GB1587257A - Liquid dispensing nozzle having a sealing arrangement for vapour return means - Google Patents

Description

(54) LIQUID DISPENSING NOZZLE HAVING A SEALING ARRANGEMENT FOR VAPOR RETURN MEANS (71) We, DOVER CORPORATION, a Corporation organised under the laws of the State of Delaware, United States of America, of 277 Park Avenue, New York, New York 10017, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to liquid dispensing nozzles.

When filling a vehicle tank with gasoline through a dispensing nozzle, vapors from the gasoline within the tank are prevented from escaping through the fill pipe opening in which the spout of the nozzle is inserted by sealing the fill pipe opening. Thus, the escape of gasoline vapors to the atmosphere is prevented so that pollution of the atmosphere is decreased.

The vapors within the tank can be recovered through vapor recovery equipment utilized in conjunction with the nozzle and connected thereto.

Our British patent No. 1449918 discloses a sealing arrangement between the fill pipe being filled and the vapor return or recovery passage of the nozzle. This sealing arrangement of the aforesaid patent also seals the vapor return or recovery passage when the tank is not being filled so that the vapor recovery equipment does not communicate with the atmosphere.

The present invention is an improvement of the aforesaid British patent in that there can be certain conditions in which sealing of the vapour recovery passage is not maintained when the spout is not disposed in the fill pipe.

This occurs when the sealing surface is disposed in so that the sealing surface, which cooperates with a conical surface on a retainer or stop on the spout, is disposed at an angle other than perpendicular to the longitudinal axis of the spout. This occurs because the sealing means having the sealing surface is capable of movement relative to the spout. While this amount of leakage is small, it is desired to be able to seal the vapour return or recovery passage whenever the spout is not disposed in the fill pipe.

Accordingly the present invention provides a liquid dispensing nozzle comprising a body; a spout extending from said body having its free end arranged for insertion in an opening of a fill pipe of a tank or the like; means to return vapour from the tank being filled to permanently remove the vapour from the tank to an area in which the vapour is collected for recovery; said vapour return means having no communication with said spout except through the tank being filled; first sealing means to form a seal between the fill pipe opening and said vapour return means when said spout is dis- posed in the fill pipe; second sealing means separate from said first sealing means, to seal said vapour return means when said spout is not disposed in the fill pipe to prevent vapour from entering the atmosphere through said vapour return means from the area in which it is collected, said second sealing means being disposed within said vapour return means in spaced relation to said first sealing means, and means responsive to said first sealing means being in its sealing position to cause said second sealing means to cease to be in its sealing position only after said first sealing means is in its sealing position.

The invention may be carried into practice in various ways but two specific embodiments thereof will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a sectional view, partly in elevation, of liquid dispensing nozzle embodying the invention, having one form of the sealing arrangement, the sealing arrangement being shown in its closed position.

Figure 2 is a fragmentary sectional view, partly in elevation, of the nozzle of Figure 1 with the spout of the nozzle disposed in the fill pipe of a vehicle tank to be filled and the sealing arrangement in its open position.

Figure 3 is a fragmentary perspective view of a portion of the nozzle of Figure 1.

Figure 4 is a plan view of the support plate of the sealing means.

Figure 5 is a fragmentary sectional view of the nozzle taken along line 5-5 of Figure 1 and showing the connection of the relatively soft seal to the end of the bellows.

Figure 6 is a cross sectional view of the nozzle taken along line 6-6 of Figure 1 and showing the connection of the spring retainer to the end of the bellows.

Figure 7 is a cross sectional view of the nozzle of Figure 1 taken along line 7-7 of Figure 1 and showing the connection of one end of the spring to the spring retainer.

Figure 8 is a plan view of one of the latch rings for retaining the spout of the nozzle within the fill pipe.

Figure 9 is a fragmentary sectional view, partly in elevation, of another embodiments of the present invention with the sealing arrangement in its closed position.

Figure 10 is a fragmentary sectional view, partly in elevation, of the nozzle of Figure 9 with the spout of the nozzle disposed in the fill pipe of a vehicle tank to be filled and the sealing arrangement in its open position.

Referring to the drawings and particularly in Figure 1, there is shown a liquid dispensing nozzle including a nozzle body 10. The nozzle body 10 has an inlet 11 to which a hose is connected to supply liquid such as gasoline, for example, to the interior of the body 10. The body 10 has an outlet 14 with which a spout 1 5 communicates to receive liquid from the interior of the body 10.

