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Патент USA US3067770

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Dec. 11, 1962
w. H, HAVERLAND ETAL
3,067,760
VOLUME-CONTROLLED ACTUATOR FOR BISTABLE VALVE MECHANISMS
2 Sheets-Sheet 1
Filed June 12, 1961
g»
INVENTORS
W/LL/AM H. HAVE/PLA/VD
BIRCH/7RD M. BRUSH
ATTORNEYS
Dec. 11, 1962
w. H. HAVERLAND ET AL
3,067,760
VOLUME-CONTROLLED ACTUATOR FOR BISTABLE VALVE MECHANISMS
2 Sheets-Sheet 2
Filed June 12, 1961
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INVENTORS
W/LL/AM H, HAVE/PLAND
B/RCHARD
BY
M. BRUSH -
Kym
A T TORNE Y5
3,057,760
Patented Dec. 11, 1962
2
VGLUME-CUNTROLLED ACTUATDR F?R
as low initial cost and a decorative appearance could, if
necessary, be sacri?ced in order to realize the aforemen
tioned characteristics of a more functional nature.
BISTA‘BLE VALVE MECHANISMS
William H. Haverland and Birchard M. Brush, Denver,
provide a volume-controlled actuator for bistable valve
3,067,760
It is, therefore, the principal object of the invention to
(1010., assignors to The .I. .I. Monaghan Company, Inc.,
Denver, Colo, a corporation of Colorado
Filed June 12, 1961, Ser. No. 116,398
22 (Zlaims. (Cl. 137-63)
mechanisms adapted to deliver predetermined quantities
of a gaseous medium on an intermittent basis.
A second objective is the provision of a device of the
class described which incorporates a gas-?ow actuated
This invention relates to a volume-controlled actuator .10 nutating plate as the motor mechanism for the counter
assembly.
for bistable valve mechanisms operative to close the latter
Another object of the invention is to provide a ?uid
upon delivery therethrough of a pre-determined quantity
of a gaseous medium on an intermittent basis.
actuated clutch operative to engage the gear train or simi
ous medium on an intermittent basis.
of gas has been delivered.
lar mechanism of the counter assembly for the purpose of
Gaseous flow-controlled systems of the type associated
with respiratory equipment for medical use require the 15 operating the spring-biased reset unit that shuts off the
gas flow to the patient once the pre-determined volume
delivery of accurately predetermined quantities of a gaseé
The volume of
Still another object is the provision of an adjustable
‘gas delivered to the patients’ lungs during each inhalation
stop capable of controlling the volume of gas passed to
phase of the breathing cycle will vary with each patient’s
lung capacity. Also, the pressure of the gas within the 20 the patient through the nu-tating plate before the fluid
actuated clutch functions to disengage the counter as
lungs must be maintained below a pre-set maximum or
sembly.
there is danger that the lungs may burst or rupture.
An ‘additional objective is to provide a volume-con
As far as volume-controlled systems in the prior art
trolled gaseous delivery system which is compatible for
are concerned, about the only one that has ever been
25 use in combination with a pressure-controlled system,
used causes the gaseous medium from a pressurized source
the latter providing an overriding safety feature prevent
thereof to be delivered into an in?atable bag of some type
ing excessive gas pressure in the lungs arising from a
which is then de?ated to force the volume of gas con
malfunction.
tained therein into the patient’s lungs. The many de
ficiencies of such a system become readily apparent when
Further objects are the provision of an invention of
it is realized that there is no assurance all of the gas con
the type aforementioned which is versatile, easily op
tained in the bag is used during each inhalation of the
patient and any residual quantities will be left in the bag
to combine with subsequent full volumes delivered there
mum of training, ideally suited for use as a gaseous ?ow
erated by even relatively unskilled personnel with a mini
control system for a number of different commercially
to. Such a unit is also bulky and, therefore, cumbersome 35 available respiratory devices, ‘and one that does not in
terfere or diminish the eifectiveness of other units used
to use even in hospitals. Furthermore, inherent in such
in combination therewith.
