US2018667A - Carburetor - Google Patents

Description

4 Sheets-Sheet 1 1935- L. B. GRANYTHAM CARBURETOR Filed April 18, 1955 INVENTOR.

Llggd ELET'arLIham.

- @omfi Oct. 29, 1935. L. B. GRANTHAM 2,018,667

' CARBURETOR Filed April 18, 19.53 4 Sheets-Sheet 2 M INVENTOR.

BY M v ATTORNEYS.

Oct-.29, 1935. B, ANTHA 1 I 2,018,667

I GARBURETOR Filed April 18, 1%: 4 Sheets-Sheet s INVENTOR.

'Lhzyd E1. Er anthan ATTORN EYS.

4/ a 2% @VW Oct. 29, 1935. a. GRANT'HAM CARBURETOR Filed April 18, 1935 4 Sheets-Sheet 4 INVENTOR. El E1. Grain-lam.

w, ATTORNEYS.

Patented Oct. 29, 1935 Phillips Petroleum Company,

Bartlesville,

kla., a corporation of Delaware Application April 18, 1933, Serial No. 666,767

18 Claims.

The present invention relates to charge forming devices or carburetors primarily intended for use in connection with internal combustion engines for motor vehicles and the primary object of the invention is to provide a device of this character which acts, upon closing of the throttle, to automatically admit air only to the engine thus tending to cool the engine due to cessation of. explosive charges entering the engine.

A further object of the invention is to provide a charge forming device wherein all flow of fuel is shut off and air only permitted to enter the engine when the throttle is fully closed and the vehicle is traveling under attained momentum thus resulting in a saving in fuel and preventing back firing on long down grades.

A further object of the invention is to provide a device whichwill supply fuel to the engine only when production of power is desired, and admits air only into the engine when power is shut off and the vehicle is traveling under attained momentum such as on down grades or coasting on the level.

A further object is to provide a carburetor of this character wherein when the throttle is fully closed and the vehicle traveling faster than idling speed due to attained momentum, air only will be admitted into the engine, and-after the vehicle slows down to an idling rate of speed, an

idling supply of fuel is admitted to the engine automatically and without attention from the operator.

A further object of the invention is to provide an automatically operable charge forming device acting upon suction of the engine when the throttle is fully closed, to shut off all fuel supply and permit air alone to enter the engine.

A further object resides in the novel arrangement whereby an idling supply of fuel is ad-' 0 mitted to the engine when the vehicle speed equals the idling speed of the engine.

A further objectof the invention is to provide a device of this character in the form of anattachment adapted to be interposed between the" carburetor and intake manifold of an internal combustion engine and acting to automatically shut off the fuel supply and permit air only to enter the engine when the vehiclespeed exceeds the idling speed of the engine.

Other objects and advantages of the invention will be apparent from the following detailed' de-' scription, taken in connection with the accompanying drawings forming a part of this specification and in which Vdrawings;; Figure 1 is a central vertical section thru the preferred form of carburetor with the parts in an idling ppsition with the fuel supply valve slightly open to permit an idling supply of fuel to feed to the engine.' This view shows the throttle control in a closed position with the throttle valve operating cams in their upward limit of movement.

Figure 2 is a central vertical section similar to Figure 1 but showing the throttle valve in its full open position imparting opening movement 10 to the fuel supply valve.

Figure 3 is a fragmentary section taken at a p right angle to the showings in Figures 1 and 2 and showing the throttle valve opened by the suction of the engine such as when the speeclofl the vehicle exceeds the idling rate of speed of.

the engine.

Figure 4 is a horizontal section taken substantially on the line 4-4 of Figure 1.

Figure 5 is an enlarged'fragmentary detail sec- 20.-

tion showing the manner in which the removable .metering nozzle may be placed inthe jet o'r guide tube. Figure 6 is a central vertical section thru a slightly modified form of carburetor andshowing the parts in an idling condition with the throttle fully closed and permitting an idling 'supply o'f fuel mixture to enter the engine.

Figure 7 is a vertical section similar to Figure. 6 but showing a full open throttle position of the throttle valve and gasoline or fuel valve.

Figure 8 is a fragmentary vertical section taken at a right angle to the showings in Figures 6 and 7 and showing the parts ina coasting position with.- the throttle fully closedand met i throttle valve raised by suctionof theengine to shut oif all fuel supply to'the engine. 1

,Figure 9 is a, horizontal section on the .line

99 of Figure 6. Figure 10 is an enlarged detail sectional view Q on the line lM-lll'of'FiguriG.

Figures 11 to 17 inclusive show'a form of attachment adapted to be connected between the carburetorand intake manifold. Figure 11 shows a, verticalsection thrufthe' attachment device such aswh en the usual throttle at the carburetor is closed or at, an idling position and the speed of the vehicle exceeds the idling s'peed'of the engine thu sperrnitting air-alone to enter the engine. J f f Figure 12 is a sectional view"similarft'o Fig-'- ure 11 but showing the parts in'a position when the throttle-valve of the carburetor is fully open.-

Figure {13 is top plan, view of the' lower por'-" tion o'f the attachmentfand showing'a fragmenf' tary portion of the air control valve broken away.

