[go: up one dir, main page]

EP0258508B1 - Masque respiratoire à élément de filtrage interchangeable - Google Patents

Masque respiratoire à élément de filtrage interchangeable Download PDF

Info

Publication number
EP0258508B1
EP0258508B1 EP19860306861 EP86306861A EP0258508B1 EP 0258508 B1 EP0258508 B1 EP 0258508B1 EP 19860306861 EP19860306861 EP 19860306861 EP 86306861 A EP86306861 A EP 86306861A EP 0258508 B1 EP0258508 B1 EP 0258508B1
Authority
EP
European Patent Office
Prior art keywords
valve
face piece
filter
respirator
inhalation
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.)
Expired
Application number
EP19860306861
Other languages
German (de)
English (en)
Other versions
EP0258508A1 (fr
Inventor
Edward N. Montesi
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.)
North Safety Products LLC
Original Assignee
Siebe North 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
Priority to US06/721,284 priority Critical patent/US4630604A/en
Application filed by Siebe North Inc filed Critical Siebe North Inc
Priority to EP19860306861 priority patent/EP0258508B1/fr
Priority to DE8686306861T priority patent/DE3678442D1/de
Publication of EP0258508A1 publication Critical patent/EP0258508A1/fr
Application granted granted Critical
Publication of EP0258508B1 publication Critical patent/EP0258508B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A62B18/025—Halfmasks
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
    • A41D13/1138—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration
    • A41D13/1146—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration obtained by moulding

