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Патент USA US2411748

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NOV. 26, 1946.
'
C, 5_ KELLEY
-
CONTROL
l
2,411,748
DEVICE
Filed May 20, 1944
57
IN VENTOR
’ BY
@im
' ATTORNEY
Patented Nov. `26, 1946
21,411,748
' UNITED STATES PATENT N
2,411,748
CONTROL DEVICE
rCecil S. Kelley, Forest Hills, Pa., -asslgnor to The
Westinghouse Air Brake Company, Wilmerdlng,
Pa., a corporation` of Pennsylvania
'
Application May 20, 1944, Serial No. 536,487
e claims. (ci. A12x-_41)
A
1
'
4
2
v
This invention relates vto control devices and
more particularly to the fluid pressure controlled
clamped 'between the casln'g section 8 and cover .9.
All of these diaphragms are arranged in coaxial
' relation with each other‘and with the power pis
One object of the invention is to provide an im
' ton I0. The flexing portions of diaphragms Il.
proved fluid pressure controlled and actuated de 5 I 2 and I3 are of the same areas. The flexing por
vice for adjusting any desired means such as an
tions of diaphragms I4 and I3 are each of a lesser
and operated type.
L
'
engine governor to control the speed or powe
output of the engine.
’
’ area and their areas are equal to each other.
A more speciiic` object of the invention is the
Between the power piston I0 and non-pressure
head 4 is a non-pressure chamber 20 which is open
provlsion of such a device embodying a fluid pres
sure controlled power piston and valve means ar
ranged for control by fluid under pressure for
controlling the pressure of fluid on the power
tween said piston and pressure head 5 is a power
pressure chamber 22 which is open to a fluid pres
sure control passage 23. A rod 24 extending
piston.
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r
Still another object of the invention is the pro
vision of a device of the above general type em
bodying a power piston and a multiplicity of ilex
ible diaphragms all of which are arranged in co
axial relation providing aV relatively small com
to atmosphere through a passage 2l, while be
through piston I0 and secured thereto passes
through pressure chamber 22 and a suitable bore
in thel pressurehead 6 to beyond theouter sur
face thereof. The pressure head 5 is provided with
two recesses spaced from each other and encircl
ing the piston rod 24, and in each of these recesses
pact and efllcient structure.
20 there is disposed a sealing ring 25 providing a
Other objects and advantages will be apparent
sea1 between the pressure head and said rod to
from the following more detailed description Yof
prevent leakage of fluid under pressure Vfrom
the invention.
” n
chamber 22 along said rod to atmosphere. A lu
In the accompanying drawing; Fig, 1 is a longi
bricating fitting 23 is secured to the pressure head
tudinal view, mainly in section, of the improved
3v and is open to a lubricating recess 21 provided
device; Figs. 2 to 5 are sectional views taken on
in said head around the piston rod whereby the
portion of said rod which slides through said head
lines 2-2, 3-3, 4-4 and 5_5', respectively, in
Fig. 1, Figs. 2 and 3 being shown on an enlarged
- may be lubricated as required.
v. The piston rod 24 projects slightly beyond the
scale; and Fig, 6 is a line diagram of a portion
of the structure shown in Figs. 1, 4 and 5.
30 rear face of piston I0 into non-pressure chamber
_
Description
20. wherein it is provided with a spherical like end
3| which fits in a recess provided at the center of
one side of a spring seat or follower 28. A like
As shown in the drawing, the improved device
comprises a power cylinder I having mounting
follower 29 is oppositely arranged adjacent the
feet or lugs 2.` One end of the cylinder I is closed 35 non-pressure head 4 and extending between and
by an integrally formed non-pressure head 4,
having contact at its opposite ends with these two
'_ while the opposite end is’closed by a removable
followers is a coil control spring 30. This spring
pressure head 5. A pile or stack of substantially
is confined between the two followers under pres
ring like casing sectionslö, 1 and 8 are secured to
sure for urging said piston in the direction of the
each other and to the non-pressure head 4 in co 40 left hand upon release of fluid under pressure
axial relation to cylinder I. The casing section 3
from chamber 22 and for opposingumovement of
at one end of the pile is mounted against the end
said piston in the opposite direction >upon supply
of the cylinder, while secured to casing section 8,
of fluid under pressure to chamber 22. The ex
disposed at the opposite end of the pile, is a
treme left hand position of piston I0 is determined
cover 9.
v
, by contact of said piston with a stop 32 provided
A power piston I0 is slidably mounted in the cyl'
on the pressure head 5.
inder I. Cla'mped~ around its peripheral edge be
Between non-pressure head 4 and diaphragm
tween the end of cylinder I and one side of casing
II is a chamber 35 which is openthrough a pas
section 8 is a iiexible diaphragm II. Two op
sage 33 `to non-pressure chamber 20. Between
positely arranged flexible` diaphragms I2 and I3 50 the two diaphragms II and I2 is a chamber 31
‘are clamped, around their edges, between, respec
to which is connected passage 23 leading from
tively, the adjacent faces of casing sections 6 and
the pressure chamber 22.- A diaphragm follower
1, and 'I and 8. In the opposite face of casing sec
38 disposed in chamber 35 in coaxial relation
tion 3 is a recess in which are disposed the peri
with diaphragm II has one side in contact with
pherlal edges of two ñexible diaphragms I4 and I5
the adjacent surface of said diaphragm and is
and a spacer ring I8 separating said diaphragme
provided on its opposite `side with a plurality
from each other. The cover 9 has a ring »like ex
of raised stops 39 for contact with the adjacent
tension Il projecting into the recess and engaging
side of the non-pressure head 4.` The non-pres
the edge portion of the adjacent diaphragm I5,
sure head 4 is provided centrally- with 'a' bore
whereby the diaphragms I4 and I5> are securely 60 which is lined with" a bushing 40 and slidably
3.
