EP0414956A1 - Masque facial - Google Patents

Masque facial Download PDF

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Publication number
EP0414956A1
EP0414956A1 EP89116217A EP89116217A EP0414956A1 EP 0414956 A1 EP0414956 A1 EP 0414956A1 EP 89116217 A EP89116217 A EP 89116217A EP 89116217 A EP89116217 A EP 89116217A EP 0414956 A1 EP0414956 A1 EP 0414956A1
Authority
EP
European Patent Office
Prior art keywords
mask
filter
shell
face
face mask
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89116217A
Other languages
German (de)
English (en)
Inventor
Amad Tayebi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New England Thermoplastics Inc
Original Assignee
New England Thermoplastics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New England Thermoplastics Inc filed Critical New England Thermoplastics Inc
Publication of EP0414956A1 publication Critical patent/EP0414956A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask

Definitions

  • the masks are constructed of a permeable fibrous media formed to fit the contour of the face of the wearer and cover the nose and mouth.
  • Such masks function as air is inhaled through the fibrous media by the mask wearer; the flow of particulates or mists is inhibited by the fibrous filtering media, which acts to entrain the undesired particulates or mists from passing therethrough and entering into the nose or mouth of the wearer.
  • Masks of the second type, of the multiple-use variety, are those which include replaceable cartridge respiration filters are generally not directed to "throw-away" use, i.e. to be used once and subsequently disposed of.
  • Face masks of this type generally include a face piece comprising an elastomaric material which may be fitted to the face of the user and which achieves an air-tight against the wearer's face, a detachably attached cartridge for treatment of the air to be inhaled, and very frequently, a one-way exhalation valve for allowing for rapid exit of exhaled air.
  • the face pieces of such masks are stiffened either through the use of ribbing or by the inclusion of addition elastomeric material thickness, particularly about the cartridge receiving opening so that the mask remains durable, and provides an effective seal.
  • such masks are further provided with a one or two elastic straps or bands which pass about the head of the user, and which provide sufficient force so to deform the face piece of the mask by compressing it against the face of the mask wearer so to provide an effective seal.
  • the replaceable cartridge respiration filters include an impregnated agent, or an additional filter layer which may be used to absorb or entrain undesired materials, such as particular gases.
  • the instant type of mask has a substantially less amount of filter area, and the replaceable cartridge respiration filters are often generally thicker so to provide an effective equivalent of the filtration medium.
  • the present invention as defined in the appended claims is directed to face masks which cover the nose and mouth while filtering inhaled air and in particular face masks which include both a molded or thermoformed, non-porous or porous shells, and filter cartridges one or more layers of a fibrous, or other filter material which may be impregnated with a substance to remove noxious or other material including gases from the breathed air.
  • the face mask according to the instant invention may be disposable or of the multiple-use variety, and includes an outer shell whis if thermoformed of cross-linked, closed-cell foam sheet material.
  • the foam shell is impermeable to air, has good shape retention and elasticity, and yet remains soft and flexible so to provide a comfortable, yet secure seal against the face of the wearer.
  • the center area of the foam shell is perforated with a plurality of holes to permit inhaled air to pass therethrough, and a filter disposed either inside or outside of the mask so to cover said holes.
  • the mask shell is sufficiently rigid to a support a variety of filters.
  • the filters may be simple, single layer fibrous materials which might be applicable for filtering dust or other particulates, or filters consisting of a plurality of layers which layers might be impregnated with an active agent directed as the removal or neutralization of noxious or toxic gases or vapors.
  • the filter may be removably retained on the interior or exterior of the mask, by a force or friction fit, clips, or other means allowing for the removable installation of a filter.
  • the filter may be permanently bonded to the foam shell and thus produce a "disposable" embodiment of the present invention.
  • a one-way exhaust valve may be provided in the foam mask shell to provide a vent for exhaled air.
  • FIG. 1 is shown a front view of a mask 10 having a filter mounted in the interior of the mask 10.
  • the mask 10 includes an outer shell 11 through which a plurality of holes 12 are provided to provide for the passage of inhaled air from the "exterior" of the mask, i.e. the side of the mask 10 which in use, does not face the wearer and the "interior", which in use, faces the wearer's nose and mouth.
  • the outer shell 11 of the mask is fabricated from a single-layer sheeet of cross-linked, closed-cell foam which is impermeable to air.
  • Such a sheet may be of an polymeric foam material which is impermeable to the flow of gases and liquids, wherein the mass density of the foam material is less than the product of the standard mass density of water (1 kg/litre; 62,4 lb/ft3) and the specific gravity of the solid consitency of the polymer or combination of polymers from which the mask shell medium is to be made.
  • An initially permeable fibrous sheet or open cell foam sheet coated or sealed on one or both sides in order to be impermeable to the flow of gases and liquids may be defined as an impermeable foam.
  • Other materials may also be used to make the mask according to the instant invention, including combinations of laminates of polymeric sheets or films, fibrous webs, fabrics, open cell and/or closed cell foams.
  • laminates provides for the construction of a mask shell 11 which may satisfy particular color requirements, texture characteristics, "tack" characteristics (i.e. the tendency to cling to the skin of the mask wearer) on either the interior or exterior of the mask shell 11.
  • the density of the mask shell medium may be as low as 0,002 g/cm3 (4 oz/ft3), but an exemplary (though not necessary optimal) embodiment is a density of 0,065 g/cm3 (4 lb/ft3).
