US2827929A

US2827929A - Gas nozzle

Info

Publication number: US2827929A
Application number: US622633A
Authority: US
Inventors: Lourdes V Mccarty
Original assignee: Controls Company of America
Current assignee: Controls Company of America
Priority date: 1956-11-16
Filing date: 1956-11-16
Publication date: 1958-03-25
Anticipated expiration: 1975-03-25

Description

March 25, 1958 L. V..MCCARTY 2,827,929

- GAS NOZZLE 2 Sheets-Sheet 1 Filed Nov. 16, 1956 INVENTOR. LouRoEs V. MFCARTY- A-r'roauev 2,827,929 I GAS NOZZLE Lourdes V. McCarty, Milwaukee, Wis., assignor to Controls Company of America, Chicago, Ill., a corporation of Delaware Application November 16, 1956, Serial No. 622,633 11 Claims. (Cl. 141-209) This invention relates to a fuel nozzle which shuts off automatically when the fuel level reaches the end of the nozzle and constitutes an improvement over the fueling nozzle shown in my application Serial Number 537,984.

The fuel nozzle shown in said application constitutes a marked improvement over the prior art in that it performs well over a much wider range of pressures and flow rates than the prior art structures. However, it is possible to open the valve to allow a moderate flow (one half gallon a minute or less) and still not have enough gasoline pass through the aspirator to operate the valve tripping latch mechanism. While this flow rate is quite small, it is desirable to improve upon the valve to make the aspirator latch mechanism operative at substantially all flow rates obtainable with the valve. In carrying out this objective the low flow rate is increased slightly (to, say, of a gallon a minute at 15 p. s. i.) but this rate is low enough to permit filling in increments of less than one quarter cup.

The principal object of this invention, therefore, is to improve upon my prior structure to insure operation of the aspirator latch mechanism in substantially all flow conditions.

In order to achieve the purposes of this invention I have provided a resilient connection between the valve actuating handle and the valve so the valve will be popped open to a position insuring adequate flow to the aspirator to operate the latch mechanism.

Other objects and advantages will be pointed out in, or be apparent from, the specification and claims, as will obvious modifications of the single embodiment shown in the drawings in which:

Figure 1 is a vertical sectionthrough the nozzle showing the valve closed;

Figure 2 is a section taken on line 22. in Figure 1 to show the details of the venturi in the low flow path;

Figure 3 is a section taken on line 3-3 of Figure 1;

Figure 4 is a view similarto Figure 1, but shows the valve open in solid lines and in dotted lines shows the tripped position of the lever and the valve; and

Figure 5 is a detail of the valve in its low flow position.

Referring to the drawings in detail, the fuel nozzle has a body provided with an inlet 12 threaded at 14 for connection to the hose leading from the fuel pump. Gasoline flowing through the inlet is regulated by valve assembly 16 which includes two valves serially arranged for actuation by stem 18 through the medium of stiff spring 19. Spring 19 is interposed between stem 18 and the valve assembly and is housed within hole 21 on the underside of the valve assembly. The rate of the spring is in the order of 400 pounds per inch and it is the presence of this spring which constitutes the improvement over my prior disclosure. The manner in which this spring improves the operation of my prior valve will be explained more fully hereinaften' The first of the two serially ar ranged valves comprises a neoprene disc valve mounted on stem 18 and cooperating with seat 22 pressed in the valve body.. This valve regulates the flow to the annular space between seat 20 and cylindrical sleeve 24. When the valve is raised only slightly, as in Figure 5, the cylindrical portion 28 of valve 26, also actuated by stem 18 acts to prevent flow centrally of sleeve 24. Of course,

2,827,929 Patented Mar. 25, 1958 when stem 18 is moved upwardly further, the conical portion of valve 26 comes into operation and permits a gradual increase in the rate of flow past valve 26.

Whenever valve 20 is raised from seat 22, there will be flow into annular space 30 between the sleeve 24 and seat 22. The gasoline flows from space 30 through conduit 32 into cross conduit 34 in plug 36 pressed into the body 10. The plug 36 is also provided with a small axial bore 33 through which the gasoline flows into the large bore chamber '40 and conduit 42. As the gasoline flows from the small bore 38 into the large areas 40 and 42, the gasoline tends to spray outwardly, and it is desired to have the liquidcornpletely fill conduit 42 in order to insure a reduced pressure in the chamber 40 by venturi action; In order to'insure this fanning out of the stream coming from the small bore 38 at all flow rates and at all pressures, the wire or spring 44 is bent as shown to provide'an end projecting into conduit 42 to break up any solid stream coming from the small bore 38. This very effectively insures filling the bore 42 with liquid to prevent loss of the desired venturi effect. The reduced pressure in chamber 40 acts through the lateral bore 46 to communicate 'with aspirator chamber 48 on the righthand side of diaphragm 50. The aspirator chamber 48 is vented through conduit 52 which runs down the center of the nozzle spout and terminates in fitting 54 mounted adjacent the end of the spout and including a vent 56. As soon as the liquid level in the container being filled rises to the level of vent 56, the breathing of the aspirator chamber 48 is blocked and the reduced pressure in chamber 40 becomes effective to act on diaphragm 50 to pull the diaphragm 50 to the right in opposition to the bias of spring 58.

