@et E159 E929a . F. BERNARD SAFETY VENTILATOR FOR OIL TANKS Filed March 7, 1928 l 5 `_ _„ QH| _ [wn ______._W _„ _ _ T _ y __ _„ A __ vw m L/Uv/ .‘r® y@. mw@y ©©© vwQ© „0 ___„_s_ mWQ © GIJL. Vm\/il’_„ '// 1,731,406 Patented Oct. l5, 1929 UNITED STATES PATENT OFFICE IE‘RE‘DEVRIIK- BERNARD, 0F SAN, FRANCISCO, CALIFORNIA SAFETY VENTILATOR FOR OIL TANKÉ Application filed March 7, 1928. Serial No. 259,616. My invention has for its obj ect'a safety ven tilator adapted to lill the opening in an oil tank or the like and is especially adapted to prevent the accumulation ofpressure or vac 5 uum during the filling or emptying of such tanks or during the temperature changes and to prevent fire and the explosion‘of gases that may collect therein. . > In the handling -of hydrocarbon oils and 10 distillates in bulk in closed containers‘there is usually a space .unfilled by liquid at the top and at all times during filling o_r empty and described in the accompanying drawing and specification. In the drawing Fim 1 is a plan view of one embodiment of my invention. 55 Fig. 2 is a vertical midsection of Fig. 1. Fig. 3 is a vertical cross section through an oil tank or receptacle showing the device of Figs. 1 and 2 applied thereto and in op erative position. ' Throughout the figures simliar numerals refer to identical parts. ` 60 ' The numeral 1 indicates theltop portion of ing of such tanks such a space exists within a conventional oily tank or receptacle 2, hav which volatile and explosive vapors collect ing an opening therein through which is in 15 and any flame or ignition in the vicinity there troduced my ventilator, an outer cage portion 65 of is apt to ignite said vapors through the of which is shown by the numeral 3 turned manholes, hand holes or the like which are over and flanged at 4 and fitted with a per Y invariably provided to secure an equalization forated top member 5. At 6 is a fluid compartment into which dips of pressure and for introducing measuring the absorbent material shown at 7 and which 20 sticks, pipes, etc. It is customary to provide such tanks or. latter extends above the fluid contents 8 and storage receptacles with a hand hole or vent is supported by the member 9 so that by cap hole at top to allow escape of explosive gases illary attraction the fluid in the compartment andespecially an equalization of pressure, 6 maintains the material 7 above the bar 9 25 and my invention is directed toa closure saturated with fluid. The compartment 6 is spaced from the cage means for such opening or openings which will admit of the transfer of air from the 3 and the bar 9 horizontally spaced below outside into the receptacle of tlielgases fi‘om the top 5 provides a chamber within which a the interior to the exterior of said vessel sponge or similar absorbent material is lilled 30 through my ventilator to maintain the inter as shown -at 10. The Huid 8 through the absorbent wick or nal pressure eqn/al with the external and therefore prevent undue stresses on the walls fibrous material 7 therefore saturates the of the receptacle; and at the same time to sponge 10 which is kept wet with the fluid. prevent any possible transfer of liame or ig These objects I accomplish by providing 75 80 A fine screen 11 preferably covers the 35 nition into the gas, I.vaporor inflammable con sponge material 10 below the perforated top tents that may be in the'receptacle. 70 85 I member 5. A gasket is shown at 12 sealing the space a screen-like cage within which I maintain _between the ventilator and the top 1 of the a fluid compartment and a diaphragm of tank 2 with a conventional handle at 13 to 90 40 sponge, fibrous material., asbestosor the like, ' lift the ventilator’out when required. The top 5 is locked to the flange 4 as by the formingvminute intcrstices through which a bayonet lock membersl 14 and buttons 15. flame or ignition'will not'be propagated. This diaphragm is preferably maintained'ì The absorbent material 7 is preferably lwetted from the said water compartment, thus weighted as with the ring 20 to insure its 45 insuring a wetted diaphragm of a consider contact therewith at all times 'as the fluid 8 95 _ _. able area having minute and tortuous pas-I Cageß is perforated as at 16, 16, 16 and sages through which any gas or- vapors may freely pass in either direction but through also at the top as at 17, 17 thus enabling air, gas or vapors which may collect in the space which no flame or ignition can pass. evaporates. 50 A preferable forni of my invention is shown 18 to pass freely through the holes 16 spaced 100 2 10 1,731,406 between the cage 3 and compartment 6 as shown at 19, through the sponge or other dia phragm 10 thence through the screen 11 and opening 17 in the top or cover 5 to the outside of the tank 2 or vice versa and thereby equal ize and maintain equalized the pressure be tween the space 18 and the surrounding air. During the said passage the vapors are forced through the wetted surfaces of the in terstices in the diaphragm member 10 which functions to prevent the passage of any flame . or ignition therethrough. „ It will now be understood that my inven tion may be embodied in other forms than that shown in the drawing and specification without departing from the spirit of my in vention and I wish to be understood as claim ing all such. I claim: 1. As an article of manufacture a safety ventilator comprising a multiperforated cage, a fluid chamber fixed in suspended position within said cage, a perforated cover for said cage and spaced from said chamber, absorb ent material within the cage and between the chamber and the cover and communicating with the interior of said chamber. 2. As an article of manufacture a safety 30 ventilator comprising a multiperforated cage, a fluid chamber fixed in suspended position Within said cage, a perforated cover for said ' -cage and spaced from said chamber, absorb ent material within the cage and between the chamber and the cover and communicating with the interior of said chamber, a flange and gasket adapted‘ to support said ventilator within an opening. 3. As an article of manufacture a safety 40 «ventilator comprising a multiperforated cage, a fluid chamber fixed in suspended position within said cage, a perforated cover for said cage and spaced from said chamber,absorbent material Within the cage and between the chamber and the cover., a wick communicat ing with the interior of said chamber and in caplillary control with said absorbent mate ria . 4. As an article of manufacture a safety ventilator comprising a multiperforated cage, a fluid chamber fixed in suspended position within said cage, a perforated cover for said cage and spaced from said chamber, absorb ent material Within the cage and between the chamber and the` cover, a wick communicat « ing with the interior of said chamber land in capillary control'with said absorbent mate rial, a flange and gasket adapted to support said ventilator within an opening. 60 5. A safety ventilator comprising a pervi ous cage and a pervious cover for said cage, means for detachably holding said cover as sembled with said cage, a chamber fixed with 65 in and spaced from said cage and from said cover and having a top opening, absorbent material pervious to vapors forming a dia phragm between the cage and the cover and in capillary communication with the interior of said chamber. . ' 6. A safety ventilator comprising a pervi ous cage and a pervious cover for said cage, 70 means for detachably holding said cover as sembled with said cage, a chamber fixed with in and spaced from said cage and from said cover and,having a top opening, absorbent material pervious to vapors forming a dia phragm between the cage 'and the cover, a wick communicating with the interior of said chamber and in capillary contact with said absorbent material. i F'TEDERIK BERNARD.
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