Patent Application
20220280820
The present invention relates to a fire barrier to prevent infrared light from propagating from a forest fire to neighboring trees or houses.
Infrared heating (also referred to as “IR heating” herein) is the cause of the rapid and explosive spread of forest fires. A large percentage of energy released when wood burns appears as infrared radiation. For example, the infrared energy in a candle flame can be as high as 25% of the total energy released in combustion of the candle. In a forest fire, infrared energy that is emitted laterally, i.e., ground-parallel infrared radiation, heats nearby objects such as neighboring trees or houses. This leads to evaporation of moisture in the surrounding objects and can release flammable gases through a process called pyrolysis. Further, heat transfer from a wildfire can heat surrounding air to 1470° F., drying all flammable matter in the immediate vicinity and encouraging the fire to spread much faster.
U.S. Pat. No. 4,311,199 discloses a reusable portable firewall having a plurality of modular panels made of aluminum.
US 2010/0294520 discloses a fire shield system in the form of a fence that can be deployed between a fire and neighboring trees, houses, and other buildings. The fence is made of the fabric capable of withstanding high temperatures such as, for example, an aramid fiber. The fence is supported by a flexible support frame including tubular members that can be inflated.
However, the prior art shield systems have a problem in that a strong gust of wind could knock down the panels rendering them ineffective.
An object of the invention is to provide an improved fire barrier that reflects ground-parallel IR radiation back towards the fire, is easily deployable, easily transportable, and withstands wind gusts.
The present invention provides a plurality of panels with infrared reflectors that form a wall that reduces a forest fire's ground-parallel IR heating radiation that heats trees and homes in the forest fire's path of advance. The decrease in infrared heating results in a cooling effect that slows or stops the fire's explosive advance. Each of the panels is individually elastically bendable when exposed to a gust of wind and resumes its upright position after the wind gust has passed.
The fire barrier of the present invention can provide an infrared shading effect to firefighters, thereby lessening their needs for personal protective equipment which guard against infrared radiation exposure.
The use of the fire barrier of the present invention may also reduce the need for helicopter use to drop water or chemicals in a forest fire. By keeping the trees and homes cooler with the fire barrier of the present invention, no back burning fires need to be ignited.
The object of the present invention is met by a fire barrier that includes an inflatable base deployable from an empty state to a fully inflated state and a first row of panels including a plurality of first panels disposed on the inflatable base. The base supports the plurality of first panels in an upright state when the inflatable base is in the fully inflated state, thereby forming a wall having a first side and a second side opposing the first side. Each of the plurality of panels is independently elastically bendable with respect to the inflatable base. A coating of an infrared reflective material disposed on each of the plurality of first panels on the first side of the wall.
In one embodiment, the plurality of panels is arranged so that there are gaps between the successive pairs of the plurality of panels in the first row. The gaps form less than 5% of the area of the first side of the wall. In a specific embodiment, each of the panels is up to four feet wide and the gap between successive panels is 1-2 inches.
Each of the plurality of panels is inflatable with the inflatable base. The inflatable base and the plurality of panels are made of plastic.
The infrared reflective material includes aluminum oxide.
The inflatable base includes anchor tabs having holes for receiving stakes for holding the inflatable base on the ground. In a specific embodiment, the stakes may be connected to the anchor tabs obviating the need to separately carry the stakes.
In a further embodiment of the present invention, a second row including a second plurality of panels facing a second side of the wall formed by the first row, each panel of the second plurality of panels being arranged behind a respective one of the gaps in the first row. Each of the plurality of second panels includes a coating of the infrared reflective material facing the first side of the wall.
In yet a further embodiment, each of the plurality of first panels has a substantially uniform thickness. Alternatively, at least one of the plurality of first panels has a thickness that tapers toward a top of the first panels.
The base has a substantially flat bottom in the inflated state to provide stability. At least one side of the at least one of the plurality of first panels is perpendicular to the flat bottom of the base in the inflated state.
Other objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
In the drawings:
A first embodiment of the fire barrier 100 is disclosed in
The gaps 20 allow wind to pass through the fire barrier 100. Further, each of the panels 12 is elastically flexible relative to the base 10, so that if a strong gust of wind passes the fire barrier 100, the panels 12 will momentarily bend to let the wind pass and then will resume their upright position to continue to provide protection. The panels 12 are connected to each other only through the base 10 and thereby move individually in erratic winds. The base 10 includes anchor tabs 14 that can be staked and hold the fire barrier onto the ground below the fire barrier 100.
In the embodiment shown in
Each of the panels 12 is coated with a layer 18 of an infrared reflecting material. In the preferred embodiment, the layer 18 includes aluminum oxide. However, any other known or hereafter developed infrared reflecting material may alternatively be used in the layer 18.
The front side of each individual panel 12 of the fire barrier 100 can be folded as shown in
In a further embodiment shown in
In the embodiment of
In the embodiments of
Thus, while there has been shown and described and pointed out the fundamental novel features of the invention is applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
