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Publication numberUS2359573 A
Publication typeGrant
Publication dateOct 3, 1944
Filing dateMar 13, 1943
Priority dateMar 13, 1943
Publication numberUS 2359573 A, US 2359573A, US-A-2359573, US2359573 A, US2359573A
InventorsMackay Denver R
Original AssigneeMackay Denver R
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Means for fighting forest fires
US 2359573 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

I D. R. M cKAY 2,359,573

MEANS FOR FIGHTING FOREST FIRES Filed March 13, 1-943 INVENTOR 05/71 52 A. flQ/M/(A v BY Patented Oct. 3, 1944 UNITED STATES PATENT OFFICE,


Application March 13, 1943, Serial No. 479,045

3 Claims.

My invention relates to chemical bombs, and while adapted for various uses where area distribution of chemical gases for various purposes is desired it is more particularly adapted for use in combatting fires from airplanes.

The invention has for its main object the provision of an improved bomb to be dropped from airplanes upon fire areas to spread fire' smothering gases thereover for the purpose of extinguishing the flames. Another object is to provide a bomb of the character referred to which is of simple, compact and inexpensive structure, and easily and safely handled, and automatic in its operation.

Other objects and advantages of the invention will become apparent from the following description of the illustrated embodiment thereof, wherein;

Fig. 1 is an exterior side elevational view of a bomb of the invention in an inoperative collapsed condition;

Fig. 2 is a similar view but in an operative infiated condition;

Fig. 3 is a sectional view of an element of the invention; and

Fig. 4 is a view showing the preferred application of the invention.

The invention embodies primarily an inflatable and normally collapsed bag I which is formed preferably of flexible material, such as rubber. Integral rib portions II for reinforcing the bag are provided. At one end of the bag is a neck [2 having an opening I3 leading into the interior I4 of the bag. Secured in the neck I2 by any suitable means such as the strap I5 is a weighted plug [6 which carries a container II by means of the support l8 extending interiorly of the bag II).

The invention contemplates the use of chemical solutions such as sulphuric acid and bicarbonate of soda solution which when admixed will produce a fire-extinguishing gas which is heavier than air.

In using the invention to fight a fire which would otherwise be remote from adequate fire control facilities, an airplane previously equipped with bombs of the invention is dispatched to the scene. The bombs may be either in assembled or unassembled condition, but it is preferred to carry the bombs in unassembled condition. Thus the plane will be equipped with a supply of the various parts of the bombs to be assembled by an attendant during the flight to the fire area. In assembling the bombs a portion of soda solution is first placed in the bottom of the bag In,

and a portion of the acid solution is placed in the container I1, and the latter is then snapped onto the support I8 by means of resilient fingers 20 extending from the support. The plug lBis then secured into the neck l2 of the normally collapsed bag It! by the strap I5, in the position as shown in Fig. 3, with the opening 2| of the container I! held upwardly to prevent the acid from running out and causing a premature admixture of the chemicals. Any desired number of these bombs may be so prepared while the plane is on its way to the fire area. A book 22 is provided in the plug by which the prepared bombs may be hung up in the position as illustrated by Fig. 1 upon any suitable support means, such as a wire 23 carried within the plane 'interior. i

When the plane is approaching the fire area, as illustrated in Fig. 4, the attendant begins throwing the bombs out of the plane. The forces of gravity acting upon the weighted plug l6 turns the bag over to the attitude shown in Fig. 2, thus releasing the acid solution from the container I! to mix with the soda solution in the bag In, thereby generating the flame smothering gas which accumulates in the bag, causing it to expand as the gas is generated. The ribs ll' exert a restraining effort upon the expansion of the bag causing the gasto be somewhat compressed. The bombs float down toward the fire area, and upon striking trees or other sharp objects, or upon contacting the flames of the fire the bag becomes ruptured thereby releasing the gas to smother the flames. Other general applications of the invention where fire is a hazard, such as in homes, industrial plants, etc., are believed obvious. The prepared bomb may be hung by the hook 22 in any strategic place, and thus if a flre should start the bomb may be readily removed from the support and turned over to cause a mixture of the chemicals to form the fire-smothering gas. Then the bomb may be thrown into the flames which will rupture the bag and release the gas to smother the fire.

Various adjustments may be made to either retard or speed the generation of gas within the bomb. One method is to vary the size of the opening 2| of the acid container [1. Another method is to vary the quantity of either or both of the chemicals. The bag may be made to be self-rupturing by supplying enough chemicals therein to generate gas in excess of the capacity of the bag, whereby the thinner wall sections of the bag between the ribs II will burst under the gas pressure.

Thus the invention provides an improved fire fighting or other gas laying means, comprising a flexible container which is adapted to be stored in an airplane or the like within a minimum of space prior to arrival at the dispensing point. Upon arrival at the dispensing point the container may be simply discharged from the carrying vehicle whereupon it will automatically assume an inverted attitude resulting in mixing of the gas generating reagents. As the gas generating process proceeds the container expands to accommodate the generated gas, thus assuming a greatly enlarged condition at a time when space consumption is no detriment, and whereby the generated gas is retained by the-elastic bag against wasteful dispersion thereof. Upon arrival at the land area over which it is desired to dispense the gas the gas bag is in such elastically distorted condition as to be adapted to be ruptured with extreme facility, as in response to slight. contact with any hard object or in responseto the gas pressure forces which may be arranged to exceed the strength of the bag material. Thus, upon rupturing of the bag the gas isfinally delivered to the desired land area in the formrof a blanketlof concentrated gas which is adapted to smother the area andto displace therefrom the, suppl of air normally surroundingthe same.

