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Патент USA US2121392

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June 21, 1933.
Filed Jan. 5, 1958
_Patented 'June 21, 1938
cnoKE VALVE coN'rnoL
nemici Ashworth, _Manci-nc, N. Y.
Application January 5, 193s, serial Nc. _183,557
a- claims. (ci. 12a-11s)
This invention relates to choke valve controls.
AAmong the advancements in the art ñowing
It is Well recognized that internal combustion from my simplified construction are the features
engines have diiiîculty in starting, and this is par- that enable the consolidation of the solenoid and
ticularly true in cold weather. To overcome the dashpot structure >in the same cylinder without
diñiculty; a charge abnormally rich in fuel is ln- modifying the cylinder walls to afford a by-pass 5
troduced into the cylinders during the initial for the. fluid around the Adashpot piston. An
revolutions of the engine. This is accomplished other advantage of my simplified structure Aallows
by closing the valve, known as the choke valve, ' the elimination of springs in the working parts
which controls the supply of air, and4 drawing in because the present invention operates substan
1o substantially pure fuel when the engine’is turned
tially by gravity. A further advantage in the 10-
by the starting motor. It has been found that
after the ñrst few revolutions, and after the
engine starts,- `that a continuation of the choke
valve in the closed position floods the cylinder
l5 With fllely and, Het Only StODS it, but the ÍlOOdîIlB’ '
causes dilution of the ‘lubrication in the crank
case. If the choke valve is ‘returned immediately
TQ its full Open DOSitiOn When the engine Starts,
.the Composition of the charge is S0 lean in fuel
2O ‘that the engine often stalls when it is placed
under its normal load. Automotive engineers
`have long .been seeking the ideal construction
which automatically closes the choke valve until
the engine starts and thereafter permits the
25 choke valve to open progressively in accordance
present invention involves the use of an electro
magnetic operating mechanism which obviates
the use of catenulated'rods and linkage of otherv
known devices; and permits my invention t0 be
used under conditions which require remote con- 15
tro] of a, positive nature where such rods and
linkage would be cumbersome. For example, in
automobile busses and trucks, or on motor boats,
where the'engine is situated at a great distance
and ina tortuous direction from the customary 20
position of the operator.
i -'
A s15111- furl-,hor advantage of my invention is
that it promotes a quick cracking. of the choke
valve to the partly open position, and a slow uni
form progress of the valve from the partly open 25
W1th_ the accepted ïfequìrements 0f emeient Op'
position throughout the remainder of its return
eratlon. Such requ1rements involve a quick return or cracking of the choke valve to the partly
to the fun open position, A further advantage
of my invention resides in utilizing a. metal 0f high
9pm positíorf’ Where an' may be instantaneously
so introduced into the substantially pure fuel
charge; and from this partly @en position' the
choke valve should progress uniformly throughout the remainder of its path to the fun -open or
I am aware
the fact that prior
to my inven,
devices for contion Gther
thermal expansion properties, such as aluminum,
or die casting metal' mmaking the housing cyl.. 30
inder so that the movements of the choke valve
Wm be Ínñuenced by the heat of the cooling Sys
tem of the engine. Were my device in direct con
tact with the heat
of the'engine ' as by> contact
with the exhaust manifold, or
the exhaust pipe,
trolling the same movements of the choke valve
au the known liquids Servlceable in da'shpots
but my invention
` is believed to embody several’
would either. evaporate
or increase in . viscosity
features which are a considerable improvement
over these known devices. One advanta e of m
through evapotatlon to an extent Where a' harm
ful eñect in the operation would be predueed- I
invention resides in a construction Whicïi makexsr -Plame my housing cylinder for' the deshpot m the
it' adaptable t‘o customary internal combustion
engines on the market, and particularly those
engines used in standard automobiles, so that the
Isaid control may be incorporated when the auto--
area of the cooling system so that the heat ei:
Change Will be milder than the heat exchange 111
the area 0f theexhaust manifold and the exhaust
Pipe- I
mobile is built, or it may be sold as an accessory
With the foregoing and other ObJectS
,_ 0f the m'
and installed with the4 minimum of expense in the
VentiOn in View, my invention CODSÍSÉS 0f a UDVel
- limited space provided.
