EP0916369A2 - Procédé et agencement pour fixer un moyen de filtration à un appareil respiratoire - Google Patents

Procédé et agencement pour fixer un moyen de filtration à un appareil respiratoire Download PDF

Info

Publication number
EP0916369A2
EP0916369A2 EP98660114A EP98660114A EP0916369A2 EP 0916369 A2 EP0916369 A2 EP 0916369A2 EP 98660114 A EP98660114 A EP 98660114A EP 98660114 A EP98660114 A EP 98660114A EP 0916369 A2 EP0916369 A2 EP 0916369A2
Authority
EP
European Patent Office
Prior art keywords
filter
attachment boss
cylindrical portion
thread
respiratory apparatus
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
EP98660114A
Other languages
German (de)
English (en)
Other versions
EP0916369A3 (fr
EP0916369B1 (fr
Inventor
Timo Holmlund
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.)
Scott Health and Safety Oy
Original Assignee
Kemira Safety Oy
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 Kemira Safety Oy filed Critical Kemira Safety Oy
Publication of EP0916369A2 publication Critical patent/EP0916369A2/fr
Publication of EP0916369A3 publication Critical patent/EP0916369A3/fr
Application granted granted Critical
Publication of EP0916369B1 publication Critical patent/EP0916369B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A62B7/00—Respiratory apparatus
    • A62B7/10—Respiratory apparatus with filter elements