. It will also be understood that the bomb of the inventioncan be used to distribute, chamical warfaregases over battle areas by following the loading and dispensing technique described hereinabove; and, that although the bomb herein illustrated and described ismerely one embodiment of theinventive principles thereof, the invention may be applied to other physical embodiments without. departing from the scope and spirit of theinvention claimed.

I claim:

1. An inflatable aerial bomb for distributing fire smothering gas over fire areas comprising, in combination, a normally collapsed bag having an opening therein, weightedmeans for sealing said opening, said weighted means having container. means associated therewith for holding a gas producing chemical agent, a second chemical agent contained in said bag separate from said first chemical agent when the bag is supported in upright attitude but which when admixed with said first chemical agent is adapted to react therewith to produce a heavier than air fire extinguishing gas for smothering fires, said weighted means being adapted to cause said bag to assume an inverted attitude when said bag is released in the air to provide admixture of the chemical agents to produce gas to inflate said bag during descension thereof toward a fire area, said bag being adapted to become ruptured upon contact with solid objects to allow said gas to spread over the fire area to smother the fire.

2'. Anaerial'bomb for fighting fires, comprising in combination a flexible inflatable bag adapted to carry a chemical supply therein and having a wall portion adapted to rupture upon tearing contact with ground objects, a separate openmouthed chamical container supported normally within said bag for withholding its chemical contents from mixing with thefirst mentioned chemical supply Within said bag, and means for causing said bomb to tilt when jettisoned from an aircraft or the like and to thereby upset said chemical container to provide mixing of said first'and second mentioned chemicals for generation of a fire extinguishing gas.

3. A rubber balloon-like aerial bomb for distributing flame smothering gas over fire areas, comprising a normally collapsed flexible bag adapted to receive a supply of loose chemical material therein, an open-mouthed container 1 mounted within said bag for holding a second chemical normallyseparate from the first mentioned chemical within said bag when said bag is in an upright attitude, and means associated with said bag for causing it to automatically tilt upon being discharged from a moving vehicle or the like and upsetting the chemical contents from said container for mixing thereof with the first mentioned chemical for producing aflame smothering gas tending to inflate said bag; said bag being rupturable when coming into puncturing contact with ground objects for releaseofthe flame smothering gas therefrom.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2426771 *Oct 9, 1944Sep 2, 1947Charles B HarpAirplane mounted fire extinguishing apparatus
US2895693 *Sep 22, 1956Jul 21, 1959Socrates G PortiasFire fighting airplane
US4197915 *Sep 29, 1978Apr 15, 1980Eoudis MartinSelf-righting thrown or rolled spherical fire extinguisher
US4836292 *Mar 31, 1987Jun 6, 1989Behringer Cecil RMethod for cooling a nuclear reactor and a product therefor
US5894892 *Jun 25, 1997Apr 20, 1999Huang; Chien-MingStructure of fire extinguishing bombs
US6318473 *Aug 18, 2000Nov 20, 2001Talmadge O. BartleyExpansive fire extinguishing system
US6364026 *Mar 17, 1999Apr 2, 2002Irving DoshayRobotic fire protection system
US6474564 *Jan 19, 2001Nov 5, 2002Irving DoshayTargeting, small wildland fire extinguisher dropping system
US6549827 *Nov 20, 2000Apr 15, 2003John YenFire prevention automation commanding control system using satellite-location/geography-information
US7089862 *Jan 9, 2004Aug 15, 2006Robert VasquezWater pod
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US7261165 *Sep 13, 2006Aug 28, 2007Benjamin BlackAppartus for fighting forest fires
US7614456 *Feb 28, 2007Nov 10, 2009Thomas TwumFire retardant delivery system for fighting wild fires
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US9120570 *Feb 26, 2013Sep 1, 2015The Boeing CompanyPrecision aerial delivery system
US9149672Feb 7, 2012Oct 6, 2015Bader Shafaqa Al-AnziEncapsulated fire extinguishing agents
US9393450Mar 27, 2013Jul 19, 2016Kyle SchuellerFire suppression aerial delivery system
US20060011355 *Jun 30, 2004Jan 19, 2006Cleary William WFirefighting bomblets and a precision aerial firefighting method utilizing the same
US20060162940 *Oct 9, 2003Jul 27, 2006Carl PohlerFire extinguisher
US20080087444 *Oct 12, 2006Apr 17, 2008Held Jerry MNew technique for fire fighting-large scale open fires
US20080202772 *Feb 28, 2007Aug 28, 2008Thomas TwumFire retardant delivery system for fighting wild fires
US20110247841 *Apr 8, 2010Oct 13, 2011Juan Abel FernandezApparatus for Firefighting
US20140239123 *Feb 26, 2013Aug 28, 2014The Boeing CompanyPrecision aerial delivery system
EP1043044A2 *Apr 5, 2000Oct 11, 2000Reinhard EffenbergerMethod and apparatus for extinguishing forest fires from the air
EP1043044A3 *Apr 5, 2000Oct 31, 2001Reinhard EffenbergerMethod and apparatus for extinguishing forest fires from the air
U.S. Classification169/36, 169/53
International ClassificationB64D1/16, B64D1/00
Cooperative ClassificationB64D1/16
European ClassificationB64D1/16