My choke valve control
iseasily substituted as an accessory, although not
l; limited to-this use, for the customary manually
operated rod control vwithout expensive altera-V
tion; has fewer operating parts than other known
Combination, arrangement and COIlStl‘l-letiOn 0f
parts as Will be more Particularly described and
illustrated in the eCCOmDaIlying Specification and 5o
drawing, but it will be understood that changes,
variations, and modifications may be resorted to v.'
choke controls performing the same operations;
without departing from the spirit of the invention'
and promotes economy of manufacture owingto
in the subjoined claims.
i the simplifled design and construction.
Referring to the drawing in detail wherein is 55
disclosed the preferred embodiment of my inven
Figure 1 is a side elevation of a portion of an
internal combustion engine, as mounted in an
automobil , and showing an adaptation there
with of a choke valve control of the present in
shaft when the link is moved. The hollow dash
pot cylinder C also forms a‘ combination housing
or casing for the cylindrical solenoid and other
operating parts of the device. 'I'he cylinder is
made of metal of a high coefficient of' expansion
to heat'. I prefer to make the cylinder in -two
parts, the numeral 20 indicating the upright cup
shaped bottom part and 2l designating the Vin
Pigure 2is an enlarged detailed vertical sec
verted cup-shaped top part. The open confront
ing ends of the top and bottom parts telescope
tion through the housing or cylinder with other
parts of the engine in side elevation and partly
broken away, and also showing the valved piston
>of the dash pot when the choke valve is open. '
Figure 3 is a fragmentary sectional view
through the cylinder of the choke control device
showing the parts of the valved piston when the
into each other and are secured together by the
threaded joint 22.
conventional solenoid 22. Adjacent the solenoid
in the lower end >of the cylinder is arranged the
dashpot member and in the top of the cylinder is
choke valve is being closed by the energized sole
a compartment 24 which accommodates the
movement of the piston rod and actuating arm as
4 is a transverse section through the
will presently appear. A magnetically responsive
cylinder of the choke control showing the piston
in plan.
piston rod made in two parts 25, 2l extends
through the bore 23a of solenoid 23 and has parts
Figure 5 is a sectional plan view taken on a
thereof projecting from each end of the solenoid.- -
plane directly. above the cylinder of the choke
'I‘he upper part 25 oi!v the piston rod is made of
control and looking downwardly.
metal inactive ¿to magnetism and the lower part>
Figure 6 is a wiring .diagram of the electric
26 is metal responsive to magnetism such as iron
or steel. Part ìl‘is anchored fast in a socket in
circuit of the choke- valve control of the present
part 2l and the latter, in the ,lowermost position
of the stroke of the piston rod 'shown in Figure 2,
Referring to the drawing in detail, A indicates a
remote control panel, such as an instrument board
of an automobile, a control board of a motor boat,
or any other remote position where a human op
erator may be located who wishes to control the
extendsinto the bore 22a a suilicient distance to
lie in the field of magnetic force.
explain anI application of the present invention.
The internal combustion engine B has the .cus
tomary circulating water cooling system and is
equipped with a >water cooled cylinder block 1,
and bolted to the block is a water cooled cylinder
head l provided with the cus
ary channels 9
through which the cooling water circulates. .A
conventional down draft carburetor is indicated
at Il, where the fuel is admitted for carbureting
the air passing through the down draft pipe il
from the- air filter _|2. The admission of the fuel
mixture is controlled by the customary accelera
tor rod Il. The charge of air and fuel is delivered
to the customary intake manifold Il from where
it is distributed to the cylinders and exploded,
the resulting products of combustion passing out
of the cylindersto the exhaust manifold il in the
Above thecarburetor Il, in the down draft pipe
i I there is rotatably mounted a choke valve shaft
It to which is fixed in any- suitable manner a
round fiat__ disk‘which
forms the choke valve I1
of the butterfly type. This choke valve I1 is'
different and distinct from the throttle or accel-y
erat'or valve which controls the admission of fuel.v
The chokewalve I1 in the customary construc
tion, and immy constructio , is normally in the
‘open position indicated in full lines in Figure 2
y the drawinß; and remains in that position as ,
‘long as the control of the present invention is
inoperative. In my construction, the choke valve
level indicated at 28. On the side of the bottom
part 2l is an outset filling neck 29 to replenish
the liquid and the passage of the neck is closed
by a screw plug 30. The lower part 26 of the pis
combustion engine are shown. as is necessary to
The dashpot member consists of the dashpot
chamber 21 filled with liquid such 8.5 Oil t0 the
conventional internal combustion engine i3.l
Only those parts of the conventional internal
customary manner'.
