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Патент USA US2413035

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Dec. 24, 19%.
Filed Sept. 16, 1944
5 Sheets-Sheet 1
' '
24, 19%-
Filed Sept. 16, 194-4
5 Sheets-Sheet 2
ec. 24, 1946-
Filed Sept. 16, 1944
5 Sheets-Sheet 5
FT?“ 8? 700 j
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BY 64%,,‘ _ v
Dec. 24, 1946.
Filed Sept. 16, 1944
5 Sheets-Sheet 4
Dec. 24, 1946.
Filed Sept. 16, 1944
5 Sheets-Sheet 5
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Patented Dec. 24, 1946
Warren H. De Lancey, Spring?eld, Mass., assign
or to Gilbert & Barker Manufacturing Com
pany, West Spring?eld, Mass., a corporation of
Application September 16, 1944, Serial No. 554,367
5 Claims. (0]. 230-139)
This invention relates to improvements in ap
Daratus for supplying ?uids, such as air and oil,
to an oil burner, such for example as an air
atomizing burner to which both primary and
secondary air must be supplied aswell as fuel.
The invention, while capable of other applica
tions, is primarily designed to supply small-size
on the lines 2—2, 3--3 and 4-4, respectively, of
Fig. 5 is a fragmentary sectional elevational
view of the oil pump shown in Fig. 1 but drawn
to a larger scale;
Fig. 6 is an enlarged cross sectional view taken
on theline 5-5 of Fig. 5;
, burners, such for example as those used with hot
Fig. '7 is an enlarged fragmentary end view
water heaters, where oil is consumed at very low
taken from the right hand end of Fig. 5;
rates, say from one-twentieth to three-quarters 10 , Figs. 8 and 9 are fragmentary sectional views
of a gallon per hour. Oil at such low rates can
taken on the lines 8-8 and 9-9, respectively, of
not be handled properly by the so-called pressure
atomizer usually used in gun type burners and it
Fig. 4:
is necessary to resort to the so-called air-atomiz
on the line“ Ill--I 0 of Fig. 2;
Fig. 10 is a fragmentary sectional view taken
ing nozzle. This invention provides the means 15
Fig. 11 is a small scale elevational view, show
for supplying the air for such nozzle at regulated
ing in more or less conventional form, the air
pressure and also for supplying the oil at any
and oil supply apparatus mounted on an oil
selected rate over a range, such as that above set
forth, with an arrangement whereby the oil
Fig, 12 is a much enlarged sectional elevational
pumping rate may be readily and conveniently 20 view of the atomizing nozzle of the burner; and’
. varied while the oil pump is in operation.
The invention has for one object the provision
Fig. 13 is a much enlarged cross sectional view
taken on the line I3—-|3 of Fig. 12.
of an oil-supplying means, together with a cut
Referring to these drawings and ?rst to Fig. 1
off valve; an air pump of the positive displace
thereof, the apparatus includes a positively-act
ment type, having a by-pass and a valve con 25 ing displacement pump I for supplying primary
trolling the same; and means actuated by pres
air to the burner, a variable-capacity positively
sure of the pumped air for opening the oil valve
acting displacement pump 2 for supplying oil to
when the Dumped air reaches a predetermined
the burner and a fan 3 for supplying secondary
pressure and subsequently opening the by-pass
air to the burner. Both pumps I and 2 and the
valve when said pressure is exceeded, .
30 fan 3 are driven by an electric motor, of which
The invention has for another object the pro
the stator laminations are indicated ‘at 4, the staé
vision in a single unit of an air pump, an oil
tor winding at 5, the rotor laminations at 6, the
rotor spindle at ‘I, as ?xed to laminations 6, and
the rotor shaft at 8 as ?xed to the spindle 1. The'
actuated by the air-pressure-control valve.