The low rate liquid flow which is employed to obtain the venturi action at chamber 40 flows from conduit 42 into passage 60 which communicates with the interior of the spout on the downstream side of the valves. When the valve stem 18is raised to open the conical valve 26, the flow through the venturi section and out passage 60 continues so the venturi effect is operative at all times.

a The valves are operated by raising handle 62 about its pivot 64. t It will be noted that stem 18 passes through aperture 66 in the handle to rest on lever 68, the righthand end of which is pivotally connected to the handle at 70 and the left-hand end of which is provided with a roller 72 rotatably mounted on pin 74 and normally resting on ledge '76 formed by the lower ends of the two similar arms 78, forming the rocker arm 82. Thus, the lower ends of

arms

78, 80 are connected by the nut and bolt 84 and are pivotally connected to the body 10 by

pins

86, 86. At the upper end of the lever 82 the arms 78, 8t) areinterconnected by a plate 88 which is connected to diaphragm pin 90. This pin is connected to the diaphragm 50 through the medium of the

usual plates

92, 94.

As previously noted, spring 58 acts on diaphragm 50 to hold the diaphragm in the position shown in Fig. 1. Under this condition, rocker 82 is urged by the diaphragm spring 58 in a clockwise direction about its pivot 86. This holds ledge 76 under roller 72 so that when handle 62 is raised lever 68 will also be raised to lift valve stem 18 and open valve Zilalone or in combination with the conical valve 26. Now then, handle 62 can be held open manually or could be propped in the open position while the gasoline fills the container into which it is being dispensed. When the gasoline level reaches aspirator vent 56 in the tip of the nozzle, the vent becomes plugged and the low pressure. in venturi chamber 40 becomes effective to reduce the pressure on the right-hand side of dia phragm' 50 whereupon atmospheric pressure acting on the left-hand side of the diaphragm will move the diaphragm to the right against the bias of spring 58. When this happens, rocker 82 is rotated in a counter-clockwise direction about its pivot 86 and ledge 76 is withdrawn from its position under roller 72, leaving the left-hand end of lever 68 Withoutsu-pport. When this occurs, spring 96, acting on the valves in the seating direction, will act to close the valves while lever 68 drops to the position shown in Fig. 4 in dotted lines. It will be noted that the valves close even though the handle is held in the full open position. It will be appreciated that the release of lever 68 is quite smooth and calls for very little eifort since there is a rolling connection between lever 68 and rocker 82.

After the valves have been closed as shown in dotted lines in Figure 4, the mechanism may be reset by releasing handle 62 for movement back to the position shown in Figure 1 under the influence of spring 98 compressed between the nozzle body and handle 62. As the handle moves downwardly to the position shown in solid lines in Figure 1, the left-hand end of the released lever 68 will be forced to move upwardly by contact of the lever with pin 100. Thus, as the right-hand end of lever 68 is lowered, the lever 68 must rock about pin 100. Since the valve has closed, there is no pressure acting on the diaphragm and rocker 82 has returned to its normal position. Therefore, the elevation of the left-end of lever 68 permits the rocker to return to its normal position with ledge 76 under the roller. On the way up the roller cams the rocker out of its path.

Without spring 19 interposed between the stem and.

the valve assembly 16 the valve handle could be operated to open the valve only a very small amount (.001 inch to .005 inch) to allow such a moderate flow that there was insufiicient action at the aspirator to operate the tripping mechanism. With spring 19 interposed between the handle and the valve, actuation or lifting of the valve handle will compress spring 19 until the force stored in the spring-is great enough to lift the valve against the opposing forces ofvalve closing spring 96 and the pressure of the gasoline on the valve. With the spring rate of spring 19 in the order of 400 pounds per inch the amount the valve pops open is about .005 to .01 inch. This allows full flow through the aspirator, but does not permit any ,flow past valve 26. As a result, the minimumfiow is about /3. of a gallon per minute at 15 p. s. i. and this is slow enough to fill .in increments of less than A cup; It will be understood that when the valve assembly 16 is closed, the pressure is exerted across the area of the seat but When the valve is cracked open some of the pressure is on the underside of the valve. This has the effect of decreasing the resultant area of the valve and therefor theclosing forceon the valve. The net result is to cause the valve to pop open or snap open an amount determinedby the-rate of spring 19 and the decrease in effective area of the valve. Actually, with the. spring 19 interposed-between the stem and the valve assembly, there is still approximately .005 inch travel of the valve handle possible where-the flowrate is insufficient to actuate the aspirator. It will be appreciated that this is an extremely small range of movement of the handle and that such a range of operation without the aspirator latch mechanism being operative is of little concern. When closing the present valve there is no range in which the flow through the aspirator can be so low as to not operate the latch mechanism. 7 It will be seen, therefore, that the present fueling nozzle can, for all practical purposes, be considered fully automatic at all flow rates obtainable with the fuel nozzle.

