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Патент USA US2291229

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July 28, 1942.
J. P. JOHNSON
2,291,229
FLUID‘ METERING DEVICE
Filed April 25, 1940
INVENTOR.
ATTORNEY.
2,291,229
Patented July 28, 1942
UNH‘EEE STATES PATENT @FE'IQE
2,291,229
FLUID METERING DEVICE
James P. Johnson, Shaker Heights, Ohio
App‘iication April 25, 1940, Serial No. 331,585
11 Claims. (Cl. 137-165)
metering device embodying the present inven
This invention relates to a ?uid metering de
vice capable of handling an introduced ?uid. at
varying pressures and effecting its discharge at
a plurality of points in quantities which bear a
constant ratio one with another regardless of the
pressure of the introduced ?uid.
The metering device as designed is-especially
useful in connection with the operation of re
tractible landing gears, and like mechanisms,
Where vsimultaneous and uniform operation is
essential. Heretofore, in hydraulically actuated
mechanisms of this type oil from a single source
was supplied to a pair of such mechanisms for
simultaneous operation. If one mechanism oper
ates more freely than the other it will be seen
that. the one will operate ahead of the other,
which condition, especially in retractible land
ing gears, is of serious consequence. It is there
fore, an object of the present invention to pro
vide a fluid metering device adapted to receive
a ?uid under various pressures from a single
source and to discharge the same in equal or
different quantities at a plurality of points where
by the mechanisms connectedv to the respective
outlets are operated simultaneously and uni- '
formly regardless of the differences in pressures
required to actuate the different mechanisms.
Another object of the present invention is to
provide a compensating means actuated‘ by the
relative differences in pressures required for
simultaneous operation of the mechanisms where
by only that volume of ?uid required for indi
vidual operation is permitted to flow in relative
proportions.
tion.
Figure 2 is a longitudinal vertical sectional view
taken substantially along the line 2-2 in Fig
ure 3 and showing details of the metering de
vice.
Figure 3 is a transverse sectional view taken
along lines 3—-3 in Figure 2 and showing, fur.
ther details of the invention.
Figure 4 is a longitudinal vertical sectional view
similar to that shown in Figure 2 but illustrating
a modi?ed construction embodying the invention.
Figure 5 is a transverse sectional View taken
along line 5—5 in Figure 4 and showing de
tails of the modi?ed form.
In the drawing I have illustrated a metering
device of preferred construction embodying the
present invention but it should be understood
thatthe invention is not so restricted and it
may be otherwise adapted by those skilled in the
art. As illustrated in the accompanying draw
ing, the metering device comprises a housing
[9, preferably made of aluminum or other suit
able light weight material, which is closed at its
outer end but open at its inner end. The hous
ing. it includes an outwardly extending central
ly disposed portion H preferably elongated in
transverse section as more clearly shown in Fig
ure 5, and an integral relatively enlarged out
,Wardly extending marginal disposed portion [2,
the outer face/l3 of which provides an attach
ing ?ange for a purpose to be later described.
The housing It‘! is provided with a pair of bores
M and I5 of suitable diameter which extend in
wardly from the face l3 and are disposed rela
tively with their longitudinal axes in parallel
spaced relation. The bores M and i5 each termi
nate inwardly from the closed end of the exten
automatically and actuated by pressure, differ
sion H as more clearly shown in Figure 2 and
ences in the ?uid outlet lines.
Another object’ of the present invention: is to to the extension is provided with a connecting pas
sageway it of relatively small diameter afford
provide means for adjusting the means. for rel
ing communication between the respective bores
atively varying the volume of ?uid, whereby a
for a purpose to be later described. The hous
predetermined relation may be effected to adapt
ing It) is provided, adjacent its inner’ end, with
the metering device for different conditions.
Another object of the present invention is to
provide means for relatively varying the. vol
ume of fluid transmitted to each mechanism
Another object of‘ the present invention is to
provide a metering device which is simple in
construction and assembly, efficient inoperation,
and inexpensive to manufacture.
