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July 3, 1962
N. F. ATHERTON ETAL
3,041,975
FLUID ACTUATED HYDRAULIC POWER UNIT
Filed May 26, 1.960
4 Sheets-Sheet 1
INVENTORS
‘
BY
NE”. F.’ Grazer-av
dOJEP/i .4. JdHNJfan/
MMJM
July 3, 1952
N. F. ATHERTON ETA].
3,04l',975
FLUID ACTUATED HYDRAULIC POWER UNIT
Filed May 26, 1960
4 Sheets-Sheet 5
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7.7980
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A 7 TQEMEY}
July 3, 1962
N. F. ATHERTON ETAL
3,041,975
FLUID ACTUATED HYDRAULIC POWER UNIT
Filed May 26. 1960
-
4 Sheets-Sheet 4
IN VEN TORS
N514, F.‘ 977452 7-0”
JOSEPH A. Jay/15f?”
mmemeeu.
United
atent ?ic
1
3£4L975
Fatented July 3, M962
2
throttle valve for pressurized ?uid such as live air as well
as the hydraulic circuitry through a novel pressure release
3 041,975
FLUID ACTUATED IiIYDRAULIC POWER UNIT
Neil F. Atherton, Bayside, and Joseph L. Johnston, Hart
land, Wis., assignors to Applied Power Industries, Inc.,
valve in a positive manner.
Still another object of our present invention is to pro
vide an improved and highly e?icient ?uid actuated
hydraulic power unit which is effectively sealed and oper
a corporation of Wisconsin
Filed May 26, 1960, Ser. No. 31,919
15 Claims. (Cl. HIS-5G)
able under varying atmospheric conditions or even when
completely submersed in liquid or used in ‘dust laden
The present invention relates generally to improve
surroundings and which may be readily adapted for re
ments in hydraulic pressure applying tools adapted to 10 mote control as well as for direct attachment to hydraulic
cylinders or the like.
perform diverse work, and relates more particularly to
improvements in the means for actuating such tools.
An additional object of the present invention is to pro
A primary object of our invention is to provide an
vide an improved air atctuated hydraulic pump device
improved ?uid actuated hydraulic power device which is
which embodies extremely efficient, simple and highly
of extremely compact and unitary construction and which 15 accurate valving arrangements whereby exceptionally
is moreover highly e?icient in operation as well as ?exible
smooth and positive operation is obtained and in which
in its adaptations.
the components are readily replaceable, the pump also
incorporating a novel oil reservoir which permits com
In many types of industries, vehicle service garages,
plete and effective utilization of the liquid stored therein
rescue work, salvaging operations and the like, it is fre
quently required or exceedingly advantageous to utilize
while offering maximum heat exchange surface for the
hydraulic power devices capable of delivering high pres
liquid.
sure ?uid to perform certain work. It has become com
mon practice in such instances to use hydraulic pumps
for delivering high pressure ?uid to such tools as rams
proved ?uid operated hydraulic device adapted to effec
Another object of the invention is to provide an im
tively operate over a wide range of airline pressure with
used for straightening, bending, raising, and other opera~ 25 out adverse effects from normal variations in line pressure
and without need for a separate pressure regulator, the air
tions, load lifting jacks of various types, power presses,
motor of the device embodying a simple and highly effec
power shears, load handling cranes and similar devices.
tive self-cleaning air-?oated single spool valve having a
For the most part, these hydraulic pumps are manual
shear seal cutoff for distributing pressurized ?uid and
ly operable. However, it has been heretofore proposed
to operate the same by electric motor as well as by air 30
controlling the operation.
motor. Manual operation is, of course, tedious and fa
tiguing as Well as time-consuming, and frequently, the
These and other objects and advantages of the inven
tion will become apparent from the following detailed
operator experiences di?iculty in manipulating the pump
in relatively inaccessible locations. On the other hand,
description, taken in conjunction with the accompanying
drawings wherein like reference characters designate the
electric operation is costly and relatively hazardous, 35 same or similar parts in the several views.
requiring a suitable motor together with its driving con
nections and involving the use of electric current. Fur
thermore, electrically actuated hydraulic pumps are nec
essarily bulky and difficult to handle, thus restricting
their use. As for the air powered hydraulic pumps here
tofore proposed, these have failed to gain widespread
commercial acceptance for vairous reasons such as bulk
iness, relatively high cost, lack of durability, inefficiency
in operation and stoppage resulting from clogging or
blocking of ports and passageways, failure to operate con
tinuously under varying conditions and in all positions,
failure to provide efficient and convenient manipulating
FIG. 1 is a perspective view of a typical
powered
hydraulic pressure applying unit embodying the inven
tion;
FIG. 2 is an end view of the device looking at the rear
40 or throttle end thereof, part of the exhaust air check
valve being broken away to reveal normally concealed
structure;
FIG. 3 is a longitudinal vertical section through the
assemblage showing the air motor piston positioned at
45 the end of its forward stroke and about to begin its return
stroke, the oil reservoir being shown in capacity or near
capacity condition by means of full lines and in near
empty condition by means of dotted lines;
FIG. 4 is a longitudinal‘ horizontal section through the
location of such elements as the high pressure outlet, 50 unit but with the air motor section being projected along
the off-center line 4—4 of FIG. 2 to more clearly illus
throttle, reservoir, hydraulic passages, and the like.
