US4025588A — Carburetors utilizing an acceleration pump and a …

Claim 1

Independent Claim 104 words

In a carburetor having an acceleration pump, acting in conjunction with the throttle valve of the carburetor, for injecting fuel into the fuel-air mixture chamber of the carburetor through an injection channel containing an injection restrictor in the opening of the injection channel into the fuel-air mixture chamber, the improvement comprising: a fuel accumulator containing a diaphragm under bias forming a diaphragm chamber in the accumulator, a branch channel interconnecting said diaphragm chamber to said injection channel between said acceleration pump and said injection restrictor, and a connection channel between said diaphragm chamber and a fuel supply, said connection channel including a check valve.

Claim 2

Dependent Claim 104 words

In a carburetor having an acceleration pump, acting in conjunction with the throttle valve of the carburetor, for injecting fuel into the fuel-air mixture chamber of the carburetor through an injection channel containing an injection restrictor in the opening of the injection channel into the fuel-air mixture chamber, the improvement comprising: a fuel accumulator containing a diaphragm under bias forming a diaphragm chamber in the accumulator, a branch channel interconnecting said diaphragm chamber to said injection channel between said acceleration pump and said injection restrictor, and a connection channel between said diaphragm chamber and a fuel supply, said connection channel including a check valve.

Claim 3

Dependent Claim 18 words

The carburetor improvement of claim 1 also including a restrictor in said branch channel proximate said diaphragm chamber.

Claim 4

Dependent Claim 16 words

The carburetor improvement of claim 1 also including means for adjusting the bias on said diaphragm.

Claim 5

Dependent Claim 17 words

The carburetor improvement of claim 1 also including means for defining the maximum deformation of said diaphragm.

Claim 6

Dependent Claim 68 words

The carburetor improvement of claim 1 wherein the carburetor is in the fuel system of an engine, the fuel system having a suction pipe, said diaphragm also forms a pressure chamber on the side of said diaphragm opposite said diaphragm chamber and said pressure chamber of said accumulator communicates with the outer air or the negative pressure of the suction pipe in the fuel system of the engine.

Claim 7

Dependent Claim 150 words

In a carburetor having an acceleration pump, acting in conjunction with the throttle valve of the carburetor, for injecting fuel into the fuel-air mixture chamber of the carburetor through an injection channel containing an injection restrictor in the opening of the injection channel into the fuel-air mixture chamber, the improvement comprising: a fuel accumulator containing a diaphragm forming a diaphragm chamber in the accumulator, a branch channel interconnecting said diaphragm chamber to said injection channel between said acceleration pump and said injection restrictor, a restrictor in said branch channel proximate said diaphragm chamber, means for biasing said diaphragm toward a predetermined volume of said diaphragm chamber, means for adjusting said biasing means, means for defining the maximum deformation of said diaphragm, and thereby the maximum increased volume of said diaphragm chamber, and a connection channel between said diaphragm chamber and a fuel supply, said connection channel including a check valve.

Claim 8

Dependent Claim 150 words

In a carburetor having an acceleration pump, acting in conjunction with the throttle valve of the carburetor, for injecting fuel into the fuel-air mixture chamber of the carburetor through an injection channel containing an injection restrictor in the opening of the injection channel into the fuel-air mixture chamber, the improvement comprising: a fuel accumulator containing a diaphragm forming a diaphragm chamber in the accumulator, a branch channel interconnecting said diaphragm chamber to said injection channel between said acceleration pump and said injection restrictor, a restrictor in said branch channel proximate said diaphragm chamber, means for biasing said diaphragm toward a predetermined volume of said diaphragm chamber, means for adjusting said biasing means, means for defining the maximum deformation of said diaphragm, and thereby the maximum increased volume of said diaphragm chamber, and a connection channel between said diaphragm chamber and a fuel supply, said connection channel including a check valve.

