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Патент USA US2130337

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Sept. 20, 1938.
Filed Aug. 5, 1935
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Sept. 20, 1938.
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FiledvAug. 5, 1935
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2 Sheets-Sheet 2
Patented Sept. 20, 1938
Edward Trezise Bunt, Redcliffe, Bristol, England,
assignor of one-half to Frank Edwin John Hill,
Bristol, England
Application August 5, 1935, Serial No. 34,768
In Great Britain August 11, 1934
2 Claims.
(Cl. 261———90)
This invention relates to carburetors for in
and may if necessary be recessed at one side to
ternal combustion engines, its chief object being
to promote the atomization and vaporization of
enable the ?oat chamber to be placed in jux
taposition to- the said portion C, the cowl being
the fuel (petrol, oil, para?in, or the like), and a
subsidiary object being to enable the carburetor
to act as an automatic supercharger in motor
In order that the said invention may be clear
ly understood and readily carried into effect, the
10 same will now be described with reference to
the accompanying drawings illustrating exem
plifications of the invention.
Figure 1 is a side elevation of a carburetor.
Figure 2 is an elevation of the other side of
" the same carburetor with the cowl and front por
tion both removed.
in practice in a position overlapping the expan
sion chamber, that is, further forward than the UT
position in which it is shown for the sake of
clearness. The cowl is located at the rear of
the expansion chamber and over the carburetor
to receive hot air from the vicinity of the ?ns
of the radiator in a motor Vehicle and deliver
it to the carburetor, so that whilst avoiding the
eifect of back draught due to the speed of the
vehicle, the velocity of the air stream supplied
to the carburetor increases as the speed of the
vehicle increases, and the flow of fuel is also in
creased, so that the device is not merely an ex
Figure 3 is a rear view.
tra air device, but operates as an automatic su
Figure 4 is a front view of the rear portion. of
the carburetor with a transverse rotatable gauze
of the cup-shaped members A and B are screw
20 screen in position.
Figure 5 represents gauze screens of modi?ed
form alternating with vanes or propeller blades
to- be located on a pin extending longitudinally
of the expansion chamber.
Figure 6 is an underside View illustrating al
ternative means for moving the outer perforated
tapered ring.
Figure 7 represents in side elevation a modi
?cation in which the movable perforated member
is a cup inside the relatively ?xed member.
Figure 8 represents a longitudinal section
through the carburetor shown in Figure 7 taken
on the line 8——-8.
Figures 9 and 10 represent alternative modi
?ed means for controlling the fuel supply. _
Figure 11 is an end elevation and Figure 12 a
vertical section of a plug representing a further
Referring to Figures 1 to 4, the meeting faces
A indicates the front cup or portion of an ex
pansion chamber which is a bulb and may be
spherical or as shown of somewhat elongated
form, that is, approximately oval, and prefer
ably made in two separate halves or portions for
convenience in assembling or dismantling the ap
' paratus, having a. tubular extension a1 for con
nection to the engine manifold. B indicates the
rear cup of the expansion chamber, and C a
rearward cylindrical extension thereof which may
be called the choke tube, strengthened by a ring
50 111 and provided with an inlet pipe D into which
can be inserted a fuel jet (not shown) connected
with an ordinary or other float chamber. A
substantially hemispherical cowl E is secured in
any suitable manner outside the cylindrical por
55 tion C with its concave side forwardly directed,
threaded to facilitate assembly and dismantling.
A tapering or conical rear portion of the cup B
is perforated with three rows or rings of radially
directed holes of equal or graduated sizes and
outside this portion is a tapered or conical ring 25
F circumferentially movable in relation to the
cup B and perforated with corresponding rows
of holes f1, f2, is.
The holes of the rear-most
row f1 are preferably of larger diameter than
those of the other two rows. By graduated an 30
gular, that is, arcuate movements of the ring
F air can be admitted to the chamber through
one, two,~ or all of the rows of perforations in
the shell. The arcuate movements of the ring F
may be effected by a convenient controlling
means, but an example of a possible hand con
trol is given. A screw G having a milled head
91 works in a screw threaded bearing H secured
on the cup B, and its extremity is rotatably se
cured in a bearing 92 on the ring F (see espe
cially Figures 2 and 8) a spring 9'3 in compres
sion surrounding the shank of the screw G be
tween the two bearings H and 92.‘ Alternatively,
as seen in Figure 6 the smaller .end of the ring F
may have two recesses or notches in which stops
J engage, a spring K in tension being anchored
to the ring F and cup B and tending to hold
the ring F in the position relatively to the cup
in which the perforations in the ring are not in
register with those in the cup, an arm M on
the ring adapted to be set by any suitable con
trols placing the respective perforations in reg
ister to the desired extent. If the air inlets
are entirely closed then liquid fuel is drawn into
the expansion chamber by suction. A rotatable
rod P terminating in a milled head Pl passes
through the centre of the extension C and car
ries at its front end a disc in which are a num
ber of perforations adapted to be brought into
register with similar perforations Q (see Fig
ure 4) in a relatively ?xed disc adjacent the
base of the cup B. A fan or screen of wire
gauze consisting of four wings (only two of
which R and R1 are shown) directed 90 degrees
10 apart from each other and secured on a. spin
dle r1 may be mounted in bearings r2 in the cup
B in such manner as to be capable of rotating
freely in an inclined plane or in a horizontal
or in a vertical plane according to the positions
15 of the bearings. Alternatively a spindle 1'3 may
be ?tted into a hole in the centre of the base
of the cup B to occupy a longitudinal position
in an expansion chamber formed by the cups A
and B, and on this spindle are placed a series
20 of transverse wire gauze discs or screens T4, in
termediate of which are rings of vanes or pro
peller blades S, mounted on the spindle r3 in a
freely rotatable manner, the screens being also
rotatably mounted if desired. The screens are
25 especially useful in dealing with fuel of poor
The screens can be varied in number
and texture according to the grade of fuel used.