Figure 14 is a fragmentary sectional view on the line i l-I4 of Figure 12.

Figure 15 is a vertical sectional view at a right angle to the showings in Figures 11 and 12 and showing the throttle in a closed or idling position and the fuel control valve of the attachment slightly raised by the suction of the engine to permit passage of an idling supply of fuel to the engine.

Figure 16 is a view in side elevation of the attachment applied to an up-draft type of carburetor and with the parts in an idling position as shown in Figure 15.

Figure 17 is a view in side elevation of the attachment shown applied to a down-draft type of carburetor. 0

Referring to the drawings in detail, and wherein similar reference characters designate corresponding parts thruout the several views, the letter A may generally designate the form of carburetor shown in Figures 1 to 5 inclusive, the letter B- the form of carburetor shown in Figures 6 to 10 inclusive, and the letter C the form of attachment shown in Figures 11 to 17 inclusive.

Referring first to the form of carburetor A, the numeral 5 designates the carburetor body which is preferably of tubular formation being open at its upper end and closed at its lower end by a bottom wall 6 preferably provided with a threaded opening 1 arranged axially of the tubular body portion 5. Projecting laterally from the lower end of the body portion 5 is the air intake 8 in which is provided the usual choke valve 9. Preferably formed integral with one side of the body portion 5 at the lower end thereof is a hollow extension l0 providing a float chamber ll having a fuel supply inlet i2 controlled by afloat i3 serving to regulate the height of fuel'in the'chamber ll. Forming communication between the float chamber i I and the opening 1 is a fuel supply duct M which may be formed in the bottom wall 6. The upper open end of the tubular body portion 5 is formed with the usual attaching or. coupling flange l5 which may be suitably apertured for attachment of the carburetor to the intake manifold of an internal combustion engine whereby the manifold has communication withthe upper end of the carburetor body.

Arranged to extend axially upwardly in the tubular body portion 5 isa jet or guide tube i6 having an externally threaded lower end for threading into the threaded opening I in the bottom wall 6 whereby the lower end of the tube is in communication with the fuel supply duct M. The lower end of the opening 1 may receive a drain plug IT. The tube 16 is provided substantially midway its height with an air cone l8 and slightly above this cone with a cone-shaped deflector l9 having its apex directed downwardly. The tube It is provided with. air inlet openings 20 arranged below the cone l3, and outlet openings 2| arranged between the cones l8 and ID.

The tubular body portion 5 is provided above the open upper end. of the tube I 6 with an internal flange 22 which is beveled at its inner edge to provide a circular opening arranged axially above the tube l6.

Reciprocally uided in the upper portion of the tube i6 is a throttle valve including a disc 23 vertically movable thru the opening formed by the internal flange 22, and '9. depending plunger portion 24 slidably fitting in the tube l6. This throttle valve disc 23 has its circumferential edge beveled and is of a diameter to provide an annular passageway about the disc when the disc aligns with the flange 22 as in Figure 1. This annular passageway formed by providing a 5 clearance between the disc 23 and internal flange 22 allows for an idling supply of fuel to pass the disc when the disc is in an idling position as in. 1 Figure 1.

Encircling the upper portion of the tube I6 10 with its lower end engaging the cone l9 and its I upper end engaging the disc 23 is a coil spring 25 serving to normally return the throttle valve disc 23 to its idling position in the flange 22. This coil spring 25 is of such length that when 15 fully expanded as in Figures 1 and 3, the disc 23 is supported by the spring in an idling position as in Figure 1.

Journaled in the upper portion of the tubular body 5 to extend diametrically thru the tubular 20 6 body in spaced relation above the flange 22 is a control shaft 26 having fixedly mounted thereon a pair of throttle valve cams 21 adapted to en-' gage the upper edge of the disc 23 and force the disc downwardly from an idling position as 25 in Figure l to an open throttle position as in Figure 2. The control shaft 26 is provided at one end with an operating lever 28 which may be connected in any suitable manner with a control rod operated by a hand throttle lever and an a accelerator pedal as in usual practice. The control shaft 26 is preferably rotatable thru of rotation by the lever 28, with 45 of the movement serving to move the throttle valve from an idling to a full open position. When the throttle lever 28 is in a full closed throttle'position, the cams 21 are moved out of contact with the upper limit of movement of the disc 23.. When the throttle is opened, the throttle valve is lowered against the tension of the spring 25 and the force of the air being drawn thru the air intake tube.

