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Патент USA US2137665

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Nov. 22, 1938.
1__ CROC‘KETTI
GARBURETOR
‘2,137,665
I
Filed May 21, 1937
Inventor
8-”
m
M gunma
Attorneys
Patented Nov. 22, 1938
2,137,665
UNITED STATES PATENT OFFICE
2,137,665
CARBURETOR
Lynn Crockett, Flint, Mich.
Application May 21, 1937, Serial No. 144,038
2 Claims.
This invention relates to carbureters, the gen
eral object of the invention being to provide
means for improving the operation of the car
bureter at idling and intermediate speeds.
5
This invention also consists in certain other
features of construction and in the combination
and arrangement of several parts, to be herein
after fully described, illustrated in the accom
panying drawing and speci?cally pointed out in
the appended claims.
In describing the invention in detail, reference
will be had to the accompanying drawing where
in like characters denote like or corresponding
parts throughout the several views, and in
15 which:Figure l is an elevation with parts broken away
showing a carbureter constructed in accordance
with this invention.
Figure 2 is a view of the inner end of the plug.
20
Figure 3 is a longitudinal sectional view through
the plug.
In this drawing the body of the carbureter is
shown A and the carbureter is provided with the
usual passage I which leads the mixture to the
25 cylinders of the motor, said passage being con
trolled by the throttle valve 2.
In carrying out my invention I provide means
for controlling the flow of fuel from the low speed
passage 3 into the passage I at the valve 2, such
means including a plug 4 threaded in an opening
at the discharge end of the passage 3 and having
a chamber 5 therein into which the passage 3
discharges. The inner end of the plug is formed
with a large port 6 and a smaller port 1, these
35 ports connecting the chamber 5 with the passage
1 and a groove 8 is formed in the inner end of
the plug and gradually tapers upwardly and down
wardly from the large port 6 as shown in Figures
2 and 3, that portion of the groove below the port
40 6 being longer than the portion above the port as
shown in Figure 2. A' needle valve 9 controls
the port 6 and a similar valve 1 I] controls the port
7, these valves being threaded in holes in the plug
45
and have coiled springs II on the outer portion
for ?rmly holding them in adjusted position.
The outer ends of the valves have kerfed heads
so that they can be adjusted by a screw driver
or the like.
As will be seen when the throttle valve 2 is
closed some of the fuel can pass from the cham
ber 5 through the port 1 into the passage l to
the engine 5 from the carbureter so that the en
gine can idle with the throttle valve closed.
55 When the valve is slightly opened more of the
fuel will pass through the port 6 and the groove
8‘to gradually increase the speed of the engine
and this arrangement will give e?icient perform
(Cl. 261-41)
ance of the engine at speeds between idling and
high speeds.
'
The groove 8 acts to prevent closure of the
port 6 by the throttle when the throttle is slightly
opened from a closed position.
It will, of course, be understood that the needle
valves permit regulation of the amount of fuel
passing through the ports 6 and 1.
It is thought from the foregoing description
that the advantages and novel features of the
invention will be readily apparent.
It is to be understood that changes may be
made in the construction and in the combination
and arrangement of the several parts, provided
that such changes fall within the scope of the 15
appended claims.
What is claimed is:
1. In combination with a carbureter having a
main passage, a low speed passage and a throttle
valve for controlling the main passage, a plug 20
threaded in a hole in the carbureter at the junc
tion of the two passages, said plug having a
chamber therein into which the low speed pas
sage discharges and said plug having a large
port and a small port therein communicating
the chamber with the main passage, needle valves 25
carried by the plug for controlling the ports, the
throttle valve when closed separating the ports
with the small port on the engine side of said
valve and the inner end of the plug having a
groove therein into which the large port leads, 30
said groove extending lengthwise of the passage
and acting to prevent the large port being en
tirely closed by the throttle when the throttle
moves slightly to open position from entirely
35
closed position.
2. In combination with a carbureter having a
main passage, a low speed passage and a throttle
valve for controlling the passage of fuel through
the main passage, a part having a large port and
a small port therein connecting the low speed
fuel passage with the main passage for permit
ting fuel to pass from the low speed fuel passage
into the main passage, the small port leading into
the main passage on the engine side of the throt
45
tle valve when the valve is closed and said valve
when closed separating the ports, a needle valve
for controlling the large port, a second needle
valve for controlling the small port and that
portion of the wall of the main passage to which 50
the large‘ port opens out having a groove therein
extending lengthwise of the main passage and in
communication with the outlet end of the, large
port for preventing said large port being entirely
closed by the throttle valve when said throttle 55
valve moves slightly to open position from a fully
closed position.
LYNN CROCKETT.
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