a system are the inaccuracies occasioned from the use of
Other objects will be in part apparent and in part
?exible rubber bags or bellows arrangements that can
pointed out speci?cally hereinafter in connection with
stretch when expanded. As a result, most of the prior
art systems are pressure, rather than volume, controlled. 40 the description of the drawings that follows, and in
which:
Having little in the way of volume-controlled respira
FIGURE 1 is a schematic view in section showing the
tory systems in the prior art for use as a basis of com~
volume-controlled valve actuating mechanism of‘ the
parison, it will be well to examine brie?y the criteria
present invention'with the counter unit thereof engaged
upon which the design of such a system must be predi
cated. First of all, some kind of mechanical counter 45 to furnish a predetermined quantity of gaseous medium
received from a pressure-controlled bistable valve used in
capable of accurately measuring the quantity of gas de
combination therewith and in overriding relation thereto;
livered to the patient is desirable. The counter should
FEGURE 2 is a fragmentary detail of the counter
be actuated by the flow of pressurized gas being delivered
mechanism and automatic reset unit thereof as it ap
to the patient rather than some electrical or electro
mechanical energy source which have proven to be most 50
dif?cult to isolate to the extent required for use in an ex
plosive atmosphere such as may exist in an operating
room. In this same connection, it follows that the counter,
if it is to be ?ow-actuated, must be responsive to a rela
tively low-level energy source such as is found in a pres
sure-regulated bottle of compressed gas.
Under ideal conditions, the counter should reset auto
matically at the end of each inhalation phase of the breath»
ing cycle in order to eliminate cumulative errors that.
pears during the inhalation phase of the respiratory cycle;
FIGURE 3 is a fragmentary detail similar to FIGURE
2 except that the ?uid-actuated clutch has disengaged the
elements of the gear train permitting the spring-actuated
reset unit to return the counter mechanism to its starting
55
position which occurs during the exhalation phase of the
respiratory cycle;
FIGURE 4 is a schematic sectional view similar to
FIGURE 1 showing the pressure-controlled gas delivery
system of the combination at a time slightly farther ad
vanced during the inhalation phase of the breathing cycle;
are diflicult, if not impossible, to remove from an addi 60
and,
tive system. To accommodate the different volumetric
FIGURE 5 is a schematic view ‘shown in section simi
'ra
requirements ‘of the human lungs, adjustment of the vol
lar to FIGURE 4 except that the elements of the pres
ume being delivered by the system is certainly desirable.
sure-controlled system of the combination have been
‘Furthermore, because the volume-controlled system is
shown moved to the inoperative position corresponding
not the complete answer to the problem of respiratory 65 to the exhalation phase of the breathing cycle due to the
equipment in and of itself, it is preferably usable in com
action of the counter mechanism of the volume-controlled
bination with a pressure-controlled system capable of
system.
overriding the volume-controlled unit Whenever the gas
Referring now to the drawings for a detailed descrip
pressure within the lungs reaches a pre-set maximum.
tion of the gaseous ?ow control system of the present in
Incidental, but signi?cant, features would be, of course, 70 vention and in particular to FIGURE 1 for this purpose,
it will be seen to comprise basically a valve assembly
a unit which is compact, relatively free of service diffi
which has been indicated in a general way by numeral
culties and convenient to use. Other advantages such
3,067,760
In;
10 and a volume-controlled actuating system therefor
that has been designated broadly by reference character
12. The valve assembly 10 can be any one of a number
of different bistable types connectable to a source of a
gaseous medium under pressure for purposes of deliver
ing same at a relatively uniform flow rate on an inter
mittent basis. In other words, the instant invention is
useful in any apparatus for delivering a gaseous medium
A
?owing in the main gas conduit 14. The nutating plate
assembly that has been indicated broadly by numeral 6i)
is of conventional design comprising a housing 62. having
an inlet 64 connectable to receive gas from conduit 14
and an outlet 66 on the opposite side from which the gas
is exhausted into delivery tube 63. The cavity 70 sepa
rating the inlet and outlet ports 64- and
that carries
the nutating plate 58 is divided by- a web 72 which ?ts into;
on an intermittent basis Where such apparatus includes
corresponding slots (not shown) in the piate that prevent
as an element thereof a valve mechanism stable in both 10 the latter from turning thus restricting its action, to a
the open and closed positions which when moved from
closed into open position by some external force acting
thereon must be closed again following delivery of a pre
wobbling motion as the ?owing air impinges thereupon.
description an explanation will be given concerning the
The spherical hub 56 rests within a correspondingly
shaped seat in the center of the cavity 70‘ in housing 62.
The action of the plate as it wobbles within housing 62
is to turn stem 54 around in a direction depending upon
the direction of the ?ow of gas through the cavity. As
this stem turns it, in turn, turns shaft 30 by means of
kicker 52 thus activating the elements 34, 36 and 42 of
the gear train whenever gas is flowing and also driven
element 44 when the piston is extended to move the rocker
arm 26 into the operative position whereby a driving
connection is formed between elements 36 and 44.
