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Патент USA US2409478

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Oct. 15, 1946.
2,409,477
W. H. DE LANCEY
FLUID SUPPLY APPARATUS FOR BURNERS
Original Filed Sept‘. 16, 1944
-5 Sheets-Sheet l
Q\\%maQ
INVENTORV
.?EZAI/CEY
'
ql- W146
ATTORNEYS
Oct. 15,, v1946.
I
'
H, DE LANCEY
2,409,477
FLUID SUPPLY APPARATUS FOR BURNERS
Original Filed Sept. 16, 1944
5 Sheets-Sheet 2
‘
ATTORNEYS
0a. 15, 1946. I
H. DE LANCEY
‘
2,409,477
FLUID SUPPLY APPARATUS FOR BURNERS
vOriginal Filed Sept. 16. 1944
5 Sheets-Sheet 3
' ATTORNEYS
_ Cd; 15, 1946-
w. H. DE LANCEY
‘
~
2,409,477
FLUID SUPPLY APPARATUS FORv BURNERS
Original Filed Sept. 16, 1944
5 Sheets-Sheet 4
INVENTOR
A/P/PtW/ZJEZANCEV
BY .
9‘- 7J4!
ATTORNEYS
Oct. 15,1946.
2,409,477
w. H. DE LANC'EY
‘
FLUID SUPPLY APPARATUS FOR BURNERS
Original Filed Sept. 16, 1944
5 Sheets-Sheet 5
INVENTOR
Mmzw/Z?zlnwzr
BY (2.30;!
qc 7/144
ATTORNEYS
Patented Oct. 15, 1946
I
. 2,409,477
UNITED STATES PATENT OFFICE
2,409,477
FLUID SUPPLY APPARATUS FOR BURNERS
Warren H. De Lancey, Spring?eld, Mass, assign
or to Gilbert & Barker Manufacturing Com
pany, West Spring?eld, Mass, a corporation of
Massachusetts
Original application September 16, 1944, Serial
No. 554,367. Divided and this- application
August 30, 1945, Serial No. 613,683
3 Claims.
.
(Cl. 103—6)
2
1
This invention relates to improvements in ap
paratus for supplying ?uids, such as air and oil,
view of the oil pump shown in Fig. l but drawn
to a larger scale;
to an oil burner, such for example as an air-atom
izing burner to which both primary and second
ary air must be supplied as well as fuel.
This application is a division of my application
Serial No. 554,367, ?led September 16, 1944.
The invention, while capable of other applica
tions, is primarily designed to supply small-size
‘
Fig. 6 is an enlarged cross sectional view‘ taken
on the line E——-6 of Fig. 5;
'
Fig. 7 is an enlarged fragmentary end view
taken from the right hand of Fig. 5;‘. ‘
Figs. 8 and 9 are fragmentary sectional views
taken on the lines 8—8 and 9-4}, ‘respectively, of
Fi
. 4;
..
burners’, such for example as those used with hot 1O
lgi‘ig. 10 is a fragmentary sectional view taken
water heaters, where oil is consumed at very low
on the line Hl—l? of Fig. 2;
‘
.
rates, say from one-twentieth to three-quarters
Fig. 11 is a small scale elevational View, show
of a gallon perhour. Oil at such low rates can
ing in more or less conventional form, the air and
not be handled properly by the so-called pressure
oil supply apparatus mounted on an oil burner;
atomizer usually used in gun type burners and it
is necessary to resort to the so-called air-atomiz
ing nozzle. This invention provides the means
for supplying the air for such nozzle at regulated
Fig. 12 is a much enlarged sectional elevational
view of the atomizing nozzle of the burner;-and
Fig. 13 is a much enlarged cross sectional view
taken on the line I3-‘-!3 of Fig. 12.