Referring now to Figures '7 and 8, in this em
bodiment a perforated inner shell or cup T is
30 movable in a relatively ?xed perforated outer cup
B. The petrol jet D2 enters a hole D1 bored
through the parts B and C. The fuel passes
through one of a number of perforations in a
disc 11,6 on the front end of the rotatable rod or
spindle P, and through a perforation Q (Figure 8)
in the end of the choke tube cylinder C. A series
of disc screens r4 may be placed within the ex
pansion chamber on a spindle 1'3 which is piv
oted on a rod r5 passing through the cup T. The
rod r5 is circumferentially movable in relation
to the outer shell B, as it works in slots r6 at
opposite sides of the shell B, these slots being cir
cumferentially directed in the shell B to allow
such movement of the rod T5, and as the said rod
is rigidly connected with the inner shell T, rela
tive rotary movement can be given to the shell T
within the shell B. Both the shell B and the
shell T are perforated with rings of holes f’, f2, f*,
of varying numbers, sizes, and spacing, and by
relative rotation a greater or less number of holes
in the different rings in the shell T can be brought
into register with the corresponding holes in the
shell B, and thus the total area available for the
admission of air to the expansion chamber within
the shell T can be regulated.
The rod 1'5 may be
provided with washers, collars, or anti-friction
bowls T", r8 to facilitate its smooth working, and
a spring r9 may be compressed against the washer
r8 to prevent slackness.
The control of the admission of the fuel to the
expansion chamber may be effected by means of a
slide having a rectilinear movement instead of by
a rotary disc as already described. The slide W,
Figure 9, is suitably guided across the forward
65 end of the. choke tube or extension C, a wire Z011
being provided to lift the slide against the re
sistance of a spring 202 in a casing at the top of
the slide, and a suitable stop being provided to
limit its downward movement under the impulse
70 of the spring when released. The slide has holes
or ports to3 and w4 of different sizes. The larger
hole is gradually closed off from the choke tube
or expansion C by the movement of the slide
before the smaller one comes into operation.
Figure 10 illustrates in vertical central section
another modi?cation in which the control of the
admission ,of fuel is effected by means of a rod Y
arranged transversely in the choke tube C and
passing through a bushing c1 in the said tube,
this rod having a perforation which in the posi
tion shown coincides with the bore of the bush
ing. The rod Y can be rotated by any convenient
external means to close the bore wholly or partly.
The rear end of the tube is closed by a screw
cap 02.
The alternative choke tube C illustrated in
Figures 11 and 12 is a cylindrical plug having a
screw threaded inlet D for the attachment of a
pipe (not shown) for conveying liquid fuel from a
?oat chamber or other source of supply, this inlet 15
D communicating with an eccentric bore 03 in
which is a roll of wire gauze 04. The opening of
the bore 03 towards the expansion chamber is
covered by an approximately semi-circular plate
Z. The fuel is drawn by the engine suction 20
through the bore 03 and creeps under the plate Z,
being then drawn in a ?nely atomized state into
the expansion chamber.
It will thus be seen that a carburetor accord
ing to the invention comprises an expansion 25
chamber between the fuel jet and the engine,
means permitting fuel to be drawn at a consid
erable pressure and speed through an aperture
or apertures and instantly released in a vaporized
or finely, divided form into the relatively large 30
space within the expansion chamber at a low pres
sure, and means to- admit into said chamber a
relatively large quantity of air directly from the
atmosphere in separate streams radially directed
through a large number of circumferential open
ings to impinge transversely on the stream of
fuel, whereby the diffusion of the fuel is im
proved and a more perfect combustion obtained,
whereby economy in the consumption of fuel re
sults with greater power.
Having now fully described my invention, I
1. In a carburetor for an internal combustion
engine to be used on a vehicle, an elongated ex
pansion chamber connected to the engine and 45
open to engine suction, means for delivering a
regulated stream of liquid-fuel into said cham
ber, the shell of said chamber having a large num
ber of relatively small circumferential openings
located between the engine and the point of 50
entry of the fuel, said openings serving to admit
directly from the atmosphere to said chamber all
of the air required for admixture with the fuel in
the form of separate streams impinging trans
versely on the stream of fuel being delivered, in 55
combination with a cowl placed behind the fuel
and air admission devices with its concave side
facing in the direction of travel of the vehicle, for
the purpose of receiving heated air from the
radiator of the vehicle and directing said heated 60
air to the carburetor.
2. In a carburetor for an internal combustion
engine, in combination an expansion chamber
connected to the engine and open to engine suc
tion, exterior means for delivering a regulated 65
stream of finely diffused liquid fuel into said
chamber, the shell of said chamber having a large
number of relatively small circumferential open
ings of rings and arranged in a plurality located
between the engine and the point of entry of the 70
fuel, said expansion chamber also being located
between the engine and the point of entry of the
fuel and said openings serving to admit directly
from the atmosphere to said chamber all of the
air required for admixture with the fuel in the 75
form of separate streams impinging transversely
rations being so arranged that by graduated angu
on the stream of fuel being delivered, and con
lar movements of said ring member one or more
trol means being provided between the engine and
the point of entry of the fuel for controlling said
circumferential openings including an angularly
of said rings of openings can be closed to reduce
the rate of admission of air to the interior of said
movable control ring member having perforations
adapted to register with said openings, said perfo
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