Shaft 4-6 carrying the driven element 44 of the drive
mechanism 33 is biased in a direction opposite to that at
which it is rotated by said drive mechanism when the
?uid-actuated clutch assembly moves element 34 into
driving relationship therewith. The biasing means com
prises a loose-wound spiral spring 74 having one end
thereof connected to shaft 46 while the other end is at
tached to fixed abutment '76. A pusher element 78
manner in which this particular bistable valve and other
projects from shaft 46 in position to engage adjustable stop
determined gaseous volume preparatory to the receipt of
ya second actuating impulse. For the purposes of the
present description it will be assumed that the initiating
force used to move the valve mechanism from its stable
closed position into a stable open position is the begin
ning of the inhalation phase of a patient’s breathing cycle
although it is to be clearly understood that the par-tic
ular means by which the valve mechanism is opened is
entirely immaterial. As a speci?c example of one type
of bistable valve that is ideally suited for use with the
volume-controlled actuator which forms the subject mat
ter hereof, the pressure-controlled valve that is disclosed
and claimed in United States Patent 2,881,757 has
been illustrated somewhat schematically and reference
should be made to the aforesaid patent for details con
cerning its construction and operation. Later on in this
pressure-responsive ones can perform an important added
8% at one extremity of its travel with shaft 46 and
function in combination with the instant volume-con
trolled actuator therefor; however, for immediate pur
poses it is desirable to restrict the descriptive material
to an. analysis of the actuator assembly 12. For this pur—
pose, reference will be made to FIGURES 1, 2 and 3.
FIGURE 3 shows the actuator mechanism 12, in its dis
engaged or inoperative position which is the one which it
push-rod 82 which closes the bistable valve assembly 10
occupies when the valve assembly 14} is closed; whereas,
as soon as the valve opens and the gas is admitted into
conduits 14 and 16 of FIGURE 1, said mechanism moves
into the operative position of FIGURE 2. Fluid-actuated
clutch mechanism indicated generally by numeral 18 is
responsible for shifting the actuator assembly between
its operative and inoperative positions. This clutch
mechanism comprises a cylinder 2i} connected to receive
gas through conduit 16 whenever the valve mechanism
It) is open. Piston 22 mounted for reciprocal movement
within the cylinder is extended against the action of com
pression spring 2.4 to shift rocker arm 26 connected to
the free end of piston rod 28 from the disengaged posi
tion of FIGURE 3 to the engaged position of FIGURE 2.
Rocker arm 26 is pivotally attached to the piston rod
at the other.
In the particular form shown, adjustable stop 8-0 com—
prises a crank-like element in which the offset leg portion
forms the stop while the other leg portion 84 parallel
thereto is mounted for frictional rotation within a sup
porting plate 86 in substantial coaxial alignment with the
axis of rotation of shaft 46. The free end of leg portion
84 of the crank-like stop element carries a knob 88 by
means of which the offset leg portion thereof is adjusted
angularly. Leg portion 84 also carries a pointer 90
adapted to swing therewith across a scale (not shown)
provided on the supporting plate 86 that is calibrated in
units of volume. Spring 74 continuously biases pusher
element 78 against the adjustable stop 8t) although the
action of the nutating plate assembly 60 through the drive
mechanism 38 is su?icient to overcome the action of the
spring whenever gas is ?owing through main conduit 14
and conduit 16 to place the fluid-operated clutch into
engagement.
In operation, pointer 9t? is ?rst set to the point on the
scale carried by plate 556 which indicates the desired
28 at one end and the other end thereof is mounted for 55 volume of gas to be delivered during each cycle. This
pivotal movement about the axis of rotation of shaft 30.
action, of course, sets stop 8%? in adjusted angular rela
Intermediate the ends of the rocker arm 26, a stub shaft
tion to push-rod $2 and determines the sweep of pusher
32 is carried upon which are mounted for conjoint rota
element ‘78 needed to close the bistable valve assembly.
With the bistable valve assembly closed, compression
been designated broadly by numeral 38 and which, in the 60 spring 24 of the fluid-actuated clutch assembly 313 is
particular form shown, comprises a gear train although
effective to retract the piston 22 thereof thus disengaging
it could quite obviously constitute friction rollers or the
elements 3-6 and 44 of the drive mechanism so that spring
tion, elements 34 and 36 of the drive mechanism that has
latter in combination with a belt and pulley arrangement
or some other equivalent power transmission system.