With the objects above indicated, and other
objects hereinafter explained in view, my in- -
vention consists in the construction and combi
nation of elements hereinafter described and
claimed.
Referring to the drawing,
Figure 1 is an end elevational view of the‘
a pair of laterally extending projections l1 and
18 having internally tapped openings I9 and 20'
respectively the inner ends of which communi
cate with annular passageways 2| and 22 formed
on the inside of the housing and disposed in en
circling relation with respect to the adjacent
bores. These tapped openings i9 and 2t! are
adapted for suitable connection with a pair of
mechanisms whose simultaneous and uniform op
eration are desired in a manner which Will be
later- more fully described, and while only two
2
2,291,229
of such openings are here illustrated it should
be understood that any number may be employed
with slight modi?cations.
7
A pair of cylinders 23 and 24, of identical con
struction, are slidably mounted in the respective
bores I4 and I5 and have their inner ends in
and 43 and by axial adjustment of the plugs the
springs may be desirably tensioned. Here again
the load of the springs should be relatively small
and are employed for yieldably urging the valve
members toward their seats.
'
In order that the passageways 40 and 4| in the
spaced relation with respect to the bottom of the
cylinders may be placed in communication with
bores and outer portions projecting a substantial
distance beyond the face |3 of the housing as
the outlet openings l9 and 20 respectively, the
cylinders are provided with transverse openings
more clearly shown in Figure 2. The outer ends 10 50 and 5| respectively, which extend entirely
of the cylinders 23 and 24 are provided with por
through the body of the cylinders and are posi
tions 25 and 26 of reduced diameter thus provid
tioned for relative alignment with the annular
ing laterally extending ?anges 21 and 28 at their
passageways 2| and 22. In Figure 2 these trans
outer ends. In the operation of the present de
verse openings 50 and 5| are shown positioned
considerably inwardly with respect to the an
vice it is essential that the cylinders 23 and 24
move in opposite relative directions and to effect
nular passageways 2| and 22 and this relation
ship is eifected by the position of the adjusting
such movement a link 29 is provided which has
a pair of bifurcated projections 30 and 3| dis
member 34. The relationship of these transverse
posed on diametrically opposite sides in encir
openings 50 and 5| and annular passageways
cling relation with the adjacent reduced portions 20 2| and 22 will be predetermined by the relative
25 and 26 and between the ?anges and adjacent
characteristics of the ?uid actuated mechanisms
ends of the cylinders as more clearly shown in
and when once adjusted for a particular condi
Figure 3. The link 29 has a central opening
tion will need no further attention. It will be
32 to receive the outer end 33 of an adjustable
obvious that the cylinders may be moved out
member 34 screwthreadedly mounted in the ad- ‘
jacent inner end of the housing and a screw
wardly axially by removing the pivot pin 35 and
driver slot 35 is provided in the outer'end 33
by means of which the adjustable member may
be predeterminedly positioned. The link 29 and
adjustable member 34 and by turning the mem
the end 33 of the adjustable member are pro
vided with aligned openings through which a
headed pin 36 extends and is prevented from
accidental disengagement by a cotter pin 31
mounted on the outer free end of the pin. It will
be noted that inasmuch as the link 29 is pivotally :
inserting a screw-driver in the slot 35 in the
ber in the proper direction it will cause the link
29 to move outwardly and in turn move the
cylinders until the proper relationship is effected
mounted at its mid-portion about the end 33
of the adjustable member the bifurcated projec
between the transverse openings and the an
nular passageways after which the pin is rein
serted and the device functions as heretofore
described. It will also be observed that the
movement of the cylinders in opposite directions
brings one of the transverse openings more into
alignment with one annular passageway and the
tions 30 and 3| move in opposite directions
other more out of alignment, thus permitting a
about the pivot and thus, being operatively con
nected with different cylinders, eiTeots a positive
greater quantity of ?uid to pass through one out
let Opening than the other. By reason of the
link connection this relationship of discharged
movement of the latter in their direction of
movement. The cylinders 23 and 24 however
?uid is maintained in a de?nite ratio.
are kept in proper alignment by the walls of
A cover member 52, preferably of aluminum or
other suitable light weight material, has an outer
the bores in which they are slidably mounted.