-
_ pressure and also for supplying the oil at any
Referring to these drawings‘ ‘and ?rst to Fig. 1
selected rate; over atr'ange, such ‘as that above set 20 thereof, the apparatus includes a positively-act
forth,‘ with an arrangement whereby the ‘oil
ing displacement pump l for supplying‘primary
pumping rate may be readily and conveniently
air to the burner, a variable-capacity positively
varied while the oil pump is in operation.
acting displacement pump 2 for supplying oil to
‘The invention has for one object the provision
the burner anda fan 3 for supplying secondary
of an oil-supplying means, together with a cut
air to the burner. Both pumps l and 2 and the
off valve; an air pump of the positive displace
fan 3 are driven by an electric motor, of which the
mentltype, having a by-pass and a valve con
stator laminations are indicated at 4, the stator
trolling the same; and means actuated by pres
winding at 5, the rotor laminations at 6, the rotor
sure of the pumped air for opening the oil Valve
spindle at "I, as ?xed to laminations 6, and the
when the pumped air reaches a predetermined 30 rotor shaft at 8 as ?xed to the spindle 'l. The
pressure and subsequently opening the by-pass
motor has a cylindrical casing 9 to which. are
valve when said pressure is exceeded.
suitably ?xed, as by the bolts In (Figs. 1 and 2),
The invention has for another object the pro
inner and outer end plates H and I2, respectively.
vision in a single unit of an air. pump, an oil pump
The inner end plate I l is secured, as by cap screws
with means for ‘varying its capacity, an air
I3, to the‘ fan housing M of the oil burner. The
pressure-control valve, and an oil cut-o? valve
end plate H rotatably supports in any suitable
actuated'by the air-pressure-control valve.
The invention has for another object to pro
vide an electrically driven apparatus of the class
‘described, mounted in the casing of the driving
motor and including a fan for supplying primary
air to the burner as well as positive displacement
pumps, one for supplying the secondary air and
one for supplying oil to the burner, together with
the necessary control valves and accessories for
said pumps.
The invention will be disclosed with reference
to the accompanying drawings, in which-—
'
Fig. 1 is a sectional elevational view of the com
plete apparatus for supplying air and oil to an oil ,
burner;
.
Figs. 2, 3 and 4 are cross sectional views taken
on the lines 2-4, 3-.—3 and 4—4, respectively, of
way the motor shaft‘ 8 and on one end of the
latter the fan 3 is ?xed, as indicated.
The end member 12 serves to support both
pumps I and ,2, the air ?lter, the air-pump by
pass valve, the oil valve and all the necessary
passages and conduits whichare‘ associated with
these elements.
The member l2 has a sleeve
bearing l5, located coaxially thereof and rotat
ably supporting the inner end l6 of the air pump
driving shaft IT. The shaft end I6 extends
through member l2 and has its inner end suitably
coupled to‘the motor shaft.
‘
As indicated herein, the coupling is of the
speed-responsive type, having a drum [8 ?xed to
> shaft end It; and a pair of ‘weight segments [9,
each pivoted on a stud 2i), ?xed to a ?ange of
spindle l. The weights are drawn inwardly by
springs 2| and held thereby‘out of contact with
' (1'
a;
:
Fig.‘ 5 is a ‘fragmentary sectional elevational 55 the inner periphery'o-f drum l8. ‘When-the motor
Fish
2,409,477
4.
3
attains a predetermined speed, the segments i9
will be thrown outwardly by centrifugal force to
engage the inner periphery of drum l8 and drive
the same and shaft ll. The speed-responsive
coupling has been indicated merely in conven
tional form herein. It may be of any suitable
and Well known form. One suitable form is shown
in my Patent No. 2,364,132, granted December
5, 1944.
which both of the passages M and 42 are con
stantly in communication.
The piston 45 is movable to the left (as viewed
in Fig. 1) when the air pump has built up su?i
cient pressure to properly atomize the oil. This
piston operates an air by-pass valve 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 air pump is best shown in Figs. 1 and 3. A 10 the like.
deep cylindrical recess is formed in the outer face
of end member I‘! to receive a sleeve 22 which
forms the liner for the pump chamber and Which
is cylindrical but located eccentrically of the
A cup-shaped, pressed-metal cover 5!
has its inner end partially telescoping flange 59
and its inner periphery engaged by ring 59 to close
liquid-tight the joint between the cover and mem
ber E2. The cover is fastened in a manner later
15 to be described. This member and the cover have
pump shaft IT. The outer end of the pump cham
?anges 52 and 53, respectively, to support a filter
ber is closed by a member 23 secured to member
screen M, which encompasses the oil pump 2. The
!2 by a plurality of cap screws 24. This member
end member 12 (Fig. 8) has a tapped hole 55
23 has a sleeve bearing 25 for the outer end 26
adapted for pipe connection to an oil supply tank.