Definitions

  • the invention relates generally to joints between parts in respiratory apparatuses intended for removing detrimental substances from respiratory air.
  • the invention relates in particular to the attachment of a filter to the blower part of the respiratory apparatus.
  • a modern respiratory apparatus 100 usually has, in accordance with Figure 1, a face mask 101 intended for being secured over the wearer's face by means of straps and a blower part 102 inside which there is a blower (not shown separately in the figure) which sucks air through a filter or filters 103 and blows the air via a hose 104 to the face mask 101.
  • the filters 103 are in general disposable. It is possible to link to a respiratory apparatus filters having different filtering properties according to the environment in which the wearer of the respiratory apparatus will be. Common filter types include, for example, particle filters and smoke gas filters.
  • FIG. 2 depicts a cross section of a prior art method for attaching a filter 103 to the blower part 102.
  • the filter has a threaded boss 201 the outer surface of which has a male thread 202 according to the DIN 3182 standard.
  • the blower part 102 has a recess 203 the inner surface of which has a corresponding female thread 204. At the bottom of the recess 203 there is a step 205 against which there is placed a ring-like rubber seal 206.
  • the filter 103 is attached to the blower part 102 by screwing its threaded boss 201 into the recess 203, the rim 207 of the outer end of the threaded boss will press against the rubber seal 206 and will seal the joint between the filter and the blower part.
  • the filter always has to be screwed all the way to the bottom of the thread in order for the joint to be tight. If the filter has not been screwed into place properly, the joint between the filter and the blower part will leak, which may be fatal for the wearer.
  • the DIN 3182 standard prescribes that the length of the threaded boss of the filter must be such that, when the filter is screwed into place, some of the thread remains visible, in which case the thread tends to collect dirt and dust. If the apparatus is used in an environment in which the dirt and dust contain detrimental substances, the dirt and dust accumulated in the thread may in time be hazardous.
  • One object of the present invention is to provide a method and arrangement for attaching the filter so that the tightness of the joint is not dependent on whether or not the filter has been screwed all the way home. It is also an object of the invention to provide for the filter an attachment arrangement which is economical in terms of manufacturing techniques. It is a further object of the invention to provide an arrangement which reduces the accumulation of dirt and dust in the thread of the filter.
  • the objects of the invention are achieved by forming a sealing zone on the inner surface of the filter attachment boss.
  • the arrangement according to the invention is characterized in that it comprises in the first part of the respiratory apparatus a cylindrical portion the outer diameter of which is smaller than the inner diameter of the attachment boss of the filter, and that it additionally comprises means for forming a sealing zone between the outer surface of the said cylindrical portion and the inner surface of the said attachment boss.
  • the invention also relates to a method which is characterized in that therein a sealing zone is formed between the outer surface of the cylindrical portion in the first part of the respiratory apparatus and the inner surface of the cylindrical attachment boss in the filter.
  • a cylindrical portion in that part of the respiratory apparatus to which the filter is attached, and when the filter is being attached this portion pushes inside the threaded boss of the filter.
  • That filter part which, according to prior art, is threaded, is referred to below generally as an attachment boss.
  • an attachment boss Between the outer surface of the cylindrical portion and the inner surface of the attachment boss of the filter it is possible to form a sealing zone by placing between the surfaces, for example, an O-ring of an elastic material, known per se. The closer the sealing zone thus formed is to the outer end of the cylindrical portion, the less the tightness of the arrangement is sensitive to whether or not the filter has been screwed properly in place.
  • the invention does not exclude the possibility of the attachment arrangement also having a prior art seal: double sealing will further improve the safety in use of the product.
  • the invention is highly applicable to a modular blower part which has a separate blower module to which it is possible to connect, according to need, suction duct modules of different shapes and sizes, to which modules it is further possible to connect a suitable number of filters.
  • a filter is connected by the arrangement according to the invention directly to a cylindrical portion in the blower module.
  • the suction duct module may in this case be a simple support part which does not have an actual suction duct but which merely supports the joint between the filter and the blower module.
  • Figure 3a shows as a partial cross-section a filter 301 and another part 302 of the respiratory apparatus, which part may be, for example the suction duct module of a modular blower part.
  • the filter has an attachment boss 303, the outer surface of which has, in this embodiment of the invention, a male thread 304 defined by the DIN 3182 standard, in itself in accordance with prior art.
  • the wall of the recess in part 302 has a corresponding female thread 305.
  • Part 302 also has a cylindrical portion 306, which is coaxial with thread 305, in which case, when the filter 301 has been screwed into place, the cylindrical portion 306 extends inside the attachment boss 303 of the filter.
  • a groove 307 in which there is placed a sealing ring, in itself in accordance with prior art, for example an O-ring 308, made of an elastic material.
  • the depth of the groove 307 is smaller than the thickness of the O-ring 308, and thus, when the O-ring 308 is in the groove 307, its outer surface projects somewhat from the outer surface of the cylindrical portion.
  • the outer diameter of the cylindrical portion 306 is to such an extent smaller than the inner diameter of the attachment boss 303 of the filter that the cylindrical portion fits well inside the attachment boss; however, the thickness of the O-ring is great enough to cause the inner surface of the attachment boss of the filter to press tightly against the O-ring, whereby a tight joint is formed between the inner surface of the attachment boss 303 and the outer surface of the cylindrical portion 306.
  • Figure 3a shows that the tightness of the joint between the filter 301 and the part 302 is not too sensitive to whether or not the filter has been screwed properly in place. If the inner surface of the attachment boss 303 of the filter has substantially the shape of a straight circular cylinder, the filter can be unscrewed (the filter moving upwards relative to the position in the figure) until the outer end of the attachment boss 303 is at the level of the O-ring 308 without the tightness of the joint suffering therefrom. The closer the groove 307 is to the outer end (in the figure, the upwardly pointing end) of the cylindrical portion 306, the further the filter can be unscrewed without the joint beginning to leak.
