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Патент USA US2408365

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Oct. l, 1946.
E. s.l L. BEALE
2,408,362 .
Filed NOV. 17, 1943
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Oct. 1, 1946.
E. s. L. BEALE
Filed NOV` 17, 1943
4 Sheets-Sheet 2
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Evelqn S‘hwar* lomsdomhe. (Segu,
Oct. 1, 1946.
E. s. g.. BEALE
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Filed No‘v. 17, 1945
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4 Sheets-Sheet 3
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Oct.' l, 1946.
E. s.. l.. BEALE -
2,408,362 A
Filed NOV. 17. 1943 y
4 Sheets-Sheet 4
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‘2.2. AT'roRNEY».
Patented Oct. l, 1946
Evelyn Stewart Lansdowne Beale, Staines, Eng
land, assignor to Alan Muntz & Company Lim
ited, Hounslow, England, a companyY of Great
Application' November 17, 1943, Serial No. 510,638
In Great Britain November 25, 1942
15 claims. (ci. iso-_97) .
2 .
said intendedphase relationship. “Synchronous
ly” herein means during like portions of successive
cycles of the oscillating machine concerned.
_This invention relates to oscillating fluid-dis
placing machines arranged to operate in parallel
on a common mamas either pumps or motors,
According to this invention in a. further aspect,
,and liable to variation in the phase-relationship
of their respective oscillating duid-displacing
4a combination of at least three oscillating iluid
displacing machines arranged to operate in par
«The invention is concerned especially, but not
allel on a common main is provided with means
exclusively, with Vinternal-combustion-operated
fory maintaining automatically a predetermined
air-compressors and .motive gas generators of the
free-piston type, in which the oscillating element
phase-relationship between them, said means in
cluding a source of fluid under pressure, a device
rincludesa power piston and a compressor piston
arranged to reciprocate in unisony and uncon
a master for interrupting the flow of said pres
actuated by one of said machines which serves as '
surefluid synchronously only once per cycle of,
said master machine, two devices actuated re
spectively by the other two of said machines
strained `by any continuously-rotatable crank
` shaft, so that the period of reciprocation depends
on vthe inertia of the free-piston assembly, the
>gas pressures acting on it, and the restraint due
which serve as slaves, said two slave devices being
connected to receive in parallel the interrupted
flow of pressure fluid passed by said master device
for interrupting the flow of pressure ñuid syn
chronously only orrce per cycle of the respective
to friction and the driving» of accessories.
When oscillating fluid-displacing machines are
.delivering ñuid to-or drawing fluid from a com
mon main iny parallel, the magnitude of the fluid
slave machines, the arrangement being such that
there- is normally an overlap of the non-inter
rupting period ofl said master device with the
non-interrupting period ofeach of said slave de
vices, and two controllers for varying the periods
'of oscillation of therespective slave machines,
pulsations in the main depends upon the phase
relationship of the4 several machines, and it is
y usuallyrdesirable to maintain such a phase-rela
tionship that the duid-pulsations inthe main are
-minimised.. An object of this invention is to pro
vide means for automatically controlling both the
magnitude and the'sign of the relative phase dis
placement of two such parallel-operating ma
_said controllers vbeing responsive to the mean rate
of flow of pressure fluidy passed by said slave de
vices respectively and being so set that one of
` chine'sf A further object isto provide improved
means for automatically controlling the phase
relationship of three or more'such parallel-oper
` ating machines. .
According to this . invention a combination of
_at least> two oscillating fluid-displacingV machines
arranged to’operatein parallel on a. common main
is provided with means for maintaining automati
cally a` predetermined >phase relationship ybetween
them increases, while the other decreases, the
period of oscillation of its associated slave Ina
'chine in> response to an increase in the flow of
`pressure fluid passed by its associated slave device.
.'I'hus, where three oscillating machines are
combined to> operate in parallel, each of said three
‘devices maybe so arranged that its non-inter
rupting period occurs over one .of the dead points
them',~said means includinga source of fluid under
'of the oscillating elements.
Where it is desired that any of said devices
pressure„a_ device actuated by one of said ma
chines which servesas a master for interrupting 40 shall .be oscillatory and that the non-interrupting .
period of said oscillatory device shall occur in
the flow of said pressure fluid synchronously Aonly
~once per cycle of saidimaster machine, a deviceV4 vcourse of the displacement of the oscillating ele-V
actuated by the other of said two machines which
ment between its, dead points, the saidrdevice
’ maybe provided .with a disabling element adapted
3 acts as a slave, saidslave device being connected
to receive the interruptedflow -of pressure fluid
passed by said master device and serving for in
to maintain it in interrupting condition during '
alternate strokes,
lterrupting the ,flowfof pressure vfluid synchro
nously `only once per cycle ofsaid slave machine,
v “fluid underpreSSure” or “pressure fluid,” means
' mally an overlap of the non-interrupting periods
a liquid, electricity or a gas. ,
rofsaid .two devices, and a, Vcontroller for` varying
rv"Where" the pressure ñuidis a liquid', forex
ample oil, the interruptingdevices -are hydraulic.
`-the'p'eriod of oscillation of said kslave machine, in
response to variation in the mean rate of flowof
,_ The master valve _Íinay have a plurality of sepa
'i pressúrefilùid'passedlby said two devices in series,
@mais departure' from
e. `_either the instrokes or> the
’_“Tli'e 'word “iluidg” herein referred to as being
thearrangement being such that there is> nor
sich.. a ense _as
,rate pórts „arrangedto'feed'different 'slave valvesy ‘ i
respectivelyv;, alternativelypthe.master valve may
The proportions are such that, during any one
working cycle, the maximum air pressure and the
through a common valve port, the ducts connect
ing this common port to the respective slave
valves containing non-_return valves.
and return energy to them during their in-strokes.
be arranged to feed a plurality of slave valves
minimum air pressure in the cushions respectively
‘exceeds 'and'is less than the :air pressure in the
'scaven'ge 'air receiver "I'5, Awhich vis substantially
equal to the delivery pressure of the motive gas
lïlïhercï‘thel oscillating machines are` of the :tree
piston ityp'e, 'the floweinterruptin’g *devices v‘are
conveniently arranged to oscillate with amplitudes
_ ‘in the receiver I8.
dependent on the stroke of the associated free--y
The air content of the cush
ions canlbeìvar-iedby a control valve 2I, adapted
piston machines, so that these amplitudes «var-y
in dependence on the operatingjconditionsfofithe 5W.C.
machines; and in this case compensating means
may be provided for reducingoreli'minating:the
-fwhenrinitherneutral position shown to seal a bal
ance pipe 22 connecting the two cushions. The
»Valve 2'I, ‘when -move'd to the left of the neutral
rupting period to the period'o‘f os'óillation'conse
’with‘the'scavengezair receiver I5 through a non
quent on variation in the operating conditions.
