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Патент USA US3062241

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Nov. 6, 1962
s. WOODS
3,062,231
CARBURETOR FLOAT VALVE
Filed Sept. 27. 1960
S 7'EPHE/V 14/0003
INVEN TOR.
United States
@Q
3,052,231
Patented Nov. 6, 1962
1
2
3,062,231
in notches 23 provided in the sides of the housing '11.
A tab 26 integral with the ?oat lever 27 extends from the
pivot 24 to overlay and contact the fuel inlet needle
CARBURETOR FLOAT VALVE
Stephen Woods, Detroit, Mich., assignor to Ford Motor
Company, Dearborn, Mich., a corporation of Dela
valve. Float lever 27 extends in an upward direction and
then in a direction opposite to the tab 26 from the pivot
24 to overlay and contact by sections 28 and 29 ball
ware
Filed Sept. 27, 1960, Ser. No. 58,674
5 Claims. (Cl. 137-423)
?oats 17 and 14 respectively.
}
Ball ?oats 14 and 17 are of di?erent displacements.
This invention is concerned with carburetors and more
They may be made from metal, plastic or any other ma
speci?cally with novel ?oat means for maintaining a stable 10 terial which is unaffected by fuels. Ball ?oat 14 exerts a
fuel supply level in a carburetor ?oat chamber.
smaller upward force but has a longer lever arm, whereas
A ?oat control is necessary to maintain a predetermined
ball ?oat 17 exerts a greater upward force but has a
fuel supply level in the carburetor. Forces acting upon
shorter lever arm. The moment of the force exerted by
the fuel in the ?oat chamber traceable to uphill and
ball ?oat 14 is the same as the moment of the force ex
downhill travelling, cornering, jack rabbit starting and 15 er-ted by ball ?oat 17. It is also possible to vary the up
spike stopping, among other things, result in fuel surges
ward moment of force, that is; have a moment of force
in the ?oat chamber or bowl. Severe surges cause the
greater with one of the ?oats than the other of the ?oats
?oat to drop and open the fuel inlet needle valve thereby
Without losing control over the inlet needle valve opera
permitting the fuel pump to pump more fuel through
tion. Either one of the ball ?oats can support the lever
the fuel inlet needle valve into the ?oat chamber. If a 20 arm 27 so that the fuel level 31 will remain constant.
multiple ?oat is used, the ?oat unsupported by the buoy
When the engine is in operation, fuel from ?oat cham
ber 12 is moved by atmospheric pressure to pass through
jets 32 through passageways 33 into the carburetor fuel
ant force of the fuel Will operate as a weight on the sup
ported ?oat thereby lowering the supported ?oat to admit
more fuel into the ?oat chamber.
system in the conventional manner.
This additional fuel may unduly enrich the fuel to air 25
If fuel surge takes place, contact between one of the
ratio. As a result, engine performance is affected dele
ball ?oats 14 or 17 with its respective portions 29 and 28
teriously and excessive fuel consumption is the rule.
Industry has been long cognizant of this problem and
attempts have been made. to solve it in various and sun
dry ways. Typical. of the endeavors of the prior art to 3 CD
solve this problem are US. Letters Patent 2,655,359 is
sued October 13, 1953 to A. H. Winkler and US. Letters
of the ?oat lever is discontinued by virtue of loss of su?i
cient fuel to keep the ?oat in suspension and in contact
with its respective ?oat lever section. The ball ?oat con
sequently falls away from the ?oat lever contact without
adding to the weight which the other ?oating ball ?oat
must carry. Hence, the fuel level is not a?ected. By
Patent 2,818,879 issued January 7, 1958 to J. T. W.
Moseley, et al. After considerable testing, the structure
of the instant invention has been found to be highly 3
having ball ?oats of di?erent displacements, the ball ?oats
are less susceptible to ?oat vibrations thereby preventing
The precise solution proposed by the inventor can
best be understood by a study of the drawings in which:
when engine roughness is severe.
‘In FIGURE 3 it is possible to eliminate the point con
tact of the projections with the ?oat. For example, in
satisfactory.
FIGURE 1 is a plan view of a portion of a carburetor
fuel level creeping and carburetor ?ooding during speeds
FIGURE 3 a cross section of the housing 34 is shown in
?oat chamber in which the ?oat chamber cover has been 40 which a ?oat 35 is located. Float 35 is provided with a
removed;
recess 36 in which a ?oat lever portion 37 is positioned.
FIGURE 2 is a cross section taken on the plane indi
The novel ?oat system is adaptable to many variations
cated by the line 2-2 of FIGURE 1; and
such as different vertical projection con?gurations which
FIGURE 3 is a fragmentary transverse section taken
may also differ in number and placement, ball ?oat con
through the carburetor ?oat chamber and showing an 45 ?gurations, ball ?oat size, displacements, and material.
alternate construction.
It will be understood, therefore, that the invention is
A portion of the carburetor ?oat chamber is indicated
not to be limited to the exact construction shown and
generally at 10 and comprises the usual housing 11 that
described but that various changes and modi?cations may
de?nes a ?oat chamber 12. At one end of the ?oat cham
be made without departing from the spirit and scope of
50
ber 12 are vertical projections 13 integral with the hous
the appended claims.
ing 11. These projections 113 de?ne a restricted vertical
I claim:
path in the ?oat chamber ‘12 for ball ?oat 14. As can
1. A carburetor comprising a housing de?ning a ?oat
be seen in FIGURE 1, ball ?oat 14 is restricted in its
chamber, a fuel inlet needle valve positioned in said hous
lateral movement by the projections 13 but is unrestricted
ing to control the passage of fuel into the ?oat chamber,
in its vertical movement except for rolling friction re
?oat lever means pivotally mounted upon the housing,
sulting from point contacts with the projections 13.