The guide tube l6, immediately below the air openings 20 is internally threaded as at 29 to receive a removable externally threaded nozzle 30 45 having a constricted upper portion providing a conical valve seat 3| as shown more clearly in Figure 5. Reciprocally guided in the lower portion of guide tube i6 is a fuel control valve 32 having a conical seat portion adapted to engage 5 upon the conical valve seat 3| and a stem portion 33 which projects upwardly thru the nozzle 30 with its upper end adapted to engage the lower end of the plunger 24. The control valve 32 has sui able ports therethru to permit passage of gaso- 55 line. The lower end of the tube Wis internally threaded as at 34 for receiving a tubular stop plug 36. Arranged in the tube l6 between the valve 32 and plug 36 is an expansion coil spring 36 acting to normally seat the valve and shut oil no escape of fuel thru-the nozzle 30. Adjustment of the plug 36 will vary the closing tension of the spring 36 upon the valve 32.

Journaled in the upper portion of the tubular carburetor body portion 5 in right angular reas is'closed at its lower end. Encircling the guide pin ill with its lower end engaging the base of the pocket 42 and its upper end engaging the head 40 is an idling adjusting coil spring 43 for retaining the throttle valve disc 23 in an idling position when the throttle is fully closed. The tension of the idling spring 43 may be varied by means of the cam 39 on the adjusting rod 31. The tension on the spring 43 is adjusted so as to slightly overcome the tension of the fuel valve spring 36 and the air suction thru the carburetor whereby the throttle disc 23 is returned to an idling position and slightly unseat the valve 32 when the throttle is fully closed.

In operation of the carburetor A, when the engine is idling with the throttle fully closed, the carburetor will be in a condition as shown in Figure 1 with the fuel control valve 32 slightly opened permitting an idling supply of fuel to escape at the nozzle 30 and mix with the air entering the intake 8 and this mixture permitted to pass thru the annular passageway about the throttle disc 23 into the intake manifold of the engine. Upon opening of the throttle, the cams 21 engage the disc 23 and force the disc downwardly against the tension of the spring 25 and causing opening of the fuel control valve 32 by the plunger 24 forcing the stem 33 downwardly. Figure 2 shows a full open throttle position of the carburetor. Upon coming to a down grade or when the vehicle is traveling under attained momentum from high speed, the operator fully closes the throttle allowing the throttle valve, to be raised by the spring 25, and if the speedof the vehicle exceeds the idling speed of the engine, the throttle valve will be raised by suction to its full opening position as in Figure 3. This raising of the throttle valve relieves all pressure on the fuel control valve 32 which is immediately closed by the spring 36 thus shutting off all fuel supply to the carburetor, and allowing air only to be drawn into the engine. When the coasting speed of the vehicle is lowered to the idling speed of the engine, suction thru the carburetor will be greatly reduced and allows the throttle valve to be returned by the idling spring 43 to an idling position and slightly opening the fuel valve 32. The cycleof operation of the carburetor is of course obtained with the gearing of the vehicle in mesh at all times.

Referring particularly to the Venturi effect formed by the cones l8 and IS, the cone IE will direct a considerable amount of air thru the air openings to the outlet of the nozzle 30 so that the velocity of air at this point will be very high thus insuring perfect atomization of the fuel which is then directedoutwardly by the deflector cone IQ for mixing with additional air at the wall of the tubular body portion 5.

The removable nozzle 30 is designed to give the proper gasoline flow at any given throttle opening and will be available in various inside diameters foruse upon different types of engines.

Referring now to the form of carburetorB.

shown in Figures 6 to 10 inclusive, the carburetor is formed with'a tubular body,portion 5' closed at its lower' end by abottom wall 6' formed with a threaded opening 1' arranged axially of the tubular body portion. Projecting from the lower end of the body portion 5' is an air intake 8' in which is provided the usual choke valve 9'.

Formed integral with the lower portion ofthe body portion 5' is an extension In providing a floatchamber ii having a fuel supply inlet l2, controlled by the float I3. A duct I4 provides communication between the float chamber and the threaded opening 1'. The upper open end of the tubular body portion 5 is provided with the usual attaching flange l5 for attachment of the carburetor to the intake manifold of an internal 5 combustion engine.

Arranged axially within the lower portion of the tubular body portion 5' is a jet or guide tube I6 having an externally threaded lower end for threading into the opening 1' whereby the lower open end of the tube communicates with the duct M. The lower end of the opening 1' may be closed by a suitable drain plug I1. The tube I6 is provided substantially midway its height with an air cone l8 and directly above this cone with a deflector cone l9. The tube I6 is provided below the apex of the cone l8 with air inlet openings 20', and between the cones with outlet openings 2!.

The tubular body portion 5' is provided above 20 the cone l9 with'an internal annular flange 22' providing an upwardly flaring valve seat 45 arranged concentric to the tube l6.

Slidably guided upon the upper end portion of the guide tube I6 is a throttle valve embodying 25 a disc valve 46 for engaging upon the seat 45 and a sleeve portion 41 slidably fitting over the guide Hi. This sleeve portion 41 projects above the disc 46 for a purpose to be subsequently described.

Journaled in the upper portion of the tubular body portion 5' to extend diametrically therethru above the internal flange 22' is a throttle control shaft 48 provided with a pair of spaced apart cams 49which are adapted to engage the upper surface of the disc 46 and control upward movement of the disc by the suction of the engine. One end of the shaft 48 is providedwlth a throttle lever 50 so connected to an accelerator or hand throttle, as to impart 90 of rotation 40 to the shaft 48.

Idling adjustment means is provided for controlling raising of the disc 46 when the engine is idling, and this means embodies an idling coil springil which encircles the upper end of the. throttle valve sleeve 41 with its lower end bearing upon the disc 46. Fitting upon the upper end of spring 5| is a flanged washer '52 adapted to work between the cams 49. Threaded thru the body portion 5' above the flange 22' 'in right 50 angular relation to the shaft 48 is an idling adjustment red 53 formedat its inner end with an annular groove 54 and at its outer end with an operating knob 55. Pivotally mounted above the rod 53 as between suitable lugs 56 is a bell crank lever having the free end ofits arm 51 engaging in the annular. groove 54, and its arm 58 extend ing downwardly and inwardly and forked atits free end providing fingers- 59 adapted to bear upon the flanged washer'52. By. observing-Figure 6 it will be .seenthat when the rodl53-is threaded outwardly, thefingers 53- will move downwardly to increasethe tension on the spring 5|, and when the rod is threaded .inwardly the fingers will be raised-.to'reduce *tensionwon" the H fully closed. It may here be well to state that' when the earns 49 are in-theiclosed throttle posl tion asin Figure 1. thecams do not-force the disc 46 upon'theseat 45' but provide=a slight clearance permitting slight raising of the discr' When the engine is idling; with the throttle fully I closed, the incoming air raises the disc 46 against the tension of the spring 5|, and thetension of this spring, adjusted by the rod 53, regulates the rate of idling speed.

The guide tube It is internally screw threaded at a point just below the air openings 2| for threaded reception of a tubular metering nozzle 68 provided at its upper end with a conical valve seat 6 I.

Reciprocally movable in the upper portion of the guide sleeve I6 is a fuel control valve embodying a cylindrical stem portion 62 slidably fitting in the tube I6 and provided at its upper end with a cylindrical head portion 63 slidably fitting in the sleeve portion 41 of the throttle valve. The lower end of the stem portion 62 is reduced in diameter and provided at its extremity with a tapering seat 64 for engaging upon the seat 6|. The stem portion 62 is provided with an axially disposed idling fuel passageway 66 which extends upwardly into the head portion 63 and communicates with the transverse passageway 66 which opens into an annular passageway 61 formed circumferentially of the head portion. The sleeve portion 41 of the throttle valve is provided above the disc 46 with suitable openings 68 which provide escape openings for an idling supply of fuel when the throttle is fully closed as in Figure 6.

The control shaft 48 is provided between the cams 49 with a fuel valve control cam 18 adapted to engage the upper end of thehead 63 for closing the fuel control valve in unison with closing of the throttle valve. Encircling the head f portion 63 of the fuel control valve is an expansion coil spring 1| having itslower end bearing upon the, upper end of the sleeve 41 and its upper end acting against an annular flange 12 provided on the head 63. This spring 1| acts 'as a lift spring normally urging the head 63 into engagement with the cam 1|).

The cams 49 and 10 bear a specific relation to one another whereby when the control shaft 48 is rotated to a full closed throttle position, the disc 46 will be lowered by the cams 49 and the fuel control valve will be lowered by the cam 10 so as to prevent escape of fuel thru the outlet openings 2| into the chamber below the flange Referring now to the manner of operation of thecarburetor B, with the engine running and the throttle fully closed, the carburetor will be in a position as shown in Figure 6. In this idling position, the seat 64 of the control valve stem 62 is engaging upon the seat 6| of the nozzle and the disc 46 of the throttle valve is slightly raised by the suction of the engine againstthe tension.

' of the idling spring 5| and allowing a small amount of air to pass about the disc.

With the fuel control valve fully seated by the cam 10, raising of the disc 46 by suction of the engine aligns the openings 68 in the sleeve 41 with the annular passageway 61 allowing an idling supply of'fuel to. be drawn upwardly thru the idling fuel passageway 65 for mixing with the air drawn past the slightly raised disc 46. Upon opening of the throttle, the cams 49 swing thru 90 of movement from a closed to an open throttle position and this I opening of the throttle moves the'low side of the cam 18 against the control valve head 63 allowin opening of the control valve and permitting es-' cape of fuel thru the. outlet openings 2|'.- The suction of the engine raises the throttle disc 46,

and Figure 7 shows the carburetor in a full open throttle position. When coasting down grades,

nular valve seating face 89.

or when the vehicle is traveling under attained momentum, the operator fully closes the throttle and rotates the shaft 48 so that the cams 49 and 10 are in a position as in Figure 8. In this position, the fuel control valve is fully closed upon the seat BI and so long as the speed of the vehicle exceeds the idling speed of the engine, the disc 46 is raised by suction of the engine and disaligns the openings 68 with the idling fuel passageway 61 so that all fuel supply is shut off and only air is permitted to enter the engine. When the speed of the vehicle is reduced to idling speed of the engine, the suction of the engine is greatly reduced allowing'the idling spring 5| to lower the disc 46 to an idling position so that the openings 68 again align with the annular idling fuel passageway 61 whereupon combustion is again resumed at an idling rate of speed. With the cams 49 and 10 in a position as in Figure 8, the carburetor will be automatic in its operation to allow only air to enter the engine when the vehicle speed exceeds idling speed of the engine, and automatically supply an idling quantity of fuel to the engine when the speed of the vehicle is reduced to the idling speed of the engine.

Referring now to the form of carburetor attachment 0 shown in Figures 11 to 17 inclusive,

draft type of carburetor generally designated by the letter D, the'upper end of the section 14 is formed with threaded sockets for receiving cap screws 11 whereby the device may be connected to the intake manifold 18 of an internal combustion engine. The lower side of the section15 is provided with threaded sockets for receiving cap screws 19 for connectionof the carburetor to the device.

The section 14 is provided with a chamber communicating with the intake manifold 18, while the lower section 15 is formed with a circular chamber 8| of a diameter smaller than that of the chamber 80. The chamber 8| has communication with the charge outlet tube 82 of the carburetor whereby the fuel charge is permitted to pass thru the device C to the intake manifold.

Secured at its lower end as by suitable arms 88 to the lower end of the section 15 and extending axially thru the chamber 8| into the chamber 88 is a guide stem or rod 84 providing a guide for an air control valve 85 and a fuel control valve 88.

The section 15 is formed with an annular channel which, when assembled with the section 14 provides an annular passageway 81. Communicating with the annular air passageway 81 is a suitable number of air intake passages 88 which extend in upwardly and inwardly relation toward the axis of the chamber 80 and open upon an an- These air. intake passages 88 are closed by the air control valve 85 embodyinga tubular hub portion 98 guided on the stem 84 and connected by arms 9| to an anis lowered. Thus it will be seen that the valve 75 85 serves to control passage of air into the chamber thru the intake openings 88. I

The fuel control valve 86 is in the form of a solid disc valve slidably guided on the lower portion of the stem 84 and adapted to engage upon an annular valve seat 93 at the lower end of the. chamber 8| to .control communication between this chamber and the carburetor tube 82.

Secured in any preferred manner in the chamber 8| is a support 94 of open construction so as not to obstruct passage of fuel therethru and this support is provided with depending lugs 95 for pivotal mounting of a pair of valve operating levers 96.

These levers 96 are pivoted intermediate their ends as upon the pivot pins 81 and at one end are adapted to freely engage the valve disc 86. The

opposite end of the levers 96 are forked as shown more clearly in Figure 14 and the forked ends of the levers have pin portions adapted to engage in the annular groove of a collar 98 provided on the lower end of the tubular hub 90. By observing Figure 11, it will be seen that upon raising of the control valve 85, the operating levers 96 will act to force the fuel valve 86 upon the seat 93. When the valve is engaging upon the seat 89 as in Figure 12, the levers 96 will be in a position permitting raising of the valve disc 86 by the suction created by the engine. It may here be well to note that when the valve disc 86 is engaging upon the seat 93, that communication is shut off between the carburetor and intake manifold so that no fuel mixture enters the intake manifold.

An idling adjusting means is provided for retaining the air control valve 85 seated under.

idling speed of the engine and this-means embodies an idling spring 99 encircling the upper end of the guide stem 84 and bearing upon the tubular hub of the control valve. Extendin diametrically thru the chamber 80 and rotatably mounted in the section I4 is an idling adjustment rod I00 provided at its outer end with a suitable rotating knob IN. The intermediate portion of the rod I00 is provided with a cam or eccentric I02 adapted to engage with a cap plate I03 fitting Over the upper end of the idling spring 99.

Rotation of the rod I00 will vary the tension on the spring 99 whereby the air control valve 85 may be held seated when the throttle is closed or in an idling position.

- The carburetor is provided with the usual throttle valve I04 arranged in the tube 82 and mounted on the shaft I05 projecting exteriorly of the tube 82.

. Rotatably journaled in the attachment section I4 to extend diametrically thru the chamber 80 in right angular relation to the idling adjustment rod I00, is a cam shaft I06 provided with a pair of cams I01 connected by a bridge piece I08 permitting rotation of the cam shaft without interfering with the rod I00. These cams I01 are adapted to engage an annular flange 90' formed about the upper end portion of I the tubular hub 90 \of the air control valve 85.

