EP0286016A1 - Dust filter in the shape of a half-mask - Google Patents

Dust filter in the shape of a half-mask Download PDF

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Publication number
EP0286016A1
EP0286016A1 EP88105244A EP88105244A EP0286016A1 EP 0286016 A1 EP0286016 A1 EP 0286016A1 EP 88105244 A EP88105244 A EP 88105244A EP 88105244 A EP88105244 A EP 88105244A EP 0286016 A1 EP0286016 A1 EP 0286016A1
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EP
European Patent Office
Prior art keywords
edge
mask
filter
frame
lid
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.)
Granted
Application number
EP88105244A
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German (de)
French (fr)
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EP0286016B1 (en
Inventor
Joachim Schlobohm
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.)
Draegerwerk AG and Co KGaA
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Draegerwerk AG and Co KGaA
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
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Application filed by Draegerwerk AG and Co KGaA filed Critical Draegerwerk AG and Co KGaA
Publication of EP0286016A1 publication Critical patent/EP0286016A1/en
Application granted granted Critical
Publication of EP0286016B1 publication Critical patent/EP0286016B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 invention relates to a half-mask-shaped particulate filter, which is releasably pressed onto a conformable frame as a sealing edge by a circumferential holding piece.
  • Such half masks are used, for example, as dust filters underground or as light protective masks in work areas in which dust-like or droplet-shaped particles that damage the respiratory tract can occur.
  • Such a half mask has been described, for example, in DE-OS 30 32 437.
  • the well-known half mask exists u. a. from a pleated dust filter, the edge of which is drawn over the bead-shaped frame as a sealing edge and is pressed around the bead and pressed inwards.
  • a holding frame is stretched around the edge of the mask, to which the drawstring is also attached.
  • the attached half mask has only the filter material visible to the outside as the mask body, which is therefore exposed to mechanical influences and unprotected from the environment. Furthermore, the filter material, which is folded over the sealing edge, must take over the sealing function between the mask edge and the face of the mask wearer. Damage to both the filtering part of the half mask and the filter part acting as a sealing surface and resting on the face lead to a noticeable and undesirable reduction in filter performance.
  • the filter structure may loosen due to the unavoidable rubbing of the sealing edge, so that both a fragmentary dissolution of the filter material and cracking and thus undesirable leaks can occur.
  • the present invention is therefore based on the object of improving a half-mask-shaped particulate filter of the type mentioned in such a way that effective protection against external mechanical damage, a smooth and clean, resistant sealing surface on the edge of the mask and a problem-free replacement of the filter which can be accomplished in a simple manner can be achieved.
  • the holding piece in the form of a permeable cover surrounds the suspended matter filter designed as a filter insert, the edge region of which is tightly clamped between the edge of the cover and the otherwise uncovered frame.
  • a used filter insert can be replaced in a simple manner by detaching the cover from the frame, removing the used filter insert and inserting a new one into the cover.
  • the lid and the new filter insert are then pressed onto the frame and clamped in with a single simple movement. This ensures that the filter insert is held tightly on the frame.
  • the bulge-shaped part of the frame that lies against the face of the mask wearer remains free of filter material, so that a clean and tight fit with the aid of the head harness is ensured even during a hard operation.
  • the lid rim presses the edge area against the outer fit of the frame when the filter insert is clamped.
  • the edge area of the filter is designed as a fold-over brim in which the lid edge is inserted. This enables the filter insert to be securely seated in the cover while it is being replaced.
  • the lid and the frame are expediently held together by at least two pull connections, which are at the same time designed as a tab fastening for the head harness.
  • the drawstring and the cover attachment on the frame engage the same attachment point. In this way, a simple double fastening for the lid and the frame is obtained, which is easy to handle and inexpensive to produce.
  • a particularly good tensioning effect is achieved in that the tab fastening acts on the outer edge of the lid.
  • the head strap then not only causes the frame to lie against the face of the mask wearer, but at the same time the lid is pressed against the frame and thus ensures a constant tension on the edge area of the filter insert even during a hard operation.
  • a reinforcing strip can be attached along the inner surface of the frame.
  • a half-mask-shaped particulate filter is shown in section, which has a frame (1), which is designed in its shape as a sealing edge conformable to the face of the mask wearer, over which a cover (2) is placed, in which the filter insert trained particulate filter (3) is used.
  • the filter insert (3) is pressed in its edge region (4) by the lid edge (5) against the outer contour of the sealing edge (1).
  • the edge area (4) of the filter insert (3) is turned around the lid edge (5) into a brim (7).
  • a reinforcing strip (8) is attached to the contact surface between the lid edge (5) and the edge area (4) of the filter insert (3) along the inner surface of the sealing edge (1).
  • rubber-elastic tabs (9) are formed on the circumference of the sealing edge (1). The ends (10) of the tabs (9) can be buttoned in via the buttons (12) which are arranged along the outer surface of the lid edge (5) at the same distance from one another as the tabs (9) along the sealing edge (1) are .
  • buttons (12) are attached to the buttons (12), in which the head band (11), which is designed as an endless elastic band, is accommodated in a slightly displaceable manner.
  • the head harness (11) can thereby adapt itself to the various needs, be it that the device is in standby with an enlarged loop around the neck or held in operation with both loops over the back of the head.
  • the cover (2) is provided with openings (14).
  • the tabs (9) are opened, the cover (2) is detached from the frame (1) and the suspended particle filter (3) now exposed is removed from the cover (2) and a new one is inserted.
  • the brim (7) is placed around the edge of the cover (5) so that the filter insert (3) is fixed in its position and the cover (2) with the filter insert (3) can be placed on the sealing edge (1) without slipping .