  • Figure 3b shows as a partial cross-section another embodiment of the invention, which is otherwise similar to the embodiment of Figure 3a, but in which there is additionally used a sealing ring 320 in itself in accordance with prior art.
  • the inner end (in the figure, the lower end) of the female thread 305 comprised by part 302 has a flat surface 321 against which the sealing ring 320 is placed.
  • Figure 4 shows as a partial cross-section a modular blower part 400, which is made up of a blower module 401, a suction duct module 402, and filters 403 and 404.
  • the suction duct module 402 is attached to the blower module 401 by the blower module being pushed partly inside the cylindrical connection portion 405 in the suction duct module and by a band 406 being tightened around the connection portion 405 and the blower module portion inside it.
  • the connection portion 405, the band 406 and the outer surface of the blower module 401 may have a hole for the hose leading to the face mask of the respiratory apparatus; for the sake of clarity, the hose and the hole are not shown in the figure.
  • connection portion 405 it is also possible to form an attachment point for the hose at a point in the blower module which will not come inside the connection portion 405, in which case the connection portion 405 and the band 406 need not have a hole for it.
  • the blower module 401 and the suction duct module 402 have been attached to each other, the cylindrical portion 407 in the blower module has been pushed inside the suction duct 408 in the suction duct module.
  • the tightness of can, when so desired, be improved by placing in the groove 409 encircling the outer surface of the cylindrical portion 407 an O-ring 410 made of an elastic material.
  • the suction duct module 402 has attachment sites for two filters 403 and 404.
  • the filter 403 and the seals used for attaching it are shown detached, and the filter 404 and the seals used for attaching it are shown attached.
  • the structure of the attachment sites is similar to that in Figure 3b, i.e. each attachment site has a female thread into which the male thread of the attachment boss of the filter fits, and a cylindrical portion which will extend inside the attachment boss of the filter when the filter is screwed in place, an O-ring 411, 412 having been placed in the groove encircling the outer surface of the cylindrical portion.
  • the joints between the suction duct module 402 and the filters 403 and 404 are sealed by the O-ring 411, 412 and additionally - when the filters are properly screwed in place - by the prior-art sealing ring 413, 414.
  • Figure 5 shows as a partial cross-section the attachment of a filter 403, in the manner according to the invention, directly to the blower module 401.
  • the attachment boss 303 of the filter 403 is simply pushed over the cylindrical portion 407 in the blower module 401, whereupon the O-ring 410 placed in the groove 409 encircling the outer surface of the cylindrical portion 407 will seal the joint between the filter and the blower module.
  • the purpose of the cylindrical portion 407 is to direct air to the impeller or corresponding pumping means which is in the blower module and which, rotated by an electric motor, pumps the air to the face mask of the respiratory apparatus.
  • the arrangement additionally includes a support part 501, which has a female thread 502 fitting the male thread of the attachment boss of the filter, and which can be attached to the blower module 401 by an arrangement based on a tightening band 406, similar to that described above in connection with Figure 4 with reference to the attachment of the suction duct module 402 to the blower part 401.
  • FIG. 6 shows how a prior art sealing ring 320 is added to an arrangement in which the filter is directly connected to the blower module.
  • the frame material of filters is most commonly injection-molded polypropylene.
  • the frame material of the blower module is most commonly fiberglass-reinforced injection-molded polypropylene.
  • the suction duct module may be of some more resilient material, such as polyurethane, which has been shaped, for example, by casting. Advantages derived from the selection of the materials are described, for example, in the same applicant's Finnish patent application number 972931.
  • the DIN 3182 standard requires that the thread by which the filter is attached to some other part of the respiratory apparatus meets, among others, certain rigidity requirements.
  • an insert comprising the threads, which insert is made, for example, of injection-molded polypropylene.
  • the sealing in the attachment of the filter is not dependent on the rigidity of the thread, and thus the use of inserts can, at least in part, be forgone.
  • the support part 501 may in its entirety be made of polyurethane.
  • Plastic parts manufactured entirely of the same material are advantageous in terms of both the manufacturing techniques and recyclability.
  • the invention does not presuppose that the inner surface of the attachment boss of the filter have the shape of a straight circular cylinder; it may be slightly conical so that the inner diameter of the attachment boss is at its maximum at the outermost end of the attachment boss and decreases towards the inner end of the attachment boss.
  • the advantageous features of the invention will be lost, since an attachment boss having a conical inner surface becomes sealed against an O-ring on the surface of the cylindrical portion, coming inside it, in the best possible manner only when the filter has been screwed properly in place.
  • the cylindrical portion which, when the filter is being attached, pushes inside the attachment boss of the filter may have a shape other than cylindrical; the invention presupposes only that a sufficiently large proportion of it fits inside the attachment boss of the filter so that the sealing zone can be formed.
  • the said cylindrical portion is called cylindrical only so that it would have a certain consistent and unambiguous name.
  • the invention does not presuppose that the outer surface of the attachment boss of the filter have a thread according to the DIN 3182 standard, or that the outer surface of the attachment boss have any thread, but since filter manufacturing lines are typically equipped to form a thread on the outer surface of the attachment boss of a filter, it is advantageous in terms of manufacturing techniques that the arrangement according to the invention allows the presence of a thread similar to that in prior art arrangements.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
EP19980660114 1997-11-04 1998-11-04 Procédé et agencement pour fixer un moyen de filtration à un appareil respiratoire Expired - Lifetime EP0916369B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI974123A FI117161B (fi) 1997-11-04 1997-11-04 Menetelmä ja järjestely suodattimen kiinnittämiseksi hengityslaitteeseen
FI974123 1997-11-04