Disposed at the inner ends of the bores l4 and 45 end wall 53 and a laterally disposed marginal
?ange 54 the inner face 55 being of the same
I5 are coiled springs 38 and 39 having identical
general contour as the face I3 on the housing
characteristics, the inner end of the springs
being disposed in abutment with the bottoms of
to which it is detachably connected by screws
56. A gasket 51 is disposed between the adjacent
the bores while the outer ends of the springs are
in abutment with the inner ends of the cylinders. 50 faces l3 and 55 to provide a ?uid tight seal there
These springs are preferably of the same tension
between. The cover member encloses the outer
adjacent ends of the cylinder 23 and 24 and is
and are employed to exert an outward force on
suitably spaced to provide a ?uid chamber 58
each cylinder so as to maintain them in balanced
relation but the load should be relatively small.
on the inside of the cover member as more clearly
The cylinders 23 and 24 are provided with cen 55 shown in Figure 2. The end wall 53 of the cover
trally disposed passageways 4i] and 4| of rela
member 5| has a tapped opening 59 in communi
tively small diameter extending inwardly a sub
cation with the chamber 58 and the opening is
stantial distance from the outer ends of the
adapted for communication with a suitable source
cylinders as more clearly shown in Figure 2. The
of ?uid under pressure. Usually the source of
passageways 40 and 4| communicate with cen 60 ?uid is the well known high pressure type of
trally disposed openings 42 and 43 of relatively
hydraulic pump from which ?uid, usually oil, is
larger diameter extending inwardly from the
discharged under high pressure which pressure
inner ends of the cylinders and a pair of tubular
varies considerably. Heretofore this discharged
valve members 44 and 45, having closed inner
?uid was connected directly with the mecha
ends, are slidably mounted within the openings 65 nisms to be actuated and if the mechanisms were
42 and 43, the closed ends being adapted for in
at all different in their mechanical structures,
terrupting communication between the passage
one would function ahead of the other. In oper
ways 40 and 42, and the passageways 4| and 43.
ating landing gears, where simultaneous and uni
Coiled springs 46 and 41 of identical character
form operation is essential the heretofore de
istics are disposed centrally within the openings
scribed metering device was developed for effect
42 and 43 and have their inner ends in abutment
ing such operation regardless of mechanical dif
with the closed ends of the valve members 44 and
ference in the mechanisms. When the ?uid is
45. The outer ends of the springs are in abut
introduced into the inlet opening 59 it passes
ment with plugs 48 and 49 screwthreadedly
into the chamber 58 and due to the clearances
mounted in the outer ends of the openings 42. 75 between the cylinders and their respective bores,
2,291,229
3
with the adjacent annular passageways 2| and
22 which latter communicate with‘their respec
tive outlet openings I9 and 2.0. Here again the
relative .positions of the transverse openings 50
and 5| and their respective annular passage
provided for the cylinders in the event they
ways are predetermined by suitable adjustment
should operate with any great amount of oscil
of the adjustablemember 34 to adapt the device
lation, or should be caused to vibrate from im
for different conditions. The passageways 40'
pulses imparted from the pump or otherwise.
and ‘4!’ can be madeof different diameters thus
In the operation of the metering device the
inlet opening 59 is suitably connected with a 10 varying the amounts of restriction su?icient to
properly operate the cylinders. ‘As shown in
source of ?uid under high pressure, usually 2. ~
the ?uid ?ows into the inner ends of the bores
?lling the same. The inner ends of the bores
are also in communication by the connecting
passageway l6 and thus a dampening eifect is
hydraulic pump from which the ?uid is dis
charged under varying pressures, and the outlet
Figure 4 the cylinder 24 would never assume the
position shown in operation, for at no time is a
openings l9 and 20 connected respectively with
complete shutoff possible, as the nearly closing
a pair of mechanisms whose simultaneous and
uniform operation is desired. As the ?uid under
pressure enters the chamber 58 in the cover
of .one transverse opening in its respective cylin
der opens the other a corresponding amount and
thus permits discharge of?uid in direct propor
tion from each outlet opening.
