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Патент USA US2405322

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Aug. 6, i945, . »
l
T. D. NlsBET
.
Filed July l0, 1945
m
. 254059322
2,405,322
Patented Aug. 6, 1946
>UNITED STATES PATENT OFFICE
2,405,322
FLUID PUMP .
Thomas D. Nìsbet, Rocky River, Ohio
Application July 10, 1945, Serial No. 604,244
11 claims. (C1. 10a-200)
1
2
My invention relates in general to fluid pumps
the original shipping or delivery container into
another tank or Vessel, and particularly where
and> more particularly to fluid pumps adapted to
be mounted on a container for transferring the
fluid in the container to a vessel or other con
little suction or head pressure is required. Th‘ese
types of pumps are usually referred to as transfer
pumps. One of the most common type of trans
fer pump found on the market is operated by a
crank involving a rotary principle and thus re
tainer.
' An object of> my invention is the provision
of a 'pump having two independently operable
pistons Within a cylinder in which' the pistons
may be actuated toward and away from each
other by an actuating lever which may be actu
ated back and forth through an angle less than
180 degrees.
-
quires a considerable amount of space or room
ic
between the pump body and the fluid container
whereby a full swing of the crank may be made.
In order to provide this space or head room, aV
pipe nipple is used toelevate the pump body away
Another object of my invention is the provision
of a pump having an L-shaped actuating lever
from the ñuid container which precludes the
screwing of th'e pump body directly into the drum
whereby theA pump may be directly mounted upon
a container without the actuating lever contact
or container.'_ In my invention,> the pump body
may be screwed or attached directly to the ñuid
container from which fluid is to be pumped.
With particular reference to the drawing, the
ing or engaging the container on which the pump
is mounted.
'
.
l
Another object of my invention is the provi
reference character I0 represents a fluid con
sion of a pump having two independently oper 20 tainer from which fluid such as gasoline or oil
able pistons within a cylinder in which the pistons
is to be transferred. As shown in Figure 1, my
are actuated by a rocker which oscillates through
pump which is indicated by the-reference char
an angle less than 180 degrees.
acter II is connected directly to the top of the
Another object of my invention is the provision
container I0 and is adapted to be actuated by a
of a pump having two independently operable pis 25 manually operable lever V36 which is rocked back
tons within a cylinder, in which the pistons move
and forth to produce the pumping operation.
toward and away from each oth'er and in which
With reference to Figure 2, my pump comprises
the movement of the pistons is maintained sub
an intake housingIZ, a discharge housing I3 and
stantially in a straight line motion.
a cylinder I4 mounted therebetween. Th'e dis
Another object of my invention is the provi
, charge housingl3 is provided with an annular
sion of a bracket for aligning a rodwhich actu
steppedshoulder 24 and the intake housing I2 is
ates one of the pistons substantially co-axial of
provided >with an annular stepped shoulder 25
the cylinder, the said rod also functioning as a
and as illustrated the ends of the cylinder I4 re
slidable guide rod for the movement of the other
spectively abut against these annular stepped
piston.
, _ shoulders 24 and 25 and are firmly held therein
VAnother object of my invention is th'e provi
sion of mounting one of the pistons upon a, sleeve
which slidably engages the rod that actuates the
other piston.
by the connecting bolts 26 which extend between
the discharge housing I3 Vand the intake housing
I2. When the connecting bolts 26 are turned
down tight a good sealing engagement is made
Other objects and a.' fuller understanding of 40 between the end 0f the cylinder I4 and the an
my invention may be had by referring to the fol
nular stepped'shoulders 24 and 25. A discharge
lowing description and claims, taken in conjunc
conduit I5 may be threadably connected to the
tion with the accompanying drawing, in which:
Figure 1 represents a side elevational View of a
pump embodying th'e features of my invention
and is shown as being mounted upon a fluid con
tainer;
Figure 2 is a longitudinal cross-sectional View
of my pump, the section being taken along the
line 2-2 of Figure 3; and
~
Figure 3 is a view of my pump taken along the
line 3_3 of Figure 2 with the rocker and the con
necting links omitted for the purpose of clarity.
