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Патент USA US2602299

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July 8, 1952
Filed Sept. 1, 1949
Patented July 8, 1952
Moron ,
Benjamin "N. Ashton and Eugene 7V.‘ Barkow,
Kingston, N. Y., assignors to ElectrolIncor
porated, Kingston, N. Y., a corporation of
Application September 1, 1949, Serial No. 113,526 _
4 Claims.
(01. 60—97)
The pressure port of the pump is connected by
This invention relates to systems for controlling
means of a conduit I8 to an equalizing valve I9
the movement of a plurality of hydraulically ac
which includes two similar, separate valve ele
tuated motors to equalize their movements. More
particularly, the invention relates to control valve
The conduit I8 isprovided with a pair of branch
systems for regulating the supply of ?uid deliv
23 and 24 which are connected to ports
ered to a plurality of hydraulic-motors, such as,
25 and 26 communicating with the lower ends of
for example, ‘hydraulic rams or jacks to cause
the valve elements 20 and 2]. The valve I9 also
equal movement of the jacks.
includes a pair of ports 21 and 28 which are con
In accordance with the present invention, a
nected by means of the conduits 29 and 30 to the
typical system may include at least two equalizing 10 lower
ends of the jacks II_ a'nd‘IZ, respectively.
valves of a type having valve elements displace
and 30» are also provided with re
able against a biasing force by the pressure of the
3I and 32 by means of
fluid supplied to at least two hydraulic motors, the
which liquid vis drained from the jacks II and I2
motors being in turn connected to and controlling
the biasing force exerted on the movable valve 15 to the reservoir I'1 under the control of the valve
elements. The relation of the biasing force and
The valve elements 20 and 2| include ball ele
the movement of the motors is such that any
ments 34 and 35 which normally close the ports
tendency of one of the motors to move faster than
25 and 2B. The ball elements are urged down
the other motor will increase the biasing force op
wardly by meansof the springs 36 and 31 mount
posing the ?ow of liquid to the faster moving mo 20 ed in the valve elements and bearing at their up
tor and thereby reduce the pressure and volume of
per ends against the disc elements 38 and 39.
the liquid actuating the faster moving motor to
The disc elements of the valves 20 and 2| are
[reduce its speed.
mounted on the ends of push rods 40 and M
Systems of the type generally referred to above
which extend through the top of the valve casing
are useful for many purposes, for example, in the 25 and have their ends in engagement with a yoke or
operation of jacks for lifting the front or rear of
rock lever 42 which is mounted on the lower end
a vehicle, in systems wherein a platform is to be
of a plate 43 forming the spider of a differential
elevated and kept level during its movement and
for actuating wing flaps and landing gear of air
The rate of flow of the liquid to the jacks I I and
craft and the like.
I2 may be controlled by varying the biasing force
For a better understanding of the present in
of the springs 36 and 31 against ball valves 34 and
vention, reference may be had to the accompany
35. . Thus, if the spring 36 is compressed to a
ing drawing, in which:
‘greater degree than the spring 31 by moving the
Fig. 1 is a view in elevation of a typical system
push rod or stem 40 downward, more of the liquid
embodying the present invention with a portion 35 will tend to flow to the jack I 2 than to the jack I I.
of the hydraulic circuit illustrated diagrammati
The reverse is true also so that when the spring
cally; and.
31 is compressed more than the spring 36', more
Fig. 2 is a view in elevation of the differential
of the liquid will flow to the jack II than to the
and the equalizing valves, one of said valves be
jack I2. Advantage is taken of this action to pro
ing partially broken away to show details thereof.
vide a control for the valve which will cause the
The form of the invention chosen for purposes
jacks‘ I I and I2 to move equal distances at all
of illustration is adapted to elevate and lower a
times. This is accomplished by ?xing to the pis
platform I0 although it will be understood that
ton rods I3 and I4 laterally projecting arms 45
the same system may be used for lifting vehicles
45 and 46 and connecting to these arms ?exible ca
or other devices.
bles or tapes 41 and 48 for driving a differential
As shown in Fig. 1, the platform I0 is supported
system by means of which the movement of the
at its opposite ends by a pair of hydraulic jacks
push rods 40 and M is controlled. vAs shown in
II' and I2, each of which has a reciprocable pis
Fig. l, the cables 41 and 48 are wound in opposite
ments20 and2I.
ton and piston rod structure I3 and I4 therein.
directions around the pulleys 49 and 50 which are
The jacks II and I2 may be mounted upon a 50
mounted on the ends of'the shafts 5| and 52.
frame member I5 which is supported on the floor
These shafts are rotatably mounted in suitable
or in any other desired way.
bearing blocks 53 and 54 which are ?xed to the
Hydraulic pressure for actuating the jacks to
project the piston rods I3 and I4 is suppliedby
means of a motor driven pump I6 which is con
nected to a reservoir I1 for liquid.
support I5.
The inner ends of the shafts 5| and 52 are
connected to the differential “to change the
biasing pressure on the valves in accordance with
a differential rate of movement of the shafts
5| and 52.
As indicated above, the diiferential 44 includes
a spider plate 43 which carries rotatably on its
opposite sides a pair of idler pinions' 58 and 59
which mesh with each other through a slot 60
through the spider 43. The pinion 58 meshes
liquid from a pressure source to a pair of hy
draulic motors to operate them at related speeds;
the combination of a pair of check valves having
spring biasing means normally urging them
toward closed position, oneofn said valves being
interposed between said‘ source and one of said
motors and the other being interposed between
said source and the other motor to regulate the
with a gear 6| ?xed on the end of the shaft 52., , . supply of liquid to said motors, said check valves
and the pinion 59 meshes with a gear 62 ?xed 10_ being urged to open position by pressure of ?uid
to the end of the shaft 5|. The shaft 52 extends
from said pressure source in opposition to the
through the gear 6|, the spider '43 and the gear»
62 but is rotatable relative to the spider 43 and
the gear 62.
spring biasing‘ means, a differential having a pair
of interconnected relatively rotary members and
' a third member maintained stationary when said
The valve member I9 is maintained in ?xed 15 rotary members are rotated at a predetermined
spaced relation to the diiferential by means of .
relative speed, and movable when the relative
a pair of spaced apart arms 63 and 64 which are
speed of said rotary members varies, a connec
?xed to the valve l9 at their lower ends and
tion between said third member and both of said
journalled on the shafts 5| and 52, respectively.
valves to adjust the force exerted on the check
The valve |9'may be secured against rotation 20 valve by said spring biasingv means to vary the
to the frame l 9 or in any suitable way. - i
rate of flow of liquid through’ said» valves and
The differential mechanism operates as fol~
means for connecting each of said relatively
lows. So long as the shafts 5| and 52 rotate in
rotatable membersto a different one of ‘said
opposite directions at the same speed, the idler
motors to render said third member responsive
pinions 58 and 59 idle freely without-causing 25 to the relative speeds of said motors.
any movement of the spider 43. However, if one
2. In a system for regulating the relative
of the shafts rotates faster than the other, due
speeds of a pair of hydraulic ‘motors/driven by
to more rapid movement of the piston rod l3 or
liquid supplied from a source of liquid under
M, this diiferential movement will cause the
pressure; the combination of a pair of valves,
spider 43 to rock in one direction or :the other 30 eachrbeing interposed between said source and
around the axes of the shafts 5| and 52. ‘Such
a different one of said motors, each of said valves
rocking movement of the spider will cause a cor
including a check valve member and biasing
responding movement of the yoke or lever 42
means normally urging said member to closed
with the result that one or the other of the push
position in opposition to now of liquid to its
rods 40, 4| will be depressed, thereby increas
ing the pressure on the corresponding ball valve
element 34 or 35. The increased pressure on
corresponding motor, saidchecl: valve member
being urged to open position by ?ow of liquid to
its corresponding motor in opposition to said
the corresponding ball valve element will cause
biasing means, means for varying the biasing
it to resist the ?ow of liquid to the jack or motor
force of said biasing means, a differential having
which is travelling at the higher speed. As a 40 a pair of interconnected relatively rotatable
result, the speed of this jack is reduced so that
members and a third member movable in re
the jacks move at the same rate and through
the same distance.
