Electrically and mechanically controllable closed cycle respirator

US4440166A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Jörg Winkler · Ullersdorf, DE
• Hans Matthiessen · Bad Schwartau, DE
• Ernst Warncke
• Adalbert Pasternack · Bad Schwartau, DE

Key dates

• Filing date: Mar 11, 1982
• Grant date: Apr 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 is disclosed which includes a respiration air cycle having a breathing bag and a carbon dioxide absorber with connecting lines between the breathing bag and absorber and to a junction adapted for use by the user of the equipment. A pressurized oxygen bottle is provided with a controllable valve for supplying oxygen to the cycle in case the oxygen drops below a selected value in the breathing bag. In case of failure of the controllable valve, a separate oxygen supply connection is provided to the breathing cycle with a valve which senses a reduction of pressure in the breathing cycle and opens the connection to the oxygen bottle for emergency supply of oxygen to the cycle.