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Патент USA US2124504

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July 19, 1938.
M. BROWN
2,124,504
CARBURETOR- CHOKE CONTROL MECHANISM
Filed June 29, 1957
Zé
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INVENTOR.
M02241 6’. EEO/40v
ATTORNEY.
2,124,504
Patented July 19, 193$
UNITED STATES
PATENT OFFICE
I 2,124,504
CARBURETOR CHOKE CONTROL
MECHAN!
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. Morris Brown, Detroit, Mich. ‘
Application June 29, 1937, Serial No. 150,956
10 Claims. (or. 123-119)
This invention relates to carburetors for inter
nal combustion engines and consists particularly
in novel means for controlling thermostatic choke
operating mechanism.
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'
shown) for maintaining fuel therein at a sub
stantially constant level. Fuel‘ from bowl I0 is
supplied to the mixture conduit through main
nozzle l I and idling passage l2 discharging adja
An automatic choke carburetor of the usual
type for automobile engines is provided with a
thermostat for in?uencing the choke valve and
some means for heating the thermostat in cor_-'
respondence to the temperature of the engine
manifolds and ?ring chambers. Frequently this
is accomplished by means of a stove orheating
chamber secured to the exhaust manifold or
other convenient part and connected to the ther
mostat housing by tubing for conducting heated
cent the throttle valve.
Y
_
this must be connected with the thermostat hous
ing by a substantial length of tubing which com
plicates assembly of the automatic choke mecha
Patent No. 2,085,351 except that in the present
nism and results in loss of heat.
stead of on the air horn.
Another object is to provide a carburetor and
manifold construction which includes the ther
mostat heating means as a unitary part thereof,
thus eliminating the separate stove heretofore
grally with the exhaust manifold 21, a portion
Choke valve ‘I is controlled, for cold starting
and warm up purposes, by mechanism including
a housing 13 enclosing a spiral, bi-metal thermo
stat I 4 and the small cylinder l5 slidably receiv
ing piston l6. Coil ‘I4 is secured at its inner 10
end to a pintle l'l projecting from the housing
wall and at its outer end has a hook l8 receiving
a lateral ?nger IS on a crank 20 pivotally carried
by the housing and rigid with an arm 2| between
the housing and mixture conduit. Arm 2| is
‘ gases from the stove to the housing. Exposing
the thermostat housing and stove to suction in connected to choke lever 22 by a rod 23.
Cylinder I5 communicates with the interior of
the'intake manifold has also been suggested in
order to, insure an adequate ?ow of heated gases‘ the mixture conduit posterior to throttle 9 by
' past the thermostat. In such case, air adjacent means of ,a suction connection 24. Longitudinal
grooves 25 in the wall of cylinder l5 provide for ‘_
the engine, which may contain oil or dust par
transmission of a portion of the suction to the
ticles or other impurities, is drawn into the hous
ing and engine ?ring chamber and may foul the interior of housing l3. The described choke con
thermostatic mechanism and suction connections. trol mechanism corresponds substantially with
Moreover, where a separate stove is provided that more fully described and claimed in Coffey
instance the thermostat housing is ‘mounted ad
jacent the outlet portion of the carburetor in
For the purposes of >
.An object of the present invention is to provide the present invention, the thermostatic housing
means for supplying relatively clean, heated air I may be located in any convenient position.
The intake manifold 26 is shown formed inte
to‘ the thermostat housing.
‘
used.
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These objects and other more detailed objects
hereafter appearing are attained by the structure
illustrated inwhich.
40
’
The ?gure is a sectional view of a carburetor
Showing portions of the automatic choke mecha-,
nism and engine manifolds.
The carburetor shown is, in general,' of well
known form having a downdraft mixture conduit
46 including an air inlet horn l, venturis 2, ‘and
outlet portion 3 flanged, as at 4_ for attachment
by‘means of bolts 5 to the riser or “hot spot"
portion 6 of the manifold construction. A_ but
ter?y choke valve 1 is mounted in the air horn
on
shaft 8 and a throttle valve 9 is pivoted adja
50
cent the outlet portion of the carburetor. An air
cleaner 9 of any suitable construction is secured
'to the air inlet horn.
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Adjacent the mixture conduit is a bowl“ hav
55 ing the usual ?oat operated mechanism (not
of the latter extending around the riser portion
28 of the intake manifold, as at 29, to form the
usual “hot spot’.’ construction. Also formed inte
grally with the hot spot construction is‘a cham
ber 30 which is sealed from the interiors of both
the intake and exhaust ‘manifolds. ' A longitudi
nal ori?ce 3|, formed in the wall of the carburetor
mixture conduit, communicates at its upper end
with ‘the air inlet portion of the conduit and, at
its lower end, ‘connects with chamber 30 through
passage 3la in the riser portion. A portion of
chamber '30 spaced from passage 3| has a 'con
nection 32, 320. with the interior of thermostat
housing l3. Thus suction applied to the interior
of housing l3 draws heated gases from the car
buretor air horn through heating chamber or
stove 30 into the housing. ‘All such heated gases
are ?rst strained through the air cleaner for
removing impurities.