The spout 15, which is adapted to be inserted within an opening 16 (see Figure 2) in a fill pipe 17 of a vehicle tank such as an automobile fuel tank, for example, has an end threaded in a spout adapter 18, which is connected to the outlet 14 of the body 10 by a screw 19. The screw 19 is preferably formed of a material that will break or shear when subjected to a predetermined force. Thus, if the spout 15 should be retained in a vehicle tank when the vehicle is moved, the screw 19 breaks and allows the spout adapter 18 to be pulled from the body 10 without any damage to the body 10 or to the pump to which the body 10 is connected by the inlet hose.

The body 10 has a first or main poppet valve 20, which is controlled by a manually operated lever or handle 21, and a second poppet valve 22 therein. The valves 20 and 22 control the flow to the spout 15 in the manner more particularly shown and described in U.S. patent 3, 823, 752 to Lasater et al.

The outlet 14 of the body 10 has one end of a bellows 23, which is preferably formed of a gasoline resistant synthetic rubber, for example, secured thereto by being held thereon by a clamp 24. The other end of the bellows 23 has a relatively soft sealing means 25 removably fastened thereto. The relatively soft sealing means 25 has an enlarged opening 26 formed in the center thereof to enable the relatively soft sealing means 25 to slide along the spout 15.

When the spout 15 is inserted in the fill pipe opening 16 as shown in Figure 2, the relatively soft sealing means 25 engages the end of the fill pipe 17 to form a seal therewith through being compressible. Thus, any vapor within the tank being filled can flow from the tank through the fill pipe opening 16 and the opening 26 in the relatively soft sealing means 25 into an annular passage 27, which is formed between the bellows 23 and the spout 15.

The spout 15 has two latch rings 28 and 29 formed thereon for engagement with a lip 30 of the fill pipe 17 to hold the free end of the spout 15 within the fill pipe 17. Thus, the spout 15 can be held in two different positions within the fill pipe 17.

Each of the latch rings 28 and 29, which are identical, is selectively positioned along the length of the spout 15. As shown in Figure 8, the latch ring 28 has an eccentric retaining lug 31. It is necessary for the retaining lug 31 of each of the latch rings 28 and 29 to be positioned on the bottom of the spout 15. The retaining lug 31 has a threaded passage to.receive a set screw 32 (see Figure 1) to retain each of the latch rings 28 and 29 on the spout 15 in the desired spaced relation to each other.

As shown in Figure 1, the retaining lug 31 of each of the latch rings 28 and 29 has an inlined surface or shoulder 33 formed at an angle to insure that the retaining lug 31 will not slip off the lip 30 of the fill pipe 17. The angle of the inclined surface or shoulder 33 must be selected so that the retaining lug 31 will not catch on the lip 30 of the fill pipe 17 to such an extent that it cannot be removed. The inclined surface or shoulder 33 preferably has an angle of 15 to the spout 15.

The retaining lug 31 of each of the latch rings 28 and 29 provides a minimum blockage to vapor flow through the fill pipe opening 16 as shown in Figure 2 when the spout 15 is locked by the retaining lug 31 of the latch ring 29 engaging the lip 30 of the fill pipe 16. If the retaining lug 31 of the latch ring 28 engages the lip 30, there is the additional advantage of the retaining lug 31 of the latch ring 29, which is disposed within the bellows 23, also blocked the annular passage 27 to a minimum.

As shown in Figure 1, the relatively soft sealing means 25 includes a member 35, which is formed of a suitable compressible material such as soft rubber or foam rubber, for example, and a steel plate 36, which is bonded to the member 35.

The thickness of the member 35 depends upon the material of which it is formed. The member 35 must have sufficient thickness so that it will be resilient enough to form a seal with the fill pipe 17 but not so thick as to be too soft and not form the seal with the fill pipe 17.

The support plate 36 abuts an annular base plate 40 of a retainer 41, which is formed of a rigid material. The retainer 41 can be formed of a suitable metal or synthetic plastics material having the desired rigidity and is preferably formed of an acetal plastics material such as Defrin (Registered Trade Mark), for example.

The retainer 41 has a curved inner portion 42 overlapping the inner surface of the annular plate 36. The curved inner portion 42 is formed with a radius of curvature so that the retaining lug 31 of each of the latch rings 28 and 29 moves smoothly thereover during movement of the spout 15 with respect to the retainer 41 and the relatively soft sealing means 25.

