Venting system for a product dispensing device

Abstract

A device for containing and dispensing a product includes a piston secured to a base portion and a housing configured to be secured to the base portion, the housing including an open first end for receiving the piston and a second end for dispensing the product. At least one aperture is formed on a portion of the piston to allow air compressed in the device to flow there through.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood from reading the description which follows and from examining the accompanying figures. These are provided solely as nonlimiting examples of the invention. In the drawings:

FIG. 1 is a schematic showing a piston according to examples of embodiments of the invention;

FIG. 2 is a schematic showing a driving member of examples of the invention;

FIG. 3 is a schematic showing the assembled piston venting system according to examples of embodiments of the invention; and

FIG. 4 is a schematic showing a product dispensing device according to one or more examples of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

In the development and assembly of a product dispensing device, the formation of compressed air in the body of the device during filling of a product into the device and subsequent trapped head space air after filling have been identified as deterrents to proper filling and package performance. Accordingly, the piston venting system of examples of the invention is a device for evacuation of the trapped air that has formed between various components of the dispensing device.

FIG. 1 is a schematic showing a piston 10 according to an example of the invention. The piston 10 can be formed having a generally cylindrical cross-sectional shape with a tip end 17 and an open end 11. The piston can have any desirable shape such as square and oval and can be formed from any material, such as plastic. The open end 11 of the piston 10 can lead to a hollow interior of the piston 10 that is configured to receive, for example a driving device 25 described with respect to FIGS. 2 and 3. It should be appreciated that the hollow interior of the piston 10 can extend along any length of the piston 10. The interior of the piston 10 can be any shape and can have any desirable cross section designed to receive the driving device 25. Alternatively, the piston 10 could be formed without a hollow interior and be configured to engage the driving device 25 at an exterior surface thereof.

When air is forced in and around gap 9, venting of the compressed air is achieved by creating a vent hole 15 or a series of vent holes in the piston 10. It should be appreciated that the vent holes can be placed in any portion of the piston. For example, the vent 15 can be formed along an outer edge of the piston 10. As shown in FIG. 1, the vent 15 can be formed along a flange 13 of the piston 10. The flange 13 can be formed at a distance away from an outer edge of the piston 10 forming the gap 9 there between. The size of the gap 9 can be any size depending on the overall dimensions of the remaining features of the device according to examples of the invention. The flange 13 can extend around a portion of or completely around the body of the piston 10. By way of example, a plurality of vents 15 can be formed along the flange13 and can be any shape or size such as for example, an oval, conical, and/or square. Further, the vents 15 can be located anywhere along the length of the flange 13 as so desired. Additionally, the one or more vents 15 can be formed through the flange 13 substantially perpendicular to the movement of the piston 10 and/or flow of the product 20. However, it should be appreciated that the one or more vents 15 can be formed at any angle through the flange 13 depending on functional and/or manufacturing considerations. Accordingly, when air is forced in and around the gap 9, at least a portion of the air can escape from the gap 9 through the at least one vent 15.

The one or more vents 15 can lead to a secondary vent chamber 14. The secondary chamber 14 is formed in part by a forward piston seal 12 and a rear piston seal 18, and a contour of the outer surface of the piston 10. As such, air in the gap 9 is in fluid communication with the vent chamber 14 through the at least one vent 15. The vent chamber 14 can be in the shape of a channel like structure that is formed around the periphery of the piston 10. Alternatively, according to examples of the invention, the vent chamber 14 can be formed only around a portion of the periphery of the piston 10 and/or can be divided up and form multiple chamber sections. Further, the one or more chambers 14 are formed to be in fluid communication with one or more of the at least one vent 15. Therefore, multiple chambers 14 can be formed depending on the number of vents 15 created. The fluid communication between the gap 9, vent 15 and vent chamber 14 provides for the release of for example, the compressed air formed in the air gap 9. Accordingly, a reduction or prevention of a pressure build-up during filling of the device with a user product and/or at any other time during or after assembly of the device can be addressed or achieved.

FIG. 2 is a schematic showing an end portion 30 for a device according to an example of the invention. The end portion 30 can be secured to the structure of base portion 6 or can be formed integrally there with. The end portion 30 can provide an end support for the base portion 6 and have a generally flat bottom surface to allow the device to be stored vertically if desired. A driving device 25 can be a threaded rod or similar type structure that has one end secured to or embedded in the end portion 30 and the other end configured to engage the piston 10. The end configured to engage the piston 10 can be a flat surface or formed with one or more protrusions or grooves. As such, it should be appreciated that the piston engaging end can have any desirable shape and/or configuration. The driving device 25 may be generally parallel to the housing of the base portion 6 or can be formed at an angle if so desired. The driving device 25 is configured to receive the threads of the end portion 30 and move upwardly and downwardly depending on the rotation of the end portion 30 controlled by the user. Due to the connection between the driving device 25 and the piston 10, as the driving device 25 is moved upwardly or downwardly a corresponding movement of the piston 10 is generated. Accordingly, the movement of the product stored in the device is controlled by the movement of the piston 10.