Shaft 30 is mounted for rotation on a suitable support 46.
and carries on one- end thereof drive element 42 of the
gear train that, forms a permanent driving connection with
element 34 thereof. Element 36, on the other hand,
provides only an intermittent driving connection with
'74 can freely bias the pusher element 73 into engagement
with the stop 8%. Then, immediately upon the receipt
of an actuating impulse of a character adapted to open
the bistable valve assembly, gas under pressure enters
conduits 14 and 16 simultaneously actuating the ?uid
operated clutch mechanism 18 to engage elements 36
and 4-4 of the drive assembly 38 and nutating plate mech
driven element 44 of the gear train which is mounted on 70 anism 649 to drive the latter. As the ?uid ?ows past the
shaft 46 for rotation therewith between supports 48
and 50.
nutating plate, it functions through the drive mechanism
Also mounted on shaft 30 is an arm or kicker 52 that
to turn pusher-element away from the stop 89 in the
direction of the arrow in FIGURE 2 until said pusher
is, engaged by the stem 54 that projects from the spherical
hub 56 of nutating-plate 58 placed in the path of the gas
element contacts the push-rod 82 (dotted line position of
FIGURE 2) closing the bistable valve assembly once
3,067,760
delivered through conduit 68.
6
plate into the stable open position of FIGURE 4 wherein
the inlet of conduit 120 that opens into the spool valve
casing 96 is uncovered thus admitting gas to cylinder 122.
again. In the meantime, spring 74 has been wound more
tightly and a pre-determined volume of gas has been
As soon as the bistable
valve is moved into closed position, the ?uid-pressure
behind piston 22 of the clutch mechanism is bled from
the cylinder 20 to the atmosphere through port 92 thus
again disengaging elements 36 and 44 of the drive mech
anism and permitting spring 74 to reset the pusher ele
The ?uid pressure in this cylinder causes piston 124
when used in combination with a bistable valve, is effec
gas enter the system.
to retract in opposition to the action of compression spring
126 biasing the latter into extended position. Now, as
long as the spool remains open and the ?uid continues
to ?ow, piston 124 will remain retracted although gas is
continuously being bled from ahead of the piston through
ment 78 against the stop 00 preparatory to receiving an
10 line 128 and exhaust ports 130 in needle valve housing
other initiating impulse.
132 at a rate controlled by adjustable needle valve 134
From the foregoing, it should be apparent that the
which is substantially slower than the rate at which the
volume-controlled actuator of the present invention,
tive to deliver an accurately predetermined quantity of
gas on an intermittent basis.
The automatic reset fea
As soon as the spool is shifted to
the stable closed position of FIGURE 5, however, the
15 supply of gas to cylinder 122 is cut off and piston 124
ture assures the fact that each quantity of gas delivered
will be independent of that dispensed during a prior or
subsequent operating cycle thus eliminating the errors
inherent in an additive system. Also, the positive me
chanical linkage between the nutating plate and pusher 20
extends under the in?uence of spring 126 as gas is slowly
bled off ahead of said piston past the needle valve. As
the piston approaches its fully extended position, an ex
ternally-located member 136 carried on the piston rod
138 contacts one end of a rocker arm 140 pivotally
element makes it possible rto control the quantity of gas
mounted within the main valve body 142 in position to
delivered during each cycle of operation with consider
able precision. Up to the present, the instant valve
thus automatically initiating the next cycle by pulling the
engage plate 110 and move the latter off of its seat 114
spool to the left and admitting ?uid to passage 106. Or
ordination with any bistable valve; however, when used 25 dinarily, when the above-described valve assembly is
used as a part of a respiratory device, the rate at which
for certain applications, particularly as a control system
the gas is bled past the needle valve 134 is selected such
for respiratory equipment, it is desirable to supplement
that the system automatically cycles at a slower interval
the actuator with a pressure-responsive type of bistable
actuator has been described as it would function in co
valve assembly connected thereto in a manner to over
than the patient’s natural breathing cycle. Thus, the
reference will now be made.
ful in breathing patient’s recovering from anaesthesia
ride the volume-controlled function whenever the pres 30 system will normally be triggered by the natural inspira
tory efforts of the patient lowering the pressure in cham
sure in the system exceeds a preset value. A bistable
ber 108 rather than automatically by means of the auto
valve assembly of the aforesaid pressure-responsive type
matic system 118 above-described. This is especially use
has been illustrated in FIGURES 1, 4 and 5 to which
The basic bistable valve assembly 10‘ shown used with
the actuator mechanism 12 is that which forms the sub
ject matter of US. Patent 2,881,757 although it has been
modi?ed slightly to accommodate and cooperate with
the actuator and has been illustrated schematically for
the purposes of simplicity.