member 5|, it is forced to ?ow with high velocity
through each of the long relatively small diam
eter passageways 46 and 4! in the respective cyl
ment of the invention it is to be understood that
lnders 23 and 24. At the end of each passage
way the ?uid engages the adjacent yieldable valve
members 44 and 45 moving them inwardly
against the tension of the springs 46 and 61 suf
changes and modi?cations may be resorted to
without departing from the spirit of the inven
tion as de?nedin the appended claims.
?ciently to establish communication with the '
adjacent transverse openings 50 and 5!. Inas
much as the transverse openings 5%) and El are
While ,Ihave described the preferred embodi
I am not to be limited thereto inasmuch as
What is claimed is:
1. A'?uid metering device comprising a hous
ing having a ?uid inlet opening and a pair of
?uid outlet openings, said housing being formed
in communication with the adjacent annular pas
with a pair of relatively spaced bores in com
sageways 2i and 22 respectively the fluid from
the passageways 4B and 4| ?ows through both 31) mon communication with said inlet opening,
each of said bores having a ?uid outlet port
and outwardly from the adjacent communicating
outlet openings [9 and 20 to the pair of ?uid
actuated mechanisms whose simultaneous and
affording communication with different outlet
‘openings; a pair of pistons slidably mounted in
uniform operation is desired. Now if one of the
?uid actuated mechanisms is structurally diifer- I‘
said .bores and each provided with a longitudi
nally extending passageway of relatively small
diameter in common communication at their
outer ends with said inlet opening, each passage
way at its inner ‘end communicating with a lat
cut from the other, no matter how slight, they
willrequire different operating pressures and to
insure simultaneous and uniform operation rela
erally extending port in operative alignment with
tively different volumes of ?uid are transmitted
to the respective mechanisms. This is effected by it) the adjacent outlet port thus affording com
having the cylinders operate in unison in rela
tively opposite directions, the cylinders, control
ling the ?ow of ?uid to the mechanism requir
munication with the respective outlet opening;
resilient means operatively associated with each
piston for exerting a yieldable pressure thereon
and effecting an initial balancing of said pis
ing the lesser pressure to operate, moving in a
direction to restrict the ?ow of ?uid from its 1.3 tons; and means operatively connecting said pis
tons for unitary movement in relatively diiferent
cooperating discharge opening while the other
directions to vary in opposed relation the rela
cylinder is moved in an opposite direction to
tive positions of adjacent ports; said pistons be
increase the ?ow of ?uid from its cooperative
ing movable by a difference in the relative ve
discharge opening. By the pivotal link connec
locities of the ,?uid passing through their respec
tion the cylinders move relatively a predeter
tive passageways whereby the volume of ?uid dis
mined distance and by use of the adjusting mem
charged from each outlet opening will be in de?
ber 34 the relationship between the transverse
nite proportion with one another.
openings and adjacent annular passageways may
2. A ?uid metering device comprising a hous
be predeterminately eifected. If, on the other
hand, the operating pressures required are iden- ' ing having a ?uid inlet opening and a pair of
?uid outlet openings, said housing being formed
tical the relative positions of the cylinders and
with a pair of relatively spaced bores in com
valve members are such as to permit equal vol
umes of ?uid to be discharged from each out
mon Communication with said inlet opening, each
let openings !9 and 23. The use of the valve
members 44 and 45 affords eifective operation ,Y
even where the relative differences in operating
.of said bores havinga ?uid outlet port affording
communication with different outlet openings;
pressures is trivial.
