초록 ▼

The alarm system of the present invention includes a pressurized air source for the purpose of pressurizing a face mask which surrounds the mouthpiece of respirator apparatus. An alarm indicating device is installed in the air line between the pressurized air source and the face mask. If the face ma

The alarm system of the present invention includes a pressurized air source for the purpose of pressurizing a face mask which surrounds the mouthpiece of respirator apparatus. An alarm indicating device is installed in the air line between the pressurized air source and the face mask. If the face mask is leaking air to outside the space enclosed by it, the alarm will indicate a continuous flow. If there is leakage from the space enclosed by the face mask into the mouthpiece, the alarm will indicate intermittent leakage since the placement of air will flow only during inhalation. The wearer of the apparatus may thus be confident that either no leakage is occurring or that there is leakage and that appropriate corrective measures should be taken.

대표청구항 ▼

Respirator apparatus for a person, comprising: a filter for purifying ambient air; means for directing purified air for inhalation by said person and for directing expired air from said person; first means for communicating the purified air from said filter to said directing means, said first commun

Respirator apparatus for a person, comprising: a filter for purifying ambient air; means for directing purified air for inhalation by said person and for directing expired air from said person; first means for communicating the purified air from said filter to said directing means, said first communicating means including first valve means for passing said purified air and preventing passage of said expired air; an outlet; second means for communicating the expired air from said directing means to said outlet, said second communicating means including second valve means for passing said expired air and preventing passage of incoming contamined air; a face mask for fitting against the face of said person and surrounding said directing means with respect to the face of said person, said face mask including means for sealing to said first and second communication means which extend through said face mask to said directing means; a pressurized air source; and third means for communicating the pressurized air from said source to said face mask, said third communicating means including alarm means for alerting said person that there is flow of pressurized air; whereby on being alerted said person may conclude there is leakage of pressurized air from said face mask.