Fuel dispensing nozzle having single-handed hold open mechanism

Abstract

A fuel dispensing nozzle comprises a nozzle body defining a dispensing path extending between a distal inlet and a proximal outlet and configured to dispense fuel. A fuel flow valve is disposed in the nozzle body between the distal inlet and the proximal outlet. An actuation assembly movable to open the fuel flow valve is also provided. The nozzle also includes a shut-off mechanism operatively connected to the actuation assembly. A hand lever is pivotally connected with respect to the nozzle body, the hand lever being operatively connected to the actuation assembly so as to cause opening of the fuel flow valve when the hand lever is pivoted in a valve opening direction. The hand lever has a grasping portion extending between a proximal location nearer the proximal outlet and a distal location. The nozzle according to this aspect further includes a hold open mechanism including a trigger disposed at the proximal location of the hand lever. The trigger is pivotally connected to the hand lever and has an engaging element. A catch member is fixed with respect to the nozzle body and defines a plurality of catches corresponding to respective flow positions. The catches are each configured to receive the engaging element of the trigger.

Claims

1. A fuel dispensing nozzle comprising: a nozzle body defining a dispensing path extending upstream from a distal inlet downstream to a proximal outlet, said nozzle body having a handle portion defining a handle flow axis along which said dispensing path extends; a fuel flow valve disposed in said nozzle body and movable against a valve closure spring that normally maintains said fuel flow valve in a closed position, said fuel flow valve opening in an upstream direction so as to open along the handle flow axis against flow of fuel in said dispensing path; an actuation assembly having a shaft assembly on a downstream side of said fuel flow valve, said shaft assembly operative to move along said handle flow axis so as to cause said fuel flow valve to open; and a hand lever pivotally connected with respect to said nozzle body, said hand lever being operatively connected to said actuation assembly so as to cause opening of said fuel flow valve when said hand lever is pivoted in a valve opening direction; wherein said fuel flow valve is configured as a two-part valve having a primary poppet and a secondary poppet, a portion of said shaft assembly passing through said secondary poppet such that an end thereof is received in a recess defined in said primary poppet.

2. A fuel dispensing nozzle as set forth in claim 1, further comprising a spring-loaded check valve located in said nozzle body.

3. A fuel dispensing nozzle as set forth in claim 1, wherein said shaft assembly has a first shaft axially movable with respect to a second shaft, said second shaft being urged apart from said first shaft by an actuation assembly spring.

4. A fuel dispensing nozzle as set forth in claim 3, further comprising a hold open mechanism having: a trigger pivotally connected to said hand lever and having an engaging element; and a catch member fixed with respect to said nozzle body, said catch member defining a plurality of catches corresponding to respective flow positions, said catches each configured to receive said engaging element of said trigger.

5. A fuel dispensing nozzle as set forth in claim 4, further comprising a shut-off mechanism operative to disengage said hold open mechanism to close said fuel flow valve.

6. A fuel dispensing nozzle as set forth in claim 1, wherein said valve closure spring comprises a coil spring.

7. A fuel dispensing nozzle as set forth in claim 6, wherein said valve closure spring is situated on an upstream side of said fuel flow valve.

8. A fuel dispensing nozzle as set forth in claim 7, wherein said valve closure spring is situated between said fuel flow valve and a spring base member, said spring base member being fixed with respect to said nozzle body.

9. A fuel dispensing nozzle as set forth in claim 8, wherein said valve closure spring has a spring force falling in a range of 18-20 pounds.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A full and enabling disclosure of the present invention, including the best mode thereof directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended drawings, in which:

(2) FIG. 1 is a perspective view of a fuel dispensing nozzle in accordance with an embodiment of the present invention.

(3) FIG. 2 is an enlarged fragmentary cross-sectional view of the nozzle body of the nozzle of FIG. 1 with the flow valve in a closed position.

(4) FIG. 3 is an enlarged fragmentary cross-sectional view similar to FIG. 2 but with the flow valve in an open position at a first lesser flow.

(5) FIG. 4 is an enlarged fragmentary cross-sectional view similar to FIG. 3 but with the flow valve in an open position at a second greater flow.

(6) FIG. 5 is an enlarged perspective view of a preferred form of a trigger body that can be used with the hold open mechanism in the embodiment of FIG. 1.

(7) FIG. 6 is an enlarged fragmentary view showing a catch member attached to the nozzle body with the trigger engaged in accordance with the embodiment of FIG. 1.

(8) Repeat use of reference characters in the present specification and drawings is intended to represent same or analogous features or elements of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(9) Reference will now be made in detail to presently preferred embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations.

(10) FIG. 1 is a perspective view of a fuel dispensing nozzle 10 in accordance with an embodiment of the present invention. Nozzle 10 includes a nozzle body (generally 12) defining a main portion 14 and a handle portion 16. In this particular embodiment, the main portion 14 is substantially encased by a separate scuff guard 18 to lessen the occurrence of scratches and other damage to main portion 14. Similarly, handle portion 16 may be covered, as shown, by a separate “hand warmer” 20 to provide greater comfort for the user. Hand warmer 20 may, for example, have a textured outer surface to allow the user to maintain a better grip on nozzle 10. In some preferred embodiments, scuff guard 18 and hand warmer 20 may be formed of a suitable polymeric material.

(11) The distal end 22 of nozzle body 12 defines an inlet 24 (FIG. 2) for ingress of the fuel to be dispensed. In this regard, distal end 22 may preferably have a suitable fitting for attachment of a fuel dispenser hose. A spout 26 is in fluid communication with and extends from a fuel outlet at the proximal end 28 of nozzle body 12. In this embodiment, an unleaded spout spring 30 is located around a portion of the spout 26. In addition, a splash guard 32 is located at the end of spring 30 adjacent the proximal end 28 of nozzle body 12. A hand guard 34 extends from the nozzle body 12 and contains a hand lever 36. As is well-understood, hand lever 36 is grasped by a user and squeezed in order to allow flow of fuel though nozzle 10.

(12) Referring now to FIG. 2, nozzle 10 includes a hold open mechanism 38 allowing the user to maintain the hand lever 36 in a desired flow position without continuing to squeeze it. In this embodiment, the hold open mechanism comprises a trigger 40 pivotally connected to lever 36 that operatively engages a catch member 42 attached to nozzle body 12 (such as by screws as shown). Catch member 42 defines a plurality of catches (in this case two catches) corresponding to respective lesser and greater flow positions. In this embodiment, the respective catches are each formed as generally U-shaped notches 44a-b that receive an engaging member 46 of the trigger 40. Attachment of catch member 42 to nozzle body 12 advantageously overcomes variations between the lever, nozzle body, and hand guard which have created issues in hold open mechanisms of the prior art. The engaging member 46 in this embodiment comprises a cross pin carried by the body 48 of trigger 40 at a location spaced apart from the trigger's pivot point 50.

(13) Trigger 38 is moved by the user, such as by the user's index finger of the same hand that is squeezing lever 36, against the bias of a torsion spring 52 located around pivot point 50. Toward this end, trigger body 48 may include a tab portion 54 at the end opposite the pivot point 50 which is contoured to facilitate engagement by the user's finger. As can be seen in FIG. 2, the engaging member 46 normally rests against lever 36 in order to limit rotation of trigger 38 in the “free state” (i.e., the condition in which the hold open mechanism is not being used to maintain fluid flow).

(14) Certain other aspects of nozzle 10 will now be explained with reference to FIGS. 2-4. As noted above, nozzle body 12 has an inlet port 24 into which fuel from a connected hose will flow. When a fuel flow valve 56 is open, the fuel will continue through nozzle body 12 to an outlet of the nozzle body and into the spout 26. A check valve 58 opens under the fuel pressure to allow the flow, but closes when fuel is not being supplied in order to prevent any back flow.

(15) Flow valve 56 is urged against a stationary valve seat 60 by a coil spring 62.

(16) As shown, coil spring 62 extends axially between flow valve 56 and a spring base member 64 that is fixed with respect to nozzle body 12. For example, base member 64 may be attached by one or more radial arms (not shown) to an inner surface of nozzle body 12. In a preferred embodiment, spring 62 may have a spring force falling in a range of 18 to 20 pounds, with a spring rate of 14.31 lbs/inch being used in one exemplary embodiment.

(17) Flow valve 56 is pushed to the open position by a valve stem that is part of a dual shaft assembly 66 having a first outer shaft 68 and a second inner shaft 70. In particular, the valve stem is formed by an end of outer shaft 68. In this embodiment, flow valve 56 is actually a two-part valve having a primary poppet 72 and a secondary poppet 74. As shown, secondary poppet 74 is configured to form a valve seat for primary poppet 72. As illustrated in FIG. 3, axial movement of the valve stem against the force of spring 62 first separates primary poppet 72 from secondary poppet 74 to provide a first lesser rate of fuel flow through the nozzle (e.g., through passage 75). As shown in FIG. 4, further movement of the valve stem causes a larger diameter portion (i.e., a shoulder) of the valve stem to engage secondary poppet 74. Secondary poppet 74 is thus separated from seat 60 to provide a second greater rate of fuel flow through the nozzle. These lesser and greater rates of fuel flow correspond to catches 44a-b, respectively.

