US1733367A - Carburetor - Google Patents

Description

Oct. 29, 1929. D. J. DICKERS'ON CARBURE TOR Filed May 8, 192

2 Sheets$hee1 D. J. DICKERSON CARBURETOR 1 May 1928 Oct. 29, 1929.

2 Sheets-Sheet gwwmtoo ,D /bem Jf Dmerson Patented 19 29 13150- sr-Ares PATENT. OFFICE DELBEBT J. mcxnnson, or sear LAKE CITY, nrran 'Application filed May 8, i928. Serial 30. 275,988.

My invention relatesto carburetors andhas I and which willincrease the percentage ofvaporization .of the fuel before it is intro-" ducedinto the combustion engine giving bet-,

1 ter acceleration and smoother running for the automobile with less expense and with less eifortrquired by the motor.

These objects I accomplish with the device illustrated in the accompanying drawings in which similar numerals and letters of reference indicate like parts throughout the several views and as described in the specification forming a partof this applica tion and pointed out in the appended claims. In the drawings I have shown the best and most preferred manner of building my invention. Figure 1 is a side elevation of the device. Figure 2 is an end view of the same. Figure 3 is a section on "line 33 of Figure 2. Figure 4 is a side elevation of the device taken from the reverse side-from that shown in Figure 1. Figure 5 is a section on line 5-5 of Figure 1) Figure '6 is a section on line 6-6 of Figu e 4. e a h In thed awings I have shown the float chamber of my carburetor as A in which a float B is pivotally mounted by the pin 1, and with a valve actuating lever 2 formed on the top side of-said float'adapted to engage against the lower end of the check valve 3 and close the'intake port 4 from the intake pipe 5 which leads from the? storage tank or vacuum tank (not shown). The main body member of the carburetor I have shown as C, which body member is secured to the float chamberby the bolts 6. l 4

The said mixing chamber is provided with the usual flange 7 where it is secured'to the intake manifold of the engine, and the mixing chamber 10 is formed byconstructing a cylindrical bore or opening 8 through the body member 0 at an angle to the general level P of the entire device so that any gasoline left therein will drain down into the intake manifold and also so that the incoming air will;

have a downward trend that will give a whirllng motion when it reaches the intake manifold. The air opening end 90f the cylindrical bore 8 is made rectangular and is provided wlth a closure flap valve 11, which valve is pivoted therein by the pivot pin 12, and in normal position is held in the partially open position indicated in Figure 3, but which= valve opens wide open when the engine is running full speed or full load by the increased suction of the pistons and which may be entirely closed as indicated by the dotted lines a-- when the choke lever L is operated. This shuts off all the air and provides a rich mixture for the engine while starting it. A throttle valve 14 is pivoted within the opening end 8 and is operated by the bell crank lever 15 mounted on the outer end of the pivot shaft 16. I then provide a stop boss 17 on one side of the flange 7, and one end18 of the bell crank lever 15 is provided with an adjustment screw 19 which screw 19 is tapered on one end and is provided with a knurled head on the other end. I then bore a hole 20 through the boss 17 connecting the interior of the opening 8 with the outer air,- and provide a closure plug 21 for the outer end of the said hole. I bore a hole 22 at right angles to the hole 20 through one side of the boss 17 into and in open connection with the hole 20 as shown in Figure 5 of the drawings. The tapered end of the screw 19 is adapted toflt into and completely close the hole 22 when the engine is idling, but is moved away from the end of the hole, opening it, to allow air to pass therethrough into the hole 20 and into the mixing chamber when the throttle lever 15 is actuated.

I then provide a boss 2 on the bottom side of the body member C. through which I secure the spray nozzle 25, which nozzle'has the lower end thereof submerged within the gasoline fuel in the float chamber and the top end of which is open to the interior of the mixing chamber 10, and the said nozzle is. so laced within the chamber 10 that the back side 26 thereof is higher than the front side 27. I then bore a transverse hole 28 through a boss 29 formed on the body member G and provide an adjustment screw 30 threaded into the outer end of the said hole.

On the one side of the body member C and above the.boss 29 I form a semicircular casing 31, which casing 31, has a boss 32 on the inner lower side thereof adjacent the boss 29 and I bore a hole 33 through the boss 32 into and in open connection with the hole 28. The adjustment screw-30 completely closes the outer end of the hole 28 and when screwed inwardly closes the hole partially as may be necessary for completely hole 25 and partially break the vacuum therein mixing with the gasoline passing therethrou hbefore it is thrown or drawn out into t e mixing chamber 10. As a control for ,theopening of the hole 33 I provide a lever 35, which lever is mounted on one end of the pivot pin 12, and is rotated therewith. The said lever 35 isformed as shown in Figure 4 of the drawings with one end 36 adapted to partially close the hole 33,-

and with the other end 37 to completely close the hole 33 when it is brought thereover. The intervening space between the ends 36 and 37 is curved slightly from the end 37 to a major curve 38 which allows thehole 33 to be completely open when that portion of the lever 35 is thereover, which is usual at the intermediate speed of the engine giving full flow of air therethrough. A spring 39 is secured to the said lever 35 near the pivoted end thereof and the other end of the said spring is secured to an adjustment screw 40 which screw is threaded through the wall of the semicircular casing 31, and which screw is used to adjust the tension of the spring 39 on the lever 35. Dotted lines b indicate the position the lever 35 will take when the throttle is wide open and the flap valve 11 is wide open allowing the full amount of air to pass therethrough and completely closing the hole 33. As shown in the drawings the lever 35 may be moved in the other direction enough to completely close the hole 33 when the choke lever L is being used in starting the car. The.