Each of the controllersìfor’veïryii‘githejperioö.
of oscillation of the slave machines i'niaìyiin'clude
a differential fluid pressure-responsive deviceboth
sides of which are connected to said‘söurce ‘of
fluid pressure.
return valve ’23 which allows air to pass only from
. ithe’cushi'onsitofthexreceiver, which will occur dur
» 5mg 'ìthat îpart or" each cycle when the cushion
<pressure. exceeds the receiver pressure. When the
"valve'ïi is moved to the right from its neutral
NJ O position, it connects the cushions to the receiver
' JEmlo‘odim'errts‘ 'of Athe ¿invention `as applied to a
'grou'p’o‘f 'free-piston"gas‘generat'ors >'will Q¿he de
scrib‘e'd ~loy 'way 'of >erzarnple'with lreference lvto the
"accompanying ~diagrammatic < drawings, uin which
only those Àparts "of Lthe 'control 'mechanism with
which'this'invention'isconcernied -=are shown. In
"the drawings:
position, lputs lthe ¿cushions into communication
‘i5 "throughea ‘non-return valve-'21H lvv'l'ii’ch ‘allows
'airJ to‘pa‘ss` only ‘from the 'receiver l'tolthe'cushions
Ywhich Willpccur during that partei -e'achcycl'e
»when fthe *cushion pressure Ais >Alower than the ‘re
.f lceiver vpressure. In >Y`such a ’gas-‘generator the
periodic time of a cycle can be reduced Lby in
Icreasing »the "quantity V'o’iî ~-air contained 'in the
l’Fi‘g. :'l ’shows in section‘a "group‘o'f `three gaï's«
~g‘eri'era’t‘ors‘arranged to loperate in‘p'a‘ra'llel,
»- cushions. Consequently movement of the'valve
_ Fig. 2 >isa di'agra’m‘illustrating’theoperation of
“ ally-reduce « and víincrease“'re‘sp’e‘ctively V‘the " cyclical
lFig. '3 ‘shows îin ’section -a ‘ 'group of 'ï-ñve 1gas
__ îFig's'B “anu v6‘show'nio'clifi‘cationsof parts o'f
__ ' Fig.’îïshows‘part'oïvan' arrangement' equivalent
tot that shownk in“ Fig." 3,> and
' ¿ïir'igja is’ai‘sectron of aîdetaii‘ofrig. '1.
, `In kkth'e "examples herein V`'to 'be >described with
referencek to'Figs. 1"t`o"6v the‘pha'se control system
fis hy'dr'aulioßthe Ípr'es'sure’ñui‘d employed’loeing
ò'il. ’ Figs. " ’î and "B 'show
sem‘oliespí the ’master 'gas-'generator M operate
'shown dia
grammatically íals'a piston -v'alve -the piston óf
f 4whic'nis V'fonneii’on a‘tail‘rod 225 :offene of th'e
'o’fftlie'group'shown in Fig.‘3_,_
speed of Àthe »gas-generator. IThe 7free-'piston -as
’synchronously "a 'hydra'iiiic Uvalve
Fig. “4 vis : a _diagram "illustrating the 'operation
'2l to “the 3'left l*and "right l‘respe'ctively will 'gradu
analogous “electrica-l
free-'piston assemblies. This vvalvehas two'simi
lar sets'o'i'portsäßl and’262 operating'in'parallel
‘and *arranged ito ‘remainlopen ltiming v'a part of
Aeach Y'cycle when the free-pistons ‘are approach
ing, A'passing àthrough “and Vreceding from >their
'innen dead "póintîandîtoJ‘rem'ain-closed 1during ' the
‘rest of 'thercycie‘including:the ‘outer dead point.
'The‘slavegas-:generatorsfïs I ~and'SZ are' provided
`with¿hydraulic LvalvesVV‘I îand V2 similar to the
>'."sy'fstem 'wherein' switches; résistances 'and vv.electro
‘vai-ve ìVM, V'except :that each i has only lone set >of
ports. ZThettw‘o‘setsj‘oi‘rports 261 vand V262 of the
jf the :piston valves, "restricted princes ' and ‘fluid
"master valve’lV-Mcontrol lrespectively¿the now of
«pre'ssur-eèresponsiv'e îadevi‘ces ’of V"the v"hydraulic
‘In Ting. '1" 'the 'master 'gas-generators denoted
cillin> two "pipes :2211 *and ¿212 l*which branch ‘irom'fa
"source "àä‘Aof oil `at_constant pressure. The vtwo
magnetic devices ’talie fth‘e Èplac'es respectively Y_of
‘branches "2?'1 "an’d ’212' are 'also ‘controlled respec
"tively ‘by't'h‘e twoslave‘valves VI 'and'VL >Each
branch includes a metering orifice ’313.
'The Lbranch 271 terminates .in ‘a 'cylinder /3I1
j'c‘ont'aining ‘a îpiïston “.321v loaded 'by a :spring 331.
“ ‘The ‘piston/B21 "is "connected l"t'o "the ’cushion "air
it "causes'th'e îspee‘d “ôf‘tlie “gas-'generator SI to
increase, 'while the foil 'pressure iin ’ the cylinder
f3! 1 u'r'ges‘tlie> v‘alvefï I'1‘ in "the 'opposite direction.
"The 'cylinder “3(1' cörnmlmi'cates‘wi'th ‘an ' air-col
' ‘anni chamiäer‘mll ."and'with' 'a' leakage V'orifice 351.
"The >'liranél'i[71?‘12"te'rrni'n'ei‘tes 'in a 'cylinder 312
"containing “a piston‘322 ' connected "'to' the 'cushion
‘one ‘of‘th‘e ‘pöwer“pi`stons ‘ l2, open’dire‘ctl'y into
_ 'a‘ir ‘control ‘valve‘“2"I 2 'of îthe 'slave 'gas-'generator
the power cylinder. Exhaustports I6,`c`ontrolled
'The pistonvâizfis,j loaded b'y'a spring‘3'321which
jb`y "the other' power‘pi'ston, communicate 'by an
'fbiases‘th'e 'valv’eiz f2‘towa'rds 'the ‘position in which
"exhaust ‘pipe 'I"I “with a ln‘otive îgas Jreceiver >'|23
common to all three îg'asfgenera'tors‘and ‘supply
v it ‘.causesî'the‘sp'eed 'of the gasfgenera'tor "S2 'to
`ing`for example' a' gas“ turbine.
