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Патент USA US3061295

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Oct. 30, 1962
c. s. GARSKI ETAL
3,051,235
FUEL SYSTEMS FOR INTERNAL COMBUSTION ENGINES
Filed June 15, 1959
3 Sheets-Sheet 1
23
INVENTORS
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CHESTER $.GAR SKI
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Oct. 30, 1962
c. s. GARSKI ETAL
3,061,285 ,
FUEL SYSTEMS FOR INTERNAL COMBUSTION ENGINES
Filed June 15, 1959
3 Sheets-Sheet 2
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INVENTORS
CHESTER s. GARSKI
vARLTON C. P
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Oci- 30, 1962
c. s. GARSKI ETAL
3,061,285
FUEL SYSTEMS FOR INTERNAL COMBUSTION ENGINES
Filed June 15, 1959
3 Sheets-Sheet 3
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INVENTORS
CHESTER S. GARSKI
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United States Patent G cc"
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come apparent as the description proceeds, especially
3,061,285
FUEL SYSTEMS FOR INTERNAL
COMBUSTION ENGINES
Chester S. Garski, Detroit, and Carlton C. Phillips, Bir
mingham, Mich., assignors to Holley Carburetor Com
pany, Van Dyke, Mich, a corporation of Michigan
Filed June 15, 1959, Ser. No. 820,343
23 Claims. (Cl. 261-23)
v
Patented Oct. 30, 1962
when taken in conjunction with the accompanying draw
ings, illustrating preferred embodiments of the invention,
wherein:
FIGURE 1 is a top plan view of a carburetor embody
ing the invention and having its air cleaner removed.
FIGURE ‘2 is a side elevational view of the carburetor
illustrated in FIGURE 1, with portions thereof in cross
section taken substantially on the plane of line 2—2,
The present invention relates generally to fuel sys 10 FIGURE 1.
tems for internal combustion engines, and more spe
FIGURE 3 is a view similar to FIGURE 2 except that
ci?cally, to a carburetor and mounting structure therefor
the air cleaner is shown in place and the section is taken
including means for supplying air for idle operation of
substantially on the plane of line 3--3, FIGURE 1.
the engine.
FIGURE 4 is a bottom plan view of the carburetor
The usual carburetor of prior design delivers idle air to 15 shown in FIGURE 1, as viewed on the plane of line
the engine intake manifold by means of a partially open
4—4, FIGURE 2.
throttle valve. This method of supplying air for idle
FIGURE 5 is a bottom plan view taken on the plane
engine operation has proved to be unsatisfactory, especi
of line 5--5, FIGURE 3.
ally in those situations where the engine has not reached
FIGURE 6 is a fragmentary cross-sectional view taken
normal operating temperatures and the ambient tem 20 on the plane of line 6—6, FIGURE 4.
perature is low.
When a carburetor of this prior de
5
FIGURE 7 is an enlarged longitudinal sectional view
sign is idled in cold weather the moisture content of the
air drawn around the “cracked” throttle frequently con
of the carburetor hold-down and idle air adjustment
valve.
denses and freezes adjacent to and on the upper surface
FIGURE 8 is a longitudinal sectional view through a
and edges of the throttle valve due to the cooling effect 25 carburetor hold-down stud illustrating a second embodi
of the air ?owing past the throttle. The ice which is
ment of the present invention.
so formed may clog the idle fuel ports and cause engine
Referring now to the drawings, the carburetor indi
stalling.
cated generally at 10 comprises a body 12 having pri
Various designs of idle air bypass means have been
mary and secondary induction passages 14 and 16 re
proposed in order to eliminate this icing. Some of these 30 spectively, extending therethrough. The air intake 18
have been non-adjustable, constantly-open conduits which
mounted on the body 12 has a choke valve 20 therein
supply a quantity of air posterior to the throttle valve,
adapted to control the ?ow of air therethrough. A choke
while others have been of the adjustable variety. The
control device indicated generally at 22 is suitably con
constantly~open, non-adjustable bypass systems are not
nected to the choke valve in a manner well known in the
generally desirable because of possible variations in en 35 art. In the particular carburetor illustrated fuel meter
gine characteristics.
ing blocks 24 and fuel bowls 26 are sequentially secured
The adjustable systems heretofore proposed have not
to the body 12 by any suitable means such as screws 28.