A coupling means is provided for controlling operation of theshaft I06 upon opening and closing of the throttle valve I04 and this means acts bracket I II clamped about the charge outlet tube 5 82 of the carburetor is an operating lever II2 which is provided closely adjacent its pivoted end with a segmental-shaped projection I I3 for bearing engagement upon the periphery of the disc I09 and adapted to engage in a segmental-shaped in depression II4 formed in the periphery of the. disc. Pivotally connected at one end to the free end of the lever H2 is a link II5, the opposite end of which is pivotally connected to a crank arm II6 fixed to the outer end of the cam shaft 15 I06. A tensioning spring 1 is connected between the lever H2 and the body portion of the attachment and acts to normally urge the lever toward the control disc I09 so that the projection II3 contacts the disc at all times. inFigure 16, when a pull is exerted on the throttle rod H0 in the direction of the arrow to open the throttle, the projection II3 will ride out of the depression H4 and so swing the lever II2 as to impart rotation to the cam shaft I06.

The carburetor D is provided with an air cleaner E embodying a carburetor sect-ion H8 and an attachment section H9. The main or carburetor section H8 is provided with a tube I20 which connects with the main air intake I2I of the car- 30 buretor, while the minor or attachment section I I9 of the cleaner is connected by an air tube I22 with the annular air passageway 81 of the attachment. This providing of separate air cleaner sections for the carburetor and the at- 35 tachment is to prevent likelihood of the fuel mixture being drawn from the carburetor thru the main air intake I2I and'then thru the air intake tube I22 into the engine when the parts are in a condition as shown in Figure 11. With the 40 double sectioned air cleaner,'no back suction will be created in the tube I20 when a suction is created in the air tube I22.

Figure 17 shows the attachmentC in an inverted position of use for connection between a 45 down draft type of carburetor F, and its manifold.

Referring now to the operation of the attachment 0, Figure 11 shows a coasting condition when the throttle valve I04 is fully closed and the speed of the vehicleexceeds the idling speed of the engine. In this position, air entering the air intake passages 88 due to the suction of the engine, raises the air control valve 85 so that the levers 96 operate to close the fuel valve 86 thus 55 shutting off all fuel supply and permitting only air to enter the engine. When thethrottle valve I04 is fully opened as in Figure 12, the cams I01 hold the air valve 85 upon its seat 89 and so position the levers 96 as to permit the fuel disc 86 to 60 be free to raise by the suction of the engine. Withthe throttle closed, when the vehicle speed is lowered to the idling speed of the engine so that the suction created by the engine is reduced, the idling spring 99 will seat the air valve 85 so 5 that the fuel valve 86 may be raised slightly to permit an idling supply of fuel to feed to themgme.

The coupling means between the throttle valve shaft I05 and cam shaft I06 is such 'as to rotate As shown 30 Thus it will be seen that in all forms of the invention that an arrangement is provided whereby all flow of fuel is automatically shut off when the throttle is closed and the speed of'the vehicle exceeds the idling rate of speed of the engine. It will also be noted that the device is automatic in its operation to supply an idling fuel supply to the engine when the vehicle speed is reduced to the idling rate of speed of the engine.

Changes in detail may be made to the forms of invention herein shown and described, without departing from the spirit of the invention or the scope of the following claims.

I claim:

1. In a charge forming device for internal combustion engines of motor vehicles, a fuel control valve, a throttle valve member adapted to be opened by suction of the engine, movement controlling means for the throttle valve member, means for automatically closing the fuel control valve upon opening of the valve member by suction of the engine, and means for normally retaining the throttle valve member in an idling position for supplying an idling quantity of fuel to the engine when the vehiclespeed equals the idling speed of the engine.

2. In a charge forming device for internal combustion engines of motor vehicles, a fuel control valve, a throttle valve member adapted to be opened by suction of the engine when the vehicle speeds exceeds idling speed of the engine, cam means for controlling movement of the valve member, means automatically closing the fuel control valve upon opening of the throttle valve member by suction of the engine, and means normally returning the throttle valve member to an idling position to permit an idling supply of fuel to feed to the engine.

3. In a charge forming device for internal combustion engines of motor vehicles, fuel feeding control means, a throttle valve member adapted to be opened by suction of the engine, throttle control means for controlling movement of the valve member for production of power, and means for controlling the fuel feeding control means upon movement of the throttle valve member to shut off feeding of fuel when the valve member is opened by the engine suction and to permit feeding of fuel when the valve member is moved by the throttle control means.

4. In a carburetor having a fuel inlet and an air inlet, a throttle valve for controlling feeding of the fuel mixture to the engine and adapted to be opened by suction of the engine, cam means for controlling the mixture feeding position of the throttle valve, means normally returning the throttle valve to an idling position, and a fuel control valve associated with the throttle valve for shutting off the fuel supply upon opening of the throttle valve by engine suction.

5. In a carburetor embodying a tubular casing, a jet tube in the casing, a fuel control valve slidable in the jet tube, a throttle valve slidably associated with the jet tube and adapted to be opened by suction of the engine, cam means for controlling charge feeding positions of the throttle valve, adjustable idling return means for the throttle valve, and cooperative means between the valves for feeding of an idling supply of fuel when the throttle valve is in an idling position.