The inlet conduit 94 is con
nected to receive gas under pressure from a suitable
source thereof (not shown) and deliver same to the
interior of spool valve housing 96 wherein lies spool 98
that is stable in both the closed position of FIGURE 5
and the open position of FIGURE 4. Assume for the
moment that spool 98 is closed as in FIGURE 5 pre
paratory to receiving an impulse of a character adapted
to open same initiating the operating cycle. Such an
as they are able to override the automatic cycle feature as
soon as they are able to initiate an inspiratory response
thus substantially reducing the recovery time.
Valve assembly 10 is pressure-responsive and capable
of overriding the volume-controlled actuator therefor
whenever the ?uid pressure in chamber 112 equals or
exceeds a pre-set value determined by the position of ad
justable spring abutment 144 in internally-threaded col
lar 146 of main valve casing 142.
As the ?uid pressure
within chamber 112 rises, diaphragm 104 will shift from
the position shown in FIGURES 1 and 5 to the extended
position of FIGURE 4 carrying with it the hollow hub 102
that is attached by means of a lost-motion connection to
the projecting stem 148 of spool 98.
Plate 110 is mount
ed on a section of reduced diameter 150 at the opposite
plunger 100 which acts through the hub 102 of dia 50 end of the spool 98 which also carries a compression
initiating impulse can be impressed manually by pushing
phragm 104 to engage the end of spool 98 moving the
latter to the left so as to uncover the inlet to gas passage
106 as in FIGURE 1.
A second method of initiating
the operating cycle is to lower the pressure in chamber
103 at the left of disk 110 by sucking gas through deliv
ery conduit 14 as. would be the case if a patient were
connected to receive gas from tube 63 downstream of the
spring 152 biasing said plate against shoulder 154 thus
providing a yieldable mounting.
Now, during normal operation of the bistable valve
assembly 10, the spool is shifted into the stable open
position of FIGURE 4 and the ?uid passing between seat
114 and disk or plate 110 forces the latter to the left
against the bias of spring 152 as shown. A further in
crease in pressure within chamber 112, however, will move
the hollow hub 102 and diaphragm 104 supporting the
?uid pressure in the adjoining chamber 112 on the right
side of plate 110 exceeds that in chamber 108, the dif 60 latter more to the right than shown in FIGURE 4 com
pressing spring 156 against adjustable abutment 144 and,
ferential across the plate will lift same off of its seat 114
at the same time, shifting the spool into the closed posi
allowing the gas to pass from passage 106 into venturi
tion of FIGURE 5. Of course, as soon as the spool shifts
116 and into chamber 112 where it passes the plate and
into closed position shutting off passage 106, the ?ow of
enters the delivery conduit from chamber 108. At the
beginning of the cycle, chamber 112 is at ambient pres 65 ?uid past disk 110 stops permitting spring 152 to snap the
latter into place against its seat 114 while exhausting the
sure being open to the atmosphere through port 92 in
?uid within chamber 112 through exhaust port 92 adja
the venturi 116.
cent the venturi. The location of adjustable spring abut
The third method by which the cycle may be initiated
ment 144 within the internally-threaded collar of main
is by means of the automatic cycler that has been indicat
ed broadly by numeral 118. Assume that the valve as 70 valve casing 142 determines the ?uid pressure within
chamber 112 that is required to overcome spring 156 and
sembly 10 has been manually triggered to shift the spool
shift the spool to closed position. Note also that the
and unseat plate 110, whereupon, the gas will begin to
above-described pressure-responsive mechanism is oper
flow into chamber 112 from the venturi and across the
ative to override the automatic cycling assembly 118 which
seat 114. When this takes place, the ?ow of the gaseous
medium will function to shift the spool and associated 75 might conceivably be in the position shown in FIGURE
nutatiug plate and said patient inhaled. Whenever the
1- holding the disk 119 off its seat 114- at the instant the
pressure in chamber 112 actuates diaphragm 1% to shift
the spool into closed position as this would merely hold
the lower edge of said disk to the left against the bias of
spring 152, the ?ow of ?uid having already been shut off.