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The dust filter, which is pressed releasably by means of a surrounding retaining piece onto a frame (1) which is able to bear closely against it as a sealing edge is to be improved to achieve effective protection against external mechanical damage, a smooth and neat, resistant sealing surface at the edge of the mask and trouble- free exchanging of the filter, to be accomplished by simple manipulations. It is provided for this purpose that the retaining piece in the form of a permeable cover (2) surrounds the filter (3), designed as a filter insert, the edge region (4) of which is clamped in a sealing manner between the cover edge (5) and the otherwise uncovered frame (1). <IMAGE>

Description

Die Erfindung betrifft einen halbmaskenförmigen Schwebstoffilter, der auf einem anschmiegsamen Rahmen als Dichtrand durch ein umlaufendes Haltestück lösbar aufgedrückt ist.The invention relates to a half-mask-shaped particulate filter, which is releasably pressed onto a conformable frame as a sealing edge by a circumferential holding piece.

Derartige Halbmasken werden beispielsweise als Staubfilter unter Tage oder auch als leichte Schutzmasken in solchen Arbeitsbereichen eingesetzt, in denen staubförmige oder auch tröpfchenförmige, die Atemwege schädigende Partikel auftreten können. Eine solche Halbmaske ist beispielsweise in der DE-OS 30 32 437 beschrieben worden.Such half masks are used, for example, as dust filters underground or as light protective masks in work areas in which dust-like or droplet-shaped particles that damage the respiratory tract can occur. Such a half mask has been described, for example, in DE-OS 30 32 437.

Die bekannte Halbmaske besteht u. a. aus einem gefalteten Staubfilter, dessen Rand über den wulstförmig ausgebildeten Rahmen als Dichtrand gezogen ist und um den Wulst nach innen umgeschlagen pressend anliegt. Zur rutschfesten Sicherung des Filters ist um den Maskenrand ein Halterahmen gespannt, an welchem auch die Zugbänderung befestigt ist.The well-known half mask exists u. a. from a pleated dust filter, the edge of which is drawn over the bead-shaped frame as a sealing edge and is pressed around the bead and pressed inwards. For the non-slip securing of the filter, a holding frame is stretched around the edge of the mask, to which the drawstring is also attached.

Die aufgesetzte Halbmaske besitzt nach außen hin als Maskenkörper sichtbar ausschließlich das Filtermaterial, welches somit ungeschützt vor mechanischen Beschädigungen den Umgebungseinflüssen ausgesetzt ist. Weiterhin muß das Filtermaterial, welches um den Dichtrand umgeschlagen ist, die Dichtfunktion zwischen Maskenrand und Gesicht des Maskenträgers übernehmen. Beschädigungen sowohl am filtrierenden Teil der Halbmaske als auch an dem als Dichtfläche wirkenden, am Gesicht aufliegenden Filterteil führen zu einer merkbaren und unerwünschten Herabsetzung der Filterleistung.The attached half mask has only the filter material visible to the outside as the mask body, which is therefore exposed to mechanical influences and unprotected from the environment. Furthermore, the filter material, which is folded over the sealing edge, must take over the sealing function between the mask edge and the face of the mask wearer. Damage to both the filtering part of the half mask and the filter part acting as a sealing surface and resting on the face lead to a noticeable and undesirable reduction in filter performance.