6. In a carburetor embodying a hollow body portion for attachment to an intake manifold, a jet tube extending into the hollow body portion and having a fuel inlet, a fuel control valve reciprocally guided in the jet tube, a'throttle valve slidably guided on the jet tube, said throttle valve adapted to be opened by suction-of the engine, cam means acting upon the throttle valve to control the charge feeding position of the valve, adjustable idling return means for the throttle 5 valve, and means permitting feeding of an idling supply of fuel when the throttle valve is in an idling position, said idling fuel supply being entirely shut off upon opening of the throttle valve by the engine'suction. 1

7. A carburetor comprising in combination, a tubular body portion for attachment to an intake manifold, a guide tube in the body portion and having a fuel inlet at its lower end, a fuel valve guided in the lower portion of the tube for con- 15 trolling escape of fuel thru the intermediate portion of the tube into the body portion, a throttle valve guided in the upper portion of the tube for opening the fuel valve upon a downward throttle opening movement of the throttle valve, and :0 control means for opening the throttle valve with a downward movement, said throttle valve adapted to be raised from an idling position by suction of the engine and permit full closing of the fuel valve.

8. A carburetor comprising in combination, a tubular body portion for attachment to an intake manifold, a guide tube in the body portion and having a fuel inlet at its lower end, a fuel valve guided in the lower portion of the tube for conr trolling escape of fuel thru the intermediate portion of the tube into the body portion, a throttle valve guided in the upper portion of .the tube for opening the fuel valve upon a downward throttle opening movement of the throttle valve, throttle control cams for opening the throttle valve with a downward movement of the valve, said throttle valve adapted to be raised from an idling position by suction of the engine and permit full closing of the fuel valve, an idling 40 spring normally returning the throttle valve to an idling position to cause slight opening of the fuel valve, and means for adjusting the tension of the idling spring.

9. In a carburetor, a tubular body portion for 45 attachment to an intake manifold, a guide tube mounted axially in the body portion and having a fuel inlet at its lower end, a throttle valve guided in the upper portion of the tube, means normally raising the valve to an idling position, 60 a fuel valve guided in the'lower portion of the tube for controlling escape of fuel thru the intermediate portion of the tube into the body portion, spring means normally urging the fuel valve upwardly toa closed position, throttle control 55 means for lowering the throttle valve and causing opening of the fuel valve, and adjustable idling v tensioning means for the throttle valve permitting raising of the throttle valve by the engine suction when the engine exceeds an idling rate 60 l of speed with said throttle control means in a closed position.

10. A carburetor comprising a tubular body portion having an internal 'ring flange, a jet tube. mounted in the body portion axially of the ring 65 flange and having fuel escape openings intermediate its ends, a throttle valve embodying a disc movable thru the ring flange and a plunger portion guided in the upper end of the jet tube, yieldable closing means normally urging the 70 throttle valve upwardly to an idling position with the disc aligning within the ringflange, throttle control ineans for opening the throttle valve against the action of the closing means, a fuel valve guided in the jet tube below the fire! escape 76 openings, spring means normally urging the fuel valve upwardly to a closed position, a stem on the fuel valve engageable by said plunger portion for opening the fuel valve upon lowering of the throtte valve, said throttle valve to be raised above the ring flange by the auction of the engine and permit full closing of the fuel valve, and idling adjustment means for returning the throttle valve to an idling position with the fuel valve slightly opened when the throttle control means is closed and the engine is running at an idling speed.

11. A carburetor comprising a tubular body portion having an internal ring flange, a jet tube mounted in the body portion axially of the ring flange and having fuel escape openings intermediate its ends, a throttle valve embodying a disc movable thru the ring flange and a plunger portion guided in the jet tube above the fuel escape openings, a coil spring supporting the throttle valve in an idling position with the disc aligning within the ring flange, throttle opening cams engageable with the disc for opening the throttle with a downward movement, a fuel valve guided in the jet tube below the fuel escape openings and having a stem engageable with said plunger portion for opening the fuel valve upon lowering of the throttle valve, spring means normally urging the fuel valve upwardly to a. closed position, said throttle valve to be raised by suction of the engine from an idling position with the disc aligning within the ring flange, an idling spring acting against the upper side of 'the throttle valve, and means for adjusting the tension of the idling spring for causing slight opening of the fuel valve when the throttle valve is in an idling position with the throttle control means closed.

12. A carburetor comprising a tubular body portion having an internal ring flange, a jet tube mounted axially in the body portion and having fuel escape openings intermediate its ends, a throttle valve embodying a disc movable with clearance thru the ring flange and a plunger portion guided in the upper end of the jet tube, a coil spring yieldably supporting the throttle valve with the disc aligning within'the ring flange, a control shaft journaled in the body portion above the ring flange, cams mounted on the control shaft and engageable with the throttle valve disc for opening the valve with a downward movement, said cams when in a raised closed position permitting the throttle valve to be raised by the suction of the engine, said plunger portion of the throttle valve having an upwardly opening pocket, an idling coil spring arranged in said pocket,.a guide pin extending into the upper end of the idling'spring and havinga head at its upper end forming an abutment for the upper end of the idling spring, an idling adjustment rod journaled in the body portion above the ring flange, a cam on the inner end of the adjustment rod and engageable with the head of the guide pin for adjusting tension on the idling spring, and a spring seated fuel valve guided in the jet tube below the fuel escape openings therein and adapted to be closed upon upward movement of the throttle valve from an idling position.

being provided intermediate its ends with air inlet openings and above these openings with fuel outlet openings, an air collector cone' encircling the jet tube between the openings, a deflector cone encircling the jet tube above the fuel 5 outlet openings, a nozzle in the jet tube below the air inlet openings, a fuel control valve for controlling escape of fuel thru said nozzle, spring means normally closing the fuel valve, a throttle valve guided in the upper end of the jet tube embodying a plunger portion closing the upper end of the tube and a disc portion movable thru the ring flange, and control means for the throttle valve, said throttle valve when opened to cause opening movement to be imparted to the 15 fuel control valve.

14. A carburetor comprising a tubular body portion for attachment to an intake manifold, a jet tube mounted axially in the body portion and having fuel escape openings intermediate its ends, a tubular nozzle in the tube below said 7 openings, a fuel valve guided in the upper end of the jet tube for controlling escape of fuel thru said nozzle, a throttle valve slidably guided on the upper end of the jet tube and adapted to be opened by suction of the engine, and throttle control means for controlling opening movement of the throttle valve.

15. A carburetor comprising a tubular body portion for attachment to an intake manifold, 80 a jet tube mounted axially in the body portion and having fuel escape openings intermediate its ends, a tubular nozzle in the tube below said openings, 2, fuel valve guided in the upper end of the jet tube for controlling escape of fuel thru 85 said nozzle, a throttle valve slidably guided on the upper end of the jet tube and adapted to be opened by suction of the engine, throttle control means for controlling opening movement of the throttle valve, and means operable upon closing 40 of the throttle control means for admitting an idling supply of fuel to the engine.

16. A carburetor comprising a tubular body portion for attachment to an intake manifold, a jet tube mounted axially in the body portion and 4 having fuel escape openings intermediate its ends,

a tubular nozzle in the tube below said openings, a fuel valve guided in the upper end of the jet tube for controlling escape of fuel thru said nozzle, a throttle valve slidably guided on the upper end of the jet tube and adapted to be opened by suction of the engine, throttle control means for controlling opening movement of the throttle valve, and means operable upon closing of the throttle control means for by-passing an idling supply of fuel when the engine is running at idling speed and shutting off the idling supply of fuel when the engine speed exceeds the idling rate of speed of the engine.

17. A carburetor comprising a tubular body portion for attachment to an intake manifold, a jet tube mounted axially in the body portion and having fuel escape openings intermediate its ends,

a tubular nozzle in the tube below said openings, a fuel valve guided in the upper end of the jet tube and having a stem portion for controlling escape of fuel thru the nozzle, a throttle valve slidably guided on the upper end 'of the jet tube and adapted to be opened by suction of the engine, an idling tensioning spring normally 0105- ing the throttle valve, tension adjusting means for said spring, spring means acting to normally open the fuel valve, throttle control means for controlling opening movement of the throttle valve, means associated with the throttle control means 15 for closing the fuel valye andbyrpass meansper:

closing of the-.fuel valye. s

18. A carburetor comprising a tubular body portion for attachment to anintake -manifold,.a jet tube mounted axiallyin the body portion and having fuel escape openings intermediate its ends, a tubular nozzle inthe tube below-said openings, a fuel valve embodying a stem portion guided in the upper end of the jet tube and a head portion at the upper end of the stem, said stem portion having an idling fuel passageway therethru opening into an annular idling fuel passageway about the head portion, said stem portion to seat mltting' feedingrof an idling fuel. supply-upon upon the nozzle for controlling escape of fuel thru said fuel escape openings, a throttle valve embodying a sleeve portion slidably guided on the upper end of the jet tubeand haying idling fuel escape openings for registering with said annular idling fuel passageway, said throttle valve adapted to be opened by suction of the engine, an idling spring acting to'norrnally close the throttle valve, spring meansv actingto normally open the fuel valve, a control shaft journaled transversely-of the upper portion of the tubular body portion, cams on the control shaft forcontrolling opening movement ofthe throttle valve, and a cam on the control shaft for closing the fuel valve and permitting escape of an idling supply of fuel thru the idling fuel escape openings in the throttle valve sleeve upon movement of the throttle valve to an idling position. I

LLOYD B. GRANTHAM.

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