been used because of the complexity of the design (es
The primary induction passages 14 are illustrated as
pecially in the multi-barrel multi-stage carburetors)
containing venturis 3i} and a main fuel nozzle 32 is
and the inaccessibility of the adjustment means. Almost
located generally within the throat of each venturi. An
all carburetors have air cleaners mounted thereon, and
idle fuel system is schematically illustrated by a port
the air cleaners have become lower and larger in diam
34 discharging posterior to the throttle valve 36 and
eter as a result of increased air demands and automotive
being in communication with the fuel bowl by means
styling. This has required that the air cleaner be re
of suitable conduitry including passage 38. The sec
moved any time adjustments of the idle air bypass were 45 ondary induction passages '16 have separate ‘fuel meter
desired.
ing systems, all elements therein which are the same as
Accordingly, it is an object of the present invention
those provided within primary fuel passages ‘14 being
to provide adjustable means for supplying idle air to the
identi?ed ‘by like reference characters. The idle throttle
engine, and more speci?cally, to provide readily acces
valve 40 however, is diiferent from the primary throttle
sible adjustment means for supplying idle air posterior 50 valve in that it may be controlled either manually in
to the carburetor throttle valve which may be adjusted
accordance with primary throttle position, or automati
without removing the air cleaner or other components
cally in accordance with engine requirements.
of the carburetor.
The primary and secondary throttles 36 and 40 are
It is a further object of the present invention to pro
illustrated as contained within a separate throttle body
vide mounting means for attaching the carburetor to the 55 42 which is secured to the carburetor body 12 by screws
intake manifold and for attaching the air cleaner to the
or the like (not shown). The entire carburetor assembly
carburetor, including separately releasable elements which
as so far described comprises the body 12, metering blocks
provide for separation of the air cleaner from the car
24,
fuel bowls :26, and throttle body '42, and this as
buretor and removal of the carburetor from the engine
sembly
is secured as a unit to the engine intake manifold
60
manifold as desired.
44 by structure which will subsequently be described in
More speci?cally, it is an object of the present inven
detail.
tion to provide a carburetor and air cleaner combination
comprising an attachment stud having a threaded por
tion engageable in a tapped recess in an engine manifold
to serve as the sole releasable connecting means for at
‘ taching the carburetor to the manifold, said stud hav
ing air passage means extending therethrough providing
for ?ow of idle air, an adjusting valve in said passage, a
tubular air cleaner attachment stud connected to said
Referring now more particularly to FIGURE 3 the
carburetor 1G is illustrated as provided with an air cleaner
65 46 which is mounted atop the carburetor.
The body 12
of the carburetor is formed to provide a cavity 48 therein,
this cavity being in communication with incoming air
by means of a port or conduit 50.
The throttle body
42 is provided with an opening 52 in alignment with the
carburetor, and an opening extending through said stud 70 cavity 48, the lower portion of this opening being counter
affording access to said adjusting idle air valve.
Other objects and features of the invention will be
bored to provide an enlarged chamber 53. Air admitted
to the chamber 53 by means subsequently to be de-'
3,061,285
3
scribed is conveyed to the primary and secondary in
duction passages 14 and 16 posterior to the throttle valves
36 and 40 through passages best illustrated at 53, 56 and
58 in FIGURE 4.
The carburetor body 12 is provided with a tubular
projection ‘60 having an opening therethrough in align
ment with the opening 52 extending through the throttle
valve body 42. Movable in the opening through the
4
driver may be inserted through the opening 92 into
engagement with the slot 102 to effect a required adjust
ment of the valve 98 into partly closing relationship to
the passages 96 as desired.
An annular externally threaded spring retainer 106
is provided in the interior threaded opening of the stud
62 to form a seat for engagement by the upper end of
the spring 104. The spring retainer 106 is annular to
permit passage of the screwdriver adjusting tool there
projection 60 and the opening 52 is a center hold-down
stud 62, the details of which will subsequently be 10 through.
