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Патент USA US2112651

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March 29, 1938.
c_ H, Fox
2,112,651
CENTRIFUGAL PUMP
Filed Sept. 19, 1935
8 Sheets-Sheet l
nfnvaw?rv
CHARLES H. Fox,
7
=1
-March 29, 1938.
Q H, FOX
2,112,651
CENTR IFUGAL PUMP
Filed Sept. 19, 1935
4‘
_
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8 Sheets-Sheet 2
March 29, 1938.
c. H. FOX
2,112,651
CENTRIFUGAL PUMP
Filed Sept. 19, 1935
_8 Sheets-Sheet 3
4
(“76.3.
J'mvvwéo'b
CHARLES H. FOX,
Mani-h 29, 1938.
C. H. FOX
2,1'125651
'
CENTRIFUGAL 'PUMP
Filed' Se-pt‘. 19, 1955
8 Sheets-Sheet 4
mm
a.
E
Nm.
mm
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March 29, 1938.
2,112,651
c. H. FOX
CENTRIFUGAL PUMP
Filed Sept. 19, 1935
F7618.
8 Sheets-Sheet 6
1
67
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CHARLES ".FOX,
Guam
March 29, 1938.
c. H.‘FO_X'
. 2,112,651
CENTRIFUGAL ‘PUMP
Filed Sept. 19, 1935
516,10.
s Sheets-Sheet '7
March 29, 1938.
2,112,651
C. H. FOX
CENTRIFUGAL- PUMP
Filed Sept'. 19. 1935
FIG. 1 2.
Fifi/3.
8 Sheets-Sheet 8
Patented Mar. 29, 1938 I
v
UNITED STATES PATENT OFFICE
2,112,651v
CENTBIIFUGAL rum
Charles H. Fox, Cincinnati, Ohio, assignm- to The
Ahrens-Fox Fire Engine Company, Cincinnati,
Ohio, a corporation of Ohio
Application September 19, 1935, Serial No. 41,280
4 Claims. (Cl. 169—24)
This invention relates to ?re engines, and in through one of the pumps ‘shown in Figure 1,
particular, to power-operated pumping engines and taken along the line 1-1‘ of Figure 1.
wherein the pumping units consist of centrifugal
Figure 8 is a fragmentary side elevation of
pumps.
the right-hand side of the mechanism shown in
5
One object of this invention is to provide a ?re
trifugal pumps operated by independent driving
tra'nsmissions, but having their intakes and out-
tion of the mechanism shown in Figure 1, illus
trating the manner of operating the diversion
lets connected to a common source and a com-
valve.
bined in series or in parallel. '
\
Figure '10 is a side elevation of a_ ?re engine. 10
with the body and super-structure‘superimposed
upon the chassis shown in’ Figure 1, illustrating
Another object is to provide a pumping unit
of the type previously set forth, wherein each
15 pump consists of a centrifugal pump comprising
one or more stages. I
the positions of the various elements of the in
vention.
.
‘
_
Figure 11 is an end elevation of the auxiliary 15
pump employed in the ?re engine of this inven
Another object is to provide a ?re engine
pumping unit consisting of a pair of centrifugal
pumps, a power plant, independent transmissions' for driving each pump from the power
tion.
_
_
Figure 12 is a top plan view of the auxiliary
pump shown in Figure 11.
Figure 13 is a transverse section through the 20
plant, the pumps being capable of being driven
common intake conduit and the main suction
either individually or together, the transmissions
being arranged so that the pumps may be start-
chamber, taken along the line l3--l3 of Figure 6.
Figure 14 is a diagrammatic view of the several
ed selectively.
parts of the apparatus.
_
Another‘ object is to provide a pumping unit
One of the problems hitherto encountered in 25
composed of a pair of centrifugal pumps in a
the manufacture of ?re-?ghting equipment was
hydraulic Circuit. the intakes of the Pumps being
adapted to communicate with a source of supPly, automatic Valve means being arranged to
to provide a ?re engine which would be capable
of emeiently handling the varying requirements
of service. A ?re in a high building requires the
‘:0 cut off one of the intakes from such a source
when the outlet of the other pump is connected
in series with its intake, so as to operate the
two pumps in series to provide a maximum pressure delivery.
