|Publication number||US2485723 A|
|Publication date||Oct 25, 1949|
|Filing date||Oct 7, 1946|
|Priority date||Oct 7, 1946|
|Publication number||US 2485723 A, US 2485723A, US-A-2485723, US2485723 A, US2485723A|
|Inventors||Fitzgerald Nicholas A|
|Original Assignee||Chester A Fitzgerald|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (16), Classifications (13)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Oct. 25, 1949. N. A. FITZGERALD 2,485,723
FIRE FIGHTNG APPARATUS Filed 001;. 7, 1946 2 Sheets-Sheet l p -m VK@ Oct 25 1949 l N. A. FITZGERALD 2,485,723
, FIRE FIGHTING APPARATUS Filed oct. 7, 194e 2 sheets-sheet 2 www Patented Oct. 25, l1949 UNITED STATE S PATENT OFFICE FIRE-FIGHTING APPARATUS Nicholas A. Fitzgerald, St. Paul, Minn., assigner to Chester A. Fitzgerald. St. Paul, Minn.
' Application october 7, 194s, semi No. 101,163
fog must be available.
In righting res accompanying airplane crashes, two types of fire combating agents are 1 now commonly used. These are fog and foam.
The former is simply a man made fog of water droplets suspended in airwhile the foam consists of minute air bubbles suspended in a soaplike foaming agent. The fog is used to extinguish the fire while the foam is used to blanket extinguished areas to prevent their being reignited.
Such fires must be brought under control very quickly if men trapped within the wreckage are to be saved and if substantial damage to the ships deck is to be prevented in the case of a crash on an aircraft carrier. The bringing of the rire under control should be accomplished within 30 to 50 seconds in order to accomplish these purposes.
At present, each reghting crew on air fields A and on aircraft carriers comprises '7 or 8 men who do nothing but iight res which ensue after aircraft crashes. These men use foam and fog, but with the present equipment, either separate groups are assigned to the foam and fog equipment, or else a different nozzle must be placed on the equipment each time it is desired to change from foam to fog or vice versa.
The crew members using fog usually advance into the fire iirst to extinguish the re with the fog after which the crew men using foam blanket the area with foam. Thus those advancing with fog must often walk through spills" of gasoline which, although not aiire, are open to the air and are not blanketed with foam. These spills may become ignited at any minute with disastrous results for the iogman" standing in the midst of the gasoline.
Where the same equipment is used with interchangeable nozzles, the re is iirst extinguished .in an area by fog after which the fog nozzle is removed and the foam nozzle placed n the equipment. This requires time and places the crew at a disadvantage, often fraught with considerable danger, as in the oase where an area which has been extinguished and which is about to be blanketed with foam, suddenly becomes reignited, requiring return to the fog nozzle in order to reextinguish the iire.
The crew members using fog carry liquid foam in hip packs" which must be replenished by crew members who carry fresh packs to them when needed. The heavy hip packs are unwieldy and bulky and greatly hinder the crew men who carry them.
It must now be apparent that the present equipment is hopelessly inadequate and is not at all conducive to the rapid extinguishing of iires, to the safety of the fireiighters. or to the most emcient utilization of personnel which is vitally necessary on warships and about crowded airfields.
Accordingly it is a primary object of the invention to provide fire righting equipment which obviates the above enumerated diiilculties.
Another object of the invention is to provide fire righting equipment which immediately provides fog or foam from the same device at the will of the operator and without removal or! replacement of parts. Fog is produced by the equipment at high pressure, while if foam is desired, the mere turn of a lever delivers high'or low pressure foam, or turns oil the device.
A further object of the invention is the provision of a novel valve and nozzle arrangement which by a very simple operation can supply fog at high pressure, high or low pressure foam, or can turn ofi the flow altogether.
Another object of the invention is to provide-a novel reel having foam liquid and water supplies and particularly adapted for .use with the valve and nozzle arrangement of the invention.
A further object of the invention is to provide` a novel type of hose for use with the apparatus. These and other objects of the invention will be apparent from the following specification and the 'accompanying drawings, in which Eig. 1 is a side elevational view of the nozzle with a portion of the valve casing broken away to show the valve in the off position;
Fig. 2 is a longitudinal sectional viewA of the nozzle showing the valve in the fog position;
Fig. 3 is a view similar to Fig. 2 but with the valve in thelow pressure foam position and the forward portion of the nozzle broken away;
Fig. 4 is a view similar to Fig. 3 but with the 1 valve in the high pressure foam position and a portion of the nomle shown in elevation;
Fig. 5 is a cross sectional view taken on line 6-5 of Fig. 3;
Fig. 6 is a perspective view of the rotatable portion of the valve;
Fig. 7 is a cross sectional view taken online 1-1 of Fig. 2 through the adjustable air inlet and showing the air supply openings entirely closed; l
view oi' the reel for .use with the nozzle shown inl the preceding views; and
Fig. 9 is a cross sectional view of the hose used l with the apparatus.
In a preferred embodiment of the invention as shown in the drawings, the fire fighting apparatus comprises, in general, a reel 28 shown in Fig. 8 which supplies foam liquid and water through a two channel hose 2| (Fig. 9) to a nozzle 22 where the now is controlled by a valve designated generally by the numeral 23.
Nozzle Nozzle 22 comprises an elongated tube 25 open at its front end 28 and enlarged at its rear end to form a bulbous valve housing 21. The extreme rear end 28 of the nozzle comprises a water inlet and is of reduced diameter. The water inlet 28 is fitted in any conventional manner such as by threads 29 to be attached to the water carrying channel 38 of hose 2|. Reduced rear end 28 of the nozzle is axially aligned with the forward portion of thc nozzle.
An opening 3| considerably smaller in diameter than water inlet 28 is provided in the bulbous valve housing 21 near the water inlet 28 and disposed at an acute angle with respect to the water inlet and the axis of the nozzle. Opening 3| comprises a foam liquid inlet and is provided with an attachment 32 for receiving foam liquid from the smaller channel 33 of the hose 2 I.
A movable valve 'member 35 is rotatably mounted within valve housing 21 on pivot rods 36 which extend from each side of the member at right angles to the plane in which water-inlet 28 and foam liquid inlet 3| are disposed. One end ofy one of the pivot rods 38 extends through a liquid tight packing (not shown) to the exterior of the valve housing 21 where it carries a valve operating handle 31 (Fig. 1). By moving handle 31, the pivot rods 36 and movable valve member are rotated within the valve housing. The other pivot rod 36 may conveniently be received by a suitable bearing (not shown) in the inner surface of the valve casing.
Tlwmovable valve member 35 is of novel construction and as shown in perspective in Fig. 6 comprises for convenience of description a portion of a at sided disk, one ilat surface of which is shown at 40. Portions of the disk are cut away and a hole 4| substantially the diameter of the Water inlet 28 extends diametrically through the member. Pivot rods 36 extend from the flat surfaces 40 of the disk and are located at the exact center of the disk. The thickness of the disk is only suillciently larger than inlet 28 to provide a thin wall about hole 4|.
The cut away portions of the disk leave extending portions 42 and 43 on opposite sides of the central disk portion through which hole 4I extends, the peripheries of each portion comprising extensions of the peripheral portions of member 35 lying at opposite ends of hole 4|. Portion 42 occupies a .considerably larger portion of the periphery of the movable valve member than does portion 43 and is of the same thickness as the original disk. The arcuate length of portion 42, exclusive of course of the adjacent part of member 35 occupied by hole 4|, is greater than the distance taken from edge 28a of water inlet 28 to the remote edge 3|a of foam liquid inlet 3| so that portion 42 when in the totally closed position of Fig. l closes both inlets. The length of the periphery of portion 43 is roughly equalv 4 to the inner diameter of water inlet 28. Portion 43 is of reduced thickness, being only wide enough to close foam liquid inlet 3| when portion 43 lies over the inner opening of that inlet. It should now be clear that portion 43 only partly closes inlet 28 when it is positioned over that inlet;
From the drawings it will be clear that the inner surface of valve housing 21 is dimensioned to provide substantial clearance about the periphery of movable valve member 35 except adjacent inlets 28 and 3| where only sufficient clearance is provided between the peripheral surface of member 35 and the inner surface of the valve housing to permit rotation of movable valve member 35. The last mentioned portion oi' the inner surface of the valve housing is therefore formed as a portion of the periphery of a circle having the axis of rods 38 as its center, and having a radius only slightly larger than the radius of valve member 35.
From the area of the internal surface of valve housing 21surrounding inlets 28 and 3|, the internal radius of housing 21 increases gradually so that when the valve is in the high pressure foam position (Fig. 4) which will be discussed in greater detail presently, a Venturi action is produced about both the upper and lower surfaces of valve 35 as viewed in Fig. 4. The vradius of the remaining area of the inner surface of housing 21 is substantially larger than the radius of the portion about inlets 28 and 3|.
A fog tube 5| of approximately the inner diameter of water inlet 28 and hole 4| is positioned within the forward tubular portion 25 of the nozzle. Tube 5| which is considerably smaller in diameter than tube 25 is concentric with tube 25 and is therefore axially aligned with water inlet 28. Spiders 52 fixed to the outer periphery of tube 5| and to the inner periphery of tube 25 hold tube 5| in place. The arms of spiders 52 are crescent shaped in cross section with the concave surfaces facing toward the rear portion of the nozzle. This configuration and disposition of the spider arms causes turbulency in liquid passing between the two tubes for a purpose which will be explained presently.
The rear end 55 of tube 5| is concave when viewed in longitudinal section as in Figs. 1-4, the radius of the concave surface being substantially the same as the radius of the portion of the inner wall of valve housing 21 adjacent openings 28 and 3| and being taken about a center comprising the axis of pivot rods 36. The forward end 56 of tube 5| extends well beyond the forward end 26 of tube 25 and is threaded or other- Wise adapted to receive a fog nozzle of conventional construction. A screen 56a is shown in the forward end of tube 5| to represent schematically a fog producer.A
The forward tubular part 25 of the nozzle has a provision for admitting air into the space between tubes 25 and 5|. This provision consists of a series of openings 60 angularly spaced about the periphery of tube 25 a short distance forward of valve housing 21. A band 6| having a like number of similar openings 62 is rotatably mounted about tube 25 adjacent openings 60 so that openings 60 may be covered or uncovered to any desired degree to regulate the amount of air admitted to the space between outer tube 25 and inner tube 5|.
It will now be apparent that the rear end 55 of tube 5| can be connected directly to water inlet 28 by opening 4| in movable valve member 35 when member 35 is in the position shown in s l rig. 2, that is, the tog position. 'me rear end o! tube l can also be completelyl closed by portion I2 o! member 35 when member 35 is in the low or high pressure fog positions as shown in Figs. 3 and 4.
Operation of valve and nozzle As shown in Figs. 1-4, the position of movable member 25 of the valve under the control oi handle 51 controls the emission oi -ioam and fos from the nozzle. When member 55 is in the position shown in Fig. 1,' both inlets and 3l are closed by portion 42 being positioned so as to cover the inner ends of these inlets. This is neither foam nor fog is coming out oi the nozzle.
When it is desired to spray iog from the nozzle, member 25 is turned to the position shown in Fig. 2 in which hole 4I in member 55 connects water inlet 25 directly with the rear end o! inner tube 5I and portion of member 35 lies over the inner end -ot inlet 3l so as to prevent ioam liquid from entering the valve and nozzle. Water passing under pressure into tube 5l passes through the fog nozzle where it is turned into a :log which is highly emcient in extinguishing iires.
A low pressure foam may be supplied by the nozzle by turning valve member 551:0 the position shown in Fig. 3 in which portion l5 oi' member 351s moved clear -oi' foam liquid inlet 3l and is assigns ses: In g. 8 is shown partly schematically a reel 20 for use with the nozzle previously described.
The reel comprises a central rotatable portion in which spaced disks 10 are mounted on a hollow axle 1l. The interior of the axle has a transverse positioned over water inlet 28. Because .of the reduced thickness oi portion I3, only a portion of the water pressure enters the valve 'to mix with and force ont foam liquid which enters through open inlet 5i. In this position of member 35, portion 42 closes the rear end -55 of tube 5I so that the mixture of water and foam liquid passes into the space between tubes 5| and 25 and past spider arms 52 which,because of their crescent shaped cross sectional coniguration. cause turbulence of the liquid. Air is admitted as desired through openings .55 by adjusting thev position oi' band 5l. Asaresult, a mixture of foam liquid, low pressure water, and air is thoroughly mixed within tube 25 and issues from the forward end 25 of tube 25 as a foam which when placed over a flammable substance excludes the atmosphere and prevents ignition oi the substance.
A high pressure supply of foam is obtained by turning member to the position shown in Fig.
liquid tight partition 12 which divides the axle into two interior conduit portions 13 and 1l.
Conduit 13 is adapted to -receive `loam liquid from a supply tank 1lb through tube 14a and a liquid tight rotatable end bearing 15 for axle 1|-, while conduit 'I4 receives water under pressure from a supply such as tank 10 'through tube 16a and a similar bearing 11. Outlets 18 and 15 communicating with conduits 15 and 1I, respectively, and extending radially outwardly from the axle have conventional fittings for receiving a exible liquid foam tube and a larger water tube 8|.
Tubes 80 and 8l may continue to the water and foam inlets 28 and 3l of nozzle 23 as separate tubes wrapped together at spaced intervals along their length as shown in Fig. 8 or they may be fused into a single unit as shown at 2| in Fig. 9, in which case tube 80 becomes channel 53 and tube 8l becomes channel 3 5. The reel may be positioned conveniently on a suitable stand 83` which may be located on any suitable `vehicle or 'on whatever support is desired.
It should now be apparent that I have provided a novel and highly emcient re fighting apparatus including a novel nozzle and valve which is well adapted to standardization for both hand line use and turret use, thus eliminating the multipiicity of types now used.
By using this nozzle, the entire water supply of a crash re fighting truck may be utilized for making foam inasmuch as the same supply is used for both foam and tog. This is impossible with present hand carried equipment unless a supply of two gallon cans of liquid loam are carried on thetruck. l
Most important, I have provided a single selector valve which provides shut ofi', high pressure fog, low pressure foam and high pressure foam.
I have described a preferred embodiment of the invention and I realize that the invention is susceptible of numerous A'modifications without 4 in which both inlets 25 and 5i are completely uncovered while the relatively long periphery of portion Blof member 35 permits movement of member 35 to this position while still closing rear end of tube 5I'by meansoi portion I2. In this position of member 55, the gradually widening space between the inner surface oi housing 21 and the periphery of member 35 produces a venturi 'action which increases the eiiiciency oi the arrangement. The increased velocity oi the liquidmixture through the gradually widening space causes a drop in pressure which draws additional foam liquid into the valve through the foam inlet. As in the case of the low pressure foam production asexplained above, water (now at full pressure), foam liquid and air are mixed in tube 25 and issue from tube 25 as a high pressure foam. In this case, it may be necessary to move band 5l so as to increase the supply of air to the mixture of foam liquid and water.
Suitable indicia (not shown) may be placed on the exterior oi the valve casing to indicate the various valve handle positions.
departing from the inventive concept. For
portions screwed together at a central point and pumps (not shown) may be inserted in tubes 14a 4 and 16a. It is my intention to cover all such modiiications coming within the scope oi the appended claims.
1. Apparatus for nre lighting and the like comprising a nozzle member, a valve housing comprising a rearward continuation'of the rear end of said nozzle and having two separate iiuid inlets, and a movable valve member having at least three different positions, said nozzle member, valve housing, and valve member being constructed and arranged to emit selectively only one of said fluids in one position of the valve member, a mixture of said fiuids in another position of the valve member, and to shut ofi in a third position of said valve member. I
2. Apparatus asset forthin claim 1 in whic said valve member has at least four positions. and said valve member has a portion for diminishing the volume of one of said fluids in said fourth position, whereby the mixture of said iiuids is 1 emitted at two diierent pressures,'selectively, in said second and fourth positions.
3. Fire fighting apparatus comprising concentric nozzle members, a valve housing connected to saidnozzle members and having. inlets for water and foam liquid, fog producing means associated with said nozzle, and a movable valve member associated with said nozzle member and having at least three positions, said valve member being constructed and arranged to close both of said inlets in one position, to connect said water inlet with said fog producing means in another position. and to permitmixture of water and foam liquid in a third position to provide foam.
4. Apparatus as set forth in claim 3, in which said nozzle member has a tubular wall, an air inlet means comprising at least one opening in the side wall of said nozzle member for supplying air to said water and foam liquid mixture.
5. Fire fighting apparatus as set forth in claim 3 in which said fog producing means includes a conduit mounted in spaced relation with said nozzle, means having a turbulence producing configuration for positioning saidconduit relative to said nozzle, said valve member having a portion constructed and arranged to close said conduit` to cause said mixed water and foam liquid to pass into the space between said conduit and said nozzle member and past'said positioning means when the valve member is in said third position, whereby intimate mixture of said waterand foam l'iquid'is produced.
6. Fire fighting apparatus comprising a tubular nozzle member having inlets for water and foam liquid, afog tube mounted within said tubular nozzle member in spaced relation thereto, turbulence producing means positioning said tube within said tubular nozzle member, and a movable valve member associated with said nozzle member and having at least three positions, said valve member being constructed and arranged to close both of said inlets in one position, to connect said water inlet with said tube and to close said foam liquid inlet, in another position, and in a third position to cause passage of a mixture of foam liquid and water into the: space between said tubular nozzle member and said fog tube where said turbulence producing means eiiect intimate mixing of said water and foam liquid.
7. Fire fighting apparatus as set forth in claim 6 in which air inlet means is provided in said tubular nozzle member to admit air for admixture with said mixture of water and foam liquid.
8. Fire fighting apparatus as set forth in claim 6 in which said tubular nozzle member has at least one air inlet opening into the space between said tubular nozzle member and said fog tube, and an adjustable member cooperating with said air inlet for varying the amount of air admitted to said space.
9. Fire fighting apparatus' including a valve having Water and foam liquid inlets, and a movable valve member having at least three positions, said 'movable member having a plurality of separate inlet blocking portions, one of said portions being dimensioned to close both of said inlets in one position of the member, and another portion being dimensioned to close said foam liquid inlet opening in a second position of said movable valve member, said last mentioned portion being positioned and dimensioned to uncover said foam liquid inlet and partially close said water inlet in a third position of said movable member.
10. Fire fighting apparatus as set forth in claim 9 in which a combined mixing chamber and valve movable member Vhaving a fourth position in which both of said inlets are uncovered and in which a venturi action takes place between said movable member and said casing to cause foam liquid to be drawn from said foam liquid inlet.
11. Fire fighting apparatus comprising a tubular nozzle member, a valve associated with said nozzle member and having water and foam liquid inlets. a fog tube within said nozzle member in spaced relation thereto, a rotatable valve member having an opening therethrough and having large and small portions, said rotatable valve member having atleast three positions, said large and small valve member portions being constructed -and-arranged so that said large portion closes both of said inlets in one position of said valve member, said opening connects said water inlet with said fog tube to produce fog and said small valve member portion closes said foam liquid inlet in a second position, and said inlets are exposedvand said large valve member portion closes said fog tube causing passage of a mixture of water and foam liquid into the space between said tubular nozzle member and said fog tube to produce foam in a third position.
12. 4Firefighting apparatus as set forth in claim l1, said movablevalve member having afourth position in which said foam liquid inlet isexposed, said lsmall portion partially closes said" fvvater inlet and said large portion closes said fog-tubecausing passage of relatively low pressure foam into the space between said tubular nozzle member and said fog tube, said water inlet being substantially completely exposed in said second position to provide foam at relatively high pressure.
13. Fire fighting apparatus as set forth in claim 11, said movable valve member having a fourth position in which said foam liquid inlet is exposed. said small portion partially closes said water inlet and said large portion closes said fog tube causing passage of relatively low pressure foam into the space between said tubular nozzle member and said fog tube, said water inlet being substantially completely exposed in said second position to provide foam at relatively high pressure, and air y inlet means in said tubular nozzle member for admitting air for admixture with said mixture of foam liquid and water.
14. Fire fighting apparatus as set forth in claim 11. said movable valve member having a fourth position in which said foam liquid inlet is exposed, said small portion partially closes said water inlet and said large portion closes said fog tube causing passage of relatively low pressure foam into the space between said tubular nozzle member and said fog tube, said water inlet being substantially completely exposed in said second position to provide foam at relatively high pressure, and adjustable air inlet means in said tubular nozzle member for admitting air for admlxture with said mixture of foam liquid andwater, whereby the amount of air admitted may be varied in accordance with the pressure of foam being produced.
15. Fire fighting apparatus comprising a tubular nozzle member open at it's fronty end and having a bulbous rear section provided with a water inlet and a smaller foam liquid inlet, a valve member in the form ofl a mutilated fiat sided disk rotatably mounted in said bulbous nozzle portion for rotation about anaxis substantially perpendicular tothejplanes of the fiat sides of the valve member, said valve member 'having an opening extending diametrically'therethrough and having two peripheral vsurface portions of different sizes casing surrounds said movable valve member, said 15 comprising arcs of a circle having its center as the four positions as follows: a` shut off position in which .said larger valve member portion covers both of said inlets. a fog position in which the smaller valve'member portion closes said foam liquid inlet and said valve member opening connects Isaid water inletand said fogtube,- a low pressure foam position in which said foam liquid inlet is open. said water inlet 1s perauy elosed by said smaller valve member portion; and said larger valve member portion closes the rear end of said fog tube so that a mixture of water and foam liquid passes through said tubular nozzle member. and a high pressure foam position in which both of said inlets are open and in which said larger valve member portion closes the rear end of the fog tube, whereby the full pressure of the water mixes with the foam liquid to force high pressure foam through said nozzle member.
