US2540607A - Engine starting device - Google Patents

Description

Feb. 6, 1951 BOYCE 2,540,607

ENGINE STARTING DEVICE Filed June 15, 1945 3 Sheets-Sheet 1 53 2 4 I? '/a 39 25 z? INVENTOR. LEONARD D. BOYCE Feb. 6, 1951 L. D. BOYCE ENGINE STARTING DEVICE 3 Sheets-Sheet 2 INVENTOR. LEONARD D. BOYCE Filed June 15, 1945 3 Sheets-Sheet 5 F l G. 6

L. D. BOYCE ENGINE STARTING DEVICE F I G. 7.

Feb. 6, 1951 Filed June 15, 1945 INVENTOR. LEONARD D. BOYCE gatented Feb. 6,. 1 951 1 UNITED STATES PATENT OFF-ICE ENGINE STARTING Leonard D. Boyce, Richmond Heights, Mo., as-

s'ignor to 'Carter Carburetor Corporation, St.

Louis,'Mo., a corporation of Delaware 7 Application June 15,1945, Serial No. 599,658

cilitate startingof the engine. In'most of these i the choke valve is urged towards closed position i when the temperature is low by a thermostat.

In. one example, a relatively strong thermostat 'is used and its force is counteracted by a suction responsive element, when'the engine starts to 12 Claims. (01. 261-49 devices for run under its own power, to admitproper air sup- 7 'ply.- Such ,a jdevice'is' illustrated in Coffey Patent No."2,085,351. In others, the choke is locked H a in fullclosed position before the engine starts to run and, afterwards, the lock is broken to re- 'lease.'the choke for control by the thermostat. In somecas'es', it is desirable that a thermostatic choke valve be locked in its assumed position ac- Fig. 5 is a section similar to'Flg. 4 but showing-- Fig. '1 is a detail section similar to Fig. '41b1 1t showing the structure of Fig. -*6 with the choke opened slightlyby engine suction. v Fig. 8 is aview similar to Fig. 7', but with the 1 partsin the funloading" position;

Fig; 9 is a similar view showing the choke locked in a partially open positionfor starting.

Fig. 1 shows an internaljcombustion engine 8 of the automotive type having an exhaust manifold 9 and an intake manifold In to which is attached a carburetor generally indicated at H. The carburetor throttle is operated in the usual manner by linkage l2 extending to throttle pedal cording to temperature durin cranking. However, it'ls alsov deslrable'that the valve be free to close at'all times .under the infiuenceofthe cool- 'ing'thermostat. 4 'Accordingly, it isans-object of. the present invention to provide a novel choke control device which can be locked insubstantiallyany position during ,crankingaccording to temperature, but whichflisfreeto respond to" the thermostat when theengine isnot r'uiming.

cefwhichis normally urged towards its locking .positiom but which is withdrawn therefrom when f mi-isp'also-withdrawn therefrom whenever the device adapted-"to 160mm choke in its assumed .positi'on"fo'r starting and also incorporating an funloader forlcausing partial-opening of the choke. when the throttle is fully opened.

. 'Another'object'istoprovide stake-camellia l3 located'conveniently for the driver." A starting motor M is located in position for cooperating "with the fly-wheel located in the housin IS in "starting the engine.

Fig. 2 shows a carburetor with a somewhat simstant level chamber I8-from which fuel is supp'liedto the barrelthrough main nozzle l9. Entry ,of air. into the upper part ofthe barrel is controlled by an unbalanced,-.butterfiy choke valve 20 one shaft lljournaled in the wall of the upper or 'airhorn portion 22 of the barrel. Choke valve 320 carriesa yieldingly mountedpoppet valve 23 which may be opened by} enginesuction, as de- 1 scribed hereafter. A coiled, 'bi-metal thermostat 24; has one end hooked around a fixed stop 250n-the alrhorn and the other end anchored in an extremity of choker shaft 2|. The thermostat ismounted so as to urge the choker valve 'close'dat low temperatures; A throttle 26 controls the discharg'e' -of mixture from the lower end of the barrel.