Definitions

  • This invention relates to respirators of the type usually known as dust masks, such respirators including a filter of fibrous material for trapping and holding particulate matter in the form of dust or fume, or aerosols in the form of mist suspended in air that passes through the filter.
  • respirators are comprised of a face piece formed from stabilized textile fibers, and which has been appropriately molded or otherwise formed for it to extend over the nose and mouth of a user, and, which is held in that position by elastic straps attached to the face piece and which are passed over the user's head to resiliently hold the respirator in situ over the user's nose and mouth.
  • Such dust masks are entirely temporary and fully disposable, in that once the filtering capability of the filter has been exhausted due to clogging of the filter, the user has no option other than to discard the dust mask and replace it with another, unused mask.
  • Heat from the inhaled air raises temperature of the thick (extra thick in case of metal fume) filter fibers from exhalation. This heat is then transferred to the incoming air upon inhalation. A raise in temperature as low as 2° - 3° causes great psychological and physical discomfort to the user.
  • air Inhaled through the filter does not have to be subsequently exhalted through the filter, but Instead, is by passed through the exhalation valves.
  • Replacement filter respirators of this latter type are referred to as semi-disposable respirators, in that the cartridge incorporating the filter material can be removed from the face piece for disposal and replacement by an unused cartridge, the face piece itself and its associated inhalation and exhalation valves being a permanently retained portion of the respirator.
  • the replaceable filter element is supported by a frame, which is intentionally configured for it to be extremely light in weight, and for it to be kinetically balanced relative to the user's head, and which further is arranged to support a fully disposable filter of considerably greater filtering area than that of a conventional semi-disposable respirator.
  • the frame can be formed as an elongate member of dihedral planform that wraps around the face piece and extends to opposite sides of the user's face.
  • the exhalation valve is positioned centrally of the frame and concentric with the inhalation valve, the frame having ribs that support the filter material spaced from a back wall of the frame, and which provide channels for directing filtered air into the face piece through the inlet valve.
  • the entire weight of the assembly can be kept to a fraction of that of a conventional replaceable filter respirator, and to a weight that only slightly exceeds the weight of a conventional fully disposable respirator.
  • the contained volume of the face piece can be reduced to a mere fraction of that of a conventional semi-disposabIe respirator, thus substantiaily reducing the entrapment of stale exhalted air within the face piece.
  • the filter can be positioned in closer proximity to the user's face, thus considerably improving the field of view of the user; while at the same time further minimizing inertial effects on the user's face caused by the respirator.
  • a primary use of the respirator of the present invention is in conjunction with a welders shield, the respirator being of sufficiently minor dimensions for it to be positioned within the welders shield without in any way affecting or interfering with raising and lowering of the shield.
  • Figure 1 is a front perspective view of the removable filter respirator according to the present invention.
  • Figure 2 Is an exploded perspective view of the respirator of Figure 1;
  • FIG. 3 is a rear perspective view of the respirator of Figure 1;
  • Figure 4 is a cross-section through the respirator taken in a horizontal plane
  • Figure 5 illustrates in cross-section an alternative embodiment of the respirator incorporating a fully disposable filter sub-assembiy.
  • the replaceable filter respirator is indicated generally at 10, the respirator being comprised of a face piece 12, to which is attached a frame 14, the frame providing attachments for straps 16 employed to secure the respirator on the head of a user with the face piece surrounding the nose and mouth of the user and providing an effective continuous seal with the user's face, despite variations in the contours and configurations of the particular user's face.
  • the face piece 12 such as is well known in the art, is molded or otherwise formed from an extremely soft and pliable rubbee-like material, that can be worn on the user's face for extended periods of time without causing discomfort to the user.
  • the face piece 12 may be formed from a foamed, cloased- clell plastics material, further to minimize the already minimal weight of the face piece.
  • the frame is attached to a forward portion of the face piece 12, the face piece conveniently including buttresses 18 to stabilise the frame 14, and equalize the compressive stresses exerted on the face piece by the frame 14 at the time the frame 14 is drawn towards the user's head by the straps 16.
  • the buttresses 18 are of particular utIlity in preventing inward collapse of the face piece 12 at any particular location when under compressive loading and a concomitant discontinuity in the seal between the face of the user and the face piece due to such unequal stressing.