of shaft H. The pump rotor 21 is cylindrical with
a circular series of angularly-spaced and longi 20 This tapped hole is connected by a passage 56 to
the annular space 51 between the cover 5| and
tudinallyedisposed slots 28 in its periphery to re
screen '54. Within the screen lies the oil pump
ceive one in each, blades 29, which are radially
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.
sage best shown in Fig. l. A radial passage 59
The ends of the blades and the ends of the rotor
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 2"! have cylindrical recesses
35.1 formed in the oil-pump-housing member 23,
21’, one in each, to receive rings 38. The ends
above described. Threaded into and closing the
of each blade 29 rest on the outer peripheral sur
faces of these rings and are thereby held with .30 outer end of this recess is a hollow bushing Bl,
having a central oil inlet opening 62. The latter
the outer edge of each in contact with the inner
communicates with one end of a radial groove 63
peripheral surface of member 22. Inlet and out
formed in the inner face of an end plate 64, which
let ports 3i and 32, respectively, are formed as
is secured with member 23 to member 12 by the
arcuate grooves in the inner end wall of the pump
cap screws 21!, above described. The other end
chamber formed by member l2, Air enters the
of groove 63 communicates with a slanting pas
spaces between pairs of successive blades from
sage ‘65 in member 23 leading to the pump inlet
port 3| and is carried in a counterclockwise direc
port'66.
.
tion as viewed in Fig. 3 and discharged into the
A needle valve '61 controls the oil passage 62.
port 32. This particular pump construction is one
which is old and well known in the art. Further 40 A spring 58, coiled around the stem of this valve,
acts between bushing 6! and a snap ring 69,
description of it is therefore deemed unnecessary.
mounted in a groove in the stem, tending to open
The particular form of pump illustrated is not
the valve. The latter is initially held closed
essential to the invention and is given merely by
against the force of spring 68 by the described
way-of illustrative example of one of many types
piston 45. Formed in the inner end face of
of displacement pumps suitable for the purpose.
housing member 23 is a tapped hole 10. Set into
Air is admitted to port 31 by means of a pas
this hole is a bellows ‘H, the ?ange of which is
sage 33 in end member l2. This passage connects
clamped to the base of hole 10 by an annular
with one end of a cylindrical recess 35 formed in .
nut 12. The stem of valve 61 extends into the
the inner face of member 42. Closely ?tted into
interior of bellows H and engages the closed
this chamber is a suitable ?lter, herein shown as
end wall of the same. Leakage of oil around the
This
a; felt?lter
35 mounted
is held inbetween
place by'two
a snap
wire ring
screens
3?, en
stem of valve 61 is prevented by the bellows.
Formed in the member [2 coaxially of valve 61
gaged in a groove in the peripheral wall of recess
and communicating with chamber ‘IE1 is a pas
34, or in any other suitable way. Air reaches
the ?lter from the air inlet 38 of the fan housing » sage ts and a slightly smaller passage ‘M. The
described piston 45 has a stem portion 15 which
l4, through holes, such as 38, in end member if
is of large diameter and hollow to receive the
and some of the unused slots, such as 40, in the
piston spring 46 and a smaller portion ‘I6 which
stator laminations, as will be clear from Fig. l.
bears on the end wall of bellows ‘H and holds the
The air pump outlet port 32 is connected by a
oil valve closed. As soon as the air pump has
passage 4| (Fig. 10) to the inner end of a cylin
built up sufficient pressure, the piston 45 will be
der 42 which is formed in the inner face of end
moved by the pressure of the pumped air, mov
member 12 as best shown in Fig. 1. Also con
ing stern 15-46 to the left as viewed in Fig. 1
nected with the innerend of cylinder 4&2 is a pas
and allowing oil valve 61 to open. When the
sage 43 (Fig. 2) which connects with a tapped
‘hole 44, adapted to be connected to the air inlet 65 piston has been moved to the left as far as possi
ble, the end of stem portion 16 will have drawn
of the air-atomizing nozzle of the oil burner.
away from the end of bellows ‘l |. Movement of
Slidably mounted in cylinder 42 is a piston Q5,
the oil valve and the bellows is limited by the
yieldingly held in the illustrated and extreme
abutment of snap ring 69 with the inner end of
inner position by means of a spring at. This
spring has a seat-in the center of a cross bar 47!‘ 70 chamber ‘in. The piston .45 can move a greater
distance (until it abuts cross bar 4'!) as will be
which diametrically spans ‘the .outer end of cylin
clear from ‘Fig. 1.
der t2 and issecured at its ends, as by screws £8,
The byepass for the air pump consists ‘of the
to member E2. The spring 65, acting bet-ween
‘passage '34 at all times in communication With
bar 41 and piston iliholds the piston ‘in ‘the ex"
treme'inner position shown leaving a space with 175 the ,. cylinder 42 and thus with the pressure side
‘2,409,477
of the air pump; a diametricalhole 11 in the
portion 10 of the stem of piston 45; an axial hole
18 in the portion ‘Hi ; the passage 13; the chamber
70 ‘and a groove ‘I9 in the inner end face of
member 23, which groove opens into the chamber
of the air pump. The stem portion 16 acts as a
. ‘The described adjusting‘ stem 88 of the oil
pump is rotatably mounted in a centrally‘ dis
posed hub ‘I00 on. the end plate 64 of the oil
pump 2. The outer end of this hub is threaded
to receive a flanged annular nut IOI which
serves to hold the described cover it in place.
The cover has an interior hollow hub I02 which
valve to control thisb-y-pass, its end face when
encompasses the hub I00 and which is drawn
engaged with the bellows,jclosing hole 18. ‘A
tightly against the outer end face of end plate 64
suitable seal I00, pressed into the hole 13 and
seated against the shoulder formed at the inter 10 by nut IOI to avoid ‘leakage from chamber 58.
The inner portion of hub I00 has an annular
section of holes ‘I3 and", slidably receives stem
groove to receive a packing ring I03 of rubber
portion 16 and prevents communication between
or the like to still further prevent leakage from
holes 1.3 and 14 except by way of holes 11 and 18.
the chamber. The hub I00 has an internal
‘It will .be clear that when the pump has built up
groove to receive a smaller packing ring I04 of
suflicient air pressure, the by-pass will open and
rubber or the like which tightly engages stem
enable excess air to merely circulate idly through
89 to prevent leakage of oil along the‘stem.
the ‘pump. The air pump has a capacity in ex
This stem 88 is held against axial displacement
cess of its requirements. _ That is, the one pump
by the handle 90 engaging the outer end ‘face of
must have a capacity large enough to ;supply
burners of widely varying sizes and thus a by-pass 20 hub I09 and by a snap ring I05, mounted in a
groove in stem‘ 80, engaging the inner end face
is necessary to take care of air not needed for the
of the hub. The described stop pin 93 is ?xed in
burner.
the ‘outer end of‘ hub I00.
.
I
The oil pump includes a cup-shaped rotor 8|,
The nut‘ IOI in ‘its inner end has a circum
the end wall of which is ?xed to the portion 26
ferential groove in which is ?xed a snap ring
of the pump drive shaft. This rotor is mounted
I06. The purpose of this ring is to enable‘the
in and coaxially of a cylindrical chamber formed
cover‘ 5!, which sticks tightly in place because of ,
in housing member 23 and closed by end plate 64.
the packing rings 50 and I03, to be positively
A hole extends diametrically through the annular
pulled ‘off when nut ml is unscrewed, the snap
wall of the rotor, forming two cylinders 82. A
ring abutting the shoulder I01 on the cover for
single rod 83 extends diametrically of the rotor
this purpose. ‘This avoids the necessity‘for the
and is slidably engaged as a piston in each cyl
inder 82. Fixed to the rod 83 at a location cen
use of prying tools, such as screw drivers or
chisels, and the possible damage incident to their
Vtrally between its ends isa cylindrical member
34 which lies within the open, cup-like end of
In the use of the‘invention‘ in connection with
the rotor and may, by adjustment, be positioned 55
an oil burner of the airi-atomizing type,-the fan 13
eccentrically or coaxially of the rotor. In the
use.
outer end face of the member 84 is adiametrical
slot 85 which slidably receives a square block 86.
