DISCHARGE CONTAINER

Abstract: In a discharge container (1) for discharging a liquid in a liquid reservoir tank (2) via a discharge port portion (21), a flexible member (18) which is normally closed but is expansion-opened by the pressure of the liquid is disposed at the discharge port portion (21) and the expansion-open portion of this flexible member (18) due to the liquid pressure is used as a discharge port portion (19).

Description: TECHNICAL FIELD The present invention relates to a liquid dispensing container for, for example milky lotion, hand cream, foundation, shampoo, rinse, liquid dentifrice, mayonnaise, ketchup, paste and paint. BACKGROUND ART One example of a conventional liquid dispensing container that dispenses liquid contained in a liquid storage chamber is shown in Figure 27. In this conventional liquid dispensing container, a flexible container body 101 that can be pressed and deformed constitutes a liquid storage chamber 102 for storing liquids. At the top of the container body 101 is formed a dispensing opening 103 which has a threaded portion 104 at its outer periphery. A cap 105 is removably screwed on the threaded portion 104 to prevent drying of liquid and leakage of it when not in use. In use, the cap 105 is taken off the container body 101 and the container body 101 is pressed to squeeze an appropriate amount of liquid from the liquid storage chamber 102 through the dispensing opening 103. With the above conventional art, however, one may forget to put the cap 105 on the container after use. Moreover, during frequent use of the container, capping is troublesome for the user and he or she may leave it uncapped intentionally or carelessly for a long period of time, during which the surface of the liquid present in the dispensing opening 103 is kept exposed to the air and as a result it dries. It is known that the air contains a variety of substances that may affect human health, such as bacteria and dust. These substances, when they become mixed in the liquid, contaminate the liquid and in some cases produce mold and discoloration, making it very unsanitary. When such unsanitary liquid is a cosmetic or food it causes undesirable results. EP-A-0410858 describes a dispensing device for liquids according to the preamble of claim 1 and 3, including an elastic displaceable stopper or plate which extends to the outlet nozzle and is deformed to create an outlet opening for the liquid. US-A-4415121 discloses a valve for spraying material as a mist includes walls forming an elongated passageway having an inlet and an outlet. The passageway is flattened at least at the outlet end. The flattened portion has opposed walls disposed in contact and at least one of the surfaces of the flattened portion has a plurality of capillary-like channels. Upstream from the channels, the valve has a flexible wall section which vibrates at its natural frequency when the material to be sprayed as a mist is forced through the passageway out of the valve. SUMMARY OF THE INVENTION An object of this invention is to provide an improved liquid dispensing container that solves the above problems. Another object of this invention is to provide a novel liquid dispensing container that can prevent air or external foreign substance from entering the dispensing port and the interior of the container body, prevent the liquid from drying and keep it sanitary. According to the invention there is provided a liquid dispensing container for dispensing liquid from a liquid storage chamber through a dispensing port, comprising: a container body for storing a liquid to be dispensed; a nozzle member connected to the container body and having a nozzle opening for dispensing liquid from the container, and a liquid passage communicating the interior of the container body with the nozzle opening; and an elastic member disposed in and surrounded by the nozzle member such that the elastic member normally closes the liquid passage; the elastic member having a fixed portion at an inner end thereof and a non-fixed portion at an opposite, outer end thereof, the non-fixed portion allowing throughflow of liquid upon pressure applied to the liquid; characterized in that the elastic member is formed of a thin metal plate which can deflect over a major part of its length to allow throughflow of liquid, and in that the outer end of the elastic member is set back from the nozzle opening such that the nozzle opening of the nozzle member functions as the dispensing port for finally dispensing the liquid out of the container body. The invention also provides a liquid dispensing container for dispensing liquid from a liquid storage chamber through a dispensing port, comprising: a container body for storing a liquid to be dispensed; a nozzle member connected to the container body and having a nozzle opening for dispensing liquid from the container, and a liquid passage communicating the interior of the container body with the nozzle opening; and an elastic member disposed in and surrounded by the nozzle member such that the elastic member normally closes the liquid passage; the elastic member having a fixed portion at least at an inner end thereof and a non-fixed portion at an opposite, outer end thereof, the non-fixed portion allowing throughflow of liquid upon pressure applied to the liquid; characterized in that the elastic member is formed of a film like member bonded to the nozzle member on both its sides as well as at its inner end, and in that the outer end of the elastic member is set back from the nozzle opening such that the nozzle opening of the nozzle member functions as the dispensing port for finally dispensing the liquid out of the container body. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a vertical cross section of one mode of this invention; Figure 2 is an enlarged vertical cross section of an essential portion of Figure 1; Figure 3 is a plan view of Figure 1 with a head cap removed; Figure 4 is a plan view of Figure 3 with a thin plate member removed; Figure 5 is an essential-part cross section showing a modified example of a limiting projection; Figure 6 is a perspective view of the thin plate member; Figure 7 is a perspective view of another example of the thin plate member; Figure 8 is a perspective view of still another example of the thin plate member; Figure 9 is a vertical cross section showing how the thin plate member is mounted; Figure 10 is a vertical cross section showing another example of how the thin plate member is mounted; Figure 11 is a perspective view showing still another example of how the thin plate member is mounted; Figure 12 is an essential-part plan view showing the thin plate member of Figure 11 mounted in place; Figure 13 is a vertical cross section showing another example of this invention; Figure 14 is a vertical cross section showing a further example of this invention; Figure 15 is a vertical cross section showing a further example of this invention; Figure 16 is a perspective view showing an essential portion of Figure 15; Figure 17 is a plan view of Figure 15 with the nozzle body removed; Figure 18 is a plan view of a further example of this invention; Figure 19 is a plan view of Figure 18 with the thin plate member removed; Figure 20 is a cross section showing an essential portion of a further example of this invention; Figure 21 is a cross section showing an essential portion of a further example of this invention; Figure 22 is an enlarged view of the portion A of Figure 21; Figure 23 is a cross section showing an essential portion of a further example of this invention; Figure 24 is a vertical cross section showing the second mode in which this invention is embodied; Figure 25 is a plan view of Figure 24 with the nozzle body removed; Figure 26 is a perspective view showing how the filmlike member is mounted; Figure 27 is a vertical cross section of an example of the prior art. PREFERRED MODES OF THE INVENTION Now, a liquid dispensing container as the first mode of this invention will be described with reference to the accompanying drawings. A container body 1 accommodates a soft bag 3 therein which forms a liquid chamber (liquid storage chamber) 2. While it is possible to use the interior of the container body 1 directly as the liquid chamber 2, the use of the soft bag 3 is advantageous because as the liquid contained is dispensed, the soft bag 3 contracts easily preventing the outer air from becoming mixed in. The soft bag 3 is attached, through a heat seal for preventing leakage, to a circumferential surface below an opening member 4 attached to the opening of the container body 1. The opening member 4 has a piston 5 on the inner side. Although the piston 5 shown has a separate piston body 6 secured thereto to exhibit an appropriate degree of elasticity and ensure a large opening, they may be formed in one piece. The piston 5 has a valve 7 that can open upwardly in the drawing. The valve 7 forms an exit for the liquid through an inner hole 8 communicating with the liquid chamber 2. A cylinder 10 biased upwardly by an elastic body 9 in the form of a spiral spring is fitted liquid-tightly and slidably in the piston 5. A resilient annular portion 11 provided to the outer circumferential wall of the piston body 6 is a sealing sliding portion for the inner circumferential wall of an inner hole 12 of the cylinder 10. The cylinder 10 has a valve 13 that can be opened upwardly in the drawing like the valve 7. The valve 13 forms an exit for the liquid that came out of the valve 7 into the inner hole 12. At the top of the cylinder 10 is mounted a nozzle body 14, which, as shown in the figure, includes a nozzle member 15 with a passage for the liquid coming out of the valve 13, a crown 16 formed either separately from or integrally with the nozzle member 15, and a thin plate member 18 fixed in the middle of a liquid passage 17 of the nozzle member 15. The thin plate member 18 normally closes the liquid passage 17 and is fixed at the rear part thereof. In use, the thin plate member 18 is elastically deformed, and portion at and near the front end of the liquid passage 17 come to serve as a dispensing portion 19. Under the crown 16 is formed an escape space 20 that allows the thin plate member 18 to be elastically