Патент USA US2406679код для вставки
Aug. 27,1946. R. B. GRAY ET A1. FLUID TANKA Filed May 3l, 1940 .1. 2,406,679 2,406,670` Patented Aug. 27,n 1946 UNITED STATES PATENT oFFlcE FLUID TANK -Reid B. Gray, Dundalk, and Joseph C. De Weese, Parkville, Md., assignors to The Glenn'L. Mar tin Company, Baltimore, Md. Application May 31, 1940, Serial No. 338,052 2 Claims. (Cl. 154-435) 1 2 by a bullet. Many efforts have been made to provide a fuel tank, particularly for use in warfare, which will not leak if it is pierced by a projectile. Hereto fore such tanks have not been successful. It is the object of the present invention to produce a truly self-sealing tank which will not leak even 10 after it is pierced. v . Figs. 6, ’7 and 8 are ,similar views showing the The invention relates to containers and espe cially to tanks for liquid kfuel which are capable of resealing automatically if they are pierced, as passage of a bullet leaving the tank. As shown in Fig. l, the tank is composed of an outer rigid frame or container 2 and 'a cell 4. The container 2 may be of any suitable rigid material, but a metal such as a light aluminum alloy is pre- , ferred. The cell 4 is formed of a laminated material, shown in detail in Fig. 2. The nature of this material maybe somewhat Varied, but the fol- v lowing is preferred. The inner layer 6 is formed of a material re In the past most tanks of this type have been sistant to the liquid in the tank, for example an of metal with a covering of rubber, leather or artificial rubber such as neoprene. This` layer 6 other similar materials intended to Ybe self-seal ing so as to close any hole which might be formed 15 is preferably in the nature of a fabric impreg in the metal. Such tanks have been inadequate, We have found, because the projectile leaving the tank normally produces a larger hole than when it enters. This bends the metal of the tank out nated with the resistant material. Secured to layer 6 by a layer 8 of suitable cement, resistant to hydrocarbon or to whatever liquid the cell is to contain, is a layer Ii! of resistant material ward to such a degree that the covering layers 20 having considerable life, elasticity, resilience and softness, such as neoprene sheet. Outside of layer I0 and attached thereto by resistant ce ment I2 is a layer I 4 of plastic, non-absorbent often to enlarge any opening made therein. crude rubber free of vulcanizing agents or some The present invention provides a tank in which al metal container acts only as a support 25 other material soluble in the liquid. Secured on layer I4 by a resistant cement layer lli> is a layer ing frame for an internal fuel-containing cell I8 of elastic, resilient, soft vulcanized rubber. which is formed with self-sealing walls. The cell As is apparent from Figs. l and 2, the outer is made of greater outside dimensions than the dimensions of cell 4 are somewhat larger than inner dimensions of the metal-frame, so that all tensile strain is taken off .of the cell wall and is 30 the inner dimensions of frame 2, and the cell walls are free from the frame. This makes it taken by the frame. This dimension of the cell ` possible for the cell to transfer all the load of also puts the parts of the cell wall under com cannot reseal. Furthermore, the very nature of these layers on the outside of a metal tank is pression rather than under tension, so that there is a tendency for any holes which may be fo-rmed to close rather than to stretch open. Finally, the cell wall is formed of a laminated material, the inner layers being formed of a ma the liquid therein to the cell without being sub vjected to stretching. In addition the cell col 35 lapses as the fuel is drawn therefrom, so that in many cases a bullet may. pass through the tank 2. without piercing the cell. The joints of the dif ferent layers 6, I0, I4 and I 8 are staggered dur- ~ terial resistant to the liquid in the tank, such as ing the manufacture of the cell so as not to over artificial rubber in the case of petroleum fuels, x while the outer layers include a material which 40 lie one another. Figs. 3to 5 show the action of the tank as a is soluble in the liquid so as to seal up any hole bullet or other projectile enters it. The bullet formed therein. All the layers are flexible and forms a relatively small hole in the wall 2, the preferably elastic. , edges of this hole turning inwardly as at 2|! (Fig. Further objects and advantages of this inve - ‘ 3). The bullet then pierces the cell wall (Fig. 4). tion will appear more fully from the following description, particularly when taken in conjunc tion with the accompanying drawing which forms a part thereof.` In the drawing: After the bullet has passed through, the wall re- - turns to its normal position (Fig. 5), being held slightly bulged‘by the bent metal 20 around the hole. However, because of the greater dimensions of the cell asY compared with the frame, there is ample material to close the hole again in the manner shown. A certain amount of the fuel will Fig. 2 is a detail cross-section through one leak through the two resistant layers 6 and Ill wall of the tank; and will cause a swelling and adhesion of the Figs. 3, 4 and 5 show the passage of a bullet 55 rubber layers I4 and I8, as indicated at 22, thus entering the tank; ' Fig. 1 is a cross-section through a fuel tank embodying the invention; 2,406,679 3 4 effectively sealing the hole. In addition, the bullet second layer, and a fourth layer of soft vul canized rubber adhesively secured on the outside of said third layer. 2. A self-sealing hydrocarbon fuel tank com carries a slight amount of the rubber into the hole in the resistant layers which helps in the sealing. When the bullet leaves the tank (Figs. 6 to 8) prising a metal frame, a ñexible cell within said it makes a. larger hole, bending the metal of the frame, the outer dimensions of the cell being pro portioned with respect to the inner dimensions of the frame so that the hydrostatic load of the vent the cell 4 from springing back to its normal position, as shown in Fig. 8, in which sealing oc fuel is transmitted to said frame, the cell walls 10 being unstressed by the fuel load, the walls of curs in the same manner as in Fig. 5. said cell being free of the frame and including While We have described herein one embodi-i frame 2 out as at 24. However, this does not pre ' at least four layers arranged in the sequence ment of our invention we wish it to be understoodv that we do not intend to limit ourselves therebyV v except within the scope of the appended claims. 1 We claim: l. A self-sealing hydrocarbon fuel tank com- ' Í prising a metal frame and a ñexible cell within said frame,'the wall of said cell being free of the, . . frame and being formed of an inner layer of fabric’ ’ impregnated with artificial rubber, a second layer 20 of artificial rubber adhesively secured on the out side of said first layer, a third layer of crude rubber adhesively secured on the outside of said named; a layer of fabric impregnated with syn thetic rubber resistant to the chemical action of the fuel to be held in said tank, a layer of syn thetic rubber, a layer of crude unvulcanized rub ber subject to swelling upon contact with the fuel, and a, soft vulcanized protective layer, all of said layers being adhesively secured to adjacent layers to form a laminar structure. REID B. GRAY. JOSEPH C. DE WEESE.