7
'
pumping of water ‘at high pressure. On the 30
other hand, a large ?re in a low building re- ,
quires the application of the maximum quantity
of water without the, necessity for high pres
sures.
Furthermore, the majority of ?res en
In the'drawingsl
. Figure 1 198- Plan View Of the chassis 01' the
?re engine of this invention, with the various
units'mounted thereon but with the body and 511perstructure removed in order to more clearly
countered and which the ?re engine is expected 35
to extinguish, are of a very small nature, in low
buildings or in situations requmng the applica
tion of small quantities of ?uid at low pressures.
Amodem ?re engine, however, in ordertomeet
40 disclose the Various mechanisms.
‘ Figure 2 is an irregular Cross Section through
the requirements of the underwriters, must be 40
designed to accommodate the maximum delivery
00
5
‘
Figure 9 is a fragmentary plan view of apor
10 mon exhaust, respectively, the pumps being capable of operation either individually or com-
.,
Figure 1.
engine pumping unit composed of a pair of cen-
the Pumping unit of Figure 1, taken aDPI'OXi- and the maximum pressure speci?ed by the regu
m?tely along the line 2-2 thereof.
lations. To accomplish this the present, in
Figure 3 is an enlarged fragmentary view of 'ventor has found that centrifugal pumps are
45 the diversion valve shown inv combination with suitable for pumping ?uid to extinguish large or 45
other elements in Figure 2, the valve being set high ?res. A centrifugal pump, however, is
to connect the two pumps in series.
Figure 4 is a view similar to Figure 3, but with
the valve set to connect the two pumps in par4 50 allel.
v
-
in
Figure 5 is an end view of the pumping unit
shown in Figure 1.
_
_Y
55
»
"
proportion , to
a
requirement
for
smaller 50
amounts of water, but must ‘be kept up to speeds
compatible with certain pressure requirements.
Figure 6 is a horizontal‘vsection taken along
the line 6-6 of Figure 5._ ,
somewhat in?exible in that it has an unavoidably
narrow range within which it operates emciently.
The centrifugal pump cannot be slowed down
'
Figure '7 is a longitudinal," vertical section
___i_
Furthermore, the present inventorhasfound that
small Jets of water are more satisfactory for ex
tinguishing small ?res than the jets of chemicals 56
.
1
2
2,112,651
previously employed. To reconcile all of these
varying requirements encountered in ?re-?ght
ing was the problem of the present inventor.
To solve this problem the present inventor
has provided a ?re engine having a pair of cen
trifugal pumps, together with a small auxiliary
the brackets |9. The right-hand main pump l5
(Figure 5) isprovided with‘ an intake conduit
29 (Figures 2 and 5), connected as at 2| to the
common suction chamber 48, as will appear later.
The intake conduit 20 leads into the casing of the
pump l5, as will subsequently appear. The ?uid
pumped by the ?rst stage of the pump is dis
pump. These pumps are provided with trans
charged into the first-stage volute 22, and thence
missions and power takeo?‘s of such a nature
'into the cross-over conduit 23, which connects
that either of the main pumps may be oper
the outlet of the ?rst-stage volute, as at 24, with 10
10 ated individually in order to most e?iciently ex
the inlet 25 (Figure 2) of the second-stage, as at
tinguish a ?re of medium size. ~ Both of the main
'
pumps may also be operated simultaneously, 26.
This ?uid is pumped by the second stage of
either in series .where high pressures are more
important than great volume, or else in parallel the pump l5 into the second-stage volute 21, the
latter being joined, as at 28, to the discharge 15
15 where a large volume delivery is more important
than a high pressure. The small auxiliary pump
leader 29. The latter is connected, as at 30, with
is arranged to serve as an exhauster for either
of themain pumps, or else as an additional pump
the common discharge header 3|.
for pumping small quantities of ?uid either from
which varyin number according to the pumping
capacity desired. These hose gates 32 are oper
a tank carried by the ?re engine or from an in
Attached to
the common discharge header are hose gates 32,
dependent source of supply, this being used for
ated by the handles 33 in order to control the
very small ?res where it would be inefficient or
?ow of ?uid into the various lines of hose con
costly to operate either of the main pumps.
Referring to the drawings in detail, Figure 1
shows the central portion of the ?re engine of
this invention in plan view with the body and
nected to these hose gates.
other super-structure removed. In this ?gure it
will be seen that the ?re engine has a frame with
side members I, upon which is mounted the
motor, generally designated 2, having a ?ywheel
housing 3 with side extensions joined to the
frame, as at 4. The Junctions 4 provide the re
quired points of support of the motor 2. To the
rearward side'of the ?ywheel housing 3 is joined
35 a clutch housing 5, which incloses a driving
clutch (not shown), whereby the two may be con
nected to the remainder of the mechanism. This
clutch is of a conventional type, and its details
together with the details of the engine, form no
40 part of the present invention.
Mounted rearwardly of the clutch housing
5 is the main transmission unit 6, consisting of a
standard selective type gear box having the usual
arrangement of gears to provide the speeds for
45 ward and reverse required for propelling the or
dinary vehicle. The main transmission unit 6 is
operated by a hand lever 1 in the usual man
ner, and serves to impart power to a pump drive
unit 3 attached to and connected with the main
50 transmission unit 6. ' The power from the latter
is applied in a manner subsequently to be de-,
The intake 34013 the left-hand main pump I6
is similarly connected‘, as at 35, to the intake 25
conduit I1, and the ?uid pumped by its first stage
passes into its ?rst-stage volute 36. The latter
is connected, as at 31, to the cross-over 38, this
being, in turn, connected, as at 39, to the second
stage of the pump IS. The ?uid delivered by
this second stage passes into the second-stage
volute 48, which‘ is connected, as at 4|, to the
diversion valve casing 42, consisting of a pro
jecting portion of the common discharge header
3|
The diversion valve casing 42 contains the
diversion valve member 43 (Figures 2, 3 and 4),
having ‘a passageway 44 therethrough. When
the valve member 43 is set, in the manner shown
in Figures 2 and 3, the discharge of ?uid from
the left-hand pump volute 48 passes through the
valve into the series branch conduit, generally.
designated 45. The latter consists of the conduit
sections 46 and 41, joined to one another at the
junction 49 (Figure 2). The series branch con
duit 45 is joined at one end, as at 50, to the di
version valve casing 42. At its opposite end it
is joined to the main suction chamber 48 (Fig
ure 6). The main suction chamber 48 terminates
in the automatic valve chamber 52. The auto
matic valve chamber 52 contains the automatic’
scribed, either to the propulsion of the vehicle
by way of the traction drive shaft 9, or else to
valve member 53, serving to close the port 54
the pumps, either individually or in combination
duit l1. The automatic valve member 53 is
pivoted at 55 to an arm 55, which in turn, is
pivoted around the shaft 51 and impelled into a
position closing the port 54 under the urge of
the spring 58. The intake conduit 20 of the
right-hand main pump l5, as previously stated,
is connected to the automatic valve chamber 52
55 through the right-hand pump driving connection
M, or through the left-hand pump driving con
nection ||. The universal joints l2 and I3 serve
as usual to transmit the power through the trac
tion drive shaft 9, under varying angles, to the
rear axle of the truck. The disc-type parking
brake |4 serves the usual purpose of locking the
main traction drive shaft 9.
The pump driving connections l8 and II are
joined respectively to a pair of main pumps,
the right-hand main pump being generally des
ignated l5 and the left-hand main pump l6.
Each of these pumps is substantially identical
with the‘ other, and a description of one will
leading therefrom into the common intake con
at the junction 2| (Figure 13) .
‘
The diversion valve member 43 (Figure 2) is
rotatably mounted in its casing 42 upon the shaft
59, this shaft carrying at its outer end the skew
gear 68. ‘The latter meshes with a pinion 6|
mounted upon the shaft 62 and journaledin bear
ings 63. The opposite end of the shaft 62 is pro
vided with a hand wheel 64. By manually ro
tating the hand wheel 54 the position of diversion
su?ice.' The details of these main pumps are
70 shown inv Figure 'I and will be described later. - valve member 43 may be varied to connect the 70
The left-hand main pump I6 is connected to'a main pumps I5 and I6, either in series or in
common intake conduit -|1 (Figure 5), which parallel. . .
As previously stated, the main pumps I5 and
terminates on opposite sides of the frame in the
I6 are operated independently from the power
intake ports l9. The intake conduit I1 is se
75 cured to the frame members | by means of supply. The main pump I5 is operated through 75
I
_
.
.
3
2,112,661
the right-hand pump driving connection I8 from
the pump drive unit 8 (Figure 1). The left-hand
main pump I6 ‘is similarly driven independently
from the left-hand pump driving'connection II,
also connected to the pump drive unit 8. The
pump drive unit 8 ,contains sliding gears which
are movable in a conventional manner to connect
the main transmission unit 6 with either or both
I8 I , which leads to the casings of the main pumps
I5 and I6. The remaining connection of the
three-way valve 9'! leads to the pipe I82, which
terminates in the hose connection I83. By
suitably moving the valve handle 98 the aux
iliary pump 88 may be caused to create a suc
tion, drawing in water from the tank I88, or
else to create a suction in the casings of the
main pumps I5 and I6, thereby setting up the '
initial draft necessary to cause these pumps to
The
gear
shifting
for
this
purpose
is
accom
.10
plished by rotating the shaft 65 through the ' operate or ?nally to draw in water from the
of the pump driving connections I8 and II.
agency of the hand lever 66 mounted thereon.
The hand lever 66 engages a quadrant 61 having
five notches 68, 69, ‘I8, ‘II and ‘I2 therein (Figure
15 8). By shifting the lever 66 into one of these five
notches, as will be explained later, the power
from the engine may be connected selectively to
the chassis drive shaft 9, to the right-hand pump
I5, to the left-hand pump I6, or in a neutral
20 position. The gears in the pump drive unit 8 are
prevented from clashing during this shifting by
the operation of a vacuum-actuated device 13,
which disconnects the clutch within the clutch
housing 5 through the connecting arm ‘I4 (Figure
25 1) whenever the lever 66 is shifted to a new po
sition.
The main clutch may be released manually by
the operator by means of pressure applied to the
clutch pedal ‘I5 (Figure 1). The brakes of the
30 ?re engine are applied by pressure upon the brake
pedal 16, assisted by the master brake cylinder
11 and the master brake vacuum cylinder ‘I8.
The parking brake I4 is applied by operating the
hand brake lever 19, (Figure l) in the ordinary
35 manner. The details of the braking and clutch
system, as described above, form no part of the
present invention.
-
' ‘
. An auxiliary pump 88 of the positive displace
40
ment type (Figure 1) is driven from the shaft
8i emerging from the auxiliary pump power take
off 82, the latter being connected to the main
transmission 6. The auxiliary power pump take
off 82, of a conventional type the details of which
form no part of the present invention, is operated
to connect or disconnect the auxiliary pump 88
from the source of power by shifting the auxiliary
pump hand lever 83 (Figure 1). The latter is
mounted upon the shaft 84, which is journaled in
the casing of the pump drive unit 8 and carries
at itsiopposite end an arm 85. The latter is con
nected by the connecting rod 86 to an arm 81,
mounted upon the auxiliary pump control shaft
88. The latter serves to operate clutch means
within the auxiliary pump power take-off 82 to
connect or disconnect the auxiliary pump 88 from
the power source.
'
The auxiliary pump 88 (Figures 11 and 12) is
of a conventional type, the details of which form
no part of the present invention.’ This pump
CO comprises a casing 89 having end plates 98 and
9| secured thereto as by the 'cap screws 92. The
upper side of the casing 89 is provided with a
hose connected to the hose connection I83, this
hose being connected to a hydrant, pond or other
external source of supply. The outlet pipe 96 of
the auxiliary pump 88 leads to the hose connec
tion I84. The latter serves for the connection
of a small hose which may be used for extin
guishing small ?res, the ?uid being supplied by
the pump 88.
. The main driving pumps I5 and I6 are of the
20
two-stage centrifugal type shown in longitudinal
section in Figure 7. The details of these pumps
in themselves form no part of the present inven
tion, hence, a brief description will suffice. The
right-hand main pump I5 is chosen for purposes 25
of description, although it will be understood that
the left-hand main pump I6 might be similarly
described.
As previously described, the main pump I5 is
provided with an intake conduit 28, leading to the 30
casing I 85 (Figure '7). The latter is provided
with a pair of interior chambers, namely, the
?rst-stage chamber I86 and the ‘second-stage
chamber'ln‘l. Surrounding these chambers I86
and I8‘! is a water jacket chamber I88. The 35
chamber I 88 is connected to the radiator or cool
ing system of the motor 2 so that the ?uid pass
ing through the pump is utilized to assist the
cooling system of the motor in warm weather,
and the warm water from the radiator is utilized 40
to keep the pumps from freezing in cold weather.
The details of this‘ cooling and warming system
form no part of the present invention, but are
contained in my copending application, Ser. No.
45
27,404‘, ?led June 19, 1935.
The pump casing I85 is provided with end
plates I89 and H8, each of these having bores
I I I and I I2, respectively, serving to receive pack
ings H3 and H4, surrounding sleeves H5 and
'I I6, respectively. Passing through these sleeves 50
is the pump drive shaft “1 having the end por
tions H8 and H9 thereof rotatably supported
by the anti-friction bearings I28 and I2I, respec
tively. The driving end‘ adjacent the bearing I28
is provided with a universal ‘or self-aligning con
nection, generally designated I22, which serves
to compensate for slight changes in alignment or
slight errors in assembly.
The packings H3 and x '
II4 may be compressed to prevent leakage by
turning the glands I23 and I24, respectively, 60
these being locked in their adjusted positions by
the latch members I25 and I26, operating in the '
junction 93 arranged for connecting the auxiliary
notches I21 and I28.
pump intake pipe 94 thereto. The opposite or
bottom side of the auxiliary pump 88 contains a
similar junction 95, to which is connected the
splined portions I29 and I88, (Figure '7) upon»v 65
auxiliary pump outlet pipe 86.
The auxiliary pump intake pipe 94 leads to the
three-way valve 91, having an operating handle
98 (Figure 14). From one of the three connec
tions on the opposite side of this valve the pipe
' 99 leads to the tank I88. This tank is arranged
‘
The‘ drive shaft III is provided with a pair of
which are mounted the rotors of'the pump. The
?rst-stage rotor I3I is mounted upon the splined
portion I38 and is provided with a plurality of
radially directed arms having passages I32 there
through. The outer ends of these passages I32 70
open into the chamber within the first-stage
volute 22. This volute is connected at the'junc- ,
to contain’water, somewhat over one hundred‘ tion 24 to the cross-over 23, which leads to the
second-stage volute 21 in the manner previously
' gallons in quantity. vThe middle connection of
75 the three-way‘valve 91 is connected to the pipe
described.
,
v
75
~——
4
2,112,651
The second-stage rotor I33 is similar in form
to the ?rst-stage rotor I3I but is secured to the
splined portion I29. Its outwardly directed pas
from its second-stage volute 21, through the dis
charge leader 29 into the distributing header 3|
(Figure 1). At the same time the left-hand
sages I34 are curved in a direction away from
the passages I32 so that the thrusts thereof tend
main pump I6 discharges its ?uid from'its sec—
to react upon one another and compensate for
passage 44, set in the position shown in Figure 4,
end thrust.
The outer ends of the second-stage
rotor passages I34 open into the chamber. within
the second-stage volute 21.
The latter is con;
10 nected at the junction 28 to the discharge leader
28 (Figure 1) and this, in turn, is connected to
the distribution header 3| in the manner pre
viously described.
The pump‘ drive shaft II'I receives power from
15 the pump driving connection III, through the tub
ular drive shaft I35 thereof by way of the uni
versal joint I 22.. The rotation of the ?rst and
second-stage rotors I3I and I33, respectively,
causes the ?uid to be thrown outwardly into the
?rst and second-stage volutes 22 and 21, the ?uid
passing onward under pressure thus created.
The traction drive shaft 8 receives bearing
support through the agency of a bearing assem
bly I48, supported by the intake header I ‘I by
25 means of the right-angled bracket I 4| secured
thereto (Figures 1, 5 and 8). In this way the
intake header I'I serves to support not only one
of the pumps, but also the drive shaft 9.
v
In the operation of the valve mechanism, to
30 connect the main pumps I5 and I6 in series so
that the maximum pressure will be obtained,,the
diversion valve member 43 is rotated by the hand
wheel 64 into the position shown in Figures 2
and 3. In this position the ?uid is drawn into
35 the left-hand main pump I6 through its intake
conduit 34 from the common intake conduit IT.
This ?uid is placed under pressure by the pump
and is discharged from the second-stage volute
thereof into the diversion valve chamber 42 (Fig
40 ure 2).
The ?uid passes .through the diversion
ond-stage volute 40 through the diversion valve
into the distributing header 3|.
The separately
pumped‘ quantities of ?uid thus unite in the dis
tributing header 3| and are distributed to the
various hose lines by way of the hose gates 32. 10
Thus by suitable manipulation of the hand wheel
64 the diversion valve member 43 may be rotated
to place the main pumps I5 and I6 in series to
produce the maximum pressure at a ‘sacri?ce in
volume, or to produce the maximum volume de 15
livery at the sacri?ce of pressure. This altera
tion may be made in accordance with the con
ditions encountered in the particular ?re.
It will thus bev seen that the pump drive unit
8 and the pump driving connections II) and II 20
are arranged in such a manner that the shift
ing of the hand lever 66 causes both pumps to
be operated, either individually or collectively.
The pump drive unit 8, however, is vso arranged
as to prevent the simultaneous starting of both of 25
the main pumps I5 and I6, and to permit these
pumps to be started only in succession to one
another.
In the operation of the mechanical driving con
nections of the main pumps I5 and I6, when the 30,
lever 66 is shifted into the ?rst notch 68 (Figure
8), power from the main transmission 6 is trans
mitted through the traction drive shaft 9 and the
universal joints I2 and I3 to the rear axle of the
truck, thereby propelling the truck. With the 35
lever 66 in the second notch 69 the drive connec
tion is broken between the traction drive shaft
9 and the main transmission 6, thereby nullify
ing the transmission of power for the purpose
of propelling the truck, yet permitting the trans
mission of power to the pump driving units.
With the lever 66 in the third notch ‘III the
pump driving connection III is operatively con
nected to the main transmission 6 through the
4.0
valve passage 44, the series branch conduit 45
and the automatic valve chamber 52, upwardly
into the intake conduit .20 of the right-hand main
pump I5 (Figures 6 and 13). The ?uid, which
is already under pressure from the left-hand pump drive unit 8, thereby placing the right 45
main pump I6, is furthersubjected to pressure hand main pump I5 in operation. With the le
ver 66 in the fourth notch ‘II, both 01' the pump
in the right-hand main pump I5, and passes out
wardly therefrom through the discharge leader . driving connections III and I I are placed in com
29 into the distributing header 3I. The ?uid is munication with the main transmission 6
through the pump drive unit 6. This causes b'oth 50
50 distributed from the distributing header 3|,
through the hose gates 32, into the various lines pumps to be placed in operation. With the lever
66 in the ?fth notch "the right-hand pump
of hose by turning the valve handles 33 in a con
allel, whereby to obtain the maximum volume of
connection III is placed out of operation, and the
left-hand pump connection I I placed in operative
communication, with the transmission 6 through 55
delivery of ?uid, the hand wheel 64 is rotated so
that the diversion valve member 43 is set in the
hand pump I6 alone to operate.
ventional manner:
v'I‘o connect the main pumps I5 and I6 in par
position shown in Figure 4, thereby cutting off
the series branch conduit 45 from communica
the pump drive unit 8.
This causes .the left
‘
When the lever 66 is shifted it passes through
a neutral zone.
Coincident therewith the driv
ing clutch within the clutch housing 5 is released 60
60 tion with the left-hand main pump I6 (Figures 2
and 4) . With the.valve set in this position both I by the force of the vacuum-actuated device ‘I3,
of the pumps I5 and I6 take in ?uid independ
ently. The right-hand main pump I5 draws in
?uid through its intake conduit 28 from the auto
65 matic valve chamber 52, the automatic valve
as previously explained. Consequently, the shift
ing through the various positions is effected with
out clash of the gearing, and when the lever 66
member 53'opening inwardly (Figure 6) against
closed, communicating power from the engine to
the urge of its spring 58, to permit ?uid tapes
from the common intake conduit I‘I through the
port 54. ‘At the same time the left-hand main
the main transmission 6.
reaches a. new notch the drive clutch is thereby 65
_
charges these, each through its ownvolute. The
It will be observed from the foregoing dis
closure that the pump driving connections I8
and/or II may be operated either simultaneous 70
ly with the truck driveshaft 8, as well as inde
pendently thereof and independently of one an
other. This result is effected through the shift
ing of the hand lever 66 into the five notches 68
75 right-hand main pump. I5 discharges its, ?uid
to ‘I2, previously discussed. At the same time 75
70 pump' I6 draws in .g?uid from the same’ intake.
conduit I] through its intake conduit 34.
Each of the pumps I5 and I6 places 'the sepa
rate quantities of ?uid under pressure and dis
5
9,118,651
it will be obvious that the ‘shifting of the lever
83 may likewise be controlled to cause the power
take-off l2 and the auxiliary pump 00 to be op
erated from the main transmission i while the
truck is either stationary or in motion. Conse~
quently, the pumping units of the ?re engine may
be operated either while the engine is station
ary or in motion. This enables the use of the
' ?re engine in extinguishing ?res which must be
10 followed up, such as grass or brush ?res.
It will be understood that I desire to com
direction of flow from the outlet of the ?rst pump _
and adapted to prevent ?ow out,’ of the intake of
the second pump.
3. In a ?re engine, a pair of major centrifugal
pumps having intakes and outlets, an auxiliary
pump, a tank, transmission mechanism for ap
plying power selectively to said pumps either in
dividually or collectively, valve means for selec
prehend within my invention such modi?cations
tively connecting said auxiliary pump to exhaust
from said major pumps or to withdraw ?uid from
as some within the scope of my claims and my
said tank, diversion valve means and a cross con
10
duit associated therewith extending from the
outlet of one of the major pumps to the intake 15'
I claim as new and desire to secure by Letters of the. other major pump to connect the discharge
Patent, is:
.
of said major pumps in series or in parallel,
1. In a ?re engine, a major pump, a tank, an and check valve means arranged to control the
auxiliary pump, means for selectively, connect
direction of ?ow from the outlet of the ?rst pump
ing said auxiliary pump to exhaust from said and adapted to prevent ?ow out of the intake of 20
major pump or to withdraw ?uid from said tank, the second pump, and control means for said
and power means for selectively applying power transmission mechanism and said diversion valve
to said major pump or to said auxiliary pump in
means arranged in close proximity to one an
invention.
15
of said major pumps in series or in parallel,
and check valve means arranged to control the
.
Having thus fully described my invention, what
dividually or collectively.
2. In a fire engine, a pair of major centrifugal
pumps having intakes and outlets, an auxiliary
other, whereby to facilitate the control of said
pump, a tank, transmission mechanism for ap
plying power selectively to said pumps either in
bers, a tank mounted above said frame members,
a pair .of major pumps mounted between said
dividually or collectively, valve means for selec
frame members, an auxiliary pump below said
tank, and means for selectively connecting the
30 tively connecting said auxiliary pump to exhaust
from said major pumps or to withdraw ?uid from
said tank, diversion valve means and a cross
conduit associated therewith extending from the
outlet of one of the major pumps to the intake
35 of the other major pump to connect the discharge
?re engine from a single station.
'
'
4. In a tire engine, longitudinal frame mem
30
inlet of the-auxiliary pump to the major pumps
to cause the priming of the major pumps or to
said tank to withdraw ?uid therefrom.
CHARLESEFOX.
35
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