US1622513A - Carburetor - Google Patents

Description

1,622,513 March 29, 1927 i s. B, HOLMES CARBURETOR Filed April '9, 1.923

O INVENTOR .STANLEY E l-/o/nfa ATTORNZ'GK Patented Mar. 29, 1927.

UNITED STATES STANLEY '.B. HOLMES, OF SEATTLE, WASHINGTON.

eamiunafr'on.

Application ltiled April 9, 1923. Serial No. 630,785'.

This invention` relates to improvements in earburetors, and has for its princlpal object to provide a carburetor into which gasoline may be fed from a supply tank at a lower level by means of sub-atmospheric pressure.

AAnother object of the invention resides in the provision of means whereby the connection with the sub-atmospheric pressure is .0 automatically controlled to maintain the.

supply within the carburetor.

A further object is to provide a carburetor wherein there is an automatic re ulation of air admitted tothe mixing cham er in pro- .5 portion to the amount of gasoline consumed. Other objects reside in the provision of means for effectively vaporizing and mixingdthe fuel before it passes into the manifol :o In accomplishing these 'and other objects of the invention` I have provided the improved details of construction, the preferred forms of which are illustrated in theaccompanying drawings, wherein- Figure 1 is a side view of a carburetor constructed in accordance with the present invention. i

Figure 2 is an enlarged, sectional view of.

the same. Y.

Figure 3 is a detail, sectional 'view of the float actuated valve mechanism for controlling the vacuum pressure in the float chamber.

Referring more in detail to the several views of the drawings wherein like reference numerals designate the same, or like parts.

1 designates, as a whole, a carburetor constructed in accordance with the present invention, and comprising a vertical, tubular portion 2 provided with a flange 3 at its upper end through which bolts, as at 4, are extended to securek the device to the fuel intake manifold of an engine. Cast integrally with the tube, at one side and near .5 its lower end is a bowl forming a supply chamber 5, and fitted within the upper portion oit-this bowl is a cu which forms a float chamber 6 and over w ich a cover plate 7 is fitted and secured to the bowl by screws 8 to tightly close both against leakage. Extended forwardly from the base of iloat `chamber and threaded into a boss 9 in base of bowl 5 is a' tube 10 by which connection is made with a su ply tube 11 that may lead from a source o supply at a lower level than the carburetor. The tube has a laty eral extension 12 wherein is an upwardly directed opening 13` into the bowl; this opening being normally covered by a valve plate 14 mounted on guide pins 15 which will rise to permit a ow into the chamber 5, but

'ill automatically lclose to prevent any backow. i

The flowv of gasoline from conduit 11 is automatically controlled by the action of a float 16 located in chamber 6 and slidable on a valve pin 17 extended centrally therethrough and downwardly through tube 10 ;l it being provided with a tapered lower end 18 adapted to a tapered valve seat 19. The

top of the fioat is engaged by the outer ends of weighted levers` 2O supported pivotally, as at 21, from the cover 7 and having operative connection at their inner ends with the pin 17 in such manner that lowering of the float will raise the pin to permit an inflow of gasoline, and rising of the fioat will move the pin toward closed position to cut oit the inflow.

Thetube 2 is open at its lower ends to provide an air intake passage 24 directly into the manifold, and fitted within this passage in spaced relation are rings 25 and 26 each tapered from its opposite sides to the central passage so as-to form Venturi, tubes, and beneath these are valves 27 and 28 of the butterfly type operable respectively by meansoutlets 37 lead into the Venturi opening' just above its most restricted part.

Likewise, in the ring 26 upper and lower annular passages 40 and 41 are formed from which outlets '42 and 43 lead .into the Venturi opening in alternating relation justabove the most restricted part of the passage. Passage 41 is connected by means of 'a passage 44 with thebottom of supply chamber 5, and passage 40 is fed by means of a passage-45 that opens into the base of the well 35. To permit a read, rise and fall of gasoline in chamber 5, an well 35, the former is provided through cover plate 7,

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fitted within the dome is a sleeve valve 52 that may be moved upwardly to close the end of pipe 50, or downwardly to cover an opening 53 to atmosphere in the opposite side of the dome and offset from the opening into pipe 50; the movement of the sleeve being limited by stops 54 and 55. The sleeve is actuated by connection with the pin 17, the connection comprising a pair of'levers 56 pivotally connected attheirinner ends with a plate 57 mounted between adjusting nuts 58 on the pin and with their outer ends extended between flanges 59 on the interior of the sleeve. A tensioned spring 60 connects the arms so as to throw them quickly in opposite directions when actuated fromv one side to the other. Withthe parts as shown in Figure 3, the float chamber is connected with the sub-atmospheric pressure in the manifold and gasoline may be drawn into the chamber, but when the chamberis lled, the float will rise and cause pin l? to be moved downwardly. rThis will cause the pivoted inner ends of levers 56 to be moved past the dead center line and spring 60 to snap them upwardly to throw the valve sleeve upwardly to close pipe 50 and uncover the opening 53, thereby shutting od `the sub-atmospheric lpressure and allowing air to enterthe chamber through port 53, so that the gasoline may flow out as needed through passage 13 into chamber 5.

With the parts so constructed and assembled, operation would be as' follows:

On starting the engine to vwhich the carburetor is attached, valve 28 would be closed while valve 27 is left open. Suction in the manifold then causes gasoline tov be drawn vinto the mixing passage 24 through passages ports 37 whereby it is finely vaporized and mixed withlair so that a very small amount of gasoline 1s necessary. l

While driving the vehicle, valve 27 is ncaacia opened and the speed controlled by its adjustinent between opened and closed positions. ][t will be seen that gas will be taken in through passages dit and d5, and since the hole 36 in bottom of well 35 is very small, the well will soon be emptied and then air will be admitted through the well vand/passage 45, and into the mixing tube suction manifold, a fioat chamber, a fuel storage chamber adapted to be lled through y a back check valve connection with the float chamber and having connection with a source of yfuel supply, a valve in said fuel supply connection, a float for controlling `said valve, a cylindrical dome opening into the top of the float chamber and having an opening in the side thereof to outside atmosphere, a suction conduit from the suction manifold opening into one side of the dome in odset relation above the opening to at mosphere, a sleeve slidably fitted in the dome and operable by the doat between positions to cover either the opening to atmosphere or the opening to the suction manifold.

2. lin a carburetor, in combination with a suction manifold, a Boat chamber, a Heat in the said chamber, a fuel storage chamber adapted to be filled through a back check valve connection with the float chamber and having connection with a source of fuel supply, a valve stemadapted to be actuated by the float to open or closed connection with said source of supply,y a cylindrical dome opening into the top of the float chamber and having an opening in the side thereof to outside atmosphere, a suction conduit from the suction manifold opening into one side of the dome in oiiset relation above the` opening to atmosphere and a sleeve slidably fitted in the dome and movable to separately Icover either the opening to atmosphere or to the suction manifold, stops in the dome for limiting the sleeve movement, yieldable trip members for shifting the sleeve from one position to another, and means connected with the valve pin for actuating the trip members.

Signed at Seattle, King County, Washington this 3rd day of April, 1923.

STANLEY B. HOLMES.

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