Trigger sprayer with improved venting system and methods of using the same

Abstract

A sprayer device with a trigger operated pump is operative for pumping and spraying liquid from an attached liquid container. The trigger sprayer includes valve body provided with a base portion that is configured to be mounted to the neck of the liquid container and a delivery nozzle from which the liquid is sprayed. A fluid flow path extends from the base portion to the delivery nozzle. A pumping chamber is in fluid communication with the flow passage and there is a vent opening between the pumping chamber and the interior of said base. A piston with spaced inboard and outboard seals is movable in the pumping chamber and the vent opening is located between the seals. A check valve is disposed between the vent opening and the interior of the base portion to prevent liquid from the container from backflowing into the pumping chamber during shipment and handling.

Claims

1. A trigger sprayer for pumping and spraying liquid from a liquid container, said trigger sprayer comprising: a valve body having a base, a delivery nozzle, a flow passage extending from an interior of said base to said delivery nozzle, a pumping chamber in fluid communication with said flow passage, and a vent opening between said pumping chamber and said interior of said base; a piston in the pumping chamber, said piston including an inboard seal and an outboard seal, said vent opening being located between said inboard seal and said outboard seal; and a check valve disposed between said vent opening and said interior of said base, wherein the check valve is configured and arranged to prevent liquid from the liquid container from entering the pumping chamber and is configured and arranged to allow atmospheric air to pass from the pumping chamber into the interior of the base during operation of the piston, and wherein said check valve comprises a valve seat extending directly from a wall of said pumping chamber into an interior of said base, and further comprises a valve body within said valve seat.

2. The trigger sprayer of claim 1 further comprising a dip tube retainer received within said base of said valve body, said dip tube retainer including a vent path.

3. The trigger sprayer of claim 2 wherein said vent path is in proximity to said check valve.

4. The trigger sprayer of claim 1 wherein said valve body is elastomeric.

5. The trigger sprayer of claim 4 wherein said valve body is a chevron valve.

6. The trigger sprayer of claim 4 further comprising a clip tube retainer received within said base of said valve body, said dip tube retainer including a vent path.

7. The trigger sprayer of claim 6 wherein said vent path is in proximity to said check valve.

8. A trigger sprayer for pumping and spraying liquid from a liquid container, said trigger sprayer comprising: a valve body comprising a chevron valve having a base, a delivery nozzle, a flow passage extending from an interior of said base to said delivery nozzle, a pumping chamber in fluid communication with said flow passage, and a vent opening between said pumping chamber and said interior of said base; a piston in the pumping chamber, said piston including an inboard seal and an outboard seal, said vent opening being located between said inboard seal and said outboard seal; a dip tube retainer having a body portion received within said base of said valve body, said body portion having a vent path; and a check valve in communication with the vent path and disposed between said interior of said base and an interior of said body portion of said dip tube retainer, wherein said check valve comprises a valve seat extending directly from said pumping chamber, and further comprises a valve body disposed within said valve seat.

9. The trigger sprayer of claim 8 wherein said check valve is in proximity to said vent opening.

10. The trigger sprayer of claim 8 wherein said valve body is elastomeric.

11. The trigger sprayer of claim 10 wherein said check valve is in proximity to said vent opening.

12. A trigger sprayer for pumping and spraying liquid from a liquid container, said trigger sprayer comprising: a valve body having a base, a delivery nozzle, a flow passage extending from an interior of said base to said delivery nozzle, a pumping chamber in fluid communication with said flow passage, and a vent opening between said pumping chamber and said interior of said base; a piston in the pumping chamber, said piston including an inboard seal and an outboard seal, said vent opening being located between said inboard seal and said outboard seal; a dip tube retainer having a body portion received within said base of said valve body, said body portion having a vent path; and a check valve in communication with the vent path and disposed between said interior of said base and an interior of said body portion of said dip tube retainer, wherein the check valve is configured and arranged to prevent liquid from the liquid container from entering the pumping chamber and is configured and arranged to allow atmospheric air to pass from the pumping chamber into the interior of the base during operation of the piston.

13. The trigger sprayer of claim 12 wherein said valve body is elastomeric.

14. The trigger sprayer of claim 13 wherein said check valve is in proximity to said vent opening.

15. The trigger sprayer of claim 12 wherein said valve body is a chevron valve.

16. The trigger sprayer of claim 12 wherein said check valve is in proximity to said vent opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) While the specification concludes with claims particularly pointing out and distinctly claiming particular embodiments of the instant invention, various embodiments of the invention can be more readily understood and appreciated from the following descriptions of various embodiments of the invention when read in conjunction with the accompanying drawings in which:

(2) FIG. 1 is a perspective view of an exemplary embodiment of a trigger sprayer having a vent check valve in accordance with the present invention;

(3) FIG. 2 is a top view thereof;

(4) FIG. 3 is an exploded perspective view thereof;

(5) FIG. 4 is a cross-sectional view thereof taken along line A-A of FIG. 2;

(6) FIG. 5 is an enlarged detail view of the vent passage and vent body taken from FIG. 4;

(7) FIG. 6 is a cross-sectional view thereof taken along line B-B of FIG. 2;

(8) FIG. 7 is a top view of another exemplary embodiment of a trigger sprayer according to the invention;

(9) FIG. 8 is an exploded perspective view thereof;

(10) FIG. 9 is a cross-sectional view thereof taken along line A-A of FIG. 7;

(11) and

(12) FIG. 10 is an enlarged detail view of the vent passage and vent body taken from FIG. 9.