One useful employment of my pump is that of
discharge housing I3, and as the pump is oper
ated the iiuid which is being pumped is dis
charged out through the discharge conduit I5
into another vesselor container. An intake con
duit I6 may be threadably connected to the bot
tom of the intake housing I2 and when the pump
is in operationth'e intake conduit I 6 extends
down into the container I0 for conveying liquid
to the intake housing I2. Although not shown,
a ball check valve maybe placed immediately in
the intake housing I2 above the intake „conduit
I6 to prevent the return of the flow of liquid to
transferring liquid such as gasoline or voil from 55 the container.
However, I ñnd from actual op-~ ‘
2,405,322
3
4
from disengagement with the rocker arm 35.
Similarly, the lower end of the connecting link
34 is provided with a right angle portion which
valve may be dispensed with, particularly where
'extends through an opening in the left-hand end
little fluid suction or vacuum is required to ele
vate the liquid from the container to the pump. fil of the rocker arm. A cotter key 44 is employed
to keep the connecting link 311 from becoming dis
However, where the head pressure or suction be
engaged with th‘e rocker arm 35. The upper ends
comes great it is preferable to employ a ball check
of the connecting links 33 and 34 are respectively
valve in the intake housing I2 above the intake
provided with right-angle portions for fitting, re
conduit I6. As illustrated in Figure 2, the lower
spectively, in the openings provided, in the actu
end of the intake housing l 2 is provided with two
ating lugs 32 and 3l. ‘- Cotter keys need not be
stepped threaded portions I1 and I8 "whereby my
provided in the upper ends of the connecting
pump may accommodate threaded openings in
the container of diiîerent sizes. Original ship-j. ” links to keep them from becoming disengaged
ping or delivery containers or drums as now found ‘I VV.with the actuating lugs because the lit of the
"lower end of the connecting links into the rocker
on the market have two sizes of threaded open
arms prevents this engagement.
ings and thus if my pump is to be connected >to
eration that my pump produces a sufficient vacu
um so that for ordinary purposes th'e ball check
a container having a small opening then the
` The upper piston I9 which is connected to the
upper end of the rod 21 is adapted to rest upon
ashoulder 45 provided on the rod 21 and is con
nected thereto by means of a nut 54. The upper
piston I9 comprises a bottom plate 53, an inter
threaded portion I3 is employed, andin theevent Y
that the container has the large openingthen the
threaded portion I1 is employed to connect my
pump to the top of the liquid container.
" Mounted within the cylinder Ili` of my pump are
mediaterplate 55, and atop plate 52. Between
two pistons I 9 and 2Il,_which` are ‘substantially7
of the same construction. The upper piston is
designated by the reference character I9 and the
the bottom plate 48 and the intermediate plate
59 is a gasket 49 having an annular up-turned
iiange which fits against the inside wall ofthe
cylinder Ill. The annular up-turned flangetof
lower piston by the reference character 2U. As
illustrated, the upper piston ISgis' connected to the
end of a centrally disposed rod 21. The lower
end> of thefrod 21 is adapted'to slidably move
UI
the gasket 49 may be held against the inside Wall '
of the cylinder ld Vby means of a suitable wire
spring indicated by the reference character- 6l)
through a guide hole 29 in a bracket 28A which is
which may be either of a single wire type or a
preferably integrally connected to'the sidewall
coiled spring type for providing the necessary
resiliency. The top plate 52 andthe intermediate
of the intake housing I2. The lower piston 25 is
provided with an' inner sleeve 33 which slidably
fits around th‘e rod 2,1 whereby >the lower piston
plate 58 are held apart by means of al spacer 5I.
A washer 53 may be provided under the nut 54
2l! may be" actuated independently of the upper
and on top of the top plate 52.
piston I9. Connected to 'the’lower end of the
sleeve 3i)Y is an actuating _lug 3i Vwhic'h'is adapted
to be ‘reciprocally' operated bya connecting link
provided in the intermediate plate 5B which func
Holes 56 may be
tion as valve seats for ballY valves 55 which pre
vent the back ilow of the liquid through the pis
ton It. Th’e‘top plate 52 may be provided with
holes 51 into which the ball valves 55 partially
extend, whereby the holes 51 operate as retaining
ated >by the rocker arm 35 through means of an
holes to keep the ball valves between the inter
actuating, lug.32 connected tofthe bottom end of
mediate plate and the top plate. As Huid or liq
the”> rod 21 and an interconnecting link '33 which
uid ñows upwardly through the piston? I 9, the ball
is connected to th‘e opposite e'nd of the rocker
arm to that from which' the connecting link >Mis, 4.5 valves are raised from their seats 55 but when
liquid tends to flow backward through the piston
connected. >As, shownv in Figure'3, the L-'shaped
I9 the ball valves make seating >engagement with
lever y¿346e 'is'constructed of a íir'st portion 31. and a
Y second portion 38. Theñr’stp'ortion 31 isadapt
the holes 55 for preventing this back flow. The
leather gasket e9 and the bottom plate 48 are
ed to 4be mountedv `for rocking movement ~into
bearing lugs 4I’ andV 42 preferablyl constructed 50 likewiseprovided with openings 53v and 59 to pro
integrally with the intake housing, I2.Y The rock
videA a passageway for the fluid or liquid to ñow
through th‘e seats for the ball valves.
er arm 351s non-rotatively. connected to the ñrst
portion 31 of the L-shap'ed lever and is disposed
Theconstruction of the lower piston 20 is sub
stantially the same. as that of the upper piston
between th'e two bearing lu'gs 4j ~and 42. For the
purpose'of, clarity, the rocker' arm 35 is not shown 55 I9 and is connected to the sleeve 30 by means ofV
in Figure 3. A packing gland nut 39 surroundsl
a nut 54 which holds the lower piston 20 upon the
sleeve against the upper surface of the actuating
the iirst portion 31 of the L-shaped lever' and is
34!ß froma rocker arm`35'actua‘ted bythe lever 35.
The rod 2,1. and the upper piston IEt'are"V also actu
adapted'tò' compact a' packing 45 which surrounds
the iirst portion 3T "of theïL-s'haped lever to pre
vent leaking of liquidffrom< thel intake housing I2.
The second portion 3_.8 of the L’-shaped lever ex
tends externally of the intake housing and is dis
posed forrmanual rocking movementV back and
forth for pumping liquid. The angle through
lug
3|.
'
'
'
`
In operation, as the rocker arm 35 is rotated.y in
60 a clockwise direction, the linkage is suchas to
»cause the upper piston I9 to move downwardly
and the lower piston 2€),to. move upwardly. As
the upper piston moves downwardly it is merely
displaced within the liquid contained within the
> 20 moves.
which the> levermay be operated- is less than 180 65 pump cylinder I4. As the lower piston
degrees and is preferablyv within lthe range of 60
upwardly itforces the liquid which'ls above the
piston` outwardly of the discharge conduit I5 and
to 9D degrees.' Accordingly, the actuating lever
at the same time draws in liquid from the con~
tainer Iûinto the intake housing- I2 and the cylin
70 der which is below the piston.y 20. >When' the
nected directly tothe container. f ’
«Y '
rocker arm, is rotated ina counter-clockwise di
The lower end of the connecting link 33 »is pro
rection the mechanical linkage is such as to move
videdfwith a right l'angle portion which is'adapted
does not interfere with the liquid container andV
thus; the pump -intake housing I`2 may be con
the- upper. piston> lSupwardly and the lower> pis
ofgthe rockerrarm as_‘shownin Figure 2. >A cotter~
ton 2U. downwardly.Y The movement of the lower
keyf is‘employed to. keepsthe,'cohhvecíysing.l
*_ 75„y piston 270 downwardly is merely a displacement
t0>> it.' Within an opening inthe yright-hand end
2,405,322
5
6
of the piston within the liquid, in which case the
liquid within the cylinder I4 iiows »upwardly
through the ball valves into ,the portion of vth'e
cylinder above the lower piston 20. 'I'hemove
ment of the upper piston in an upward direction
forces the liquid which is above the piston out
through the discharge conduit l5 and atth‘e same
timeproduces a suction for elevating the liquid
'said rod and adapted-tc actuate thesecond pis
ton, a first connecting link ‘for actuating said
struction is such as to deliver liquid upon each
actuation of the actuating lever 36, and thus may
means in said intake housing connected tothe
íirst portion of the L-shaped lever and having
be characterized as a double-action pump.Y , Th'e
opposite ends adapted. respectively to actuate rthe
rod, a second connecting link for slidablyv actu
ating said sleeve relative , to said rod, an L
shaped lever having a first portion and a sec
ond portion, means for mounting `the Viirst ,por
tion in the intake housing for rocking movement,
said second portion Yof the L-shapedgleverex
withinthe cylinder I4 which is below the upper
tending externally of the intake housingvand
piston I9. Accordingly, my double piston con 1.0 being disposed for manualA operation, rocker
guide bracket 28 which stabilizes the lower end
ñrst and second connecting links for independ
of the vrod 21 enables me to¿bring the two pistons
ently actuating said pistons in the cylinder upon
in close proximity with each other without tipping
manual movement of the second portion of „the
the pistons. Accordingly, the pistons move in a
L-shaped lever.
