US1748677A - Carburetor - Google Patents

Description

Patented Feb. 25,` `191:0

' UNITED STATE-s LEOPOLDPODSZUS, OF BERLIN-CARLOTTENBURG, GERMANY Application led August 1, 1927, Serial No.

My invention relates to carburetors, more particularly of the type in'which a fuel valve is lifted by means of a Suction controlled piston andthe stroke of the piston is limited by a check under the control of the air-inlet valve.

It is an object of my invention to'enable the valve to be opened under no-load conditions.

',Io this end I provide means for adjusting the check so as to enable the fuel valve to perform a corresponding lift.

.In the drawing accompanying this application a carburetor embodying my invention is illustrated diagrammatically by way of example.

In the drawing Fig. lis an elevation, l

Fig. 2 is an end elevation of the carburetor I Vviewed from the right in Fig. 1, its attaching ange being partly broken away,

Fig. 3 is a section on the line IIL-:III in Fig. 2, and

Fig. 4 is a section on the line IV-IV in4 Fig. 3.

Referring now to the drawing, a is the casing of the carburetor and a is aflange by which the carburetor is attached to the manifold of the engine, not shown, c is the casing of the fuel supply valve fn, to one side of the casing a, nipple on the fuel valve casing c to which the fuel supply pipe, not shown, is connected, h is a perforated plug which is arranged on V ing (L and jis adapted to slide in a cap f p Y which is screwed on the casing a an equipped with a slotted guide w fora pin 'w which pro'ects from one side of the valve The valve ii bored axially and adapted to slide on the choke tube b, a Bowden .cable g which is secured` c 1s a threaded one side ofthe casing c below the seat of thev 209,803, and in Germany August s1, 192s.

being secured to a tubular projection in the extension ofthe axial bore. z" is a tubular boss projecting on the-inside of the cap f', and i is a spring'inserted between the valve f and the bottom of the cap f. I

d is a tapered lining in the casing a which partly surrounds the end of the choke-tube b', m is an annular groove in the periphery of the lining, and c are slots connecting the inner face of thellining with'the groove m. 60 The inside diameter of the liningis selected in proportion to the power ofthe engine.

A cavity u is formed in the casing c below the fuel valve n, u is a cylindrical block which may be displaced in thecavity, 'v is a 65 set screw by which the block is held in position, t is a pin 1n the block, and o is a blade which is pivoted on t. p is a stepped piston arranged in a second cavity of the casing v below that in which the blade o is arranged, r is a perforated cap by which the chamber of the piston is closed, and q is a passage connecting the groove m in the lining l and the chamberof the piston p. The rod of the piston bears on-the blade o from below.

.e is an adjustable screw in a double-armed lever s which is fulcrumed onl the cap' f at y. is a cani which is fulcrumed in the lever s at m', and m2 is a screw which is inserted in an eye.l of the lever s and engages a slot at the end of the cam so that the relative position of the cam and the levers is varied by turning4 the screw m2. s is a spring which is secured on the casing c and tends to hold the lever s against the pin fwl of the air inlet valve f which may be flattened where 1t 1s engaged by the cam.

The suction of the engine tendsto raise the piston p and, through the medium of the blade o, to open the fuel valve n. The leverage intermediate the piston .p and the valve n 'is varied by displacing the block u, in its cavity. The obj ect of this arrangement is to enable the proper leverage between these u. By moving the block u to ing the block inthe dlrection of the the right, that is,

-flange a', the leveragein favor of the piston p is reduced, and, by moving the block u to the left, it is increased.

arts to be found by-experiinentally displac- 9i` i i tapered lining d.

The screw e and'the parts connected with it, serve for placing the operation of the piston p and the valve n under the controlof the air inlet valve f. It will be understood that the screw .e in the end of the lever s is reciprocated vertically when the valve f is displaced, and that the amountof such reciprocation is regulated by adjusting the position of the cam with respect to its lever s. The upward motion of the blade o is limited by the screw z. If it is desired to use the carburetor under no-load conditions, the screw e is so adjusted in its lever s that its end is beyond reach of the blade o so that the piston p is able to effect a small lift of the valve n.

I wish it to be understood that I do not desire to be limited to the vexact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim:

1. A carburetor comprising a casing, a fue] valve and an air inlet valve in said casing, a lever fulcrumed on said casing at one end and operatively connected with said fuel valve, means for displacing the fulcrum of said lever, suction-controlled means inde-4 pendent of said air inlet valve operatively .connected with said lever, the point at which said fuel valve is engaged by said lever being nearer to its fulcrum than the point where said lever is engaged by said suction controlled-means. and an operatively connected with said air inlet valve and adapted tov check the movement of said lever.

2. A carburetor comprising a casing, a fuel valve and an air inlet valve in said casing, a lever fulcrumed on said casing at one end and operatively connected with said fuel valve, means for displacing the fulcrum of said lever, suction-controlled means independent of said air inlet valve operatively connected with said lever, the point at which said fuel valve is engaged by said lever being nearer to its fulcrum than the point where said lever is engaged by said suction-controlled means, a pin operatively connected with said air inlet valve so as to move in unison therewith, a double-armed lever fulcrumed on said carburetor and adapted to be engaged by said pin, and an adjustable stop on said-doubleying facing adjustable stop armed lever adapted to check the movement of said first mentioned lever. y

3. A carburetor comprising a casing, a fuel valve and an air inlet valve 1n said casing, a lever fulcrumed on said casing at one end and operatively connected with said fuel valve, means for displacing' the fulcrum ofsaid lever, suction-controlled means independent of said air inlet valve operatively connected with said lever, the point at which said fuel valve is engaged by said lever being nearer to its fulcrum than the point where said lever is engaged by said suction controlled means, a pin operatively connected with said air inlet valve so as to move in unison therewith, a double-armed lever fulcrumed on said carburetor. a cam on said double-armed lever adapted t'o-be engaged by said pin, means for varying the position of said cam with respect to said double-armed lever, and an adjustable stop on said doublearmed lever adapted to-check the movement of said first mentioned lever.

4. A carburetor comprising a casing, a fuel valve and an air inlet valve in said casing, a lever fulcrumed on said casing at one-end and operatively connected with said fuel valve, means for displacing the fulcrum of said lever, suction-controlled' fmeans independent of said air inlet valve operatively connected with said lever, and a tapered linthe engine end of said carburetor and defining an annular space with the wall of said carburetor, said carburetor having a passage connecting said space with said suction-controlled means. y

5. A carburetor comprising a casing, a fuel valve and an air-inlet-valve in said casing, a lever fulcrumed on said .casing at one end, means connected with said fuel valve for holding said valve engaged with one side of the lever, suction-controlled means independent of said air-inlet-valve, means operatively connected with said suction-controlled means and engaging the-opposite side ofthe lever, and a check operatively connected with said air-inlet-valve so that its position with respect to said lever is varied in conformity with the position of said air-inlet-valve, said check being adapted to engage the vsame side of the lever as said means connected with said fuel valve.

In testimony whereof I aiix my signature.

LEOPOLD PODSZU S.

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