Dispensing nozzle improvement for extracting fuel

In a nozzle assembly for dispensing fuel from a source thereof into a container such as a fuel tank, the assembly having a body in which is defined a fuel flow passage, a spout attached to the body and in fluid communication therewith for directing fuel into the tank, a variable venturi capable of providing for the undivided and unified flow of fuel therethrough, said variable venturi interposed in the passage for producing a partial vacuum which is used to automatically shut-off fuel flow when the tank is full, and a vapor return path for capturing fuel vapors and returning them to the source, said vapor return path susceptible of inadvertently accumulating fuel at a low point, the improvement comprising, means for extracting fuel from the vapor return path, said means including means for generating a second vacuum at the variable venturi which is applied to the location of the vapor return path to draw any fuel out of the path, the assembly including an extraction means, one end of which is in fluid communication with the variable venturi and capable of conducting the second vacuum generated therein, the variable venturi having at least one port therein defining a vacuum generation area for generating the second vacuum therein, and the extraction means includes at least on passage extending through the venturi and opening to the vapor return path at the location of the fuel, there being at least one second port extending through the venturi and opening into another passage, said at least one second port allowing the partial vacuum created by the venturi to be communicated to that portion of the assembly controlling automatic fuel flow shut-off, and said variable venturi including means for isolating the produced partial vacuum and the second vacuum while allowing the undivided and unified flow of fuel therethrough for its dispensing into a fuel tank.

Means for generating a plurality of partial and isolated vacuums in the venturi of a nozzle assembly while maintaining an undivided and unified flow of a fuel through the nozzle venturi and for dispensing said fuel from a fuel source into a fuel tank, the nozzle assembly having a body in which is defined a fuel flow passage, a spout attached to the body in fluid communication therewith for directing fuel into the tank, said venturi locating at the spout-nozzle juncture, said nozzle incorporating means for automatically shutting-off fuel flow when the tank is full, and said nozzle incorporating a vapor return path for capturing fuel vapors and returning them to the source to reduce air pollution, said vapor return path susceptible of inadvertently accumulating fuel at a low point, said venturi of the nozzle assembly comprising a variable venturi also interposed in the fuel passage of the nozzle assembly, said variable venturi disposed for providing for the undivided and unified flow of fuel therethrough, structural means formed on the venturi for creating a first partial vacuum supplied to the automatic shutting-off means, and said structural means provided for creating a second partial vacuum applied to the vapor return path to draw fuel out of the said path, and there being means formed of the variable venturi to isolate the created first and second partial vacuums during the undivided passage of the flow of fuel through the nozzle body, its variable venturi, and for its dispensing from the spout.