At the opposite end of the ?oat chamber 12 are addi
said ?oat lever means having a tab overlaying and in con
tact with the fuel inlet needle valve on one side of the
tional vertical projections 16 that are also integral with
pivot mounting and a portion on the opposite side of the
the housing 11 and likewise provide a vertical path for a
pivot mounting to the tab overlaying the ?oat chamber,
60
larger ball ?oat 17.
a pair of spaced apart ?oats underlaying said portion
Incoming fuel from the fuel pump (not shown) is
and detached from said portion but in contact therewith
pumped through the fuel inlet 18 in the housing 11 and
when supported by a column of fuel, said ?oats at differ
through an internal passage (not shown) to the fuel inlet
ent distances from the pivot axis of said pivotally mounted
needle valve seat 19. A fuel inlet needle valve 21 co
operates with the fuel inlet needle valve seat 19 to con
65 ?oat lever means, means restricting the movement of said
?oats to a vertical direction, said ?oats having a com
bined upward moment of force when supported by a
column of fuel in excess of the moment of force required
to close the fuel inlet needle valve.
respect to the fuel inlet needle valve seat 19 is accom_ 70
2. A carburetor comprising a housing de?ning a ?oat
plished through a ?oat lever 27. Float lever 27 is pivotally
chamber, a fuel inlet needle valve positioned in said hous
mounted at 24 to shaft 22 that rests on its terminal ends
ing to control the passage of fuel into the ?oat chamber,
trol the amount of fuel entering the ?oat chamber 12.
This construction is conventional.
The positioning of the fuel inlet needle valve 21 with
3,062,231
and in contact with the fuel inlet needle valve on one side
of the pivot mounting and an additional portion on the,
opposite side of vthe pivot mounting to the tab portion
overlaying the ?oat chamber, a pair of spaced apart ?oats
underlaying and detached from said additional portion
but in contact therewith when supported by a column of
fuel, said ?oats at different distances from the pivot axis
of said pivotally mounted ?oat lever means, means re
stricting the movement of said ?oats to a vertical direc
4
each of said ?oats being disposed at different distances
from the pivot axis of said pivotally mounted ?oat lever
means, each of said ?oats having different displacements,
?oat lever means pivotally mounted upon the housing,
said ?oat lever means having a tab portion overlaying
means restricting the movement of said ?oats to a vertical
‘direction, each of said ?oats exerting the same upward
moment of force when supported by a column of fuel,
each of said ?oats exerting an upward moment of force
, sufficient to close the fuel inlet needle valve.
5. A carburetor comprising a housing de?ning a ?oat
10 chamber, a fuel inlet needle valve positioned in said hous
ing to control the passage of fuel into the ?oat chamber,
?oat lever means pivotally mounted upon the housing,
tion, said ?oats each exerting a different upward moment,
said ?oat lever means having a tab overlaying and in con
force and having a combined upward moment of force
tact with the fuel inlet needle valve on one side of the
when supported by a column of fuel in excess of the
moment of force required to close the fuel inlet needle 15 pivot mounting and a section on the opposite side of the
pivot mounting to the tab overlaying the ?oat chamber,
valve.
a pair of spaced apart ?oats underlaying and detached
13. A carburetor comprising a housing de?ning -a ?oat
from said section but in contact therewith when supported
chamber, a fuel inlet needle valve positioned to control
by a column of fuel, said ?oats at different distances
the passage of fuel into the ?oat chamber, ?oat lever
from the pivot axis of said pivotally mounted ?oat lever
means pivotally mounted upon the housing, said ?oat lever
means, said housing having projection means restricting
means having a portion in contact with the fuel inlet
the movement of said ?oats to a vertical direction, said
needle valve on one side of the pivot mounting and
?oats having a combined upward moment of force when
an additional portion on the opposite side of the pivot
supported by a column of fuel in excess of the upward
mounting overlaying the ?oat chamber, a pair of spaced
moment
of force required to close the fuel inlet needle
apart ?oats underlaying and detached ‘from said second
valve.
mentioned portion but in contact therewith when sup
ported by a column of fuel, said ?oats at different dis
References Cited in the ?le of this patent
tances from the pivot axis of said pivotally mounted ?oat
UNITED STATES PATENTS
lever means, each of said ?oats exerting va moment of
force su?icient to close the fuel inlet needle valve when 3O 1,758,068
Win?eld ____________ _- May 13, 1930
supported by a column of fuel, and means on said hous
ing restricting the movement of said ?oats to a vertical
direction.
4. A carburetor comprising a housing de?ning a ?oat
chamber, a fuel inlet needle valve positioned in said 35
housing to control the passage of fuel into the ?oat cham
ber, ?oat lever means pivotally mounted upon the housing,
said ?oat lever means having a tab portion overlaying
and in contact with the fuel inlet needle valve on one side
of the pivot mounting and an additional portion on the
opposite side of the pivot mounting to the tab overlaying
the ?oat chamber, a pair of spaced apart ?oats underlay
ing and detached from said second mentioned portion but
in contact therewith when supported by a column of fuel,
1,802,135
2,461,274
2,600,366
2,655,359
2,717,771
2,818,879
Carter ______________ __ Apr. 21,
Heintz ______________ __ Feb. 8,
Sloane ______________ __ June 10,
Winkler _____________ __ Oct. 13,
Richardson __________ __ Sept. 13,
Moseley ______________ __ Jan. 7,
1931
1949
1952
1953
1955
1958
FOREIGN PATENTS
514,398
640,283
760,538
895,283
Belgium ____________ __ Oct.
Germany ____________ __ Apr.
Germany ____________ __ Dec.
France _____________ __ Mar.
15,
25,
15,
27,
1952
1935
1952
1944
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