  • the frame 14 may be formed in any convenient manner and of any convenient material, including light-weight metal, but is preferably formed by injection molding a light-weight relatively rigid, and relatively impact resistant plastics material, such as an acrylic resin.
  • the frame 14 preferably is formed as a unitary injection molding, it can be formed with equal facility of separate members assembled to each other.
  • the frame 14 is comprised by an outer perimetral flange 20 of a generally trapezoidal form, the flange 20 being symmetrical about a central ring 22/that is rigidly interconnected with the Range 20 by ribs 24 providing air flow channels between adjacent pairs of ribs.
  • the ring 22 provides a support, or itself comprises a support for an exhalation valve 26 supported on a spider 28, and an Inhalation valve 34, as is later described.
  • the exhalation valve 26 and its supporting spider 28 can be formed as a separate sub-assembly that is a press fit within the central ring 22.
  • the rear face of the frame 14 is completely closed off by a back wall 30, either formed integrally with the frame 14 or secured to the frame 14 after the formation thereof.
  • the back wall 30 provides a central opening 32 concentric wIth the support ring 22, such that air flowing in the channels provided by the outer perimetral flange 20, the ribs 24, and the back wall will flow towards and through the central opening 32.
  • the back wall 30 provides a relatively rigid connection for the face piece 12 in surrounding relationship with the central opening 32, the central ring 22 providing a support for an annular inhalation valve 34.
  • the outer perimetral flange 20 of the frame 14 is provided with a rebate for the reception of locking tongues or ribs 38 formed on a perimetral flange 40 of a perforate filter retainer member 42, adapted to embrace and hold a replaceable filter member 44 in abutting relationship with the outer perimetral flange 20, the ribs 24, and the central ring 22 of the frame 14.
  • the filter retainer member 42 is sufficiently perforate to provide minimal impedence to air flow through the filter member 44, and includes a central annulus 46 adapted to engage the perimeter of a circular opening 48 in the filter member 44 and hold it clamped against the central ring 22.
  • the filter retainer member 42 is provided with a deflector guard 50 overlying the central annulus 46 for deflecting exhaled air downwardly away from the eyes of the user, and away from the back side of the welders shield, if used, to prevent fogging of the lens.
  • the locking tongues 38 are asymetrically positioned relative to the frame 12 and the filter retainer member 42, such that the frame 12 will only accept the filter retainer member in the correct orientation in which the deflector guard 50 has its outlet facing downwardiy.
  • the frame 14 is formed as a dihedral and considerably elongate in horizontal dimensions in order that the side portions of the frame 14, can extend towards the user's face, and to opposite sides of the face piece 12.
  • the assembly is completed by the straps 16, which are attached to the frame 14 by buckles 52, either integrally formed with the frame 14 or subsequently attached thereto in any convenient manner.
  • the face piece 12 is attached to the frame 14 by it being trapped within a groove 54 provided by the back wall 30.
  • the groove 54 is of relatively large peripheral extent, such that a considerable reduction in the weight of the face piece ensues, again resulting in minimal weight of the respirator.
  • the exhalation valve 26 Secured within the central ring 22, and positioned on the outer side of the spider 28, is the exhalation valve 26 which is of an extremely flexible but dimersionaliy stable sheet material and, which seats at its edges on a valve seat provided by the central ring 22 in the event that air is inhaled through the central ring 22, and, which will freely flex away from the spider 28 and the central ring 22 in the event that air Is exhaled through the central ring 22, thus providing an exhalation valve integral with and positioned interiorly of the central ring 22.
  • the inhalation valve 34 Exteriorly of the central ring 22, and secured thereto in any convenient manner, such as by ultra-sonic upsetting of the material of the central ring 22, is the inhalation valve 34, which also is of said extremely flexible and dimensionally stable sheet material and which extends radially from the outer circumference of the central ring 22 and into seatIng relationship with a valve seat provided by the back wall 30 of the frame 14.
  • the only route for air inhaled through the filter 44 is through the channels provided between the ribs 24, and which lead to the central opening 32.
  • the flap valve 34 Upon inhalation by the user, and a drop In pressure within the face piece, the flap valve 34 lifts at its edges, permitting ready access of the filtered air to the interior of the face piece 12 with minimal impedence, the impedence to such air flow being greatly minimized by the extremely large effective area of the filter 44, and the negligIble impedence to air flow through the central opening 22 and the inhalation vakve 34.