DETAILED DESCRIPTION OF THE INVENTION

(13) Certain exemplary embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the device and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present disclosure. Further, in the present disclosure, like-numbered components of the embodiments generally have similar features, and thus within a particular embodiment each feature of each like-numbered component is not necessarily fully elaborated upon. Additionally, to the extent that linear or circular dimensions are used in the description of the disclosed systems, devices, and methods, such dimensions are not intended to limit the types of shapes that can be used in conjunction with such systems, devices, and methods. A person skilled in the art will recognize that an equivalent to such linear and circular dimensions can easily be determined for any geometric shape. Further, to the extent that directional terms like top, bottom, up, or down are used, they are not intended to limit the systems, devices, and methods disclosed herein. A person skilled in the art will recognize that these terms are merely relative to the system and device being discussed and are not universal.

(14) Referring now to the drawings, an exemplary embodiment of a trigger sprayer 10 is illustrated in FIGS. 1-6. While reference is made to trigger sprayers for liquids, it should be understood that the presently described types of spray devices can also be used to spray any type of fluids.

(15) The exemplary trigger sprayer 10 comprises an integrally molded valve body 12 provided with a base portion 14 that is configured to be mounted to a neck 16 of a liquid container 18. The exemplary base portion 14 may be snap fit or plug fit onto the neck 16 of the container 18 or may include a bayonet type connection, or threaded closure ring 20 or any other connection as known in the art. A gasket 22 may be received between the valve body 12 and the neck 16 of the container 18.

(16) Referring to FIG. 3, the trigger sprayer 10 further includes a contoured shroud 24 which encloses the valve body 12 at the rear, a trigger lever 26, and a discharge assembly 28 comprising a discharge valve 30, a spin mechanic 32 which controls the discharge spray pattern and a nozzle 34.

(17) Turing to FIGS. 4-6, the valve body 12 includes a liquid flow passage 35 (see flow arrows) that extends from the interior of the base portion 14 up through the valve body 12 to the delivery nozzle 34 to deliver liquid from the container 18 to the delivery nozzle 34. In some embodiments, a dip tube retainer 36 is received into the base portion 14 of the valve body 12. The dip tube retainer 36 includes a disc-shaped body portion 38 which is snap received into the interior of the base portion 14 of the valve body 12 and further includes an upwardly extending stem 40 which is received into the fluid flow passage 35. A dip tube 42 is received into a lower end of the stem 40 and extends down into the container 18 to provide a continuous flow path from the bottom of the container 18 to the delivery nozzle 34. A ball valve 44 is located at the upper end of the stem 40.

(18) The body 38 of the dip tube retainer 36 includes a vent path 46 to permit air to pass between the interior of the base portion 14 of the valve body 12 and the interior of the container 18.

(19) A trigger operated pump mechanism 48 includes a pumping chamber 50, a piston 52, a spring 53, and the trigger lever 26 that operates to draw fluid from the container 18 up through the dip tube 42 and deliver it to the delivery nozzle 34. The pumping chamber 50 is in fluid communication with the flow passage 35 through an aperture 54 in the upper portion of the pumping chamber 50 and there are vent openings 56 between the pumping chamber 50 and the interior of the base portion 14 of the valve body 12. The vent opening(s) 56 is/are more clearly shown in broken lines in enlarged FIG. 5, and also in the additional cross-sectional view in FIG. 6. Turning back to FIG. 4, the piston 52 includes spaced inboard and outboard chevron seals 58, 60 and is slidably movable within the pumping chamber 50 by operation of the trigger lever 26. The vent openings 56 are located between the seals 58, 60 and allow atmospheric air to pass during movement of the piston 52. To prevent liquid from the container 18 from backflowing or leaking into the pumping chamber 50 during shipment and handling, a check valve is disposed between the vent openings 56 and the interior of the base portion 14.

(20) In some embodiments, an exemplary check valve 62 may comprise a valve seat 64 which extends downwardly from the pumping chamber wall 66 into the interior of the base portion 14 and a valve body 68 received into the valve seat 64 (best seen in FIG. 5). The valve seat 64 may be cylindrical and is in communication with the vent openings 56. The exemplary valve body 68 is elastomeric and may comprise an annular, chevron type one-way valve body which allows air to pass from the vent openings 56 into the interior of the base portion 14 of the valve body 12, but prevents liquid from the container 18 from travelling back through the vent openings 56.

(21) Referring now to FIGS. 7-10, in another exemplary embodiment 10A, an exemplary check valve configuration 62A is integrated as part of the dip tube retainer 36A instead of within the base 14 of the valve body 12. Otherwise, the valve body 12, shroud 24 and discharge components 28 as described hereinabove are the same.

(22) With regard to the check valve configuration 62A, the vent openings 56A provide a direct air passage into the interior of the base portion 14A of the valve body 12A and the check valve 62A checks liquid flow from the container 18 through a vent opening 46A in the body 38A of the dip tube retainer 36A (See FIGS. 9 and 10). As best seen in FIGS. 8-10, the valve seat 64A protrudes upwardly from the body 38A of the dip tube retainer 36A into the interior of the base portion 14A towards the vent openings 56, and the valve body 68 is located within the valve seat 64A, received therein from beneath the dip tube retainer 36A. The dip tube retainer vent opening 46A is located in the upper wall of the valve seat 64A. In this regard, air passing from the pumping chamber 50 enters the interior of the valve body 12A and then passes downward into the valve seat vent opening 46A where further movement is checked by the valve body 68 seated therein.

(23) It can thus be appreciated that the exemplary embodiments provide unique configurations of a valve body, trigger pump and check valve assembly which simplifies and reduces the number of parts while also reducing the number of potential leak points between the liquid container and the valve body.

(24) While there is shown and described herein certain specific structures embodying various embodiments of the invention, it will be manifest to those skilled in the art that various modifications and rearrangements of the parts may be made without departing from the spirit and scope of the underlying inventive concept and that the same is not limited to the particular forms herein shown and described except insofar as indicated by the scope of the appended claims.