US1329831A - Fire-extinguisher - Google Patents

Description

E. M. E VLETH.

FIRE EXTINGUISHEH. APPLICATION FILED JUNE 8. I917.

Patented Feb. 3, 1920.

Invsni'or Earl flEvlciib 1 Z Wu. m

EARL M. EVLETH, OF ST. PAUL, MINNESOTA.

FIRE-EXTINGUISHER.

Specification of Letters Batent.

Patented Feb. 3, 1920.

Application filed June 8, 1917. Serial No.' 173,486.

stream of water is secured by liberating com-.

pressed gas within the tank.

In the accompanying drawings, Figure l is a vertical central section of my fire extinguisher; Fig. 2 is a plan view of the screw cap; and Fig. 3 is a top plan of the compressed-gas container used in my device.

Referring to the accompanying drawin s, I have used the numeral 5 to indicate t e cylindrical walls, 6 the concave bottom and 7 the conical top of an air-tight water tank. The top 7 is constructed with a central opening in which the lower end of a nipple 8 is fitted and permanently secured to the tank. This may be accomplished by a ring of solder 9 between the inner portion of said nipple and the top 7. The nipple 8 is provided with external threads on its upper periphery and receives the internally threaded cap 10. A washer 11 is seated between the end of the nipple and the cap to insurea tight joint. Said cap 10 carries a discharge conduit 12 which terminates ina threaded member 13 adapted to form a hose coupling. A discharge pipe 14, communieating with the conduit 12, is threaded into I the cap 10 and the lower end of said pipe extends nearly to the bottom of the tank when the cap 10 is screwed down on the nipple 8. A screen box 15 havin an opening therein encircled by an annu ar flange 16, is secured to the lower end of the pipe 14:by means of such flange. This screen serves as a strainer for the water as it passes into the dischargepipe 14. A bore 17extends axially through the cap 10 and at its upper end is surrounded by an annular extension of the cap to form a boss 18 which is internally threaded and serves.

as a packing 'box. The diameter of the opening in this boss is greater than that of the bore .proper. placed in this enlargement and a gland 20 is screwed down against the packingto prevent leakage around the valve stem 21 Annular packing 19 is (hereinafter described), which turns in the bore. The bore 17 extends through the nipple 22, formed on the cap 10. This nipple is perforated to form a passage 23 leading I from the bore 17 to the interior of the water tank and the wall of saidbore converges immediately below the passage 23 to form a beveled valve-seat 24. The then-reduced bore extends through the lower end of the nipple. This end of said. nipple is externally tlteaded to receive the head 25 of a metal compressed-gas container 26. Said container is a tube closed at one end and having its other end 27 crimped uponthe head 25. A washer 28 is placed between such head and the inturned edge of the tube to prevent leakage of gas from the con tainer. Thelhead 25 has a central aperture 29 surrounded by an upwardly extendin nozzle 30 threaded internally to fit around the threaded lower end of the nipple 22. A soft metal washer 31 is inserted between the nipple 22 and the nozzle 30 before said parts are screwed together to prevent leakage around the joint thus formed. A thin metal disk 32 is placed within the nozzle 30 and pushed down against the shoulder 33 surrounding the upper extremity of the aperture 29. A jam-washer 34, threaded and having a notch 35 cut diametrically across one side to receive the end of a screw-driver, is screwed down tightly against the metal disk 32 and an air-tight closure for the container is thus formed. The hole in the jam-washer 34 and the aperture 29 in the head 25 are alined with "the bore 17 extending through the cap 10 mafter described, to perforate said disk. At the other end of the stem 21 is fastened a wheel-handle 38 to turn said valve-stem.

To char e the device, the cap '10 is removed an the tank of the extinguisher is filled with water. The valve-stem 21 in said cap is backed-up by revolving the handle 38 until the point 37 of the stem is withdrawn into the bore 17. The container 26, having been previously filled with compressed gas, such as carbon dioxid, and sealed with the disk 32, is screwed onto the nipple 22 of the cap. Said cap is placed over the nipple 8 and tightly screwed thereon, the dischar e pipe 14: and container 26 entering said tan The extinguisheris then ready for use.

To use the extinguisher, the valve-stem 21 is rotated and longitudinal movement with respect to the cap is imparted thereto by means of the threads 36 in the bore 17; Such movement forces the point 37 downward until it perforates the disk 32 of the gas container. The compressed gas within the container then forces its way into the bore 17 and through the passage 23 into the tank. The water 1n the tank is thereby subjected to great pressure and forced through the .pipe 14: to the hose or other means which may be attached to the coupling 13 to directthe jet of water. 1

While in most cases it is not feasible to use a gas container for more than one operation of the extinguisher, yet, if the gas in the container is still under substantial pressure when the flow of water is no,

longer necessary, the valve on the stem 21 may be forced against the valve-seat 24 by revolving the handle 38 in the proper direc-- tion and gas in the container may then be maintained under pressure for subsequent use.

It is my purpose to furnish a supply of containers 26 with each extin uisher and when one has been'used, another maybe readily substituted therefor.

Having described my invention, what I claim as new and desire to protect by Letters Patent isz' In a device of the class described, the combination with a water reservoir having an opening at its upper end, of a' cap adapted to tightly fit said opening, said cap being formed Witha discharge conduit and a bore, a pipe in the tank, one end thereof communicating with said conduit and the other extending to the bottom of the tank, said bore having a beveled Valveseat therein and a passageway above such EARL M. EVLETH-

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