Claim 9

Dependent Claim 60 words

The carburetor improvement of claim 6 also including a check valve in said injection channel between said branch channel and said injection restrictor, and wherein said acceleration pump includes a fuel supply check valve and wherein said injection channel check valve is oriented to be closed when said fuel supply check valve and said connection channel check valve are open.

Claim 10

Dependent Claim 34 words

The carburetor improvement of claim 6 wherein said biasing means is a spring and wherein said adjusting means includes means threaded in the wall of said accumulator for varying the compression of said spring.

Claim 11

Dependent Claim 37 words

The carburetor improvement of claim 8 wherein said adjusting means includes a shoulder on the inner end thereof, and wherein said spring is positioned between said shoulder and said diaphragm and encloses a portion of said screw.

Claim 12

Dependent Claim 32 words

The carburetor improvement of claim 6 wherein said defining means includes a screw adjustable as to length with respect to said diaphragm, said diaphragm abutting against said screw at the maximum deformation.

Claim 13

Dependent Claim 32 words

The carburetor improvement of claim 10 wherein said adjusting means includes means for supporting said screw, and wherein the length of said screw is adjustable as to length through said adjusting means.

Claim 14

Dependent Claim 43 words

The carburetor improvement of claim 10 also including a piston in said diaphragm chamber and means for mounting said piston on said diaphragm and wherein the abutment of said screw with a portion of said piston-mounting means limits the deformation of said diaphragm.

Claim 15

Dependent Claim 152 words

In a carburetor having a pump acting in conjunction with the throttle valve for injecting fuel into a fuel-air mixture chamber during acceleration, a method for controlling the amount of fuel injected during acceleration, comprising the steps of: providing a fuel accumulation chamber in communication with the pump having a predetermined volume and a variable increased volume against a bias pressure; filling said predetermined volume of said fuel accumulation chamber with fuel under the suction action of the pump; increasing said volume against said bias pressure by diverting a portion of the fuel supplied by said acceleration pump during acceleration; storing said diverted portion of fuel in the increased volume under said bias pressure; and automatically injecting fuel into the fuel-air mixture chamber from said fuel accumulation chamber by the return of said increased volume to said predetermined volume under said bias pressure when said pressure exceeds the force of said pump.

Claim 16

Dependent Claim 152 words

In a carburetor having a pump acting in conjunction with the throttle valve for injecting fuel into a fuel-air mixture chamber during acceleration, a method for controlling the amount of fuel injected during acceleration, comprising the steps of: providing a fuel accumulation chamber in communication with the pump having a predetermined volume and a variable increased volume against a bias pressure; filling said predetermined volume of said fuel accumulation chamber with fuel under the suction action of the pump; increasing said volume against said bias pressure by diverting a portion of the fuel supplied by said acceleration pump during acceleration; storing said diverted portion of fuel in the increased volume under said bias pressure; and automatically injecting fuel into the fuel-air mixture chamber from said fuel accumulation chamber by the return of said increased volume to said predetermined volume under said bias pressure when said pressure exceeds the force of said pump.

Claim 17

Dependent Claim 18 words

The method of claim 13 also including the step of limiting the amount of increase of said volume.

Claim 18

Dependent Claim 13 words

The method of claim 12 including the step of adjusting said bias pressure.

Claim 19

Dependent Claim 18 words

The method of claim 13 including the step of controlling the proportion of the amount of fuel diverted.

Claim 20

Dependent Claim 55 words

The method of claim 16 wherein the step of controlling the proportion of the amount of fuel diverted includes the step of restricting the area through which the fuel is injected into the fuel-air mixture chamber, restricting the area through which the diverted fuel enters the predetermined volume, and adjusting the force of said bias.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-05-23	1980-11-22	1981-05-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-05-23	1984-11-22	1985-05-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-05-23	1988-11-22	1989-05-24	$7700.00	Window Closed / Lapsed

Carburetors utilizing an acceleration pump and a method therefor

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