  • Preferable embodiments of the invention may be attained when a factor "R", defined to be the ratio of the weight of the filter media to the total weight of the mask with the filter media approaches the value of 1, thus assuring that the weight of the mask is relatively minimized when compared to the weight of the filter media to be used.
  • R a factor defined to be the ratio of the weight of the filter media to the total weight of the mask with the filter media approaches the value of 1, thus assuring that the weight of the mask is relatively minimized when compared to the weight of the filter media to be used.
  • the use of such lower density foams also provides for improved fabricability (cutting, peforating) when compared to uniform phase polymeric mateial.
  • the forming of masks according to the invention may be achieved by any suitable means, including thermoforming, injection molding, rotational molding, compression molding, blow molding, or other technique.
  • the mask 10 was constructed from a single-layer sheet of cross-linked, closed cell foam having a thickness of about 0,5 cm (3/16 inch) thick. It is preferred to provide a plurality of holes 12 with a diameter of about 1 cm (1/4 inch).
  • the mask shell 11 is futher provided with two elastic straps 13,14 of sufficient length to pass about the head of the wearer when the mask is in use, to hold the mask 10 when the rim 15 of the mask 10 is pressed against the face of the wearer. Further, a one-way valve 16 of the type well known to the art is included. The valve 16 permits the wearer to inhale through the hole 16, and exhale through the valve 16.
  • Figure 2. is a side cross-sectional view of an embodiment of a mask 10 having an external filter 18 externally attached to the front of the mask 10.
  • the external filter 18 is permanently bonded to the mask 10 by use of thermobonding, adhesives, or other fastening means.
  • the outside of the mask shell 11 may be provided with a retainer arrangement, such as later described with reference to Fig.5.
  • the mask further includes a valve 16 to facilitate the withdrawal of exhaled air, which is affixed to the lower wall of the shell 11 so as to not obstruct the wearer.
  • Figure 3 is a side cross-sectional view of a further alternative embodiment of a mask 10 which has a filter 17 mounted in the interior of the mask 10, wherein the filter 17 may be permanently affixed to the shell 11 by means as disclosed with reference to Fig.2, or by use of a snap-in retainer 19, which is to be further discussed with reference to Fig. 4.
  • a multilayer filter may include a layer of activated charcoal, and comprise any additional layers of suitable filtering material to form a composite, or filter 17 of laminar layered arrangement.
  • Figure 4. is an isometric sectional view of a snap-in plastic retainer 19 used for holding a filter 17 in the interior of the mask 10, and Figure 4a. is a cross-sectional view a detailed portion of the mask 10 shown in Fig.4 which shows a sectional view of the plastic retainer 19 in conjunction with the mask 10.
  • Retainer 19 is molded of a slightly flexible material which can be slightly bent so to be fitted into the mask 10 and yet remain its ridgidity so to provide a suitable support for the filter 17 being retained against the holes 12.
  • the retainer 19 includes an outer edge 20 which cooperatively may be retained by a groove 22 in the mask 10, so to retentitively assure the filter's 17 position and which may be readily removed to allow the insertion or replacement of the filter 17 when desired.
  • the retainer 19 may further include transverse supports 21 such as ribs, or parallel beams which lends further structural stability to the retainer 19 while not substantially impeding the flow of inhaled air.
  • FIG. 5 shows a filter retainer arrangement used with a mask 10 that has both an external filter 18 and an internal filter 17 wherein an alternative retainer assembly 23 is shown.
  • the retainer assembly 23 comprises a frame 24 which may be generally rectangular or of another shape and include a snap in retainer assembly similar to the retainer 19, and peripheral rods 25 which extend through rod holes 28 in the mask 10 and may be affixed to a second frame 26.
  • the frames 24,26 are preferably of like or similar configuration and may include transverse supports 21.
  • the dimensions of the peripheral rods 25 and the frames 24,26 are designed to assure that the external filter 18 and the internal filter 17 are retentitively retained to cover the holes 12 in the mask 10.
  • Retainer clips 29 are provided to secure the retainer assembly 23. These retainer clips 29 provided may be reusable to allow for the changing of the internal and external filters 17,18 when desired.
  • Figure 6. is a view of filter 17,18 showing different layers thereof, wherein a first layer 27 of fibrous material for filtering dust or particulates, a second layer 30 of a fibrous material impregnated with activated charcoal, and a net like third layer 31 which is to seen from the exterior side of the mask 10 which is provided for aesthetic appearances and which does not substantially inhibit air flow.
  • FIG. 7 is a cross-sectional view of a foam shell mask 10 having only one filter 18 which is replaceably mounted on the outside of the mask 10 by means of a self adhesive strip 32 wherein a mounting piece 33 on the front of the mask 10 is provided.
  • a cover strip (not illustrated) is peeled off the adhesive strip 18 which comprises part of a filter 18, and presses it onto the mounting piece 33.
  • the mounting piece may be placed on the inside of the mask, or to both the inside and outside surfaces of the mask 10, allowing for a variety of filters 17,18 to be utilized to provide selective filtering, although this embodiment is not illustrated.
  • Figure 8 is a cross-sectional view of a foam shell mask 10 according to the present invention which utilizes one or more filter cartridges 40 detachably fastened to collars 38 that mount through and are fastened to the foam shell 11.
  • a hole 37 is provided and a peripheral collar 38 is affixed.
  • the collar 38 may by of any geometry and requires only to effect an airtight seal between the shell 11 and the exterior 41 of a filter cartridge 40 so that no unfiltered air passes at this juncture 39.
  • a plurality of filter cartridges 40 might be incorporated into a mask 10 according to the invention, although only a single cartridge 40 is disclosed in Fig. 8 for ease of representation.
  • the cartridge 40 may be permanently or removably mounted in the mask 10.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
EP89116217A 1989-04-06 1989-09-01 Masque facial Withdrawn EP0414956A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1085861A JPH02268772A (ja) 1989-04-06 1989-04-06 呼吸マスク