35 motor has a cylindrical casing 9 to which are
The invention has for another object to provide
suitably ?xed, as by‘ the bolts I 0 (Figs. 1 and 2),
an electrically driven apparatus of the class de
inner and outer end plates II and I2, respectively.
scribed, mounted in the casing of the driving
The inner end plate I I is secured, as by cap screws .
motor and including a fan for supplying primary
I3, to the fan housing II of the oil burner, The
air to the burner as well as positive displacement 40 end plate II rotatably supports in any suitable
pumps, one for supplying the secondary air and
way the motor shaft 8 and on one end of the lat
one for supplying oil to the burner, together with
ter the fan 3 is ?xed, as indicated.
the necessary control valves and accessories for
said pumps.
pumps I and '2, the air ?lter, the air-pump by
The invention has for a further object the pro 45 pass valve, the oil valve and all the necessary pas
vision in apparatus of the type described of vari
sages and conduits which are associated with
ous structural features which contribute to a
these elements. The member I2 has a sleeve
compact arrangement of all the necessary parts
bearing I5, located coaxially thereof and rotat
in a very small space.
ably supporting the inner end IB of the air pump
The invention will be disclosed with reference 50 driving shaft IT. The shaft end I5 extends
to the accompanying drawings, in which-—
through member I2 and has its inner end- suit
Fig. 1 is a sectional elevational view of the com
ably coupled to the motor shaft.
plete apparatus for supplying air and oil to an
oil burner;
speed-responsive type, having a drum I8 ?xed to
Figs. 2, 3 and 4 are cross sectional views taken 55 shaft end I5; and a pair of weight segments I9,
pump with means for varying its capacity, an air
pressure-control valve, and an oil cut-off valve
each pivoted on a stud 20, ?xed to a ?ange of
spindle 1. The weights are drawn inwardly by
springs 2| and held thereby out of contact with
the inner periphery of drum [8. When the mo
tor attains a predetermined speed, the segments
I9 will be thrown outwardly by centrifugal force
to engage the inner periphery of drum I8 and
drive the same and shaft I1, The speed-respon
sive coupling has been indicated merely in con
ventional form herein. It may be of any suit
able and well known form, One suitable form is
shown in my copending patent application, Serial
No. 452,019, ?led July 23, 1942, patented Decem
ber 5, 1944, No. 2,364,132.
The air pump is best shown in Figs. 1 and 3. A
deep cylindrical recess is formed in the outer face _
of end member |2 to receive a sleeve 22 which
forms the liner for the pump chamber and which
1y spans the outer end of cylinder 42 and is se
cured at its ends, as by screws 48, to member l2.
The spring 46, acting between bar 41 and piston
45, holds the piston in the extreme inner position
- shown leaving a space with which both of the
passages 4| and 42 are constantly in communi
The piston 45 is movable to the‘left (as viewed
in Fig. 1) when the air pump has built up suffi
cient pressure to properly atomize the oil. This
piston operates an air by-passvalve and an oil
inlet valve as will later be described in detail.
The end member l2 has a circular ?ange 49,
grooved to receive a packing ring 50 of rubber or
the like. A cup-shaped, pressed-metal cover 6|
has its inner end partially telescoping ?ange 46
and its inner periphery engaged by ring'SO to
close liquid-tight the joint between the cover and
member 52. The cover is fastened in a manner
is cylindrical but located eccentrically of the
pump shaft H. The outer end of the pump cham 20 later to be described. This member and the cover
have ?anges 52 and 53, respectively, to support a
ber is closed by a member 23 secured to member
?lter screen 54, which encompasses the oil pump
l2 by a plurality of cap screws 24. This member
2. The end member |2 (Fig. 8) has a tapped hole
23 has a sleeve bearing 25 for the outer end 26 of
55 adapted for pipe connection to an oil supply
shaft l1. The pump rotor 21 is cylindrical with
a circular series of angularly-spaced and longi 25 tank. This tapped hole is connected by a passage
56 to the annular space 51 between the cover 5|
tudinally-disposed slots 28 in its periphery to re
and screen 54. Within the screen lies the oil
ceive one in each, blades 29, which are radially
pump surrounded by an oil chamber 58.
slidable in the slots and the outer edges of which
The oil pump has a valve-controlled inlet pas
engage the inner peripheral wall of member 22.