deformed. The thin plate member 18 extends close to a nozzle 21 at the end of the liquid passage of the nozzle member 15 but is not exposed from the nozzle 21. This arrangement is contrived considering variations in the size of the thin plate members 18 due to forming and to ensure that the thin plate member 18 is prevented from being touched directly by fingers. Under the crown 16 is formed a limiting projection 22 that prevents excessive deflection of the thin plate member 18 in the escape space 20. As another structure to prevent the excess deflection of the thin plate member 18, it may be possible, as shown in Figure 5, to form limiting projection 23 at an upper part of the side wall portion of the liquid passage 17 and, after fixing the thin plate member 18, bend the projections inwardly. The prevention of excessive deflection of the thin plate member 18 ensures that the thin plate member 18 does not plastically deform and can return to its original shape with elapse of time. It also prevents the liquid from being dispensed in an excessive amount during use. Next, some examples of the thin metal plate member will be explained. The thin plate member 18 may be made of such a metal material as stainless steel, carbon steel, or copper alloy (phosphor bronze), optionally coated with polyamide, polyvinyl chloride, polyethylene or polyurethane, or a resin molded material as POM, ABS, PP, PET or PE. Appropriate selection can be made depending on the kind of liquid used. Coating of the metal material with resin improves the adhesion (sealing performance) and corrosion resistance. Next, how the thin plate member 18 is fixed will be explained. As shown in Figure 1 and Figures 2, 6 and 9, the enlarged views of Figure 1, the rear part of the thin plate member 18 may be curved and the rear portion 24 pressed into a fixing vertical groove 25 formed in the nozzle member 15. Alternatively, as shown in Figure 7 and 8, it is possible to press a flat, thin plate member 18 or a slightly curved thin plate member 18 into the fixing vertical groove 25 (see Figure 10). There are other various methods, and in another method, as shown in Figure 11, projections 27 are formed on the nozzle member 15, fixing holes 29 are bored in the rear portion of the thin plate member 18, the projections 27 are fitted in the fixing holes, and the projections 27 are fused to the projections 27 (see Figure 12). Reference numeral 30, in the thin plate member 18 of Figure 6, denotes a check projection which prevents the thin plate member 18 from coming off the fixing vertical grooves 25. This is not needed when the fixing force is sufficient. Now, an example of use will be described. When the crown 16 is pushed down, the cylinder 10 is slid downward in the figure of the drawing against the resilient force of the elastic body 9. At this time, the valve 13 is opened allowing the liquid to flow from the inner hole 12 of the cylinder 10 out into the liquid passage in the nozzle member 15, increasing the inner pressure and deforming the thin plate member 18 to open the dispensing portion 19. This establishes the liquid passage, then allowing the liquid to flow out of the nozzle 21 formed in the nozzle member 15. When the crown 16 is released from the depressing force, the thin plate member 18 returns to the original position closing the liquid passage again. At the same time, the cylinder 10 is slid upward (and returns to its original position) by the resilient force of the elastic body 9. At this time the valve 7 is opened allowing the liquid to flow from the inner hole 8 of the piston 5 out into the inner hole 12 of the cylinder 10, to prepare the next dispensing. In addition to the above arrangement, various other configurations may be adopted. For example, the valve 7 and the valve 13 need not be identical in position and shape with those shown. An example shown in Figure 13 uses a ball type valve mechanism, in which the opening member 4 secured to the container body 1 is fitted with a soft bag 3 in a manner similar to the preceding example. A cylinder 32 having a ball valve 31 is secured to the opening member 4, and in the cylinder 32 a piston body 34 provided with a cylinder portion 33 is slidably provided, biased by an elastic member 35 such as a coil spring. The piston body 34 is provided at its top with a nozzle member 36 (in this example, the crown is integrally formed with the nozzle member) similar to the one in the previous example. The liquid passage 37 is fixedly provided with the thin plate member 18. Next, the operation of this example will be explained. When the nozzle member 36 is depressed, the piston body 34 is slid downwardly in the figure against the resilient force of the elastic member 35, closing the ball valve 31 and compressing the liquid in the cylinder 32, which in turn deforms the thin plate member 18 to form the liquid passage allowing the liquid to be discharged out of the nozzle 38. When the nozzle member 36 is released from the depressing force, the resilient force of the elastic member 35 causes the piston body 34 to slide upward (and return to the original position). At