Publications (3)

Publication Number Publication Date
EP0916369A2 true EP0916369A2 (fr) 1999-05-19
EP0916369A3 EP0916369A3 (fr) 2001-05-09
EP0916369B1 EP0916369B1 (fr) 2012-01-18

Family

ID=8549856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980660114 Expired - Lifetime EP0916369B1 (fr) 1997-11-04 1998-11-04 Procédé et agencement pour fixer un moyen de filtration à un appareil respiratoire

Country Status (2)

Country Link
EP (1) EP0916369B1 (fr)
FI (1) FI117161B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003041801A1 (fr) * 2001-11-15 2003-05-22 Cl.Com S.R.L. Systeme de filtrage assurant une protection contre les agents biologiques
WO2011051715A3 (fr) * 2009-11-02 2011-08-18 Scott Health & Safety Ltd. Améliorations d'un appareil respiratoire à adduction d'air

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR095434A1 (es) 2013-03-15 2015-10-14 Scott Tech Inc Interfaz de filtro de respirador

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748953C (de) * 1940-05-17 1945-01-10 Vorrichtung zum wahlweisen Anschluss von Filtern oder Sauerstoffatemgeraeten an das Anschlussstueck von Gasschutzmasken
EP0065754A1 (fr) * 1981-05-21 1982-12-01 Auergesellschaft Gmbh Liaison enfichable pour la jonction détachable d'éléments de raccordement aux appareils respiratoires
EP0090083A2 (fr) * 1982-03-31 1983-10-05 Drägerwerk Aktiengesellschaft Raccord rapide d'appareillage à des masques respiratoires
FR2537695A1 (fr) * 1982-12-10 1984-06-15 Commeinhes Protection Raccord encliquetable et appareil respiratoire ainsi equipe
EP0394139A1 (fr) * 1989-04-21 1990-10-24 Comasec International Raccord intermédiaire pour embout d'appareil respiratoire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748953C (de) * 1940-05-17 1945-01-10 Vorrichtung zum wahlweisen Anschluss von Filtern oder Sauerstoffatemgeraeten an das Anschlussstueck von Gasschutzmasken
EP0065754A1 (fr) * 1981-05-21 1982-12-01 Auergesellschaft Gmbh Liaison enfichable pour la jonction détachable d'éléments de raccordement aux appareils respiratoires
EP0090083A2 (fr) * 1982-03-31 1983-10-05 Drägerwerk Aktiengesellschaft Raccord rapide d'appareillage à des masques respiratoires
FR2537695A1 (fr) * 1982-12-10 1984-06-15 Commeinhes Protection Raccord encliquetable et appareil respiratoire ainsi equipe
EP0394139A1 (fr) * 1989-04-21 1990-10-24 Comasec International Raccord intermédiaire pour embout d'appareil respiratoire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003041801A1 (fr) * 2001-11-15 2003-05-22 Cl.Com S.R.L. Systeme de filtrage assurant une protection contre les agents biologiques
WO2011051715A3 (fr) * 2009-11-02 2011-08-18 Scott Health & Safety Ltd. Améliorations d'un appareil respiratoire à adduction d'air
CN102740931A (zh) * 2009-11-02 2012-10-17 斯科特健康及安全有限公司 对电动空气呼吸装置的改进
CN102740931B (zh) * 2009-11-02 2015-08-19 斯科特健康及安全有限公司 对电动空气呼吸装置的改进
US9387299B2 (en) 2009-11-02 2016-07-12 Scott Health & Safety Ltd. Improvements to powered air breathing apparatus
US10668307B2 (en) 2009-11-02 2020-06-02 Scott Health & Safety Ltd. Breathing apparatus
US10695592B2 (en) 2009-11-02 2020-06-30 3M Innovative Properties Company Powered air breathing apparatus
US11707638B2 (en) 2009-11-02 2023-07-25 3M Innovative Properties Company Powered air breathing apparatus

Also Published As

Publication number Publication date
EP0916369A3 (fr) 2001-05-09
FI974123A (fi) 1999-05-05
FI974123A0 (fi) 1997-11-04
EP0916369B1 (fr) 2012-01-18
FI117161B (fi) 2006-07-14

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