(18) Dual shaft assembly 66 is pushed toward the inlet 24 when the user grasps lever 36. In this embodiment, lever 36 is generally L-shaped, having a shorter portion 76 and a longer (grasping) portion 78. Pivot point 50 of trigger 38 is in this case located substantially at the intersection of shorter portion 76 and longer portion 78, as shown. Lever 36 is itself pivotally connected at the end of shorter portion 76 at a pivot point 80. As can be seen, pivot point 80 is in this case located near the top of nozzle body 12. A middle portion of shorter portion 76 engages the inner shaft 70 of dual shaft assembly 66 to move it toward the inlet 24. This causes outer shaft 68 to also move and open flow valve 56. When lever 36 is not being grasped (and when the hold open mechanism is not actuated), it is urged to the at rest potion shown in FIG. 2 by an internal spring 82 of dual shaft assembly 66. In a preferred embodiment, spring 82 may have a spring force falling in a range of 4 to 8 pounds, with a spring rate of 15.00 lbs/inch being used in one exemplary embodiment.

(19) As will now be described, dual shaft assembly 66 operates in conjunction with the nozzle's shut-off mechanism 84 to close flow valve 56 when the vehicle's tank is full. Mechanism 84 includes suitable locking elements, such as a plurality (e.g., two) rollers 86 carried by a roller holder 88. Holder 88 is attached to the underside of a diaphragm 90 and in this case includes a pair of lateral slots allowing the rollers 86 to move forward and aft with respect to the axial position of holder 88. Diaphragm 90 is itself connected on the other side to a piston 92 via a spring. Piston 92 can reciprocate in a sensing chamber in the nozzle body 12 defined by the diaphragm. Piston 92 is urged normally upward to the position shown in FIG. 2 by a spring.

(20) As can be seen, one side of piston 92 is in fluid communication with an upstream side of the fuel flow path via a channel 94. The other side of piston 92 is in fluid communication with a sensing port at the tip of nozzle 26 via a channel 96. During a normal dispensing event, shaft 70 is locked with respect to shaft 68 (as shown in FIGS. 3 and 4) by rollers 86. As a result, dual shaft assembly 66 will operate as a unit to open flow valve 56. This allows fuel to flow.

(21) As shown in FIGS. 3 and 4, fuel pressure causes fuel to accumulate on one side of piston 92, pushing it down. As a result, diaphragm 90 flexes down, moving rollers 86 into engagement with inner shaft 70 (as well as outer shaft 68). Note that the transverse channel in shaft 70 that receives the rollers has an axial width greater than the combined diameter of the two rollers in order to allow the rollers to more easily seat. Fuel flowing past the sensing port causes it to act as a venturi, generating a vacuum between diaphragm 90 and piston 92. This urges diaphragm 90 to move upward but it is resisted by the spring force. When the tank is full, the presence of fuel at the sensing port causes the vacuum to increase suddenly, causing diaphragm 90 to retract upward against the spring. This moves rollers 86 out of engagement with shaft 70. Because of spring 82, shaft 70 is now urged toward the shorter portion of lever 36. (Dowel 93 is fixed with respect to shaft 70 and moves in a longitudinal channel defined in shaft 68 to prevent relative rotation between the shafts.) In addition, because shaft 68 is no longer locked with shaft 70, spring 62 will push flow valve 56 fully closed. This will cause closure of flow valve 56 and release of the hold open mechanism.

(22) Referring now also to FIG. 6, certain additional aspects of the hold open mechanism can be most easily explained. As described above, catches 44a and 44b preferably have a U-shaped configuration, each with a leading side 98 and a trailing side 100. The leading sides are substantially perpendicular to an axis extending from the respective leading side to the pivot point 50 when the engaging element 46 is situated in that catch. When fuel is flowing normally (i.e., the shut-off mechanism is not activated), the total force, including that contributed by the expected fuel pressure and the spring 62, causes the hold open mechanism to be held in the locked state. When the flowing state stops, the dual shaft assembly locking mechanism decouples causing the fuel valve spring and fuel pressure forces to no longer be transmitted. At this state, the only force transmitted to the trigger and locking mechanism is the internal spring 82 in the dual shaft assembly. This force is less than the required force to keep the trigger locking mechanism engaged allowing the system to self-disengage when the flow is stopped. In particular, in this circumstance, the internal dual shaft force (considering friction between the catch 44 and the engaging element 46) is less than the torsional force on engaging element 46 due to spring 52.

(23) It can thus be seen that the present invention provides a novel fuel dispensing nozzle. Although the invention has been described using preferred embodiments, configurations, and components, any combinations of these features are included within the scope of the invention. Moreover, variations and modifications as would be recognized by those skilled in the art are within the scope of the present invention. Explanation is by way of example only and the disclosure is not meant to be limiting.