  • the inhalation valve 34 Upon exhalation by the user and a rise in pressure within the face piece 12, the inhalation valve 34 immediately closes, and, the exhalation valve 26 immediately opens, permitting the exhaust of exhaled air direclly to atmosphere from the interior of the face piece 12 and with an absolute minimum of impedence.
  • exhaled air can not proceed into the channels between the ribs 24 and into the filter, the channels remaining charged with pure and unadulterated air during exhalation by the user.
  • the fIlter material itself can be replaced with great facility, merely by snapping off the filter retainer member 42, removal of the used filter member 44 and discarding it, repositioning a replacement filter member 44 over the central clamping ring 22, and by then snapping on the filter retainer member 42, to hold the filter member appropriately clamped onto the frame 14, the ribs 24, and the central clamping ring 22, thus inhibiting leakage of contaminated air at the peripheral edges of the filter member 44.
  • the user will, by a virtue of movement of the user's head and which may be a relatively rapid movement, exert significant kinetic forces on the respirator. This can cause either discomfort to the user, or lifting of the edges of the face piece 12 out of sealing engagement with the user's face, thus permitting inhalation by the user of contaminated air.
  • the frame 14 is formed as a dihedral, such that all portions of the frame 14 are in as close proximity to the user's face as can be arranged. Further, by connecting the straps 16 directly to the dihedrally shaped frame 14, further resistence to movement of the frame 14 is provided, in that the straps also will resist any attempted lateral movement of the ends of the frame 14, or, any attempted rotational movement of the frame 14 about the general centrai axis of the respirator.
  • respirator described above is illustrative of a preferred embodiment of the invention and, that various modifications of that structure may be made without departing from the scope of the appended claims.
  • the ribe 24 may be increased in number, and/ may be arranged other than radial to the central clamping ring 22, provided, or course, that the rib 24 retain the unrestricted channels for airflow between' the ribs and into the central aperture 32.
  • the filter retaining member has been shown as having a generally rectangular graticule permitting air flow to the filter member 44, any other convenient configuration of perforate grid can be provided.
  • any other convenient means for attaching the filter retainer member to the frame 14 can be provided, or, for attaching the frame 14 to the face piece 12.
  • a further advantage accruing from the use of such concentric inhalation and exhalation valves is that any moisture deposited within the face piece by virtue of condensation from the exhaled air of the user will occur dominantly at the exhalation valve 56, at a position in which it readily can be evacuated from the mask by way of the deflector guard 50.
  • the concentric inhalation and exhalation valve are die cut in a single operation with the external diameter of the inner annulus identical to the inner diameter of the outer annulus , thus permitting economy in the manufacture of the valves simultaneously in a single strike of the cutting die, and with substantially zero wastage of materIais.
  • FIG. 5 there is illustrated a modification of the respirator of the present invention, in which the filter 60 is formed as a complete unitary sub-assembly, that is to be snapped onto a snout 62 of a slightly modified form of valve structure.
  • the filter assembly is formed entirely separate from the face piece 12, and is adapted to be snapped onto a snout 62 of the face piece, and subsequently removed therefrom for replacement.
  • the central ring 22 is extended forwardly of the face piece 12, and, at its forward extremity is provided with spring latches 66, such latches being readily formable during the molding of the central ring and its associated structures.
  • the central ring is provided internally with a spider 28 on which the extremely flexible but dimensionally stable flap valve 26 is located.
  • the central ring 22 is provided with a further spider 32d , which supports and positions the central ring 22 within an opening of a mounting plate 68, the mounting plate 68 providing the required attachment 70 to the face piece 12.
  • the filter assembly indicated generally at 60 is a completely pre assembled filter unit, that not only incorporates the filter material 44, but which also can incorporate materials for treating air passing through the filter, such as activated carbon, diatomacious earth, or the like, or which can contain textile fibers that have been provided with an electrostatic charge.
  • the filter 44 is encased within an extremely thin-walled shell of thermo-formable plastics sheeting, the rear face 30 of which has been vacuum formed to provide ribs 24a providing air channels as in the previous embodiment, and which extend up to a central opening 32a in the back wall 30a.
  • the front wall 42a is formed as a perforate surface permitting the passage of air into and through the filter, the front and rear walls being fused to each other in any convenient manner, to provide an enclosing envelope for the contained filter material, and is provided with lugs 16 for the attachment of straps.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Pulmonology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Claims (8)