It is therefore a further object of this invention to pro
trate the sealed air byepass from the piston chamber to
vide an improved hydraulic pump or power unit operable
the ‘air exhaust ports, the air motor piston in this view
by pressurized ?uid and which obviates or minimizes the
beingshown in its rearmost position about to begin its
above described disadvantages and objections attendant 55 forward stroke;
prior devices of this general type.
FIG. 5 is a transverse vertical section through the hy
Another important object of the invention is to pro
draulic valve block taken along the line 5—5 of FIG. 3;
vide an improved light weight and portable pneumatically
FIG. 6 is a transverse vertical section through the air
actuated hydraulic power package of exceedingly com
valve block taken along the line 6-—6 of FIG. 3, the
pact, unitary and durable construction adapted to be
section being projected through the reduced portion of
produced at low cost, and in which the major compo
the spool valve;
nents such as the ?uid motor, the hydraulic pump, the
FIG. 7 is an enlarged fragmentary section through the
air inlet port, and the high pressure hydraulic outlet, are
pressure release valve portion of the hydraulic valve
all in axial alinement with the air and hydraulic circuitry
block taken from FIG. 4 and showing the valve in
lying in different radial planes relative to each other and 65 seated condition;
transversely of the main central axis of the tool.
FIG. 8 is a similarly enlarged fragmentary section
A further object of our invention is to provide an im
through the release valve showing the valve in open
proved hydraulic pump powered by pressurized ?uid and
pressure release condition;
which is readily manipulatable in con?ned areas and in
FIG. 9 is a somewhat reduced top view of the device
any position by hand, foot or other means, and which 70 showing a ram cylinder in section attached directly to
has but a single operating lever sensitive to the touch and
the high pressure discharge end with a suitable adapter
swingable in a single place for controlling both the
secured to the opposite end thereof; and
and control mechanism for the air throttle valve and the
hydraulic circuitry, high maintenance cost, and improper
3,041,975
35
FIG. 10 is a schematic diagram illustrating the major
components and the air and hydraulic circuitry.
‘Referring to the drawings, the power unit shown
therein as embodying the invention comprises, in gen
eral, a unitary body 16 mounted on a suitable base 11
and having an actuating lever 12 pivoted thereon. The
body 16 contains a ?uid motor portion 13 closed at one
end by a valve block 14.1 for the ?uid motor portion and
having a hydraulic portion 15 extending from its oppo
site end with a hydraulic valve block 16 interposed there
di
ameter portion 39 with the supply passage 22 being
closed by the valve. Thus, the spool valve provides for
alternate supply and exhaust porting of the adjacent end
of the motor chamber, and the valve 37 is conveniently
accessible upon removal of the plug ‘36.
The air motor displacement chamber 46 has a large
diameter piston 48 reciprocable therein, the motor cham
ber being vented to exhaust as at 49 remote from the air
valve block 14. Seated against the front face of the air
10 motor piston 48 is a small diameter pump piston 50 op
erable to pump hydraulic ?uid through passages formed
in the hydraulic block 16 as will hereinafter more fully
appear. The rear of the pump piston 50 extends into
the motor portion 13 of the device, and high pressure
the motor chamber 46 and is preferably formed with a
hydraulic ?uid is discharged from the ‘hydraulic por
tion 15 by way of a high pressure discharge line 18. 15 somewhat enlarged end head 51 having a rounded or
between. Live air or other pressurized ?uid from a suit
able source is admitted by means of the inlet line 17 to
The body it) is conveniently of cylindrical shape, and‘
the ?uid motor portion 13, hydraulic portion 15, and
both valve blocks 14 and 16 as well as the pressurized
?uid inlet line 1'7 and high pressure discharge line 13
are all in axial alinement.
Referring ?rst to the motor portion 13 as shown herein,
a supply hose 17 may be connected to the air valve block
14 as by means of a threaded coupling 26 and supplies
pressurized ?uid such as compressed air from a suitable
source to a supply passage 21, 22 formed in the block
14. The supply passage 21, 22 has a cylindrical throttle
chamber 23 formed therein which is closed by a threaded
plug or bushing 24 housing the throttle valve 25. The
throttle valve 25 is slidably ?tted within the plug 24 and
projects upwardly through the plug and above the valve
block 14-. The valve 25 has a lower collar or ?ange 26
which is normally seated against the lower end of the
plug 24 by the action of a spring 27 compressed between
spherical bearing surface constantly urged to seated posi
tion against the face of the motor piston 48 by a spring
52 compressed between and seated against the rear of
the hydraulic valve block 16 and an annular ?ange 53
radiating from and held captive on the pump piston 50
adjacent its end head 51. The wall of the motor cham
ber 46 is also provided with a port 54 adapted to be
uncovered by the motor piston 48 only when the piston
reaches the end of its forward stroke to thereby place
the rear portion of the motor chamber, via passages 55,
56, in communication with the cavity 57 formed by the
enlarged portion of the bore 35 in back of the enlarge
ment 46 of the spool valve 37. Thus, assuming the
spool valve 37 is positioned as in FIG. 4 with the small
diameter portion 38 adjacent the air supply passage 22,
pressurized air is admitted to the motor chamber 46
behind the piston 48 by way of the passageway 45 in
the spool valve to thereby move the piston forwardly
the bottom of an outwardly open recess 23 formed in 35 or to the left in the motor chamber.
the plug and a washer 29 or similar ?ange forming mem
ber held captive on the projecting end of the valve stem
When the piston
48 reaches or approaches the end of its forward stroke,
the port 54 is uncovered to admit pressurized air from
the rear of the motor chamber 46 to the cavity 57 by
as by means of a pin 36 or the like. The plug 24 has
way of passageways 55, 56, the air thus admitted to the
ports 31 in open communication with the air supply pas
sageway 21 above the valve seat and the collar 26, and 40 cavity 57 thereupon acting on the rear face of the por
tion 40 of the spool valve 37 to move this valve for
the valve stem is provided with an annular ?ange 32 and
wardly or to the left as shown in FIG. 3. The spool
a suitable seal 33 located above the supply ports 31. The
valve in this position cuts off communication between the
throttle valve is therefore removable in its entirety with
air supply line 22 and the motor chamber 46 and opens
the plug 24- for ready inspection, replacement or repair,
the motor chamber to exhaust through the port 44, re
and is actuated upon downward movement of the up
cess 41 and exhaust passage 42, thereby permitting re
wardly projecting stem portion in opposition to the ac
turn of the motor piston 48 as well as the pump piston
tion of spring 27 as will hereinafter more fully appear.
56 by the action of the spring 52. As the motor piston
The air valve block 14 is also formed with an axial
is returned to its starting position, the rear face thereof
bore 35 extending therethrough and closed at its outer
enlarged end by a closure plug 36. Housed within the
contacts the projecting end of the spool valve 37 and
bore 35 is an air servo spool type valve 37 having inter
moves the same to its initial position whereupon the
above described cycle is repeated.
mediate portions 38, 39 of reduced diameter and an end
The pump piston 50 is thus reciprocable within its
portion 40 of increased diameter con?ned Within the
displacement chamber 59 by the combined action of the
enlarged outer end of the bore 35. The spool valve 37
is reciprocable within the bore 35, being limited in its 55 air motor piston 48 and return spring 52, and while the
pump displacement chamber 59 may be formed direct
movement by the enlarged end‘ head 40 operating in the
similarly enlarged portion of the bore. The inner face
of the valve block 14 is provided with a recess 41 sur
rounding the bore 35 and communicating directly with
one or more exhaust passages 42 formed in the air valve
block 14, the recess 41 being closed by a plate 43 having
a port 44‘.- therein alined with and of the same diameter
ly in the hydraulic valve block 16, it is preferably formed
as shown in a readily removable and replaceable cartridge
6% which is threadably received in the block 16. The
60 removable cartridge is provided with a threaded cap 61 at
its outer rear end which prom'des a retainer for a suitable
seal or packing 62‘ embracing the pump piston, and the
inner end of the cartridge has ?ngers 63 providing a re
as the bore 35. The spool valve 37 is also provided with
tainer and spacer for the pump inlet check valve 64- on the
a passageway 45 extending between the reduced diameter
portion 38 and the inner end thereof which has a pilot 65 suction stroke of the piston 50. The hydraulic circuitry
is all formed in the hydraulic valve block 16 and com
portion extending into the air motor chamber 46 to
prises, in part, a suction or supply passage 65, including
be hereafter more fully described. Accordingly, in the
one or more branches 66, extending from the hydraulic
rearward position of the spool valve 37, the air supply
reservoir 67 formed in the hydraulic portion 15 past the
passage 22 is in communication with the motor cham
ber 46 through the reduced diameter portion 38 and the 70 ball check valve 64 to the pump displacement or pressure
chamber 59, the ball valve 64‘ being seated in an obvious
passageway 45 with the recess 41 being closed from the
manner to close the passage 65 during the forward pump
motor chamber 46 by the plate 43 and the adjacent
ing stroke of the piston 50 and being unseated to open
end of the valve, while in the forward position of the
the passage 65 during the return or suction stroke of the
spool valve 37, the recess 41 and exhaust passage '42 is
open to the motor chamber 46 through the reduced di 75 pump piston. Also formed in the valve block 16 is the
3,041,975
5
6
pump discharge or exhaust port 68. communicating with
the high pressure discharge passageway 69 past a one-way
sure hydraulic discharge conduit 71 and line 18 upon
ball check valve 70, the passageway 69' in turn commu
nicating directly with a conduit 71 extending axially
through the center of the reservoir 67 formed in the hy
draulic portion 15 and into communication with the
?exible discharge line 18‘.
‘completion of the desired work, novel release valve
mechanism for porting the conduit 71 back to the hy
draulic reservoir by way of release passageways 94, 95
also formed in the hydraulic valve block 16 has been
provided. This pressure release mechanism consists gen
erally of a threaded plug or bushing 96' removably re
The oil in the reservoir 67 is con?ned within a unique
container or sack formed by a ?exible membrane 73 of
ceived Within a bore 93 formed in the valve block 16
valve block 16 as by means of an annular groove 76 re
ating to pump hydraulic ?uid to the desired source, the
release valve is therefore closed. The lever pivot pin 83
concentrically with the pivot for the lever 12, the plug
generally cylindrical shape having one end reversed in 10 96 having a passageway 97‘ formed therein and commu
wardly and secured to the high pressure discharge con
nicating with the release passages 94, 95 past a ball valve
duit in a suitable manner as by a split ring 74, the other
98. The ball check valve 98 is normally seated against
end of the container being held captive between the wall
the passage 97 ‘at the inner end of the plug 96 by action
of the section 15 and the periphery of the hydraulic
of the pressure ?uid in line 94, and with the device oper
ceiving a bead 75‘ formed on the membrane. Since it is
necessary to vent the reservoir chamber to atmosphere as
is partially threaded within an outwardly open recess 99
at 77, the hydraulic ?uid con?ned within the sack 73 is
formed in the plug 96 to permit free rotation thereof
thus sealed and protected from ingress of foreign matter.
relative to the plug, and this pin 83- is further provided
Furthermore, the construction and ‘attachment of the 20 with an inwardly projecting ?nger 100‘ of reduced diam
membrane or sack ‘as shown and described insures col
eter extending freely into the passage 97 in close proximity
lapse, thereof, as oil is withdrawn, progressively from
to the ball valve 98. In its normal inoperative position,
the end remote from the valve block 16 toward this block,
the ?nger is therefore ‘withdrawn from and does not
thus permitting complete utilization of the reserve ?uid
interfere with the action of the ball check 98, but upon
by virtue of the fact that the membrane does not collapse 25 rotation of the pin 83 in a clockwise direction, its screw
over and cover the hydraulic passages formed in the block
threads cause the pin 83 to move axially inwardly thus
16. However, to doubly insure against possible interfer
projecting the ?nger 100 against the ball 98 to unseat the
ence of the membrane 73 with the hydraulic circuitry,
same against the pressure built up in the passage 94. To
the adjacent face of the valve block may be formed with
facilitate this release operation, the hub on the bifurcated
an annular groove or recess 78 into which the hydraulic
lever arm 101 is split radially as at 102 (FIG. 5) and is
passageways are directed. To permit access to the interior
provided with ‘a clamp screw 103 so that the head of the
of the oil-containing sack for re?lling and like purposes, a
pin 83 may be ?rmly clamped in the lever arm 101 for
suitable passageway 79 is formed in the hydraulic valve
rotational movement therewith. Accordingly, when
block 16, and this ‘access or ?ll passage is normally closed
treadle 84 of the lever 12 is swung downwardly to actuate
by a threaded plug 80.
35 the throttle valve 25, the pin 83‘ with its ?nger 100 is
As previously indicated, the throttle valve 251 is ac
mount or support the same on a medial portion of the de
backed away from the ball 98 which automatically seats
to close the release passage 97 by action of the pressure
?uid in passage 94. To release the pressure built up in
the passage 94, it is only necessary to swing the lever 12
in an opposite direction beyond its neutral position by
means of the treadle portion 86 thereof whereupon the
vice by means of horizontal pivot or fulcrum pins 82, 83
pin 83 is rotated to project the ?nger 100 thereof against
threadably received in opposite sides of the hydraulic
the ball 98 to unseat the same and open the passage 94
tuated upon downward movement thereof, and for this
purpose, the lever 12 is provided. While the design of
this actuating lever 12 may, of course, be varied within
the scope of the invention, it is preferred to pivotally
valve block 16. In its preferred form, the lever is of
through passages 95, 97 to reservoir. The pin 83 may
integral one-piece construction and has a treadle portion 45 also be conveniently provided with a tool receiving slot
84 extending rearwardly above and beyond the upwardly
for ready access and removal, and a suitable seal 104
projecting stem of the throttle valve 25 to cover the same
may also be provided above the passageway 93‘ so as to
while permitting actuation thereof upon downward ap
prevent seepage of hydraulic ?uid past this pin.
plication of pressure by foot or hand to the treadle por
When it [is desired to seal the air motor for effective
tion 84. The lever 12 is also preferably formed with 50 operation in‘exceptionally heavy dust laden surroundings
forwardly and upwardly directed side arms 85 spanned
or even under water as in salvage work, the exhaust ports
at the outer or forward end by a cross-piece 816 which not
42 in the air valve block 14 may be covered by a ?exible
only provides a convenient carrying handle for the device
cap 106 secured in position as by a screw 107 or the like.
but also forms a forwardly extending treadle portion for
The cap 106 thus, in effect, provides a ?ap valve permitting
swinging the lever in the opposite pressure release direc 55 escape of exhaust air from the passageways 4-2 to atmos
tion ‘as will hereinafter more fully appear. While un
phere while preventing entrance of air, Water or foreign
necessary for proper functioning of the actuating lever,
matter, and the forward end of the air motor chamber
means such as a tension spring 87 secured between the
46 may likewise be sealed by providing a suitable by—
lever and the air portion 13 of the body to constantly urge
pass from the vent 49 to the exhaust passage 42. As
the treadle portion 84 of the lever toward seated position 60 shown in FIG. 4, this may be readily accomplished by
against the throttle 25 is also provided, and the primary
forming a passageway 108 communicating with one of
purpose of this spring is to return the lever to a neutral
the exhaust ports '42 in the air valve block 14 and by plac
position.
ing the vent 49 in closed communication with the passage
The means for urging the hydraulic discharge ball
108 as by means of a conduit forming member 109
check valve 70 to seated position is conveniently housed 65 secured as by ‘a screw 1.10 to the valve block 14 or some
within a recess 89 formed in the lever pivot or trunnion
82 and consists of ‘a spring 90‘ seated and compressed be
tween the base of the recess 89 and the rear face of a disk
other convenient part of the body.
The various parts of the improved air actuated hy
draulic pressure applying tool may be readily fabricated
91 having a projecting ?nger coacting with the ball 70.
and assembled with the cylinder wall of the ?uid motor
One leg 92 of the bifurcated lever 12 is preferably loose 70 portion 13 being conveniently attached to the motor valve
ly rotatably received by the enlarged head of the pin 82
block 14 and the hydraulic valve block 16 as by means of
which may be formed with a tool receiving slot as shown
pins and/ or screws 112 and 113 respectively. The device
may obviously be readily dismantled for inspection or
remove the lever or obtain access to the ball check 70.
repair of all working parts, and the base may be secured
To release the pressure developed in the high pres 75 to the body as by screws 115. The lever 12 may likewise
for ready removal of the pin when it is desired to either
3,041,975
8
7
be quickly and easily removed in an obvious manner, and
the throttle valve 25 may be removed bodily with the
plug 24 upon rotation of the lever counterclockwise for
access thereto. vSimilarly, the hydraulic pump ‘which is
a hydraulic valve block interposed between said motor
chamber and said reservoir, said hydraulic valve block
including a pumping chamber opening to one side thereof
and hydraulic inlet and discharge passages, a piston re
entirely contained within the cartridge 60‘ may be bodily
removed and replaced upon dismantling of the motor
ciprocable in said pumping chamber and having a portion
portion, and access to the air pilot valve 37 may be ob
tained merely upon removal of the closure plug 36. Ac
cess to the ball check valve ‘70 may also be obtained mere
coacting with said motor piston, and a tubular member
secured at one end to the opposite side of said hydraulic
valve block and extending through said hydraulic reser
voir and out the adjacent end of said body, said hydraulic
ly upon removal of the pin or trunnion 82., and the re 10 discharge passage communicating between said pumping
chamber and said tubular member to thereby form an
lease valve is also self-contained in a readily removable
axially extending hydraulic discharge passageway.
plug or cartridge 96. The supply of reservoir ?uid may
2. A ?uid actuated hydraulic pump comprising, a uni
be replenished if and when necessary merely by removal
tary body having a motor chamber formed in one end and
of the plug 80, but access to the reservoir may be obtained
upon removal of the end cover plate 81, the cover plate 15 a hydraulic reservoir in the other end axially alined with
said motor chamber, a motor piston reciprocable within
being suitably held in position by means of a nut 114
said chamber, a motor valve block closing the end of said
threaded to the outwardly extending end of the high
motor chamber remote from said reservoir, said motor
pressure discharge conduit 71. The device may, of course,
valve block including inlet and exhaust passages, and a
be provided with suitable gaskets and seals, which have
not been described in detail, without departing from the 20 throttle valve, a hydraulic valve block interposed between
spirit of the invention.
The ?exibility of the device in its adaptations is be
said motor chamber and said reservoir, said hydraulic
valve block including a pumping chamber of reduced size
and hydraulic inlet and discharge passages, a piston re
lieved apparent from the foregoing description, and as
cipr-ocable in said pumping chamber and having a portion
shown in FIG. 9, a hydraulic ram may be readily applied
directly to one end of the tool and a suitable adaptor to the 25 extending into said motor chamber for coaction with said
opposite end, the ram cylinder 117 being screwed directly
motor piston, tubular member forming a high pressure
to the end of the high pressure discharge conduit 71 and
the adaptor 118 being ‘attached to the valve block 14‘ by
hydraulic discharge passageway extending axially from the
means of screws 119 or the like to provide spacing and
attachment means. Obviously, high pressure hydraulic
?uid developed by the tool is thus conducted to the interior
of the cylinder 117 and causes outward movement of the
ram 120 to perform the desired work.
By means of the fact that all of the major components
are axially alined with the hydraulic and pressurized ?uid 35
discharge passage formed in said hydraulic valve block
through said hydraulic reservoir and out the adjacent end
of said body, and a generally U-shaped actuating lever
having its legs swingably mounted on said hydraulic valve
block with its connecting portion cooperable with said
throttle valve to operate the same upon swinging move
ment in one direction.
3. A ?uid actuated hydraulic pump comprising, a uni
circuitry formed in the respective valve blocks radiating
tary body having a motor chamber formed in one end
and a hydraulic reservoir in the other end axially alined
from the main central axis of the device, manufacture
with said motor chamber, a motor piston reciprocable
of the improved unit is facilitated and operation is sim
within said chamber, a motor valve block closing the end
pli?ed by use of a single control lever. In this connection,
it is noteworthy that the various ‘air and hydraulic ?ow 4:0 of said motor chamber remote from said reservoir, said
motor Valve block including inlet and discharge passages
passages may be readily formed by simple machining
and a throttle valve, a hydraulic valve block interposed
operations with all valves being easily accessible. Also,
between said motor chamber and said reservoir, said
since the axis of the throttle valve and that of the hy
hydraulic valve block including a pumping chamber of
draulic release valve lie in different radial planes relative
to each other with both of these axes being perpendicular 45 reduced size and hydraulic inlet and exhaust passages
and a release valve, a piston reciprocable in said pumping
to the major axis as illustrated diagrammatically in FIG.
chamber and having a portion extending into said motor
10, a simple readilly operable lever for controlling both
chamber for coaction with said motor piston, and an
the air and hydraulic circuitry and adaptable for remote
actuating lever having a pair of legs swingably mounted
control may be provided.
on opposite sides of said hydraulic valve block and a
The motor piston is freely slidable within the motor
connecting portion cooperable with said throttle valve to
chamber and has but a single bearing point contact on
operate the same upon swinging movement of said lever
the rounded head 51 of the pump piston so that side
in one direction, said lever also being cooperable with
thrusts and the like are eliminated. In addition, the ?uid
said release valve to control the same.
motor is controlled by a single freely slidable spool valve
4. A ?uid actuated pump according to claim 3, wherein
37 directly responsive to the action of the motor piston
the throttle actuating portion of the lever lies in one
48 in one direction and responsive to pressure of ?uid
plane and the release valve controlling portion of the
exhausted from the motor chamber 46 for its movement
lever lies in another plane located outwardly of the plane
in the opposite direction, and such control valve structure
of said throttle actuating lever.
is extremely simple and positive in its action with the
5. A ?uid actuated hydraulic pump comprising, a body
flow ports and passages being constantly kept clean and
having a motor chamber formed therein, a motor piston re
free of contaminents.
ciprocable within said chamber, a motor valve block
While the structure of the improved device has been
closing one end of said motor chamber, said motor valve
shown and described herein in considerable detail, it is
block including ?uid inlet and exhaust passages and a
not intended to thereby unnecessarily restrict the inven
throttle valve, a hydraulic valve block closing the other
tion since various modi?cations within the scope of the
end of said motor chamber, said hydraulic valve block
appended claims may occur to persons skilled in the art
including a pumping chamber and hydraulic inlet and
to which the invention pertains.
We claim:
.
1. A ?uid actuated hydraulic pump comprising, a
unitary body having a motor chamber formed in one end
and a hydraulic reservoir in the other end axially alined
with said motor chamber, a motor piston reciprocable
within said chamber, a motor valve block closing the end
of said motor chamber remote from said reservoir, said
motor valve block including inlet and exhaust passages, 75
exhaust passages and a pressure release passage, a valve
in said hydraulic valve block controlling said release
passage, a piston reciprocable in said pumping chamber
and operable by said motor piston, a lever swingably
mounted on said hydraulic valve block, said lever having
a portion cooperable with said throttle valve to operate the
same upon swinging movement in one direction, and valve
actuating means carried by another portion of said lever
3,041,975
and cooperable with said release valve to open said re
lease passage upon swinging movement of said lever in the
draulic exhaust passage for resiliently urging the same to
seated position.
opposite direction.
9. A ?uid actuated hydraulic pump comprising, a uni
6. A ?uid actuated hydraulic pump ‘comprising, a uni
tary body having a motor chamber formed therein, a
tary body having a motor chamber formed therein, a
motor piston reciprocable within said chamber, a motor
motor piston reciprocable within said chamber, a motor
valve block closing one end of said motor chamber, said
valve ‘block closing one end of said motor chamber, said
motor valve bloc-k including air inlet and exhaust passages,
motor valve block including ?uid inlet and exhaust pass
a hydraulic valve block closing the other end of said motor
ages and a throttle valve, a hydraulic valve block closing
chamber, said hydraulic valve block including a pumping
the other end of said motor chamber, said hydraulic valve 10 chamber of reduced size and hydraulic inlet and exhaust
block including a pumping chamber of reduced size and
passages, a piston reciprocable in said pumping chamber
hydraulic inlet and exhaust passages and a pressure release
and having a portion coacting with said motor piston, a
passage, a release valve in said hydraulic valve block norm
tubular member forming a high pressure hydraulic dis
ally seated in said release passage to close the same, a
charge passageway extending from the exhaust passage
piston reciprocable in said pumping chamber operable by 15 formed in said hydraulic valve block axially away from
said motor piston, and an actuating lever pivotally
the adjacent end of said body, and a ?exible membrane
mounted on said hydraulic valve block, said lever having
having one end secured to the periphery of said hydraulic
a portion cooperable with said trottle valve to operate
valve block and the other end secured about said tubular
member remote from said hydraulic valve block for con
the same upon swinging movement in one direction, and
?ning reserve ?uid therein.
means formed on the lever pivot for cooperation with
‘10. A ?uid actuated hydraulic pump comprising, a uni
said release valve to unseat the same and open said release
tary body provided with a removable portion forming a
passage upon swinging movement in the opposite direction.
7. A ?uid actuated hydraulic pump comprising, a uni
motor chamber, a motor piston reciprocable within said
chamber, a motor valve block removably secured to and
tary body having a motor chamber formed therein, a
motor piston reciprocable within said chamber, a motor 25 closing one end of said motor chamber, said motor valve
block including air inlet and exhaust passages, a hydraulic
valve block closing one end of said motor chamber, said
motor valve block including inlet and exhaust passages and
valve block closing the other end of said motor chamber,
said hydraulic valve bloc-k including hydraulic inlet and
‘a throttle valve, a hydraulic valve ‘block closing the other
exhaust passages and a threaded bore opening at one end
end of said motor chamber, said hydraulic valve block
into said motor chamber, a threaded cartridge removably
including a pumping chamber of reduced size and by
con?ned within said bore and having a pumping chamber
‘draulic inlet and exhaust passages and a pressure release
extending therethrough, and a piston reciprocable in said
passage, check valves in said hydraulic valve block con
pumping chamber and having a portion extending out
trolling ?ow through said hydraulic inlet and exhaust
wardly from said cartridge into said motor chamber said
passages, a release valve in said hydraulic valve block
normally seated in said release passage to close the same, 35 motor piston being accessible upon removal of said motor
valve block and said cartridge and its piston being acces
a piston reciprocable in said pumping chamber operable
sible upon removal of said motor chamber forming por
by said motor piston, an actuating lever pivotally mount
tion.
ed on opposite sides of said hydraulic valve block, said
11. A ?uid actuated hydraulic pump comprising, a uni
lever having a portion cooperable with said throttle valve
to operate the same upon swinging movement in one direc 40 tary body having a motor chamber formed therein, a
motor piston reciprocable within said chamber, a motor
tion, means formed on one of the pivots of said lever for
cooperation with said release valve to unseat the same
and ‘open said release passage upon swinging movement of
valve block closing one end of said motor chamber, means
forming a passageway in said motor valve block for sup
plying pressurized ?uid to the adjacent end of said motor
said lever in the opposite direction, and means accessible
through the other of said lever pivots and coacting with 45 chamber, a throttle valve for controlling the ?ow of pres—
surized ?uid through said supply passageway, means form
the valve controlling the hydraulic exhaust passage for re
ing an exhaust passageway in said motor valve block
siliently urging the same to seated position.
communicating with opposite ends of said motor chamber,
8. A ?uid actuated hydraulic pump comprising, a uni
a one way check valve for said exhaust passage normally
tary body having a motor chamber formed therein, a
motor piston reciprocable within said chamber, a motor 50 sealing the same from ingress of exterior air and foreign
matter while permitting escape of exhaust air therefrom,
valve block closing one end of said motor chamber, said
a hydraulic valve block closing the other end of said
motor valve block including inlet and exhaust passages
motor chamber, said hydraulic valve block including a
and a throttle valve radiating therefrom, a hydraulic valve
pumping chamber of reduced size and hydraulic inlet and
block closing the other end of said motor chamber, said
hydraulic valve block including a pumping chamber of 55 exhaust passages, and a piston reciprocable in said pump
ing chamber and having a portion coacting with said
reduced size and hydraulic inlet and exhaust passages
motor piston.
and a pressure release passage, said motor chamber and
'12. A ?uid actuated hydraulic pump comprising, a uni
pumping chamber being coaxially alined, check valves in
tary body having a motor chamber formed therein, a
said hydraulic valve block, controlling ?ow through said
motor piston reciprocable within said chamber, a motor
hydraulic inlet and exhaust passages, a release valve in 60 valve block closing one end of said motor chamber, said
said hydraulic valve block normally seated in said release
motor chamber having a vent communicating therewith
passage to close the same and having an actuating portion
remote from said motor valve block, means forming a
radiating from said hydraulic valve block in a different
passageway in said motor valve block for supplying pres
radial plane than that of said throttle valve, a piston recip
surized ?uid to the adjacent end of said motor chamber,
rocable in said pumping chamber, an actuating lever piv
a throttle valve for controlling the ?ow of pressurized
otally mounted on opposite sides of said hydraulic valve
?uid through said supply passageway, means forming an
block, said lever having a portion cooperable with said
exhaust passageway in said motor valve block communi
throttle valve to operate the same upon swinging move
cating intermittently with the adjacent end of said motor
ment in one direction and having one of its pivots coupled 70 chamber and constantly with the remote end of said
to the actuating portion of said release valve whereby said
motor chamber, resilient cup-shaped member covering
release valve is unseated to open said release passage upon
said exhaust passage to provide a one way check valve
normally sealing said passage from ingress of exterior air
swinging movement of said lever in the opposite direction,
and foreign matter while permitting escape of exhaust air
and means accessible through the other of said lever pivots
and coacting with the check valve controlling the hy 75 therefrom, a hydraulic valve block closing the other end
a,oa1,975
12
1l
way and the adjacent end of said motor chamber and
between said exhaust passageway and the adjacent end
of said motor chamber, passage means extending be
tween said motor chamber and one end of said spool
valve and controlled by said motor piston for intermit
tently admitting pressurized ?uid from said motor cham
ber to said valve end to reciprocate said valve in one
direction, said valve having a portion extensible into said
of said motor chamber, said hydraulic valve block in
cluding a pumping chamber of reduced size and hydraulic
inlet and exhaust passages, and a piston reciprocable in
said pumping chamber and having a portion coacting
with said motor piston.
I
13. A ?uid actuated hydraulic pump comprising, a uni
tary body having a motor chamber formed therein, a
motor piston reciprocable within said chamber, a motor
valve block closing one end of said motor chamber,
motor chamber for direct operating contact with said mo
\ ieans forming a passageway in said motor valve block 10
for supplying pressurized ?uid to the adjacent end of said
motor chamber, a throttle valve for controlling the ?ow
of pressurized ?uid through said supply passageway, means
forming an exhaust passageway in said motor valve block
tor piston for reciprocation thereby in the opposite direc
tion by direct action of said ‘motor piston, a hydraulic
valve block closing the other end of said motor cham
ber, said hydraulic valve block including a pumping
chamber of reduced size and hydraulic inlet and exhaust
passages, and a piston reciprocable in said pumping cham
ber and coacting with said motor piston.
communicable with the adjacent end of said motor cham
her, a reciprocable spool valve freely slidable in said
15. A ?uid motor comprising a body having a motor
motor valve block and operable to establish communica
chamber formed therein, a piston reciprocable within said
tion alternately between said supply passageway and said
chamber, a valve block closing an end of said motor
motor chamber and between said exhaust passageway and
said motor chamber, said valve having di?erential areas 20 chamber, means forming a passageway in said valve
block for supplying pressurized ?uid to the adjacent end
at the opposite ends thereof and being reciprocated in one
of said motor chamber, a throttle valve for controlling the
direction by pressurized ?uid supplied from said motor
?ow of pressurized ?uid through said supply passageway,
chamber and in the opposite direction by direct action of
means forming an exhaust passageway in said valve block
said motor piston, a hydraulic valve block closing the
other end of said motor chamber, said hydraulic valve 25 communicable with said motor chamber, a reciprocable
spool valve freely slidable in said valve block and op
block including a pumping chamber of reduced size and
erable to establish communication alternately between
hydraulic inlet and exhaust passages, and a piston recip
said supply passageway and said motor chamber and
rocable in said pumping chamber and coacting with said
between said exhaust passage and said motor chamber,
motor piston.
and passage means extending between said motor cham
14. A ?uid actuated hydraulic pump comprising, a
ber and one end of said spool valve and controlled by
unitary body having a motor chamber formed therein,
said piston for intermittenly admitting pressurized ?uid
a motor piston reciprocable within said chamber, a mo
from said motor chamber to said valve end to recipro
tor valve block closing one end of said motor chamber,
cate said valve in one direction, said valve having a por
means forming a passageway in said motor valve block
for supplying pressurized ?uid to the adjacent end of 35 tion extending into said motor chamber for direct contact
with said motor piston for reciprocation thereby in the
said motor chamber, a throttle valve for controlling the
opposite direction by direct action of said motor piston.
?ow of pressurized ?uid through said supply passageway,
means forming an exhaust passageway in said motor valve
block communicable with the adjacent end of said motor
chamber, a reciprocable spool valve loosely slidably con
?ned in said motor valve block and operable to establish
communication alternately ‘between said supply passage
40
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,155,098
2,588,164
Mohr _______________ __ Apr. 18, 1939
Roberts et al. ________ __ Mar. 4, 1952
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