Breathing mask

US4974586A · kind A · utility

Assignee

• Moldex/Metric Products, Inc. · US

Inventors

• Heinz Wandel · Neckartenzlingen, DE
• Martin Skov · Neckartenzlingen, DE

Key dates

• Filing date: Oct 6, 1988
• Grant date: Dec 4, 1990
• Expiry date: Oct 6, 2008

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A62B23/02
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A breathing mask is provided which comprises an exhaling valve disposed in an opening of the breathing mask wall. The exhaling valve includes a thin diaphragm which is adapted to be moved by the breathing pressure during inhaling and exhaling either towards or away from a sealing seat. To provide a less expensive breathing mask whose exhaling valve safely closes in particular in dust-particle-containing air and which nevertheless involves low opening and closing pressures, the diaphragm is provided with an arch. Air is allowed to escape over only a part of the circumference of the diaphragm, while the remaining part of the diaphragm circumference is so connected to a base member that the arching direction of the arch is at least partly reversible by the breathing pressure.