Ein Auswechseln des verbrauchten Filters gegen ein unbenutztes ist aufwendig, da beim Anlegen des neuen Filters auf ein faltenfreies, glattes Anliegen der um den Dichtrand umgeschlagenen Dichtfläche geachtet werden muß. Dies bedeutet eine im Einsatzfall nicht immer voraussetzbare Sorgfalt und Geschicklichkeit bei der Handhabung.Replacing the used filter with an unused one is time-consuming, since when the new filter is put on, care must be taken to ensure that the sealing surface folded over around the sealing edge is free of wrinkles. This means that care and dexterity in handling are not always required in the case of use.

Weiterhin kann bei längerem Tragen der Maske durch unvermeidbare Reibung des Dichtrandes an der Hautoberfläche eine Lockerung der Filterstruktur auftreten, so daß sowohl eine bruchstückhafte Auflösung des Filtermaterials als auch eine Rißbildung und somit unerwünschte Undichtigkeiten entstehen können.Furthermore, when the mask is worn for a longer period of time, the filter structure may loosen due to the unavoidable rubbing of the sealing edge, so that both a fragmentary dissolution of the filter material and cracking and thus undesirable leaks can occur.

Der vorliegenden Erfindung liegt somit die Aufgabe zugrunde, ein halbmaskenförmig ausgebildetes Schwebstoffilter der genannten Art so zu verbessern, daß ein wirksamer Schutz gegen äußere mechanische Beschädigung, eine glatte und saubere, widerstandsfähige Dichtfläche am Maskenrand und ein problemloses, mit einfachen Handgriffen zu bewerkstelligendes Auswechseln des Filters erreicht werden.The present invention is therefore based on the object of improving a half-mask-shaped particulate filter of the type mentioned in such a way that effective protection against external mechanical damage, a smooth and clean, resistant sealing surface on the edge of the mask and a problem-free replacement of the filter which can be accomplished in a simple manner can be achieved.

Die Lösung der Aufgabe erfolgt dadurch, daß das Haltestück in Form eines durchlässigen Deckels den als ein Filtereinsatz ausgebildeten Schwebstoffilter umgibt, dessen Randbereich zwischen dem Deckelrand und dem ansonsten unbedeckten Rahmen dichtend eingespannt ist.The object is achieved in that the holding piece in the form of a permeable cover surrounds the suspended matter filter designed as a filter insert, the edge region of which is tightly clamped between the edge of the cover and the otherwise uncovered frame.

Die mit der Erfindung erzielten Vorteile liegen im wesentlichen darin, daß ein wirksamer Schutz vor allem gegen mechanische Beschädigungen des Filtereinsatzes erreicht wurde. Das Auswechseln eines verbrauchten Filtereinsatzes kann auf einfache Weise dadurch erfolgen, daß der Deckel von dem Rahmen gelöst, der verbrauchte Filtereinsatz entfernt und ein neuer in den Deckel eingelegt wird.The advantages achieved with the invention are essentially that effective protection, above all against mechanical damage to the filter insert, has been achieved. A used filter insert can be replaced in a simple manner by detaching the cover from the frame, removing the used filter insert and inserting a new one into the cover.

Durch einen einzigen einfachen Handgriff wird dann der Deckel samt dem neuen Filtereinsatz auf den Rahmen gedrückt und eingespannt. Dadurch ist auf sichere Weise ein dichtes Halten des Filtereinsatzes auf dem Rahmen verwirklicht. Dabei bleibt der dem Gesicht des Maskenträgers anliegende, wulstförmig ausgebildete Teil des Rahmens frei von Filtermaterial, so daß ein sauberes und dichtes Anliegen mit Hilfe der Kopfbänderung auch während eines harten Einsatzbetriebes gewährleistet ist. Beim Einspannen des Filtereinsatzes werden fertigungsbedingte Maßabweichungen überbrückt, so daß ein genauer Paßzuschnitt des Filtereinsatzes nicht erforderlich ist. Der Deckelrand drückt nämlich beim Einspannen des Filtereinsatzes dessen Randbereich an die äußere Paßform des Rahmens an.The lid and the new filter insert are then pressed onto the frame and clamped in with a single simple movement. This ensures that the filter insert is held tightly on the frame. The bulge-shaped part of the frame that lies against the face of the mask wearer remains free of filter material, so that a clean and tight fit with the aid of the head harness is ensured even during a hard operation. When clamping the filter insert, manufacturing-related dimensional deviations are bridged, so that a precise fit of the filter insert is not necessary. The lid rim presses the edge area against the outer fit of the frame when the filter insert is clamped.

