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Патент USA US2256902

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Sept. 23, 1941.
Filed Nov. l'7,~ 1958
2 Sheets-Sheet l
I/ NTO/e
Marías /gf w25/¿Sigg
Sept. 23, 1941.
Filed NOV. 17, 1938
2 Sheets-Sheet 2
~ 2,256,902
, remise ’sepa _23,’1941`
rma moments ooNsï'mUorroN
‘essere x. antenne', crime reime, men.
' [email protected] November 1'1, 193s, Senn No. 240,892 l
z calma. ' (ci. rea-15s)
'îhis invention relatesto a ilne vextinguisher
be either a total absence or a minimum of slip
oithehandtypepage of ñuid past the piston when reclprocated
The main objects of this invention are to pro
in its cylinder. It is also well mown that dueto
vide a nre extinguisher which is assured of being
the inherent character of iire extinguishing iiuids
in operable condition regardless of the length
there is a great tendency for corrosion to take
of time of non-use and which therefore can be
depended upon at all times in theevent of emer
place within the ñre extinguisher on those parts .
which are contacted by the ñre extinguishing
-gency; to provide a construction in which the pis
iìuid. This corrosion will oftentimes freeze the
ton packing will have a close working ñt so as to
piston to the cylinder wall when the nre extin
, prevent slippage of iiuid met the piston and’stili 10 guisher has not been in use for a long period oi
not be frozen in position by corrosion regardless
time with the result .that when the emergency of
of thelength of time of non-use of the extin-ñre arises it is often impossible to operate the lire
-guislier; to provideV a construction in which one
extinguisher and disastrous results follows.
end of the cylinder Íis enlarged wherebythe piston
The important problem of the iire extinguisher
>packing is not compressed and caused to takea
permanent set when the extinguisher is not used
for long periods of time; to provide a construc
manui’acturer is to make an apparatus which is
tion in which the piston maybe provided with -
unquestionably Iwill operate immediately -when
resilient felt packing rings which will retain their
original size regardless of the length of time of
leak-proof when the extinguisher is not in use
and at the same time have an extinguisher which
non-use; to provide a construction in which the
felt packing' rings provided around the piston
serve as a centering means for the piston and
thereby prevent metal to metal contact of the
piston and cylinder in which it reciprocates; and' 25
to provide improved means for stripping the ñuidl
from the piston rod so as to prevent slight leakf
age or. dripping when the rod is reciprocated
through its packing gaskets and which means is
the emergency of fire arises. It is of course self
evident that a nre-extinguisher from which the
?lre extinguishing duid has leaked or evaporated
out or a nre extinguisher which is frozen and will
not operate in case of an emergency are both
' worse than having no ilre extinguisher at all.
The use of felt lpacmng rings on the working
face of the piston tor making a ñuid tight seal
with the cylinder walls has not heretofore been
satisfactory for the reason that during long peri-g
odsfor non-use the packing is held compressed by
resilient and yielding so _as to not become frozen' 30 reason of- its tight fit in the cylinder and will
on the rod by corrosion during long periods of
thereby lose its expanding resiliency with the re
sult that much slippage of fluid occurs past the
An illustrative embodiment of this‘invention is
piston during the pumping strokes.
shown in the accompanying drawings, in which:
In the present invention the well recognized
» li‘lg.` 1 is a longitudinal medial sectional view, 35 dimculties have been entirely overcome by pro
with the middle broken out, of a nre extinguisher
viding a piston which has substantial clearance
embodying the new improvements.
' with the cylinder walls; providing the working
Fig. 2l is a sectional view taken on the line 2-2
of Fig. 1, looking in the direction indicated by the
, Fig. 3 is asectional view taken on the line 3-3
of Fig. 1.
Flg._4 is a fragmentary sectional view of the
face ofthe piston with felt packing rings, and
then having the lower end of the pumping cylin
40 derfin which the piston normally rests when the
. extinguisher is closed and not in use, of larger
diameter than the remainder of the pumping
cylinder with the result that the packing rings
lower end _of the pumping cylinder showing the
are not subjected to- any compression whatever
sliding piston in a position on the piston rod op
posite to that shown in Fig. 1.
Fig. 5 is an enlarged, fragmentary, medial sec
tional view of the improved fire extinguisher
when the extinguisher is not being used. Fur
thermore, the entire piston, when in the enlarged
portion of the cylinder, will have suillcient clear- l
_ ance'with respect to the cylinder wall to prevent
the corroding together of the metal parts during
rod packing glands and sealing means.
50 vperiods of lnon-use. When the extinguisher is
As is well known in the ilre extinguisher> art, it
`used the piston will be held centered in the cyl
isboth desirable and necessary to have the piston,
lnder by the packing rings and not have any
which reciprocates in the pumping cylinder for
metal to metal contact with the‘cylinder walls
expelling theJ fluid from the extinguisher, nt
with the result that freezing or sticking of the
» showing the details of construction of the piston
snugly with very close limits so that there shall iid-piston in the cylinder is impossible.
The lower end of the hollow shank 2| is flared
out to provide a cylindrical sleeve 3I which sur
roundsy the axially slidable sleeve 22 and which is
provided with diametrically opposed axially ex
tending inwardly presenting slots 32 and 33
which receive similarly disposed ribs'34 and 35
respectively which are integrally formed on the
slidable sleeve 22 whereby the sleeve and handle
ground into the faces or displaced so Athat a very
are non-rotatably secu'red while permitting rela
effective seal is secured whichis maintained un
der spring tension during non-use of the ex 10 tive axial movement therebetween.
The hollow shank 2I of the handle 2U is pro
tinguisher with the result that it is impossible for
vided with an axially extendinglbore 36 in which`
the fluid to leak or evaporate out of the reservoir.
is housed a helical compression spring 31, one
Another problem encountered in the use of fire
end of which -abuts the blind end of the bore 36
extinguishers having felt packing glands for the
piston rod has been that of the fluid adhering 15 and the other end of which contacts an axially
slidable iioating seal 38, th‘e inner face 39 of
to the piston rod as it is drawn through the gas
-vWith respect to sealing the reservoir against
evaporation duringnon-use, this improved ex
tinguisher is provided with a spring pressed seal
in which the complementary contacting sealing
faces are rotated while being axially compressed
with the result that any dirt or foreign matter
on the contacting face of the sealing parts is
kets and then dripping off in the hands of the >
which fits upon and closes one end of a discharge
tube 43 when the handle is in closed position,
_user during the pumping strokes.
as shown in Fig. 5. `
In the present invention this objection has
The opposite end of the discharge tube 40 is
been overcome by having the helical compression 20
rigidly mounted in the inwardly projecting end
spring, which compresses the rod gaskets, fit
of the nozzle fitting 1 with the opening -there
tightly around the rod, so that it acts as a re
through communicating with the discharge open
siliently gripping fluid stripper. Due to they yield
ability of the spring, it may have a snug fit * ing 3, the tube 40 being concentrically disposed
around the rod, but will not freeze thereto by cor 25 within the piston rod I4 and in spaced relation
The inner end of the sleeve I2 is interiorly
In the construction shown in the drawings, a
threaded to receive the exteriorly threaded axially
cylindrical reservoir 5 has an integrally formed
extending sleeve portion 4| of a fitting 42 which
lower end 6 in the center of which is brazed or
otherwise rigidly secured a nozzle fitting 1, having 30 is provided with an oppositely extending cylin
drical sleeve Jportion 43 which has a free sliding
an axially disposed discharge opening 3 formed
fit on the piston rod I4. The> space between the
piston rod I4 and the sleeves I2' and 4I is pro-A
` The upper end of the reservoir is closed by a
vided‘at its upper end with a felt gasket 44, a`
cap 9 brazed or otherwise sealed thereto in which
is a filler opening with screw closure plug, not 35 cork washer |45, and `a brass washer 45 bearing
thereagainst. 'I'he gasket 44 is’constantly urged
shown, in the usual manner of fire extinguishers
in compression> around the piston rod I4 by a
of this character. The cap 3 has an annular
helical compression spring 46, which snuglysur
collar or sleeve portion Iii, extending axially
outwardly and having. an axial opening there- ' rounds and yieldingly grips the rod I4, so as to
through, and a cylindrical skirt portion I2 which 40 strip the -fire extinguishing fluid from the rod
during reciprocation thereof; One end of the
extends axially inwardly from the cap. The
compression spring 46 bears against the washer
opening through the sleeve III has anv easyl work
45-and the other end thereof bears against a
ing fit with a piston rod I4 which is slidable
similar but smaller washer 41 which fits against
therethrough. The outer axial face of thesleeve
II forms a sealing face I3 which coacts with an 45 a felt gasket ring 43 disposed at the other end
`oi? the- space, thus providing a double yielding
annular ring gasket I5 carried by an annular
sealaround the piston rod which is automatically .
sealing member f6 which is rigidly brazed or
tensioned at all times and which prevents sub
otherwise secured to the piston rod I4. 'I'he
stantial leakage of fluid around the piston rod
member I6 comprises an axially extending cylin
drical skirt portion I1 which embraces and'car 50 during its reciprocation when subjected to pump- ing action.
ries the gasket I5,- and an oppositely extending
The piston rod I4l is surrounded by a pumping
cylindrical sleeve portion I3, the axial end of _
cylinder 49, one end of which is ñxed to a ro
which terminates in an exteriorly threaded end
tatable head 50 and the other end of which isr
I9, A handle 23, having an axially extending
hollow shank 2|, is threaded on the end I3 in 55 similarly fixed in a rotatable head 5I. A por
tion of the lower end of the pumping cylinder 43
abutting relationship against a shoulder of the
adjacent to the head 5I is of enlarged diameter,
sleeve I3, to limit and position the parts.>
as indicated at 52, and constitutes one of the
An axially slidable sleeve 22 surrounds the an
main features of the present application. The
nular sealing member I 6 and piston rod I4 in
spaced relation thereto and the upper end is pro 60 lower end of the piston rod I4 is exteriorly
ing flange Á23 which is freely slidable on the
sleeve portion I3 of the annular sealing member
threaded and has screwed thereon the interiorly
threaded end 53 of a tubular nipple 54. The nip
ple 54, adjacent the end 53, has an annular
I3. A helical compression spring 24 is provided
shoulder 55 which serves as one limit stop for an
vided with a radially disposed, inwardly extend
in the space between the fixed sleeve I3 and the 65 axially slidable piston 56 which is carried on the
nipple 54. The piston 56 is looselyl retained on
slidable sleeve 22 and bears between the sealing
the nipple 54 by an interiorly threaded cap 51
member I6 and the flange 23 of the sleeve 22.
which is` screwed on to the exteriorly threaded
'I'he lower end oi' the slidable sleeve 22 is pro
lower end of the nipple 54 and which carries a
>vided with diametrically opposed radially ex
tending lugs 25 and 23 which have cam surfaces 70 packing 53 therein retainedÍ by a thin washer 53.
The circumferential working face of the piston
on their upper axial faces for`interengaging with
flange portions 21 and 23 integrally formed on
the cap 9, openings 23 and 33 being provided
in the flange through which the lugs may enter
in the usual manner of bayonet connections,
33 is provided with an outwardly presenting pe
‘ ripheral groove which carries a pair of yielding
or resilient felt packing rings 60. 'I'he sizes of
the-piston 55, packing rings 60, enlarged cylin
der ene i: and cylinder as are such marine
reservoir into the tube 12 and heads 50 and 5I.
The laterally extending weight arm of the head
5I is also provided with a radially extending port
packing rings Il are compressed and have a snug
, working tit in the smaller diameter of the -pump
ing cylinder 49 and are free from radial compres
sion and have clearance from» the walls of the
‘l1 controlled by a ball lcheck valve 18 which pro
' vides communication between the passageway 13
enlarged portion 52 of the pumping cylinder.
Means are provided for admitting fluid _from
and the lower end of the pumping cylinder 49.
The head Il at its lower end is in slightly
spaced relation to the discharge tube 40 and is
the pumping cylinder 49 into the hollow piston
rod I4 from whence it can pass into the upper
end of the discharge tube 40 and thence out
» provided with a relatively thin brass washer 19,
the inner edge of which rides upon the tube 40
through the discharge nozzle opening 9 and
'and serves as a bearing for the head 5| which -
comprise apertures 9| a'nd 62 in that part of the
nipple B4 which is surrounded by the piston 59.
has relatively little friction and thus permits free ,
rotation of the head with respect to the tube 4i).v
A felt packing gasket 89 is interposed between
The apertures are s_o positioned that on the up
stroke of the piston rod the piston, when resting- 15 the axial face of the washer 19 and the opposed
against the axial end face of the nipple Sl, will'
Y axial face of the discharge nozzle`ilttlng 'l .for
uncover the openings 9| so that fluid may pass
preventing substantialY leakage of ñuid thereof,
`thereinto, and upon the downstroke, when the
it being understood that when the piston rod is
piston is abutting against the shoulderv 55, Aas
pushed downwardly, as viewed in Fig. V1 of the
shown in Fig. 4, the iluid will enter through the 20 drawings, the friction betweenA the piston pack-A
apertures 62. A by-pass port 63 is provided for
ing 69 and interior wall of the pumping cylinder
permitting part of the fluid within the hollow
49 will tend to slide the entire suction unit, com
piston rod to pass back into the pumping cylin
prising vthe heads 50, and 5i and pumping cylin-l
der ‘49 to- help iìll the same on the downstroke of
der 49 and suction tube 12, downwardlyl against
the pump when the suction from-the reservoir 25 the packing 90 and tightly compress it so as to
may not quite-lill the pumping cylinder 49.
prevent leakage of iluid. Likewise during theA
The head 50 which supports the upper end of `
thepumping cylinder 49 is provided with a felt
packing ring or gasket 94 which is` retained by a
relatively thin brass washer 65 secured on an
annular radially extending seat by rolling over
vthe metal at the edge of the opening which re
ceives the washer, as shown at 69. vThe inner
edge of the washer 65 rides upon the outer sur
face of the axially extending sleeve portion 43
>which serves as a bearing for supporting the
upper` end oi the suction mechanism and which
bearing, having relatively small metal to` metal
upstroke, the entire suction assembly Willmove
axially upwardly and thereby cause the axial end
, face of the sleeve 43 to compress the packing
ring 54 and prevent leakage at this point of the
fiuid entrapped within the- pumping cylinder 49.
In the operation of` this ñre extinguisher, ther
reservoir 5 is ñlled with fire extinguishing fluid
through an opening in the head 9 (not shown)
in the usual manner. During non-'use of the fire
extinguisher- the cam lugs 25' and 26 are engaged
under the inturned flanges 21 and 29, thus com
pressing the helical spring 24 between the radi
contact, will have a minimum of tendency to
ally extending inturned flange 23 and the annu- ’
stick and present very little friction to rotation 40 lar sealing member I9 which is brazed to 'the'
of the head, thus providing a structure which
piston rod i4, thus compressingthe gasket I5
will have freedom from freezing by reason of
between the sealing member i6 and the outer
corrosion or the like.
The head 50 is provided with a laterally ex
tending weighted arm having passageways there
through with ball check‘valves which serve as
suction ports for the pumping cylinder. 'I'he
upper end of the cylinder 49 communicates with
a radially extending port 61 controlled by ball
valve 69 which leads to an axially extending
passageway 99, _one end of which is controlled by
a ball check valve 19 and which in turn com
municates with a second radially extending port
1|, the outer open end of which lies closely ad
jacent to the inner peripheral wall of the reser
voir 5. The end of the passageway 69 opposite
to the ball check valve 10 communicates with
anaxially extending tube 12, the upper end of
which is rigidly secured in axial alignment there
axial face i3 of the sleeve Il. Thus a ñuid tight
)fr eil'ective seal is maintained at all times which
. will prevent leakage or evaporation of the fluid
within the reservoir past or through the opening i
in the sleeve Il around the piston rod i4, ,
When the handle is in the foregoing described
closed and sealed position, the lower face 39 of
:30 the ñoating seal 98 is tightly pressed against the
upper end of Idischarge tube 40 by the helical
compression spring 31, thus preventing any leak
age or evaporation of fluid through the discharge Q
tube 40 and nozzle opening 9 of the apparatus.` ,
When it is desired to operate the ñre extin
guished, the reservoir portion 5 is grasped in one' v
hand and the handle 20 in the other, and the
handle rotated relatively to the reservoir until
the cam lugs 25'and 26 are in registry with the -
with, and the opposite end of which is similarly 60 openings 29 and 30 between flanges 21 and 28,
secured to and communicates with an axially
at which time the handle carrying the piston rod
extending passageway 13 formed in the laterally
I4 may be withdrawn or pulled out axially from
extending weight arm of the head member 5|.
the head endof the nre extinguisher.
The lower end of the passageway 13 is likewise
Inasmuch as the felt piston packing rings 6l)
vprovided with a. ball check valve 14 which con
have been i`n the enlarged end 52 of the pumping
trols communication between the passageway 13
cylinder 49 during non-use of the i'lre extinguish
and a radially extending port 15, the outer open
these packing rings will have remained their
end of which lies closely adjacent to> the interior
original size, and when drawn up into that part
wall of the cylindrical reservoir 5._
n ,
of the pumping cylinder 49 having the smaller
A metal rod 19 is housed within the tube 12 70 diameter, will make a tight ñt therein which will
and-functions to tap the ball check valves 10 or
prevent slippage of iluid past the piston. The
14 oiï of their respective seats when the fire -ex-piston 56 is-made of smaller diameter than the
tinguisher is inclined either upwardly or down
diameter of the pumping cylinder 49 Il
wardly, as the case may be, thus insuringfree
communication for the passage of iluid from the 75 so as to not make metal to metal contact there
with and the piston will be held centered within
the pumping cylinder by the packing rings 69.
During> the upstroke of the piston rod, the
piston 56 will ride upon the axial end face of the
nipple 51 thus uncovering the openings 6I and
permitting ñuid from the pumping cylinder 49 to
pass through said openings into the hollow pis
ton rod I4, thence upwardly toward the handle
and into the open upper end of discharge tube
ing rings 69, being free from compression duringy
such periods of non-use, will make a tight seal
ing llt with the interior wall o_f the pumping cyl
indexl 49 when drawn up into the smaller diame-v
ter portion thereof which is the substantial
pumping length of the cylinder.
It will also be equally evident that when the
handle 29 is forced downwardly so as to compress
the spring 31, the floating seal 38 will effectively
40 which has been uncovered and unsealed by
close the upper end of the discharge tube 49 and
withdrawal of the handle 29. During this up
prevent evaporation or leakage of the fluid there
ward stroke of the piston the ñuid which is in
into. When the cam 1ugs'26 and 26 are rotated
the pumping cylinder 49 is prevented from pass
underneath the flanges 21 and 28, the sliding
ing out around the piston rod I4 through the
head 59 by reason of the stripping action of the ` sleeve 22 will'movev axially downwardly toward
spring 46 and ther resilient felt packing rings 44, 15 the head 9, as shown in Fig. 1 of the drawings,
thus compressing the spring 24 which'yieldingly
48 and 64. During such upward stroke fluid is
holds the annular sealing member I6 and. gasket
drawn into the lower end of the pumpingcylin
I5 tightly upon the sealing face I3 offthe sleeve
der 49 through the port 11 around the ball check
valve 18, it being understood of course that fluid , member II.
