nature of the earplug before insertion into the ear.
While such a plug can be made of one median size which can fit most
ears, it will be realized that its dimensions can be changed to
provide for ear canal openings which deviate from the normal size.
By comparing FIGS. 1 and 2, it will be seen that the envelope 2 of
the plug is capable of being stretched to a length at least 75
percent greater than its original relaxed length and may return to
its original relaxed length.
Before inserting the present earplug into the ear canal, it is
stretched or elongated as by hand to a shape such as that
illustrated in FIG. 2, the amount of elongation being adjusted to
the individual ear canal to be fitted, care being taken that such
elongation is not so extended as to contact the ear drum. Upon
elongating the earplug to a cross section or diameter less than
that of the ear canal, it is inserted into the ear canal generally
to the point where the handle fits over the mouth or opening of the
canal and released. Thereupon, under the urging of the elastomeric
envelope 2, the putty-like polymeric filler 3 tends to resume its
normal shape as shown, for example, in FIG. 1. In the process of
attempting to return to its original shape, the skin 2 intimately
contacts the variations in the configuration of the ear canal
effectively sealing the canal against foreign materials and
attenuating any sound impinging upon the ear. The present earplugs
are particularly useful for sealing the ear during immersion in
water.
When the need for ear protection is ended, the earplug can be
removed by a gentle pull on the handle, the elastic skin under the
urging of the pull deforming the puttylike polymer filler to the
extent necessary for withdrawal. Upon withdrawal, the plug resumes
its original shape shown generally in FIG. 1 and after cleaning as
by washing or the usual sanitary care is ready for
re-insertion.
While in normal use lubricants are not required in the use of the
present invention, in some cases it may be desirable to coat the
skin of the earplug with a lubricant such as petroleum jelly or the
like to facilitate insertion and withdrawal.
There is provided by the present invention a self-fitting earplug
or protector which is readily and confortably inserted into the ear
canal where it provides a comfortably self-adjusting fit with the
ear canal wall and which, after the need for its use has passed, is
readily withdrawn from the ear.
* * * * *