In an intermediate part of the _
cylinder properly insulated from the walls is a
ton rod extends into the oil in chamber 2l and
has a reduced lower end 3i on the terminal of
which> is threaded a nut or collar 22. Fixed
against the shoulder formed at the point where
the reduced part 3i joins with the part 28 of the
piston rod is a round valve disk 33 and this valve
has a peripheral depending lip I4. ,Thedashpot
piston 35 slides very freely on reduced part 2| of
the piston'rod within the limits of the valve 3l 45
and the collar 32. The piston l5 has a normal
clearance 60 between its periphery and the wall of
the cylinder at room temperatures sufficient to
permit the liquid to pass between during the re
ciprocation of the piston rod. However, the clear 50
ance increases when the walls of the cylinder ex
pand under the >temperature induced by locating
the-cylinder in the areaI of the cooling system. It
will thus be seen that the entire range of move
ment of the piston isdnfluenced by the thermal
expansion of the wall of the cylinder, which latter
is in heat exchange relation with the cooling sys
tem of the engine, as will hereafter appear.
The upper face of the piston 3l is flat, and in 60
an intermediate part of the piston. are by-pass
openings li preferably four in number. -The
in diameter than the piston
to permit free passage of the liquid through the
- valve diskl „is less
piston and around the valve on -the up stroke of 05
the piston rod when the solenoid is energized.
When the piston abut! th'e valve, the by-pass
. swings to open position by the weight o! the actu
openings are closed by the valve and the liquid
ating arm and connecting rod as will presently can- only pass between the periphery o'f'the pis
In the closed
ton and the wall of the cylinder.
dotted linea il, in Figure 2, the choke valve sub- .
I prefer to mount the cylinder C on the head 2
stantially closes the passage in the down draft of the cylinder block as .close as possible to the
,pipe Il and substantially no air is admitted to channels I _of the water circulating system that
the carburetor in which case a charge almost pure cools the-engine. _To mount the cylinder, there is
in fuel is drawn into the cylinders. 'I‘he shaft Il a threaded socket 21 in the bottom wall 22 of the
extends to the outside and beyond the pipe i i and bottom part 2i. The customary stud bolt 32 b'y
has'a‘link Il connected to it which turns the
which the head .of the engine is bolted to the
cylinder block is made a little longer -than usual,
and the free upper end seats in the socket 31 as
e 2.
primed with a charge rich in fuel, the switch 55
is opened whereupon the solenoid is deenergized,
>The weight of the piston rod, which obviously
By this manner of mount
ing the axis of the cylinder extends perpendicular ' forms the core of the solenoid coil, permits it to >
to the engine cylinder head, and the cylinder C is sink in the liquid of the dashpot chamber 21
in heat exchange relation with the water cooling until the piston valve 33 encounters the mate
system-and remotely situated with respect to the rially'slower sinking piston 35, from which point
of encounter the piston rod is retarded by the
exhaust manifold I5 and the exhaust pipe.
One projecting end, the
upper end of the pis-` y
ton rod which projects free of the end of sole
noid coilV 23, bearsagainst an intermediate part
`of an actuating arm 40. Arm 4l) extends into a
dashpot action throughout the remaining dis
tance of its stroke, because the sole path for dis 10
placing the liquid is the clearance _space 6B be
tween the periphery of the piston and the wall
slot 4I in the side of top part 20 of cylinder C, of the cylinder.
15 and
The distance the piston rod freely drops when
has the inner end pivoted at 42 to the cyl
inder C. The intermediate portion of arm 40 the solenoid 23 is deenergized, permits the weight 15
extends diametrically across the cylinder and of the connecting rod 4_4 and the actuating arm
swings in the upper chamber 24. 'I'he slot 4I - 40 to partially open or crack the choke valve I1
the swinging movement of arm 40, the to the dotted line position `58`shown in Figure 2.
20 limits
dotted line position in Figure 2 indicating its The quick cracking or partial- Äopening of the
uppermost position when the choke valve I1 is choke valve I1 simultaneously admits sufficient
closed and the full line position shown in Figure air to thin the 4rich fuel and allowsathe engine
2 showing the normal position when the choke to be accelerated when placed línderwits load.
valve I1 is in full open position and the sole ‘ As the piston and weight of the piston rod now
noid 23 deenergized. A portion of actuating arm bearing on the piston slowly sinks in the liquid
under dashpotf action, ¿the choke valvev I1 uni 25
40 protrudes outside the cylinder C and this por
tion is provided with a longitudinal slot 43 which formly and progressively‘opens to the full line
co-operates to furnish adjustment of the choke position shown in Figure 2, >allowing a greater
valve I1.
