Patent · US Active

Gas mask

US8631794B2 · kind B2 · utility

1Cited by

8References

20Claims

0Family size

Assignee

DRÄGER SAFETY AG & CO. KGAA · DE

Inventors

Alexander Busch · Wulfen, DE
Dirk Feil · Wulfen, DE

Key dates

Filing date	Feb 2, 2011
Grant date	Jan 21, 2014
Priority date	—
Expiry date	Oct 24, 2031

Classification

Technology area (CPC A)Human Necessities
CPC primaryA62B18/10
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A gas mask is provided for normal-pressure and overpressure operation with at least one breathing port, an expiration valve with a valve spring, an adjusting element affecting the prestress of the valve spring and a pushing element having a first switching position and a second switching position. The pushing element is designed to act on the adjusting element during a translatory motion from the first switching position into the second switching position. A change in the prestress of the valve spring can be brought about and a switchover from a “normal pressure” mode into an “overpressure” mode can thus be carried out.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.