US1576620A - Carburetor - Google Patents

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2 Sheets-Sheet 1 ////////////A17AI//// 767 l-ni gi V gag/Q71 w March 16 1926.

G. E. RIBLE T CARBURETOR Filed April 13, 1922 March 16,1926. 1,576,620

G. E. RIBLET v C ARBURETOR Filed April 13, 1922 2 Sheets-Sheet 2 Patented Mar. 16, 1925.

Uli'l' STATES enonen E. BIBLET, or Earn, PENNSYLVANIA.

CARBURETOR.

Application filed April 13, 1922. Serial No. 552,080.

To all whom it may concern:

Be it known that I, GEORGE E. RIBLET, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a side elevation of the carburetor.

Fig. 2 a section on the line 22 in Fig. 1.

Fig. 3 a section on the line 3-3 in Fig. 1.

Fig. 4 a side elevation of the air valve.

Fig. 5 a side elevation of the air valve in a direction at right angles to that shown in Fig. 4.

Fig. 6 an outline view of an engine and carburetor attachment.

Fig. 7 a sectional view of an alternative structure.

Fig. 8 a side elevation of the air vali e in the alternative construction.

A marks the engine, B the manifold and C the intake leading from the carburetor to the manifold, the intake having a flange D to which the carburetor is attached.

1 marks the carburetor body. This is provided with a flange 1 for securing to the flange D. The body is provided with an annular air passage 2 leading from an air inlet passage 3, the passage 3 being controlled by a gate valve 4, the gate valve having an adjusting stem 5 extending through the walls of the passage and being provided with an adjusting nut 6. A spring 7 tends to hold the gate valve in adjusted open position.

The suction passage has the usual restriction 8 and terminates with a cylindrical portion 9 at its lower end. An air valve 10 is cylindrically shaped and moves axially into and out of the cylindrical portion 9. It is mounted in an opening 11 in axial alinement with the restriction. Valve operating stems 12 extend radially from the valve through cam openings 13 in the walls of the body. An operating rod 12 extends to the dash (not shown). The valve as shown in Fig. 2 is about mid-position.

A metering pin stem 14: has a passage 15 through it and is mounted in an opening 16 in the air valve. The passage 15 leads to an annular chamber 17 through radial openings 18. The metering pin 18 extends from the.

top of the stem to a point above the valve forming an annular nozzle slot 19, the inner wall of this slot formed by the metering pin extending above the outer wall. The opening 16 extending downwardly with a cylindrical wall fromthe slot 19. makes the taper of. the passage leading-to the slot very abrupt, the taper of the metering pin receding from the walls of the opening immediately below the slot. V

A sleeve 20 has an internal screw thread 21 which screws on to a screw thread 21 on the stem. This sleeve has external screw threads 22 which screw into the threads 23 in the body. A lever 2 1 is secured to the sleeve 20 and a rod 2 1 extends from. this to the dash (not shown). This gives to the metering pin the initial adjustment as desired. The external threads on the sleeve 20 should have a reverse pitch from those on the inside of the sleeve, that is to say, one should be right and the other left so that a double action is given to the stem with a given movement of the lever. A union member 25 is screwed on to the lower end of the stem. A second member of the union 26 cooperates with the member 25 securing the supply pipe 27 within the union and in communication with the passage 15. In order to give the metering pin its initial adjustment the union is loosened and the pin turned to the position desired. It is then looked in this position by a lock nut 28.

In order that the air delivered for idling may be more accurately controlled I prefer to incline the meeting faces of the restriction 8 and upper end of the valve. As shown these are inclined in both directions, in other words,, fluted. As the air valve moves downwardly from the cylindrical part 9 openings are formed at the lower part of the inclinations and these gradually widen and increase as the air valve is lowered. This permits of a very accurate adjustment of the air valve for idling. Further inasmuch as the movement of the air valve is accompanied by a corresponding movement of the metering pin this reduces the speed at which the air passage is opened relatively to the opening of the metering pin and this is desired in the idling condition. A stop screw 18 is provided operating at the end of of the cam slot 13 determining the point to which the air valve may beclosed for idling.

In the alternative construction I have prov1ded a movable restriction or venturi 30.-

This is screw-threadedinto-a ring 31 intheposite the metering pin there is a less pull on the gasoline than wherethe greater rest-r-iction-is intheopenin'g 33.

What I- claim: as-new is:-

1'-.o In a: carburetor, the combination of a body having asuotion passage; an a'irvalve in" war alinenient' with the passage; means for moving the airvalve axially to vary the air opening; a fuel passage-in the air'valve terminating in a nozzle; and a metering pin in the nozzle varying the-opening as the air valve moves, said metering pin extending through the valve-and. forming a fuel connection to the fuel passage.

2; In a carburetor, the combination of a body having a suction passage; an air valve in axial alinement. with the passage; means for moving the air valve axially to vary the air opening; a fuelpassage in the air valve terminating in a nozzle; a metering pin in the nozzle varying the opening as theair valve moves; and means for adjusting the metering pin' comprisinga' sleeve externally screw-threaded and screwed into the body and internally screw-threaded and screwed on to the pin.

In testimony whereof I have hereunto set my hand.

GEORGE E. RI BLET.

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