A retaining ring 43, which is formed of a plastics material, for example, is disposed adjacent the base plate 40 of the retainer 41 to retain an enlarged end 44 of the bellows 23 there-between. The retaining ring 43 has a recess 45 formed therein to receive the enlarged end 44 of the bellows 23 with the enlarged end 44 being retained between the retaining ring 43 and the base plate 40 of the retainer 41.

A pair of screws 46, which are diametrically disposed to each other, extends through holes 47 in the retaining ring 43 and into threaded holes 48 in the base plate 40 of the retainer 41 to secure the retainer 41 and the retaining ring 43 to each other. As shown in Figure 4, the plate 36 has a pair of diametrically disposed holes 49, which are not threaded, to receive the ends of the screws 46.

The securing of the retainer 41 and the retaining ring 43 to each other squeezes the enlarged end 44 of the bellows 23 between the retaining ring 43 and the annular base plate 40 of the retainer 41. The recess 45 in the retaining ring 43 has a groove for cooperation with a portion of the enlarged end 44 of the bellows 23 to prevent pulling out of the enlarged end 44 of the bellows 23 from the recess 45 after the bellows 23 has been squeezed between the retaining ring 43 and the annular base plate 40 of the retainer 41 by the screws 46 securing the retainer 41 and the retaining ring 43 to each other.

As shown in Figures 1 and 2, a cup-shaped cover 50 is disposed over the screws 46, the retaining ring 43, the outer surface of the base plate 40 of the retainer 41, the outer surface of the plate 36, and a portion of the outer surface of the member 35. The cover 50 has a pair of screws 51 (see Figures 3 and 5), which are diametrically disposed from each other and 90" from each of the screws 46, extending therethrough. The screws 51 also extend through non-threaded holes 52 in the retaining ring 43, non-threaded holes 53 in the base plate 40 of the retainer 41, and into threaded holes 54 (see Figures 4 and 5) in the annular plate 36 of the relatively soft sealing means 25.

Accordingly, the screws 51 not only retain the cover 50 in position but also enable the relatively soft sealing means 25 to be removably fastened to the end of the bellows 23. Thus, whenever the member 35 wears, the relatively soft sealing means 25 can easily be replaced through removing the two screws 51 and positioning another of the relatively soft sealing means 25 adjacent the base plate 40 of the retainer 41.

The opening 26 in the relatively soft sealing means 25 provides communication to the annular passage 27 from the fill pipe 17 through an opening defined by the inner curved portion 42 of the retainer 41. Thus, as shown in Figure 2, the member 35 engages the end of the fill pipe 17 to form a seal there-between while providing communication to the annular passage 27 which functions as part of the vapor return passage to vapor recovery equipment (not shown).

The retainer 41 has a pair of diametrically disposed ears 60 (see Figures 1 and 5) extending upwardly from diametrically disposed portions of the annular base plate 40. Each of the ears 60 has an opening 61 formed therein to receive an end 62 of a wire connector 63. Each of the ends of the wire connector 63 has a leg 64 extending therefrom with the legs 64, which are substantially parallel to the spout 15 and on opposite sides thereof, connected by a semi- circular portion 65 (see Figures 5 and 6).

The semicircular portion 65 of the wire connector 63 is supported on an arcuate flange 66, which extends for a slightly less distance than the semicircular portion 65 as shown in Figure 6, of a spring retainer 67. The retainer 67 is a hollow cylindrical body 68 having the arcuate flange 66 extending from one side thereof and a second arcuate flange 69 extending from one opposite side thereof. As shown in Figure 6, the arcuate flange 69 extends a smaller angular amount than the arcuate portion 66. As shown in Figures 1 and 2, the flange 66 is closer to the relatively soft sealing means 25 than the flange 69.

The arcuate flange 69 supports a portion of a spring 72, which has its tab end 73 disposed in a slot 74 (see Figures 5 and 7) in the cylindrical body 68. The bottom of the slot 74 and the support surface of the flange 69 are in the same plane. The cylindrical body 68 has a protrusion 75, which is diametrically disposed to the slot 74, extending therefrom to overlie a portion of the spring 72 to retain the overlying portion of the spring 72 between the protrusion 75 and the arcuate flange 69.

The spring 72 extends from the spring retainer 67 in surrounding relation to a portion of the spout 15. The spring 72 has its other tab end disposed in an opening (not shown) in a slidable cylindrical member 78, which is slideably supported within the outlet 14 of the body 10.