In Figures 4 and 5 I have illustrated a modi
?ed construction embodying the invention but in
which the valve members 44 and 45 shown in the 1
other ?gures have been eliminated. In this case
the passageways 40’ and M’ in the cylinders 23
and 24 are of relatively small diameters and
extend inwardly from the outer ends of the cyl
a pair of pistons slidably mounted in said bores
and each provided with a longitudinally extend
ing passageway of relatively small diameter in
common communication at their outer ends with
said inletiopening, each passageway at its inner
end communicating with a laterally extending
port in operative alignment with the adjacent
outlet port thus aifording communication with
the respective outlet opening; and means oper
inders. The inner ends of the passageways 4G’ T a) atively connecting said pistons for unitary move
ment in relatively different directions to vary in
and 4|’ communicate with the inner ends of the
openings 42 and 43 of relatively larger diameter
opposed relation the relative positions of adja
cent ports; said pistons being movable by a dif
and the transverse openings 55 and 5! are in
communication with the openings 42 and 43.
ference'in the relative velocities of the ?uid pass
The transverse openings 50 and 5-! communicate
ingithrough their respective passageways where
4
2,291,229
pair of pistons slidably mounted in said bores
by the volume of ?uid discharged from each out
and each provided with a longitudinally extend
let opening will be in de?nite proportion with
ing passageway of relatively small diameter in
one another; said housing being provided with a
communicating passageway connecting the inner
common communication at their outer ends with
ends of said bores for e?ectively cushioning the Cl said inlet opening, each passageway at its inner
end communicating with a second passageway
movement of said pistons.
3., A ?uid metering device comprising a hous
of greater diameter to provide a valve seat, the
ing having a ?uid inlet opening and a pair of
inner end of said second passageway communi
?uid outlet openings, said housing being formed
cating with a lateral extending port in opera
tive alignment with the adjacent outlet port thus
affording communication with the respective out
let opening; resilient means operatively associ
ated with each piston for exerting a yieldable
with a pair of relatively spaced bores in common
communication with said inlet opening, each of
said bores having a ?uid outlet port affording
communication with different outlet openings; a
pair of pistons slidably mounted in said bores
and each provided with a longitudinally extend
ing passageway of relatively small diameter in
common communication at their outer ends with
said inlet opening, each passageway at its in
ner end communicating with a laterally extend
ing port in operative alignment with the adja- cent outlet port thus affording communication
with the respective outlet opening; means oper
atively connecting said pistons for unitary move
ment in relatively diiferent directions to vary in
opposed relation the relative positions of adja
cent ports; and adjustable means operatively
connected to said piston connecting means for
moving said pistons bodily to thereby initially
pressure thereon and effecting an initial balanc
ing of said pistons; a valve member slidably
mounted in each of said second passageways and
operatively associated with the adjacent seat for
eifecting a yieldable resistance to the ?ow of
?uid thereby; resilient means operatively associ
ated with each valve member for exerting a pres
sure thereon; and means operatively connecting
said pistons for unitary movement in relatively
different directions to vary in opposed relation
the relative positions of adjacent ports; said
pistons being movable by a difference in the rela
tive velocities of the ?uid passing through their
respective passageways of relatively small diam
eter whereby the volume of ?uid discharged from
each outlet opening will be in de?nite proportion
vary the relative positions of the outlet ports;
with one another.
said pistons being movable by a diiference in
6. A ?uid metering device comprising a hous
the relative velocities of the ?uid passing through
ing having a ?uid inlet opening and a pair of
their respective passageways whereby the volume
?uid outlet openings, said housing being formed
of ?uid discharged from each outlet opening
with a pair of bores disposed in substantially
will be in de?nite proportion with one another.
