EP0286016B1 - Dust filter in the shape of a half-mask - Google Patents
Dust filter in the shape of a half-mask Download PDFInfo
- Publication number
- EP0286016B1 EP0286016B1 EP88105244A EP88105244A EP0286016B1 EP 0286016 B1 EP0286016 B1 EP 0286016B1 EP 88105244 A EP88105244 A EP 88105244A EP 88105244 A EP88105244 A EP 88105244A EP 0286016 B1 EP0286016 B1 EP 0286016B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- edge
- mask
- filter
- frame
- cover
- 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 - Lifetime
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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 invention relates to a half-mask-shaped particulate filter according to the features of the preamble of claim 1.
- 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 in GB-A-974 960.
- the known particulate filter is clamped between a cover and a frame.
- the edge of the lid overlaps the filter edge and lies directly on the frame.
- the filter edge is set back compared to the contact line between the lid edge and the frame, so that the contact line can act as a self-tensioning sealing line.
- the attached lid must sit on the frame in an exciting way.
- the short filter edge does not hold the filter insert securely on the frame when the cover is removed.
- the lid must be placed on the filter insert with extreme care so that the short edge support of the filter is not accidentally shifted by the precisely fitting lid edge. This would reduce the filter effect. It is also not possible to check whether the edge of the filter has remained completely lying on the frame when the cover is replaced. This means considerable uncertainty for use.
- Another known half mask according to DE-A-30 32 437 exists inter alia. from a pleated dust filter, the edge of which is drawn over the bulge-shaped frame as a sealing edge and lies pressed around the bulge and pressed inwards. To secure the filter in a non-slip manner, 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 from the outside as the mask body, which is therefore exposed to mechanical influences without protection from mechanical damage. Furthermore, the filter material, which is turned around 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 unavoidable friction of the sealing edge on the skin surface, so that both a fragmentary dissolution of the filter material and crack formation and thus undesirable leaks can occur.
- the present invention is therefore based on the object to improve a half-mask-shaped particulate filter of the type mentioned so that effective protection against external mechanical damage, a smooth and clean, resistant sealing surface on the edge of the mask and a problem-free, easy to handle replacement of the filter can be 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.
- 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 support of the filter insert always lies tightly around the frame; when replacing the insert, as with the previously known insert, care must not be taken to ensure that the filter edge is placed on it carefully, because it is held securely flat (and not only in a contact line) by the subsequent fitting and additional clamping of the cover.
- the exact position of the filter insert can also be checked when the cover is in place, since the entire edge area of the filter between the edge of the cover and the frame is clearly visible when securely installed.
- 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 train connection is expediently designed as a fastening for the head harness.
- the drawstring and the cover attachment on the frame attack the same attachment point.
- a simple double fastening for the lid and the frame is obtained, which is easy to handle and inexpensive to manufacture.
- 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 area (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)
Description
Die Erfindung betrifft einen halbmaskenförmigen Schwebstoffilter nach den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a half-mask-shaped particulate filter according to the features of the preamble of claim 1.
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 in der GB-A-974 960 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 in GB-A-974 960.
Der bekannte Schwebstoffilter ist zwischen einem Deckel und einem Rahmen eingespannt. Dabei übergreift der Deckelrand den Filterrand und liegt unmittelbar auf dem Rahmen auf. Der Filterrand ist gegenüber der Berührungslinie Deckelrand _ Rahmen zurückversetzt, damit die Berührungslinie als selbsttätig unter Spannwirkung stehende Dichtlinie wirken kann. Der aufgesetzte Deckel muß also auf den Rahmen spannend aufsitzen.The known particulate filter is clamped between a cover and a frame. The edge of the lid overlaps the filter edge and lies directly on the frame. The filter edge is set back compared to the contact line between the lid edge and the frame, so that the contact line can act as a self-tensioning sealing line. The attached lid must sit on the frame in an exciting way.
Beim Auswechseln des Filtereinsatzes hält der kurze Filterrand bei abgenommenem Deckel den Filtereinsatz nicht genügend sicher auf dem Rahmen. Das Aufsetzen des Deckels auf den Filtereinsatz muß äußerst vorsichtig geschehen, damit die kurze Randauflage des Filters durch den paßgenauen aufzusetzenden Deckelrand nicht versehentlich verschoben wird. Dadurch wäre dann die Filterwirkung gemindert. Auch kann bei neu aufgesetztem Deckel nicht überprüft werden, ob die Randauflage des Filters vollständig rings auf dem Rahmen aufliegend geblieben ist. Dies bedeutet eine erhebliche Unsicherheit für den Gebrauch.When replacing the filter insert, the short filter edge does not hold the filter insert securely on the frame when the cover is removed. The lid must be placed on the filter insert with extreme care so that the short edge support of the filter is not accidentally shifted by the precisely fitting lid edge. This would reduce the filter effect. It is also not possible to check whether the edge of the filter has remained completely lying on the frame when the cover is replaced. This means considerable uncertainty for use.