this time, the ball valve 31 is opened (the ball moves up) allowing the liquid in the liquid chamber 2 to move into the cylinder 32. Because at this time the liquid passage is closed by the thin plate member 18, there is no possibility that air enters the liquid chamber through the liquid passage. In the case of an example shown in Figure 14 liquid is dispensed from the nozzle 40 by directly pressing the container body 39 with fingers. The dashed line in the figure show the state of the container body when the container body is depressed or the amount of liquid in the container body decreases. The container body 39 itself forms the liquid chamber and is made of a soft material such as silicone rubber, SBR, NBR, butyl rubber, elastomer, or polyethylene. The container body 39 has a constricted portion at the top, on which is screwed a nozzle member 36 similar to the one used in the preceding examples. The nozzle member 36 may be attached by another fixing means that employ recess-and-projection engagement, or by bonding. Compared with the two previous examples, this one, though not capable of dispensing a fixed amount of liquid, has advantages that the amount of liquid squeezed out can be changed according to the user's preference and the example can be manufactured inexpensively because of omission of the valve mechanism for dispensing a constant amount of liquid. An example shown in Figures 15 to 17 is a modification of the piston type container described above, which has a spacer 41 disposed below the lower end of the periphery of the nozzle member 15 inside the opening member 4. By changing the thickness of the spacer 41, the amount of liquid discharged out can be adjusted easily and with little additional cost. The spacer 41 has a plurality of ribs 42 formed at its periphery at regular intervals, so that the spacer 41 is press-fitted inside the inner circumferential wall of the opening member 4 in a somewhat deformed state (see Figure 17). In an example shown in Figure 18 and 19, a liquid sealant 43 with a low volatility is applied to the contact surface between the nozzle member 15 and the thin plate member 18 to prevent ingress of air into the liquid storage chamber during the product using the container is transported from the manufacture to a user. That is, even when the machining accuracy of the nozzle member 15 and the thin plate member 18 is high, there is a gap between them. The liquid sealant 43 is used to close this gap. After a user obtains the product, the liquid is present between the nozzle member 15 and the thin plate member 18 and therefore prevents air from entering the container. Figure 20 shows a modification of the liquid sealant 43, which is an adhesive tape 44 interposed between the nozzle member 15 and the thin plate member 18. This adhesive tape 44 prevents ingress of air into the liquid storage chamber. Before use, the end 45 of the adhesive tape 44 is pulled and removed from the nozzle member 15 so that the liquid can be dispensed. Further, in an example shown in Figure 21 (lateral cross section of Figure 15) and in Figure 22 (enlarged cross section showing an essential portion of Figure 21), to minimize the amount of liquid staying above the thin plate member 18, the underside of the crown 16 is provided with a plurality of projections 46; and to enhance the performance of sealing between the nozzle member 15 and the crown 16, a sharp edge portion 47 is formed in the nozzle member 15 and is forced to bite into the crown 16 while being slightly crushed. The means for minimizing the amount of liquid remaining above the thin plate member 18 include the one shown in Figure 23, in which an elastic member 48 such as sponge and foamed urethane is interposed between the crown 16 and the thin plate member 18. Next, an example of construction of the second mode of this invention will be described referring to Figures 24 to 26. Explanations about the portions similar to those of the first mode are omitted. Instead of the thin plate member 18 of the first mode, this made fixes a filmlike member 49 to the dispensing port. Though the filmlike member may be formed into a single layer structure of PET, polyethylene, polyvinyl chloride or nylon, a two-layer structure may be used in which polyethylene or polypropylene is bonded to the underside of the PET. It is also possible to employ a three-layer structure in which PET is joined to the upper side of an aluminum foil and polyethylene is joined to the underside, or in which PET is joined to the upper side of an aluminum foil and polypropylene to the underside. Filmlike members may include a vinylidene chloride-coated PET with polyethylene joined to the underside, a vinylidene chloride-coated PET with polypropylene joined to the underside, a silicon oxide-coated PET with polyethylene joined to the underside, a silicon oxide-coated PET with polypropylene joined to the underside, and a PET with its underside coated with hot-melt resin. Appropriate material may be selected from among these materials depending on the kind of liquid used. Next, how the filmlike member 49 is fixed to the nozzle member 