n
y
¿ f,
straight line motion sinceY the actual center of the
3. A fluid pump, comprising an» intake hous
rod 21 is maintained ¿co-axial with‘ the center of`
ing, a discharge housing, a cylinder mounted be.
the cylinder I4. In other words, the> plane of 20 tween .the intake housing and the discharge
the pistons is kept perpendicular to the vaxis of
housing, iirst and second pistons independently
the cylinder I4 as the rocker arm is actuated by
operable in the cylinder, a rod for actuating the
the lever 3E. By reason of the straight line mo
lirst piston, a sleeve slidablymounted around.
tion of the piston as effected bythe guide bracket
said rod and adapted to actuate the second pis
23, it is‘to be noted that I am not restricted in 25 ton, a iirst connecting link ‘for actuating .said
the diameter of my pump cylinder since there is
rod, a second connecting link for slidably actu
no tendency for th'e pistons to tip within the
ating said sleeverrelative to said rod, an L_.
cylinder. Ii they were allowed to tip it would
shaped lever having a iirst portion-and a second
cause leakage of the liquid as well as binding of
portion, means for mounting the ñrst portion in
the pistons within the cylinder. In actual con 30 the intake housing for rocking movement, said
struction, my cylinder and piston may be, of such
second portion of the L-shaped lever extendingA
size and dimension as to deliver the predeter
externallyoi the intake housing and being. dis..
mined amount of liquid such, for example, as onev
pint-for each rocking travel of the lever arm 35.
posed for manual operation, rocker means linsaid
' intake housing connected to the first portion of
In assembly, the connecting links and the rocker 35 the L-shaped vlever and having> oppositeends
arm 35 and the actuating lever are ñrst mounted>
adapted respectively to actuate the -iirst and
within the intake housing! 2, after which the rod
second connecting links forL independently ac
2‘IA and the piston cylinders may be assembled.
tuating said pistons in the cylinder` upon man
After the pistons are assembled within the cylin
ual movement ofA the> second portion. of the .L
der, then the discharge housing I3 isbolted down 40 shaped lever, and a bracket connected to the in
by means of the connecting bolts 26.
take housing having an opening therein through'
vAlthough I have described my invention in its
which the said rod slidablyreciprocates forista-ï
preferred form with a certain degree of particu
larity, it is understood th'at the present disclosure ~
of the preferred form has been made only by way
of example and that numerous changes in the
details of construction and the combination and
arrangement of parts may be resorted to without
departing from the spirit and the scope of the
invention as hereinafter claimed.
Y What is claimed is:
l
bilizing the rod, whereby its longitudinalaxis
substantially coincides with the longitudinal‘axi's
of the cylinder.
.
.
>
Y,
'
4. A fluid pump, comprising ‘a cylinder, a iirst
-and
a second piston
independently operable
therein, a r-od for actuating the said first piston,l '
a sleeve surroundingand slidably mounted‘upon
50 said rod for actuating the second piston, sta-.
.
1. A fluid pump, comprising- an intake housing,
a discharge housing,‘a cylinder mounted between
the intake housing and the discharge housing,
a first and a second `piston independently oper-.
able in said cylinder, means including a ñrst con
necting link for reciprocally actuating the first
piston and a second connecting link for recipro
cally actuating the second piston, and an L
shaped lever having a iirst portion4 and a sèc
ond portion, means for mounting the iirst por
bilizing means having Yan opening in which said
rod 'slidably moves `for maintaining the reciprocal>
movements of the rod-in a straight-line motion
within said cylinder, and means including `first
and `second links for . independently actuating
said rodkand said sleeve to- operate said-pistons
independently -in said- cylinden' ñrst connection _
means onY one‘side of said stabilizer means for
connectlng said iirst link to said rod, second con
nection `means on the vopposite side of »said sta
' bilizer means for connecting said second link to
tion of the L-shaped lever for rocking movement
said sleeve.
