US1807399A - Dry fire extinguisher - Google Patents

Description

May 26, `1931. w. FRIEDRICH 1,807,399:

DRY FIRE EXTINGUISHER Fued Apri1 11, 1928 BY Mv.

ATTORNEY Patented Mayv 26, 1931 UNITED STATES' PATENT ori-lcs DRY FIRE EXTINGUIBHEB.

Application led April 11,.1928, Serial No. 269,252, and in Austria lay 27, 1927.

Dry fire extinguisher are already known in which the receptacle holding the gas for ejecting the extinguishing powder is contained in a cage or the like arranged within a closed container for the said extinguishing powder. The disadvantage of these apparatuses, however, is that the pressure gas passes freely into the extinguishing powder container and consequently there is no distribution of the said gas inside the powder container due to the choking of the distribution piping which is open at the top and bottom, and that the extinguishing powder causes the gas to follow the line of least resistance through the column of powder in the powder container instead of irst passing through the distribution piping.

The distribution of gas throughout the powder container by means of pipes in direct communication with the gas container is, however, desirable as by means of such distribution the extinguishing powder in the container is thoroughly agitated and effectively mixed With the gas and is ejected from the container in the form of a cloud of powder.

In the known apparatuses fitted with distribution piping, the bottle is arranged either on the outside of the container or a special chamber is provided in which the gas bottle is placed and to which 'the distribution piping 1s connected. The cost of constructing the latter form of `device is high and requires the provision of at least two sealing openings in the container; increases the weight and dimensions of the device and requires an excessive pressure in the chamber containing the carbonio acid. Thus said chamber must be of strong construction and special provision must be made to prevent the bursting of the said bottle.

The present invention has for its object a dry fire extinguisher in which the gas bottle is arranged inside the powder container in a cage or the like in the usual manner but has only one set of distribution piping. In accordance with the invention, a connection is formed between the gas bottle and the gas distribution piping. This connection is effected by means of a seal or cover placed on a single inlet opening in the owdcr container, through which opening t e gas bottle is filled and the extingulshing powder introduced. For this purpose and 1n accordance with the invention, the cover is formed in such a way that it provides a passage between the gas outlet opening in the bottle'an'd the distribution pipmg.

A form of dry fire extinguishing apparatus embodying the present invention is shown on the attached drawing in which Fig. 1 shows a side view of the apparatus with the upper portion in section.

Fig. 2 is a longitudinal section through the seal and the up er portion of the gas bottle on a larger sca e.

Fig. 3 is a cross section on the line III- III in Fig. 2.

Within the .container 1 which holds the extinguishing powder and is fitted with a discharge nozzle 2, are arranged the gas bottle 3 and the gas distributor piping 4. In the present instance this piping comprises an upper pipe 4 from which branch a number of pipes 5, said pipes extending along the walls of the powder container and being of different length or stepped and having their lower ends all turned in the same direc-tion. One of the pipes 5 is preferably arranged with its discharge end in the nozzle 2.

The gas bottle 3 is contained within a cage composed of four or more rods 6 6 with the neck 7 of the bottle uppermost. In the neck 7 is located a sealing plug 7 a bored to receive screwed plug or stopper 8. By turning the plug 8 an outlet opening 9 in the plug 7 a of the gas bottle can be closed or opened at will. When the stopper 8 is open, the gas escapes upwards, through a channel 10 arranged in the stopper, and into the hollow space 11 below the cover 13. This space in the cover is closed at the lower end by means of a piston 12 between whichand the inner surface of the annular wall 14 of the cover or closure 13 an airtight joint is formed by means o packing 14a secured to the piston 12. Preferably, the piston 12 is pressed downwards by means of a spring 17. An annular sprlng 18 arranged adjacent the lower end 14 of the cover 13, and acts as a stop to-prevent'the 100 piston 12 falling out when the cover 13 is taken oi. The cover is arranged so as to screw into the ring 19 secured in the opening of the container. The up r portion of the thread inthe cover 13 andxin the neck ring 19 is cut away-so as to provide an annular space 20. This space forms a connection between the space 11 in the cover 13 and the distribution piping connected thereto by means of a curved conduit 21 located at the top of the ring 19.

The wall 14 of the cover 13 is provided at the top with openings 22 which connect the inner space 11 to the annular space 20. In this way, when the cover is screwed in, connection is established between the inside of the carbonic acid bottle and the gas distributing piping 4. As the gas flowing out of the gas bottle through the channel 10 1n the stopper 8 passes into the hollow space 1 1 1n the cover 13 itpasses throu h the openlngs 22 inthe cover into the annu ar space 20 and enters theA distribution pi es 4-5 through the-curved conduit 21. n this way it is ossible to employ distribution piping that directlytakes the gas, at the same time retaining the 'gas bottle which is inserted directly into the powder container.

' Should gas escape through the thread by means of which the cover 13 is screwed into the ring 19 the eiciency of the device will not be affected as the gas iows into the inslde of the powder container, and cannot escape into the. atmosphere. The quantity of gas escaping through the thread is Very small and has no detrimental influence on the action of the apparatus. The escape of gas at the point of contact of cover 13 with the ring 19 is prevented by packing 23.

The stopper 8 of the gas bottle is operated by a key 24 which can be rotated by means of an externally accessible hand-wheel 25.

Instead of the stepped arrangement of this distribution piping, any other arrangement of the said piping can be employed.

The purpose of'the distribution piping is to loosen the extinguishing powder at the wall of the owder container and to bring about a mixing and thorough dispersion of the powder at the lower end of the container.

I claim y 4 1. In a re extinguisher having a discharge outlet, a powder container, a gas bottle supported therein having its outlet normally sealed, means for rendering ineffective said sealing means, a closure for the powder container having a chamber therein, means for rendering said chamber Huid tight, means for establishing communication between said gas bottle and said chamber, a conduit arranged within the powder container and having a communication with the chamber in the closure, and a plurality of branch conduits leading from the first named conduit to dierent points throughout the container and into sai discharge outlet. i

2. In a fire extinguisher having a discharge outlet a ported t erein havin its outlet normal y sealed, means for rendering ineective said sealing means, a closure for the powder container having .a chamber therein, means for renderin sald chamber fluid tight, means for estab ishing communication between said gas bottle and said chamber, a conduit arranged within the powder container and having communication with the chamber in the closure, and a plurality of, branch conduits leading from-the first named conduit, the branch conduits being dis sed in parallelism and extendin along t e walls to different points throng out the container and into said discharge outlet.

3. In a fire extinguisher having a discharge outlet a powder container, a closure normally sealin the upper end thereof and having a depen ing annular flange projecting into the container, a sealing piston in the annular flange and normally resiliently urged in a downwardly direction, a gas bottle supported in the container below the piston, a valve normally closing the gas bottle, and having an opening for establishing communication between the as bottle and inside diameter of the fiange a ove the piston, manually operable means carried by the closure for operating the valve, and a conduit arranged in the powder compartment and communicating with the inside diameter of the annular lange and a plurality of branch conduits leading from the said conduit to different points throughout the container and into said discharge outlet.

In testimony whereof I have affixed my signature.

WILHELM FRIEDRICH.

wder container, a gas bottle su

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