Dragerwerk Aktiengesellschaft

Draegerwerk, Ag

Carl E Van Der Smissen

Wolfgang Eckstein

Rainer Ernst

Holmer Rohling

Hans-Joachim Walther

Herbert Rohl

Horst Wezurek

Kai Vom Hofe

An impregnation for respirator filters, filled with active carbon, containing at least two of the known vanadium, copper, manganese, and zinc compounds, which occur as the vanadate, oxide, carbonate, or chloride, with addition of an oxo acid, shall be improved such that the stability of the respirator filters during storage will be improved. To accomplish this task, tungstic acid, molybdic acid, permanganic acid, stannic acid, or phosphoric acid is added.

Impregnation for respirator filters filled with active carbon

A respirator with blower support for the flow through at least two filters in the breathing gas lead is provided such that the flow of one of the filters temporarily is in the inhalation direction and the other flow is in the exhalation direction respectively and their flow through direction is periodically reversible. This allows flow through of the filter in small volumes without a premature bursting or filter depletion. The wearer comfort should remain and the blower support is not diminished in its operation.

Respirator with blower support and regeneration of the breathing filter

The prior-art CO.sub.2 adsorbent masses used in oxygen-supplying respirators have the disadvantage that they can be granulated only very poorly. The granules have low strength and a tendency to dusting. The goal of the present invention is to produce harder granules which do not give rise to dusting any longer. This is achieved according to the present invention by adding an alkali salt of an oxo acid, preferably sodium hexametaphosphate, to the calcium hydroxide paste prior to the granulation. The present invention is not limited to this salt, but it is also possible to use alkali salts or other oxo acids, such as orthophosphoric acid, sulfuric acid, hypermanganic acid, chromic acid, and vanadic acid. This leads to a substantial increase in the strength to the calcium hydroxide granules without any reduction of their CO.sub.2 binding capacity.

CO.sub.2 adsorbent mass

A chemical oxygen generator for use in respirators and resuscitators for providing an oxygen reserve includes oxygen in chemically bound compacts or oxygen single-candles and the oxygen is released when needed in the course of a chemical reaction. The oxygen single candles are fitted together axially in a canister in modular construction with incandescence elements therebetween. In the cover of the canister, opposite the upper end wall of the first single candle, there is an igniting device, and in the bottom, an outlet opening for the escape of the released oxygen. As soon as the first oxygen single-candle is activated by means of the igniting device, the oxygen reaction sets in and a reaction front moves in the direction of the next single candle. The reaction transmission to the next single candle occurs through the intermediate incandescence element. By their broad abutment on the single candles to be connected by them, and by their material consistency, the incandescence elements provide shockproofness necessary for the burnoff of the single candle.

Chemical oxygen generator

The invention is directed to a protective hood for an emergency which is formed in part by a permeable strip-like piece holding back dust-like harmful substances. At least in the region of the eyes, the protective hood has a section made of transparent material and the hood also includes an inner half-mask with a breathing air inlet and an exhalation valve. The protective hood is improved by reducing the resistance to inhalation and expanding the protection against harmful gaseous components. This protection is achieved in that the strip-like piece is made of a nonwoven fabric which is provided with a preparation holding back also gaseous harmful substances and includes a breathing air inlet in the form of an inhalation valve for admitting breathing air.

Protective hood

An igniting mixture is provided for chemical oxygen generators used in respirators and resuscitators for making an oxygen supply available. In chemical oxygen generators the oxygen is present in chemically bound form and when needed is released in the course of a chemical reaction with the triggering of an ignition. The ignition device with an igniting mixture is normally contained in the upper part of the chemical oxygen supply present in candle form. From here, then, begins the reaction after the ignition. To ensure the storability of the oxygen generators, the igniting mixture remains thermally stable up to a temperature of 100.degree. C., but can be activated by water and also by a higher temperature. The igniting composition consists of a mixture of an alkali and metal oxygen compound selectively with an oxygen containing silicon compound, percarbonate, metal peroxide or superoxide.

Growing community of inventors

Lubeck, Germany

Carl E Van Der Smissen