  1. Appareil respiratoire (10) constituant un masque à poussière et qui comprend une pièce frontale (12) formé d'un matériau analogue au caoutchouc, des soupapes d'inhalation et d'exhalation (34, 26) associées à la pièce frontale (12) et une cartouche filtrante (44) à travers laquelle de l'air peut être inhalé dans la pièce frontale (12), cet appareil étant caractérisé en ce que les soupapes d'inhalation et d'exhalation respectives (34, 26) se combinent l'une à l'autre en un ensemble unitaire (22, 34, 26) et sont disposées concentriquement, la soupape d'inhalation annulaire (34) étant disposée radialement à l'extérieur de la soupape d'exhalation (26) et concentriquement vis-à-vis de celle-ci, la soupape d'inhalation (34) communiquant avec un ensemble de filtration sensiblement plat (14, 30, 44, 42) soutenu par l'ensemble à soupapes (22, 34, 26) et qui s'étend latéralement vis-à-vis de l'axe d'agencement concentrique des soupapes.
  2. Appareil respiratoire selon la revendication 1, dans lequel l'ensemble à soupapes comprend un corps de soupape sensiblement rigide qui est disposé à l'intérieur d'une ouverture frontale de la pièce frontale et qui est connectée directement à celle-ci, le corps de soupape comprenant une paroi cylindrique centrale (22) qui constitue un siège de soupape interne pour la soupape d'exhalation (26) et un siège de soupape extérieur à la paroi cylindrique précitée pour la soupape d'inhalation (34).
  3. Appareil respiratoire selon la revendication 2, dans lequel la paroi cylindrique (22) comprend un croisillon interne (28) pour supporter la soupape d'exhalation (26) et fournit un support direct à la soupape d'inhalation annulaire (34), la paroi cylindrique étant supportée sur le corps de soupape par un second croisillon (32d).
  4. Appareil respiratoire selon l'une et/ou l'autre des revendications précédentes, dans lequel l'ensemble de filtration (14, 30, 44, 42) comprend une paroi arrière imperméable (30) supportée directement par le corps de soupape et qui se termine, sur ses bords, par un élément de châssis périphérique (20), la paroi arrière comportant des nervures (24) espacées s'étendant vers l'avant sur sa surface qui se présente vers l'avant afin de supporter et de positionner un élément de filtration (44), les nervures formant des canaux sensiblement non obstrués pour l'air filtré qui est acheminé directement à la soupape d'inhalation (34).
  5. Appareil respiratoire selon la revendication 4 comprenant un élément de retenue perforé (42) qui est fixé de manière à pouvoir être retiré au châssis périphérique (20) de la paroi arrière pour soutenir l'élément de filtration (44) en position correcte contre les nervures espacées (24).
  6. Appareil respiratoire selon l'une et/ou l'autre des revendications 4 et 5, caractérisé en ce que l'ensemble de filtration (14, 30, 44, 42) est dièdrique en plan et s'étend latéralement vis-à-vis de la pièce frontale (12) jusqu'à ses côtés opposés, fournissant de la sorte une surface de filtration fortement accrue tout en minimisant les tensions imposées à la pièce frontale (12) par des mouvements rapide de la tête de l'utilisateur.
  7. Appareil respiratoire selon l'une et/ou l'autre des revendications précédentes, comprenant un harnais (16) fixé directement à l'ensemble de filtration (14, 30, 44, 42), permettant ainsi un mouvement libre de la pièce frontale (12) relativement à l'ensemble de filtration et l'isolation de la pièce frontale vis-à-vis des tensions exercées sur le harnais.
  8. L'appareil respiratoire selon l'une et/ou l'autre des revendications précédentes, comprenant un déflecteur d'air (50) associé à la soupape d'exhalation et qui dirige l'air exhalé vers le bas à l'écart des yeux de l'utilisateur.
EP19860306861 1985-04-09 1986-09-05 Masque respiratoire à élément de filtrage interchangeable Expired EP0258508B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/721,284 US4630604A (en) 1985-04-09 1985-04-09 Valve assembly for a replaceable filter respirator
EP19860306861 EP0258508B1 (fr) 1986-09-05 1986-09-05 Masque respiratoire à élément de filtrage interchangeable
DE8686306861T DE3678442D1 (de) 1986-09-05 1986-09-05 Atemschutzmaske mit auswechselbarem filterelement.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860306861 EP0258508B1 (fr) 1986-09-05 1986-09-05 Masque respiratoire à élément de filtrage interchangeable