4. A ?uid metering device comprising a hous 35 parallel spaced relation and in common com
ing having a ?uid inlet opening and a pair of
munication with said inlet opening, each of said
bores having a ?uid outlet port affording com
?uid outlet openings, said housing being formed
with a pair of relatively spaced bores in com
munication with different outlet openings; a
pair of pistons slidably mounted in said bores
mon communication with said inlet opening, each
and each provided with a longitudinally extend
of said bores having a ?uid outlet port affording
ing passageway of relatively small diameter in
communication with different outlet openings; a
common communication at their outer ends with
pair of pistons slidably mounted in said bores
said ?uid inlet opening, each passageway at its
and each provided with a longitudinally extend
inner end communicating with a laterally extend~
ing passageway of relatively small diameter in
common communication at their outer ends with
said inlet opening, each passageway at its inner
- ing port in operative alignment with the adjacent
end communicating with a second passageway of
the respective ?uid outlet opening; means opera
greater diameter to provide a valve seat, the
tively connecting said pistons for unitary move
ment in relatively opposite directions to vary in
inner end of said second passageway communi
cating with a laterally extending port in opera
tive alignment with the adjacent outlet port thus
affording communication with the respective
outlet opening; a valve member slidably mount
ed in each of said second passageways and op
eratively associated with the adjacent seat for
effecting a yieldable resistance to the ?ow of ?uid
thereby; resilient means operatively associated
with each valve member for exerting a pressure
outlet port thus affording communication with
opposed relation the relative positions of adjacent
ports; and resilient means operatively associated
with each piston for exerting a yieldable pres
sure thereon and effecting an initial balancing of
said pistons; said pistons being movable by a
difference in the relative velocities of the ?uid
passing through their respective passageways
whereby the volume of ?uid discharged from
each outlet opening will be in de?nite proportion
thereon; and means operatively connecting said
with one another.
pistons for unitary‘ movement in relatively dif 60
7. A ?uid metering device comprising a hous
ferent directions to vary in opposed relation the
ing having a ?uid inlet opening and a pair of
relative positions of adjacent ports; said pistons
?uid outlet openings, said housing being formed
being movable by a difference in the relative ve
with a pair of bores disposed in substantially
locities of the ?uid passing through their re
parallel spaced relation and in common com
spective passageways of relatively small diameter
munication with said inlet opening, each of said
whereby the volume of ?uid discharged from
bores having a ?uid outlet port affording com
each outlet opening will be in de?nite propor
munication with different outlet openings; a pair
tion with one another.
5. A ?uid metering device comprising a hous
of pistons slidably mounted in said bores and
each provided with a longitudinally extending
ing having a ?uid inlet opening and a pair of 70 passageway of relatively small diameter in com
?uid outlet openings, said housing being formed
mon communication at their outer ends with said
with a pair of relatively spaced bores in common
, ?uid inlet opening, each passageway at its inner
communication with said inlet opening, each of
end communicating with a laterally extending
said bores having a ?uid outlet port affording
port in operative alignment with the adjacent
communication with different outlet openings; a 75 outlet port thus affording communication with
2,291,229
5
other; said housing being provided with a com
municating passageway connecting the inner ends
of said bores for effectively cushioning the move
the respective ?uid outlet opening‘; a link mem
ber pivotally mounted in said housing and hav
ing laterally projecting ends operatively associ
ment of said pistons.
'
ated with said pistons for effecting unitary move
10. A ?uid metering device comprising a hous
ment of the latter in relatively opposite directions O!
ing having a ?uid inlet opening and a pair of
to vary in opposed relation the relative positions
?uid outlet openings, said housing being formed
of adjacent ports; said pistons being movable by
with a pair of bores disposed in substantially
a difference in the relative velocities of the ?uid
passing through their respective passageways
parallel spaced relation and in common communi
whereby the volume of ?uid discharge from each
cation with said inlet opening, each of said bores
outlet opening will be in de?nite proportion with
having a ?uid outlet port a?ording communica
tion with different outlet openings; a pair of pis
one another.
