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Патент USA US2083854

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June V15, 1937.
R. E.- McGEE
‘
. 2,083,854
HYDRAULIOPUMP 3
Filed Sept. 12, 1935
‘s7wig.
48 INVENTOR.
?oat/er 5 M5 6::
\
ATTORNEY.
‘
Patented June 15, 1937
- ‘2,083,854
UNITED STATES
PATENT OFFICE‘
2,083,854
HYDRAULIC PUMJP
Robert E. McGee, Beeville, Tex.
Application September 12, 1935, Serial No. 40,208
4 Claims.
This invention relates to new and useful im
provements in hydraulic pumps.
One object of the invention is to provide an im
proved hydraulic pump which may be utilized to
(Cl. 103-37)
from a reading of the'iollowing speci?cation and
by reference to the accompanying drawing, in
which an example of the invention is shown, and.
wherein:
_
-
Figure 1 is an elevation of a hydraulic pump,
5 actuate a ram, jack, or other mechanism.
An important object of the invention is to pro
vide an improved hydraulic pump which is so con
structed that upon initial actuation the pump will
constructed in accordance with the invention.
Figure 2 is a transverse, vertical sectional view
taken on the line 2-2 of Figure 1, and showing
act as a large displacement low pressure pump,
both pistons in a lowered position, .
Figure 3 is a plan view, '
10 further actuation of said pump converting the
same into a small displacement high pressure
pump, whereby when the load is light a large
amount of ?uid is displaced at a low pressure and
when said load increases a small amount of ?uid
15 is. displaced under a high pressure.
Anotherobject of the invention is to provide
an improved hydraulic pump which includes a
. double piston, one larger than the'other, the pis
tons. being so arranged that upon initialractua
20 tion of the pump the large piston is moved to dis
place a greater amount of ?uid under a low pres
sure, continued actuation of the pump causing the
smaller piston to come into action to displace less
?uid under a high pressure, whereby the pump is
25 automatically converted from a low pressure to
a high pressure pump as the load increases and
the high pressure'is necessary.
'
5
10
Figure 4 is a view similar to Figure 3, and show
ing the large piston locked in its lowered position,
Figure 5 is an elevation of the upper portion
of the pump taken at right angles to Figure 1,
and
,
15
Figure 6 is a transverse, vertical sectional view
taken on the line 6—6 of Figure 3.
_
In the drawing the numeral l0 designates a
cylinder which is shown disposed vertically, and
_
this cylinder has its bottom closed while its upper 20
end is opened. The cylinder may be made of
metal, or any other suitable material and its par
ticular size is subject to variation. The upper
end of the bore of the cylinder’ is formed with an
internal, annular shoulder H on which a suitable 25
packing ring l2 rests. The packing ring is held
in position by a suitable packing gland l3 which
A further object of the inventionis to provide is threaded into the upper end of said cylinder,
an improved hydraulic pump including a large ' as is clearly shown in Figure 6. The packing
gland has an annular peripheral ?ange at its 30
30 piston and a small piston with means for connect
upper end and the upper end of the cylinder is
ing the two pistons so that they will move simul
taneously, so that upon initial actuation of the counter sunk at M whereby when the gland is
screwed downwardly into position the upper end
pump a large amount of ?uid under a compara
tively low pressure will be displaced, and means thereof will be ?ush with the top of the cylinder.
An enlarged piston I5 is mounted to slide with- 35
35 for disconnecting the pistons from each other
after the large piston has completed its full in the cylinder l0 and the piston has a length sub
stroke, whereby the small piston may then be stantially the length of said cylinder. The upper
actuated independently of the large piston to end of said piston is provided with an outwardly
directed peripheral ?ange l6, and this ?ange is
displace ?uid under a high pressure.
40 A still further object of the invention is to arranged to engage the upper end of the cylin- 4o
provide an improved hydraulic pump including a der when said piston is in its lowermost position
large piston slidable within a cylinder and a small (Figure 2) . The piston is provided with an axial
piston slidable within. the large piston with means bore ll which extends throughout the length
'for connecting the two pistons together so that thereof and the upper end of the bore is formed
45 they will move as a unit, and means actuated by
the fluid pressure for disconnecting the two pis
tons when the ?uid pressure has equalled the
with an annular shoulder or recess l8 whereby 45
a suitable packing ring l9 and packing gland 69’
may be located therein. An inner or reduced pis
pressure being exerted thereagainst by the large ton 20 is mounted to slide within the axial bore
piston whereby after such equalization the small ll of the large piston I5 and this inner piston is
50 piston may be independently operated to increase provided with an enlarged head 20' near its upper 50
the pressure of the ?uid.
end.
When the piston 20 is in its lowermost position
A construction designed to carry out the in
vention will be hereinafter described, together
within the axial bore ll (Figure 2), the head 20'
with other featuresof the invention.
55
The invention will be more readily understood
thereof is located within an upwardly extending
collar 2! which is made integral with the enlarged 55 I
.2
2,083,854
piston I5. The piston I5 is provided with a suit
able packing cup I5’, while the smaller piston 20
the outlet line 26 will be under a comparatively
low pressure. However, at this time a compara
has a similar packing cup :2 at its lower end. It ' tively large amount of ?uid will be displaced be
cause of the large size of the piston I5. There
will be seen by observing Figure 2 that the en
UK larged piston I5 is arranged to slide within the
cylinder I0. Leakage of ?uid is prevented by
the packing cup I5’ and the packing ring I2 at
the upper end of the cylinder. Leakage through
the bore IT of the large piston is prevented by the
10 packing cup 22 on the inner piston 20 and also
by the packing ring I8 at the upper end of said
bore.
The bottom I0’ of the cylinder is provided with
a port 23 which extends diametrically through
said bottom.
One end of‘the port has an inlet
pipe 24 connected therewith whereby hydraulic
?uid is introduced into said port‘. A suitable
check valve 25 is connected in the inlet line 24.
The other end of the port has an outlet pipe 26
20 connected therewith which also has a check valve
21 mounted therein. The port communicates
with the interior of the cylinder Ill through an
axial opening 28 which is formed in the bottom
Ill’. Thus it will be seen that hydraulic ?uid
25 entering the port through the inlet pipe 24 may
?ow into the interior of the cylinder I0 when the
pistons I5 and 20 are in their raised position. It
will be obvious that when the pistons move down- -
wardly within the cylinder the hydraulic ?uid
30 will be forwarded outwardly through the port 23
into the outlet line 26 and to the check valve 21
and then to a ram, jack, or other mechanism.
For reciprocating the pistons I5 and 20 within
the cylinder, the head 20’ of the inner piston 20
is provided with an upwardly extending arm 29.
This arm has a lever 30 pivoted thereto, as is
nected together and the lever 30 is swung it
will be seen that a low pressure large displace
ment pump will be had.
Therefore when the ram
is ?rst actuated, at which time the load is light,
a comparatively large amount of hydraulic ?uid 10
under a low pressure is forced thereagainst. This
is desirable because upon initial movement of
the ram when the load is light a high pressure
?uid is not necessary and by providing a com
paratively large amount of fluid under a low 15
pressure the initial movement of the ram is in
creased. When the back pressure on the ?uid
Within the line 25 increases due to an increased
load on the ram which it is operating, a point will
be reached when this back pressure is equal to 20
the pressure which can be exerted downwardly
by the enlarged piston I5. When this occurs fur
ther actuation of the enlarged piston I5 will be
stopped and therefore it is necessary to apply
more pressure to the ?uid.
At such time ‘it is
desirable to disconnect the piston I5 from the
smaller piston 20 and permit the smaller piston
to operate independently of the large piston. Due
to the small cross-sectional area of the inner pis
ton 20 it will be seen that a much higher pres 30
sure may be_applied to vthe ?uid through the
reciprocation of this smaller piston. For auto
matically disconnecting the two pistons from each
other when the equalization of pressure, above
referred to, occurs, the ?ange I6 of the large pis
ton I5 is formed with a pair of diametrically
cleary shown in Figure 1. The pivot of the lever
opposite notches or cut out portions 35 (Figures
is nearer one end of said lever and that end of
3 and 4). Normally, ‘these notches are in align
ment with upwardly extending arms 36 which are
formed integral with the cylinder I0. By ob elf)
serving Figure 3, it will be seen that with the
notches in alignment with said arms, that the
piston I5 is free'to move vertically. The lower
end of the arms 36 are provided with inwardly
the lever is pivoted to an upwardly extending
40 bracket arm 3'I which is preferably made integral
with, and extends upwardly from the cylinder I0.
It will be seen that when the lever 30 is swung on
vits pivot the inner piston will be raised and
lowered.
,
For connecting the piston 20 with the larger
piston I5. whereby swinging of the lever 30 will
operate both pistons simultaneously, the head 20’
of the inner piston 20 is provided with a pair of
diametrically opposite, outwardly extending pins
32.‘ These pins are arranged to engage in L-slots
33 which are formed in the collar 2| which ex
tends upwardly from the enlarged piston I5 (Fig
ures 2 and 5). It will be 'seenthat when the pins
32 are engaging in the horizontal leg of the
slots 33 that the pistons I5 and 20 are connected
together, whereby a vertical movement of the
inner piston 20 will move the large piston I5 ver
tically within the cylinder I0. Therefore, so long
as said pins are in vengagement with the slots
directed slots 0r notches 31 which are of a width
substantially equal to the width of the ?ange I6.
Therefore, when the piston I5 is rotated in a
clockwise‘ direction (Figure 3) the cut out por
tions 35 of the ?ange It will be moved out of
alignment with the vertically extending arms 36
and the ?ange I6 will move into the notches 31
on‘ the inner face of said arm. When the ?ange
engages in\these notches (Figure 2) it will be
seen that further vertical movement of the pis
ton I5 will be prevented. It is noted that the
‘notches 31 are so located that the piston I5 must
is applied to the hydraulic ?uid beneath the pis
ton by the enlarged piston I5. It is noted that
be in its lowermost position before the ?ange I6
can engage said notches. Therefore, the notches
31 and ?ange I6 provide means for locking the
large piston I5 in its lowermost position. It is
further pointed out that when the piston I5 is
rotated to engage the ?ange I6 in the notches
when the pistons are so connected the inner pis
' 31, such rotation causes the collar 2I at the upper
ton becomes an integral part of the large piston
and does not act independently thereof.
end of said piston to be rotated therewith. Rota
tion of this collar (Figure 5) in a clockwise direc
tion causes the horizontal leg of the L-shaped slots
33 to move away from the pin 32 whereby said
GO the pistons operate
_ a single unit and pressure
' Assuming for purposes of description, that the
outlet line 26 has its opposite end connected to a
. mm (not shown) it will be obvious that when the
. "lever 30 of the device is swung with the pistons I5
. and 20 connected together through the medium
pfgthe pins 32, that the hydraulic fluid beneath
'i- he-pistons will be forced outwardly to the ram
the enlarged piston I5. Due to the large cross
-_
fore so long as the pistons I5 and 20 are con
sectionalarea of said piston, it will be seen that
15: the ?uid which is forcedfrom the cylinder through
pin is aligned with the vertical leg of the slot.
Thus it will be seen that rotation of the piston I5
not only looks said piston in its lowermost posi
tion, but also causes the pin 32 to be disengaged
from the slots 33 whereby the inner or smaller
piston 20 is free to move vertically within the
axial bore I’! of the piston I5.
'
For automatically accomplishing the rotation
2,088,854 .
of the large piston l5 to disconnect the inner pis
ton 20 therefrom and also to lock said large pis
ton in its lowermost position, a check valve 40
is provided. The valve 40 is connected in a by
pass line 4| which has one end connected with
the interior of the cylinder In above the bottom
thereof.- The other end of the line 4| is con
nected to the met line 24 at a point in front
of the check valve 40. The valve stem 42 of
1 0 said valve extends upwardly from the upper end
of the valve and a coil spring 43 normally holds
said valve close-d. The upper end of ‘the stem)
42 has the lower end of an actuating rod 44 con/
nected therewith. The rod 44 is arranged to
slide within a groove 45 which is formed in the
outer surface of the cylinder Ill. The upper end
of said rod extends through a groove 45’ formed
on the inner periphery of a metal ring 45 which
is slidably mounted on the upper end of the cyl
inder Ill. The extreme upper end of the rod 44
has an outwardly directed lug 41 which over
hangs the upper end of the ring 46. This lug is
adapted to ?t in a recess or notch 38 which is
formed in the upper end of the ring 46. ‘It will
be obvious by observing Figures 1 and 2 that
when the valve 40 is in a closed position the lug
_
3
through the medium of the pins 32 and slots 33.
Also, the cut out portions 35 of the ?ange I6
of the large piston are in alignment with the
vertical arms 36 which extend upwardly from
the cylinder Ill. When the hand lever 30 is de
pressed it will be obvious that the two pistons
will move as a unit. Therefore, as the large pis
ton l5, and the small piston connected there
with, move, vertically within the cylinder l0‘ it
will' be obvious that a comparatively large 10
amount of ?uid will be displaced into the outlet
pipe 26 under a comparatively lovtr pressure. As
pointed out above, this low pressure is due to
the fact that the cross-sectional area of the pis
ton I5 is comparatively large. A suitable cushion 15
52 (Figure 2) may, if desired, be located in the
lower end of the cylinder l0 to cushion the stroke
of the large piston. This cushion will, of course,
be provided with an axial opening 52' through
which the smaller piston, when independently 20
operated, may pass.
Continued reciprocation of the two pistons as
a unit will, of course, build up the pressure in
the outlet lines 26 and when this pressure builds
up to a point where it is equal to» the force ex
erted downwardly by the piston l5 then this
41 is in engagement with the recess 38~whereby
pressure will be suf?cient to overcome the pres
the ring 45 is held in a stationary position with . sure of the spring 43 on the valve stem 42 which
is holding the valve 40 closed. Therefore, when
relation to the cylinder ID.
the equalization ‘of pressure occurs, the valve 40
The ring 46 has one end of a coil spring 48
secured thereto. This coil spring is wound will be raised to permit the ?uid within the lower.
around the cylinder l0 and has its other end end of the cylinder and under the pressure which
secured to said cylinder. It'is pointed out that the large piston |5 has built up, to escape through
when the spring is ?rst located it is placed under the line 4| and back into the inlet line 24. When
the valve stem 42 is lifted due to the opening of
a tension whereby it tends to rotate the ring 48
the valve 46, the rod 44 which is located in the
in a clockwise direction. So long as the lug 4'!
vertical groove 45 in the side of the cylinder It]
of the rod 44 is in engagement with the recess
will, of course, be raised. The raising or lifting
or notch 45' in the upper side of the ring 46,
it will be obvious that said ring is held in its» of the rod 44 will disengage the lug 31 at its
4 0 fixed position and is not capable of a rotation.
upper end from the recess or ‘notch 48 in the 40
However, when the rod 44_is raised to disengage
ring 46 which surrounds the cylinder l0.
the lug 47 from the recess 45' it will be obvious
soon as the lug 4‘! is disengaged from said notch,
that the spring 48 will immediate-1y rotate the
ring 46 in a clockwise direction. For communi
the coil spring 49 will immediately rotate the
cating this‘ rotatable movement of the ring 46
to the large piston l5, the ring is provided with‘
an upwardly extending rod 50.
This rod is so
positioned that when the ring is held in its sta
tionary position by the engagement of the lug
‘41 in the notch .45’, said rod 50' is rotated con
tiguous to a radially extending handle 5| which
is made integral with the ?ange |6 of the pis
ton .|5. By observing Figure 3, it will be see-n
that when the lug 41 is disengaged from the
not-ch 45' due to.the lifting of the rod 44, the
ring 46 will be rotated by the coil spring 48. R0
tation 'of the ring 46 will,»of course, move ,the
upwardly extending arm 50 around the outer pe
riphery of the cylinderv In. The movement of
60
As
ring 46. Rotation of the ring 46 will cause the
rod 50 which is secured thereto to engage the
radially extended handle 5| on the ?ange l5 of
the piston l5, whereby “the piston |5 is rotated
in'a clockwise direction. As explained above,
this'rotation will cause the ?ange N5 of the pis
ton to engage the notches 31 in the vertical arm
36 to lock the piston in its lowermost position.
At the same time the pins 32 are disengaged from
the horizontal leg of the slots 33 which disen
gages the inner piston 20 from the outer piston
I5, thereby permitting said inner piston to be
operated independently'of the large piston.
I Thus it will be seen that when the pressure
built up by the operation of the piston l5 equals
the force which is exerted by said piston, then
the piston is locked in a lowermost position and
this rod causes said rod to engage the radially
extended handle 5| on the piston l5, whereby‘ the smaller piston 20. is disconnected from the
said piston is rotated in a clockwise direction. large piston to permit independent operation of
As has been explained the clockwise rotation of
the piston l5 will cause the ?ange I6 to engage
Li the notches 31 in the arm 36 to lock the large
piston I5 in its lowermost position. At the same
time this rotation of the piston l5 causes the
said smaller piston. Due to the small cross
sectional area of the piston 20 operating within
the axial bore I‘! of the large piston, it will be 65
obvious that continued actuation or swinging of ‘
the hand lever 30 will reciprocate the smaller
piston 20 to displace a smaller amount of ?uid
pins 32 on the inner or smaller piston 20 to dis
engage the horizontal leg of the L-slot 33, Whereby the inner or smaller piston 20 is free to un
dergo a vertical movement within the axial bore
from the lower end of the cylinder under a
higher pressure. Therefore it will be seen that
l’! of the large piston l5.
tively large amount of fluid under a lower pres
sure is displaced into theoutlet lines 26 and to
_
In operation, the'parts are moved to the posi
tion shown in Figure 1, with the inner or smaller
piston 20 connected with the large piston |5
60
upon initial actuation of the pump a compara
the particular mechanism which the ?uid is ac
tuating. After the large piston l5 has built up
4
2,083,854
the maximum pressure of which it is capable,
then the smaller piston 20 is automatically dis
by that piston after which time the second pis
connected from, the larger piston and is oper
ated independently to displace a less amount of
?uid under a higher pressure to the particular
mechanism. Therefore in utilizing the pump to.
pistons against such spring urged rotation and
ton is actuated, a spring element for urging said
pistons rotatably in one direction, pressure con
trolled latch means for releasably holding said
a single means for moving the pistons.
2. A hydraulic pump including, a cylinder hav
ing ?uid therein, a piston slidable in said cyl
inder and having an axial opening therethrough,
a second piston slidable within the opening of 10
displace a comparatively large amount of ?uid the ?rst piston, means for connecting the piston
whereby both pistons move simultaneously and
so as to bring about an increased movement of
the ram to bring it into actual working position. act as a large piston until such time as su?icient
Since the load on the ram is light at the start ‘ pressure of the ?uid has been built up to equal
15 of the movement, the ?uid which is actuating the force exerted by said large piston, means for 15
said ram at this time need not be under a high disconnecting the pistons whereby the second
actuate a ram, it will be seen that upon initial
actuation or at the start of the movement of the
ram, there is practically no load or a very light
10 sad on said ram. In such case it is desirable to
pressure. Therefore the large piston l5 moving
upon initial actuation of the pump will displace
this large amount‘ of ?uid under a low pressure
20 to begin the movement of the ram and to, rap
idly bring it- into .its operating position.
After
the load increases on the ram and there is a ne
amount of ?uid. under a high pressure, means
cessity for high pressure then the smaller piston
for locking the ?rst piston in its lowermost po
is brought into-play and through the‘ actuation
sition when the second piston is disconnected
therefrom, and means actuated by the pressure 25
of the ?uid for simultaneously operating the dis
connecting means and the locking means.
3. A hydraulic pump including, a cylinder hav
25 or reciprocation of said smaller piston the ?uid
is forced to'the ram under a comparatively high
pressure. Although the smaller piston is capa
ble of placing a higher pressure on the ?uid, it
is pointed out that due to its small cross-sec
30 tional area it cannot displace as large amount
of ?uid as the larger piston l5. 'However, the
displacement of a large amount of ?uid at this
time ‘is unnecessary because the ram is already
in its working position and a load is imposed
35 thereon which requires a high pressure on the
ing ?uid therein, a piston slidable in said cyl
inder and having an axial opening therethrough, 80
a second piston slidable within the opening of
the ?rst piston, means for connecting the pis
tons whereby both pistons move simultaneously
and act as a single large piston until such time
as the ?uid pressure built up by said piston 35
?uid.
The release of the large piston, after it has
equals the force exerted by thepiston, and means
actuated by the ?uid pressure for disconnecting
beenlocked in its lowermost position and its con
the piston and locking the ?rst piston in an in
active position, whereby the second piston may
then be operated independently to displace a
nection to the smaller piston 20 after having
40 been disconnected, is easily accomplished by
merely grasping the handle 5! on the ?ange N5
of the large piston 15 and rotating said piston
in a counter-clockwise direction. This returns
' the parts to their normal position, the lug 41
45 dropping into the recess 45' to again lock the
ring 46 in its ?xed position and the pump is
ready for the next operation.
What I claim and desire to secure by Letters
Patent is:
50
piston may be operated independently of the
?rst piston after such equalization occurs, there
by ?rst displacing a comparatively large amount
of ?uid from the cylinder under a low pressure 20
and then displacing a comparatively small
~
~
1. A hydraulic pump including, a cylinder hav
comparatively small amount of ?uid under a
high pressure.
4. A hydraulic pump including, a cylinder hav
ing ?uid therein, a piston slidable in said cylin
der and having an axial opening therethrough,
a second piston slidable within the opening of
the ?rst piston, means for connecting the pis
‘tons whereby both pistons move simultaneously
and act as at single large piston until such time
as the ?uid pressure built up by said piston‘ 50
ing ?uid therein, a piston slidable within said 'equals the force exerted/by the piston, means
- cylinder for displacing the ?uid therefrom un
~Hder a low pressure, a second piston smaller than
the ?rst piston for displacing the ?uid from the
55 cylinder under a high pressure, said pistons be
ing rotatable in said cylinder means for connect-.
ing the'pistons whereby they move as a single
unit until the pressure built up by the movement
of the ?rst piston is equal to the force exerted
actuated by the ?uidk‘pressure for disconnecting
the piston and locking the ?rst piston in an in
active position, whereby.‘ the second piston may
then be operated independently’ to displace a 55
comparatively small amount of ?uid under a‘
high pressure, and a single means for moving the
' pistons.
ROBERT E. MCGEE.
'
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