Publications (1)

Publication Number Publication Date
EP0414956A1 true EP0414956A1 (fr) 1991-03-06

Family

ID=13870665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116217A Withdrawn EP0414956A1 (fr) 1989-04-06 1989-09-01 Masque facial

Country Status (3)

Country Link
EP (1) EP0414956A1 (fr)
JP (1) JPH02268772A (fr)
DE (1) DE8915900U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190054489A (ko) * 2017-11-13 2019-05-22 쓰리엠 이노베이티브 프로퍼티즈 캄파니 이너 쉘 및 이를 포함하는 마스크
US10835704B1 (en) 2019-05-15 2020-11-17 Applied Research Associates, Inc. Reusable respiratory protection device
IT202000006787A1 (it) * 2020-03-31 2021-10-01 Valigeria Roncato Spa Maschera riusabile con filtro sostituibile
US11583707B2 (en) 2018-07-31 2023-02-21 Milwaukee Electric Tool Corporation Respirator
US11844967B2 (en) 2018-07-31 2023-12-19 Milwaukee Electric Tool Corporation Respirator

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4496173B2 (ja) * 2006-01-20 2010-07-07 淨植 林 濾過材ボックス付きマスク
US20120017911A1 (en) * 2010-07-26 2012-01-26 3M Innovative Properties Company Filtering face-piece respirator having foam shaping layer
KR101273224B1 (ko) * 2010-11-11 2013-06-11 이영상 농약 방무 마스크
JP6846726B1 (ja) * 2020-05-23 2021-03-24 有限会社トラッド 紫外線照射によるマスク用空気殺菌装置とそれを用いたマスク及びフルフェイスマスク

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856508A (en) * 1987-04-13 1989-08-15 New England Thermoplastics, Inc. Face mask

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856508A (en) * 1987-04-13 1989-08-15 New England Thermoplastics, Inc. Face mask

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190054489A (ko) * 2017-11-13 2019-05-22 쓰리엠 이노베이티브 프로퍼티즈 캄파니 이너 쉘 및 이를 포함하는 마스크
US11583707B2 (en) 2018-07-31 2023-02-21 Milwaukee Electric Tool Corporation Respirator
US11844967B2 (en) 2018-07-31 2023-12-19 Milwaukee Electric Tool Corporation Respirator
US10835704B1 (en) 2019-05-15 2020-11-17 Applied Research Associates, Inc. Reusable respiratory protection device
IT202000006787A1 (it) * 2020-03-31 2021-10-01 Valigeria Roncato Spa Maschera riusabile con filtro sostituibile

Also Published As

Publication number Publication date
JPH02268772A (ja) 1990-11-02
DE8915900U1 (de) 1992-02-27

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