16. Fire fighting apparatus as set forth in claim 15 in which said inlets are positioned closely together, the area of the inner surface of said bulbous rear section of the nozzle member adjacent said inlets being nearer to the axisof the movable valve member than the remainder of the inner surface of said section withv the remainder of the inner surface sloping inwardly to said section, said large and small portions of the valve member being so relatively positioned that when the valve member is in the high pressure foam position a peripheral end of one portion is near the part of the water inlet most remote from the foam liquid inlet and a peripheral edge o f the other portion 4 me of this patent:
is near the part of the foam liquid inlet remote from the water inlet, whereby a venturi 'action is set up through channels formed between the peripheries of -the valve member portionsv and the outwardly sloping inner surface of the bulbous rear nozzle section around the portion thereoi' occupiedby said inlets, which venturi action causes foam liquid to be drawn from the foam liquid inlet.
17. Fire fighting apparatus as set forth in claim 15 in which said fog tube is positioned within said tubular nozzle member in concentric spaced rela.- tion thereto, said foam passing through the space surrounding said tube.
Number 18A. Fire lighting apparatus as set forth in claim 1 5' in which said fog tube is positioned within said tubular nozzle member in' concentric spaced relation thereto by atleast one spider having arms which-are crescent shaped in cross section', and air inlet means in said tubular nozzle member operable to admit air into the space between said fog tube and said nozzle member. said foam passing through said space, whereby said spider arms cause turbulence of said foam mixture for producing intimate dispersion of air throughout said foam mixture.
i 19.. A movable valve member for use in fire fighting apparatus having a tubular nozzle .member, a' valve casing communicating with said nozzle. water and foam inlets, anda fog tube within said nozzle axially aligned with said water inlet and spaced from the walls of said nozzle, said valve member comprising a mutilated fiat sided disc. means for mounting said disc for rotation about an axis substantially perpendicular to the planes of the ilat sides -of the valve member, said valve member having an opening extending diametrically therethrough for connecting said water inlet with said fog tube said valve member having two peripheral surface portions comprising arcs of acircle having as its center the axis of rotation of said member, one of said portions being of suilicient thickness to close both of said inlets while vthe other portion is dimensioned to close said foam inlet completely and to close said water inlet partially.
20. A valve member as set forth in claim 19. said diametrically extending opening extending through both of said portions.
NICHOLAS A. FITZGERALD.
- REFERENCES crrnn The following references are of record in the UNITED STATES PATENTS Name Date 1,573,439 Bedford Feb. 1s, 192e 45 1,718,078 promener July 2, 1929 1,914,654 Tornblom June 20, 1933 2,003,184 Friedrich may 2s, 1935 2,071,174 Parker Feb. 16, 1937 2,036,711 Friedrich July 1a, 1937 5 2,136,230 Berman et a1 Nav.8,19sa 2,138,133 Betzler Nov. 29, 1938 2,139,828 Fausek et al Dec. 1a. 193s 2.342.050 Hurst Feb. 15. 1944 Certificate of Correction v dPatent No. 2,485,723 October-.25. 1 949 NICHOLAS A. FITZGERALD It is hereby certified that errors alppear in the printed speei'cation of the aboYe' numbered patent requiring correction as follows:
Column 7, line 14, for the words an air read and air;
and that the said Letters Patent should be read with these corrections Atherein the same may conform to the record of the case in the Patent Ooe.
Signed and sealed this 14th day of February, A. D. 195.0.
THOMAS AF. MURPHY, t
Assistant' Oohzmz'aaoner of Patentc-
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|U.S. Classification||169/14, 137/625.11, 137/625.12, 239/581.1, 239/310|
|International Classification||A62C3/02, A62C31/12, A62C3/00, A62C31/00|
|Cooperative Classification||A62C3/0207, A62C31/12|
|European Classification||A62C3/02B, A62C31/12|