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G. E. GALL
2,407,9923
PUMP
Filed Jan. 31, 1944
Y
5 Sheets«Sheet l
@naga
Sept. >117, 1946..
_
Q_ E GALL
PUMP
Filed Jan. 3l, 1944
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2,407,923
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3 Sheets-Sheet 3
Patented Sept. 17, 1946
2,407,923
UNITED STATES PATENT OFFICE`
2,407,923
PUMP
George E. Gall, Chicago, Ill., assignor to Anker
Holth Manufacturing Company, Inc., Chicago,
Ill., a corporation of Michigan
Application January 31, 1944, Serial No. 520,391
7 Claims.
1
This invention relates to a pump, and more
particularly to a hydraulic pump for delivering
liquid under pressure. The pump may be used
for operating hydraulic cylinders to furnish pow
er for various appliances, and can be utilized
wherever it is desired to supply hydraulic pres
sures.
(Cl. 10S-10)
2
The pump body and caps may be formed of cast
ings of any suitable metal.
1
' A drive shaft I4 extends through the structure,
being journaled in the bearing I5 in the front
cap I I and driven by any suitable source of power
such as the electric motor I1 shown in Fig. 1.
‘
Inside the front cap I I, and shown more clear
An object of the invention is to provide a pump
ly in Fig. 4, is a low pressure pump section A
which will deliver liquid at high pressures when
which includes the gear I8 mounted on the shaft
high pressures are required for the work being 10 I4. Located above and in meshed relation‘with
done, and which will develop these high pressures
gear I8 is a second gear I9 mounted on shaft 20
without the objectionable pulsations or vibra
which has its one end journaled in the bearing 2I
tions which are commonlyassociated with such
carried in the body I0 and which has'its other
operation.
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end journaled in the bearing 22 carried in the
Another object of the invention is to provide
front cap I2.
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a pump of this character which is capable of
A passage 23 leads from an opening ,24 in the
developing very high pressures, but which at the
top of the pump body Il] to the gears I8 and I9.
same time will deliver liquid at a rapid rate dur
A second opening 25, which is in the side of the
ing periods of operation in which high pressures
body Ill, also communicates with the passage 23.
are not required, so that an overall operation in 20 One of the openings 24 and 25 may be plugged and
volving periods of low pressure operation and pe
the other may be connected ‘by conduit with any
riods of high pressure operation may rbe per
suitable source of liquid.
formed in a minimum of time. A further object
When the pump section A is in operation, with
is to provide a pump capable of quickly delivering
the shaft I4 turning in a clockwise direction as
the liquid necessary for performing an operation 25 seen in Fig. 4, the »gears I8 and I9 function un
which requires high liquid presures, at least dur
ing some periods of the operation, while at the
same time keeping to a minimum the power re
quired to actuate the pump.
»
der well-known principles to draw liquid from
the passage 23 and pass it between the gears and
on through the passage 26.
Passage 26 communicates with passage 2l lead
Another object is to provide effective means for 30 ing rearwardly in the body IU (shown in dotted
cutting off the delivery of liquid delivered by the
lines in Fig. 2), and passage 2'I communicates
pump under high pressure while the pump re
with the passage 28 which leads upwardly to
mains in operation. It is desired that such cut
the opening 29 at the top of the body I0 (see Fig.
oiî means shall be easy to operate and maintain
3)
and that it shall not be subject to wear through 35 For controlling the pressure developed by the
erosion when in operation.
low pressure pumping section A, there is provided
A further object is to provide a pump unit
a
pressure regulating apparatus 30. This appa
which is compact and has all moving parts read
ratus includes the plunger 3I carried in the cy
ily accessible.
Other objects and advantages will be apparent 40 lindrical cavity 32 of the body IU, which cavity l
communicates at its bottom with passage 23.
as the specification proceeds.
The upward movement of the plunger 3| is re
An embodiment of the invention is illustrated
sisted b-y the spring 33, the upper end of which
in the accompanying drawings, in which
bears
against the centering piece 34, which in
Fig. 1 is a perspective view of a pump fully
turn bears against the bottom of adjusting screw
assembled; Fig. 2 is a plan sectional view taken 45 35 carried in the nut member 35. A cap 31 car
as indicated at line 2-2 of Fig. l; Fig. 3 is an ele
ried on the nut member serves to enclose the
vational sectional View taken as indicated at line
screw 35. l
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3--3 of Fig, 2; Fig. Il is an elevational sectional
A passage or conduit 38 leads from cavity 32
view taken as indicated at line 4-4 of Fig. 2; and
to an opening in the top of body I0, which open
Fig. 5 is an elevational sectional View taken as 50
ing may be connected by suitable conduit with
indicated at line 5-5 of Fig. 2.
a low pressure liquid receiver which may be the
As illustrated, the structure includes a pufmp
same as the liquid source with which the inlet
body l e to which is secured the iront bearing cap
passage 231s connected. As seen moreclearly
I I and the rear bearing cap I2. Screws I3 serve
at Fig. 4 of the drawings,V when the `plunger 3l
to fasten these caps tight against the pump body. 55 is moved upwardly against the spring 33 to bring
2,407,923
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The conduit $2 connects the- outlet of the high
the mouth of the conduit 38 into communication
with the lower part of the cavity 32, a part of the
liquid delivered by the pump section A may be
by-passed through the conduit 38 and led through
other suitable conduit back to the liquid source.
The apparatus 30 may be adjusted by turning
pressure section to the pipe 86 which forms the
pump outlet and leads to the particular appliance
receiving the hydraulic power. The conduit 'l2
containing the valve 'i3 is connected to the pipe
88 which, as before explained, leads back to the
source of liquid supply in the housing 82. rThe
inlet conduit 9| has its one end connected with
the inlet opening 2li and its other end connected
with the source of liquid supply.
The conduit
9@ connects the passage 38 with pipe 88 leading
the adjusting screw 35 to permit greater or lesser
pressure to be developed by the pump section A as
may be desired. When the screw is turned to a
lower position, this requires a greater liquid pres
sure on the bottom of the plunger 3| to raise the
back to the liquid source.
plunger suñiciently to allow liquid to be ley-passed
through the passage 38.
Communicating with the passage 23 is a side
conduit Bil which leads to thevalve cavity :il (see
Fig. 3). In this cavity is the valve ¿l2 including
a ball 43 pressed by spring 44, the top of which
is held by the plug 65. The valve arrangement
is such as to permit liquid to pass from the pas'- .
sage @il into the valve cavity, but to prevent the
‘
When the improved pump is started in opera
tion, the valves 'l2 and 89 are closed, and the ro
tation cf shaft Iii powered by motor Il serves
to actuate both the low pressure section and the
high pressure section. The rotation of gears I8
and lâ of the low pressure section serves to draw
liquid from the source through the conduit 9i
and passage 23, and to pass liquid under pressure
through the passage 26. Frompassage 26, the
back ñow ci liquid from the valve cavity into
the passages 49 and 28. The valve cavity 45 com
municates through the passage llt with thel cyl
índer 5i! of the high pressure pump section B.
g :The highpressure pump section B;.(see Figs, 3
liquidv passes >consecutively through passages 2l
and Zâ, and is led through pipe 83 from which
it passes through valves 84 and 85' to the outlet
of the pump. The construction of this low Ypres
and 51)¿is._ driven through the rotation of the .
shaft,I i4 on which is mounted the eccentric El.
sure section permits the delivery of liquid at a
relatively rapid rate. However, when the pressure
builds up substantiallyrat the pump outlet, liquid
is no longer delivered directly from the low pres
extend-_ing verticallyy above, the eccentric 5I is lined 30 sure section tothe pump outlet, A.as above de
with a lbushing 56 and apiston ,53 is mounted
Pressure at the outlet-of the low pressure sec
for reCíproCal movement within the cylinder. The
tion above a predetermined amount causes the
base ofk piston 5.3 rests on the bearing 54 of the
plunger 3l to rise against the spring 33 to permit
eccentric El and is adapted to be moved in re
a small amount ofv liquid to be by-passe‘d back
ciprocal motion through actuation by rotation of
to the' liquid source, and when a high pressure` is
the eccentric. 'Access to the cylinder is provided
TheV shaft is journaled inthe bearings le and 52V
on-'eacbside of. theeccentric 5l. The cylinder 55
scribed.
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, by the plugged opening 51 at the top, and a
called forv at the pump outlet so that no liquid
plugged opening 5B, allows access to the eccentric.
Anvout'let from the high pressure section is
plunger rises still further so that a major portion
can'be delivered directly through pipe 83, the
provided by the passage 6i] leading from the .
or" the liquid passed by the gears is ley-passed back
passage d6 (see Fig. 2). Passage 6U leads through
the valve structure 6I to the conduit 62> which
may lead to the pump outlet. The valve struc
turel Ell) includes a cavity 53 in which is located
to the source.
In this way, the pressure of the
liquid at the outlet of the low pressure section is
maintained at a substantially constant level, ir
respective of how mu'ch `of the ' liquid passed
therethrough is delivered to the pump outlet.
At the same time that liquid is being delivered
such as to _prevent iiow of liquid from the pump»
to the pump outlet through operation of the low
outlet back into the high pressure pump section.
pressure section to build up the pressure at the
A passage ‘I0 leads from the top of cylinder 55
pump outlet, the high pressure section will also
and connects through the valve structure 'il with
a conduit 'l2 which may lead through needle valve 50 have been Vin. operation, and rotation of the ec
centric ‘äl will have produced reciprocation‘of the
'i3 (Fig. l) to a low pressure liquid receiver, suit
piston 53. The retraction or downward move
ably the liquid source from which liquid is drawn
ment of' piston 5.3y will permit liquid tb pass
into the inlet passage 23 of the low pressure sec
through the' valveI ft2, impelled‘by the pressure
tion. The opening of the valve 'H3 serves to permit
flow of liquid through passage 'lll and conduit 'l2 55 developed by the low pressure section, and the
following advancement or upward movement of
to relieve the pressure in the outlet of the high
the .piston will force the liquid Awhich has entered
pressure section and stop delivery of liquid un
through valve ¿i2 out through the passage 6€),
der pressure though the reciprocating apparatus
valve 6i and conduit 62 to the pump outlet.
of this section continue to operate.
The pump body Hl, with'the caps il and l2 60 However, until the pressure atthe pump> outlet
has built up, the liquid delivered through the
attached, may be mounted on the base 80, as
conduit e2 from the high pressure section will
shown in Fig. 1, and set on top of a housing 82
be small in comparison to the volume of liquid
which may contain a receptacle holding a supply
delivered thro-ugh the pipe 83 from the >low pres
of oil, or other liquid. rI‘he motor l1 is arranged
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with its drive shaft in drive connection with the 65 sure section.
- When the pumpfoutlet pressure is high and
shaft I4. As shown in Fig. 1, the pipe S3 connects
the low pressure discharge opening 29 with valves
ful-l power is needed, the low pressure section, as
bei-ore» stated, ceases to> deliver liquid to the pump
Bâ and 85, which in turn connect with conduits
outlet, and at this point the operation of the high
S6 forming the outlet of the pump. In this par@
ticular set-up, a gauge 87 is provided for indi 70 pressure sectionbecomes of importance. The liq
uid under the relatively .low pressure developed
eating the pressure developed by the low pressure
by the low pressure section passes through the
section.
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valve ¿i2 and out by way of valve 6l and~ conduit
The pipe Se provides a passage controlled by
62to the pump outlet impelled by the advance
y the valve $9 for the return of liquid ‘back to the
the ball B4 and spring 65, the arrangement being`
source for reuse.V
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stroke of therecíprocating piston.
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5
9,407,929
6
Constructed as it is, the improved pump is able
liquid' from said main outlet back to said recipro
to deliver at a rapid rate during periods when
high power is not required, and when high power
is required is able to deliver under high pressure.
cating pumping apparatus, a low pressure pump
ing section including a rotary gear pumping ap
paratus, pressure regulating means for maintain
ing the pressure of _ liquid at the output of said
This makes the pump extremely versatile, and it
may be'actuated With a relatively small motor.
For example, a pump of this construction pow
ered by a 1/2 H. P. electric motor may develop a
pressure of about 3,000 pounds per square inch.
An important feature of the improved pump is
that the high pressure section is arranged in the
low pressure section at a substantially constant
level, a conduit system connecting the output of
said lovv pressure section with the output‘of said
pump and connecting also the >output of said low
pressure section with the inlet of said htigh pres
sure section, a valve preventing flow of liquid
from said main outlet back to said low pressure
section, a valve preventing now of liquid back
from said high pressure section to said low pres
sure section, and means for driving both of said
liquid flow circuit in series with the low pressure
section. In this Way, pressure is vmaintained on
the piston as it moves in its downward or reverse
stroke, and the objectionable pulsations common
in high pressure systems heretofore used are
pumping sections.
eliminated. By the improved construction, the
_
3. A pumping unit having a main outlet and
comprising a high pressure pumping section with
its outlet connected to said main outlet, a valvé
preventing the flow of liquid from said main out
let back to the outlet of said pumping section, and
means for stopping the delivery of fluid under
pressure to said main outlet While said pumping
movement of the piston is smooth and regular,
and the usual vibration caused by reversal of
pressure on the piston at the change of the stroke
is avoided.
It is not necessary to use special oils or other
special liquid in the improved pump, and ordi
nary motor oil may be used. Cooling of the oil
section is in operation comprising a conduit con
' usually required on other high pressure systems 25 necting the outlet of said pumping section to a
is not here essential.
The means provided in the improved construc
tion for stopping now of oil under high pressure
is advantageous in that the usual valve in the
high pressure line is eliminated. A needle valve 30
low pressure area, a valve for preventing back
ñovv of liquid from said low pressure area to the
outlet of said pumping section, said last men
tioned Valve being adapted to prevent free ñow
is subject to considerable wear since the liquid
passing through causes erosion. In the improved
of liquid from said outlet to said low pressure
area, and a valve selectively operable to open and
close the passage in said conduit for controlling
the passage of liquid through said conduit.
structure, the pressure is relieved the moment
liquid starts to pass through the valve '13, and
erosive Wear is substantially avoided.
comprising a high pressure pumping section in
cluding a reciprocating pumping apparatus the
in a high pressure line is a source of trouble and
In the foregoing description, a-single embodi
ment of the invention has been described in great
detail. It must be understood that this detailed
description has been given for purposes of ex
planation only, and that the invention may be
practiced in many modified forms, and many
4. A pumping unit having a main outlet and
. outlet of which is connected to said main outlet
and including valve means for preventing iiow
of liquid from said main outlet back to said re
ciprocating apparatus, means for stopping ñoW
of liquid from said reciprocating apparatus to
said main outlet, said means including a conduit
changes may be made without departing from
the spirit of the invention.
In the foregoing explanation and in the claims,
the terms “high pressure” and “low pressure” are
pumping apparatus outlet, and a valve selectively
used in a relative sense to describe the pressures ~
operable to open and close the passage in said
developed by the one pumping section With rela
tion to those developed by the other pumping
section, and not for the purpose of designating
any particular range of pressures.
through the conduit, a low pressure pumping sec
I claim:
l. A pumping unit having a main outlet and
comprising a high and low pressure section eachl
having an outlet communicating with said main
outlet, said low pressure section having its outlet
connected also with the inlet of said highpres
sure section and being adapted to deliver liquid
to said main outlet at a relatively fast rate so
. long as the pressure at said main outlet does not
exceed a predetermined pressure, said low pres
sure section being also adapted to deliver liquid
to said high pressure section when the pressure
of said main outlet is in excess of said predeter
mined amount, a shaft for driving both of said
pumping sections, a valve preventing backflow
of liquid from said main outlet to said high pres
sure section, and a valve preventing backñow
of liquid from the inlet of said high pressure
section to said loW pressure section.
2. A pumping unit having a main outlet and
comprising a high pressure pumping section in
cluding a reciprocating pumping apparatus the
outlet of Which is connected to said main outlet
and including valve means for preventing llow of
connecting the outlet of said reciprocating pump
ing apparatus to a low pressure area, a valve pre
venting backflow of liquid from said area to said
conduit for controlling the passage of liquid
tion including a rotary gear pumping apparatus,
a conduit system connecting the outlet of said
rotary gear pumping apparatus to said main out
let and also to the inlet of said reciprocating
pumping apparatus, a valve preventing iiow of
liquid from said main outlet back to said rotary
gear pumping apparatus, a valve preventing flow
of liquid from said reciprocating pumping appa
ratus back to said rotary gear pumping appara
tus, and means for preventing the rise of pressure
at the output of said low pressure pumping sec
tion beyond a predetermined amount when the
fioW of liquid through said conduit system to said
main outlet diminishes.
5. .A pumping unit having a main outlet, com
prising a high pressure pumping section includ
ing a reciprocating pumping apparatus the out
let of Which is connected to said main outlet and
including valve means for preventing flow of liq
uid from said main outlet back to said reciprocat
ing apparatus, means for stopping flow of liquid
from said reciprocating apparatus to said main
outlet, said means including a conduit connect
ing the outlet of said reciprocating apparatus to
a low pressure area, a valve preventing backiiow
75 of liquid from said area to said pumping appa
9,407,952??
outlet, a Valve seleetively operable to .open
and elose the passage in saidl conduit for `eontrol
line the passage of liquid through the eondnit,
low pressure pumping apparatus, a conduit sys
teni oonneeting the .outlet of said low pressure
pumping apparatus vto the inlet of said recipro
cating pumping apparatus, and a Valve prevent
ing flow of liquid from said reciprocating pump
ing apparatus back to said low pressure _pumping
apparatus.
6, A pumping unit having a main outlet and
comprising pumping means >for maintaining a
supply of liquid at a substantially constant low
pressure,> a reciprocating pumping section hav
ing its inlet connected to theoutlet of said pump’
ing means and having its outlet connected to said
main outlet,y said pumping section being eiïective
for delivering liquid to said main outlet atl rela
tively high pressure, a, rotary drive shaft con
nested with said pumping means Yand adapted
to drive the same, and a kcam on said shaft for
driving said reciprocating pumping section upon
rotation Vof said shaft.
7. A pumping unit as set ,forth in claim 6
wherein said driving shaft includes a single shaft
extending into both said pumping means and
said reciprocating pumping section.
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GEORGE E. GALL.
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