A connecting rod 44 is provided near the low
er end with a ball and socket joint 45 to accom
amount of air to enter‘the carburetor as the
valve opens.
modate swinging movement of the rod. 'I'he
lower terminal of the connecting rod' 44 has an
oiïset threadedV stem 46 which extends throughv
If the engine is warm when it is4 started, and 80
it is necessary to choke the engine by closing
the choke valve I1, the cylinder C having a high
coeñ‘icient of thermal expansion, will have ex
panded by the heat radiated fromthe cooling
nut 41 which secures the connecting rod and arm'
together. The upper end of connecting .rod 44 is
system of the engine on which the cylinder is
mounted. In this case, there will be greater 35
35 the slot 43 in Varm 40 and this stem receives the
connected to the outer end of link I9 which
turns the choke valve shaft I 6. This connection
is shown atv 48 and consists of forming anout
set teat on the end of the connecting rod which
passes through an opening in the end of link
I9 and the inner end of the teat is prevented from
detachment by the cotter pin extending through
an opening in the teat all of which is shown in
Figure 1. Since fthe nut 41 makes a fixed con
clearance between the wall of the cylinder C and
the periphery- of the piston 35 thereby allowing
quicker movement of the choke valve because the
liquid of the dashpot will be displaced in ac
cordance with the proportional increase in the 40
clearance'space, and this quickened movement
prevails throughout the entire range of move-
ment of the pistonv rod. Since there is a normal
clearance 60 between the peripheral edge of the
nection between the connecting rod 44 and the . piston and the wall of cylinder C. the oil or
arm 40, the ball and socket joint 45 permits the other liquid in the clearance space will act as
connecting rod> to have a swivel joint in its an insulator and prevent a substantiahamount
length which is necessary in translating move
ment from., the actuating arm to the1link`I9.
To permit circulation of air in the cylinder C,
I make openings 49 in the sides of the upper
part 20. I also prevent liquid in the dashpot
55 chamber 21 from getting into- the solenoid coil
23, bysecuring a rubber or fiber washer 5I in
the lower end of the upper part 2li of cylinder C.
Electricity to operate the solenoid 23 is sup
plied from a battery 52, which is grounded at> 53,
by an electrical conductor wire 54 which con
ductor wire connects with the switch 55 on the
panel A. Leading from the switch and connect
ed to the solenoid coil 23 is an electrical conduc
tor wire 56. 'I'he solenoid is grounded at 51.
The parts of` my choke valve control arevsub
stantially in the position shown in Figure 2,
when the engine B is at rest. In starting the
engine B, switch 55 is closed at the same time
the starting motor for the engine is brought into
operation. -By closing switch 55, solenoid 23 is
energized and piston rod moves upwardly with
the valved piston parts in the position shown -in
Figure 3, which action closes choke- valve I1 to
the dotted line position I8 shown in FigureY 2.
75 When the-cylinders of the 'engine have been
of heat from expanding the piston tò\ corre
spond with the expansion of the cylinder G.
appreciable quickening effect is noticeable from 50
the thermal expansion of the cylinder C on the
return stroke of the piston Vrod~when initially
starting a cold motor because some heat is ‘im
parted to the cooling water and transferred to
the cylinder C during the interval of time the 55
device is in operation.