As shown in Figure 7, the slot 74 in the spring retainer 67 extends for a substantially greater distance than the size of the tab end 73 of the spring 72. Thus, there can be relative rotation between the spring retainer 67 and the spout 15 since the cylindrical member 78 cannot rotate relative to the spout 15 and the other tab end of the spring 72 is fixed to the cylindrical member 78 while the slot 74 enables relative motion of the tab end 73 of the spring 72 with respect to the spring retainer 67. Accordingly, the spout 15 can rotate relative to the relatively soft sealing means 25 and the spring retainer 67, which has the relatively soft sealing means 25 pivotally connected thereto.

The slidable cylindrical member 78 is a portion of a check valve 97, which also includes a seat ring 80 on the spout 15. The check valve 79 embodies a principal feature of the invention claimed in this application, and the relatively soft sealing means 25 with the related structure is in itself the subject of a separate invention.

Both the ring 80 and the slidable member 78 are concentric to the longitudinal axis of the portion of the spout 15 on which the ring 80 is mounted. The ring 80, which has its surface 82 inclined to provide more streamlined flow of the vapor within the annular passage 27, is secured to the spout 15 by suitable means such as a pair of set screws disposed 90" from each other, for example. The ring 80 has a groove in its inner surface to receive an O-ring 83 to form a seal with the outer surface of the spout 15 on which the ring 80 is mounted.

The ring 80 has an annular projection or shoulder 84 formed thereon adjacent its periphery for cooperation with an annular resilient disc 85, which is preferably formed of rubber and is fixed to an end face 86 of the slidable member 78 and retained thereon by spring 72.

The annular projection 84 on the ring 80 engages the resilient disc 85 intermediate its ends as shown on Figure 1 to form a seal therebetween.

The resilient disc 85 is retained in the slidable member 78 within a recess 87 (see Figure 2), which is formed by an enlarged annular portion 88 of the slidable member 78. The portion 88 has the opening which has the other tab end of the spring 72 disposed therein, formed therein. Thus, a portion of the spring 72 is disposed in the recess 86.

The inner surface of the annular resilient disc 85 terminates in alignment with the inner ends of three lugs 89, which are equally angularly spaced from each other, at the junction the enlarged annular portion 88 and a hollow cylindrical portion 90 of the slidable member 78. The resilient disc 85 has its flat surface, which is engaged by the annular projection 84 on the ring 80, substantially perpendicular to the longitudinal axis of the portion of the spout 15 on which the ring 80 is mounted. Thus, when there is relative movement between the ring 80 and the slidable member 78, there is axial motion of the resilient disc 85 relative to the annular projection 84 on the ring 80 in the direction of the longitudinal axis of the portion of the spout 15 having the ring 80 mounted thereon.

A spring 91, which has one end acting against the lugs 89 on the slidable member 78 and its other end acting against a ring 92 of a guide 93, continuously urges the resilient disc 85 of the slidable member 78 against the annular projection 84 on the ring 80 to seal the annular passage 27 from communication with the vapor recovery equipment. The guide 93 is disposed in a longitudinal slot 94 in the slidable member 78 to prevent relative rotation of the slidable member 78 during its sliding motion relative to the body 10. The guide 93 has a forked end to fit over a portion of the spout adapter 18 so as to not rotate with respect thereto whereby relative rotation of the slidable member 78 with respect to the spout 15 is prevented.

In addition to having the longitudinal slot 94 formed in the hollow cylindrical portion 90 of the slidable member 78, the hollow cylindrical portion 90 has a longitudinal cut out portion 95 (see Figure 3) formed therein with its centerline 90 from the centerline of the slot 94. The cut out portion 95, which extends for the length of the hollow cylindrical portion 90 of the slidable member 78, provides conumuni- cation from the interior of the slidable member 78 to a vapor return passage 96 in the body 10.

The vapor return passage 96 communicates through a hose 97 (see Figure 1) with the recovery equipment.

When the spout 15 has its free end inserted in the fill pipe opening 16 as shown in Figure 2, the spring 72 is compressed. This causes the spring 91 to be overcome to move the slidable member 78 and the resilient disc 85 away from the annular projection 84 on the ring 80. This results in the annular passage 27 no longer being sealed by the resilient disc 85 engaging the annular projection 84 on the ring 80 so that vapor can flow from the vehicle tank, which is being filled, through its fill pipe 17, the opening 16 of the fill pipe 17, the opening 26 in the relatively soft sealing means 25, the annular passage 27, the cut out portion 95 in the slidable member 78, and the vapor return passage 96 in the body 10 to the vapor return hose 97.

