US2553888A - Check valve for gasoline dispensing nozzles - Google Patents

Description

May 22; 1951 c. M. BARNES CHECK VALVE FOR GASOLINE DISPENSING NOZZLES Filed March 26, 1949 Char/es M. Barnes Patented May 22, 18951 UNITED STATES, PATENT OFFICE/ CHECK VALVE FOR'GASOLINE DISPENSING NozzpEs Charles lVI Barne s, Childress, Tex.

Application March 26, 1949, Serial No. 83,578

1 Claim.

This invention relates to nozzle valves for gasoline dispensing pumps and it has particular reference to a check valve auxiliary to the self closing nozzle valve of a gasoline pump dispensing hose.

The principal object of the invention is to provide a simple medium through which is obviated the failure of the conventional nozzle valve to evacuate all gasoline from the tube following each operation. Retention of some two or three ounces of gasoline in the valve body presents a hazard since this residue gasoline may be emptied by gravity simply by inverting the nozzle and such retention is in violation of the laws of most States governing such cases. To prohibit entrapment of gasoline in the valve body, the present invention incorporates a check valve in the small tube of the valve body through which gasoline flows from the hose in its passage to discharge when the main valve is opened. The check valve opens under pressure of the gasoline and closes under spring pressure when the gasoline flow is interrupted by the closing of the main valve and thus reduces to a minimum the capacity of the small I tube in which the residue gasoline is ordinarily the invention has further reference to certain features of accomplishment which will become apparent as the description proceeds, taken in connection with the accompanying drawings wherein:

Figure 1 is a side elevational view, partly in section, showing the invention installed in the small tube of a conventional nozzle valve.

Figure 2 is a fragmentary sectional view on a slightly larger scale, and

Figure 3 is a transverse sectional view taken on line 3-3 of Figure 2.

Continuing with a more detailed description of the drawing, reference numeral denotes generally the body of the conventional nozzle valve on which is formed an angular branch I l adapted to receive a curved tube I2 through which gasoline is passed into the fuel tank of an automobile. A diaphragm housing I3 is attached to the valve body and contains mechanism for auto-matically shutting off the fiow of gasoline after the tank becomes full. That portion [4 of the valve body IIJ constitutes a casing for the main valve and attendant mechanism which is actuated by the valve operating lever l5 to open the body to the passage of gasoline from the hose, not shown, through the small tube It and to discharge through the tube I2.

The flexible hose through which the gasoline flows from the pump to the nozzle is attached to the small tube I6 by means of the flanged nipple I1. In conventional practice, a form of check valve is installed in the end of the small tube [6 to which is attached the hose but this valve does not prevent entrapment of gasoline in the small tube, which has the capacity of approximately three ounces of gasoline.

The present invention consists of a sleeve H! which is exteriorly tapered to correspond to the slightly tapered bore of the small tube [6 of the valve body. This sleeve has a concentric guide l9 therein retained by lateral webs 20 and through which extends the stem 2| of a valve 22. The valve 22 is disposed on a seat 23, defined by an annular recess 24 in which is retained a packing ring 25 of rubber or like material capable of resisting the deteriorating efiects of gasoline. A compression spring 26 surrounds the stem 2| and bears at one end against the guide [9 within the sleeve l8 while the other end is retained by a ring 21, mounted on the stem and held by a cotter key 28.

The above described assembly is inserted into the open end of the bore of the small tube 16 and is thrust towards the opposite end by a coil spring 29 which is interposed between the sleeve and the threaded nipple H. The sleeve I8 is of such diameter that it may be advanced in the tube bore to a point in near contiguity with the valve mechanism operating in the portion Id of the body ill but with sufiicient intervening space to enable the valve 22 to fully open under pressure of gasoline flowing through the tube It but against the resistance of spring 26 whose function is to close the valve 22 when the main valve closes.

It has been stated that in conventional practice the small tube It actually constitutes a. chamber in which a quantity of gasoline is entrapped and which creates an objectionable condition if not actually a hazard. It is clearly apparent from the foregoing that the invention reduces to a negligible degree the space in the small tube "3 Which can be occupied by gasoline finding release from the nozzle after the same has been withdrawn from the full tank of an automobile or following operation of the main valve.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended claim is also considered to be within the spirit and intent of the invention.

What is claimed is:

In a gasoline dispensing nozzle, the combination comprising a body having a gasoline inlet tube provided with a tapered bore, an integral and right angular valve casing on the forward end of said inlet tube, a valve in said casing, a gasoline delivery tube connected to and in communication with said casing, an exteriorly tapered sleeve disposed in the bore of said inlet tube in juxtaposition to said casing and held against displacement in the direction of said casing by the taper of said bore, a flanged nipple threaded into the end of said inlet tube opposite said casing, a coil spring disposed in said tapered bore between said nipple and said sleeve, a valve 15 1 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,722,985 Kling Jul 30, 1929 Logan Aug. 9, 1932

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