US1751461A - Carburetor - Google Patents

Description

March 25, 1930.v A A. D. AUSTIN Y CARBURET'OR Filed Aug. 26.,

Patentedl Mer. 2,5', 1930 ALBERT nfAUs'rIN, onron'rnmn, onraoolsr ennnunnron Fig. 1 is a sectional elevation of my device.'

Fig. 2 is a sectional perspective view of the head.

Fig. 3 isa sectional perspective View of the valve.

' `Fig. 4 is a sectional perspective view 'ofthe cap. i

Fig. 5 is a perspective view of the nozzle.

Fig. `6fisa perspective view of the air inlet valve. Y

In general my device consistsof -a casing having air inlet and mixture outlet ports,

said casing an open to the atmosphere, a rotatable. valve within said head, a mixture i distribution cap upon said head, and-a float chamber pivotally mounted upon said casing. The casing consists of a', body portion 7 with an air intake port 8 and a mixture discharge port 9, the latter being controlled by the us al butteriy valve 1 0, and connected to the inta e manifold of themotor 11.

The air intake port is controlled by a novel valve arrangement illustrated in detail inFig. 6. The valve 12 is mounted upon a shaft 13. in an unbalanced manner, that is much the greaterv portion of 'said valve lies uponone side of the shaft. Said shaft is journaled in the air intake port, and said ort is slotted to receive a diaphragm 14 w 'ch closes the upper portion of the air .intakeport as shown in Fig. 1, and which terminatesadjacentthe smaller portion of the valve 12. The, valve 12 is thus unbalanced and will open automatically in response to pressure of air within the air intake port towards the casing 7. Upon one of the protruding ends Van unbalanced weighted valve controlling said air inlet gort, a removable head within I Application filed yAugust 26, 1926. Serial No. 131,788.v

of the shaft 13 is secured a Weight 15 for the purpose of opposing theopening of the valve i 12 witha variable torque upon the shaft 13 thereof, when thereis no pressure within the air intake port S'the valve`12 and weight 15 55 are in the positions shown in Fig. 1, with the vvalve closed. As a partial vacuum is formed `within the casing 7 said valve opens due to the resultant pressure within the air intake port 8, and in the initial co portion of the valve movement the weight imposes increasing resistance' because as said weight approaches the horizontal position the lever arm constantlyincreases. When the valve 12 is in position 12a in Fig. 1 65 which is thejidlin position, the Weight 15 is approximatelyl orizontal and therefore exerting its greatest resistance to the movement ofthe valve. As the-motor is speeded' up, and the partial vacuum within thecasing 70 increases, the"valve12 opens-further and the weight 15 moves above the horizontal and thus gives decreasing resistance to the move ment of the valve. Thus the air ,intake valve 12 operates `automatically to respondto the l demands of the carburetor for air according to the various motor speeds, opening with increasing resistance to the idling position 12a and thence with decreasing resistance to the full open position 12", and between tlie full .80 closed and full open positions it willautov mtically accommodate itself to supply just the amount of air called for bythe speed of the motor. l 85 A cap screw 16 is provided upony saidl weight 15 for the purpose'of mounting wash ers thereupon to regulate the weight opposing the valve movements.

For choking purposes I provide the weight o 15 with a pin 17 and mount upon the shaft 13 a coil spring 18 one end of which hooks overl said' pin 17r and the otherend of which terminates in alop forconveniet attachment .i l tothe regular chokerwire-as usually kThe spring l18 is very light so' that it holds the valve 12 closed for choking purposes' but" allows -it `Vto vopen immediately ,thev motor Starts and the pressure thereupon becomes suiiicient to overcome the spring, even rel. Y

AUpon the opposite end of the shaft 13 from wire-'is not `immediately i the weight 15, asksaid end protrudes from the `air intake port ,I provide a stop leverA 19 which contacts with a lug on the air intake port, not shown inthe drawings, when the valve 12 is fully open.