8,411,748
4 .
mounted in this bushing are 'three sectors of a ' ' and the adjacent spring follower 29 are al1 mov
-
ring like projection 4I of the follower 38. said
able as a unit.
v Chamber 5| between diaphragms 'IÍ and I3
is connected to a pipe 65 adapted to be supplied-
sectors being equally spaced from each other. A »
strut member 42 mounted in the projection 4I
is provided with a stop flange 43 which is sup
ported by the end of said projection. Projecting
with fluid under pressure from any suitable
source. Chamber 60 between the diaphragms I3
from the opposite side of member 42 is a cylin
drical like 4head 44 disposed in the recess in.
ment modifying pipe or what may be called a
and I4 is adapted to be connectedto an' adjust
follower 28 for supporting said follower. It will
Vernier control pipe 66. Between diaphragms I4
movement of the member in one direction.
threads to the cover-9. Encircling the projection
be noted that follower 38 and member 42 are 10 and I5 is a _chamber 81 which is in constant com
munication with chamber 5I in a manner which
capable of movement in either direction in bush
' will be later described.
ing 40. The bushingv 48 is kprovided in the non
The follower plate 58 has an axial projection
pressure chamber 28 with an outturned collar 45
69 extending through control chamber 56 and
which is disposed in contact with the inner' sur
face of the non-pressure head. This collaris 15 with its end disposed toslide in a guide bore in a
cap 10 removably secured by cooperating screw
arranged for contact with member 42 to limit
69 is a coil balance spring 1I, one end of which
The diaphragm follower 38 has a hollow pro
bears against the plate 58. The opposite end of
jection 48 extending centrally therefrom through
an axial opening in diaphragm Il into chamber
31, and disposed in this chamber and mounted
over said projection against the adjacent face
of diaphragm I I is a follower plate 49.
v A combined spacer and follower 50 is disposed
in a chamber 5I formed between the two dia
spring 1I is supported on one or more shims 12
carried in the cap 10.
Within sleeve 59 is a chamber 15 which is open
I through one or more radial bores 16 in said
sleeve and aligned radial bores 11 in spacer means
25 84 to chamber 61. The boss 6I has an axial bore
18 open at one end to chamber115, while its op
posite end is open through a seat, provided for
engagement by a supply' valve 19, to a chamber
phragms. »The follower 50 has a sleeve like mem
80 provided in member 52. At the end adjacent
ber 52 projecting centrally from one side through
anv axial opening in diaphragm I2 into chamber 30 the supply valve 19, the bore 18 is open through
one or more radial bores 8| to the fluid pressure
31, and slidably mounted on this member in said
phragms I2 and I3 and has its opposite faces in
contact with the adjacent faces of said dia
chamber is a sleeve 53 one end of which contacts
supply chamber 5I.
`
The supply valve 19 is provided on one end of
the follower plate 49 which is in contact with
a stem 82 extending through bore 18 into cham
diaphragm II. At the opposite end of sleeve 53
ber 15 and said stem is provided with a plurality
is a follower plate 54 which contacts the adjacent
of longitudinally extending spaced ribs 83 having
face of diaphragm I2. 'I‘he projection 48 of fol
sliding contact with the wall of _said bore, said
lower 38 is provided with external screw-threads,
ribs terminating short of said valve a distance
while the sleeve 52 encircling said projection has
equal at least to the width of the radial port 8l.
internal screw-threads cooperating with those
on said projection. Turning of the follower 50 40 In chamber 15 the valve stem 82 is provided with
an enlarged head 84 which is engaged by one end
and sleeve 52 relative to and onto the projection
of a coil spring 85. The opposite end of this
48 of follower 38 will therefore clamp the central
spring seats on the end wall of said chamber,
portions of the two diaphragms II and I2 be
which spring is constantly effective to urge the
tween their respective followers and secure such
supply valve 19 toward its seat with a relatively
parts together for movement in unison.
light degree of force.
Between the cover 9 and diaphragm I5 is a
The projection 48 of follower 38 is provided
pressure chamber 56 which is open to a control ‘
with an axial bore open at one end to chamber
pipe 51, and which contains' a follower plate 58
80, and slidably mounted in this bore and extend
engaging the adjacent side of said diaphragm.
This plate constitutes a ñange provided at one 50 ing into said chamber is a plunger 81. The
tral openings provided in the diaphragms I5 and
plunger has a stem 88 extending through a bore
provided in follower 38 into the space within the
I4, and in ring like spacer means 64 interposed
between and engaging adjacent faces of said dia
projection 4I, is supported on a member 89 hav
end of a sleeve 59 which extends through cen
phragms, said sleeve extending into a chamber
50 formed between the two diaphragms I3 and
I4. The follower 50 arranged between dia
phragms I2 and I3 has a hollow boss 6I extend
projection 4I.. .The end of stem 88, within the
ing radiating fingers 90 extending through the
spaces between the sectors of projection 4I and
supported on a suitable annular shelf 9| provided
on the non-pressure head 4.
~
The stem 88 is provided with an axial bore 92
ing through a central opening in diaphragm I3
into chamber 60 wherein said boss is provided 60 open at the end adjacent support member 89 to
a plurality of radial bores 93 leading to the space
with external screw-threads cooperating with in
within the projection 4I which space is open to
ternal screw-threads provided in sleeve 59. Slid
atmosphere through the space between the sec
ably mounted on sleeve 59 within chamber 60 is
tors of said projection and thence by way of non
contacting diaphragm I3 and having at the 0D 65 pressure chamber 20 and passage 2|. The oppo
site end of bore 92 is opened to the interior of .
posite end a follower- plate 63 contacting dia
the plunger 81 through a valve seat‘provided for
phragm I4. By tightening sleeve 59 on boss 6|,
engagement by a fluid pressure release valve 94.
the central portion of diaphragm I3 will be
a member having at one end a follower plate 62
clamped between followersv50 and 62, and the
The release valve 94 is provided on one end of
central portions of diaphragms I4 and I5 will 70 a pin 95 which is mounted to slide in a bore pro
vided through a suitable guide 96 disposed in the
be respectively clamped between follower 63 and
plunger 81. This guide is provided with three
spacer means 65, and said spacer means and plate
spaced guide ribs 91 (Fig. 2) which engage the
58. With the parts assembled in the manner'so
wall of the plunger, and between these guides
far described-it will be noted that the central
portions of all of the diaphragms, the stop 42 75 are spaces 98 for allowing flow of ñuid under
5
2,411,748
pressure from chamber 80 at one end of the guides
decrease said distance >and lever arm. The ad
Justments of the pivot pin IIE Ado not change
to an -annular recess 99v at the opposite end, the
release valve 94'being contained in said recess.
The release valve pin 95 extends into chamber`
80 and therein is provided with a head |00, and
between this head and the adjacent end of
the connections between said pin and the lever
5
_ |09 or member ||3, but only the connection be
tween the piston rod 24 and the pin II5. These>
facts are believed to be clearlybrought out in
the line diagram in Fig. 6 wherein the pivot pin
is indicated by the portion IIB thereof and to
plunger 81 is interposed a coil spring I0| which
constantly tends to urge the release valve 94
away from its- seat. The supply valve 19 is pro
the center of this portion are connected lines
vided with a stem |02 loosely- extending through 10 indicating the lever |09 and member I|3. The
the seat for said valve and engaging the head
eccentric II8 is shown in the neutral position
|00 which is at all times maintained in contact
occupied with the adjustment of disc |20 as in
with said stem by spring IOI, whereby the supply
Fig. 1 and above described, and connected to the
valve 19 and release valve 94 will move in unison.
center of the eccentric is a line indicating the
Projecting from' pressure head 5 is a bracket
v piston rod 24. The purpose of this structure
|05 and connected to said bracket by a pin |06
Including the eccentric II8 will be hereinafter
is one end of a rockable link |01. The other end
brought out.
of link I 87 is disposed between outer ends of two
Operation
arms |08 of a lever |09 and is rockably connected
thereto by a pin IIO. The two arms |08 are 20
In operation, let it be assumed that member
integrally connected intermediate their ends by
||3 is connected to the device which it is desired
a. bridge I I I. Disposed between the opposite ends
to operate or adjust. Let it further be assumed
of the two arms |08 are jaws I |2l provided onone
that the fluid pressure supply pipe 851s connected
end of a member |I3 which is provided for con- .
to a suitable source of ñuid under pressure; that
necting the device to the means to be operated, 25 the control pipe 51 is connected to a suitable op
such as an engine governor. The piston rod 24
erator's control valve device, and that the vernier>
has a tongue II4 disposed between the jaws II2.
controlpipe 68 is connected to a suitable opera
The Irlston rod 24 is connected to the member
tor’s vernier controlvalve device.
I|3 and the ends of the lever arms |08 by a pivot
With pipe 65 supplied with fluid under pressure
pin I|5 having an axial portion |_I5 at one end 30 from the source, fluid under pressure will equalize
extending through and operatively connecting
into chamber 5| between the two diaphragms I2
one of the lever arms I 08’to the’adjacent jaw
and I3 and thence past the ribs 83 on the supply
I I2. The pivot pin |I5 has another axial portion
valve stem 82 into chamberv 15 and from chamber
II1 extending through and operatively connect~
15 through bores 16 and 11 into chamber 61 be
ing the other lever arm |08 to the jaw, and the 35 tween the diaphragms I4 and I5. The pressure
two axial portions ||6 and I|1 are connected by
'of fluid in chamber 5I acting on diaphragm I2
counteracts said pressure acting on diaphragm
a part in the form ofan eccentric I|8 which
extends through and operatively connects the
I3, and vice versa, and the same is true with re
piston rod 24 to the pivot pin I I5 and thereby
spect to said pressure in chamber 81 acting on
to member II3. The eccentric IIO bears in the 40 the diaphragms I4 and I5, so that such pressure tongue II4 of the pistonrod against a bushing
will have no effect upon operation or positioning
'
ofthe structure longitudinally of the device.
The axial portion |I1 of the pivot pin ||5 is
It is intended that by operation of the opera
of greater diameter than the axial portion I I6
tor’s Vernier control valve device fluid at a chosen
and bears at its inner end against the adjacent 45 nominal pressure, such as twenty-five pounds,
will normally be provided through pipe 96 in
face of the piston rod tongue II4. On the outer
end of the axial portion |I1 is an adjusting disc
chamber 60 between the two diaphragms I3 and
' |20 bearing against the adjacent Vlever arm |08.
I4, and since the diaphragm I3 is of greater di
ameter than diaphragm I4, this pressure will
'I'his disc is provided across its outer face with
a screw driver slot |2I for turning the disc and create a force acting v,inthe direction of the left
hand, asviewed in the drawing, equal to the pres
pin I|5 relative to the piston rod 24 and other
connected parts. The disc |20 also has a semi
sure of such fluid times the difference in areas of
the two diaphragms.
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,
circular through slot |22 adjacent its peripherlal
The minimum pressure normally provided
edge through which extends a stud I 23 secured
through control pipe 51 in chamber 58 to act
in the adjacent lever arm |08. A nut |24'on stud
on diaphragm I5 is preferably of a chosen low
I 23 is provided for securing the disc |20 and
thereby the pivot'pin- | I5 to the adjacent lever
degree, such as five pounds, and in use, the oper
II9 provided in said rod.
ator’s control valve device is intended to vary the
pressure of iluid in chamber 56 only between this
arm |08 for movement therewith. Loosening of
nut |24 providesfor adjustment of the pivot pin
||5 relative to the lever |09 and member ||3 and
thereby angular adjustment of eccentric | I8 rela
tive to the end ofthe piston rod 24.
60 low pressure and a selected higher pressure such
as fifty pounds. It will be noted that this pres
sure effective on diaphragm I5 also creates a
force urging the parts of the device in the direc
The adjustingslot |22 is so arranged in the
tion of the left hand. The pressure of spring 1|
disc |20 that with the disc secured in a position
with the stud |23 at the center of slot |22, a line 65 also acts on diaphragm I5 in the same direction.
intersecting the axes of the pivot pin ||5 and
eccentric |I3 rwill be vertical to a line intersecting
the axes of the pivot pin and of-pin |I0 at the
opposite end of lever |09. Adjustment of the
pivot pin ||5 by turning disc |20 in a counter 70
clockwise direction,V as viewed in Fig. 1, willin
` crease the distance between theicent‘er of the
eccentric and pin ||0 and thereby increase the
length of the lever arm for the piston rod 24,
The pressure of spring 1| is so adjusted by
shims 12 that its force plus the minimum pres
sure of fluid (five pounds) acting in chamber 56
on diaphragm I5, plus the force created by the
normal pressure (twenty-five pounds) of fluid
in chamber 60 acting on the differential areas of
diaphragms I3 and I4 will, with the parts of the
device in the positions shown in the drawing, just
balance the opposing force of control spring 30
while adjustment in a clockwise direction will 75 applied through stop 42 to the followers, spacers,
2,411,749
sleeves, etc. connecting the central portions of
ply of fluid under-.pressure to pressure chamber
22 will thus be cut of! when it is increased to a
degree for sumcientiy increasing the pressure of
of the device positioned as shown in the drawing,
spring 3l to offset the increase in pressure of
the stop flange 43 of the strut member 42 is
fluid in the control chamber Il, andto thus 4re
slightly spaced away from stop collar 45 carried
store the balance of opposing forces, 'above men
by the non-pressure head l of cylinder I, per
mitting the plunger 81 to be positioned with re
It will now be seen that the piston I0 will be
spect to the member 89, which is fixed with re
moved away from ~the stop 82 a distancev corre
spect to the casing, S0 that the supply valve 19
will be closed by spring 85 and the release valve 10 spondingI to the pressure of fluid provided in
chamber 22, and thus corresponding .to the in
94 will also be closed by said spring acting
crease in pressure of fluid in control chamber 56,
through the supply valve and the stem |02 pro
and it will be further noted that the operated
iecting therefrom and contacting the release
- member ||3 and device being controlled will be
valve. Under this condition pressure in chamber
the several diaphragms together. With the parts
tioned.
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1
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31 and pressure chamber 22 will beat such a low 15 also adjusted to correspond.
If the operator desires to cause the member
degree, for reasons which will hereinafter be
||3 to move further in the direction of »the right
brought out, that piston l0 will be in contact with
hand, he will increase the pressure of fluid in
stop 32 and the operated member ||3 will be
occupying the position shown in the drawing.
chamber 56 thereby again destroying the balance
20 of opposing forces, and the structure will then
operate in the same manner as above described
ated member ||3 in the direction of the right
to cause a corresponding new adjustment of mem
hand to 'effect an adjustment of the device being
If the operator now desires to move the oper
ber II3. Within the limits of :the device, the
controlled, he will increase, through control pipememberl H3 can thus be caused to move from
51, the pressure of fluid in chamber 56 acting on
the diaphragm i5. This increase in pressure of 25 the position shown in the drawing to any se
lected position to the right -hand side thereof,
fluid will destroy the balance of forces above
and such movement may be effected in any de
mentioned, and produce a force exceeding that of
sired steps, by providing in the control chamber
spring 30, as a result of which the central _portions
55 fluid at the proper selected pressures.