Wäre der Filterrand über den Deckelrand hinausgeführt, würde die Dichtwirkung verloren gehen, da die zusätzliche Filterbahn die Berührungslinie Deckelrand _ Rahmen unterbrechen würde; der Deckel würde abfallen, da keine weiteren Halteelemente vorhanden sind (die Kopfbänderung greift erst im Rahmen an).If the filter edge were to extend beyond the lid edge, the sealing effect would be lost, since the additional filter web would interrupt the contact line between the lid edge and the frame; the lid would fall off since there are no further holding elements (the head strap only engages in the frame).
Eine weitere bekannte Halbmaske nach der DE-A-30 32 437 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.Another known half mask according to DE-A-30 32 437 exists inter alia. from a pleated dust filter, the edge of which is drawn over the bulge-shaped frame as a sealing edge and lies pressed around the bulge and pressed inwards. To secure the filter in a non-slip manner, 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 from the outside as the mask body, which is therefore exposed to mechanical influences without protection from mechanical damage. Furthermore, the filter material, which is turned around 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 long time, the filter structure may loosen due to unavoidable friction of the sealing edge on the skin surface, so that both a fragmentary dissolution of the filter material and crack formation 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 bewerkstilligendes Auswechseln des Filters erreicht werden.The present invention is therefore based on the object to improve a half-mask-shaped particulate filter of the type mentioned so that effective protection against external mechanical damage, a smooth and clean, resistant sealing surface on the edge of the mask and a problem-free, easy to handle replacement of the filter can be achieved.
Die Lösung der Aufgabe erfolgt durch die kennzeichnenden Merkmale des Anspruchs 1.The problem is solved by the characterizing features of claim 1.
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 by 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 Filterinsatzes 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.
Bei dem Schwebstofilter nach der Erfindung ist sichergestellt, daß die Randauflage des Filtereinsatzes stets umlaufend dicht an dem Rahmen anliegt; beim Auswechseln des Einsatzes braucht nicht, wie bei dem vorbekannten Einsatz, auf eine sorgfältige Auflage des Filterrandes geachtet zu werden, denn er wird durch das nachfolgende Aufsetzen und das zusätzliche Aufspannen des Deckels sicher flächig (und nicht nur in einer Berührungslinie) gehalten.In the case of the floating filter according to the invention, it is ensured that the edge support of the filter insert always lies tightly around the frame; when replacing the insert, as with the previously known insert, care must not be taken to ensure that the filter edge is placed on it carefully, because it is held securely flat (and not only in a contact line) by the subsequent fitting and additional clamping of the cover.
Die genaue Position des Filtereinsatzes kann auch bei aufgesetztem Deckel überprüft werden, da bei sicherer Montage der gesamte Randbereich des Filters zwischen dem Deckelrand und dem Rahmen deutlich sichtbar ist.The exact position of the filter insert can also be checked when the cover is in place, since the entire edge area of the filter between the edge of the cover and the frame is clearly visible when securely installed.
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 ist die Zugverbindung als Befestigung für die Kopfbänderung ausgebildet. 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 train connection is expediently designed as a fastening for the head harness. As a result, the drawstring and the cover attachment on the frame attack 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 manufacture.
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 using 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 area (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)
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 EP0286016A1 (en) | 1988-10-12 |
| EP0286016B1 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8903266D0 (en) * | 1989-02-14 | 1989-04-05 | Hellberg Int Ltd | Holder for respirator |
| JP4927262B2 (en) * | 2001-03-23 | 2012-05-09 | 株式会社重松製作所 | Filter medium and disposable dust mask using the filter medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR546686A (en) * | 1921-12-21 | 1922-11-21 | Air filter | |
| US2201315A (en) * | 1936-11-13 | 1940-05-21 | American Optical Corp | Respirator |
| 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 |
| DE3032437C2 (en) * | 1980-08-28 | 1982-08-05 | Drägerwerk AG, 2400 Lübeck | Half-mask-shaped dust filter |
-
1987
- 1987-04-04 DE DE3711505A patent/DE3711505A1/en active Granted
-
1988
- 1988-01-29 ZA ZA880616A patent/ZA88616B/en unknown
- 1988-03-31 EP EP88105244A patent/EP0286016B1/en not_active Expired - Lifetime
- 1988-03-31 ES ES88105244T patent/ES2021779B3/en not_active Expired - Lifetime
- 1988-03-31 DE DE8888105244T patent/DE3861780D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3711505C2 (en) | 1989-10-19 |
| DE3861780D1 (en) | 1991-03-28 |
| ES2021779B3 (en) | 1991-11-16 |
| DE3711505A1 (en) | 1988-10-20 |
| ZA88616B (en) | 1988-08-02 |
| EP0286016A1 (en) | 1988-10-12 |
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