is drawn in andfills the passageways 69, tube 20 It is to be particularly noted that during this
latter closure, the sealing member I6 carrying
12, and passageways 13 either through the radi
.the packinggasket I5 is not only axially com
ally extending ports 1I or 16 depending upon the
pressed on its cooperating sealing seat, but by
position of the nre extinguisher. If the discharge
reason of the member I6 being secured to the
end of the extinguisher is pointed down, then
the ball check valve 19 will rest upon its seat, 25 piston rod`I4 and hence rigid with the handle
29, the contacting surfaces of the sealing mem
as shown in Fig. 1 of the drawings, and the rod
bers are rotated with respect to each other, thus
16 will tap the ball check valve 14 off of its seat
grinding out any dust or foreign matter which
and Athus open communicationthrough the in
may be on their contacting faces and effecting a
take port 16. Conversely, if the discharge end
of the extinguisher is pointed upwardly, the ball 30 superior seal at this point somewhat analogous
to a rotated grinding fit. of the contacting faces.
valve 14 will rest upon its seat and the rod 16
_ The cylindrical sleeve portion I2 is provided
will tap the ball check valve 19 off. of its seat
a plurality of axially extending slots or
and thus provide suction opening through the
notches 99 through which the fluid that is
When the piston has reached the upper limit 35 stripped from the piston rod I4 may return to the
- interior of the reservoir.
of its stroke it is then forced downwardly by
Although but one specific embodiment of this
pushing in of the handle 29 at which time the
invention has been herein shown and described,
axially slidable piston 56 abuts against the shoul
it will be understood that numerous details of
der 55 of the nipple threaded on to the end of
the piston rod I4 and thus opens communication 40 the construction shown may be altered or omit
ted without departing from the spirit of this
to the interior of the piston rod I4 through the
invention as defined by the following claims.
radial ports 62. As the fluid is forced into the
hollow piston rod I4 and thence out through the
1. In a ilre extinguisher, a pumping cylinder,
discharge'tube 49 a portion of it is by-passed
a piston reciprocable in said cylinder for expell
through the port 63 and into the pumping cylin
ing fluid from said extinguisher, said piston hav
der' 49 back of the piston so as to help i‘lll the
ing a groove in its circumferential face and felt
pumping cylinder‘on the downstroke, as it has
packing rings in said groove, said cylinder having
been found that during thisY downstroke, it is
a portion of enlarged diameter and »the relative
at times desirable to supplement the ñuid being
of said cylinder, piston, and packing .rings
brought in -through the port 61 around the check
being such that said packing rings are under
valve 68.
compression when said piston is in the smaller
During the downstroke of the piston, the fric
diameter of said cylinder and are relieved of
tion between the packing rings 694 and interior
compression when said piston is in the larger
Wall of the pumping cylinder 49 carries the en
_of said cylinder.
tire suction assembly axially downward, as 55 diameter
2. In a fire extinguisher, a pumping cylinder,
viewed in Fig. l, so as to compress the gasket 89
a piston reciprocable in said cylinder for expell
and thus prevent leakage of fluid from the lower
ing fluid from said extinguisher, said piston hav
endl of the pumping 'cylinder around the dis
ing a relatively close working fit within said cyl- »
charge tube 49 which would otherwise occur by
said cylinder having a portion thereof of
reason of the substantial clearance between the
larger diameter than the remainder thereof, said
outside of the discharge tube and the head 5I
piston being normally positioned in said enlarged
through which it passes.
portion during non-use of said extinguisher and
From the foregoing, it will be clearly evident .
having suil‘lcient clearance with respect thereto
-that it will be impossible for the piston ‘66 to
become frozen to the interior wall of the pumping 65 to prevent the corroding together of said piston
and cylinder during periods of non-use.
cylinder 49 during long periods of non-use of the
fire extinguisher, and furthermore that the pack
port 1I.
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