of the several diaphragms and the connecting
Withthe member H3 adjusted out of its nor
sleeves, etc. will move in the direction of the left 30
mal position in the direction of the right hand,
hand to a position limited by contact between
stops 39 on follower 38 and the non-pressure head _ if the operator should desire to cause said mem
ber to move back toward the position in which
4. This movement will be relative to the member
it is shown in the drawing, he will reduce the
89 and plunger 81 which are supported by the
casing against movement, and as a result the re 35 pressure of fluid in chamber~55, whereupon the
force of spring 30 will exceed the opposing forces
lease valve 94 will remain stationary and act
and acting through strut member 42 will shift
through pin 95 and its head |007 and stem |02
the diaphragms and supply valve 19 in the direc
projecting from the supply valve 19 to hold said
tion of the right hand from the positions shown
supply valve against movement, so that the seat
for the supply valve will move out of contact 40 in the drawing. _ Due to the yaction of spring |0|,
the release valve 94 will move with the supply
therewith. Fluid under pressure will then flow
valve and thus be shifted out of seating engage
from chamber 5| past the supply valve 19 to
ment with the plunger 81 which will be held by
chamber 80 and thence to chamber 31 between
spring |0| in contact with member 89 and thus
the two diaphragms | I and I2 and from the latter
against movement. When the release valve 94
chamber through passage 23 to pressure chamber
22. -Since the diaphragms || and l2 are of equal . is thus opened, fluid under pressure will then be
released from pressure chamber 22 through pas
areas, the pressure of fluid obtained in chamber
sage 23, chambers 31 and 80, spaces '98, recess 99,
31 and acting on either diaphragm in one direc
passages 92 and 93 in the plunger stem 88 -and
tion is counterbalanced by its opposing effect on
thence to atmosphere.
the other diaphragm, as will be apparent.
As the pressure of fluid in pressure chamber
When the pressure of fiuid thus provided in
22 is thus reduced, the spring 30 will expand and
pressure chamber 22 is increased sufl‘lciently to
move the piston l0 back toward its normal posi
overcome the opposing force of spring 30 on
tion, and a reduction in the force of said spring
piston I0, said piston will move away from stop
32 against the opposing pressure of spring 30 and L against the diaphragms will occur. Assuming
that the pressure in control chamber 56~is not
thereby act through the rod 24 to draw the mem
reduced to its normal value (ñve pounds) then
ber ||3 toward the right hand towards its new
when the pressure of fluid in pressure chamber
position.
»
22, and consequently -the pressure of spring 30
The piston I0 as it is being moved under the
pressure of fluid provided in chamber 22, will act 60 has become reduced to substantially the same
degree as the opposing forces including the re
to compress spring 30 and thus increase the
duced pressure of fluid in chamber 56, said op
spring force applied through follower 29 and stop
posing forces will gradually shift the diaphragme
42 to the central portions of the diaphragms.
and both the supply -and release valves toward
When this force is increased to a degree sub
stantially equaling the increase in the opposing 65 the left hand. and at the time the balance be
tween opposing forces is obtained, the release
force created by the increase in pressure of fluid
valve 94 will engage its seat and thus prevent
in diaphragm chamber 56, said spring will act
further ' release of fluid under pressure from
to move strut member 42, the central portions of
chamber 22. Thus the reduction in pressure of
the diaphragms and the connecting sleeves back
in the direction of the right hand, This move 70 fluid in chamber 22 will be limited in proportion
to the reduction in control pressure in chamber
ment will be relative to plunger 81 and _to the
56, and the piston | 0 will therefore move the
release valve 94 and supply valve 19 which are
at this time supported by said plunger, and will
` member l|3 to a corresponding position.
In case the operator effects a further reduc
continue until the seat for the supply valve moves
into contact with said supply valve. The sup 75 tion in the pressure of fluid in chamber 56 the
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2,411,748
10
_*_mon operator’s control valve. By operating the
control valve the operator could then accelerate
structure will again operate as just described to
eiïect a corresponding further reduction in pres
sure in chamber 22 anda corresponding change
or decelerate the engines in unison to any desired
in position of piston 22 and of member II3. The
degree. Then in case the speeds or outputs of
member> I I3 m`ay be thus caused to return toward el power of the two engines were not identical, theoperator 'by ,proper adjustment of pressure of
its normal position in’ any desired steps as se
lected bythe degrees of reduction in pressure ofv
fluid in chamber 56.'
In case the pressure of iluid in chamber 56 is
fluid in chamber 60 of one of the control devices'
could change the speed or output of the respec
tive engine to the same degree or value as that
reduced to its normal minimum value of five 10
pounds, the structure will again operate in the
-of the other engine.
I
same manner as above described to open the
In such an installation, the vernier'control of
one engine might be suillcient to match the two
release valve 94 and permit further release of
engines. At the other engine, pipe 66 would not
therefore be required and chamber 60 could be
tluid under pressure from piston chamber 22.
Under the action of spring 30, the piston III will 15' open to atmosphere with a consequent loss oi'
force for opposing spring 30. This loss of force
then move back into contact with stop 32, per
may however be compensated for by placing ad
ditional shims ‘I2 under the spring ‘II so that the
device will operate in harmony with the other
thereby reduced, the normal pressure of fluid in
chamber 56 plus the pressure of spring 'II will 20 device having ñuid pressure in chamber 60.
