US2114142A

US2114142A - Oxygen generating apparatus

Info

Publication number: US2114142A
Application number: US129822A
Authority: US
Inventors: Hloch Albert
Original assignee: IG Farbenindustrie AG
Current assignee: IG Farbenindustrie AG
Priority date: 1931-11-05
Filing date: 1937-03-09
Publication date: 1938-04-12
Anticipated expiration: 1955-04-12

Description

April 12, 1938. A. HLOCH 2,114,142

OXYGEN GENERATING APPARATUS Filed March 9, 1937 lnvenfor A Zbe rt Hive/2,

By His Affomeys Patented Apr. 12, 1938 UNiTED STATES PATENT OFFICE OXYGEN GENERATING APPARATUS Application March 9,

1937, Serial No. 129,822

In Germany November 5, 1931 3 Claims.

This invention relates to apparatus for generating oxygen by thermal decomposition of oxygen-liberating compositions, more particularly for use in connection with rescue apparatus.

In such known oxygen-generating apparatus, the oxygen-generating mixture of chemical substances, consisting for example predominantly of chlorate and/or perchlorate, is generally employed in the form of a shaped compressed body disposed in a sheet metal container which is provided with an ignition device.

The present invention aims at providing an ignition device for such oxygen-generating apparatus which is simple in construction and operation, which will not transmit sparks to the outside and which is suiiiciently rigid to withstand the high pressure of the ignition gases and the thermal stresses set up by the exothermic reaction by which the oxygen is liberated.

The device of the present invention is particularly intended for use in conjunction with oxygen-generating apparatus of the foregoing type, in which the shaped body of oxygen-gencrating composition is snugly disposed in a cartridge casing and held firmly and secure against shock by means of a heat insulating and filtering sheathing enclosing it on all sides, in the manner described in application Ser. No. 78,612, filed May 8th, 1936, and bearing the title Ap- 30 paratus for generating oxygen.

With the foregoing and other objects in view the present invention provides in oxygen-generating apparatus of the foregoing type, an ignition device comprising a rigid lid in which an ignition cap is inserted and which is secured to one end of the sheet metal cartridge containing the oxygen-generating composition, and a resilient cover for said lid.

In order that the invention may be more readily understood, reference is made to the accompany-- ing drawing which illustrates diagrammatically and by way of example two embodiments thereof and in which:-

Fig. 1 is a longitudinal section through one em- 45 bodiment; and

Fig. 2 a partial longitudinal section of a second embodiment.

In the embodiment shown in Fig. 1, the oxygengenerating composition B in the form of a compressed cylindrical body having a recess accommodating a primer B1 is inserted in a sheet metal container A with the primer B1 upwards, in such a way that it is surrounded on all sides by a sheathing K of heat-insulating and filtering filling material. At the lower end the filling material rests on a layer J of asbestos fibre, which in turn rests on a wire sieve H. The oxygen gen: erated passes through an outlet aperture G provided in the lid C.

The ignition device consists of a lid D1 which carries an ignition cap F and a domed attachment D3 secured thereto by rivets or the like and resting on the cylindrical body of oxygen-gencrating composition. By virtue of this arrangement the flame occurring during ignition is directed away from the walls of the sheet metal container A and towards the sheathing K. The lid D1 and the domed attachment D3 must be as rigid as possible in order to prevent yielding of the ignition cap F. Disposed above the ignition cap is a striking pin E which is guided by a guide E1 and on which lies a thin-walled resilient cover D2, which is preferably provided with grooves or the like to give extra resiliency. Said cover D2 serves as an additional seal to prevent the escape of gas when the ignition cap F is fired, but it must be sufliciently resilient to transmit a blow thereon to the striking pin E. The lid D1 and cover D2 are secured to the sheet metal casing A in a gastight manner, preferably by welding, e. g. spotwelding,

The apparatus is operated by striking the centre of the cover D2 with the aid of a striker, hammer or the like, the denting of the cover being favored by the grooves provided thereon. The striking pin B then ignites the ignition cap F, which latter in turn ignites the primer B1 disposed in the cylindrical body B, which thengencrates oxygen by thermal decomposition.

In order to avoid unintentional operation of the oxygen-generating apparatus by accidental striking of the cover D2, the striking pin E may be removably arranged as shown in Fig. 2, As shown in this figure, the striking pin E is screwed into a guide E1 in such a manner that it can be screwed back or removed entirely and screwed down until its point touches the ignition cap F only when required to be used. A conical packing (not shown) may be provided to seal the cover D2 in gas-tight manner.

I claim:-

1. An ignition device for oxygen-generating apparatus of the type in which chemical substances generating oxygen by thermal decomposition are employed in the form of a shaped body disposed in a container, said ignition device comprising an ignition cap and striking means adapted to coact therewith, a rigid lid closing said container and having said ignition cap disposed therein, a dome-shaped member secured to the' inside of said lid and adapted to repose with its rim on said shaped body disposed in said container, and a resilient cover for said lid held by the Walls of said container and adapted, on be ing struck, to cause actuation of said striking means.

2. An ignition device for oxygen-generating apparatus of the type in which chemical substances generating oxygen by thermal decomposition are employed in the form of a shaped body disposed in a container, said ignition device comprising an ignition cap and a striking pin adapted to coact therewith, a rigid lid closing said container and having said ignition cap being disposed therein, a dome-shaped member secured to the inside of said lid and adapted to repose With its rim on said shaped body disposed in said container, and a resilient cover for said lid held by the Walls of said container and adapted, on being struck, to

cause actuation of said striking pin, said striking pin being removably disposed in said resilient cover.

3. An ignition device for oxygen-generating apparatus of the type in which chemical substances generating oxygen by thermal decomposition are employed in the form of a shaped body disposed in a container, said ignition device comprising an ignition cap and a striking pin adapted to coact therewith, a rigid lid closing said container and having said ignition cap disposed therein, a domeshaped member secured to the inside of said lid and adapted to repose with its rim on said shaped body disposed in said container, and a resilient cover for said lid held by the Walls of said c0ntainer and adapted, on being struck, to cause actuation of said striking pin.

ALBERT HLOCH.