Thus, the vapor recovery equipment, which is connected to the vapor return hose 97, communicates with the vehicle tank being filled to receive the vapor therefrom. However, it cannot communicate with the atmosphere because the resilient, disc 85 moves away from the annular projection 84 of the ring 80 only after the spring 72 has been compressed sufficiently through disposing the free end of the spout 15 within the fill pipe opening 17 and holding it therein by the retaining lug 31 one one of the latch rings 28 and 29.

Vapor cannot flow between the bellows 23 and the portion 88 of the slidable member 78 because a portion 98 of the bellows 23 is disposed in a groove 99 in the portion 88 of the slidable member 78 and clamped thereto by clamp 24a. The free end of the bellows 23 is retained against the body 10 by the clamp 24.

As a result of clamping the bellows 23 by the clamp 24 and clamping the portion 98 to the slidable member 78, by the clamp 24a, a portion 100 of the bellows 23 flexes when the slidable member 78 is moved from the position of Figure 1 to the position of Figure 2 to enable vapor flow to occur from the annular passage 27 to the vapor return hose 97.

The slidable member 78 functions as an interlock sleeve to allow liquid flow through the body 10 only if the relatively soft sealing means 25 is in sealing engagement with the end of the fill pipe 17 when the spout 15 is inserted in the fill pipe opening 16 to supply the liquid thereto. Thus, the slidable member 78 functions to control liquid flow through the spout 15 and has the resilient disc 85 thereon to control vapor flow from the annular passage 27 to the vapor return hose 97 so that the vapor recovery equipment, which is connected to the vapor return hose 97, cannot communicate with the atmosphere at any time.

Considering the operation of the present invention, the free end of the spout 15 is inserted into the fill pipe opening 16. As the spout 15 is inserted into the fill pipe opening 16, the member 35 of the relatively soft sealing means 25 engages the end of the fill pipe 17 as shown in Figure 2. As the spout 15 continues to be moved into the fill pipe opening 16, the bellows 23 and the spring 72 are compressed.

This is because the bellows 23 is fixed to the body 10, which has the spout 15 connected thereto so that the body 10 is moving towards the fill pipe 17 while the end of the bellows 23 secured to the retainer 41 through the retaining ring 43 cannot move. Since the spring retainer 67 can only pivot about its connection through the wire connector 63 to the retainer 41, the spring retainer 67 also is prevented from moving with the spout 15 as the spout 15 moves into the fill pipe opening 16.

As the spout 15 is advanced into the fill pipe 17 after the spring 72 has been compressed to load the relatively soft sealing means 25, the spring 9 1 is overcome so that the resilient disc 85 on the slid able member 78 is moved away from the annular projection 84 on the ring 80, which is mounted on the spout 15. When this occurs, vapor flow can occur from the annular passage 27 to the vapor return hose 97. Further insertion of the spout 15 into the fill pipe is accommodated by additional compression of spring 72. This is to accommodate fill pipes of various construction.

The total motion of the slidable member 78 relative to the ring 80 and the nozzle body 10 is limited by a face 101 of the slidable member 78 engaging front end 102 of the body 10. Thus, there is a maximum compression of the spring 91.

When flow through the spout is stopped, either automatically or manually the spout 15 is removed from the fill pipe opening 16. During removal of the spout 15 from the fill pipe opening 16, the spring 72 starts to expand first.

When the spring 72 has expanded sufficiently so that the forces produced by the spring 72 and 91 are equal, the spring 91 begins to expand but at a different rate than that at which the spring 72 is still expanding. As a result, the springs 72 and 91 cooperate to cause the resilient disc 85 to be moved into engagement with the annular projection 84 on the ring 80 during the removal of the spout 15 from the fill pipe opening 16.

When the resilient disc 85 engages the annular projection 84 on the ring 80, the spring 72 has still not completed its expansion so that it is still exerting a force against the relatively soft sealing means 25 to cause the relatively soft sealing means 25 to be in sealing engagement with the fill pipe 17. Therefore, the check valve 79 is closed before the relatively soft sealing means 25 ceases to have sealing engagement with the fill pipe 17. This insures that communication between the annular passage 27 and the vapor return hose 97 is blocked before the relatively soft sealing means 25 ceases to have sealing engagement with the fill pipe 17.

While the present invention has shown and described the resilient disc 85 as being mounted on the slidable member 78, it should be understood that the ring 80 could have the resilient sealing disc 85 formed thereon. In this arrangement, the annular projection 84 would be removed from the ring 80 and an annular projection formed on the slid able member 78.

Referring to Figures 9 and 10, there is shown another form of the check valve of the present invention utilized with a different type of sealing arrangement at the fill pipe 17. In this embodiment, a bellows 123 replaces the bellows 23. While one end of the bellows 123 is secured to the body 10 by the clamp 24 in the same manner as the bellows 23, the other end of the bellows 123 has an enlarged member 125 integral therewith. The member 125 has an enlarged opening 126 formed in the center thereof to enable the member 125 to slide along the spout 15.

When the spout 15 is inserted in the fill pipe opening 16 as shown in Figure 10, the member 125 engages the end of the fill pipe 17 to form a seal therewith so that any vapor within the tank being filled can flow from the tank through the fill pipe opening 16 and the opening 126 in the member 125 into an annular passage 127, which is formed between the bellows 123 and the spout 15.

The flow through the annular passage 127 to the vapor return hose 97 (see Figure 1) is controlled by a check valve 132 (see Figure 9), which permits flow only when the spout 15 is inserted within the fill pipe opening 16 so that the enlarged member 125 of the bellows 123 seals at the end of the fill pipe 17. Thus, the check valve 132 does not permit communication of the vapor recovery equipment, which is connected to the vapor return hose 97, through the annular passage 127 to the atmosphere. The check valve 132 includes a ring 133 utilized in place of the ring 80 and a slidable cylindrical member 134 employed instead of the slidable member 78.

The slidable cylindrical member 134 is formed with a longitudinal cut out portion, which is the same as the longitudinal cut out portion 95 of the slidable cylindrical member 78, to provide communication between the annular passage 127 and the passage 96 (see Figure 31 in the body 10. This provides communication to the vapor return hose 97 (see Figure 1) from the annular passage 127 (see Figures 9 and 10).

The ring 133 is secured to the spout 15 by suitable means such as a set screw 135, for example. The ring 133 has a groove in its inner surface to receive an O-ring 137 to form a seal with the outer surface of the spout 15 on which the ring 133 is mounted.

The ring 133 has a conical surface 138 formed thereon and generated from the same curve as a conical surface 139 on the slidable member 134. The conical surface 138 of the ring 133 has a groove therein to receive an Oring 141.

The O-ring 141 engages the conical surface 139 of the slidable member 134 to prevent vapor flow between the vapor return hose 97 and the annular passage 127. The spring91 acts between the ring 92 of the guide 93 and guide legs 142 of the slidable member 134 to hold the conical surface 139 of the slidable member 134 is sealing engagement with the O-ring 141.

The slidable member 134 has a groove 143 to receive a portion 144 of the bellows 123 therein for retention by a clamp 24a. Thus, the bellows 123 has a portion between the groove 143 and the clamp 24 flex in the same manner as discussed with respect to Figures 1 and 2.

A spring 146 replaces the spring 72 of Figures 1 and 2 upper end of the spring 146 is retained within a retainerl47. The retainer 147 moves against a member 148, which is secured to the bellows 123. The lower end of the spring 146 engages an annular retainer plate 149.

The operation of the embodiment of Figures 9 and 10 is the same as that for the apparatus of Figures 1 and 2 except that the O-ring 141 on the ring 133 engages the conical surface 139 of the slidable member 134 to prevent communication between the annular passage 127 and the vapor return hose 97.

The O-ring 141 can be mounted in the conical surface 139 of the slid able member 134 through forming a groove in the conical surface 139. In this arrangement, the groove would be eliminated from the ring 133 so that the 0ring 141 could engage the conical surface 138 of the ring 133.

While the check valve 79 has been shown as being utilized with the seal of the aforesaid McMath et al application for "Liquid Dispensing Nozzle Having A Sealing Arrangement For Vapor Recovery," it should be understood that the check valve 79 may be readily utilized with any type of seal for sealing the fill pipe opening to enable vapor recovery from the tank being filled. Thus, the check valve 79 of Figures 1 and 2 could be utilized with the seal of Figures 9 and 10, for example. Furthermore, the check valve 132 of Figures 9 and 10 could be utilized with the seal of Figures 1 and 2 or any other seal for sealing the fill pipe opening 16 to enable vapor recovery from the tank being filled.