In conclusion, it will be desirable to mention brie?y the
tion to close the bistable.v valve, when the nutating plate
means is actuated by. ?uid: ?ow ing therethrough, and
‘said power transfer means functioning in disengaged po
exhaust system and the function of venturi 116 in the com
bination already set forth in considerable detail. As is
sition to release, the actuating means for return move
ment into engagement with the stop under the in?uence of
the reset means while freeing the bistable valve for actu
ation into open position, and ?uid-actuated clutch means
normally biased into inoperative position connected to re
Well known in the art relating to the flow of ?uids, the
ceive ?uid from the bistable valve when the latter is
velocity. of the gas increases as it passes through the 10 open, said clutch means being operatively connected to
throat or ori?ce 158 of the venturi 116 creating a local
the power transfer means and adapted upon actuation
ized negative pressure zone adjacent thereto which func
to shift same from disengaged into engaged position.
tions to suck air from the atmosphere in port 92. This
2. The combination as set forth in claim 1 in which the
in?ux of air effectively blocks port 92 and prevents the gas
power transfer means comprises a mechanical train having
in line 16 that feeds cylinder 24B and from being exhausted
at least three elements, the ?rst of. said elements being
therethrough while the bistable valve mechanism is open
connected to receive power for rotating same about a
and ?uid is ?owing into the delivery conduit. The gas
?xed axis directly from the nutating plate means, a sec
pressure in conduit 16 that is used to extend piston 22
ond element of said train carrying the actuating means
also functions to expand in?atable exhaust valve 16% into
for rotational movement therewith about a ?xed axis,
substantially ?uid-tight sealed contact with the exhaust 20 and a third element mounted for rotational movement
branch 162 ofv delivery tube 68 as shown in FIGURE 1.
about a shifting axis responsive to operation of the ?uid
This exhaust branch 1.62 is located downstream of the
actuated clutch means, said third element in the disen
nutating plate assembly at} and must, therefore, be closed
gaged position of the power transfer means being opera
at all times when the ?uid is?owing in the direction of
tively connected to only one. of said ?rst and second ele
the arrow in tube 68 in FIGURE 1; otherwise, the ?uid
ments of the train, and said third element in the engaged
would be vented to the atmosphere before it could be
position of the power transfer means being operatively
used.
connected to both said ?rst and second elements of the
train.
The instant the bistable valve assembly shifts into the
closed position of FIGURE 5 and. ?uid ceases to ?ow
3. The combination as set forth in claim 2 in which the
through‘ passage 106 and the venturi 116, the ?uid pres‘
stop means is mounted for arcuate adjustable movement
sure in line 16 exceeds the ambient pressure due to the
in the path of the actuating means, said stop means co
bias of spring 24 on piston 22 and also the pressure exert
operating with the actuating means to vary the time in
ed by the in?atable valve 169 tending to de?ate same thus
ternal required for the latter to sweep the are between
exhausting the ?uid from line 16 out port 92. When
the stop and the bistable valve thus controlling the volume
valve element 164) de?ates into the condition illustrated 35 of ?uid delivered while the valve is open.
v
in FIGURE 5, it opens the branch exhaust 162 and al-_
4. The combination as set forth in claim 2 in which
lows the gas fed to the patient or other user to escape
the reset means comprises a spring operatively connected
preparatory to initiation of another cycle.
to the second element of the mechanical train biasing the
Having thus described the several useful and novel
actuating means carried thereby against the stop means.
features of the volume-controlled bistable valve actuator 40
5. The combination as set forth in claim 2 in which the
of the present invention and combinations thereof with
nutating plate means comprises a housing connected down
a bistable valve, it will be apparent that the many worth
stream of‘ the bistable valve to receive ?uid therefrom
while objectives for which they were developedhave been
achieved. Although but a single- speci?c embodiment of
the invention has been illustrated and described in connec~
tion withv the accompanying drawings, we realize that
certain changes and modi?cations therein may well occur
to those skilled in the art within the broad teaching here,
of; hence, it is our intention that the scope of protection
afforded hereby shall be limited only insofar as said-lim
itations are expressly set forth in the appended claims.
What is claimed is:
1. In combination in a system for controlling the ?ow
and a nutating plate operativelyiconnected to the ?rst
element of the. mechanical train and mounted for wob
blingmovement within the housing in a‘ direction respon
sive to the ?ow of ?uid therethrough adapted to move the
actuating means, away from the stop means toward the
bistable valve.
6. The combination as set forth in claim 2 in which the
fluid-actuated clutch means comprises a cylinder connected
to receive ?uid downstream of the bistable valve, a piston
mounted for reciprocal movement within the cylinder,
linking means operatively interconnecting the third ele
ment of the mechanical train with the piston and adapted
assembly including a bistable valve having a stable open 55 upon the application of ?uid pressure to the latter to
extend same shifting the power transfer means from disen
and a stable closed position and means responsive to the
of ?uids under pressure on an intermittent basis, a valve
?ow of a predetermined volume of ?uid operative to au
tomatically close the bistable valve, said means compris
ing actuating means operatively associated with the bi
gaged into engaged position, and spring‘means biasing the
piston into retracted position within the cylinder when the
?uid pressure is released therefrom thus returning the
stable valve and adapted upon movement in one direction 60 power transfer, means to disengaged position.