Engaged in this block is a round pin 81 which is
‘fixed eccentrically of and‘ on the inner end. of a
stem 88. In Fig. 6, _89 indicates the axis of rota
tion of stem 98. Byturning the stem counter
clockwise as viewed in Figs. 6 and 7 by means of
the handle 90 provided on the stem, the ‘axis of
pin 81 may be moved from its position of maxi
mum eccentricity shown in Fig. 6 until its axis
9! coincides with the axis 92 of the pump 'rctor
9!. Thus, the capacity of the pump may be
varied from a maximum to zero by increments
as small as desired. A stop pin 93 (Fig. ‘7)
limits the movement of handle 90 by abutment
with shoulders 94 on the handle to the limits
described. As the rotor 8| rotates counterclock
wise as viewed in Fig. 6, the‘outer end of one
of the cylinders 82 (the upper one) will com- '
municate with the pump inlet port 66. This is an
arcuate groove which is formed in‘member 23
iii-encompassing relation with the pump rotor 0 I1.
_
I
supplies air from its housing I4 into one end? ‘of
a-tube I08 (Fig. 11), in the outlet of which is
arranged‘ a body I09, carrying the‘ ‘nozzle ‘ H0.
The air and oil discharge ports 44 and 99 of the
supply unit are respectively connected by‘ pipes
III and H2 to passages‘lldand II4 (Fig. 12>;in
the body I09. ‘ Fastened'to the forward end of
the body‘ I09 as by a cap IIEi,_screwed on to the
body, is a nozzle body I I6, having a frusto-conical
outer end and a member II'I, having a comple
mentary shaped part to engage said end and hav
ing the nozzle ori?ce H0. The nozzle body H6
has a central oil discharge passage I I8 communi
cating directly with passage H4. Formed be—
tween the abutting end of the bodies I08 and H6
is an‘ annular passage H9, receiving air from
‘passage I I3 and discharging it through two longi
tudinal passages I20 in body H0. The passages
Hi5 connect one with each of two slots I2I (Fig.
13), the ‘inner ends of which open tangentially
into a whirl chamber I22, formed between the
mating frusto-co-nical parts H6 and Ill (Fig.
12) and surrounding the’ frusto-conical end of
out from its piston, creating a partial vacuum 60 the oil nozzle. Air entering through slots I2! ‘is
whirled around in chamber‘ I22 and issues‘ from
to draw in oil and fill the cylinder. Meanwhile,
nozzle I20‘in a whirling stream, surrounding the
the other cylinder which had previously been
oil stream.
‘
?lled, is brought into communication with the
‘In operationon a call'for heat from the burner,
outlet port 95, which is formed similarly to port
the electric motor is started in any suitableway,
66 but on the opposite side of the rotor. As the
usually automatically in response to a thermo
rotor turns, the lower cylinder moves‘ in on its
stat. The fan 3 is driven with the motor and is
piston to force out the oil into the outlet port 95.
?rst brought well up towards its maximum speed
The outlet port 95 is connected by a radial pas
As the rotor turns the upper‘ cylinder 82 draws
sage 96 (Fig. 9) to one end of a passage 91
which extends longitudinally through member
23 and a substantial distance into end plate I2
where it connects with a radial passage 98, lead
ing to a tapped hole 99 in plate I2. This hole 99
before the speed-responsive coupling operates to
connect the pump and motor shafts IT and B and
drive the oil and air pumps 2 and I, respectively.
This allows time for the scavenging of the air tube
I08, the combustion chamber to which it delivers,
and the several passes and flues of the heating
is adapted to receive the oil pipe leading to the
75 apparatus. Secondary air, at a su?lcient rate
nozzle of the oil burner.
72,409,477
7
to secure good ‘combustion, :is available at the
--burne.1- nozzle before the pumps I and 2 are
started. Even then actuation of the oil pump
"2 is>inelfective until the air-pump I has ?rst built
up the necessary pressure to insure a supply of
8
and two control valves and the rate-varying
means for the oil pump.
Iclaim:
1. Apparatus for supplying air and oil to a
:burner, comprising, a positively-acting displace
ment pump for supplying air, inlet and discharge
conduits for said pump including in the dis
primary air at the necessary rate to the atomizing
inozzle. Then, the .oil valve 5? opens to allow ?ow
‘ofioil to the nozzle. On stopping of the burner,
charge conduit, a chamber, a wall in said cham
the electric motor is deenergized and, after its
ber movable by ‘pressure of the pumped air, a
speed diminishes to a certain point, the speed 10 pump vfor supplying oil, a cut-oil? valve prevent
:responsive coupling disconnects pumps I and 2,
ing ?ow of oil to the oil pump, a by-pass from
‘whereby the .oil '?owwill be quickly cut o?" by the
the pressure to the suction side .of the air pump,
"drop in "pressure of the primary air. The flow of
a valve controlling said by-pass, and means
.oil'tozthe tburner nozzle is thus stopped ahead of
actuated ‘by said movable Wall for opening said
‘the '?owzof primary air to avoid poor combustion.