Publications (2)

Publication Number Publication Date
EP0258508A1 EP0258508A1 (fr) 1988-03-09
EP0258508B1 true EP0258508B1 (fr) 1991-03-27

Family

ID=8196128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860306861 Expired EP0258508B1 (fr) 1985-04-09 1986-09-05 Masque respiratoire à élément de filtrage interchangeable

Country Status (2)

Country Link
EP (1) EP0258508B1 (fr)
DE (1) DE3678442D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD339658S (en) 1991-05-02 1993-09-21 Air-Ace Oy Respirator
WO2013165984A1 (fr) * 2012-04-30 2013-11-07 Scott Technologies, Inc. Demi-masque
WO2013165988A1 (fr) * 2012-04-30 2013-11-07 Scott Technologies, Inc. Demi-masque
USD721169S1 (en) 2012-05-31 2015-01-13 3M Innovative Properties Company Respirator grill ribs
DE102022102888A1 (de) 2022-02-08 2023-08-10 Franz Durst Atemschutz-Halbmaske

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8903266D0 (en) * 1989-02-14 1989-04-05 Hellberg Int Ltd Holder for respirator
FI86258C (fi) * 1990-09-21 1992-08-10 Air Ace Oy Filterrulle foer andningsskydd.
FI87047C (fi) * 1991-05-02 1992-11-25 Air Ace Oy Luftvaexlingssystem foer andningsskydd och andningsskydd
DE4138172C2 (de) * 1991-11-21 1994-06-09 Draegerwerk Ag Halbmaske
FR2854808B1 (fr) 2003-05-16 2005-11-11 Robert Schegerin Filtre interne amovible de masque a mise en place rapide pour pilotes d'avions
US8104472B2 (en) 2004-03-26 2012-01-31 3M Innovative Properties Company Non-elastomeric respirator mask that has deformable cheek portions
KR200461497Y1 (ko) 2012-01-16 2012-08-03 주식회사 제일뢰스텍 방진마스크
CN104757711B (zh) * 2015-03-24 2017-01-04 东莞市启原实业有限公司 防护型环保口罩
CN107798317B (zh) * 2017-11-30 2024-06-04 安徽汇鑫电子有限公司 非法干扰信号实时监测报警设备
KR102108209B1 (ko) 2018-08-01 2020-05-28 와이지에프 주식회사 흡배기 구조를 가지는 마스크
IT202000007309A1 (it) * 2020-04-06 2021-10-06 Spectre S R L Maschera di protezione facciale con filtro rimovibile
IT202000007390A1 (it) * 2020-04-07 2020-07-07 Morphica S R L Mascherina filtrante multiuso
WO2021213934A1 (fr) * 2020-04-21 2021-10-28 Markus Mezger Masque couvrant le nez et la bouche et partie principale pour celui-ci
FR3109700A1 (fr) 2020-05-01 2021-11-05 Concept Composites Auvergne 2Ca Masque de protection avec filtre interchangeable
DE202020102872U1 (de) 2020-05-19 2020-06-10 Deep GmbH Atemschutzmaske

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029812A (en) * 1958-03-03 1962-04-17 Welsh Mfg Co Respirator
US3467093A (en) * 1966-12-09 1969-09-16 Sierra Eng Co Oxygen mask and valve structure
GB2105177B (en) * 1981-09-01 1985-06-26 Yoshimasa Nakagawa A head and face protecting hood
US4501272A (en) * 1981-10-30 1985-02-26 Shigematsu Works Co., Ltd. Mask

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD339658S (en) 1991-05-02 1993-09-21 Air-Ace Oy Respirator
WO2013165984A1 (fr) * 2012-04-30 2013-11-07 Scott Technologies, Inc. Demi-masque
WO2013165988A1 (fr) * 2012-04-30 2013-11-07 Scott Technologies, Inc. Demi-masque
USD721169S1 (en) 2012-05-31 2015-01-13 3M Innovative Properties Company Respirator grill ribs
DE102022102888A1 (de) 2022-02-08 2023-08-10 Franz Durst Atemschutz-Halbmaske

Also Published As

Publication number Publication date
DE3678442D1 (de) 1991-05-02
EP0258508A1 (fr) 1988-03-09

Similar Documents

Publication Publication Date Title
US4630604A (en) Valve assembly for a replaceable filter respirator
EP0258508B1 (fr) Masque respiratoire à élément de filtrage interchangeable
US4873972A (en) Disposable filter respirator with inner molded face flange
US11285344B2 (en) Personal air filtration apparatus and method
AU2002303617B2 (en) Respirator valve
AU595840B2 (en) Respirator
US11266861B2 (en) Face mask assembly
US9993668B2 (en) Face mask assembly
US20210353980A1 (en) Multi-flap valve for a respiratory device
AU2002303617A1 (en) Respirator valve
CA2676532A1 (fr) Valve de fluide dotee d'un montant central
JPH05177006A (ja) 呼吸用マスク
US4674136A (en) Safety mask construction
US11911637B2 (en) Mask
KR101915179B1 (ko) 마스크
KR20200054942A (ko) 오염 방지 얼굴 마스크
JPS6371270A (ja) 交換可能なフイルタ付呼吸マスク
KR20240008326A (ko) 재사용이 가능한 고-여과성 안면 마스크
EP4201487B1 (fr) Unité de masque facial de protection avec un filtre supplémentaire pour l'air expiré
CA1269587A (fr) Soupape d'appareil d'aide a la respiration
CN111135498A (zh) 防护面罩
KR930009922B1 (ko) 방진 마스크
FI84560B (fi) Ventildel till en med utbytbart filter foersedd gasmask.
CN211932713U (zh) 口罩及防护套装
CZ2021485A3 (cs) Filtrační prostředek

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19880707

17Q First examination report despatched

Effective date: 19891120

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB NL SE

REF Corresponds to:

Ref document number: 3678442

Country of ref document: DE

Date of ref document: 19910502

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 86306861.5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950825

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950914

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950918

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19950920

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19950922

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960905

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19960906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19970401

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960905

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19970401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970603

EUG Se: european patent has lapsed

Ref document number: 86306861.5

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST