Gas mask for normal pressure operation and overpressure operation

US7575004B2 · kind B2 · utility

Assignee

• DRÄGER SAFETY AG & CO. KGAA · DE

Inventors

• Rüdiger Weich · Ribnitz-Damgarten, DE
• Thomas Grassl · Freising, DE
• Rüdiger Müller · Stockelsdorf, DE
• Manfred Gdulla · Wulfen, DE
• Siegbert Tolk · Lübeck, DE
• Olaf Balke · Reinfeld, DE

Key dates

• Filing date: Aug 2, 2005
• Grant date: Aug 18, 2009
• Expiry date: Aug 18, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16K15/142
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A gas mask for normal pressure operation and overpressure operation allows changeover of the expiration valve (4) from normal pressure operation to overpressure operation is made possible in a simple manner. The pretension of the valve spring (7) of the expiration valve (4) is adjusted by an angle lever (10) pivotable about an axis of rotation (13).