An advantage of each of the illustrated constructions is that less force is required to move the sealing member between its open and closed positions because of reduced friction forces due to the unique seal construction.

Another advantage is that a more reliable seal is provided.

For purposes of exemplification, particular embodiments of the invention have been shown and described according to the best present understanding thereof. However, it will be apparent that changes and modifications in the arrangement and construction of the parts thereof may be resorted to without departing the spirit and scope of the invention.

WHAT WE CLAIM IS: 1. A liquid dispensing nozzle comprising a body; a spout extending from said body and having its free end arranged for insertion in an opening of a fill pipe of a tank or the like; means to return vapour from the tank being filled to permanently remove the vapour from the tank to an area in which the vapour is collected for recovery; said vapour return means having no communication with said spout except through the tank being filled; first sealing means to form a seal between the fill pipe opening and said vapour return means when said spout is disposed in the fill pipe; second sealing means, separate from said first sealing means, to seal said vapour return means when said spout is not disposed in the fill pipe to prevent vapour from entering the atmosphere through said vapour return means from the area in which it is collected, said second sealing means being disposed within said vapour return means in space relation to said first sealing means, and means responsive to said first sealing means being in its sealing position to cause said second sealing means to cease to be in its sealing position only after said first sealing means is in its sealing position.

2. The nozzle according to Claim 1 in which said second sealing means includes first means mounted on said spout within said spout return means, second means slidably supported by said body, said first and second means having sealing means to form a seal therebetween when said spout is not disposed in the fill pipe, and said causing means includes means to cause relative movement between said first and second means when said spout is disposed in the fill pipe to render said sealing means of said first and second means ineffective.

3. The nozzle according to Claim 2 in which said vapour return means includes compressible means disposed in spaced relation to said spout to form an annular passage therebetween, one end of said compressible means being secured to said body, the other end of said compressible means having said first sealing means connected

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (15)

**WARNING** start of CLMS field may overlap end of DESC **. which is the same as the longitudinal cut out portion 95 of the slidable cylindrical member 78, to provide communication between the annular passage 127 and the passage 96 (see Figure 31 in the body 10. This provides communication to the vapor return hose 97 (see Figure 1) from the annular passage 127 (see Figures 9 and 10). The ring 133 is secured to the spout 15 by suitable means such as a set screw 135, for example. The ring 133 has a groove in its inner surface to receive an O-ring 137 to form a seal with the outer surface of the spout 15 on which the ring 133 is mounted. The ring 133 has a conical surface 138 formed thereon and generated from the same curve as a conical surface 139 on the slidable member 134. The conical surface 138 of the ring 133 has a groove therein to receive an Oring 141. The O-ring 141 engages the conical surface 139 of the slidable member 134 to prevent vapor flow between the vapor return hose 97 and the annular passage 127. The spring91 acts between the ring 92 of the guide 93 and guide legs 142 of the slidable member 134 to hold the conical surface 139 of the slidable member 134 is sealing engagement with the O-ring 141. The slidable member 134 has a groove 143 to receive a portion 144 of the bellows 123 therein for retention by a clamp 24a. Thus, the bellows 123 has a portion between the groove 143 and the clamp 24 flex in the same manner as discussed with respect to Figures 1 and 2. A spring 146 replaces the spring 72 of Figures 1 and 2 upper end of the spring 146 is retained within a retainerl47. The retainer 147 moves against a member 148, which is secured to the bellows 123. The lower end of the spring 146 engages an annular retainer plate 149. The operation of the embodiment of Figures 9 and 10 is the same as that for the apparatus of Figures 1 and 2 except that the O-ring 141 on the ring 133 engages the conical surface 139 of the slidable member 134 to prevent communication between the annular passage 127 and the vapor return hose 97. The O-ring 141 can be mounted in the conical surface 139 of the slid able member 134 through forming a groove in the conical surface 139. In this arrangement, the groove would be eliminated from the ring 133 so that the 0ring 141 could engage the conical surface 138 of the ring 133. While the check valve 79 has been shown as being utilized with the seal of the aforesaid McMath et al application for "Liquid Dispensing Nozzle Having A Sealing Arrangement For Vapor Recovery," it should be understood that the check valve 79 may be readily utilized with any type of seal for sealing the fill pipe opening to enable vapor recovery from the tank being filled. Thus, the check valve 79 of Figures 1 and 2 could be utilized with the seal of Figures 9 and 10, for example. Furthermore, the check valve 132 of Figures 9 and 10 could be utilized with the seal of Figures 1 and 2 or any other seal for sealing the fill pipe opening 16 to enable vapor recovery from the tank being filled. An advantage of each of the illustrated constructions is that less force is required to move the sealing member between its open and closed positions because of reduced friction forces due to the unique seal construction. Another advantage is that a more reliable seal is provided. For purposes of exemplification, particular embodiments of the invention have been shown and described according to the best present understanding thereof. However, it will be apparent that changes and modifications in the arrangement and construction of the parts thereof may be resorted to without departing the spirit and scope of the invention. WHAT WE CLAIM IS:

1. A liquid dispensing nozzle comprising a body; a spout extending from said body and having its free end arranged for insertion in an opening of a fill pipe of a tank or the like; means to return vapour from the tank being filled to permanently remove the vapour from the tank to an area in which the vapour is collected for recovery; said vapour return means having no communication with said spout except through the tank being filled; first sealing means to form a seal between the fill pipe opening and said vapour return means when said spout is disposed in the fill pipe; second sealing means, separate from said first sealing means, to seal said vapour return means when said spout is not disposed in the fill pipe to prevent vapour from entering the atmosphere through said vapour return means from the area in which it is collected, said second sealing means being disposed within said vapour return means in space relation to said first sealing means, and means responsive to said first sealing means being in its sealing position to cause said second sealing means to cease to be in its sealing position only after said first sealing means is in its sealing position.

2. The nozzle according to Claim 1 in which said second sealing means includes first means mounted on said spout within said spout return means, second means slidably supported by said body, said first and second means having sealing means to form a seal therebetween when said spout is not disposed in the fill pipe, and said causing means includes means to cause relative movement between said first and second means when said spout is disposed in the fill pipe to render said sealing means of said first and second means ineffective.

3. The nozzle according to Claim 2 in which said vapour return means includes compressible means disposed in spaced relation to said spout to form an annular passage therebetween, one end of said compressible means being secured to said body, the other end of said compressible means having said first sealing means connected

thereto to enable vapour to flow through the annular passage, and said sealing means of said first and second means sealing the annular passage.

4. The nozzle according to Claim 3 in which said compressible means includes a bellows having one end connected to said body.

5. The nozzle according to Claim 4 including means to form a seal between said bellows and said second means.

6. The nozzle according to Claim 3 in which said sealing means of said first and second means includes a substantially flat sealing surface on one of said first and second means and disposed substantially perpendicular to the longitudinal axis of the portion of said spout on which said first means is mounted, and the other of said first and second means has a surface substantially parallel to said substantially flat sealing surface for engagement thereby to form the seal therebetween.

7. The nozzle according to Claim 6 in which each of said first and second means is concentric to the portion of said spout having said first means mounted thereon.

8. The nozzle according to Claim 3 in which said sealing means of said first and second means includes a sealing member mounted on said first means.

9. The nozzle according to Claim 8 in which each of said first and second means has a conical surface, and said conical surface of said first means has an O-ring therein to engage said conical surface of said second means to form seal therebetween, said O-ring comprising the sealing member.

10. The nozzle according to Claim 9 in which each of said first and second means is concentric to the portion of said spout having said first means mounted thereon.

11. The nozzle according to Claim 3 in which said sealing means of said first and second means includes a sealing member mounted on said second means.

12. The nozzle according to Claim 11 in which said sealing means of said first and second means includes a substantially flat sealing surface on one of said first and second means and disposed substantally perpendicular to the longitudinal axis of the portion of said spout on which said first means is mounted and the other of said first and second means has a surface substantially parallel to said substantially flat sealing surface for engagement thereby to form the seal therebetween.

13. The nozzle according to Claim 3 in which each of said first and second means has a conical surface, and one of said conical surfaces has an O-ring therein to engage the other of said conical surfaces to form the seal therebetween.

14. The nozzle according to Claim 2 in which each of said first and second means is concentric to the portion of said spout having said first means mounted thereon.

15. A liquid dispensing nozzle substantially as specifically described herein with reference to Figure 1 to 8 or to Figures 9 and 10 of the accompanying drawings.