choke lever L is mounted on the main body from the casing 31 and is provided with an I excentric cam '41 and a compensating curved leaf sprin 42 is secured to the lower end of the sai lever L. I' then provide a lever 43 mounted on' the end of the pivot pin 12 on the opposite end from the lever 35, which lever 43- is bored and threaded on its'outer free end through which an adjustment screw 44 is passed, with the end of the said screw adapted toengage over the surface of the cam 41. A pin 45 is secured in;the lever the spring presses thereon, which-movement of the lever 43 partially rotates the pin 12 and closes the hole 33 by moving the lever 35 thereover, and closes the opening 9. As soon as the engine starts thervalve 11 will be drawn open by the suction of the pistons actuating the spring 42. Near the medial portion of the lever 43 I pivot a connecting rod 47 which rod is provided with a pivot joint 48 therein and the lower end of the said rod is secured to a small piston 49 which piston is carried in a dash pot 50 which dash.

pot 50 is within and secured on the lower side of the float chamber A. A small hole 51 is bored through the piston 49 to allow passage of fluid therethrough.

The operation of my carburetor is as follows:

When the driver wishes to start his engine he pulls the choke lever, drawing the lever L forward which action moves the cam 41 and forces the spring 42 against the pin 45 closin the flap-valve 11 in the opening 9 and closing the hole 33 by the movement of the lever 35. As soon as the engine starts the suction of the pistons will draw the valve 11 open actuating the spring 42 giving a fluctuating movement of the valve 11 g and with the spnng forcing against the move ment of the said valve.

that it will not open suddenly. When the engine is accelerated to the intermediate speed the curve 38 of thelever 35 is directly above the hole 33, allowing full opening of the hole and directing all the air through the hole 33 and the hole 28 into the hole 25 of thenozzle 25. Also as the throttle is opened by the driver more air is allowed to enter through the holes 22- and 20' into the bore 8. As the speed of the engine is increased by opening the throttle wider the flap valve 11 is drawn proportionately open, .comensurate with the speed, and as the valve 11 opens the hole 33 is slowl closed by the curve nearing the end 37 of t e lever 35 until as the maximum speedof the engine is attained the valve 11 is wide open and the hole 33 is completely closed allowing the maximum amount of air to enter through the openin 9. but shutting off all of the air through t e hole 33 into the bore 25 of the nozle 25, and the nozzle 25 will then be carrying full flow of gasoline.

The spring 39 will draw the lever-35 to starting position when the. throttle is closed and is also a means for regulating the amount that the valve 11 will open under varying suctions from the motor. Also the holes 22 and are drawing the full amount of air therethrough but as the vacuum suction of the engine is greater the air will not be drawn through the holes 22 and 20 with as much velocity as when the engine is in intermediate speed. The dash pot 50 and its component parts control the movement of the valve 11 so that its movement is not as rapid as in some cases.

Having thus described my invention I desire to secure by Letters Patent and claim:

1. In a carburetor the combination of a float chamber; a float mounted within said chamber adapted to control the inflow of gasoline; a main body member mounted above said float chamber having a bore therein at a slight angle to the horizontal plane of the float chamber; a nozzle projecting into said bore and communicating with the gasoline in the float chamber; a transverse bore connecting the bore in the nozzle with an air hole at right angles to the transverse bore;

a flap valve pivoted in one end of said main body member; a throttle valve pivoted in the other end of said bod member; a choke lever mounted onone sideo said body member having a cam formed thereon; a lever mounted on the same pin as the flap valve is pivoted; a curved leaf spring mounted on the lower end of said choke lever; a pin protruding on said lever against which said spring is adapted to operate when the choke lever has been operated; an arm plate mounted on the other end of the pin on which the flap valve is mounted; having the periphery thereof adapted to move over the top of the air hole at right angles to the transverse bore, to open or close it partially or entirely as necessary and actuated by the suction of the pistons; a dash pot mounted within the float chamber; means of'connecting said dash pot with said arm plate to control the movement of the flap valve when the throttle is being operated.

2. In a carburetor the combination of a float chamber mounted below a main body member with the bore of the bod member sloping toward the intake manifo d connection; a nozzle to draw gasoline from the float chamber to themain bore; a set of air holes connecting the interior of said nozzle with the '0 on air; a curved lever ada ted to control t xamount of air passing t roughsaid set of h air into the main bore; a dash pot to control the movement of the flap valve and means to choke the carburetor by closing the flap valve and the air holes at the same time.

In testimony whereof I have afiixed my signature. 7

DELBERT J. DICKERSON.

les; a flap valve to control the flow of v

Images