Um das Einsetzen des Schwebstoffilters in den Deckel zu erleichtern, ist der Randbereich des Filters als eine umschlagbare Krempe ausgebildet, in welche der Deckelrand eingelegt ist. Dadurch wird ein sicherer Sitz des Filtereinsatzes in dem Deckel während seines Auswechselns ermöglicht.In order to make it easier to insert the suspended matter filter into the lid, the edge area of the filter is designed as a fold-over brim in which the lid edge is inserted. This enables the filter insert to be securely seated in the cover while it is being replaced.

Zweckmäßigerweise werden der Deckel und der Rahmen durch mindestens zwei Zugverbindungen zusammengehalten, welche zugleich als Laschenbefestigung für die Kopfbänderung ausgebildet sind. Dadurch greifen einmal die Zugbänderung und zum anderen die Deckelbefestigung an den Rahmen am gleichen Befestigungspunkt an. Man erhält auf diese Weise eine einfache Doppelbefestigung für den Deckel und den Rahmen, die leicht zu handhaben und billig herstellbar ist.The lid and the frame are expediently held together by at least two pull connections, which are at the same time designed as a tab fastening for the head harness. As a result, the drawstring and the cover attachment on the frame engage the same attachment point. In this way, a simple double fastening for the lid and the frame is obtained, which is easy to handle and inexpensive to produce.

Eine besonders gute Spannwirkung wird dadurch erreicht, daß die Laschenbefestigung am äußeren Deckelrand angreift. Die Kopfbänderung bewirkt dann nicht nur ein Anliegen des Rahmens an das Gesicht des Maskenträgers, sondern gleichzeitig wird der Deckel gegen den Rahmen gedrückt und sorgt somit für eine ständige Spannkraft auf den Randbereich des Filtereinsatzes auch während eines harten Betriebseinsatzes.A particularly good tensioning effect is achieved in that the tab fastening acts on the outer edge of the lid. The head strap then not only causes the frame to lie against the face of the mask wearer, but at the same time the lid is pressed against the frame and thus ensures a constant tension on the edge area of the filter insert even during a hard operation.

Zur Unterstützung der Einspannung des Randbereichs des Filtereinsatzes zwischen Rahmen und Deckelrand kann entlang der Innenfläche des Rahmens eine Verstärkungsleiste angebracht sein.To support the clamping of the edge area of the filter insert between the frame and the lid edge, a reinforcing strip can be attached along the inner surface of the frame.

Ein Ausführungsbeispiel der Erfindung wird anhand einer schematischen Zeichnung dargestellt und im folgenden näher erläutert.An embodiment of the invention is illustrated by a schematic drawing and explained in more detail below.

In der einzigen Figur ist ein halbmaskenförmiger Schwebstoffilter im Schnitt dargestellt, der einen Rahmen (1) besitzt, welcher in seiner Form als ein dem Gesicht des Maskenträgers anschmiegsamer Dichtrand ausgebildet ist, über den ein Deckel (2) gestülpt ist, in dem der als Filtereinsatz ausgebildete Schwebstoffilter (3) eingesetzt ist. Der Filtereinsatz (3) wird in seinem Randbereich (4) von dem Deckelrand (5) gegen die äußere Kontur des Dichtrandes (1) gedrückt. Der Randbereich (4) des Filtereinsatzes (3) ist um den Deckelrand (5) zu einer Krempe (7) umgeschlagen.In the single figure, a half-mask-shaped particulate filter is shown in section, which has a frame (1), which is designed in its shape as a sealing edge conformable to the face of the mask wearer, over which a cover (2) is placed, in which the filter insert trained particulate filter (3) is used. The filter insert (3) is pressed in its edge region (4) by the lid edge (5) against the outer contour of the sealing edge (1). The edge area (4) of the filter insert (3) is turned around the lid edge (5) into a brim (7).