By means of the illustrated construction, the
' entire carburetor including the automatic choke
control mechanism is formed as a compact unit
and also the‘ heater and manifolds are formed
2
’ 2,124,504
together. These structures may be assembled by
mérely bolting the carburetor ?ange to the mani
fold riser, passage 3|, 3m and 32 and 3Za,be
ing disposed to register properly. ~ Air strained
the gases supplied to said stove are drawn from
said carburetor inlet.
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6. In an internal combustion engine, an in
take passage, an exhaust passage including a
through the air cleaner'is drawn into the ther
portion adjacent said intake passage for heating
mostat housing, which prevents the thermostat
the same, means forming a chamber in a wall of
mechanism and choke connections from being
fouled by impurities. This is an important fea
said exhaust passage, andlcarburetor choke con
trol mechanism including a thermostat housing.
ture in automobiles where the air under the hood
and a connection between said chamber and
is frequently contaminated with grit, oil, or dust.
In the present instance, the connection be
said housing-for supplying heated gases to said
tween the stove or heater chamber and the car
buretor inlet is formed as a longitudinal ori?ce
integral with the wall of the carburetor mixture
conduit and .the other heater and suction con
nections with the thermostatic housing are rela
tively short. Where the thermostat is mounted
adjacent the ainhom, these connections will nec-l
essarily be varied to correspond, it being contem
plated that wherever practical the passages will
housing.
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'7.’ In an internal combustion engine, intake
and exhaust manifolds, said intake and exhaust
manifolds having portions separated by a com
mon wall forming a hot spot construction‘for 15
applying heat to the engine intake passage, a
chamber in a wall of said, hot spot construction,
and carburetor choke control mechanism in
cluding a ‘thermostat housing and a connection
between said chamber and said housing .for
be formed in the carburetor walls. It maybe supplying heated gases to said chamber.
8. In an internal combustion engine, an intake
desirable to construct one or more of the heat
‘passage including a carburetor mixture conduit,
and suction connections as separate tubing.
The exclusive use of allgsuch modi?cations as a choke valve in said conduit, an exhaust pas
come within the scope of the appended claims is sage including a part contacting said intake pas 25
contemplated.
sage for heating the same, a stove associated with
said part, and choke control mechanism includ
Iclaim:
I
,
1. In combination; a carburetor including a ing a thermostat housing and connections for
drawing gases from the inlet portion of said mix
mixture conduit and a choke valve in said con
duit, and control mechanism for said valve in- v ture conduit through said stove and said housing
cluding a thermostat housing and means for sup
and back into said intake passage, at least one of
plying heated gases to said housing including a said connections being formed as alongitudinal
stove having an inlet connection into the interior ori?ce in the wall of said conduit.
9. Structure as speci?ed in claim 8 in which
of said conduit, and suction connections between
' said‘ housing and said stove and between said said thermostat housing is located adjacent the 35
housing and a portion of said conduit normally outlet portion of said mixture conduit, the con
at lower-operating pressure than said inlet .-con~ nection between said stove and the inlet portion
of said conduit extending along and-being formed
.
2. Structure as speci?ed in claim 1 further integrally with the wall of said conduit.
nection.‘
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including an_air cleaner through which all air to _
. 10. In an internal combustion engine, intake 40
and exhaust manifolds including hot spot con
said inlet connection must pass.
3. Structure as speci?ed in claim 1 further in ' struction, a portion of said construction compris
cluding a throttle valve in said mixture conduit, ing a heating chamber sealed from the interiors
of said manifolds, a carburetor including a. mix
said inlet connection and said suction connec
tions communicating, respectively, with portions ture conduit secured to said intake manifold ad .45
oi? said conduit anterior and posterior to said jacent said construction and having a choke’
valve, a connection between said chamber and
throttle.
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4:. In combination, a carburetor having an air the inlet portion of said conduit and formed in
inlet and a choke valve, and choke control mecha-, tegral with the wall of said conduit, choke control
mechanism including a thermostat housing, and 50
nism therefor- comprising a housing and a ther
' mostat therein, a stove arranged to supply heated connections between said housing and said heat
gases to said housing, and a connection between ing chamber and between said housing and a
said stove and said air inlet whereby a portion of relatively low pressure portion of ‘said conduit.
the air entering said inlet is heated in said stove. for drawing heated gases through said chamber.
MORRIS BROWN.
5. Structure as speci?ed in claim a in which all
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