ï‘r‘li‘e' cham'loersV at I'the Youter ~'ends‘of the‘com
"decrease, »while'theÍóilpressure'in the cylinder
“552 urges the 'v-alve'ZI"2 inîthe l'opposite direction.
'The'.cylinde'r ‘3 f2 communicates with an air-col
'presser cylinders serve "as pneurriati‘c` energy ' a'c
`î1rnn "chaniiloe'r L$3112"eìn'dfwith a‘leaka'ge 'ori'ñce 352.
'cii'mulators (hereinafter called "‘cushions”)"^which
"The‘irequencyeregùlating' means 'of the slave gas
*store energy"during'thepútïstrokes of'thepisto'ns'ï' 75 “ generator 'SZ‘ 'are‘thus arranged to operate' in the
opposite sense to the frequency-regulating mea
of the slave gas-generator‘Slj.
and 402 branch from a pipe 40 connected Vto the
source '26A ofl oil under constant'pre'ssure and
ïTheoperation of- this plantv will be described
tangles 'the period during which the valves VM,
lead to the cylinders 381 and 382 so as to admit
oil Vwhich urges ythe pistons 311 and 312 in such
a direction -as to' decrease ythe area of the leak
age orifices 351 and 352. .The tail rods 251 and
252 are provided with piston valve chambers 60-1
and 602 which, while the free pistons of the as#
VI: and V2 are closed, the» length of the time base
sociated gas-generator are passing through their
with reference to Fig; V2, which shows, on a base
of time, inthe uppery part of the figure the dis
placements of the `free-pistons of ‘the’ gas-‘gen
erators, and inthe lower part, bythe shaded rec
being exactly the periodic~time of the l cycle. 10 outer dead point, open `valves ports 6l1 and 6|2
Whenthe three gas-generators are running at
controlling the pipes 401 and v402, the opening
constantcyclical speed, witha phase displace
period increasing as the outer dead point in
ment -of one-third of a cycle »as shown, which ’
creases (i. e. recedes from the middle of the gas
generator). Meteringoriñces 621 and 622 arear
_condition vmay beinitially established by man
ual control, the period during 'which theY master 15 ranged in series with the valve ports 6|1 and6|2
respectively. Pipes 631 and 632 branch from the
valve VM is open overlaps by the equal intervals
pipes 401 and 402 downstream of the valve‘ports
and metering orifices just described and lead
directly torestricted leakage oriñces 641 and 642
capacities of the orifices130, 351 and 352 are so
selected, in relation to the pressures exerted by 20 andalso through metering oriñces 651 and 652
to valve ports i 661 andV 662 forming. additional
the'springs 331.and 332 and to the ratio of the
leakage paths and controlled by the pistonvalve
intervals trand tz to the periodic time of. the
chambers 601 and 602 in such a manner vthatfthe
cycle, that the quantity of oil that flows into
additional leakage paths are open while the free
each of the cylinders 3I1`and 3I2 during onersuch
interval is I.sufiìcient to-replace the quantityrthat 25 pistons of the associated gas-generators. are
passing through their inner dead point, the open
escapes' >through the leakage orifices 351. and Y'352
ing perioddecreasing as the inner dead point in
during one’complete cycle. The air columns 341
creases` (i. e. recedes from the middle of the gas~
and 342 compensate for the 'pulsating admission
¿of oil so that the‘pistons V321l and 322 remain sub
i The effect on.A the opening period of the >slave
stantially stationary, their' mean positions being
valve Vl or V2 of achange in inner dead point
is not the same as that of the same.l change in
vv»Now fif the 'slave gas-generator S2, which' is
outer deadv point, and furthermore the effect of
leadingthe mastergas-generator M by one-third
a change in inner dead point is different accord
Vof‘a cycle -in phase, tends to Vrun-forl example
slow,`v` the interval of overlap .t2 between the nolL 435 ing to the nature of the change in the operating
conditions of the gas-generator. The leakage
>interrupting periods of its valveV V2 and the
oriñces 641 and 642 are of such a capacity as to
master valve VM increases, yand the 'resulting in
provide the best compromise for `the inner'dead
fcreased admission of pressure oil to the cylin
der 3I2 causes the valve ‘2|2 to befmoved to the
t1 and tz the periods during vwhich the slave
valves VI and V2 are open respectively.l The flow
¿right so that the gas-¿generator S2 .is speeded
up. yIf theV slave gas-generator Sl, which is lag
ging the masterY gas-generator'by onethi-rd 'of a y
'Cycle inv phase, 'tends‘torun' for example slow,
the valve 'overlap interval: t1 decreases, and. Vthe
to thel right sothat the gas-'generator Si _is speed
" «'Í'Asregulationìof the'power output or delivery
its free pistonsfif ythe oil pressure line control
`of five gas-generators M, Sl, S2, S3 and S4 sini
ilar tothe gas-generators shown in Fig. 1. Like
`parts ‘in thes two iigures are denoted by the same
allyvsimilar in arrangement, except for the fol
lowing . differences.>
f ~ The master valve VM’.r has only one set of portsÍ
non-return valve 29 permitting oiltov flow only
in the direction from the master valve towards
.the slave valve and serving to prevent any ilow ,
,rofioil between the cylinders 3|1, 3l2 etc. during
,intervals-.of overlap of the non-interrupting pe.
riods of the slave valves.
Furthermore, the master `and slave piston 'Y
valves» VM'QVI’, V2",` V3’v and V4’. which move
vvalve is operated, as in the example ‘shown in
fFigpl, by’a'member moving' proportionally to
the'fdisplacement of the free pistons, the `ratio-iol?
'the valve overlap interval tothe duration of a
cycle -Will -vary with variation» of lload on'they gas'
generator. Insome circumstances, and with a
_ga's-generaton> ï In Fig. V1 is -shown one possible
>compensating arrangement 'which serves to vary
common to all the branches to the slave valves,
and each of these branches is provided with a y
»pressure of any of the gas-generators may cause '
-a'variation of the outer and inner dead points of
fdue'tc regulation of thepower- output yor deliv
ery»` pressure" of the'` gas-generator, can beV kept
fwithin tolerable limits. Neverthelessin other
circumstances, it may be necessary to provide .the
¿phase-controlling mechanism with means «adapt
ved to` compensate forv variation in .load on _the
Fig. 3` shows phase-controlling gear Vfor a group
reference numerals, the two plants being gener.
'resulting decreasedßadmission 1 of pressure oil to
r¿the`cylinder 3l'1 causes the >valve 2| bemoved s
careful choice of ñxedopening positions of the
'valve ports, the irregularity yin phase relationship,
in' synchronism with thefree pistons of the as,
sociated- gas-generators, are arranged .to open
While the free pistons are passing through a part
of their stroke- intermediate between the inner
and outerdead points, and in order- to obviate
the ambiguity in phase that would result if the
valves opened and closed twiceper cycle, they
are *provided with ported disabling sleeves 42.
421, 422, -423 and 424 which are ñtted between the
valve’ pistonand-the valvebody and which lmask
theports during alternate strokes. These sleeves
îare drivenby collars 43 and 44 on the valve pis
theratio of the-eiïectiveareas of ¿the‘metering
-oriñce 30 and the'leakage'nriñce 351 or 352. i, The 70 tons .arranged to «provide the appropriate degree
'areas `Aof vthe leakage orifices/are icontrolled by
îneedles 361 and 362 rigid with pistonsy 311Y `and
Y1312 whichïwork in cylinders 381Land382 and are
4l`>ia_.sed'bry‘ï"springs 391 and 392 inîsuch adirec
¿tión » as ‘to’ ¿increaseï the leakage; area.` I,Pipes v461
,of backlash.
In the present example the- durationof the
Youtstrokeof- rthe freeV pistons is about three#
guarters vo_f that ‘of their irl-stroke, -and the four
_slaveçgas-_generators are karranged to lead the
master gas-generator respectively by phase dis
placements which increase by equal increments
from gas-generator S4 `to gas-generator SI, as
shown in the upper part of Fig- 4 .whichfshows
on a base of time, the displacements ofthe free
pistons. The valves VM', Vl' and V4' are ar
ranged to be masked on the out-strokes, while
the valves V2’ and V3’ are masked on the in
strokes, The lower part ofV Fig. 4 shows' by the
shaded rectangles the times during which the
valves are closed, the dotted horizontal lines de
noting the times during which the valve ports
means; a simple» but approximate compensation
for such ports is todisplace each cut-off point
independently by inner andk outer deadfpoint
followers respectively, so as to maintain them at
fixed distances from the dead points.
Fig. 5 shows a compensating mechanism ap
plicable to each of the valves of the plant shown
in Fig. 1. The phasing valve, here denoted by
V, is provided with a ported sleeve ‘15,> the posi
tion of which determines the beginning of the
non-interrupting period. An inner dead point
follower 4.6, of the kind described in application
Serial No. 492,865, ñled June 30, 1943, has a con
The non
necting member 41 the position of which corre
interrupting periods of the individual valves are
shown in the upper part of Fig. 4 where OM de 15 sponds to the inner dead point of the free pistons.
A similar outer dead point follower 48v has a
notesthis period for each of the valves VM', VI'
connecting member 49 the position of which cor
andy V4', O2 the period for the valve V2', and O3
are masked by the disabling sleeves.
that for the valve V3’.
- When the gas-generators are running fat a
responds to the >outer'deadv point of the freepis
tons. One end of a floating lever 55 is pivotally
constant speed with their intended phase rela 20 connected to the connecting member 49 and its
other end is coupled by a link 52 to the con
tionship, the periods of overlap of opening of the
necting member 4l. An intermediate point on
master valve VM' and of the slave valves Vl',
V2', V3' and Vd' are those .denoted by t1, t2, ta and
t4 in Fig. 4. Lagging of the slave gas-generators
Sl and S3 >will cause the periods t1 and t3 to de
crease and consequently the cylinders 3-l1 and
3 I3 are so arranged that a reduction in the quan
thev floating lever is coupled by a link 5l to the
valve sleeve 45. The ratio of the .arms of the
lever 50 above and below the link 5l is so selected
that the opening point of the valve is displaced
in accordance with the weighted mean of the
inner and outer deadv points.
tity of oil supplied to them through the piston
The uuid-pressure-responsive devices that -op
valves causes the pistons 32l and 323 to operate
the cushion control valves 2l1 and 213' in such .3,0 erate the cushion air control valves may be of
the differential type arranged to balance two
a sensexas to speedup the gas-generators SI and
hydraulic pressures, instead of beingv spring con
S3. If, however, the. gas-generators S2 and S4
trolled as in the examples hereinbefore described.
lag, the periods t2 and .te increase, and the cylin
ders 3JI2`and 314 are setto operate oppositely to
Fig. 6 shows a part of _ a plant similar to that
the cylinders 3l1 and 3l3, so that an increase in .35 shown in Fig. l, >except that such a balanced
>the. quantity of o-il supplied to the cylinders 312
and' 3|4 causes the gas-generators S2l and S4 to
be speeded up.
It will thus be apparent that such a combina
system is used, the means for .compensating for
variation in load on the gas-generators are
omitted, and a master» valve VM having lone
set of ports common to both branches 211V and
tion of ñve gas-generators is constituted by two 40 l212 is used, these branches having non-return
Valves 28.» Corresponding parts. in Figs. 1 and -6
groups of three gas-generators each of which
have the same referencenu-merals.
groups is arranged similarly to that shown "in
In Fig. `6 the iiuid-pressure-respensive device
Fig. 1, and which have however a common master
that> operates the cushion air control valve 21,1
gas-generator, thïe non-interrupting . periods of
the slave devices of one group diiîering from the NK Si `of the slave gas-.generator Sl vis a cylinder |311
containing the piston 321, which lis springl bia-sed
non-interrupting periods of the yslave devices of
the other group in such a manner that the phase
`differences of the ñve machines are substantially
to its central positicm.l The vright-hand end :of
this cylinder is supplied with oil in exactly the
same way as the right-hand endv of thecylinder
When it is desired to maintain a substantially 50 311 in- Fig. yl, through the valves VM and VI.
constant phase displacement when the power out
'The left-hand end of the cylinder!! 3.11 is provided
put or the working pressure of a group of >units
with a restricted leakage orifice 55 and is con
is varied, the opening period of the phasing valve
nected by a branch pipe 53, which ycontains a
metering orifice >:511, to a pipe l 2.6 communicating
vwith the source of oil under pressure that snp
plies the lmaster phasing valve- VM. When the
may be varied in laccordance with variation in
the inner dead point or the outer dead point or
both of these points `of the free-piston assembly.
This result may be attained by providing piston.
type phasing "valves with `ported sleeves controlled
by spring-loaded pistons working in cylinders
master and slave machines :are
.in the
correct phase relationship, «the force tending vto
move the piston 321 to the right -due to the
supplied with pressure fluid in the same way Vas 60 oil pressure inthe left-‘hand end of the cylinder
i3 I'1 balances the mean force act-ingl on the right
the cylinders 381 and 382 in Fig. 1. Alternatively
hand face of this piston due to the pressure of
.the oil passed by -the phasing valves VM and
sleeves may beY actuated by a linkage so .arranged
This balanced system ,has the advantage that
that the opening or closing of the phasing ports 65
it is unaffected by .accidental variations in the
occurs at a constant percentage of the free-piston
pressure of the .oil »supplied to the» pipe 26.
stroke. With phasing ports arranged .to vbe open
In ,order to avoid irregularity
operation of
over a dead point, the valve opening or cut-ofi
such hydraulic phase-control mechanisms -due to
point maybe displaced through thel agency for
variation in viscosity' of the ‘Pressure liquid.
a floating lever in accordance with v'the weighted
Awhich is’ conveniently lubricating oil, the Vsaid
mean of the inner and the outer dead points.
metering oriñces and leakage ori-ñces should -be
With phasing ports having an opening period
' so designed that the resistance which they im
lying between the inner and the `outer dead points,
--pose'ito the flow of liquid is substantially pro.
vthe opening or the cut-oir points may be similarly
lthe ported sleeves of the phasing valves'may be
controlled by dead-point followers, and these
displaced lin accordance with Isuitably weighted
portional tothe viscosity of the liquid,fthat
to say,> they should provide-- a streamline ñow
with only small kinetic energy eiîects. rrrI'hus
the metering oriñces and the leakageVv oriiices
will besimilarly affected by changes in viscosity.
„1. 4A icombination of> at least Atwo oscillatory
fluid-displacing. machines arranged to operate
in parallel on -_-a common main and provided with
51 means fori maintaining automatically a predeter
- A large battery of >gas-generators may be con
veniently and simply phasedv in two or more
mined phase relationship between 'them, said
groups of two or fourslave gas-generators. all
meansincluding a source of iiuid under pres
sure, a device actuated byone of said machines
which serves as aV master for interrupting the
the groups having a common master gas-gener
ator. In special cases, it -is'possible to control,
in accordance ywith this invention. the phase
relatio'nships of the master generators of two or
iiow of said pressure iiuid synchronously only
once per cycle >of said master machine, a device
actuated by the other of said -two machines which
acts as a slave, said slave device being connected
to receive the interrupted flow of pressure fluid`
more separate phase-controlled batteries. .
' As -hereinbefore mentioned, an electrical sys
teml may be used inïplace of a hydraulic vsys
tem,v4 and the analogy between the. two will" be 15 passed by said master ,device and serving for
interrupting the: flow of'pressure fluid synchro-Í
illustrated by reference to Figs. '1_ and 8„which
are comparable-with Fig: 3. ` The pipe 26- of
nously only once per cycle of said slave machine-1
the -'arrangement being such that, when said pre-Fig. 3 is‘replaced by a lead‘226 to one terminalV
determined phase relationship exists, -there is an
of a current source, 226A, the other terminal of
which is grounded. The hydraulic -valves VM' 20 overlap between the non-interrupting periods of
and VI’- to V4' are replaced respectively~ by
said two devices, and a> controller for varyingthe
period' of` oscillation of said ,sla-ve machine, in
electrical switches SwM, Swl, etc. operatively
responsetof variation in the meanßrate of flow
connected with vthe free vpistons of the gas'
of pressureñuidpassed by Isaid two vdevices in
Where the gas-generators are, as
series,.in such a sense as to- eliminate departure
shown, ofthe usualv opposed-piston type, each
from-said predetermined “phase relationship; e _
switch is conveniently formed by a ring 80 of
= _2. A- combination _of at least three oscillatory
insulating material fast on the -oscillatory shaft
8| of the vpiston 'synchronising mechanism», each
on a common jmain
Iand providedwith
to operate
ring havingv a conducting segment 82 co-operat
a predeter-`
ing witha pair of brushes 83. The synchronising 30
mined phase` relationship between them, said
mechanism shown in Fig. '1 is of the known
means rincluding: av source ci ñuid under pres-5A
rack-and-pinion'type, so arranged that the maxi
sure, al device actuatedgby oneof- said machines
mum amplitude of oscillation of the shaft 8| is
substantially less than 360°~.
which serves as amaster for _interruptingthe _ñow
of saidpressure fluidsynchronously only once per`
cycle ofsaid master ,maßhineftwo devices, actu
atedfrespectivelybythe other> two ¿of said ma
*The* sleeves 42 vand 421 to 424 of Fig.'--3 are
replaced by _switches 242, 2.421 etc., which are
generally similar to the rotary switches> SwM,
etc., but in which the ring 88A is drivably con
nected to the shaft 8| -by friction disks 84 (Fig.
8) loaded by acompressionv spring 85, and have
chines which act asfslaves, saidftwo slave devices
being connected to¿re_ceive _in vparallel the inter
a range of displacement, which is limited by an
fluid >synchronously Ionly-,once yper »cycle of îthe
respective slave machines, _the arrangement beingv
arm 86 co-operating with _stops 8.1, between the
“on” _and “o ” positions of the segment 88.
rupted ñow of- pressure fluid‘ passed by said mas-ter,- devicev for interrupting. the flowr >of pressure
such that, when said predetermined phase rela
, The branch pipes .211 to 214 of Fig. 3Vare re
lplaced by branch leads 2211` and 2214 respectively, 45'tionship exists, there isan overlap ofthe non
interrupting periods of-said vvmasterfdevice Ywith
each including a rectifier 229 and a resistor 123i),the non-interrupting periods of each of said slave
replacing the non-return valves 29 and the or
devices, and two controllers _for varying vthe
iñces 30 of Fig, ,3; The cylinder and piston
periods of oscillationof the respective slave ma'
devices ofy Fig. 3 actuating the air-transfer valves
211 to 2|4 are replaced by spring-biased electro 50 chines, said controllers being responsive to vari
ation in the mean rate ofjfl'iow'of pressure >fluid ,
magnetic devices energized from the appropriate
branch lead 2211, 2212, etc., _throughzthe appro
priate pair of switches 2421 >and Swl, etc.. vSuch
passed `by> said slave-¿devices respectively and
a'device in its simplest form would be a solenoid
the Yother decreases, fthe period - of - oscillatio?gof
ient to use torque motors, one ofwhich appears
~ iiuid-displacingmachines arranged toV operatein
beine.rv so set-that onefof »thernjincreasesüwhile.
having a spring-loadedv armature adapted to take 55 its associated slavev machines-Kin`~ response .to> an.
rincrease inthe-flow v,of pressure fluid passed-,by
up a position dependentV on the mean .value~ ofl
itsassoci'ated slave„device.;r¿ f
the -unidirectional current passing through its ex
i3. A combination of:l at lleast ,two _oscillatory
citing winding. `In practice it isy morecon'ven
in Fig. '7. The motor is of the direct-current 60 parallel on av common-m'ain'and providedwith
meansfor maintaining automatically .a prede
type and its armature 2321 isy connected between
termined phase- relationship {betweenï them, ‘saidground and the respective branch 1ead2111. Its
:deld winding 89 is separately energised through
a conductor- 90 leading directly to the ungrounded
sideof the current vsource 225A. A resistor n9i
may be shunted across the armature in >order to
reduce sparking at thev contacts of the> rotary
switches. The armature 2321 is coupled by a suit
able transmission, indicated diagrammatically-
means including a source of iluid under pressure,
a devicefactuated .byeone of_said machines which
servesA as. a *master for interrupting the iiow of
s__aid pressure fluid synch_ronouslyV with the oper
ationof said master machine, [a device actuated
by the other of -said two'machines _which acts as
a slave, said slave device being Vconnected to re
at 92, to the transfer valve 2I1'and the biasing-
O ceive the'inter'rupted flow of pressure _ñuid passed
spring 2331.` In practice the Y'efiiciency of the'
' by Vsaid masterdevice' and serving for interrupt:
electromagnetic devices will usually be so l'ow
ing the iiow of pressure'fiuid synchronously with
that, when they operateas generators, their out
put will be negligible;> _thus the rectifiers`229 can’
be omitted.
ther operation 'of said slave machine,v the »non
interruptingiperiod of. each-of -said vdevices occur-ç
75 ringl 'over onlyoneof the deadpointsl of the asso
ciated oscillatory machine, and the arrangement
nate departure; trom:v said» predetermined phase
heingfrsuch that, Whensaidipredetermineii phase
relationship exists; therel isa:
overi'apz liettizeenil
tl-'ieìnon sinterruptirrgf. periodsï oi?A said-itwo' devices;
ñuid-displaeingî. machines arranged YIto: operaterin!
and? au controller: for:
t'liebperioch of csail-.+
lati'on .ofi said‘ïslave: machine;v in@.respm‘iseL-toivarî-1
ation‘. irr-.the' mean rateîofiiiow. ofîpressureffluid;
passed;l by said twoÀ devices; in': serie-ss. irr. such'i a'.
sensei“ as' tofV eliminate departure: from:ì said: pree
4i» A= combination‘zofa aztïl’east threesoscillators?>
ñuidîèdisplacinga machines `:a1-ranged'. toi» operatœim
paralleli ormaà common: main and provided; witin
meansi forl maintaining' automatically a.: prede@
terminedî phase .= relationship f: between». them; saidí
meanssincludingoa'» sourceeof ‘Huid-funden. pressure;
ae device> actuated-ïhy.ì onesofï said'v machines, Wlrlielr`
serves as- a1 master:- fòrfinterruptingì tires now" off
6.=.A.- combination; of: at least; live. oscillatom
parallelf onf a. common» mainz and'. provided; with
mea-ns ior maintaining» automatically'a predeten-A
minedv phase. relationshipf, between; thenne said;
meanssincluding-i a.- source- of. iluid.«u~nderl pressure;l
as_deviee actuatedby onefof. said. machines' which:
lik' serves.- ass. a1- mastern for interrupting@ thef.- ilovev on
pressure fluidi synchronously with'. thas operation
of said masterÉ machines. foiir-h devices-„actuated
respectively> by the otlfiex”.- four oi-.saiclimachines
whichL aotï-as-sslavesi ,said ,ioun deyioesibeing; cone»
nected.-- to.: receive.; dansz of; pressere.:v ñuidi inte-ry»
by f said:
flows f of:
and». fluidi
nonsly»l withethei operation ofi. therespeotiveifslave:
machinesísaìdi fives devices: being»i oscillators/5~ with;
said?" pressure‘» fluid synchronouslyf‘witlr. then-openl
ation` off'sai‘d‘ master`^ machine; .tivo-devices; actua 20: their nonf-interriuptingsperiods occurring in course.
ofi thef4 motion; of theA associ-ated» oscillatory man»
atedê respectively'-v b'y tliel otherttvo-A oi:q saidî mai-1,
chine-C~ betweenïìts dead' points, ‘iives disabling.:v cles.
chinesswhi'ch act`-` as slaves;V saidîtwo'flslaveidèvicesï
ments. associatedewith said rive devicesi respeo--~
being connected‘to- receive' ina parailelïtl‘reúnters»
ruptedi-fiòw 1or"pressureei‘liliêiipassed?bwsaiiiîrxrasa
tively; for; eliminating?. noneinterruptingï. periods;
fluidesynelironeusiyßwith» the operation of-’thei-res
spective-'e slave» maeliihes;l the‘U none-interrupting
that?, when.saidpredetermineœphase:relationship
exists, thererisnn overlap cinnamon-interrupting;
ter" device för'- irit‘erruptingv-tl‘rei flow: off pressure- 25.1“ one alternate «.strokesì-„thefarrangement: beingesuchf
periodssoi .saidmasten deviceiw-ith lth amour-«inten»
rnpti-ngï periodss of„ each of.r saidrslavedevioes; and,
One‘mEStiie dead>pcintsf~-of the= associated oscilla»
toryr machine',- and?' the.’a arrangement? beings such’. 30.." foun'eontrollersfior varying?l the periodse oie: csail-.f-A
lation ofA` the; respective;4 slave; machinesl im re.`v`
that; when\said#predeterminedäpliaserrelationshipï
exists, there#issanßoverlapiofl'the noir-interruptingiV
peribd‘ssofisaid master devioewitirethe'rrondnters»
rupt-iiigf‘period's' »'of‘feaoii* voffsaidïY slavev devices; andL
tivo. controllers;forx varying? tiieï-~period-§ of? ascii»T
spense to a» variation-r
the, mean . ratei ori. flora>> ofq
pressurer fluid passedlbis‘theJ respective..- slaveedef.
vices, a iirst pair of saichoontrollers beingrsofsete
f that theyw increase therperfiods of' oscillatiomof‘
the. associatedv ñrste- pair.r of' said slave, machines.
inrresponseto. increase inlthe flowsmf pressure;
fluid. passedrbyA` ther associated first-pair ofi. saisi
slave. devices~,-..the;second, pair- of.. said contm'llersJ
devices"resp'eetivelìfv andi being1 so .-«se'tî tliaeone-f of?
being soset; that., they. decrease the.. periodsf on
t‘liem’» increases? wliil'ei the-f other decreases;` the?.> 4D. oscillation . of; the , associated-.seconds pair oi», said.
period" of ' oscillationj ofi’ itsî4 associate'd‘l sla-vermaa
slaveí machines,x inl response. toi increase in the;
chii1e~ in» response t"o-- ane increase@
theY iiow.1 off
ofi pressure. fluid. passed-by the- associatedi
pressure-~ iiîiidÍ passed-ï byj its-f associated sì’ave: de
secondpair. ofisaidislave,.and;.the overlap
of.. the. norr-inter-ruptine` per-lodi of.' one: dei/ice. of..
5î A; combi‘nati'orr-~v off at? least; two» oscillatoryf
each .oi'sai'dpairswithithatxoi saidlmasterdevioe.
iiiii'dîà displaciiigsmachiires' arrangedîtovoperateeim
occurring during. lìkestrokes, oi. the` master. and
parallèif‘ orr a'l commonm maine andi provided» with
slave,.whi1e the overlapof. the non-interrupting
means4` forv maintaining automatiizallyf‘a prede@
period of; the. other ’ deviceofï each oi! said pairsJ
termiiied‘" phase` relationshipì Betweem tI'iem'-, saidî
with. thatl of.' said'. master; device.. occurs` di1rin.<,>;»~.l
oppositestrolies oil the master.; andlslave...
a* device actuated ldyfone or`saiìi-‘-maciiines@which“V
7.1.5, combinationi of.V at least three oscillatory»
IluìdèdisplacingD-machines arranged.' to operaterin,
as a'J masten
fluidî syncl'i’ronousii'»I
for"V interrupting`r`v
parallel; on . a common, main and; provided; with
cy‘clèF4 or* said’A master lm'aolii‘ne'; a:i device“ actuated*
means_.fnrn maintaining. automatically. appredeten»
mined- phase. relationship, hetweenthem, said;
a slave, sai’dîslave-deviee beingr comieeteditu‘ ne#K
means includingasource ,oíílitiili‘d'unden pressure,~.
ceive the interrupted flow-fo?-’pressurefliiuiill’passed
a hydraulic. valve actuated'. liy.- one of; said; ma.
said:` mastler‘ device and? serving.`v for“ interrupt
chineswhichfserves as ama'ster. andlliavi'ng; two.
im;z the-fiew‘off pri-assure'-fi'uid’îsyricrhronousiiv-only>
port's. fori` deliveringf, two separate flows. of." saidl
once perscyclef o'f-"said*slave‘maoiiineïV atlleastfo’neí
liquid; each4 interrupted-i synchronouslyI once perl
of said. cievicesflceiì'refy oscillatory; the non-intere
cycle of. said‘î master machine, two.- hydraul'iì"k
ruptingîperiod‘of‘îsaidïoscillatbry device occurring
valvesactuatedirespectivelr, by the other. twofoi.'
in' courseoffthe motion ofthe associated oscilla'
said„macliir1es„whichlactßslslaafes, saiöltwoslave
tory; machine. between-¿its deadp'oints; a'` disabling
valveslbeing conneotedltoleceiyethe interrupted;
element.4 associated with, said"A oscillatory' device
ilowssof.' liquid. deliyeredlliy said. two
tively, ofthe» mastenvalve and’ servinggtointerruptl
fon' maintainîngjit' iminterruptìng, condition dur
the. flow., of. liquid; synchronously; onlyy once; per.ingalter-nateistrokes, .the .arrangementheing such.
cycle» of; the. respective, slave machined. the are.
that?,whenrsaidrpredetermined'phase relationship.
rangement; being solch*I that,L whent said; prede-teri-¢
miriedlplfiase;reiationship‘existsi therefissan over»
ruptingä periods` off;
twœ devices,-x and ai cone
trolleny for@ var-slings.4 ther periods, of' osi-dilationy of:
valve» with thee. nonfinterruptina, periods: où each;
saidfslave macliirieyirr response'fto.~variationfin the'
oiisaidï slava-valves», l.and »twol controllerseforrvarszr,
m'eanlrateeotîfiovwoñfpressuœ ñuidepassednby-"saifrì
lation off'tiieerespectlveeslavermachinesß.said’cone
trollersflieing responsive t'ofv’variatiorrdname-mean
pressurefffiùidl passed kìyfsai‘dîsi'avee
sucia aßsensetas. toselìmií» ' . ing the periods of> oscillation of the
8. A combination of at least three oscillatory
periods of said two valves, a controller for vary
ing 'the period/of oscillation of one of said ma»`
chines which acts as a slave, said controller in
cluding a hydraulic fluid-pressure-responsive de
vice connected to be supplied with liquid by said
duct and through a metering port and to dis
fluid-displacing machines arranged to oprei'aftehin4` ~
charge liquidlthrough` a leakage port, said con
„ ¿slave machines, said controllers being responsive
to variation in the mean rate of flow of pressure
liquid passed by said slave valves respectively, in
such a sense as to eliminate departure from said
predetermined phase relationship.
parallel on a commonmainaandiprovided’ywith’ ' "-troller" acting ‘to eliminateY departure» from ¿said
predetermined phase relationship, and said valve
means v_fm‘gmairitairiïlíigautomatically a vpredeter
1 îx'nirìeiif'ïph'ase "relationship between them, said 10 actuated by said slave machine having an oscil
` 'means including a source of liquid under pressure,
latory'element arranged to-oscillate with an am
a hydraulic valve actuated by one of said ma
plitude varying with variation in the length of
chines which serves as amaster and having a
the free-piston strokes of said slave machine, and
port for delivering a ilow of said liquid inter
means responsive to variation of the ratio of the
rupted synchronously once per cycle of said mas 15 non-interrupting period of the said valve actuated
ter machine, two hydraulic valves actuatedre
by said slave machine to its period of oscillation
spectively by the other two of said machines,
for varying’the ratio of _the ñow capacities of
which act as slaves, said two valves being con
said ports so as to compensate at least in-par't for
nected to receive in parallel the flow of liquid
variation in said free-piston stroke.
' 'i
delivered from said port and serving to interrupt 20
11. A free-piston fluid-displacing machine in-=
the ñow of liquid synchronously only once per
tended for operation in predetermined phase re
cycle of the respective slave machines, the ar
lationship in parallel with other like machines on
rangement being such that, when said predeter
a common main and having a controller for vary
mined phase relationship exists, there is an over
ing the period oi oscillation of its free’pistons,
lap of the non-interrupting periods of said master 25 means for conducting a variable supply of fluid
valve with the non-interrupting periods of each
under pressure for actuatingV said controller, and
of said slave valves, and two controllers for vary
a device having an oscillatory member connected
ing the periods of oscillation of the respective
for movement in synchro-nism with said free pis
slave machines, said controllers being responsive
tons and serving to interrupt synchronously the
to lvariation in the mean rate of flow ofv pressure 30 flow of pressure fluid through said conducting
liquid passed by said slave valves respectively, in
means, and means for adjusting the non-inter
such a sense as to eliminate departure from said
rupting period of said device automatically in
predetermined phase relationship.