1
in the intake housing, said second portion of the
5. In a fluid pump having a cylinder and a
lever extending externally of the intake housing
housing at one end thereof, the improvement of
and being disposed-for manual operation, rocker 65 a piston arrangement to operate in the said cyl
means in said intake’housing connected to-the
inder, said improvement >comprising a lirst and
first> portion of the L-shaped lever for operating
second piston mountedv for reciprocatingpump
the connecting links and thereby independently
ing action, a longitudinally reciprocable rod, a
reciprocating the pistons within the cylinder.
sleeve memberproviding afhub in-said second
2. A fluid pump, comprising .an intake hous 7.0; piston, said rod extending through said second
ing„a discharge housing, a cylinder kmounted be
' piston hub with `sliding engagement therewith, '
tween the intake housing and the discharge hous
thereby permitting said second piston to be guid- .
inghfìl‘st and second pistons independently op
ed by the said rodl but to reciprocateY independ
erable in the cylinder, a rod for actuating the
ently thereof, said rod being secured to said> firstl
piston,wa sleeve slidablyw mounted around 7gg piston and operating"` said `first piston recipro
:incassa
7
8
cably> within said cylinder, centrallysupported
ton having an opening through the center there
guide means tolguide the end of the rod oppo-`
of, said rod extending through the said center
opening of the second piston, said rod being se
site from- the end secured to the said ñrst piston,
and aetuatingfmeans having first connection
cured' at one end thereof to the iirst piston and
disposed to reciprocably move said ñrst piston,
means on one side >oi? said guide means-‘connect
stationary axis rocker means within said intake
edto said rod and second connection means on
housing, two extension links extending from said
the. opposite side of said guide means connect
rocker means, one of said extension links serving
ed to said sleeve memberrfor respectively oper
to operate said center rod and first piston, and
ating the said ñrst and second pistons with op
posed reciprocating movements within 'said cyl 10 the other of said extension links serving to oper
ate the said second piston, said second piston
inder.
moving reciprocably within said cylinder- inde
6.-' In a fluid pump having a cylinder and a
pendently of the direction of longitudinal move
housing’at one end thereof, the improvement of
ment of the said rod but said rod serving as a
apiston arrangement to operate in the Said cyl
guide therefor, lever Varm means extending from
inder, said improvement comprising a first and
said rocker means to theexterior of the housing,
second piston mounted for reciprocating pump
whereby a rocking motion may be transmitted to
ing action, a longitudinally reciprocable rod, a
the rocker means to operate the pistons, and a
sleeve member-providing a hub irl-said second pis
discharge opening on the pump barrel chamber
ton'„said rod‘extending through said second pis
on the opposite-end of the chamber from the in
ton AhubY withk sliding engagement therewith,
thereby permitting said second piston to` be guided
takehousing.
by the said rod but to reciprocate independently
thereof, said rod being secured to'said first piston
and operating said first piston reciprocably with
9. A ñuid pump comprising a iirst housing, a
second housing, a cylinder mounted between the
first and second housings, a first and a second
’
`
1
in said cylinder, guide means extending from the 25 piston independently operable in vsaid cylinder,
means including a first connecting link for recip
wall of said housing to guide the end of the rod
opposite from the end secured to the said iirst ` rocably actuating the ñrst piston, and a Second
connecting link for reciprocably actuating the
piston, Vand actuating means having ñrst connec
second piston, an actuating member having a
tion means on one side of said guide means‘con
nected to said rod and second connection Vmeans 30 first portion and a second portion, means for
mounting the ñrst portion of the actuating mem
on the opposite side of said guide means con
ber for rocking movement in said first housing,
nected to said sleevey member for respectively op
said second portion of the actuating member ex
erating the said iirst and second pistons with
tending externally oi the ñrst housing and being
opposed reciprocating movements within said cyl
inder, >Vsaid actuating means including rocker 35 disposed for manual operation, rocker means in
said first housing connected to the first portion
means and an L-shaped lever mountedxfor rock
of the actuating member for operating .the con
ing movement in said housing and adapted to
necting links, and thereby independently recip
oscillate through an angle less than 180degrees.