FIGS. 3 and 4 are schematics showing a cross-sectional view of a portion of a product dispensing device created by the engagement of the housing 5 and the base assembly portion 6. After the housing 5 is filled with the consumer product 20, the base assembly 6 that includes the piston 10 and end portion 30 can be engaged with the housing 5. The open portion of the housing 5 at one end thereof, allows for insertion of the piston 10 into the housing 5. As shown in FIG. 3, one end of the driving device 25 is engaged with at least a portion of the piston 10. It should be appreciated that the driving device 25 can engage an interior portion of the piston 10 if the piston has a hollow portion, or can engage an outer end surface of the piston 10. Further, the driving device 25 can include a notch or protrusion or similar type structure to engage with a notch or protrusion or similar type structure of the piston 10 to provide for a secure connection with the piston 10 or portion thereof. Accordingly, one or more embodiments of the invention provide for a rotation of the end portion 30 which translates the move to the driving device 25 and correspondingly moves the piston 10 in a desired manner. Thus, the operable device end portion 30 can be located at or near an end of the device in order to drive the product from the opposite end of the device and be applied to the user.

The product dispensing device of an example of the invention can be tubular having a length with a greater dimension than a width. It should be appreciated that the device can be any size and configuration and can have a round, oval, square, rectangular, or any other desirable shape. Within a body of the housing 5, a reservoir or hollow area is provided that contains the product 20 to be discharged from the device. The housing 5 has side walls and one end forming a tip for dispensing the product and another end having an open portion. Therefore, the consumer product 20, such as lipstick, lip gloss, cream, or any other type of cosmetic product, can be filled into at least a portion of the reservoir area of the housing 5 to be stored and contained therein. It should further be appreciated that the product 20 can be a soft, semi-soft, hard, liquid, or other flowable product and can also be a gel, cream, or powder. An end piece, such as a cap or cap-like device can be placed over the tip dispensing end of the housing 5 before, during or after the product is filled into the housing in order to help contain the product in the housing.

As discussed above, the product dispensing device of one or more examples of the invention is created by connecting the housing 5 and the housing of the base assembly portion 6. As the housing 5 and base portion 6 are secured together, the forward piston seal 12 will engage an interior surface of the housing 5 reducing or preventing air from escaping between the forward piston seal 12 and housing 5. Similarly, the rear piston seal 18 will slidably engage an interior surface of the housing 5 forming a seal there between. As such, creating a seal between the housing 5 and the one or more seals will force the compressed air formed from the engaging of the housing 5 and base assembly 6, to flow into the air gap 9 and out through the at least one vent 15 into the vent chamber 14. According to an example of the invention, vents can be formed in the housing 5 and/or base portion 6 to allow the air in the vent chamber 14 to escape therein.

Accordingly, the secondary chamber 14 is formed in part by the forward piston seal 12 and the rear piston seal 18. As best shown in FIG. 3, the forward seal 12 and rear seal 18 have a first diameter that will allow the seals to engage the interior surface of the housing 5. By way of example, the chamber 14 can be formed from a contour of the piston 10 in an area of the piston between the forward 12 and rear 18 seals. The contour of the chamber can be any desirable shape having a diameter smaller than a diameter of the forward 12 and rear 18 seals. That is, the outer surface of the contour should not engage the interior surface of the housing 5 in order to allow an open area into which the air can flow when forced through the vent 15.

According to an example of the invention, both the forward piston seal 12 and rear piston seal 18 are continuously engaged with the interior wall of the housing 5 after the housing 5 and base assembly portion 6 are engaged. Alternatively, the forward seal 12 can continuously form an airtight seal while the rear seal 18 slides for a set distance in the housing 5 before contacting housing vents that allow the air contained in the vent chamber 14 to be released. As such, as the piston is slide forward in the housing 5, air is able to flow through the at least one vent hole 15 and into the at least one vent chamber 14. Accordingly, the vented piston of examples of the invention allows for assembly of the device containing the product with little or no pressurization. Thus, elimination of head space air during initial articulation of the package is addressed and/or achieved. Finally, the vented piston reduces or eliminates the creation of latent product release due to the reduction of residual pressurization.

The rear piston seal 18 may also have a single or series of slits (not shown) cut into its surface. These slits will act as a vent path for the compressed air when no housing vents are available. The flexibility of the rear piston seal 18 will allow the area around the slits to form back together or heal after the filling and manufacturing process is complete and pressure in the pack has decreased or been normalized. This healing process creates an airtight piston seal that allows this piston to be used with formulas containing volatiles and other elements where loss of these elements through a permanently opened vent would affect product performance and efficacy.

While exemplary embodiments of the invention have been described in conjunction with the embodiments outlined above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, exemplary embodiments of the invention, as set forth above, are intended to be illustrative, not limiting. Various changes may be made without departing from the sphere and scope of the invention.