Although but one embodiment of the present invention has been illustrated and described, it will be apparent to thoseskilled in the art that various changes and modifications may be made therein'without departing from the spirit of the invention or from thescope of the appended claims.

I claim:

1. In a fuel nozzle of thetype having abody provided with an inlet and anoutlet with a valve regulating flow therebetween, and a passage including a venturi for developing reduced pressure for operating an aspirator-operated trip-latchmechanism, the passage originating upstream of said valve, the combination of a second valve for regulating flow to the passage, means for. operating the second valve, and means operatively interposed 'between the operating means and the second valve for insuring adequate. opening of the second valve to obtain sufficient flow through the venturi to operate the aspirator.

2., A fuel nozzle according to claim 1 in which the first means includes a manually operated-lever and the second means is operatively interposed between the leverand the second valve,

3. .A fuel nozzle according, to claim2 in which the second-means comprises means for obtaining a snap. action of the second .valve between closed position anda position securing the flow rate necessary through the venturi to operate the, aspirator.

4. Afuel nozzle according to claim'3 in which the sec} ond means, comprises a spring interposed between the leverand the second valve. r 5. A fuelnozzle according to claim 4 in which the valves are serially operated by said lever, the second valve opening first to establish the low flow rate. V 6. A fuel nozzle comprising, a body having an inlet and an outlet having a main passage and an auxiliary passage therebetween, a valve for each passage and controlled by acommon stem, manaully operable means for controlling the valve stem movement, the valves being mounted for sequential operation with the valve regulating flow through the auxiliary passage being opened first, venturi means in said auxiliary passage to develop a reduced pressure at the throat of the venturi means, aspirator means adapted to be actuated by the reduced pressure and including a vent to cancel the effect. of the reduced pressure, means connecting said aspirator means to the manual means and operative to render the manual means ineffective when the vent is closed, and means operatively interposed between the-manual means and the auxiliary valve to impart a snap opening action to the auxiliary valve so the minimum opening thereof passes enough fuel to insure obtaining the reduced pressure at the venturi necessary to operate the aspirator. r

7. A fuel nozzle according to claim 6 inwhich the snap action means: comprises a spring, said main valve being closed when the auxiliary valve is in .its minimumflow position. f n

.8. Aniautomaticshut-off fuel nozzle having a body provided .with an inlet and an outlet with a valve regulating flow therebetween, a venturi in the body having the flow therethrough regulated by the valve, said venturi being employed to develop a reduced pressure for operating anaspirator-operated trip-latch mechanism, means for operating the valve, and means'operatively interposed between theoperating means and the valve for insuring opening the valve sufficiently to obtain the minimum flow through the venturi required to develop the operating pressure reduction. 0

9. AT. nozzle according to claim 8 in which the first means is-a lever and the second'means is operatively interposed between the lever'andthe valve.

10. A nozzle according to claim 9 in which the'second means is a snap .operatingmechanism for snapping the valve ..to.the minimum fiow position when the lever is actuatedto open the valve.

11. AInozzle according to claim 10 in which the snap mechanismflcomprises 'a spring transmitting movement from the lever tothe valve.

1 References Cited in the file of this patent V V UNITED STATES PATENTS 2,582,195 nue'r'r Jams, 1952- -2,675,952 Shatter et a1. Apr.'20, 1954 UNITED STATES PATENT ()FFICE CERTIFICATE OF CORRECTIQN Patent No. 2,827,929 Lourdes V. McCarty March 25, 1958 'rected below;

In the grant, line 2, address of assignee, for "Chicago, Illinois" read Schiller Park, Illinois in the heading to the printed specification,- line 4, address of assignee, for "Chicago, Ill." read Schiller Park, Il a "7 Signed and sealed this 17th day of June 1958.

(SEAL) Atfiest:

KARL H. AXLINE Attesting Officer ROBERT c. wATsoN Comissioner of Patent: