Improvements in apparatus for respiring in foul air / [Alexander Bernhard Dräger].

  • Dräger, Alexander Bernhard.
Date:
1901
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in apparatus for respiring in foul air / [Alexander Bernhard Dräger]. Source: Wellcome Collection.

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    N° 20,558 A.D. 1901 Date of Application, 14th Oct., 1901—-Accepted, 23rti Nov., 1901 COMPLETE SPECIFICATION. Improvements in Apparatus for Respiring in Foul Air. We, Alexander Bernhard Drager of Moislinger Alice, 53, Ltibeck, Engineer, and Doctor Ludwig Miciiaelis of Tegeler Strasse 15 Berlin, Manager, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the 5 following statement. Our invention relates to improvements in apparatus for respiring in foul air, and the objects of the improvements are first to provide a sufficient supply of fresh air or oxygen for renewing the air inside the breathing mask or helmet; second to dispense with any far leading pipes or hoses for introducing the oxygen 10 gas or fresh air; third to free the air inside the apparatus) of the carbonic acid; fourth to produce a continuous circulation of the air inside the apparatus from the reservoir wherein the air is exhausted from the mouth and nose of the person protected by the apparatus through a regenerating device ; fifth to facili¬ tate breathing inside the apparatus; and sixth to keep the transparent part of 15 the mask or helmet free from moisture. We obtain these objects by the apparatus shown in the accompanying drawings in which: — Figure 1 is a back view of a person provided with our improved apparatus, and 20 Figure 2, is a front view of the same : Figures 3, 4 5 and 6 are detailed views of the respiring mask or helmet on a larger scale, Figure 3 being the front elevation, Figure 4 the side elevation, Figure 5 the top view and Figure 6 the back view; Figure 7 is a sectional side elevation of the nozzle for mixing compressed 25 oxygen or air with the air leaving the regenerating device. Similar letters refer to similar parts throughout the several views. Our improved apparatus is especially suited for protecting firemen, miners and other persons who, in case of accidents, have to enter and to remain in rooms or in mines where the air is irrespirable by smoke or gas. The principal .30 features of the apparatusi are a reservoir containing' a supply of compressed air or oxygen gas which is fastened to the man’s body by means of a bearing device, a mask or helmet which protects the man’s respiratory organs, (nose and mouth), and which is provided with an impermeable bag for the reception of the ex¬ hausted air as well as of the regenerated air, and a regenerator supplied with 35 chemicals which retain the expired carbonic acid. The mask or helmet A kept in proper position on the head by means of a strap a is composed of an oval ring a2 and a projection a1 provided with mica or glass plates a3. To tighten the ring a2 round the man’s head and face we make use of a rubber hose a4, such as employed in bicycle tyres, which is blown 40 up by means of a tube a5 attached in convenient position for the mouth and connected with the tightening hose a4 by the tube a6 and screw valve a7. A bow a8 is hinged at both sides to the projection a1 and supports a bag a9 made of impermeable material. This bagv a9 serves to receive the products of breath¬ ing and also the purified air. The latter is introduced by the tube b attached 45 at the one end to the branch c of the injecting nozzle C, while the other end is fastened to the nose nozzle bl of the pipe b2. The pipe b2 pierced with small [Price 8c?.]