7. The combination as set forth in claim 1 which in
to close the latter, stop means positioned in the path of
cludes a delivery conduit having an exhaust opening
movement of the actuating means and adapted to co
therein connected to receive ?uid from the nutating plate
means and a ?uid-pressure actuated normally open exhaust
the bistable valve remains open, reset means operatively
connected to the actuating means normally biasing the 65 valve connected to receive ?uid downstream of the bistable
operate therewith in controlling the interval during which
latter into engagement with the stop, -1 eans and in a di
rection opposite to that at which it moves to close the
bistable valve, nutating plate means connected to receive
?uid from the bistable valve and respond to the ?ow there
valve, said exhaust valve being operative, in response, to
the application of fluid pressure thereto to close and seal
the exhaust opening.
8. The combination as set forth in claim 7' in which the‘
of to provide a motor, power transfer means having an 70 exhaust valve is connected in. parallel with
engaged and a disengaged position forming a driving
connection between the nutating plate means and the
actuating means, said power transfer means being op
erative in engaged position to overcome the bias of the
reset means and move the actuating means in the direc
actuated clutch means.
the fluid
'
9. The combination as set forth in claim 7 in which the
exhaust valve comprises an in?atable elastic bulb.
10. The combination as set forth in claim 1. in which
75 the bistable valve of the valve assembly comprises a spool
8,067,760
9
valve mounted for reciprocating movement within a
housing therefor having an inlet and at least one outlet,
said spool valve having a portion thereof projecting from
the housing into position to be engaged by the actuating
means which functions upon actuation to shift said spool
H).
iA‘,1
mounted between the axially adjustable abutment means
and the hub portion of the diaphragm, said abutment
means and spring means cooperating to de?ne an adjust
able and yieldable abutment operative to vary the ?uid
pressure required in the pressure chamber to shift the
into its stable closed position wherein the inlet is sealed
spool valve into closed position.
manually-operable spool valve actuator adapted upon
clutch means normally biased into inoperative position
15. The combination as set forth in claim 13 in which
o?’ from the outlet.
the valve assembly includes a venturi connected to receive
11. The combination as set forth in claim 10 in which
?uid from the outlet of the spool valve housing and deliver
the spool valve housing includes a second outlet located
in the opposite side of the ?rst outlet from the inlet, and 10 same to the pressure chamber, said venturi also having a
port therein open to the atmosphere positioned to suck in
in which the valve assembly includes means operative to
air when the spool valve is open.
automatically open the spool valve, said means comprising
16. The combination as set forth in claim 15 in which
a cylinder connected to receive ?uid from the second out
the venturi is also connected to receive ?uid from the ?uid
let of the spool valve housing when the spool valve is
open, a piston mounted for reciprocal movement within 15 actuated clutch means and exhaust same through the port
when the spool valve is closed.
the cylinder, an exhaust conduit connected into the same
17. The subcombination of a ?uid-?ow-driven volume
end of the cylinder in which ?uid is delivered thereto,
controlled valve actuator which comprises stop-forming
a bleed valve connected into the exhaust conduit and
means, actuating means mounted for movement toward
adapted to control the rate at which ?uid is exhausted
therefrom, spring means biasing the piston in a direction 20 and away from the stop, reset means normally biasing the
actuating means into engagement with the stop-forming
to bleed the ?uid delivered to the cylinder out the exhaust
means, nutating plate means responsive to the flow of ?uid
conduit past the bleed valve at a predetermined flow rate
therethrough to provide a motor, power transfer means
while the spool valve is closed, and an actuating lever
having a disengaged and an engaged position forming a
mounted for rockable movement in position to provide
an operative connection between the piston and spool 25 driving connection between the nutating plate means and
the actuating means, said power transfer means being op
valve, said actuating lever being adapted to shift the spool
erative in engaged position to overcome the bias of the
valve from stable closed to stable open position when the
reset means and move the actuating means away from the
spring means biasing the piston has caused a predetermined
stop-forming means when the nutating plate means is op
amount of ?uid contained in the cylinder to be bled
perative, and said power transfer means functioning in dis
> therefrom.
engaged position to release the actuating means for return
12. The combination as set forth in claim 10 in which
movement into engagement with the stop-forming means
the valve assembly includes a hollow valve casing con
under the in?uence of the reset means, and ?uid actuated
taining the spool valve housing and spool valve, and a
actuation to shift the spool valve from stable closed into
stable open position, said spool valve actuator comprising
responsive to the application of ?uid thereto to shift the
power transfer means from disengaged into engaged
position.
'
a push-rod mounted for reciprocal movement in the hol
18. The subcombination as set forth in claim 17 in
low valve casing in coaxial relation to the spool valve with
which the power transfer means comprises a mechanical
one end thereof positioned to engage the end of said spool
valve opposite the end thereof engaged by the volume 40 train having at least three elements, the ?rst of said ele
ments being connected to receive power for rotating same
controlled actuating means.
about a ?xed axis directly from the nutating plate means,
13. The combination as set forth in claim 10 in which
a second element of said train carrying the actuating means
the valve assembly includes pressure-responsive means
for rotational movement therewith about a ?xed axis, and
adapted to override the volume-responsive means and
close the spool valve at a pre-determined pressure, said 45 a third element mounted for rotational movement about a
shifting axis responsive to operation of the ?uid-actuated
pressure responsive means comprising a hollow cylin
clutch means, said third element in the disengaged position
drical casing containing the spool valve and housing
of the power transfer means being operatively connected
therefor, said casing having an annular seat encircling the
to only one of said ?rst and second elements of the train,
projecting end portion of the spool valve in substantially
normal relation to its axis of reciprocal movement and 50 and said third element in the engaged position of the power
transfer means being operatively connected to both said
a passage connected to receive ?uid from the outlet of
?rst and second elements of the train.
the spool valve casing and deliver same on the same side
19. The subcombination as set forth in claim 18 in
of said seat, a disk carried by the projecting end portion
which the stop-forming means is mounted for arcuate
of the spool valve for movement therewith, spring means
carried by the projecting ‘end portion of the spool valve 55 adiustable movement in the path of the actuating means,
said stop-forming means cooperating with the actuating
biasing the disk into sealed engagement with the seat when
means to vary the time interval during which the actuating
said spool valve is closed, a ?exible diaphragm mounted
means moves away from said stop means before the ?uid
in the hollow casing at the opposite end of the spool valve
actuated clutch means functions to disengage the power‘
from the disk, hub-forming means carried by the dia
phragm and connected to the adjacent end portion of the 60 transfer means.
20. The subcombination as set forth in claim 18 in
spool valve with a lost-motion coupling, and conduit
which the reset means comprises a spring operatively
means connected into the hollow casing in position to
connected to the second element of the mechanical train
receive ?uid therefrom that has ?owed past the seat and
biasing the actuating means carried thereby against the
deliver it to the nutating plate means, said diaphragm and
disk cooperating with one another and with the hollow 65 stop-forming means.
21. The subcombination as set forth in claim 18 in
valve casing to de?ne a pressure chamber, said diaphragm
which the nutating plate means comprises a housing con
being operative when the spool valve is open and ?uid is
nectable to receive ?uid under pressure from a source
?owing from the chamber past the unseated disk to shift
thereof on an intermittent basis and a nutating plate op
said spool valve into closed position when the ?uid pres
70 eratively connected to the ?rst element of the mechanical
sure in said chamber reaches a pre-determined level.
train and mounted for wobbling movement within the
14. The combination as set forth in claim 13 in which
housing in a direction responsive to the ?ow of ?uid
abutment means adjustable along the axis of reciprocal
therethrough adapted to move the actuating means away
movement of the spool valve is carried by the hollow valve
from the stop means.
casing at the end thereof in which the diaphragm is
22. The subcombination as set forth in claim 18 in
mounted, and means comprising a compression spring is 75
3,067,760
11
which the ?uid-actuated clutch means cmnprises a_ eylinder.
connectable to receive ?uid from a source thereof ‘on an
12
means biasing the pistonintq
a‘eyted position withinrthe
cylinder when the ?uidpress jeis 'eleased therefrom thus,
intermittent basis, a piston mounted for reciprocal move
returning the power trarfsf“ ‘means to disengaged position.
ment within the cylinder, linking means operativ‘ely inter
References Cited in the ?le-of this patent
connecting the third element of the mechanical train with 5
UNITED STATES PATENTS
the piston and adapted upon the application of fluid pres—
sure to the latter to extend same shifting the power transfer
means from disengaged intO engaged position, and spring
2,082,788
2,310,978
Brayer _______________ __ June: 8;, 1,9,3?
McGili ______________ __ Feb. 16,1943
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