15 will be described. A simple method uses a bonding agent for fixing it. Depending on the kind of liquid, however, the bonding agent may mix with the liquid. Hence, thermal bonding is preferable in which the filmlike member 49 be put on a fixing surface 50 of the nozzle member 15 and subjected to heating or ultrasonic waves to join them together. It is noted that passage 51 for dispensing liquid is not bonded (fixed). A hatched portion 52 of Figures 25 shows a thermally bonded area (fixed part). To enhance the firmness of the thermally bonded portion, the fused surface of the filmlike member 49 may be made of the same material as that of the nozzle member to which it is fixed. When a multiple layer structure, such as two or three-layer structure, is employed, it is preferable that a material with a low melting point be used on the underside. Now, the operation will be explained. In Figure 24, when the crown 16 is depressed, the cylinder 10 slides downwardly in the figure against the resilient force of the elastic body 9, opening the valve 13, which in turn allows the liquid to flow from the inner hole 12 of the cylinder 10 into the liquid passage in the nozzle member 15. The liquid flowing into the liquid passage increases the inner pressure and deforms the filmlike member 49 to open the passage 51, thus establishing the liquid passage, through which the liquid then flows out of a nozzle 53 formed in the nozzle body 14. When the crown 16 is released from the depressing force, the filmlike member 49 recovers to shut off the liquid passage again. At the same time, the resilient force of the elastic body 9 forces the cylinder 10 to slide upward (and return to its original position). At this time, the valve 7 is opened allowing the liquid to move from the inner hole 8 of the piston 5 into the inner hole 12 of the cylinder 10, preparing the next dispensing. The liquid dispensing container of this invention has the above-mentioned constructions. That is, the first mode of the liquid dispensing container has a thin plate member, and the second mode has a film like member. With the above constructions, it is possible to prevent air or external foreign substance from entering the dispensing port and to the interior of the container body, prevent the liquid from drying and keep it sanitary.

Claims: A liquid dispensing container for dispensing liquid from a liquid storage chamber (2) through a dispensing port, comprising: a container body (1) for storing a liquid to be dispensed; a nozzle member (15) connected to the container body (1) and having a nozzle opening (21) for dispensing liquid from the container, and a liquid passage (17) communicating the interior of the container body (1) with the nozzle opening (21); and an elastic member (18) disposed in and surrounded by the nozzle member such that the elastic member (18) normally closes the liquid passage (17); the elastic member having a fixed portion at an inner end thereof and a non-fixed portion at an opposite, outer end thereof, the non-fixed portion allowing throughflow of liquid upon pressure applied to the liquid; characterized in that the elastic member (18) is formed of a thin metal plate which can deflect over a major part of its length to allow throughflow of liquid (49), and in that the outer end of the elastic member (18) is set back from the nozzle opening (21) such that the nozzle opening (21) of the nozzle member (15) functions as the dispensing port for finally dispensing the liquid out of the container body (1). A liquid dispensing container according to claim 1, characterized in that a means is disposed in the nozzle member (15) for limiting the extent of elastic deflection of the elastic member. A liquid dispensing container for dispensing liquid from a liquid storage chamber (2) through a dispensing port, comprising: a container body (1) for storing a liquid to be dispensed; a nozzle member (15) connected to the container body (1) and having a nozzle opening (21) for dispensing liquid from the container, and a liquid passage (17) communicating the interior of the container body (1) with the nozzle opening (21); and an elastic member (18) disposed in and surrounded by the nozzle member such that the elastic member (18) normally closes the liquid passage (17); the elastic member having a fixed portion at least at an inner end thereof and a non-fixed portion at an opposite, outer end thereof, the non-fixed portion allowing throughflow of liquid upon pressure applied to the liquid; characterized in that the elastic member (18) is formed of a film like member (49) bonded to the nozzle member on both its sides as well as at its inner end, and in that the outer end of the elastic member (18) is set back from the nozzle opening (21) such that the nozzle opening (21) of the nozzle member (15) functions as the dispensing port for finally dispensing the liquid out of the container body (1).

Inventors: KUMAMOTO KENICHI, KUROKAWA TAKUMI, USAMI HIDEYUKI, KUROKAWA, TAKUMI, USAMI, HIDEYUKI
Applicants: PENTEL KK, PENTEL KABUSHIKI KAISHA
Application year: 1995
Main classification: B65D47
IPC codes: B05B11, B65D47