cut-01f valve when a predetermined air pressure
'The fan ‘3 continues in operation after both
has been built up in said chamber and for sub
pumps 1 .and 2 have stopped in order to scavenge
sequently opening the by-pass valve when the
the burner.
pressure in said chamber exceeds said prede
lt'will he noted that thesize of the air passages
termined pressure.
in the atomizing nozzle ‘will determine the rate 20 '2. Apparatus for supplying air and oil to a
of air flow ‘when the predetermined pressure of
burner, comprising, a positively— cting displace
:air has ‘been established by the pump I. Then,
ment pump for supplying air, inlet and dis
and only then will now of oil to the burner be
charge conduits for said pump including in the
permitted. The oil rate ‘is conveniently regulable,
discharge :conduit, a chamber, a Wall in said
even while the pump is 1in operation, by means '. chamber movable by pressure of the pumped air,
1.0.1’ "the ,mem-ber‘SG. The latter is located outside
a variable-capacity positively-acting displace
"the ‘casing 51 which encloses 'all the rest of the
.ment pump forsupplying oil, ‘inlet and discharge
apparatus and ‘may be turned by as small incre
conduits for the oil pump, a cut-01f valve asso
ments as may be desired to 'Vary the capacity of
ciated with one of the oil conduits, a by-pass
'the‘oil pump from zero to the selected maximum.
from .the pressure to the suction side of the air
The ginventionprovides a compact arrangement
pump, a vvalve controlling said by-pass, and
of parts enabling both pumps together with the
means actuated ‘by said movable wall for open
‘necessary valves, a screen, a ?lter, controls and
ing said cut-off valve when a predetermined air
conduits to be provided on the end plate of the
pressure has been built up in said chamber and
driving motor within a casing, forming an oil
for subsequently opening the by-pass valve when
supply chamber. ‘The arrangement'of the cham
the pressure in said chamber exceeds said pre
bers 34 and 42, either or both, in one side of the
determined pressure.
end plate or body member l2 and the air-pump
3. In apparatus of the class described, a body
chamber in the other side of the member is
member having in one end a cylindrical air
thought to be important. The ?lter and air pres
pump chamber and in the other end a coaxial
sure chambers 34 and 42 are arranged on oppo
bearing, said body member including a part for
site sides of the bearing I5 and in closely adjacent
closing said chamber and having therein a cylin
relation therewith. These chambers 34 and 42
drical oil-pump chamber, a pump rotor in each
have end walls which each overlap in part the air
said chamber, a shaft mounted in said bearing
pump chamber and the passages 33 and 4| are ‘P’
and driving both rotors, said member having
provided through the overlapping portions of the
between the second end and the air-pump cham
adjacent end walls of the chambers. The ?lter
ber a cylindrical pressure chamber having an
and pressure chambers lie between the same two
end wall vin parallel partially-overlapping and in
transverse planes. One of these planes coincides
closely adjacent relation with the adjacent wall
with a plane in which one end of bearing I5 is of the air-pump chamber, a movable wall in the
located and the other of which ‘lies ‘between the
pressure chamber, said member having a con
two planes in which the ends of bearing l5 are
duit interconnecting the overlapping portions of
located. The inlet and outlet passages 3| and 1H
said adjacent end walls, an outlet from the
of the air pump may thus be made very short and
pressure chamber and a by-pass extending from
straight. The by-pass for the air pump is also in Ll the pressure chamber along and closely adjacent
made as short as possible by extending it along,
the peripheral wall-of :the air-‘pump chamber and
and closely adjacent, the periphery of the air
entering the latter ‘through its other end wall,
pump I from the pressure chamber 42 to the more
an oil conduit connected with the oil-pump
remote end wall of the air pump. Also, both the
chamber, a valve in the oil conduit, and a valve
air by-pa-ss valve 78 and oil cut-off valve :67 are
in said by-pass, 'both said valves located coaxi»
located in coaxial relation with the movable wall
ally of said pressure chamber and connected to
or piston 45 of the pressure control device.
said movable wall to be actuated thereby.
Radially, all parts are kept within reasonably
small limits in view of the provision of two pumps
WARREN H. DE LANCEY.
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