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Патент USA US2404512

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July 23, 1946.
H, (3, MAY ErAL
Filed April 29, 1944
Harry G May‘ '
Glenn TMcG’l‘upe
Q, 2 ‘
PatentedvJuly 23, 1946
I ..2;.404,512
' ‘Harry
East McKeesport,
Pa, assignors
‘and -1Glerm
to 'il‘he
=Westinghouse-Air 'Brake Company, :Wilmerding,
¢Pa‘.,' a corporation of Pennsylvania
Application fApl‘il‘ZQ, 194:4, Serial‘Nof533A27
6 Claims. (Cl.121--;4-1)>
One ‘object of 'the‘linvention is the ‘provision of
an improved control apparatus “of the "above type.
Another object "of the ; invention ‘is ‘the provi
‘sioniio'f "a control apparatus embodying a fluid
pressure control-led supply and release ‘valve
mechanism so constructed'and arranged that the
pressure of E?uid provid'ediby‘said mechanism has
A supply and ‘release valve zstlfll?tlll'?rl? is
provided for regulating :pressure- of :fluid impres
sure chamber 2 to control thet‘positioning 103:‘ the
power ~vpiston I‘ 'in- accordance :with :pressure of
operated ‘power means “for selectively positioning
a‘mul-ti-‘position device ‘to be operated,‘ such as
anieng'ine throttle, aclutchyetc;
said vchamber “is substantially atmospheric ~pres~
' vThis invention relates "to ‘control apparatus and
more iparticularly 9to the itype \rem'bodying Tluid '
controlling filui'd provided through acontrolpipe
lI-I to :act 2in‘a chaniiber t2 ion .21, 2pilot diaphragm
‘l3. - The control" pipe EH qnayhe connec‘tedl‘to any
suitable operatorisboritrol'wdearice Knot shown)
locatediat any Pfdes'i're‘d station and which is jop
erative to ‘provide any “selected pressure :of :?uid
in chain-her ' 42 ifrom atmospheric pressure -'to :a
no‘ effect upon ‘the operation of the ' apparatus ‘in
chosen rrnaximum degree in ‘excess of *ithatrof the
respon'sei'to‘the"controlling ?uid. ‘
Still another object "of the invention ‘is "the
provision for a "relatively simple control apparatus
arranged ‘for :control ‘pneumatically "from ‘any
"Theisupply and "release 1valve structure "t0 com
operate with promptness ‘to ‘position 'a'dev'i'ce‘be
prises "a bushing or- nsleeve ‘J15 pressed ‘into :a bore
in the casing in parallel relation to but spaced
vfrom the piston rod
One-end of this tbu-shing
of a'controlling "fluid, and regardless of the pres
to atmosphere ‘through a v"breather port H. The
suitable control *station ' and "which ’is adapted to
ing controlled "in " accordance with the “pressure 420
qpmposiitehendl-extends- outsidev of the casing “in-i-the
sure :of ‘fluid required to-‘position ‘said device.
same 1direct'ion-?as'fpiston rod
.‘Other "objects ‘and advantages will ‘ be apparent
In the accompanying drawing, the single :?g
ure'isi'a diagrammatic sectional view of a control
apparatus embodying the‘invention.
while within the l.
casing, the "bushing ‘sis eiic'ircledFby an annular
recess 18 fwhich-“openslto a cavity 1P9; Pressure
chamber -’2 "is ‘also ‘open ---to 19 through ‘a
fromithe "followingv’m'ore detailed description of
the ‘invention.
terminaitesin a cchaniberl?iwhich mayibeeopen
—A-p'1unger 12! i'containe’d »'mainly in chamber IIEB
‘has one "end mounted tois'lidei'ini-the adjacent end
portion‘ro‘f/ sleeve T l5 , ‘while ‘ancoppos'itely arranged ‘
plunger 22 also slidably mounted 1‘in said bush
As ‘shown in the drawing, the tim‘provedfcon
ing projectsetrom "the opposite end of bushing l1 5.
Within the v's‘leeve 1'5 fthesplunger2l has Van‘ Van
nular recess containing arsea'l ‘ring 23‘ having
trol apparatus ‘comprises ‘a *casing ‘containing ‘a
power piston ‘I ‘having ‘at ‘one "side ;a "pressure
chaniber '2 ' 'and‘havinga't the opposite ‘side ' a .non
sealing #contact “with said plunger iandithe ‘inner
wall ‘of ‘said sleeve to prevent '~'leaka‘ge ~o‘f ?uid
pressurechambert. "Theouterend, of the non
pressure chamber
closed .iby "an integrally
formed ‘head ‘4 having "a ‘central opening lined
with *a"bu'shing~5.' VA piston'rodilifhaving one’ end
under ‘pressure 1from ‘a chamber ’-24 ‘formed be
tween ‘the adjacent ends of‘the =two - plungers to
chamber 116.
similar 'seal ring '25 ‘is ‘provided
secured "tothecen'teriof piston l extends through
thenon-pressure cham'her '3_ 'andfbus'hing ‘5 "to the 40 in'theadjacent‘end o‘f‘ plunger 22 to prevent leak- '
age 70f Tluid‘under pressure ‘from chamber 1'24 past
exterior .of thecas’ing. "Outside o'fthe casing the
‘plunger. to atmosphere. Chamber 24 gislcon
rod‘6 is adapted to ‘be connected to a device (not
stantly ‘open through one" ,or more ports ‘26 in
shown) whichlit is .idesire'dr'to operate. .Su‘f?cient
bushing 4-5 to recess '18 and thus “to pressure
clearance may exist around the rod 6 ,in bushing
5 'to allow breathing of the non-pressure cham
ber 3 to. and from. atmosphere.
Theinon-pressure chamber 3 contains a coil
control spring "'I encircling the-piston rod '6 with
"I'he'plunger *2l ‘has a‘*bore;or chamber ‘21 ar
ranged to hecbnstantlygsupplied'with‘?uid ‘under
one end ‘supported on ‘the non-pressure "head '4,
pressure ‘from any (suitable vsource. One struc
ture ‘for thus conveying ?uid’to bore 21 consists,
This spring is under’ a sufficient degree of ‘pres
sure to urge the piston * l-itoithe ‘po‘s'ition‘r'in which
coaxial ‘but "reversed relation to and “spaced ~from
while ‘the opposite "end "bears against ‘piston *1. 50 as~shown‘in “the drawingyof‘a ?exible diaphragm
it isshown‘in‘th'e drawing, which/position ‘isde
28 ‘of the same “area as - diaphragm ‘ vl3-arranged in
the ‘ “diaphragm "l3, -=iboth vdiaphragms
clamped ito‘theca's-ing around ‘their ;outer pe
8 - in'lpressure ' chamber 52, ‘when the pressure Vin 55 ripheral edges :in xaiconventional-»-manner. ‘Be
termi-rred by contact of 2piston ‘rod 16 withia- stop
I 11,?
tween the two ‘diaphragms is formed a pressure
chamber 29 to which is connected a ?uid pres
sure. supply pipe 30a leading from the source of
?uid under pressure. Diaphragm 28 has at its
opposite side the chamber H2‘.
The plunger 2| has a followerjplate 30 in
lower 54 and the release valve stem 46 so as to be
constantly eifective to urge the plunger 22 in a
direction out of seating-contact with the release
valve 45. The spring 53 is weaker than spring
42 for reasons which will be later brought out.
A spring seat 55 is secured to plunger 22 outside
chamber l Hi‘ engaging ,the adjacent face-ofzdi
aphragm 28, andiextending from this follower
and is engaged by one-end of a coil spring 51
ofithecasing' by any suitablesecuring'means 56
plate through the two diaphragms and a follower
plate 3| engaging and connecting the adjacent
encircling the portion of sleeve l5 projecting from
the casing, and the opposite end of said spring
faces of the two diaphragms is a projection, 32. ,
of plunger 2| . This projection extends into
is supported on the portion of the casing en
circling said sleeve. The spring 5’! exerts a rela
chamber |2 slightly ‘beyond the outer face of’ di
' tively small degree of force on plunger 22 urging
aphragm i3, and within this chamberfa follower
plate engages the'adjacent face of diaphragm I3.‘
same in a direction toward the right hand. An
‘adjusting screw 58>is'mounted in the outermost
endof plunger 22 and is secured in' an adjusted
cThe' projection 32 is‘ providedwith a screw
threaded bore 34,-and a nut 35 having screw
position by a lock nut 59.
The casing is provided with a projecting bracket
plate 33 is mounted on this projection which
threaded engagement within this bore is ‘provided
B0 in the outer end of which is a fulcrum pin 6|.
with a ?ange 36 which engages the plate 33. 20 A follower-up member 62 mounted to rock on
Tightening‘of' nut 35 clamps ‘the ‘central portion
of diaphragm ‘l3 between the follower plates
this-pin has an operating-arm 63 ‘in the end of
which isa slot through which extends a ping-:64
secured to thepower piston rod 5, whereby said
arm‘ will be moved with saidpiston._ The follow
33 and‘3l and at the same time clamps, the cenee
tral portion of diaphragmr-28'between plates 3|‘
and 38,'as will be apparent.
25 up member 62 also comprises a cam 65,-’ theper
It willbeseenthat' the effect of pressure of
?uid from the source in chamber 29.011 diaphragm‘
ipherial surface of which is aligned with the axis
of the adjusting screw 58. lAnarm, B6 fulcrumed
‘ I l3 will be offset by its. effect on diaphragm 28
' at one end on a- pin ?‘l'secured inbracket 60 has
‘and will therefore. not'in?uence in» any way pres
' sure of. controlling-?uidin chamber I2.
at its opposite end a vcylindrical like enlargement
The screw-threaded ‘bore 34 inthe projection
32 v'ofaplunger 2|~_is;: open to bore .21 and'also
through one 'or more, ports 38 in said projection
and :ports'i39iin‘vfollowerl plate 3| to chamber 29,‘
whereby bore 21 will be constantly supplied with 1
?uid under-“pressure from the supply pipe‘ 30aj
when said ‘pipe is‘ supplied with ?uid under pres
68 interposed betweenhand engaging on one side
the’ adjusting screw 58 while itsoppositeside
engages the peripherial surface of cam 65. -The
surface of cam 65 is so formed as to permit move;
ment of plunger 22 in the direction of said cam
upon rocking of the follower~up member 62; in a
counterclockwise direction, and to-displace said
vplunger into sleeve |5 upon rocking ofthe follow
up member in the opposite direction.‘
V The bore 21 contains a ?uid pressure supply
In chamber I6 is a control spring 10 encircling
'valve lid-having a‘ ?uted stem 4| having sliding 40 the plunger 2|. One end of this spring is sup
contactwith-the side wall .of a bore which is of
ported on the portion of the casing encircling the
smaller diameter thanvthat of bore 21 andwhich,‘
end of bushing |5 which extends into said cham
at the'end of plunger 2|, opens into chamber 24.
ber, while the opposite end of said spring bears
Atthe junction of-these two bores is a seat forv
against a follower 1| slidably mounted on said
the supply valv'e'4D; One end of a coil spring 42
plunger and ' arranged to contact the follower
contained in'chamber 21 zbears‘against the supply v
Valve 40 while the opposite end is supported on‘
The spring ‘H1 is arranged to ‘urge the ‘dia
plate 30.‘
a perforated seat 43projectinginto said bore-from .
phragms I3, 28 ‘and plunger 2| in the direction .of
the nut-35., This spring is under pressure and
the left hand only to the positions shown in the
therefore constantly eifectivewto urge the supply 50 drawing and to oppose with increasing force’
3 ' valve toward "its ,seat.
In chamber 24,~the;end of the supply valve stem
4| engages a ?uid pressure release valve 45 con,
tained, in-said'chamber and having a ?uted stem
“which, is disposed to'slide in an axial bore pro
vided in the plunger 22, saidstem‘ “extending j
; through said bore. and into a bore 41 of larger
diameter.-¥The plunger 22 is provided on its end
movement vof these parts from said positions in
the direction of the right hand. The diaphragms
I3, 28, and plunger 2| are. also movable from “the
positions shown in the drawingtoward the left
hand relative to the control spring 15 and plunger
22 to positions de?ned by contact of nut '35 with
a stop shoulder 12. The action of springr53ron
3 tween said chamber and bore 41 whichlbore is in ~
the ‘release valve stem 46, transmittedthrough
the two valves 45 and40 and the stronger spring
42 to nut 35 is adapted to e?ect movement of the
parts to this latter position’d’e?ned by Contact
‘ constant communication with they atmosphere ,
, between nut 35 andstop 12, and it "willb'e noted
through one or more ports 48,’ an annularrrecess
‘ 49 in the outer peripheraljsurface of plunger 2|"
that such movement will unseat the release valve
45 from the end ofplunger 22 while the supply
in chamber 24 with a seat for cooperation with 1
the vrelease valve to control communicationbe to
‘ and one or more ports 50 in sleeve'l5.
vIn'bore;4'| the release valve stem ‘46 engages
one side ofaspring seat 5| which is‘loosely ‘
; ‘mounted in said bore'and which maybe provided
with one or more notches 52 around its peripherial
edge to allow ?ow of ?uid under pressure from
one side tothe opposite side. ,The opposite side
of springseat 5| is engaged by one end of a coil ‘
1 spring 53, theopposite end of which is supported
3 by a follower 54 secured ‘in plunger 22. The
spring 53 is con?ned underpressure between £01:
' valve 40 will remain, seated under pressure of the
stronger spring 42.
The nut 35 has an extension the end of ‘which
constitutes a plunger 73 which is disposed to slide
in a bushing '14 in the casing. The plunger, '53 has
an annular recess in which is disposed a sealring
15 having sealing contact with the plunger and
bushing to prevent leakage of ?uid under pressure
between chamber I2 and a pressure chamber 76'
provided at the outer end of the plunger. Cham
ber 16 is open through a passage 11 to cavityi I79
her 2, might .accomplishisuch ‘movement and/the
effect of such low-pressure actingin chamber =24
‘on, plunger-2| against’ the pressure of; controlling
to-move'plunger 22‘ inthe direction of‘the relea
valvei‘45 which‘iat this time will be held-stationary’
with plunger 2|. *This plunger 22 will thus; con
tinue to move until itcontacts'the release valve
45 whereupon‘ further release of ?uid under- press
sure, from the-‘power piston-chamber '2 '-will 1be
ipreventedzand said piston will stop in a position‘,
it will be vnoted, corresponding to that of plunger
‘2| 'andlin turn'to the?‘ reduced pressure. of. ?uid
in'chamber |2.<'
?uid in chamber l2 on diaphragm _|;3. might ‘not .
cause any material change in the adjustment of
plunger 2| and hence in the'accuracy of adjust
ment of piston | in accordancewith'the pressure
of‘ ?uid provided inchamber I2. i However,="ifr a
much greater. force were ' required ‘to v‘move-the
deviceto the certainlposition above mentioned‘,
~ ‘Upon a further reduction in pressure in ch-am;
the correspondingly'greater pressure :of ?uid 'ree .
ber ,IZthe 'plunger'll will ‘assume a new position
quired‘on piston-‘I :mightnot be obtained‘with
the chosen controlling pressure inllchamber I2’,
corresponding to such pressure,’ and'the opening
and then closing of the_release valve 45 will cause
the power piston l to move to’ a new-and corre
' ~
since the increased pressure in'ch‘amber' 24 might
15 be su?icient to move'plunger 2| 'againstfthe oppos
ing pressure of ?uid in chamber |21and permit
' - Upon'a'complete release of ?uid underpressure
closing of the supply- valve ‘40 before obtaining -
from chamber l2, the spring 10 will return the
said greater pressure; To obtain'the'greater'prese
diaphragms and, plunger 2| to the positions shown , sure the operator wouldthen have to increase
in'fthe drawing and the action'of spring53 on 20 the pressure in chamber: | 2 to. compensate for
the release valve stemgd? will then continue move
ment'of vsaid diaphragmsandof plunger 2| to
said greaterpressure and thus above the degree
normally required toobtain the desired position
theposition de?ned ,by- contact between the nut
ing of the device. The structure shown in the ~
drawing and above described avoids such di?icul
pressure from piston chamber 2 will then. occur 25 ties however and‘ ensures thatlthe piston: liwill
and the piston, |will be returnedtoward its nor
assume a position"corresponding?to the pressure ’
mal position actuating the follow-up member N62
of ?uid provided‘ in chamber | 2, regardless for the
35'and stop 12. I A furtherreleaseofj?uidunder
,to move plunger 22 in the direction of plunger ‘2|
as " above described;
pressure of ?uid-required‘in chamber. 2’ to move 7
However.’ with the plunger
thepiston | to the chosen'positioni': ;
' w
. .
2| in the position de?ned by. contact‘ between nut 30
Having now described, our invention, Whatiéwe
35 and. stop 12, the end of theipiston'rod'? ,will
claim as new and desire’ tofsecuresby Letters
engage stop 8 with plunger 22;stillout of engage
Patent, is:
~ ‘
ment with the release valve 45, so'that a com
pleterelease of v?uid under pressure from piston
chamber 2 will occur. 7'
1. Af?uid pressure control device comprising
' spring means, movable controlmeans subjectlto
35 pressure of said spring'means and ‘to opposing
It will now be seen that by decreasing -' the
pressure of ?uidin a chamber, means providing
forvarying the pressure of ?uid'in said chamber,
pressureof ?uid in'chamber l2, the structure
will operate to cause the piston | and devicebe
ing operated to assume a position corresponding
to such decrease,‘ or a plurality of different se
lected positions successively upon a series of chos
a plunger connected with and‘ movable by said
control means and having a supply chamber sup-1
40 plied withu?uid under pressure, a su-pplyyalve
carried by: said plunger and operable to supply
V . en reductions in the pressure of ?uid in chamber
l2. Moreover it will also be seen from the above "
description that the operator by providing suit
e?ect closure of said‘ valve, and means'subject
able pressures of-?uidin chamber |2 may cause
the power piston .|_ to move ?rst in one, direction
and then in the opposite direction to obtain any
chosen adjustment, or series of di?erent» adjust
ments, or change in adjustment of the device be
_It will be noted that whatever pressure of ?uid
is effective in chamber 2 on the power piston‘ I
is likewise eifective in chamber 24 in plunger'Z I.
This pressure of ?uid on plunger 2| opposes-pres
sure of ?uid in chamber l3 on diaphragm ~|2
?uid under pressure from said supply chamber
to a control cha‘inbenseatin'g means operable to
to pressure of v?uid in said control ‘chamber. oper
able upon movementfof said plunger by‘an in-'
crease/in- pressure of ?uid’ in the ~?rst= named
chamber» to open? said supply valve and operable
by pressure of ?uid provided’ in said ‘control
chamber to render said seating means operable
to effect closure of said supply valve.’
2. A ?uid pressure control ‘devicecomprising
spring means, movable-control means subject to
pressure "of said spring means and to opposing
pressure-of ?uid in'a, chamber, mea'nsproviding
and thus tends to change the positionof plunger
2| as chosen by the pressure of‘ ?uid provided in
said chamber by the operator. [This tendency.
a plunger,‘ connected with and movable by said 7
is howeverrcounteracted at all times by-subject
plied with ?uid under‘ pressure, a supply valve '
ing plunger 13 in chamber 16 to thesame pressure
of ?uidas acting in chamber 24 on plunger 2|
so that regardless of the pressure of ?uid provided I,
to'ac'tuate the power piston I the position of
plunger 2| will always correspond to the pressure
of?uid provided in chamber |2,>and'in turn,
the position oflthepower piston- I, will likewise
correspond to suchpressure of ?uid. 7
This structure andffunction just described: is .
V of particular. importance where‘a device being
operated requires di?erent degrees of actuating
force in different positions of the device, and hence
in different positions of the power piston. For
instance, if only a relatively small actuating force
were required to move- the device to a certain
position a relatively low pressure of ?uid in chain-g
for varying the ‘pressureof ?uid’in said chamber,‘
control means and having a supply chamber sup-.
carried by'said plunger and operable. to supply
?uidunder pressure from said supply chamber
to a control vchamber, seating means operableito'
effect closure of said valve; said plunger project
ing from one side of said control means and being
subject to pressure of_ ?uid ‘in said control cham-‘-'
her, a second plunger projecting'from the oppo-"
site side of and connected'with ‘and movable by '
said control means and; subject to‘ pressurei'o?
?uid in said control‘chamber counteracting‘presi
sure of ?uid in said control chamber acting ‘on’
the ?rst named plunger, and'means subject :to'
pressure of ?uid-inv said control chamber'operable"
upon movement of said, plunger by an increase’
in pressure of ?uid in the ?rst-named chamber
to open saidtsupplyuvalvdand operable by pres-I
sure of ?uid: provided‘- inzsaid' control‘: chamber
to render saidi seating 1 means operable-1 to
effect _
7 .
closure vot'saidi supply valve;
said? one plunger, said-diaphragm means‘being
subject to} opposing ‘pressures: off atmosphere and’
of ?uid-ina control chamber, a regulating spring.
3: 'Ax?uid pressure‘ control?» device“ comprising
spring‘ means, >movabl'e‘ control? means’ subject to
and: adjustable‘: in. accordance‘ with the, differen
als’oua‘cting on1 said 'di'aphragm‘mea'ns in opposi
tial? between. pressure of "?ui'di in a‘- - chamber and:
thetoppositeldirection to a'positioni corresponding
opposing-atmospheric pressurevv plus pressure of:
tion .to, pressure of‘?’uid‘ in‘, said? controli chamber,
said: diaphra'gn'iv means‘ being‘ operable! to move
said? ?rst plunger? in either, one direction»- or" in
to the=pressureoi ?uid in- said control‘ chamber,
said spring means, means» providing for‘ varia
tions in.; pressure of“ fluid? in said chamber, a 10 and-‘means connected to- said control ch'amben
providing for.“ varying‘ the pressure ‘of-I- ?uid‘
plunger: movable‘ by said movable control means
and: having a ?ui‘di pressure- supply‘ chamber,
m‘ean's‘ arranged’ to supply‘?'uid? under‘ pressure
- 5*. A: ?uidi pressure» control device comprising a
trol‘ means upon an increase in pressure off ?uid
ance with-the degree of such pressure, the other
casing having! two spaced apart‘, parallel arranged»
to1 said supply chamber, a supply valve control
ling? a ?uid pressure supply communication be 15' bores-a1 power piston disposed in one oflsaid;
bores and‘v subject, on- one face to pressure of
tween said‘ supply chamber andia control cham
?uid‘: in a- power chamber, a- spring in said=v casing
ber, seating means operable to actuate said valve
acting on‘ said“ piston‘ in opposition to pressure
to ' close said- communication, v andI means subject
of‘ ?uid'in- said' chamber ‘and ‘cooperative with,
to3 pressure oil ?uid in: said?- control‘ chamber oper- "
ableu-pon‘ movement of said plunger by said con 20 said? pressure~to> position‘ said-piston in accord-‘r
inthe ?rst named chamberl‘to' actuate saitlsupply
valve- to: open said communication and operable
byv pressure ofv ?'uid provided2 in: said- control
chamber to render' said seating means operable 25
bore: being open. at opposite ends to atmosphere,
two relatively movable plungers slidabl'y mounted
in. said other bore and cooperating to= form'a
second chamberv between their adjacent ends,
conduit meansrconnectin‘g said power chamber‘
to actuate said supplyvalvevtoi close- said com
andvv said second chamber, one'of saidplungers
a supply-chamber supplied'fwith ?uid
- di'A- ?uid pressure control device" comprising
under pressure; a supply valve disposedwin's'aid
a casing having two spaced apart, parallel‘ ar
ranged bores, a- po'wenpiston disposed in'one of 30 supply chamber andarrangedv to control ?ow of“
?uid under. pressure from said; supply chamber
said bores and/subject‘ on onefaceto ‘pressure of’
to-sai'd second chamber'and power chamber, a‘
?uid in a ‘power chamber, a spring in said casing
release valve in said second chamber cooperative
acting on said piston in opposition to pressure
with said second- ‘plungerv to'iicont'rol‘ a ‘release '
of ?uid in said chamber and cooperative with
communication for: releasing ?uid underipressure‘ “
said pressure‘ to- position? said piston in accord
from saidiisec'o'nd? chamber‘ and‘power vchamber;
ance w-itl'1*~ the degree of such pressure, the other
said one plunger being operable upon movement
bore being open at opposite ends to atmosphere,
relative to and in the direction of said second.
two relatively movable plungers slidably mounted
plunger to effect closure of said release valve
in said other bore and cooperating to form a
and opening of said supply valve and being oper
second chamber between their adjacent ends,
conduit means connecting said power chamber
and said second chamber, one of said plungers
having a supply chamber supplied with ?uid
under pressure, a supply valve disposed in said
supply chamber and arranged >.to control ?ow
of ?uid under pressure from said supply chamber
able upon movement in the opposite direction
relative to said second plunger to effect open
ing of said release valve, and said second plunger
being operable upon movement relative to said
one plunger in a direction away fromsaid one
plunger to effect closure of said supply valve and
in the opposite-direction to eifect closure of said
to said second chamber ‘and power chamber, a
release valve, lever means connecting said piston
release valve in said second chamber cooperative
to said second plunger ‘and having a fulcrum
with said second plunger to control a release
communication for releasing ?uid under pressure 50 connection with said casing and operable upon
movement of said' power piston in response to
from said second chamber and power chamber,
an increase in pressure of ?uid‘in said power
said one plunger being operable upon movement
chamber to render said second plunger movable
relative to, and‘in the direction of-said second
inra direction away from said ?rst plunger and plunger to'e?ect closure of said release valve and
in response to a reduction in pressure of ?uid in '
opening of said supply valve and beingoperable
said power chamber to move said second plunger '
upon movement in the opposite direction relative
in the direction of said ?rst plunger, movable.
to said second plunger to effect opening of said
diaphragm means disposed in said casing in co
release valve, and said second plunger being oper
relation lwith and connected to the other
able upon movement relative to said one plunger
in a direction away from said one plunger to 60 end of said one plunger, said diaphragm means
being subject to opposing pressures of‘ atmos
effect closure of said supply valve and in the op
and of ?uid in a control chamber, a reg¢
posite direction to effect closure of said release
ulating spring also acting on said- diaphragm‘
valve, lever means connecting said piston to said
means in opposition to pressure of ?uid in said.
secondplunger and having a fulcrum connection
control chamber, said diaphragm means being‘
with said casing and operable upon movement
operable to move said ?rst plunger in either one
of said power piston in response to an increase
in pressure of ?uid in said power chamber to
render said second plunger movable in a direc-'
tion away from said ?rst plunger and in response ,70
to a reduction in pressure of ?uid in said power
chamber to move said second plunger’ in the
direction of said‘ first plunger, movable dia-Y
phragm means disposed in said casing in coaxial
direction or ‘in the opposite direction to a posi
tion corresponding to the pressure of ?uid in said
control chamber, and means connected'to said
control chamber providing for varying the pres_
sure of ?uid therein, said diaphragm means com
prising two spaced apart‘?exible diaphragms co
operating to form a chamber between them,
conduit means connecting the last named cham- '
relation'with and connected to the other end of 75 her to said supply chamber, and. a ?uid pressure
supply pipe connected to"the chamber between V
from said’one plunger to I e?ect closure of said
the two diaphragms for supplying. ?uidrunder
supplyvalve and in the'opposite direction to
pressure thereto and to said supply chamber. . ,i
' e?‘ect closure of said release valve, lever means
6._A_?uid pressure controldevice, comprising
a casing having two spaced apart, parallel ar
ranged bores, a power piston disposed intone of
said bores and subjecton oneface to pressure
of ?uid in a power chamber, a spring in said
casing acting on said piston in opposition to
pressure of ?uid in said chamber and cooperative
with said pressure to, position said piston insac-l
cordance with the degree of such pressure, the
otherbore being open at opposite ends to atmos
phere,_two relativelymovable plungersslidably .
connecting said piston to said second plunger and
having a fulcrum connection with said casing and
operable upon movement of said powerjpiston in
response to an increase in pressure of ?uid in
said power chamber to render said second
plunger movable in a direction away from said
0 ?rst plunger and in response to a reduction in
pressure of fluid in said power chamber to move
said second plungerv in the direction of said ?rst
plunger, movable diaphragm means disposed in
said casing in coaxialrelation with and‘con
mounted in said other bore-and cooperatingto' - 7 nected to the other end of said one plunger, said
form_ a second chamberbetween their, adjacent‘
ends,,_conduit means connecting said power'
chamber and saidrsecond chamber,_ oneof said
plungers'vhaving a supply ‘chamber supplied withv
?uid under pressure, a supply valve disposed-Yin:
saidsupply chamber and arranged to control ?ow
o1’ ?uid under pressure from said. supply cham
ber to said secondchamber, and power cham
berbagrelease valve in said second chamber co.»
operative with said second plunger; to 7 control .
a_releasecommunication for releasing ?uidunderl
pressure ‘from said second chamber and power;
chamber, said one», plunger beingoperable .;upon 1
diaphragm means being subject to opposing pres-,
sures of atmosphere and of ?uid in a control
chamber, a regulating spring also acting on said
diaphragm means in opposition to pressure of
?uid in said control chamber, said diaphragm
means being operable to move said ?rst plunger
in either one direction or in the opposite direc
tion to a position corresponding to the pressure
of ?uid in said control chamber, another plunger
slidably mounted in said casing in coaxia1,re1a-.
tion and connected to said one plunger and sub-V
ject to‘ pressure of ?uid in a chamber WhiCh'OD;
poses pressure of ?uid in said second chamber
movement relative to, and in the direction of; acting on said one plunger, conduitv means es
saidv second plunger, to effect closure of said re: 30 tablishing a ?uid ?ow communication between
lease valve and, opening of saidv supply valve; ' the two last named chambers, and“ means con
and heingreperable upon; movement in the op.—'
posite; direction relative to ,said ..:second _ plunger, '
tqe?eqt vopeniris. ofsaid release valve, and said‘
1 seqond rlungenbeine operable upon . movement l 35
relative to said oneplungenin a direction away :
nected to said control chamber providing 'for
varying the pressure of ?uid therein.
‘ , ,QHARRY 0. MAY,
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