A quadrant 21, carried rigidly by the choker 1 "r rh se objects and other detailed objects here- 1 after appearing-are attained substantially by the. H

'in'which i l I "'Flg.;1- is-aview .of an internal combustion eng'ine and carburetor ,lthereto. I 1 e a I g Z 'i's' a somewhat'diagrammatic sectionaljyiewillustrating a' form of the invention. Fig; 3 :is a view similar toFig. 2 but showing '-a diflerent form of the invention."

device -'illustrated in the accompanying drawings ".Fig; .4is'a detail'fse'ction taken substantially on Q having the invention'applied shaft, has a series of pheripheral teeth 28.

Mounted on the air horn and. projecting laterally therefrom is a cylinder 29 in. which works a pistonv 30 constantly urged to'the right by a coiled spring 3'l; A locking finger 32' -projects rightwardlyfrom piston 30 and has'a point 33 for .co operating with the adjacent teeth 28 to lock .quadrant 26 andthe choke valve. A tube 34 connects the left hand end of cylinder 21 to a. port 35 opening into the mixture 'barrel posterior to throttle '26. Cylinder 28, thus, communicates with engine suction through port 35.

- A cam segment 36 is rigidly carriedby the throttle shaft and cooperates with a follower rod 31 slidable in guides 38 and 33. The upp r extremity of rod 31 extends within cylinder 28 so as to-iimit the rightward movement of piston 30. when throttle 26 is moved to its fully closed position, a high point 4| on cam 33 enga es rod 31 so as to push the rod upwardly and shift piston 30 and pointed pin or detent 33 tothe left or away from locking quadrant 21 so as to release the choke valve. Likewise, when the throttle is in substantially wide open position, another high point 42 on cam 36 insures retraction of detent 33. The cam has a low portion 43 between the extreme high points.

This device operates as follows:

Assuming the engine is to be started at a low temperature and that the throttle valve is in its normal, closed position, thermostat 24 will have urged choker valve 20 fully closed, as shown in Fig. 2; Throttle valve 26 is then slightly opened, as is desirable for starting, to bring intermediate low portion 43 of the cam in line with rod I '31, permitting this rod to drop. Thereupon,

locking pin 3! is urged rightwardly by spring.\30 into locking position with quadrant 26. The starter motor is then operated to crank the engine. The cranking suctions, however, do not effect either choker 20 or poppet 23. When the enginefires and starts to run under its own power, the sharply increased suction forces open poppet 23 to supply necessary additional air. Almost simultaneously, piston 30 is drawn to the left so as to unlock toothed quadrant 21. Thereafter, the choke valve is under the control of the thermostat and the direct action of suction thereon. After the engine has reached normal temperature, choke 20 will be fully open and will remain in that position irrespective of suction, until the engine again cools below its normal temperature.

When the engine is allowed to stand. idle after a run, the return of the throttle to its normal, close position will release the toothed quadrant so that the choke valve may freely close under the influence of the thermostat.

Figs. 3, 4, and shows a structurally different form of the invention in which the various choke control parts are mounted in a cylindrical housing 50 as in Fig. 1, adjacent the carburetor air horn 22a. Thermostat 24a is anchored at the .center to cover 5| of the casing and has a hook 52 at its outer extremity receiving an L-shaped arm 53 which is rigidly attached tochoker shaft 2la. Toothed quadrant 21a is also rigid with this shaft and positioned to be engaged by a pointed extension or detent 33a on suction piston 30a. Asshown, quadrant 21a forms an extension of L-shaped lever 53.

A sleeve 54 is loosely received on choke shaft 2ia,.between the air horn and casing 50 and carries a cam 36a within housing 50. Also rigid with the sleeve between the housing and the air horn is a lever 55 which is connected by a link 56 to an arm 51 rigid with the throttle shaft. Upon closing of the throttle, high point 41a of cam quadrant 38a engages the top of piston 30a to forcev it and locking point 33a downwardly and clear of toothed segment 21a. Point 33a is also released by suction, as in the previous form, when the engine starts to run under its own power. .When the choke valve is fully opened, as in Fig. 4, a second high point 42a on the cam engages the top of piston 30a and again releases locking segment 21a. In any intermediate positions of the throttle, segment 21a and the choke valve will be locked by pointed'element 33a whenever the engine is stopped. Thus, necessarib', the choke will beheld firmly during cranking, in whatever position it has assumed .under the influence of the thermostat provided the throttle is between fully open and fully closed position.