Zur weiteren Versteifung des Dichtrandes (1) ist an der Auflagefläche zwischen Deckelrand (5) und Randbereich (4) des Filtereinsatzes (3) eine Verstärkungsleiste (8) entlang der Innenfläche des Dichtrandes (1) angebracht. Zum Einspannen des Filtereinsatzes (3) durch den Deckel (2) auf den Dichtrand (1) sind am Umfang des Dichtrands (1) gummielastische Laschen (9) angeformt. Die Laschen (9) sind mit ihren Enden(10) über die Knöpfe (12) einknöpfbar, welche entlang der Außenfläche des Deckelrands (5) in demselben Abstand zueinander angeordnet sind, wie es die Laschen (9) entlang des Dichtrands (1) sind. Zwischen den Laschen (9) und dem Deckelrand (5) sind auf den Knöpfen (12) Ösen (13) aus einem Kunststoffband befestigt, in denen die als endloses elastisches Band ausgebildete Kopfbänderung (11) leicht verschieblich aufgenommen ist. Die Kopfbänderung (11) kann sich dadurch selbsttätig den verschiedenen Bedürfnissen anpassen, sei es, daß das Gerät in der Bereitschaft mit einer vergrößerten Schlaufe um den Hals getragen oder im Betrieb mit beiden Schlaufen über dem Hinterkopf gehalten wird. Der Deckel (2) ist mit Durchbrüchen (14) versehen.To further stiffen the sealing edge (1), a reinforcing strip (8) is attached to the contact surface between the lid edge (5) and the edge area (4) of the filter insert (3) along the inner surface of the sealing edge (1). To clamp the filter insert (3) through the cover (2) onto the sealing edge (1), rubber-elastic tabs (9) are formed on the circumference of the sealing edge (1). The ends (10) of the tabs (9) can be buttoned in via the buttons (12) which are arranged along the outer surface of the lid edge (5) at the same distance from one another as the tabs (9) along the sealing edge (1) are . Between the tabs (9) and the lid edge (5) eyelets (13) made of a plastic band are attached to the buttons (12), in which the head band (11), which is designed as an endless elastic band, is accommodated in a slightly displaceable manner. The head harness (11) can thereby adapt itself to the various needs, be it that the device is in standby with an enlarged loop around the neck or held in operation with both loops over the back of the head. The cover (2) is provided with openings (14).

Zum Auswechseln des Filtereinsatzes (3) werden die Laschen (9) geöffnet, der Deckel (2) von dem Rahmen (1) gelöst und der jetzt freiliegende Schwebstoffilter (3) dem Deckel (2) entnommen und ein neuer eingelegt. Dabei wird die Krempe (7) um den Deckelrand (5) gelegt, so daß der Filtereinsatz (3) in seiner Lage fixiert ist und der Deckel (2) mit dem Filtereinsatz (3) ohne Verrutschen auf den Dichtrand (1) aufgesetzt werden kann.To replace the filter insert (3), the tabs (9) are opened, the cover (2) is detached from the frame (1) and the suspended particle filter (3) now exposed is removed from the cover (2) and a new one is inserted. The brim (7) is placed around the edge of the cover (5) so that the filter insert (3) is fixed in its position and the cover (2) with the filter insert (3) can be placed on the sealing edge (1) without slipping .

Claims (5)