The ends of the blades and the ends of the rotor 30 sage best shown in Fig. 1. A radial passage 63
leads from the lower part of chamber 58 radially
engage the end walls of the pump chamber. The
upward into the inner end of a cylindrical recess
end faces of the rotor 21 have‘cylindrical recesses
21’, one in each, to receive rings 36. The ends
of each blade 29 rest on the outer peripheral sur
60 formed in the oil-pump-housing member 23,
above described. Threaded into and closing the
outer end of this recess is a hollow bushing 6|,
having a central oil inlet opening 62. The latter
faces of these rings and are thereby held with
the outer edge of each in contact with the inner
communicates with one end of a radial groove
peripheral surface of member 22. Inlet and out
let ports 3| and 32, respectively, are formed as ar
63 formed in the inneriface of an end plate 64,
cuate grooves in the inner end wall of the pump
which is secured with member 23 to member II
chamber formed by member l2. Air enters the 40 by the cap screws 24, above described. The other
spaces between pairs‘ of successive blades from
‘end of groove 63 communicates with a slanting
port 3| and is carrieddn a counterclockwise direc
passage 65 in member 23 leading to the pump
tion as viewed in Fig. ‘3 and discharged into the
inlet port 66.
port 32. This particular pump construction is one
A needle valve 61 controls the oil passage 62.
which is old and well known in the art. Further 45 A spring 68, coiled around the stem of this valve,
description of it is therefore deemed unnecessary.
acts . between bushing 6| and a snap ring 63,
The particular form of pump illustrated is not es
mounted in a groove in the stem, tending to open
sential to the invention and is given merely by
the valve. The latter is initially held closed
way of illustrative example of one of many types
against the force of spring 68 by the described
of displacement pumps suitable for the purpose. 50 piston 45. Formed in the inner end face of hous
Air is admitted to ‘port 3| by means of a passage
ing member 23 is a tapped hole 10. Set into this
33 in end member l2. This passage connects with
hole is a bellows 1|, the ?ange of which is clamped
one end of a cylindrical recess 34 formed in the
to the base of hole 10 by an annular nut 12. The
inner face of member l2. Closely ?tted into this
stem of valve 61 extends into the interior of bel
chamber is a suitable ?lter, herein shown as a 55 lows 1| and engages the closed end wall of the
felt 35 mounted between two wire screens 36.
same. Leakage of oil around the stem of valve
This ?lter is held in place by a snap ring 31, en
61 is prevented by the bellows. Formed in the
gaged in a groove in the peripheral wall of recess
l2 coaxially of valve 61 and communicat
34, or in any other suitable way. Air reaches the
ing with chamber 10 is a passage 13 and a slight
?lter from the air inlet 36 of the fan housing I4,
ly smaller passage 14. V The described piston 46
through holes, such as 39, in end member II and
has a stem portion 15 which is of large diameter
some of the unused slots, such as 40, in the stator
and hollow to receive the piston spring 46 and a
laminations, as will be clear from Fig. 1.
smaller portion 16 which bears on the end wall
The air pump outlet port 32 is connected by a
passage 4| (Fig. 1D) to the inner end of a cylinder 65 of bellows 1| and holds the oil valve closed. As
soon as the air pump has built up su?lclent pres
42 which is formed in the inner face of end mem
sure, the piston 45 will be moved by the pressure
ber l2 as best shown in Fig.1. Also connected
of the pumped air, moving stem 16-13 to the left
with the inner end of cylinder 42 is a passage 43
as viewed in Fig. 1 and allowing oil valve 31 to
(Fig. 2) which connects with a tapped hole 44,
adapted to be connected to the air inlet 01' the air-v 70 open. When the piston has been moved to the
left as far as possible, the end of stem portion 16
atomizing nozzle of the oil burner. Slidably
have drawn away from the end of bellows
mounted in cylinder 42 is a piston 46, yieldingly
1|. Movement 01 the oil valve and the bellows is
held in the illustrated and extreme inner position
limited by the abutment of snap ring 63 with the '
by means of a spring 46. This spring has a seat
in the center of a cross bar 41 which diametrical 75 inner end of chamber 10. The piston 46 can move
a greater distance (until it abuts cross bar 41) as
extends longitudinally through member 23 and
will be clear from Fig. 1.
a substantial distance into end plate I! where
it connects with .a radial passage 98, leading to
a tapped hole 88 in plate l2. This hole 89 is
adapted. to receive the oil pipe leading to the
nozzle 01' the oil burner.