The cables 41 and 48 are .rewound on their
pulleys as the piston rods l3 and. M are retracted
sponse to variation of relative rotation ‘of said
pair of members from a predetermined ratio, a
connection between said third member and said
45 means for varying the biasing action for actu
by means of the springs 66 and 61 or counter
ating the latter to regulate the flow of liquid
weights which are connected by means of the
to the motors, and means connecting each rotat
?exible cables 68 and 69 to the drums "I0 and ‘H
able member to a diiferent one of said motors
about which the cables are wound. The cables
to render said third member responsive to the
68 and 69 are wound in such a direction that the
relative speeds of said motors.
springs are tensioned as the pistons I3 and it! 50
3. In a system for regulating the relative
are projected, thereby normally tending to re—
speeds of a pair of hydraulic motors driven by
turn the shafts 5| and 52 in a proper direction
liquid supplied from a source of liquid under
to rewind the cables 41 and 48 on their respec- ‘
pressure; the combination of a pair ‘of valves,
tive drums 49 and 50.
each being interposed between said source and
While the invention has been described as ap
a different one of said motors, each of said valves
plied to the control of two jacks, it will be un
including a valve member and biasing means
derstood that rotary hydraulic motors vmay be
normally urging said member to closed position
controlled in the same way by connecting these
in opposition to ?ow of liquid to its corresponding
motors to the shafts 5| and 52, either directly
motor, separate shiftable plungers for varying
or by means of gearing which causes the shafts
the biasing action of said biasing means, a rock
5| and 52 to rotate in the desired directions. In
able member engaging said plungers to shift
this way, the motors can be caused to rotate at
them selectively to increase the biasing force on
the same speed even though their character
the valve members, a differential mechanism
istics may differ, as is often the case.
having a pair of relatively rotatable intercon
It will be understood further that the differ
nected shafts, and a third member movable in
ential may be modi?ed substantially and that
response to variation in the relative rotation of
the several elements may be connected and sup
said pair of members from a predetermined ratio,
ported in di?‘erent ways than that illustrated,
a connection between said third member and
depending upon space requirements and the ,_ said rockable member for rocking the latter upon
purpose for which the device is to be used.
movement of said third member, and means for
Therefore, the form of the invention described
connecting each of said shafts to a different one
above should be considered as illustrative and
of said motors to render said third member
not as limiting the scope of the vfollowing claims.
responsive to the relative'speeds of said motors.
We claim:
4. An equalizing valve for regulating the rela
1. In a system for regulating the supply of 75 tive speeds of a pair of hydraulic motors com
prising a valve casing having separate chamber
therein, each chamber having an inlet port, an
outlet port and a valve seat between the inlet
port and the chamber, a valve member in each
The following references are of record in the
?le of this patent:
chamber engageable with its valve seat, said‘ 5
valve member and seat constituting a check
valve permitting ?ow of liquid from said inlet
Coyle ___________ __ Apr. 26, 1910
port to said outlet port and preventing now of
Bristol __________ __ Junev 12, 1934
liquid from said outlet port to said inlet port,
Schoelm _________ __ Sept. '7, 1943
spring means in each chamber urging the valve 10 2,328,849
Monier __________ __ June 6, 1944
member toward its seat in opposition to ?uid
Anthony _________ __ Oct.’ 10, 1944
pressure at said inlet port, a plunger member for
et a1 ____ __ May 22, 1945
each chamber engaging the spring means there
Kopp ____' ________ __ Aug. 7, 1945'
in, said plunger member being movable relative
Edge ____________ __ Mar. 23,1948 '
to said valve member to vary the pressure of the 15 2,438,389
spring means on the valve member, and means
engaging both of the plungers for selectively
moving them.
Furer et a1 _______ __ June 14, 1949
Purcell __________ -_ Oct. 18, 1949
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