1. Halbmaskenförmiger Schwebstoffilter, der auf einem anschmiegsamen Rahmen als Dichtrand durch ein umlaufendes Haltestück lösbar aufgedrückt ist, dadurch gekennzeichnet, daß das Haltestück in Form eines durchlässigen Deckels (2) den als ein Filtereinsatz ausgebildeten Schwebstoffilter (3) umgibt, dessen Randbereich (4) zwischen dem Deckelrand (5) und dem ansonsten unbedeckten Rahmen (1) dichtend eingespannt ist.1. Half-mask-shaped suspended matter filter, which is releasably pressed onto a conformable frame as a sealing edge by a circumferential holding piece, characterized in that the holding piece in the form of a permeable cover (2) surrounds the suspended matter filter (3) designed as a filter insert, the edge area (4) of which is tightly clamped between the lid edge (5) and the otherwise uncovered frame (1). 2. Halbmaskenförmiger Schwebstoffilter nach Anspruch 1, dadurch gekennzeichnet, daß der Randbereich (4) des Filters (3) als eine um den äußeren Deckelrand (5) umschlagbare Krempe (7) ausgebildet ist.2. Half-mask-shaped particulate filter according to claim 1, characterized in that the edge region (4) of the filter (3) is designed as a brim (7) which can be turned over around the outer lid edge (5). 3. Halbmaskenförmiger Schwebstoffilter nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Deckel (2) und der Rahmen (1) durch mindestens zwei Zugverbindungen (9, 10, 12) zusammengehalten sind, welche zugleich als Befestigung für die Kopfbänderung (11) ausgebildet sind.3. Half-mask-shaped particulate filter according to one of claims 1 and 2, characterized in that the cover (2) and the frame (1) are held together by at least two train connections (9, 10, 12), which at the same time as a fastening for the head harness (11th ) are trained. 4. Halbmaskenförmiger Schwebstoffilter nach Anspruch 3, dadurch gekennzeichnet, daß die Kopfbänderung (11) am äußeren Deckelrand (5) angreift.4. Half-mask-shaped particulate filter according to claim 3, characterized in that the head strap (11) engages on the outer edge of the lid (5). 5. Halbmaskenförmiger Schwebstoffilter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß entlang der Innenfläche des Rahmens (1) eine gegen die Einspannkraft des Deckelrandes (5) wirkende Verstärkungsleiste (8) angebracht ist.5. Half-mask-shaped particulate filter according to one of claims 1 to 4, characterized in that along the inner surface of the frame (1) against the clamping force of the lid edge (5) acting reinforcing strip (8) is attached.
EP88105244A 1987-04-04 1988-03-31 Dust filter in the shape of a half-mask Expired - Lifetime EP0286016B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3711505 1987-04-04
DE3711505A DE3711505A1 (en) 1987-04-04 1987-04-04 HALF-MASK-DESIGNED HEPAID FILTER

Publications (2)

Publication Number Publication Date
EP0286016A1 true EP0286016A1 (en) 1988-10-12
EP0286016B1 EP0286016B1 (en) 1991-02-20

Family

ID=6324938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105244A Expired - Lifetime EP0286016B1 (en) 1987-04-04 1988-03-31 Dust filter in the shape of a half-mask

Country Status (4)

Country Link
EP (1) EP0286016B1 (en)
DE (2) DE3711505A1 (en)
ES (1) ES2021779B3 (en)
ZA (1) ZA88616B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009209A2 (en) * 1989-02-14 1990-08-23 Hellberg International Limited Holder for respirator
EP1243291A1 (en) * 2001-03-23 2002-09-25 Shigematsu Works Co., Ltd. A filter and a disposable dustproof mask with use of said filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR546686A (en) * 1921-12-21 1922-11-21 Air filter
US3014479A (en) * 1959-05-20 1961-12-26 Welsh Mfg Co Respirator
GB974960A (en) * 1961-12-19 1964-11-11 Ostravskokarvinsky Revir Valveless dustproof respirator
DE3032437A1 (en) * 1980-08-28 1982-03-11 Drägerwerk AG, 2400 Lübeck Dust filter in form of half face mask - has corrugated paper filtering material edges fixed by support ring, abutting rigid conical edge ring

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2201315A (en) * 1936-11-13 1940-05-21 American Optical Corp Respirator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR546686A (en) * 1921-12-21 1922-11-21 Air filter
US3014479A (en) * 1959-05-20 1961-12-26 Welsh Mfg Co Respirator
GB974960A (en) * 1961-12-19 1964-11-11 Ostravskokarvinsky Revir Valveless dustproof respirator
DE3032437A1 (en) * 1980-08-28 1982-03-11 Drägerwerk AG, 2400 Lübeck Dust filter in form of half face mask - has corrugated paper filtering material edges fixed by support ring, abutting rigid conical edge ring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009209A2 (en) * 1989-02-14 1990-08-23 Hellberg International Limited Holder for respirator
WO1990009209A3 (en) * 1989-02-14 1991-02-21 Hellberg Int Ltd Holder for respirator
EP1243291A1 (en) * 2001-03-23 2002-09-25 Shigematsu Works Co., Ltd. A filter and a disposable dustproof mask with use of said filter

Also Published As

Publication number Publication date
ZA88616B (en) 1988-08-02
EP0286016B1 (en) 1991-02-20
DE3861780D1 (en) 1991-03-28
ES2021779B3 (en) 1991-11-16
DE3711505A1 (en) 1988-10-20
DE3711505C2 (en) 1989-10-19

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