Referring again to FIGURE 3 it will be observed that
described. The upper portion of the projection 60 is in
the opening 71 through the air cleaner attachment ex
ternally threaded as indicated at 64 and receives the
tension 68 is illustrated as of approximately the same
lower externally threaded portion of an air cleaner at
diameter as the reduced upper portion 81 of the stud.
taching extension 63. The extension 68 includes a shoul
Accordingly, a screwdriver tool having a blade dimen
der 70 engageable with the upper end of the internally
sioned to ?t approximately within the opening 71 will
threaded projection 60- and is provided with an axially
extending opening 7-1 therethrough. The extension 60
engage the screwdriver slot 82 and thus the center hold
down stud may be released so that the entire carburetor
cooperates with a nut 72 carried by an upper threaded
assembly and air cleaner may be removed from the
portion 74 of the extension to mount the air cleaner 46
20 manifold as a unit. Alternatively, a second screwdriver
on an air cleaner support ?ange 75.
tool having a smaller blade dimensioned to pass through
Referring now more particularly to FIGURES 3 and
the opening 92 in the stud, and more speci?cally through
7, the details of the hold-down stud 62 and its co
the annular spring retainer 106, may be inserted through
action with the remaining structure of the carburetor will
the opening 71 to effect a required adjustment of idle air
be described. The hold-down stud at its lower end is
threaded as indicated at 76 and above the threaded por
25 supply without disturbing the mounting of the carburetor
tion it is provided with an integral radial ?ange 78 hav
ing a downwardly facing annular shoulder 80. The up
or the air cleaner. Moreover, this adjustment when made
is permanent since the action of the spring 104 acting
between the valve 98 and the spring seat 106 is to prevent
per end of the stud is reduced as indicated at 81 and is
shifting of the valve from its adjusted position as a result
provided with a construction by means of which the stud
may be rotated, such for example as a screwdriver re 30 of vibration or other causes.
Referring now to FIGURE 8 there is shown a modi?ca
ceiving recess 82. In the assembly the ?ange 78 is re
tion of the invention in which the stud 62, instead of being
ceived in the chamber 48 of the carburetor body and
provided with a spring 104 and spring retainer or seat
bears against the upper surface of the throttle body 42.
106, is provided with a special threaded adjusting valve
The engine manifold 44 is provided with a flat mounting
surface 84 having a tapped opening 86 therein which 35 110. In this case the valve 110 may be of identical con
?guration with the valve 98 except that in a recess pro
receives the threaded lower end 76 of the stud. Spaced
vided in one side thereof there is inserted a plastic friction
from the tapped recess 86 the manifold is provided with
upwardly extending locating pins 88 adapted to be re
plug 112 preferably formed of nylon. This plastic plug
opposes a substantia'l frictional resistance to turning or
ceived in recesses 90 formed in the throttle body 42.
It will be recalled that the throttle body 42 is attached 4,0 adjustment of the valve 110‘ but not sul?cient to prevent
ready adjustment of the valve by the application of a
to the carburetor body 12 so that when the hold-down
screwdriver tool thereto. On the other hand, the friction
stud 62 is screwed into the opening 86 as illustrated in
supplied by the nylon plug is adequate to prevent acci
FIGURE 3, the entire carburetor assembly is located
dental shifting of the valve from its adjusted position.
on and positively attached to the manifold. This of
The drawings and the foregoing speci?cation con
course also provides means by which the entire carburetor
stitute a description of the improved fuel systems for
assembly may be removed from the manifold simply by
internal combustion engines in such full, clear, concise
unscrewing the stud 62.
and exact terms as to enable any person skilled in the
The center hold-down stud 62 is provided with means
art to practice the invention, the scope of which is indi
for supplying idle air to the air intake passages and
preferably, this idle air supply means is provided with
adjustable valve means as best illustrated in FIGURE 7.
It will be observed that in FIGURE 3, which is on a
smaller scale, the center hold-down stud is not illustrated
as provided with the adjustable valve means for control
ling the supply of idle air although this adjustable valve
means may be included if desired.
Referring now more particularly to FIGURE 7, which
is on a considerably enlarged scale, the stud 62 is illus
trated as having an internally threaded opening 92 ex
cated by the appended claims.
What we claim as our invention is:
l. A carburetor assembly having a vertical opening
extending completely therethrough, the opening having a
circumferential shoulder therein, a mounting stud having
a locating ?ange engageable with said shoulder for de
termining the position of said stud within said opening,
and a threaded lower end portion on said stud extending
below said assembly for fastening engagement with a
threaded recess on an engine manifold, the other end of
tending downwardly from the upper end thereof. Be 60 said stud having a tool engageable formation thereon, said
stud having an idle air passage extending from an inter
low the ?ange 78 the opening 92 communicates with
mediate portion thereof to the underside of said car
four radially extending passages 94 which communicate
buretor assembly.
with the enlarged chamber 53 provided at the underside
2. A carburetor assembly having a vertical opening ex
of the throttle body 42. At an intermediate portion of
tending completely therethrough, the opening having a
the stud 62 there are provided vertically elongated ra
circumferential shoulder therein, a mounting stud having
dially extending passages 96 affording communication
a locating ?ange engageable with said shoulder for de
between the interior of the chamber 48 in the carburetor
termining the position of said stud within said opening,
body 12 and the longitudinally extending opening 92.
and a threaded lower end portion on said stud extending
Located above the passages 96 is a threaded adjusting
below said assembly for fastening engagement with a
valve 93 the upper portion of which is provided with a
threaded recess on an engine manifold, the other end of
reduced extension 100 having a screwdriver receiving
said stud having a tool engageable formation thereon,
slot 102 and which also forms a pilot vfor a compression
said stud having an idle air passage extending from an in
spring 104 which operates to prevent movement of the
termediate portion thereof to the underside of said car
adjusting valve 98 from vibration or other engine op
buretor assembly, said stud being tubular and having an
erating conditions. It will be apparent that a screw
5
3,061,285
adjustable valve for said idle air passage threaded therein,
said valve having a formation at its upper end for en
gagement with a valve adjusting tool inserted through the
opening in said carburetor assembly from the top there
of and through the tubular stud.‘
3. A carburetor assembly having a vertical opening
@
tubular upper portion, and friction means associated with
said valve to prevent accidental displacement of said valve.
9. A carburetor assembly comprising a body having
air and fuel mixture passages therethrough and a central
extending completely therethrough, the opening having a
cavity in communication with atmosphere, and having
aligned openings above and below said cavity, an attach
ment stud having a locating ?ange in said cavity engage
able with the portion of the body surrounding the lower
opening, the lower opening being enlarged at its lower
circumferential shoulder therein, a mounting stud hav
ing a locating ?ange engageable with said shoulder for
determining the position of said stud within said opening, 10 end to form a chamber in communication with said air
and a threaded lower end portion on said stud extending
and fuel mixture passages, said stud having an idle air
below said assembly for fastening engagement with a
passage extending ‘from said cavity to said chamber,
said stud extending into the opening above said cavity
threaded recess on an engine manifold, the other end
of said stud having a tool engageable formation thereon,
said stud having an idle air passage extending from an
intermediate portion thereof to the underside of said
and having a tubular internally threaded upper portion, a
threaded adjustable valve in said portion controlling idle
air flow between said cavity and chamber, said valve
carburetor assembly, said stud being tubular and having an
adjustable valve for said idle air passage threaded therein,
having at its top a tool engaging formation to be en
gaged by a tool inserted into the upper end of the tu
said valve having a formation at its upper end for en
bular upper portion, and friction means associated with
gagement with a valve adjusting tool inserted through the 20 said valve to prevent accidental displacement of said
opening in said carburetor assembly from the top there
valve, said friction means comprising an annular spring
seat in said stud and a coil compression spring extend
ing between said seat and said valve.
10. A carburetor assembly comprising a body having
of and through the tubular stud, and friction means as—
sociated with said valve effective to frictionally lock said
valve against accidental displacement.
4. An assembly as de?ned in claim 3 in which said fric
tion means comprises an annular spring seat in said stud
air and fuel mixture passages therethrough and a central
cavity in communication with atmosphere, and having
aligned openings above and below said cavity, an attach
ment stud having a locating ?ange in said cavity engage
able Wih the portion of the body surrounding the lower
and a coil compression spring extending between said
seat and said valve.
5. An assembly as de?ned in claim 3 in which said
friction means comprises a plastic friction plug in the 30 opening, the lower opening being enlarged at its lower
threaded portion of said valve for frictional engagement
end to form a chamber in communication with said air
with mating threads at the interior of said stud.
and fuel mixture passages, said stud having an idle air
6. A carburetor assembly comprising a body having
passage extending from said cavity to said chamber, said
air and fuel mixture passages therethrough and a central
stud extending into the opening above said cavity and
cavity in communication with atmosphere, and having 35 having a tubular internally threaded upper portion, a
aligned openings above and below said cavity, an attach
threaded adjustable valve in said portion controlling idle
ment stud having a locating ?ange in said cavity engage~
‘air ?ow between said cavity and chamber, said valve
able with the portion of the body surrounding the [lower
having at its top a tool engaging formation to be en
opening, the lower opening being enlarged at its lower end
gaged by a tool inserted into the upper end of the tubular
to form a chamber in communication with said air and 40 upper portion, and friction means associated with said
fuel mixture passages, said stud having an idle air passage
valve to prevent accidental displacement of said valve,
extending from said cavity to said chamber.
'
said friction means comprising a plastic friction plug in
the threaded portion of said valve for frictional engage
7. A carburetor assembly comprising a body having air
ment with mating threads at the interior of said stud.
and fuel mixture passages therethrough and a central
cavity in communication with atmosphere, and having 45
11. A carburetor assembly for attachment to an engine
aligned openings above and below said cavity, an attach
manifold having a tapped recess, said assembly compris
ing a throttle body having a vertical opening therethrough
ment stud having a locating ?ange in said cavity engage
adapted to be supported on said manifold with the ver
able with the portion of the body surrounding the lower
tical opening in alignment with the tapped recess, the top
opening, the lower opening being enlarged at its ‘lower end
to form a chamber in communication with said air and 50 surface of said throttle body providing a circumferential
shoulder which is concentric with said vertical opening,
fuel mixture passages, said stud having an idle air pas~
a main body attached to said throttle body having air
sage extending from said cavity to said chamber, said
and fuel mixture passages extending therethrough, said
stud extending into the opening above said cavity and
main body having a cavity at its underside in alignment
having a tubular internally threaded upper portion, a
threaded adjustable valve in said portion controlling idle 55 with the opening through said throttle body and an up
ward tubular extension also in alignment with the open
air ?ow between said cavity and chamber, said valve
ing in said throttle body, a passage connecting said cavity
having at its top a tool engaging formation to be engaged
to atmosphere, a stud having a locating ?ange in said
by a tool inserted into the upper end of the tubular
upper portion.
cavity engaging the circumferential shoulder of said
throttle body for determining the position of said stud
8. A carburetor assembly comprising a body having
air and fuel mixture passages therethrough ‘and a cen
60 Within said opening, and a threaded lower end on said
tral cavity in communication with atmosphere, and hav
ing aligned openings above and below said cavity, an at
tachment stud having a locating ?ange in said cavity en
gageable with the portion of the body surrounding the
lower opening, the lower opening being enlarged at its 65
lower end to form a chamber in communication with
said air and fuel mixture passages, said stud having an
stud adapted to be threadedly received in the tapped
recess in said manifold, the upper end of said stud being
shaped for engagement by a tool inserted through said
tubular extension, said stud having an idle air passage
extending from an intermediate portion in said cavity
to the vertical opening in said throttle body.
12. A carburetor assembly for attachment to an engine
manifold having a tapped recess and locating pins spaced
from said recess, said assembly comprising a throttle body
ber, said stud extending into the opening above said
cavity and having a tubular internally threaded upper 70 having a vertical opening therethrough adapted to be
idle air passage extending from said cavity to said cham
portion, a threaded adjustable valve in said portion con
supported on said manifold with the vertical opening in
alignment with the tapped recess, the top surface of said
throttle body providing a circumferential shoulder which
said valve having at its top a tool engaging formation
to be engaged by a tool inserted into the upper end of the 75 is concentric with said vertical opening, a main body
attached to said throttle body having air and fuelmix
trolling idle air flow between said cavity and chamber,
7
ture passages extending therethrough, said main body
having a cavity at its underside in alignment with the
opening through said throttle body and an upward tu
bular extension also in alignment with the opening in
said throttle body, a passage connecting said cavity to
atmosphere, a stud having a locating ?ange in said
cavity engaging the circumferential shoulder of said
throttle body for determining the position of said stud
8
phere and vertically aligned openings above and below
said cavity, a circumferential shoulder in said body at
the bottom of said cavity, a vertical mounting stud re
ceived in said openings and having a threaded lower end
extending below said assembly for fastening engagement
with the threaded recess in the manifold, ?ange means on
said stud engaging said shoulder to clamp said assem
bly to the manifold, the upper end of said stud being
shaped for engagement with a tool inserted into the top
within said opening, and a threaded lower end on said
stud adapted to be threadedly received in the tapped 10 of the opening above said cavity, an air cleaner on said
body, a tubular element having its lower end threaded to
recess in said manifold, the upper end of said stud being
shaped for engagement by a tool inserted through said
tubular extension, said throttle body having recesses for
receiving said pins to locate said throttle body on the
15
manifold.
13. A carburetor assembly for attachment to an engine
manifold having a tapped recess, said assembly compris
ing a throttle body having a vertical opening therethrough
adapted to be supported on said manifold with the ver
said body in alignment with the opening therein above
said cavity, said element extending through said air
cleaner, and fastening means on said element engaging
said air cleaner to clamp it against said carburetor body,
said stud having a passage therethrough extending from
said cavity to the under side of said body to provide a
?ow of idle air to the manifold.
17. A carburetor assembly for mounting on a manifold
having a threaded recess therein, comprising a body hav
ing a central cavity in communication with atmosphere
tical opening in alignment with the tapped recess, the top
surface of said throttle body providing a circumferential
and vertically aligned openings above and below said
shoulder which is concentric with said vertical opening,
cavity, a circumferential shoulder in said body at the
a main body attached to said throttle body having air
bottom of said cavity, a vertical mounting stud received
and ‘fuel mixture passages extending therethrough, said
main body having a cavity at its underside in alignment 25 in said openings and having a threaded lower end extend
ing below said assembly for fastening engagement with
with the opening through said throttle body and an up
the threaded recess in the manifold, ?ange means on said
ward tubular extension also in alignment with the open
stud engaging said shoulder to clamp said assembly to the
ing in said throttle body, a passage connecting said cavity
to atmosphere, a stud having a locating ?ange in said
manifold, the upper end of said stud being shaped for
cavity engaging the circumferential shoulder of said 30 engagement with a tool inserted into the top of the open
throttle body for determining the position of said stud
ing above said cavity, an air cleaner on said body, a
tubular element having its lower end threaded to said
stud adapted to be threadedly received in the tapped recess
body in alignment with the opening therein above said
cavity, said element extending through said air cleaner,
in said manifold, the upper end of said stud being shaped
for engagement by a tool inserted through said tubular 35 and fastening means on said element engaging said air
extension, an air cleaner on said main body, a tubular ele
cleaner to clamp it against said carburetor body, said
ment threaded to said tubular extension and extending
stud having a passage therethrough extending from said
through a central opening in said air cleaner, and means
cavity to the underside of said body to provide a ?ow
on said tubular element to clamp said air cleaner to said
of idle air to the manifold, the upper portion of said
main body, the opening through said tubular element
stud being tubular and internally threaded, a threaded
being aligned with the threaded opening in said tubular
valve in said stud adjustable to control idle air ?ow, said
extension to afford access therethrough to said stud.
valve being accessible for adjustment by a tool inserted
14. A carburetor assembly for mounting on a manifold
through said tubular element and the tubular portion of
having a threaded recess therein, comprising a body
said stud without removal of said air cleaner from said
having a central cavity in communication with atmos
carburetor assembly.
within said opening, and a threaded lower end on said
phere and vertically aligned openings above and below
v18. A carburetor assembly for attachment to an en
said cavity, a circumferential shoulder in said body at
the bottom of said cavity, a vertical mounting stud re
ceived in said openings and having a threaded lower
gine manifold body having a tapped recess comprising
a throttle body having a vertical opening therethrough
adapted to be supported on said manifold body with the
vertical opening in alignment with the tapped recess, the
top surface of said throttle body providing a circumfer
ential shoulder which is concentric with said vertical
opening, a main body attached to said throttle body hav
ing air and fuel mixture passages extending therethrough,
said main body having a cavity at its underside in align
ment with the opening through said throttle body and an
upward tubular extension also in alignment with the open
ing in said throttle body, a passage connecting said cavity
end extending below said assembly for fastening engage
ment with the threaded recess in the manifold, and ?ange
means on said stud engaging said shoulder to clamp said
assembly to the manifold, the upper end of said stud being
shaped for engagement with a tool inserted into the top
of the opening above said cavity.
15. A carburetor assembly for mounting on a mani
fold having a threaded recess therein, comprising a body
having a central cavity in communication with atmos
phere and vertically ‘aligned openings above and below
to atmosphere, a stud having a locating ?ange in said
said cavity, a circumferential shoulder in said body at 60 cavity engaging the circumferential shoulder of said
the bottom of said cavity, a vertical mounting stud re
throttle body for determining the position of said stud
ceived in said openings and having a threaded lower end
within said opening, a threaded lower end on said stud
extending below said assembly for fastening engagement
adapted to be threadedly received in the tapped recess in
with the threaded recess in the manifold, ?ange means on
said manifold body, the upper end of said stud being
said stud engaging said shoulder to clamp said assembly
shaped for engagement by a tool inserted through said
to the manifold, the upper end of said stud being shaped
tubular extension, and a plurality of pins provided on one
for engagement with a tool inserted into the top of the
of said throttle body or said manifold body with the
opening above said cavity, an air cleaner on said body,
remaining body having recesses for receiving said pins
a tubular element having its lower end coupled to said
to locate said throttle body on the manifold body.
body in alignment with the opening therein above said
19. A carburetor assembly for attachment to an en—
cavity, said element extending through said air cleaner, 70 gine
manifold having a tapped recess, said assembly com
and fastening means on said element engaging said air
prising
a throttle body having a vertical opening there
cleaner to clamp it against said carburetor body.
through adapted to be supported on said manifold with
16. A carburetor assembly for mounting on a mani
the vertical opening in alignment with the tapped recess,
fold having a threaded recess therein, comprising a body
a main body attached to said throttle body having air
75
having a central cavity in communication with atmos
it)
and fuel mixture passages extending therethrough, said
body having a cavity at its underside in alignment with
the opening through said throttle body and an upward
tubular extension also in alignment with the opening
with a threaded recess on an engine manifold, said stud
in said throttle body, a passage connecting said cavity to
able valve for said idle air passage threaded therein.
having an idle air passage extending from an interme
diate portion thereof to the underside of said carburetor
assembly, said stud being tubular and having an adjust
atmosphere, a stud having a locating flange in said cavity
engaging the upper surface of said throttle body for deter
mining the position of said stud within said opening, an
22. A carburetor assembly having a vertical opening
extending completely therethrough, the opening having a
circumferential shoulder therein, an elongated tubular
‘mounting stud open at one end and closed at the other
said stud adapted to be threadedly received in the tapped 10 end, a locating ?ange on said stud near the closed end
recess in said manifold, a tubular internally threaded
thereof and engageable with said shoulder for determin
upper portion on said stud, a threaded adjustable valve
ing the position of said stud within said opening, said
in said portion for controlling idle air ?ow through said
closed end being threaded and extending below said as
idle air passage, the upper ends of each of said stud and
sembly for fastening engagement with a threaded recess
valve ‘being shaped for engagement by a tool inserted 15 on a support, and radially extending upper and lower
through said tubular extension, an air cleaner on said
ports in the wall of said stud on opposite sides of said
main body, a tubular element threaded to said tubular
locating ?ange which communicate with the interior of
extension and extending through a central opening in said
said stud to form an idle air passage.
air cleaner, and means on said tubular element to clamp
23. A carburetor assembly having a vertical opening
idle air passage in said stud, a threaded lower end on
said air cleaner to said main body, the opening through
said tubular element being aligned with the threaded open
ing in said tubular extension to afford access therethrough
extending completely therethrough, the opening having a
circumferential shoulder therein, an elongated tubular
mounting stud open at one end and closed at the other
end, a locating ?ange on said stud near the closed end
to said stud and valve.
20. A carburetor assembly having a vertical opening
extending completely therethrough, the opening having a
25 ing the position of said stud within said opening, said
circumferential shoulder therein, a mounting’stud having
a locating ?ange engageable with said shoulder for deter
closed end being threaded and extending below said assem
bly for fastening engagement with a threaded recess on a
mining the position of said stud within said opening, and
support, and radially extending upper and lower ports in
the wall of said stud on opposite sides of said locating
?ange which communicate with the interior of said stud
thereof and engageable with said shoulder for determin
a threaded lower end portion on said stud extending be
low said assembly for fastening engagement with a
threaded recess on an engine manifold, said stud having an
to form an idle air passage, said stud having an adjust
able valve therein threaded to a portion of the stud im
mediately above the aforesaid upper port.
idle air passage extending from an intermediate portion
thereof to the underside of said carburetor assembly.
21. A carburetor assembly having a vertical opening
extending completely therethrough, the opening having
35
a circumferential shoulder therein, a mounting stud hav
UNITED STATES PATENTS
ing a locating ?ange engageable with said shoulder for
determining the position of said stud within said open
ing, and a threaded lower end portion on said stud ex
tending below said assembly for fastening engagement
References Cited in the file of this patent
40
2,060,747
2,296,697
2,618,474
Ray?eld _____________ __ Nov. 10, 1936
Ball ________________ __ Sept. 22, 1942
Agar _______________ __ Nov. 18, 1952
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