In the manufacture of springs, such as spring
return the diaphragms to their normal positions
30, it is substantially impossible to produce on a
and seat the release valve 94 at substantially the
commercial basis two springs having identical
time the piston contacts stop 32, thereby bottling'
characteristics. Springs are therefore 'usually
the remaining ñuid in chamber 22, which pres
mitting the pressure of said spring to reduce to
its normal value.v As the force of spring 30 is
sure may be near atmospheric pressure or of a 25 manufactured to certain limits, so that with re
spect to spring pick-'up a greater degree of de
i‘lection may be required to obtain a certain spring
force withone spring than would be required
with another spring, and as applied to spring 30,
upon reducing the pressure of iiuid in the control
pipe 51 to the normal value will cause return of 30 the one spring would allow greater movement of
piston I0 away from stop 32 than would be per
the member II3 to its normal position, as will
greater degree, depending upon the coniined
force of spring 30. This is however immaterial,
since the return of piston I 0 to its normal position
be apparent.
mitted by the other spring with piston I0 subject
It will now be seen that the mem
to fluid at the same degrees of pressure. Stated
in another way, with the maximum control pres
ber II3 may be adjusted out of normal position
to any selected position or in the reverse direc
tion to any selected position, or may be returned
35
sure provided in >diaphragm chamber 56, and in
pressure chamber 22, a spring 30 with greater
pick up would permit less total movement of
proper selected pressure or pressures in chambel!
piston I0 away from stop 32 than wouldl occur
56.
with a spring with less pick up. Consequently
If the member II3 cannot be adjusted with a
suiiicient degree of accuracy by varying the pres 40 the total stroke of piston I Il will depend upon
the pick up of the particular spring 30 employed,
sure in chamber 56, then after, what may be
and in different devices or in the saine device in
termed a rough adjustment in response to a se
case spring 30 is changed; may therefore be either ,
lected pressure change in said chamber, the oper
greater or less than the normal chosen stroke.
ator may eil'ect s, fine adjustment of said member
by effecting through pipe 66 a change in pres 45 If the member II3 is connected to a member
for controlling an engine governor which latter
sure in the vemier control chamber 60. An in
member has a ñxed range of movement to pro
crease in pressure of ñuid in chamber 60 Will in
vide for varying of engine speed from minimum
crease the force opposing spring 30, while a re
to maximum, lthen it is necessary to provide for
duction in pressure of fluid in chamber 60 will
reduce the force opposing spring 30, and the 50 adjustment of the connection between the mem
ber II3 and the piston rod 24 according to the
device will operate in response to such increase
pick up characteristic of the spring 30 so as to
or decrease in pressure of fluid in chamber 60 to'
limit the range of movement of member II3 to
eiïect a proportional change in position of mem
the i'lxed .degree in case the stroke of piston III
ber II3 in either one direction or in the opposite _
direction in the same manner as before described. 55 as permitted by said spring is greater or less than
said ñxed degree. This adjustment is accom
It is desired to point out that for a certain change
plished by the means including the eccentric I I8.
in pressure of fluid in chamber 60 the change
With the eccentric I I8 and adjusting disc I2II
in force is only a fraction of that resulting from
adjusted as shown in Figs. 6 and 1, respectively,
a like change in pressure of fluid in the main
control chamber 56, due to the diaphragm I5 60 the axis of the connection between the piston rod
24 and said eccentric will merely move from the
being of greater area than the difference in areas
position shown in Fig. 6 above the axis of the
of diaphragms I3 and I4. Hence a iiner change
connection between member> II3 and the pivot 4
in force and adjustment of member II3 may be
to normal position by _providing fluid at the
effected by varying pressure of fluidL in chamber
vpin II5 o-r portion IIS thereof, to a correspond
65 ing position below, so that the movement of mem
ber I I3 will be the same 'as that of piston rod 24.
`This iine or vemier control> of adjustment of
60.
-
This adjustment of the eccentric will be employed
in case the pick-up of spring 3u is normal.
Now if the adjusting plate |20 is turned coun
trol in unison from a master controller and it is 70 terclockwise from normal position to the extent
limited by contact with stud I 23, the axis o1' the
desirable to match the output of the engines. In
connection between the piston rod 24 and eccen
an installation embodying say two engines, both
tric IIB will be moved. to and remain below the
would be provided with a control devicesuch as
shown in the drawing and the pressure chamber
connections between member II3 and the pivot
56 in both devices would be connected to a com 75 pin II5 thereby providing for a maximum move
member I I3 is of particular value in for instance
multiple engine installations where the speed or
power output of all engines is arranged for con
.
Q
I
v
2,41 1,748
12
11
2. A fluid pressure control device comprising a
ment of pi-ston l0 in excess of the required move
casing, a control spring, a powerpiston in said
ment/ of member ||3. Lesser degrees of move-`
casing subject to opposing pressures of said spring
ment of piston I0 in excess of the required move
and of fluid in a power chamber and adjustable
ment of member | I3 may be obtained by suitable
to different positions corresponding to different
adjustments of disc |20 between normal position
pressures of fluid in said power chamber, valve
and the position above mentioned defined by stud
means operable to supply and to release fluid un
|23. Thus if the pick-up of spring 30 is less than
der pressure to and from said power chamber,
normal, the proper adjustment of di-sc |20 coun
said spring acting on said valve means to actuate
terclockwise from its normal position will match
the movement of piston |0 to the fixed range of 1.0 same relative to said piston for releasing fluid
under pressure from said power chamber, a con
movement of member H3.
trol movable member in said casing connected to
On the other hand, if the pick-up of spring
30 is greater than normal which would result in
said valve means and operable upon an increase
less movement of piston l0 than required of mem
in pressure of fluid in a control chamber above
ber ||3 the disc |20 may be turned from its nor 15 a normal degree to actuate said valve means
against said spring to supply fluid under pressure
-mal position in a clockwise direction which will
raise the axis of the connection between the pis
to said power chamber, movable means in said
casing connected to said valve means and subject
ton rod 24 and eccentric to a point above the
axis of the connection between member ||3 and
to pressure of fluid in a third chamber which
the pivot pin I I5, so that the lever |09 will act to 20 pressure in said third chamber coacts with pres
increase the movement of .member ||3 with re
sure of ñuid in said control chamber acting on
spect to that of the piston rod. By suitable ad
said control movable member, -and spring means
justment of disc |20 to the spring 30 the fixed
cooperabie with pressure of fluid effective on said
degree of movement of member ||3 can therefore
control movable member 'and on said movable
be obtained.
25 means to counterbalance pressure of said control
Thus regardless of the pick-up characteristic
Spring.
of the particular spring 30 used in the device,
3. A fluid pressure control device comprising a
within the permissible limits of variations of said
casing, a control spring, a power piston in said
spring, adjustment of the eccentric ||8 to the
casing subject to opposing pressures of said spring
particular spring will limit the range of move 30 and of fluid in a power chamber and adjustable
ment of member ||3 to the desired fixed degree,
to different positions corresponding to different
or will provide for obtaining such fixed degree
pressures of fluid in said power chamber, valve
of movement, as the case may be.
means operable to supply and to release fluid
After adjusting the eccentric it must be locked
under pressure to and from said power chamber,
to lever |09 in the adjusted condition by tighten 35 said spring _acting on said valve means to actuate
ing nut |24 against disc |20.
samerelative to said piston for releasing fluid
Summaïy A
under pressure from said power chamber, a con
trol diaphragm in said casing connected to said
It will now be seen that Iv have provided a
valve means and operable upon an increase in
relatively simple, , compact and eilîcient device 40 pressure of fluid in a control chamber above a
embodying a fluid motor and fluid pressure con
normal degree to actuate said valve means
trolled means for controlling said motor. The
against said spring to supply fluid under pressure
structure is particularly applicable for control
to said power chamber, diaphragm means in said
casing connected to said valve means and subject
and accurate adjustments of a device to be con 45 to pressure of fluid in a third'chamber which
trolled, and where the adjustments are within
pressure in said third chamber coacts with pres
a given range, the operation of the structure may
sure of fluid in said control chamber acting on
be regulated to meet the range regardless of per
said control diaphragm, and spring means coop
missible variations in the control spring.
erable with pressure of ñuid effective on said con
Having now described by invention, what I
trol diaphragm, and on said diaphragm means to
claìinii as new and desire to secure by Letters Pat
counterbalance pressure of said control spring,
en , s:
said valve means comprising a poppet type supply
l. A fluid pressure control device comprising
valve and a poppet type release valve, and said
a casing, a control spring, a power piston in said
power piston, said springs, and said control dia
casing subject to opposing pressures of said con 65 phragm and diaphragm means being all arranged
trol spring and of fluid in a power chamber and
in coaxial relation with said supply and release
from a remote control station to provide prompt
adjustable to different positions corresponding to
valves.
-
’
diiîerent pressures of fluid in said power cham
4. A fluid pressure control device comprising a
ber, valve means operable to supply and release
casing, a control spring, a power piston in said
fluid under pressure to and from said power 60 casing subject to opposing pressures of said
chamber and subject to pressure of said control
spring and of fluid in a power chamber and ad
spring which is eiïective to actuate said valve
justable to different positions corresponding to
means to release fluid under pressure rfrom said
different pressures of fluid in said power cham
ber. valve means in said casing operable to supply
power chamber, a movable member in said cas
ing connected to said valve means and subject to
and to release fluid under pressure to and from
pressure of fluid in a control chamber which op
said power chamber, said valve means comprising
poses pressure oi' said control spring on said valve
a poppet type supply valve, a poppet type release
means and operable upon an increase in pressure
valve, means providing for movement of said
of ñuid in said control chamber to actuate said
valves in unison, a seat for said release valve fixed
by said casing, a movable seat for said supply
valve means to supply fluid under pressure to
said power chamber, and movable power means
valve operable upon movement in one direction
insaid casing connected to said valve means and
to first seat said release valve and then move out
of seating engagement with said supply valve and
subject to pressure of fluid in a third chamber
operable upon movement in the opposite direction
which opposes pressure of said spring on said
u into seating engagement with said supply valve,
valve means.