8. A ?uid metering device comprising a housing
tons slidably mounted in said bores and each pro
having a ?uid inlet opening and a pair of ?uid
vided with a longitudinally extending passageway
outlet openings, said housing being formed with
of relatively small diameter in common com
a pair of‘ bores disposed in substantially parallel
munication at their outer ends with said ?uid
spaced relation and in common communication
inlet opening, each passageway at its inner end
with said inlet opening, each of said bores having
communicating with a laterally extending port in
a ?uid outlet port affording communication with
operative alignment with the adjacent outlet port
different outlet openings; a pair of pistons slid- . thus a?ording communication with the respective
ably mounted in said bores and each provided
?uid outlet opening; a link member pivotally
with a longitudinally extending passageway of
mounted in said housing and having laterally
relatively small diameter in common communi
projecting ends operatively associated with said
cation at their outer ends with said ?uid inlet
pistons for effecting unitary movement of‘ the
opening, each passageway at its inner end com \ . latter in relatively opposite directions to vary in
municating with a laterally extending port in
opposed relation the relative positions of adja
operative alignment with the adjacent outlet
cent ports; and resilient means operatively asso
port thus affording communication with the
ciated with each piston for exerting a yieldable
respective ?uid outlet opening; a link member
pressure thereon and effecting an initial balanc
pivotally mounted in said housing and having
ing of said pistons; said pistons being movable
laterally projecting ends operatively associated
by a di?erence in the relative velocities of the
with said pistons for effecting unitary movement
fluid passing through their respective passage
of the latter in relatively opposite directions to
ways whereby the volume of ?uid discharged from
vary in opposed relation the relative positions of
each outlet opening will be in de?nite proportion
adjacent ports; and adjustable means operatively ; with one another.
connected to said link member for moving said
11. A ?uid metering device comprising a hous
pistons bodily to thereby initially vary the rela
ing having a ?uid inlet opening and a pair of
tive positions of the outlet ports; said pistons
being movable by a difference in the relative
velocities of the ?uid passing through their re
spective passageways whereby the volume of ?uid
discharged from each outlet opening will be in
de?nite proportion with one another.
9. A ?uid metering device comprising a housing
having a ?uid inlet opening and a pair of ?uid
‘ fluid outlet openings, said housing being formed
with a pair of bores disposed in substantially par
allel spaced relation and in common communi
outlet openings, said housing being formed with
a pair of bores disposed in substantially parallel
spaced relation and in common communication
with said inlet opening, each of said bores having
cation with said inlet opening, each of said bores
having a ?uid outlet port affording communica
tion with different outlet openings; a pair of
pistons slidably mounted in said bores and each
provided with a longitudinally extending passage
way of relatively small diameter in common com
munication at their outer ends with said ?uid
inlet opening, each passageway at its inner end
communicating with a laterally extending port in
a ?uid outlet port affording communication with ,
operative alignment with the adjacent outlet port
different outlet openings; a pair of pistons slid
thus a?ording communication with the respective
?uid outlet opening; a link member pivotally
mounted in said housing and having laterally pro
jecting ends operatively associated with said
pistons for effecting unitary movement of the
latter in relatively opposite directions to vary in
opposed relation the relative positions of adja
cent ports; and resilient means operatively asso
ciated with each piston for exerting a yieldable
ably mounted in said bores and each provided
with a longitudinally extending passageway of
relatively small diameter in common communi
cation at their outer ends with said fluid inlet
opening, each passageway at its inner end com
municating with a laterally extending port in
operative alignment with the adjacent outlet port
thus affording communication with the respective
?uid outlet opening; a link member pivotally 60 pressure thereon and effecting an initial balanc
mounted in said housing and having laterally pro
jecting ends operatively associated with said
pistons for effecting unitary movement of the
latter in relatively opposite directions to vary in
opposed relation the relative positions of adjacent
ports; said pistons being movable by a difference
in the relative velocities of the ?uid passing
through their respective passageways whereby the
volume of ?uid discharged from each outlet open
ing will be in de?nite proportion with one an 70
ing of said pistons; said pistons being movable by
a difference in the relative velocities of the ?uid
passing through their respective passageways
whereby the volume of ?uid discharged from each
outlet opening will be in de?nite proportion with
one another; said housing being provided with a
communicating passageway connecting the inner
ends of said bores for e?‘ectively cushioning the
movementof said pistons.
JAMES P. JOHNSON.
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