response to variation in at least one of the dead
9. A combination of atleast two free-piston
points of said free pistons so as at least to reduce
fluid-displacing machines arranged to operate on 35 rthe effect of variation of the length of the free
a common main and provided with means for
piston stroke on the ratio of said non-interrupt
maintaining automatically a predetermined phase
ing period to the period of oscillation of said free
relationship between them, said means including
a source of ñuid under pressure, a ñuid path
12. A free-piston fluid-displacing machine in
connected with said source and including two 40 tended for operation in predetermined phase re
/ devices arranged in series in said path and actu
lationship in parallel with other like machines on
ated respectively by said machines for interrupt
a common main and having a controller for vary
ing the ilow of pressure ñuid in said path syn
ing the period of oscillation of its free pistons,
chronously with the operation of said machines
said controller including a hydraulic actuating
respectively, the arrangement being such that,
device responsive to variation in mean rate of
when said predetermined phase relationship
flow of liquid thereto, a duct for admitting liquid
exists, there is an overlap between the non-inter
to said actuating device and including a valve
rupting periods of said two devices, a controller
having an oscillatory member connected for
for varying the period of oscillation of one of said
movement in synchronism with said free pistons,
machines, in response to variation in the mean 50 and means for adjusting the non-interrupting
rate of iiow of pressure ñuid along said path, in
period of said valve automatically in response to
such a sense as to eliminate departure from said
variation in at least one of the dead points of said
predetermined phase relationship, said devices
having oscillatory elements arranged to oscillate
free pistons so as at least to reduce the effect of
variation of the length of the free-piston stroke
with amplitudes varying with variation in the 55 on the ratio of said non-interrupting period to
length of the free-piston strokes of said machines,
the period of oscillation of said free pistons.
and meansv for at least reducing automatically
13. A combination of at least two oscillatory
the eil'ect of variation of the ratio of the non
fluid-displacing machines arranged to operate in
interrupting period of each of said devices to its
parallel on a common main and provided with
period of oscillation consequent on variation in
means for maintaining automatically a prede
the free-piston stroke of the associated machine.
termined phase relationship between them, said
10. A combination of at least two free-piston
means including a source of fluid under pressure,
fluid-displacing machines arranged to operate on
a device actuated by one of said machines which
a common main andprovided with means for
maintaining automatically a predetermined phase
relationship between them, said means including
serves as a master for interrupting the ñow of said
pressure fluid synchronously only once per cycle
of said master machine, a device actuated by the
a source of liquid under pressure, a >duct con
other of said two machines which acts as a slave,
nected with said source and including two hy
said slave device being connected to receive the
draulie valves arranged in series in said duct and
interrupted flow of pressure fluid passed by said
actuated respectively by said machines for inter 70 master device and serving for interrupting the
rupting the flow of liquid in said duct synchro
flow of pressure fluid synchronously only once per
nously with the operation of said machines re
cycle of said slave machine, the arrangement
spectively, the arrangement being such that, when
said predetermined phase relationship exists,
being such that, when said predetermined phase
relationship exists, there is an overlap between
there is an overlap between the non-interrupting 75 the non-interrupting periods of said two devices,
andçaïcontroilerï-ferß varyingy thefper-icd ci. oscilla.m
tiem cf'; saidzslave machine;X inïrespnnse tofva-riaf
thmugin a leakage;- port; .Y while; the.: other-` side.; oi.
saidzdeviceïis» connected tabel-suppliedfwithiliquidé
from; said, sourcef through . a meteringA port inde'
tion ine ti'iegmeanA rate’. of .flow oi pressure iiuid.
pendently of said.I ductl andfto: discharge liquid.
passedîf; by said. two: devices: in. series;_ in such a.
sensefas zt'o: eliminate. departure from .said-prede» Ul through a leakage~ pcrt,.„said<controller being; set
terminedà phaseJ relationship;. Said.; controller ‘ inf
cludin‘gg. a, differential fluidepressureeresponsive.
actuating* device». both» sidess. of Whichf. are.` cnn»
to.. eliminate departure from said; predetermined
phase -relationship.;,
15. AtV least». two:internal?ccmbustion-foperated;
gasegenerators; of.` the free-piston> type; connected.
14..~ ,A1, combination , of. at;` least 1 two ~free-piston 10 to fdeliver gas tofa-y common-main', in"Y combination»
With» means for.A maintaining; them. in. predeterf
fluid-displacing, machines arranged to:` oper-ate:
mined.- phase relationship»` eachnof; saidï tw0~ gas-v
on arcommonìmainand provided withîmeanssfor,
generators: havingv af speedfcontrollen; ai. pressure.
maintaining'. autnmaticallyM a~ predetermined
nected'fto.saidsourceßiiñuid pressure;
phasereiationship between- themg. saidfmeans i in.u
fluid; circuit ` for. actuating'v said.: controller: and` a~
cluding. a g source; of liquid 1 under. pressure,- a duct. 15
de_viceeion interruptingsaid circuit'.syncl'ironnuslyfy
cennectediwithisaidesource andîincludingìtwohy
oncez» per; cycle» 0L the-associated: gassgeneratcr;
drauliczvalyes arranged in serie-sv in-saídzdlletzand.
actuated. respectivelyf by» saidA machines; for inim
terrupting the flow-f of, liquid. in said: ductesyfnl
chronously-.~ with`v the operationl of said. machines
andga'master devicefcapable‘- of interruptinggeach:
of. said circuits; synchron«311513Z»ata:‘predetermined.v
said: gasfgener-ators; arei maintainedï in _ saidipre`-`
respectively,Yc the». arraiigaement.:being-- suclr. that,`
determined pliasefrelationship, there are overlaps?
between the? noneinterrupting- periods: of saich
master». device andi. of each. of sa-idîslave'.4 devices;
variation oil- said overlaps: dueß to;~ departure: oiî
when. said: predetermined : phase. relationshipfeie»
istsí. there. is: anf overlap: between. the» non-inter
rupting; periods? of» said@ two Valves,- a. controller
forY varyings the.A period of oscillation of-l one; of.Y
said machines> whichi acts: as a: slave„saidncnn--trnller. including. a.. differential. hydraulic. prese
sure-responsive :device .onef side cf- Whichïisl conÍ
nectedmeAbeesupplied-WithiliquidJoy; said duct and»
a. meteringgpcrtJ and.- tofdischarge.- liquid
frequency, .the arrangement beingsuchithaa'whem
f. said\- gas--generators.-- from: said: predeterminismA
phase*relationshipcausing: Vania-tion of. thefznea'n‘y
rates: of. ñnwfoñ. fiuidfinf said circuits andïspeedk
correcting actuation' df; said: contrcll'erss
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