Closed cycle respirator with emergency oxygen supply

US4423723A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Jo/ rg Winkler · Stockelsdorf, DE
• Hans Matthiessen · Bad Schwartau, DE
• Ernst Warncke
• Adalbert Pasternack · Bad Schwartau, DE

Key dates

• Filing date: Mar 11, 1982
• Grant date: Jan 3, 1984
• Expiry date: Mar 11, 2002

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B63C11/24
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A closed cycle respirator with emergency oxygen supply is disclosed which comprises a main oxygen flow path from an oxygen bottle into a breathing bag of the closed breathing cycle. A switching valve is provided in the first path and branches off into a second path also for supplying oxygen into the bag. The first oxygen flow path has a solenoid valve therein which is controlled by a first oxygen sensor in the breathing bag. The switching valve is controlled by a second oxygen sensor in the breathing bag for switching oxygen supply over to the second flow path in case the solenoid valve malfunctions or anytime the oxygen in the bag falls below or rises above a set desired limit.