The described adjusting stem 88 ot‘the oil
The by-pass for the air pump consists of the
passage ‘M at all times in communication with
the cylinder 42 and thus with the pressure side of
the air pump; a diametrical hole 11 in the portion
16 of the stem of piston 45; an axial hole ‘I8 in
the portion‘TG; the passage 13; the chamber 70
a pump is rotatably mounted in a centrally dis
and a groove ‘I9 in the inner end face of member
posed hub I" on the end plate 6| of the oil pump
23, which groove opens into the chamber of the l0 2. The outer end 01' this hub is threaded to
air pump. The stem portion 16 acts as a valve
receive a ?anged annular nut iili which serves
to control this by-pass, its end face whenen
to hold the described cover Si in place. The
gaged‘with the bellows, closing hole 78. A suit
cover has an interior hollow hub m2 which en
able seal to, pressed into the hole ‘It and seated
compasses the ‘ hub EM and which is drawn
against the shoulder formed at the intersection, 15 tightly against the outer end face of end plate
of holes ‘is and 1d, slidably receives stem portion
66 by nut iill to avoid leakage from chamber 58».
is and prevents communication between holes
The inner portion of hub i100 has an annular
. ‘i3 and it except by way of holes ‘ii and ‘it. It
groove to receive a packing ring W3 of rubber or
will be clear that when the pump has built up
the like to still further prevent leakage from the
sumcient air pressure, the by-pass will open and 20 chamber. The hub lot has an internal groove
enable excess air to merely circulate idly through »
to receive a smaller packing ring iiltl of rubber
' the pump. The air pump has a capacity in excess
or the liire which tightly engages stem so to pre
of its requirements. That is, the one pump must
vent leakage or" oil along the stern. This stem
have a capacity large enough to supply burners
of widely varying sizes and thus a lay-pass is
8%? is held against axial displacement by the
handle so engaging the outer end face of huh we
and by a. snap ring 865, mounted in a groove in
stem 83, engaging the inner end face of the hub.
necessary to take care of air not needed for the
The oil pump includes a cup-shaped rotor iii,
The described stop pin 93 is ?xed in the outer '
end of hub :08.
the end wall of which is ?xed to the portion 26
of the pump drive shaft. This rotor is mounted 30
The nut it! in its inner end has a circumfer
in and coaxially oia cylindrical chamber formed
ential groove in which is ?xed a snap ring m6.
in housing member 23 and closed by end plate .
The purpose or this ring is to enable the cover 5! ,
oil. A hole extends diametrically through the
which sticks tightly in place because of the pack
ing rings bi] and its, to be positively pulled off
annular wall of the rotor, forming two cylinders
A single rod .83 extends diametrically of 35 when nut iti is unscrewed, ‘the snap ring abut- >
the rotor and is slidably engaged as a, piston in
each cylinder 82. Fixed to the rod 83 at a loca
tion centrally between its ends is a cylindrical
which lies within the open, cupnlike
end of the rotor and may, by adjustment, be
positioned eccentrically or coaxially of the rotor.
in the uter end face of the member 86 is a di
ametrlcal slot 85 which slidably receives‘ a square
Engaged in this block is a round pin
9? which is fixed eccentrically of and on the in~
ting the shoulder it? on the cover for this pur- .
pose. This avoids the necessity for the use of
prying tools, such as screw drivers or chisels, and
the possible damage incident to their use.
_ In the use of the invention in connection with
an oil burner of the air-atomizing type, the fan
3 supplies air from its housing It into one end
of a tube m8 (Fig. 11), in the outlet of which is
arranged a. body will, carrying the nozzle till.
The air and oil discharge ports as and 95 of the
supply unit are respectively connected by pipes
iii and M2 to passages H3 and lid (Fig.12) in
the body We. Fastened to the forward end of
ner end of a stem 8%. In Fig. 6, 89 indicates the
axis of rotation of stem 38. By turning the stem
counterclockwise as viewed in Figs. 6 and 7 by
they body we as by a cap H5, screwed on to the
means of the handle so provided on the stem,
the axis of pin lil- may be moved from its posi 50 body, is a nozzle body il§,'havlng a frusto
tion or maximum eccentricity shown'in Fig. '5
conical outer end and a member iii, having a
complementary shaped part to engage said end
until its axis 99 coincides with the axis d2 of the
pump rotor ti. Thus, the capacity or’ the pump
and having the nozzle ori?ce lid. The nozzle
may be varied from a maximum to zero by in
crements as small ‘as desired.