«2,411,748
13
control chamber in which pressure of ñuid ía#
adapted to be varied, 'and a balance spring in
said control chamber acting on the adjacent dia
meansioperable upon 'further movement of said I
movable seat in _said opposite direction to open
said release valve, means for conducting ñuid
under pressure to said supply valve for supply to
said power chamber, said spring acting on 4said
phragm with a force which, cooperating with V
iluid in a control chamber and operable upon an
pressure of fluid in said control chamber acting
on the adjacent diaphragm plus pressure of Ȗuid
in said bias chamber effective on the difference
in areas of the respective diaphragms forming
said bias chamber, counterbalances the pressure
ing=to provide a' bias chamber normally charged
ta casing, a control spring, a power piston in said `
chamber is effective to provide a force opposing
sponding to the pressure of such fluid, valve
movable seat to urge same in-said opposite direc
tion, a movable wmember in said casing‘connected
to said movable seat and subject to pressure of
increase in such pressure to move said seat in said 10 of said control spring on said power piston with
both said release valve and supply valve closed.
one direction, a pair of flexible diaphragms in
6. A fluid pressure control device comprising
said casing connected to said seat >and cooperat- ,
casing subject to pressure of said_ spring and to
with ñuid under pressure, one of said diaphragms
being o_i' greater area than the other and so ar 15 the opposing pressure of fluid in a power cham
ber and adjustable to different positions corre
ranged that the pressure of fluid-_in said bias
means in said casing .for controlling pressure of
iluid in said chamber and comprising a supply
acting on said movable member in opposition to
pressure of said control spring with a force which 20 valve, a release valve and a movable member op
erable upon movement inone direction to‘ñrst
combined with pressure of fluid in said -control
close said release valveV and then open said sup- i
'chamber acting on said movable member and
ply valve to supply fluid under pressureto said
pressure of fluid in- said bias chamber _effective
>chamber and operable upon movement in the
‘on 4the difference in areas of said diaphragms
-opposite direction to first close said supply valve '
counterbalances the pressure of said control
pressure of said control spring, and spring means
spring with4 said power chamber supplied with
. iluid 'at a pressure corresponding to pressure of
' iluid in said control chamber. e
and to then eiîect opening of said release valve
¿ for releasing iiuid under pressure from said
chamber, said spring acting on said movable
5. A nuid pressure control device comprising a _
casing, a control spring, a power piston in said soA
casing subject to pressure of said spring and to
'the opposing pressure of fluid in a power cham
ber and adjustable to diil‘erent positions corre
sponding to the pressure of such fluid, valve
means in said-casing for controlling pressure of 35
` fluid in said chamber and comprising a supply`
valve, a release valve, and a movable member op
«erable upon movement in one direction to ?rst
close said release valve and then open said supply
member urging same in said opposite direction,
a‘pair of flexible diaphragms in said casing of
the same areas and arranged in coaxial relation
and connected to said -movable member and co
operating to ~form a -ñuid pressure supply cham
ber open to said supply valve and supplied with
fluid under pressure, a third iiexible diaphragm
'in said casing of the same area as said-pair and ,
arranged ~in coaxial relation therewith and con- '
' nected to said movable member, said third dia
phragm and the adjacent one of said pair co
' valve to supply fluid under pressure to said power 40 operating to form a chamber open to said power
chamber and operable upon movement in‘ the . chamber and containing said release valve and
opposite direction to first close said supply valve
and to -then eiïect opening oi’ said release valve
for- releasing ñuid under pressure from said power
chamber, said spring acting on said movable
memberurging same in said opposite direction,
a pair of flexible diaphragmsof the same areas
and arranged in coaxial relation and connected
to said movable member and cooperating to form
a iluid pressure supply chamber open to said
supply valve and supplied with iluid under pres
sure, a third ilexible diaphragm o1 the same area
as said pair 'and arranged in coaxialV relation»
thereyvith, and connected to said movable mem
arranged tore'ceive fluid under pressure supplied
by said supply valve, another pair ofilexible dla
phragms in said casing arranged at the side of ,
the nrst named pair of diaphragms opposite said
third diaphragm and also connected to said mov
able member, the -other pair of diaphragms being `
of smaller areas than the first named diaphragms>
and arranged in coaxial relation therewith and
cooperating to form a chamber open to said iluid.
pressure supply chamber, the adjacent two of
theflrst and last named pairs oi' diaphragms co
operating to form a bias pressure chamber, and
thev outermostof the last `named pair of dia-v
ben-said'third diaphragm and theadjacent one 55 phragms having at its outer face a control cham
ber in which pressure of iluld is> adapted to be '
of said pair'cooperating to form a chamber open
` varied, and a balance spring in said control
to said power chamber and containin said re
chamber acting on the adjacent diaphragm with
lease valve and arranged to` receive uid under
la force which cooperating with pressureof ñuid
pressure supplied by said supply valve, _another
in said control chamber acting on the adjacent
pair oi’ ñexible diaphragms arranged at -the side
diaphragm plus «pressureof fluid. in said bias
y oi' the‘nrst named pair of diaphragms opposite
chamber en'ective on> the difference in areas ofv
said third'diaphragm and also connected to said
movable member, the other pair of diaphragms
:the respective diaphragms forming said bias
being of smaller areas than the nrst named dia
chamber counterbalances -the pressure of said
phragms and> arranged in coaxial relation there
with and cooperating to form a chamber open to
control spring on said power piston with both .
-said fluid pressure supply chamber, the adja
said'vrelease valve and í.supply valveclosed, said
lvalves being of the popnet type and said springs
cent two of the nrst and last named pairs of
being of the coil type, and said valves. springs and '
diaphragms cooperating to iorm a bias pressure '
power piston being all arranged in coaxial rela-~
chamber, and the outermost of the last named
patriot diaphragms having at it! outer im -ß 70
tion with saidv diaphragms.
y
,
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'
_
Om 8. KELLEY.
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