US2209323A - Apparatus for producing fog streams - Google Patents

Description

July 30, 1940. Y coRLEy 2,209,323

APPARATUS FOR PRODUCING FOG STREAMS Filed June 7, 1957 42%] 6/ 2/ z: jfyl.%

Patented July 30, 1940 I UNITED STATES APPARATUS FOR PRODUCING FOG STREAMS John T. Corley, Providence, R. I.

Application June 7, 1937, Serial No. 146,709

2 Claims.

My present invention relates to fire fighting equipment, and has particular reference to a nozzle construction for producing streams of fog.

Chemical fires, and burning gasoline and oils cannot be effectively controlled by using streams of water, as the impact of the water merely splashes the burning material and thus increases the fire hazard, instead of blanketing or smothering the fire. The most effective means for combating fires of this type has been found to be the use of a stream of fog or finely dispersed water which will settle over the burning mass without splashing, to effectively exclude access of air to the combustible material.

It is the principal object of my invention to provide a nozzle construction of simple character which can produce a very effective fog stream when attached to standard hose connections.

It is a further object of my invention to provide a standardized construction which will accommodate difierent pressures and different sizes of hose connections used for standard fire fighting equipment, so as to permit formation of a fog stream with any type of standard equipment.

With the above and other objects and advantageous features in view, my invention consists of a novel method and a novel arrangement of parts more fully disclosed in the detailed description following, in conjunction with the following drawing and specifically defined in the claims appended thereto.

In the drawing,

Fig. L discloses a standard type of nozzle equipped with my improved fog producing cap;

Fig. 2 is a vertical section on the line 22 of Fig. 1;

Fig. 3 is a plan view of the novel cap;

Fig. 4 is a rear view of the novel cap;

Fig. 5 is a diagrammatic view showing the path of the water through the novel cap;

Fig. 6 is a plan view showing a modified construction; and

Fig. '7 is a section therethrough.

Referring to the drawing, a nozzle ID of a standard type is provided with a fog producing cap H, which cap has a base flange I2 which is provided with the usual gripping recesses I3 and is internally threaded as at I 4 to permit detachably threading on external thread l5 at the upper end of the nozzle I 0. A recess I6 is preferably provided in the base, just above the threads I 4, to

receive a packing washer l1, and the base of the nozzle [0 is internally threaded as indicated at l8 and is also provided with a recess 19 in which a packing washer 20 is positioned, for detachably securing to standard fire fighting water connections.

If desired, the nozzles I0 may be made of different sizes to fit different size connections, or a coupling of standard type may be used, whereby 5 one nozzle l0 may be detachably connected to any standard hose or nozzle'tip.

The novel cap II is preferably dome shaped as indicated in Fig. 2, and is provided with a plurality of concentric slots 2|, see Fig. 3, internal 10 supporting ribs 22 being preferably positioned as illustrated in Fig. 4 to permit the use of completely circular slots. As indicated in Figs. 5 and '7, the slots are preferably parallel; thus forming fiow channels with parallel sides and having a 15 substantially uniform angular relation to the axis of the nozzle and the direction of flow of the fluid, the results of practical tests have disclosed that the water emerging from these parallel slots, under the usual pressures, will mix as indicated 20 in Fig. 5 to form a very fine fog stream about six to eight feet wide and extending up to forty feet in length, depending on the pressure of the water supply. Since the volume of water and the pressure vary with the fire fighting system and '25 the pressure pumps used, it has been found desirable to use caps with a number of annular slots determined in accordance with the volume and the pressure; high volume and high pressure require a greater number of annular slots, as for 30 example illustrated in the modification shown in Figs. 6 and '7, and low volume and pressure require a smaller number of slots, see Fig. 3. Experience has shown that the best fog results are obtained when the annular slots are in parallel 35 relation, as radial slots produce a wide scattering of the spray instead of forming a long fog stream of relatively narrow width.

Although I have disclosed my invention as particularly suitable for fire fighting equipment, 40 the principles thereof may be readily applied to any spraying device with which it is desired to form a column of fine spray of extended length. While I have disclosed a specific embodiment of my invention it is obvious that changes in the 45 arcuate fluid flow slots, said slots being in substantially uniform angular relation to the direction of flow and said guide member being threadedly engaged with the discharge end of said 5 z; conduit.

2. A device for producing a fog stream, comprising a fluid conduit, and an integral, one-piece, dome-shaped guide member having concentric

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