,The lower end of the casing 7 is open,and is closed by the flange 20, arisingA from which flange is a'nozzle sleeve 21 havinga shoulder 22 upon the uppr end thereof, and four ports 23 a ove sai shoulder.

Rotatably mounted within said sleeve' is valve the upper portion of'which is provided with port-s 24 corresponding to and coactin with the ports 23- in the head. Below s ai ports 24 is a Ventiiri tube portion 25. The

upper end of said valve'is closed by a plug 26, as 'shown in Fig. 1. The lower end of the valve is provided with a lever 27 whereby the valve may be rotated within the head for the vpurpose of opening and closing the ports 23 and 24.

Externally mounting upon the upper end of the stem 21 of the head is a distributing cap 28. This cap is provided with an annular groove 29 which. communicates with all the ports 23 in the head. A plurality of very .small holes 30 are drilled in said cap communicating-'with said groove, and inclined upward, for the distribution of fuel.

A fuel nozzle 31, illustrated in detail in Fig. 5, i's provided positioned within theI valve and terminating within said Venturi tube portion thereof. Said nozzle is mounted upon the iiange2() by means of an arm 32.

Said nozzle is connected by a pipe 33 to a float chamber 34:,.which is pivotally mounted upon the casing 7 by means of lugs 35 andV 36v and abolt 37 The construction of said float chamber is' well known to the art, and smce it is not a part of my invention further than lits mounting, it is not illustrated in `detail in the drawing nor fully described Vlherein. It is fed from the fuel tank by a pipe To remove the condensation that collects in the bottom of carbnretors when trying to Vstart a cold motor, Iy provide the'flanges 20 with a counterbored portion 38 extending beneath the casing end, as shown in Fig. 1, and I provide said casing with a port 39 communicating with said counterbore and terminating above the butteriiy valve v10, thereby insuring that any condensed mixture will be drawn through said port into`the manifold, and incidentally this will assist in starting the motor, acting as a priming device.

y The partialvacuum established within the casing 7 draws 'fuel through the nozzle 31 f and air through the nozzle sleeve 21, which air andfuelare mixed in the Venturi tube 25 and passed through the coacting open ports sire to secure by Letters Patent is:

tributing land thence through the holes 30 into the casing 7. This results in la very homo eneous mixture as the air mixed with the fue breaks up the-latter as it is discharged from the holes 30. Suiicient additional 'air to render the mixture explosive is admitted through the air intake valve 12, which as explained openingaof vthe coacting ports 23 and 21vor closing them altogether as desired.

My invention maybe made of any size, and i constructed of any materials deemed convenient and suitable for a device of this character, and while I ,have illustrated and disclosed a form Aof construction and arrangement of parts found desirable in materializing my invention, I wish to include in this application all mechanical equivalents and substitutes that may fairly be considered' to come within the scope and purview of my invention as defined in the appended claims.

Having `disclosed myy invention so that others may be enabled to construct and to use the same, what I claim as new, and de- 1. In a carburetor: a casing; a head within said casing open to the atmosphere, and having ports therein; a valve rotatable within said head, and having ports to communicate with said former ports in the head; a distributing cap upon said head in communication with coacting ports in said valve and in said head; a Venturi tube within said head; and a nozzle within said Venturi tube.

2. In a carburetor: an integral unit comprising a Venturi tube and a rotatable valve controlling the mixture supply; in combination with a sleeve within which said valve is rotatably mounted, coacting ports in said sleeve and -said valve, and a mixture dishead mounted; upon said sleeve, and having ports in communication with said former ports. Y

3. In a carburetor: a casing; a sleeve within said casing openat its lower end to the atmosphere, andhaving ports at its upper end; a cap upon said sleeve with a plurality of mixture distributing holes therein communieating with said ports; a rotatable valve within said head for controlling the mixture distribution; and a fel supply device with-

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