rocating the pistons within the cylinderyonerof
7. In a iluid pump having a .cylinder and a
housing at one >end thereof, the improvement of
a piston arrangement to operate> in the said cyl
inder, said improvement comprising a ñrst and
Second piston mounted for reciprocating pump
ingv action,V a longitudinally reciprocable ?rod,: a
Vsleeve member providing a hub in said second
piston, said ïrod extending throughY said second
said housings constituting an intake i. housing
having an inlet and the other said housing con
stituting a discharge housing having a. discharge
outlet, said pistons each having a flow passage
1 through which fluid iiows from said intake hous
ing tov-said discharge housing, said pistons, con
necting links and rocker arm being disposed be
tween said inlet and said outlet.
pistonhub withv sliding engagement therewith,
10. VA pump comprising a ñrst housing, a second
thereby permittingsaid second piston to be guided
housing, a pump cylinder secured between said
bythe said-rod 'but to reciprocate independently
thereof,` said rod being securedito said first piston 50 housings, a iirst and second piston operable With
with opposedreciprocating Vmovements within?,~
in said cylinder, a reciprocable rod extending sub
stantiall‘yalong the-longitudinal axis of the cyl
inder, said'secon'd piston having a sleeve centrally
disposed thereof; said rod extending'through the
Vsaid sleeve ofl thel second piston', said rod being
securedat one' endgthereof to the first piston and
disposedl to. reciprocably move said iirst piston,
said cylinder, said actuating, means including»,Y an
stationary axis rocker means within ` said', firstl
L-shaped ,lever having a iirstr portion. and a sec,
ond portion, means for mounting said ñrst: por
housing, two extension-links extending from said,
rocker means,A jiirst connection means for con-ï
Vand operating said ñrst piston reciprocably with
in-said cylinder, centrally supported guide means
to guide the end of therod oppositefrorn. the. '
end secured to the said first piston, andactuating
means connected-to said rod and said Sleeve mem
ber for operating the said first and secondpistons
necting one of said extension links to said rod for,
tion for rocking movement in said housing, said
operating said ñrst piston, second connection4
second portion extending externally of said hous
means for connecting the other of said-extension
ing and being disposed for manual operation, and
links to> said _sleeve’ifor operating-said lsecondv pis
rocker means mounted on said lirst portion, and,
nrst andsecond connecting links operated-by the 65 ton,vsaid,;second.piston andsleeve moving recip
rocably Within said-cylinder independently of the
rocker means and connected respectively to the.
directionof- longitudinal movement ofthe said
said rod and to thesaid sleeve member on oppo
site sides of said guide'means for actuatingv said-_
rod but said rod serving as aguide therefor, ceni
trally supported guide means disposed between
pistons with opposed movements within said
said ñrst and second’c'onnection means for-guid
cylinder.
,
f
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Y
»
second piston >operable within said cylinder»,_~a
ingv said rod, actuating means extending from.
said rocker means to the exterior of» s'aid- iir'stf
housing, whereby a rocking motion may be trans
reciprocable rod extending substantially' along the; u
Y l rockerA means
K
mitted Áto the
to operate the pistons,
8. In a pump, an intake housing, a pump cyl
. inder secured to said intake-housing, a first and
longitudinal axis ofthe cylinder, said second-"pis- 76 said pistonseach having a ñow `passage through*
¿405,322
9
i0
connecting one oi said extension links to said rod
for operating said ñrst piston, second pivotal con
nection means for connecting the other of said
through which fluid flows as said pistons are
operated.
extension links to said sleeve for operating said
11. A pump comprising a ñrst housing, a second Cà second piston, said second piston and sleeve mov
ing reciprocably Within said cylinder independ
housing, a pump cylinder secured between said
ently of the direction of longitudinal movement oi
housings, a ñrst and second piston operable With
the said rod but said rod serving as a guide there
in said cylinder, a reciprocable rod extending sub
stantially along the longitudinal axis of the cyl
for, actuating means extending from said rocker
means to the exterior of said ñrst housing, where
inder, said second piston having a sleeve centrally
by a rocking motion may be transmitted to the
disposed thereof, said rod extending through the
rocker means to operate the pistons, said pistons
said sleeve of the second piston, said rod being
each having a flow passage through which fluid
secured at one end thereof to the first piston and
disposed to reciprocably move said ñrst piston,
Íiows between said housings, said ñrst and said
second housing each having an opening through
stationary axis rocker means Within said ñrst
which ñuid flows as said pistons are operated.
housing, two extension links extending from said
THOMAS D. NISBET.
rocker means, ñrst pivotal connection means for
which fluid flows between said housings, said first
and said second housing each having an opening
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