The formin Figs. 34. and 5 aiso shows a stove 60 mounted on exhaust manifold 9 and connected by a tube 3| to a boss 62 on housing T system, generally indicated at 64 'and a metering pin 65 connected to the throttle by lever 66 and link 61. v

The operation of the form in Figs. 3, 4, and 5 is-the same as that in Fig. 2, corresponding parts being given the same reference numerals with the letter 41" added.

The form i i-Figs. 7-9, inclusive, incorporates the features of the previous two forms, with the addition of "unloader mechanism. Suction piston 3% has pinned thereto, at one side of looking point 332;, an angular arm 10 having a curved slot 1|. Toothed segment 21b, rigid with choke shaft 2"), has a laterally projecting pin 12 received in slot 1|. As in the previous form, an' arm 55b, movable with cam 36b, is rotatable on the choke shaft and is connected by a link m 56b to throttle arm 51?).

This form operates the same as the previous form except for the unloader connection by means of which cam 36b is rotated to the position in Fig. 8, when the throttle valve issubstantially fully opened, to depress piston 30b.

At the same time, the upper edge of slot 1 engages pin 12 to move the toothed segment and the choke valve slightly. in the clockwise direc tion so as to openthe valve. In this position, continued cranking of the engine will draw air through the carburetor and manifold to sweep out excess fuel therein. The unloaden' elements do not affect the other operations of the mechanism, as previously described.

In all of the forms, means is provided to insure locking of the choke valve, in whatever position it has assumed in accordance with the temperature, as soon as the throttle is opened to the starting position to release detent carrying piston 30, 3041, or 30b. In case the choker valve is locked tightly closed in starting, the poppet valve therein will open as soon as the engine fires to supply necessary additional air. A fixed air hole may also be provided in the choke valve, as shown in the last two forms. This form of choke control has been found to start more satisfacte:lly with certain engines than other types at present known.

The invention may be modified as will occur to those skilled in the art and the exclusive use of all such modifications as come within the scope of the appended claims is contemplated.

I claim: v

1. A starting device for an internal combustion engine having a mixture conduit comprising a choke valve, a thermostat for moving said cho e valve towards closed position when the tem v ture is low, a member movable rigidly with i choke valve, an element for engaging said mem--- ber in substantially any position of said choke valve to lock the same, means constantly urging said element into locking relationship with said 2. ,A starting device for an internal combustion I engine having a fuel supply conduit and a throttle J therein comprising a valve in said conduit for enriching the'mixture, a thermostat for moving said valve toward mixture enriching position when the temperature is low, an element capable of-locksaid valve in substantially any position thereof. means normally urging said element into looking position with relation to. said valve, and suction responsive means for withdrawing said element from said locking position.

3.A starting device for an internal combustion engine having a supply conduit for fuel and air. mixture and a throttle therein comprisin a choke valve in said conduit for enriching the mixture, 'a thermostat for moving said valve toward mixture enriching position whenthe temperature is low, cooperating elements for locking said valve one of which is movable rigidly with said choke valve, means normally urging said other locking element into locking relationship with said first element, and means responsive to engine suction produced when the engine starts to run under its own power for withdrawing said other-element from said lockin relationship.

4. A starting device for an internal combustion engine having a supply conduit for fuel and air mixture and a throttle therein comprising a choke valve in said conduit for enriching the mixture, a thermostat for moving said valve toward mixture enriching position when" the temperature is low, cooperating elements, including a first element rigidly movable with said choke valve capable of locking said valve in substantially any position thereof, means normally urging the other of said elements into locking relationship with said first element, and means responsive to engine suction for withdrawing said other element from said locking relationship, said valve being constructed and arranged to move to and remain in its lean position during normal temperature operation.

5. A starting device for an internal combustion engine having a supply conduit for fuel and air mixture and a throttle therein comprising a choke valve in said conduit for enriching the mixture, a thermostat for moving said valve toward mixture enriching position when the temperature is low,

cooperating elements. including a first element rigidly movable with said choke valve for locking said valve, means normally urging the other of said elements into locking relationship with said first element, suction responsive means for withdrawing said other element from said locking position, and means associated with said throttle for withdrawing said other element from said locking relationship when the throttle is closed.

6. A starting device for an internal combustion engine having a supply conduit for fuel and air mixture and a throttle therein comprising a valve in said conduit for enriching the mixture, a thermostat for moving said valve toward mixture enriching position when the temperature is low, cooperating elements capable of locking said valve in anyintermediately open position thereof ineluding a first element movable with said valve, means normally urging the second of said 'elements into locking relationship with said first element. suction responsive means for withdrawing said second element from said locking position. and means associated with said throttle for withdrawing one of said elements from said locking 6 relationship when the throttle is substantially opened.

7. A starting device for arr-internal combustion engine having a supply conduit for fuel and air mixture and a throttle therein comprising an unbalanced choke valve in the air inlet of said conduit. a thermostat for moving said valve toward mixture enriching position when the temperature is low, cooperating elements for locking said valve in substantially any assumed position when the engine is not in operation including a first element rigidly movable with said valve, means normally urging a second of said elements into look-- ing relationship with said first element, a poppet valve yieldingiy carried by said choke valve and openable by engine suction when said choke valve is locked closed, suction responsive means for withdrawing said second lockin element from said locking relationship, and throttlev actuated means for withdrawing said second element from said locking relationship when said throttle is closed, said choke valve being constructed and arranged to move to and remain in fully open position when the engine is at normal operating temperature. v p 8. A starting device foran internal combustion engine having a mixture conduit with choke and throttle valves therein comprising a thermostat for moving said choke'valve toward mixture enriching position when the temperature is low, a member movable with said choke valve, an element for engaging said member in substantially any assumed position of said choke valve when the engine is not in operation to lock said choke valve, a spring normally urging said element into locking relationship with said member, a device movable responsive to'engine suction when the engine starts to operate under its own power for withdrawing said element from looking relationship with said member, and a mechanical connection between said element and said throttle 9. A starting device for an internal combustion engine having aninduction conduit with choke and throttle valves therein, a thermostat for moving said choke valve toward closed position when the temperature is low, cooperating elements capable of locking said choke valve in any intermediately open position thereof, and including a first element movable with said choke valve, means normally urging a second of said elements into locking relationship with said first element. and means for withdrawing said second element from said locking relationship responsive to movement of said throttle valve-to its fully opened position. a

10. A starting device for an internal combustion engine having an induction conduit with choke and throttle valves therein, a thermostat for moving said choke valve toward closed.p0sition when the temperature is low, cooperating elements capable of locking said valve in any intermediately open position thereof and including a first element.movable withsaid choke valve. means normally urging a second of said elements into locking relationship with said first element, means responsive to suction when the engine starts to operate under its own power for withdrawingsaid second element from said locking relationship, and additional means for withdrawing said element from said locking position when said throttle valve is in substantially fully open or fully closed position.

11. A starting device for an internal combustlon engine having an induction conduit with choke and throttle valves therein, a thermostat for moving said choke valve toward closed position when the temperature is low, cooperating elements capable of locking said valve in any intermediately open position thereof and including a first element movable with said choke valve, means normally urging a second of said elements into locking relationship with said first element, means responsive to suction when the engine starts to operate under its own power for withdrawing said second element from said locking relationship, and means for forcing said choke open upon substantially full opening of said throttle valve.

12. A starting device for an internal combustion engine having an induction conduit with choke and throttle valves therein, a thermostat for moving said choke valve toward closed position when the temperature is low, cooperating elements capable of locking said valve in substantially any intermediately open position therechoke valve.

LEONARD D. BOYCE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,215,682 Winkler Sept. 24, 1940 2,394,665 Christian Feb. 12, 1946 Hunt July 9, 1946

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