In Figure 2 of the drawing I- have shown one
way of fastening the solenoid 23 in the upper
part 20 of cylinder C, although other ways of
fastening may be devised. In assembling the
solenoid 23 in the upper part 20, the said sole
noid is slid into the upper part of the cylinder
until the customaryv fiber or rubber v_washer 53
that is found -at the top of the conventional sole 65
noid abuts against .small outstanding teats 62»
near the top of'part` 2U. These teats may be‘-v
made by making indentations in the walls of the
upper part 2U of the cylinder as shown, or they
may be made in other ways. After the solenoid
is inserted _in the u er part 20, then the upper
part “is screwed into the lower part 2| until. the
free' edge of the lower part bears against the
shoulder 64 on the upper part 20. In the screw
Joint 22, a hole is then drilled and tapped with 75
the solenoid, said connecting means including an
-threads to. receive the screw Il. This screw O_I
actuating arm pivotally connected with tbe oll
is screwed into the hole until the inner end ex
tends into the cylinder under the über or rubber
washer il on the bottom ot the solenoid 23, and
the inner end of the screw prevents the solenoid
inder and engageable with the free end of the
piston, and a connecting rod adjustably con
nectedtotheactuatingarmand connectedwith 5,
the choke valve.l
. from becoming dislocated in the cylinder during
_the contraction and expansion of the cylinder
under the iniluence of the heat of the cooling
with a water cooling system, the combination
.with a normally open choke valve ofY the car
Having described my invention, what I claim
1. In anv internal combustion engine equipped
n with a cooling system, the combination with a
normally open retractile choke valve of the car
15 buretor thereof, oi' manually controlled electro
magnetic means for moving the choke valve in
one direction opposed to the direction' of the re
buretor thereof, of a cylinder formed of a metal 10
having a relatively high coemcient oi thermal
expansion, an electro-magnetic means mmmted
in a part 'of the cylinder for urging the choke
valve to closed position upon the energimtion
thereof, means for connecting the electro-mair 15
netic means with the choke valve. a. dasbpot
tractile force, and a dashpot provided with a
chamber containing liquid in another part of the
cylinder, a piston in the liquid in the dashpot
chamber and connected with the electro-mag
netic means to resist movement thereof, said cyl 20
variable rate o! ,movement _within the limits ot
its stroke to retard `the _retraction of the choke ' inder positioned in the area of the cooling sys
valve upon the release `o! the electro-magnetic tem of the engine in heat exchange' relation
means, and the entire range' of the movement of
the dashpot further controlled by the tempera
ture of the coolingsystem. -
2. In‘an internal combustion engine'thr, com
pension of the said cylinder as influenced by the 25.
temperature ofthe coolingsystemof the engine.
` bination with a normally open choke valve there
6. In an internal combustion engine, the com
oi', of av cylinder, a solenoid mounted in a-part _ bination with a normally open choke valve of the
a cylinder, a solenoid
of the cylinder, a dashpot
part of the cylinder, a magnetically responsive
mounted in ‘an intermediate portion thereof, a 30
30 piston rod extending through and-projectingl dashpot chamber containing liquid in another
from each end of the solenoid.' a portion of the portion thereof adjacent the solenoid, a magneti
piston rod_ extending into the dashpot chamber
'and another portion forming the core of the
solenoid, a valved piston on the portion of the
piston ‘rod in the dashpot chamber
counter movement of the piston» rod relative to:
the magnetic force, connecting means between
the free end of the piston rod and the choke
valve, and means for supplying electricity to
energize the solenoid.
cally responsive piston rod forming a core inthe
solenoid and'proiecting from each end thereof,
one. projecting end of the piston rod disposed in ti
the liquid o! the dashpot chamber, a valved pis
‘ 3. In an -internal.combustion engine, the oom
bination with a normally open choke valve there
of, of a cylinder, a solenoid mounted in a part
of the cylinder, a dashpot chamber in another
part oi-the cylinder, a magnetically responsive
piston rod extending through and projecting
fromeach end of the solenoid, a portion ot the
the tree end of the piston
for operating the choke valve in response to the
movement of the- piston rod, manually con
trolled means for supplying electricity to energize
the aolmold. said valved piston being movably
moimted on the piston rod for limited movement
into the dashpot chamber -
and another portion „forming the core of thel
solenoid, a piston-on the portion of the piston
rod in the dashpot chamber resistingeoimter
. movement of the piston relative to the magnetic
force, connecting means between the free end _
ot the piston rod and the choke valve. _means i’oi'l
supplying electricity to energile the solenoid. and
the cylinder` formed of metal of a high eoemcienti
. ofv thermal expansion so as to control the move-'
ment of the piston in accordance with tbe tem- "
`perature of the engine
4. In an internal combustion engine, the oom- v
bination with a normally open choke valve there
of, of a cylinder, a. solenoid mounted in a part
, of the cylinder. a magnetically responsive piston '
rod extending through and projecting from each
end oi the solenoid, a portion of the piston rod
extending intothe dashpot chamber and another .
portion raming the
the nolmoid, a
rod in the dashpot "
on the portionot the , ,
movement relative to" ‘
chamber resisting counter
7o -the magnetic force, connecting means between
_the free end ot the piston rod andthe choke'_.
valve, means for supplying electricity to
Patent No. 2,121,592°
June 2l, 1958.
of the above numbered patent requiring correction as follows: Page LL, second
column, line-6h, claim 8, for the word "well" read will; and that the said
Letters Patent should be read with this correction therein that the same
may conform >to the record of the case in the Patent Office.
Signed and> sealed this 5th day of July, A. D. 1958.
Henry Van Arsdale,
Acting Commissioner of' Patente.
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