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
  • A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
  • A62B18/084—Means for fastening gas-masks to heads or helmets
• • 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
  • A62B18/003—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 having means for creating a fresh air curtain

Definitions

• the present invention refers to a respiratory mask, i.e. a device which has for its purpose to prevent inhalation of air which by some reason is estimated to be unsuitable to inhale for instance by containing poisonous gases such as welding fumes, exhaust gas from internal combustion engines and the like but also by containing pollen or other stuffs which can provoce undesired reactions to allergies.
• a respiratory mask i.e. a device which has for its purpose to prevent inhalation of air which by some reason is estimated to be unsuitable to inhale for instance by containing poisonous gases such as welding fumes, exhaust gas from internal combustion engines and the like but also by containing pollen or other stuffs which can provoce undesired reactions to allergies.
• respiratory masks may be divided into two main groups namely passive ones, which substantially comprise a hood which sealingly surrounds at least the respiratory organs and comprise a filter through which respiration takes place, and active ones, by which a filtered air stream generated by a fan is directed towards the face of the user.
• Respiratory masks of the first cathegory may in most cases only be used short times due to the big breathing resistance caused by the filter.
• Respiratory masks of the second cathegory are usually so designed that they need stationary devices for generating the necessary pressurized air and the air streams cause draught in the eyes of the user.
• the majority of the respiratory masks are further such designed that they give the user a sense to being locked up and prevent in most cases speaking communication between the user and his neighbourhood.
• the object of the invention thus has primarily been to provide a more universal respiratory mask which is not encumbered with the above-mentioned deficiencies and which further may be produced at a reasonably low cost and with such dimensions and such weight that it withoutdifficulty or discomfort may be used during long periods of time and thereby give the user an effective protection against the harmful or disagreeable materials contained in the air at the same time as it eliminates the feeling of being locked up and offers a possibility to speek freely to persons in his enviroment.
• the invention has the characteristics of the patent claims.
• Fig. 1 is a side view partly in section of a respiratory mask according to the invention.
• Fig. 2 is a section taken along line II-II in fig. 1.
• the respiratory mask illustrated in the drawing which has been given the general designation 1 comprises a container or cover 2 having the upper end thereof open and having a substantially vertical front wall 3 which as appears from fig. 1 in the position of use is situated in front of a vertical plane through the foremost part of the users nose.
• the front wall 3 continues in side walls 4a, 4b which are shaped in such a way 4a',4b' that they contact the cheeks at least by the inner portions thereof by means of internal sealings.
• the front wall 3 continues via a rounded transition in a bottom wall 5, which in the illustrated embodiment is inclined and ends in a combined sealing portion and pressure chamber, which in the illustrated erribodimend has the shape of a hose made from a soft and flexible material such as softended plastic rubber or the like and which is intended to be applied against that portion of the users chin which is situated just below the under lip.
• the hose is further shaped in accordance with the user's face such that it seals against the portion just below the under lip as well as against the corresponding portions of the cheeks.
• a chin-strap 7 a neck-strap 8 and a bow 9 for each ear.
• the straps 7 and 8 may in a manner known per se be adjustable as to their length or resilient and the bows are in the illustrated embodiment axially resilient.
• the hose 6 which for instance by a corrugated and thereby particularly resilient hose 10 leads to a pressurized air source is in the opposite end thereof completely or partly closed by means of a plug 11 (see fig. 2).
• the hose 6 has in the part thereof which is located inside the cover 2 a plurality of holes 12,13 serving as nozzles, from which a first series 12 are directed towards the front wall 3 and a second series 13 are directed substantially upwardly towards the nose of the user.
• the hose or the pressurized air source preferably has a filter.
• the air jet streams coming from the hose 6 which acts as an air channel and which streams by means of the nozzle holes 12 are directed to- wards the front wall 3 hit the front wall and are deflected from this one such that they form substantially upwardly directed air streams and owing to the fact that the cover is closed downardly and at the sides there is generated an upwardly directed air seal in front of the nostrils and said air seal locks out the ambient air and unites with the air jet streams which via the openings 13 are directed towards the nostrils.
• the cover 2 Since the cover 2 only is open upwardly intake of polluted ambient air by ejector function is prevented and the required amount of air is minimized and the speed of the air may be held low.
• the dimension of the nozzle openings and the direction thereof may of course be varied such that the stream conditions most suitable for the specific use may be obtained. Owing to the moderate required amount of air the supply or air can be obtained by means of a small battery powered fan which makes it possible for the user to carry it for instance in a bag or by means of a harness. Since the cover has an open upper end the respirator mask will not be felt as fencing and the user may communicate with his surroundings without difficulty. In the illustrated embodiment the upper end portion of the cover 2 is in the same level as the nostrils of the user but the cover may of course be higher and in certain instances also lower.
• the respiratory mask now described may successfully be used by allergies and in those cases when it is used by women there can be secured to the cover a covering veil 15 to make the product as discreet as possible.
• a finely meshed net 14 or a perforated plastics sheet may be secured a little bit above the nozzle mouths and as appears from fig. 1 such a net can reach the wall 3 with one part 14' thereof.

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20369189

Family Applications (1)

Country Status (7)

Cited By (9)

Families Citing this family (48)

Citations (4)

Family Cites Families (13)

• 1987
  • 1987-07-28 SE SE8702983A patent/SE457234B/sv not_active IP Right Cessation
• 1988
  • 1988-07-14 EP EP88906842A patent/EP0368916B1/en not_active Expired - Lifetime
  • 1988-07-14 AU AU22507/88A patent/AU2250788A/en not_active Abandoned
  • 1988-07-14 JP JP63506594A patent/JP2690342B2/ja not_active Expired - Lifetime
  • 1988-07-14 DE DE3888838T patent/DE3888838T2/de not_active Expired - Fee Related
  • 1988-07-14 WO PCT/SE1988/000380 patent/WO1989000874A1/en active IP Right Grant
  • 1988-07-14 US US07/460,182 patent/US5048516A/en not_active Expired - Fee Related

Patent Citations (4)

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