Claims

1. A device for containing and dispensing a product, comprising: a base portion;a piston secured to the base portion;a first and second protrusion formed around a circumference of the piston;a housing configured to be secured to the base portion, the housing including a first end configured to receive the piston and a second end having at least one discharge hole to dispense the product; andat least one aperture formed on a portion of the piston,wherein when the base portion and housing are secured together, an airtight seal is created between the first and second protrusion and an inside surface of the housing, and wherein air is able to flow through the at least one aperture into a chamber formed by the first and second protrusion, the housing, and a channel portion of the piston.

2. The device according to claim 1, wherein the piston includes a first end and second end, the first end is configured to contact the product and the second end includes a flange formed around the circumference of the piston that extends a distance away from an outer surface of the piston creating a gap there between.

3. The device according to claim 2, wherein the at least one aperture is associated with the flange and a first end of the aperture is in fluid communication with the gap and another end of the aperture is in fluid communication with the chamber.

4. The device according to claim 3, wherein the first protrusion is formed near an outside edge of the flange and creates an airtight seal with the inside surface of the housing, and wherein the second protrusion is formed near the second end of the piston and forms an airtight seal with the inside surface of the housing.

5. The device according to claim 2, wherein the piston has a hollow interior and the second end of the piston forms an opening to the interior of the piston.

6. The device according to claim 5, further comprising: an operable member secured to the base portion, the operable member includes an extending portion configured to engage and control movement of the piston.

7. The device according to claim 6, wherein the extending portion engages the interior of the piston.

8. The device according to claim 7 wherein the operable member is controlled by the user.

9. The device according to claim 4, wherein the first and second protrusions have a first diameter, and the channel portion of the piston has a second diameter smaller than the first diameter and extends around an entire periphery of the piston.

10. The device according to claim 1, wherein the chamber is formed into more than one chamber, each chamber associated with a corresponding one of the at least one vents.

11. The device according to claim 2, wherein at least one of the at least one aperture is formed substantially perpendicular to a direction of movement of the piston.

12. The device according to claim 1, wherein said product is a cosmetic product.

13. The device according to claim 1, wherein the product is a lipstick product.

14. A device for containing and dispensing a product, comprising: a first portion configured to control a dispensing rate of the product from the device;a second portion securably attached to the first portion and including housing walls to contain the product;a piston secured to the first portion, the piston including a flange formed around a circumference of the piston; andat least one air escape vent associated with the flange,wherein the flange includes a first part and a second part, the first part forming a seal with respect to the housing walls and having a first diameter, and the second part having a diameter smaller than the first diameter, and wherein the at least one air escape vent extends through the second part.

15. A device according to claim 14, wherein the flange forms a cup circling a portion of an elongated projection of the piston.

16. A device according to claim 15, wherein the first part of the flange includes a first seal formed on a forward end of the flange and a second seal formed on a rear portion of the flange spaced apart from each other and configured to engage the housing walls.

17. A device according to claim 16, wherein the forward seal, rear seal, housing walls, and second part of the flange form a chamber there between, and wherein air flowing through the at least one air escape vent flows into the chamber.

18. A device according to claim 17, wherein the cup encircling the elongated projection of the piston forms a gap there between, and wherein air is forced into the gap by the seal formed from the first seal and flows in a direction substantially away from a direction of movement of the piston and through the air escape vent into the chamber.

19. A device according to claim 14, wherein at least one of the at least one air vents extends substantially perpendicular to a direction of movement of product out of the second portion.

20. A device according to claim 17, wherein the second seal formed on the rear portion of the flange has at least one slit formed therein configured to allow the air to escape into an area of one of the first and second portions.

21. A method of dispensing a product from a dispensing device, comprising: securing a piston to a first portion of the device, the piston including a flange formed around a circumference of the piston, filling a second portion of the device with product;securing the first portion to the second portion;forming a seal between a first part of the flange and an interior surface of the second portion, the first part of the seal including a forward seal and a rear seal spaced apart from each other and each having a same first diameter; andforcing air in a direction opposite to a direction of travel of the piston and through at least one air escape vent formed in a second part of the flange, the second part located between the forward seal and rear seal and having a diameter smaller than the first diameter.

22. A method according to claim 20, wherein the flange forms a cup circling a portion of an elongated projection of the piston.

23. A method according to claim 15, wherein the forward seal, rear seal, interior surface of the second portion, and second part of the flange form a chamber there between, and wherein air forced through the at least one air escape vent flows into the chamber.

24. A method according to claim 17, wherein the cup encircling the elongated projection of the piston forms a gap there between, and wherein air is forced into the gap by the seal formed from the first seal and flows in a direction substantially away from a direction of movement of the piston and through the air escape vent into the chamber.

25. A method according to claim 23, wherein the at least one vent chamber is formed in the flange substantially perpendicular to the direction of movement of the piston.