' body H6 has a central oil discharge passage
A stop pin 98 55 H8 communicating directly with passage Ht.
(Fig. 7) limits the movement of handle til by
Formed between the abutting end of the bodies.
abutment with shoulders 9d on the handle to the
IE8 and H6 is an annular passage H9, receiving
air from passage lit and discharging it through
limits described. As the rotor 8i rotates coun
two longitudinal passages I20 in body He. The
tel-clockwise as viewed in Fig. 6, the outer end
of one of the cylinders 82 (the upper one) will 60 passages H8 connect one with each of two slots
communicate with the pump inlet port 88. This
i2! (Fig. 13), the inner ends of which open tan
is an arcuate groove which is formed in member
gentially into a whirl chamber I22, formed be
28 in encompassing relation with the pump rotor
tween the mating frusto-conical parts lit and
Si. As the rotor turns the upper cylinder d2
H'HFig. l2) and surrounding the frusto-conical
draws out from its piston, creating a partial vac 65 end of the oil nozzle. Air entering through slots
uum to draw in oil and ?ll the cylinder. Mean~
i2i is whirled around in chamber i22 and issues
while, the other cylinder which had previously
from nozzle are in a whirling stream, surround
been ?lled, is brought into communication with
ing the oil stream.
the outlet port 95, which is formed similarly to
In operation-on a call for heat from the burner,
port 86 but on the opposite side of the rotor. 70 the electric motor is started in any suitable way,
As the‘ rotor turns, the lower cylinder moves in
usually automatically in response to a thermostat.
on its piston to force out the oil into the outlet
The fan 3 is driven with the motor and is ?rst
port 95.
vbrought wellup towards its maximum speed be
fore the speed-responsive coupling operates to
sage 98 (Fig. 9) to one end of a passage 91 which 75
connect the pump and motorshafts i1 and 8
The outlet port 95 is connected by a radial pas~
the air tube I08, the combustion chamber to
member having -in one end a cylindrical pump
chamber with an inlet and an outlet conduit
therefor and in the other end a coaxial bearing,
which it delivers, and the several passes and fines
of the heating apparatus. Secondary air, at a
bearing for driving said rotor, said member also
sufficient rate to secure good combustion, is avail
able at the burner nozzle before the pumps .l
chamber a cylindrical chamber with one end wall
and drive the oil and air pumps 2 and i, respec
tively. This allows time for the scavenging of
and 2 are started.
Even then actuation of the
oil pump 2 is ine?ective until the air-pump i has
?rst built up the necessary pressure to insure a
supply of primary air at the necessary rate ‘to
a pump rotor in said chamber, a shaft in said
having between the second end and said pump
thereof in parallel closely-adjacent and partially
overlapping relation with the adjacent end wall
of the pump chamber‘ one of said conduits inter
connecting said chambers through the overlap
ping portions of said adjacent end walls.
the atomizing nozzle. Then, the oil valve 61 opens
2. In apparatus of the class described, a body
to allow ?ow of oil/to the nozzle. On stopping
member having in one end a cylindrical pump
of the burner, the electric motor is deenergized
chamber with an inlet and an outlet conduit
and, after its speed diminishes to a certain point,
therefor and ‘in the other end a coaxial bearing,
the speed-responsive coupling disconnects pumps
a pump rotor in said chamber, a shaft in said
I and 2, whereby the oil flow will be quickly out
for driving said rotor, said member also
off by the drop in pressure of the primary air.
having between the second end and said chamber
The ?ow of oil to the burner nozzle is thus stopped
ahead of the ?ow of primary air to avoid poor 20 a cylindrical chamber with one end wall thereof
in parallel closely-adjacent and partially over
combustion. The fan 3 continues in operation
lapping relation with the adjacent end wall of
after both pumps i and 2 have stopped in order
to scavenge the burner.
the pump chamber, a filter for air mounted in the
It will be noted that the size of theair passages
in the atomizing nozzle will determine the rate
of air flow when the predetermined pressure of
air has been established by the pump i. Then,
and only then will flow of oil to the burner be
permitted. The oil rate is conveniently regulable,
second chamber, said inlet conduit interconnect
ing said chambers through the overlapping por
tions of said adjacent end faces for the delivery
“apparatus and maybe turned by as small in»
crements as may be desired to vary the capacity
bearing for driving said rotor, said member also
having between the second end and said pump
of the oil pump from zero to the selected max
thereof in parallel closely-adjacent and partially
of ?ltered air into the pump chamber.
