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Publication numberUS2538339 A
Publication typeGrant
Publication dateJan 16, 1951
Filing dateSep 15, 1949
Priority dateSep 15, 1949
Publication numberUS 2538339 A, US 2538339A, US-A-2538339, US2538339 A, US2538339A
InventorsThomas Mary J
Original AssigneeThomas Mary J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Earplug
US 2538339 A
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Description  (OCR text may contain errors)

M. J. THOMAS Jan. 16, 1951 EARPLUG Filed Sept. 15, 1949 Inventor Mary 1; 7710mm Patented Jan. 16, 1951 ll) STATS PAT @T FFICE 2 Claims.

This invention relates to improvements in ear plugs, and the principal object of the invention is to protect the auditory canal against discomfort or injury resulting from the presence of water, dust, noise, etc.

This object is achieved by the provision of the instant ear plug which is adapted for insertion into the auditory canal, an important feature of the invention being the formation of the main body portion of the plug from resiliently expansible and contractible material which, by virtue of its resiliency, may be readily inserted into the canal and permitted to contract or expand therein so as to conform accurately to the configuration of the canal and eliminate any possibility of unfilled space through which water, dust, noise, etc. could penetrate.

Another feature of the invention is the flexible core in the resilient mai body portion of the plug, this core being stiffer than the body portion and lending sufficient stiffness to the plug so as to facilitate convenient and expeditious insertion thereof into the auditory canal.

With the above more important objects and features in view and such other objects and features as may become apparent as this specification proceeds, the invention consists essentially in the arrangement and construction of parts as illustrated in the accompanying drawings, in which:

Figure 1 is a fragmentary cross-sectional view of the auditory canal showing the device disposed therein;

Figure 2 is a perspective view of the device, this view being taken from the smaller end;

Figure 3 is a perspective view, similar to that shown in Figure 2, but taken from the larger end;

and

Figure 4 is a longitudinal sectional View, taken substantially in the plane of the line 44 in Figure 3.

Referring now to the accompanying drawings in detail, the invention consists of an ear plug designated generally by the reference character I0, the same embodying in its construction an elongated body ll of a shape similar to a frustum of a cone which is formed from resiliently expansible and contractible material such as sponge rubber, the larger end of this body being substantially fiat as indicated at l4, while its smaller end is provided with a rounded marginal edge 16., am best shown in Figure 4.

An elongated, substantially cylindrical core M of flexible material which is stiff relative to the material of the body i2, is embedded in the body !2, this core preferably consisting of hard rubber and extending from the large end IA of the body to the inner wall 28 of a passage in the body l2, whereby the small end portion of the body is coreless and constitutes a resilient pilot head 22.

When the device is placed in use, the plug is inserted into the auditory canal 24 of the user, small end first, during which action the resilient pilot head 22, together with the outwardly tapered configuration of the body [2, will substantiall facilitate the insertion, while the relatively stiff core [3 will assure that the body I2 is not subjected to excessive lateral bending or distortion. However, once the plug is installed, the resiliently expansible and contractible nature of the soft material from which the body I2 is formed will assure that the plug completely fills every cavity or space of the auditory canal, and will thus assure adequate protection against leakage or penetration of water, noise, dust, etc. into the ear.

Having described the claimed as new is:

1. An ear plug comprising an elongated body in the shape of a frustum of a cone with uninterrupted walls from end to end and formed from resiliently expansible and contractible material, a flexible and solid core embedded in said body, said core extending axially from the larger end to a point spaced from the smaller end of the body, so that the smaller end portion of the body constitutes a coreless pilot head.

2. The combination of claim 1 and said body having a passage therein which opens through the larger end of said body, and said core being disposed in said passage and terminating at its outer end flush with the surface of said larger end.

invention, what is MARY J. THOMAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,694,952 Santi Dec. 11, 1928 2,446,707 Leight Aug. 10, 1948

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1694952 *Mar 1, 1928Dec 11, 1928Louis SantiEar plug for bathers
US2446707 *Mar 10, 1945Aug 10, 1948Charles LeightEar plug
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2804072 *Mar 29, 1955Aug 27, 1957Rose GenzerEar plugs
US3811437 *Oct 26, 1971May 21, 1974Cabot CorpEarplugs
US4579112 *May 17, 1984Apr 1, 1986Scott Robert TFoam earplug
US4609194 *May 30, 1984Sep 2, 1986Krent Edward DVibration dampening device for sporting rackets
US4776590 *Apr 23, 1986Oct 11, 1988Krent Edward DVibration dampening device for sporting rackets
US4830139 *Aug 4, 1986May 16, 1989Cirillo Evelyn JHearing aid holding means and method of using same
US4879158 *Aug 3, 1987Nov 7, 1989Nagoya Oilchemical Co., Ltd.Masking member
US4920985 *Jan 23, 1986May 1, 1990Peltor AbDevice for closing a curved duct
US5080110 *Oct 9, 1990Jan 14, 1992Weldon Patrizia MPacifier ear plugs
US5153387 *Dec 31, 1990Oct 6, 1992Syracuse UniversityLayered earplug
US5188123 *Jan 9, 1992Feb 23, 1993Cabot Safety CorporationHearing protective earplug having alternative modes of insertion
US5452731 *Oct 25, 1994Sep 26, 1995Dickman; Donald E.Disposable, hygroscopic ear plug including tear-away portion
US5573015 *Mar 28, 1995Nov 12, 1996Williams; Colin D.Extruded ear plug
US5799658 *Aug 15, 1996Sep 1, 1998Cabot Safety Intermediate CorporationHearing protective device comprising a foam and a porous component and method of manufacture thereof
US5811742 *Oct 2, 1997Sep 22, 1998Howard S. Leight And Associates, Inc.Dual earplug
US5957136 *Oct 8, 1998Sep 28, 1999Moldex-Metric, Inc.Earplug
US5988313 *Dec 11, 1997Nov 23, 1999Dalloz Safety AbEarplug
US6484726Jun 30, 2000Nov 26, 20023M Innovative Properties CompanyArticulating earplug
US6659103 *Aug 1, 2002Dec 9, 2003Bacou-Dalloz Usa Safety, Inc.Earplug with stiffener
US6695093Jan 13, 2000Feb 24, 2004Aearo CompanyEarplug
US7192544Sep 9, 2004Mar 20, 2007Howard Leight Industries, LlcEarplug with molded-in stiffener
US7727433Feb 17, 2006Jun 1, 20103M Innovative Properties CompanyHearing protective device and method of making the same
US7731487Feb 17, 2006Jun 8, 20103M Innovative Properties CompanyMold for forming a hearing protective device
US8679607Jul 12, 2012Mar 25, 20143M Innovative Properties CompanyFoamable article
US8737669Jul 28, 2011May 27, 2014Bose CorporationEarpiece passive noise attenuating
USRE29487 *Mar 12, 1976Dec 6, 1977Cabot CorporationEarplugs
DE3217690A1 *May 11, 1982Dec 30, 1982Howard S LeightOhrstoepsel
DE3929060A1 *Sep 1, 1989Mar 7, 1991Bobertag GmbhGehoerschutzstoepsel
WO2013016336A2 *Jul 24, 2012Jan 31, 2013Bose CorporationEarpiece passive noise attenuating
Classifications
U.S. Classification128/864, D24/106
International ClassificationA61F11/08, A61F11/00
Cooperative ClassificationA61F11/08
European ClassificationA61F11/08