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Патент USA US2388508

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NOV. 6, 1945.
L, G_ M_ TlMpsoN
Filed March 4, 1944
Patented Nov. 6, 1945 r
Lewis G. Morris Timpson, Plain?eld, N. J.
Application March 4, 1944, Serial No. 525,066
2 Claims. (Cl. 261-116)
The present invention has for an object to pro
vide an improved nozzle for‘ use in producing and
effect a vigorous impingement of two liquid
streams upon each other. In front of the point
delivering ?re extinguishing foam.
of impingement a cylindrical bai?e member or
Another object is to provide a nozzle suitable
spray straightener l l is provided which serves to
for production and use in very small sizes. And 5 con?ne the spray and to break up larger drops or
another object is to provide a choice of type and
streams and thereby greatly increase the surface
quality of eiliuent most suitable to the peculiari- \ \ area of the liquid to achieve a high volumetric
ties of the ?re at a given moment.
aspiration of the gas. The stream of spray pass
The nature and object of the invention will be
ing forward is well adapted for aspiration by air
better understood from a description of a partic 10 entering a series of holes I 2 in the side of the
ular illustrative embodiment thereof for the pur
. nozzle. In order that the spray shall not exit
poses of which description reference should be
through the holes I! they are so positioned that
had to the accompanying drawing forming a part
all drops driving forward from the point of im
hereof and in which
pingement of the two streams in the passages
Figure 1 is a central sectional view of a foam
forming nozzle embodying the principles of the
15 Iii-l0 which do not impinge against the ba?‘le
will pass beyond the air inlet holes before strik
ing the wall of the nozzle.
Fig. 2 is a plan view of the same.
Fig. 3 is a sectional view taken on the line 3-3
of Fig. 1.
The size of the passages l0-—lll is suitably pro~
portioned for the size of the nozzle and the rate
20 of ?ow of the liquid.
Fig. 4 is a longitudinal section of another form
of nozzle and
Fig. 5 is a sectional view taken on the line 5-5
of Fig. 4.
The basic elements of these nozzles are taken
from the old art of aspiration nozzles and in par
ticular from nozzles of the type wherein large
volumes of gases are educted by small volumes of
liquid under high pressure. These foam nozzles
shown for the purposes of illustration provide for 30
thorough incorporation of the gas within the
liquid mass and provide adequate means to re
The present invention com
pensates to a large extent. for such defects of
manufacture in the smaller sizes as burrs,
rounded edges and the like and for imperfections
incident to usage such as'corrosion and adher
ence of small particles by the provision of the
protective ba?ie ll interposed between the point
oi’ formation of the spray-like jet and the point of
aspiration in the chamber 9. The baille will re
form elements of the spray which by faults of the
nozzle have motion other than substantially for
Nozzles of smaller sizes can be used satisfac
cover some of the kinetic energy of the supply
torily with double acting hand pumps. These
stream in the form of pressure energy.
nozzles do not give a constant pressure supply
The nozzle 5 as shown in Figs. 1, 2 and 3 is de 35 and the design of the nozzle may be varied to
signed to receive foam-forming liquid under pres
provide the best aspirating eiiiciency for a par»
sure and to cause aspiration of the liquid to pro
ticular pump and the pressure available.
vide air foam and to project that foam with suit
The ratio of contraction of the collector por
able force. As shown, the rear or base portion 0
tion of the nozzle is about 4 to 1. The base or
is formed for connection to a liquid supply hose 1 40 handle 8 has a forward protective ring I! spaced
and the forward tapered convergent nozzle por
outward from the body of thenozzle and extend
tion or collector element 8 forming an aspirating
ing far enough forward with relation to the air
chamber 9 is also so formed that “3168.11 be con
inlet holes I! to prevent the holes from being
nected to a delivery hose if desired.
accidentally closed by the hand of one using the
The aspirating chamber of the nozzle is de 45 nozzle and yet the holes freely admit air.
signed to receive foam-forming liquid entering as
Variation in operation of the nozzle is aiforded
a spray under pressure and to allow aspiration of
by the arrangement shown in Fig. 1 in that the
the atmosphericair and consolidation of the two
impingement spray-forming passages ill-4t are
?uids. The design is such as to recover suitable
carried in a rotatable valve member l6 which also
pressure to project the resulting foam to the 50 has a passage l'l straight through at a right
required distance and in the required quality.
angle to the plane of the impingement passages
Between the inlet of the nozzle and the aspir
lO-IU. The valve member can be rotated for
ating chamber 9 a spray-forming arrangement is
use to provide either a foam-producing nozzle or
provided having two angularly related passages
to provide a nozzle throwing a substantially solid
lO-HI meeting at an angle of about 60 degrees to 55 stream. The eilluent 01' the solid stream will still
tion the stream will have the oil-wetting power
of the chemicals generally used in foam produc
eight or more carbon atoms, and various solu
bilized proteins are also suitable. A solvent may
be demanded by the conditions of service.
It will be understood that the foregoing de
scription of particular embodiments is illustra
tion. It will have a distance throw substantially
equal to that of the usual water stream.
tive merely and is not intended to be construed
as de?ning the limits of the invention. Various
cause aspiration to a certain extent and will
therefore have some foam-like quality with cor
responding ?re—extinguishing value, and in addi
modi?cations and adaptations may be made
In many instances in the attack upon a serious
without departing from the spirit of the inven
oil or gasoline ?re this choice of eflluent will have
great value. Many of these ?res are of such ex’ 10 tion as de?ned in the appended claims.
treme intensity that approach to them su?iciently
I claim:
1. A foam-forming nozzle of the character de
close to apply conventional foam is impossible
scribed having a_plurality of forwardly directed
but the use of the substantially straight jet makes
jet-forming passages entering the rear of the '
it possible to subdue the ?re to such a degree
that later approach for the ?nal smothering op 15 ,inozzle at an angle to one another so as to bring
a plurality of entering liquid jets into the nozzle
eration will be quite feasible. At other ?res
in impinging relation one to another to form
spray, lateral ports in the side of the nozzle rela
tively close to the position of entrance of the
tional foam to be applied. These features of 20 Jets, a rotatable transverse valve member through
combat have particular value on ships and in
which the jet-forming passages pass whereby ro
crowded structures.
tation of thevalve member will vary the spray
The nozzle shown in Figs. 4 and 5 is similar
formed, and a cylindrical baiiie within which the
in principle to that described above.
spray is formed and by which it is con?ned.
2. A foam-forming nozzle of the character de
The handle or base member 20 is formed for 25
scribed having a plurality of forwardly directed
convenient attachment to a small hose 2|. The
jet-forming passages entering the nozzle at the
base is threaded to receive the collector element
rear at an angle to one another to bring a plu
22 between the end of which and a shoulder of
rality of entering liquid jets into the nozzle in
the base member a combined spray-forming ele
ment and batlle member 23 is secured. A rubber 30 impinging relation to form a ?ne spray, a cylin
washer 24 insures a liquid-tight joint. As in the
drical ba?le surrounding the position of impinge
ment and extending forwardly to con?ne and
embodiment of Fig. l the base member is formed
with a protective ring 25 which projects over the
direct the spray, and lateral ports in the exterior
air inlet holes 26.
nozzle wall outside of the ba?ie for admitting
The preferred foam-forming liquid contains in 35 air to the spray but so positioned relative to the
baflle as to be protected from the spray formed
aqueous solution as its principal active ingredient
within the ba?le substantially as and for the
approximately 1% of sulfonated lauryl alcohol.
purpose described.
Various other water soluble salts and esters of
the saturated fatty alcohols and esters having
splashes of some violence of a foam-like e?luent
are desirable to reach around walls until such
subduing of the ?re as will allow the conven
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