3. In apparatus of the class described, a body
member having in one end a cylindrical pump
even while‘ the pump is in operation, by means 30 chamber with an inlet‘ and an outlet conduit
therefor and in the other end a coaxial bearing,
of the member 90. The latter is located outside '
a pump rotor in said chamber, a shaft in said
the casing 5| which encloses all the rest of the
' The invention provides a compact arrangement .
of parts‘ enabling both pumps together with the
necessary valves, a screen, a ?lter, controls and
chamber a cylindrical chamber with one end wall
overlapping relation with the adjacent end wall
of the pump chamber, a movable wall mounted
in thesecond chamber and spaced from said end
conduits to be provided on the end plate of the 40 wall thereof, the outlet conduit for the pump in
terconnecting said chambers through the over
lapping portions of said adjacent end walls, said
supply chamber. The arrangement of the cham
member having a by-pass interconnecting the
bers 34 and 42, either or both, inone side of the
chamber and the inlet of the pump cham
end plate or body member i2 and the air-pump
ber, a ‘valve controlling said by-pass and con
chamber in the other side of the member is
nected to be actuated by said movable wall, and
thought to be important. The ?lter and air pres
yieldable means tending to move the movable wall
sure chambers 34 and 42 are arranged on opposite
toward said end face of the second chamber in ’
sides of the bearing i5 and in closely adjacent
opposition to the pressure of the pumped air.
relation therewith. These chambers 34 and 42
4. In apparatus of the class described, a body
have end walls which each overlap input the’
member having in one end a cylindrical pump
air-pump chamber and the passages 33 and 4i~
chamber with an inlet and an outlet conduit
are provided through the overlapping portions of
therefor and in the other end a coaxial bearing,
the adjacent end walls of the chambers... The
a pump rotor in said chamber, a shaft in said
?lter and'pressure chambers lie between the’same
two transverse planes. One of these planes coin 55 bearing for driving said rotor, said member also
having between the second end and said cham
cides with a plane in which one end of bearing
ber a cylindrical chamber with one end wall
i5 is located and the other of which lies between
thereof in parallel closely-adjacent and par
the two planes in which the ends of bearing I5
tially overlapping relation with the adjacent wall
are located.' The inlet and outlet passages 3i
the pump chamber, a movable wall mounted
and 4| of the air pump may thus be made very
in the second chamber, yieldable means tend
short and straight. The by-pass for the air pump
ing to move said movable wall toward said end
is also made- as short as possible by extending it
wall of the second chamber, said inlet conduit
along, and closely adjacent, the periphery of the
interconnecting said chambers through the over
air pump I from the pressure chamber 42 to
the more remote end wall of the air pump. Also, 65 lapping portions of said adjacent end walls,
' whereby said movable wall may be moved by the
both the air by-pass valve 18 and oil cut-cit
pressure of the pumped air, said member having
valve 61 are located in coaxial relation with the
an outlet from said second chamber for the
movable wall or piston 45 of the pressure control
air and a by-pass from the second cham
device. Radially, all parts are kept‘ within the
limits of the motor casing 9 and axially, the parts 70 ber extending parallel with the axis of the pump
chamber and closely adjacent the periphery
are kept within reasonably small limits in view of
thereof and entering the other end wall of the
the provision of two pumps and two control valves
pump chamber, and a valve controlling said by
and the rate-varying-means for the oil pump.
pas; and actuated by movement of said movable
I claim:
1. In apparatus of the class described, a body 76
driving motor within a casing, forming an oil
5. In combination, an electric motor including
a casing, end plates and a- rotor shaft;
housing connected to one end plate, the
having an opening interconnecting said
ing and the interior of the motor casing,
9. ion
in said housing on one end of said shaft, an air
pump chamber in the outer face of the other
end plate, a pump rotor in said chamber and
coupled to said shaft. the last-named end plate
having an outlet for said pump chamber and in
its inner lace a chamber. and a ?lter in'the last
named chamber, the ?lter chamber being eon
neoted at one end to the interior 0! the motor
casing and at the other end to said pump cham
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