Dispenser

Abstract

To provide a discharger in which a nozzle head is easily assembled to a stem and a sink mark of a resin material is hardly generated when the stem is manufactured.SOLUTION: A moving-valve mechanism portion 8 constituted by a cylinder 5, a piston 6, a holding member 7 having a stem 7a and a nozzle head 7b, a moving-valve seated portion 8a, a moving-valve 8b, and a rise restricting portion 8c, an internal flow path C extending from the housing space S to the discharge port C1 through the pump chamber C2 and the moving-valve mechanism portion 8 in this order, and a biasing portion 9, wherein the contents 4 are sent from the pump chamber C1 to the discharge port C2 and discharged by a depressing operation, in the discharger 2 for sucking the content 4 from the storage space S into the pump chamber C1 by releasing the push-down operation, the nozzle head 7b has a rise regulating part 8c and a moving valve-holding part 7a for holding the moving valve-seating part 7b before assembling the nozzle head 8b to the stem 8b and seating the moving valve-seating part 8a on the moving valve-seated part 7b1 with the assembling.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dispenser. [Background technology]

[0002] A dispenser that is attached to the mouth of a container body and dispenses the contents is known, and that has a moving valve mechanism that is composed of a cylinder, a piston, a holding member having a stem and a nozzle head, a moving valve seating portion provided on the stem, and a moving valve and an ascent restriction portion that restricts the ascent of the moving valve by abutting against the moving valve as it rises (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-330000 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the above-described dispenser, when the rise restriction part is provided on the stem, the movable valve can be installed in advance when assembling the nozzle head to the stem, so that the assembly can be carried out while the movable valve is held in place, making assembly easy. However, there are problems such as sink marks (shrinkage during cooling) in the resin material easily occurring in the part where the rise restriction part is provided during the manufacture of the stem.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a dispenser in which the nozzle head can be easily assembled to the stem and in which sink marks in the resin material are less likely to occur during the manufacture of the stem. [Means for solving the problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] A dispenser that is attached to the mouth of a container body having a mouth, a body, and a bottom, connected in this order, and that dispenses contents contained in a storage space of the container body, A cylinder; a piston that slides within the cylinder; a holding member having a stem and a nozzle head; a moving valve mechanism unit including a moving valve seating portion provided on the stem, a moving valve that moves down by its own weight to seat on the moving valve seating portion, and an ascent restriction portion that restricts the ascent of the moving valve by contacting the moving valve as it rises; an internal flow path extending from the accommodation space through a pump chamber defined by the cylinder and the piston and the moving valve mechanism in this order to a discharge port provided in the nozzle head; a biasing portion that generates a biasing force that raises the holding member relative to the cylinder, In a dispenser in which, by a pressing operation to press down the holding member, the holding member, together with the piston, descends relative to the cylinder, thereby sending and discharging the content from the pump chamber to the discharge port, and, by releasing the pressing operation, the holding member, together with the piston, ascends relative to the cylinder, thereby sucking the content from the storage space into the pump chamber, The nozzle head has the rise restriction portion and a moving valve holding portion that holds the moving valve before the nozzle head is assembled to the stem and seats the moving valve on the moving valve seating portion during the assembly.

[0008] [2] the stem has a movable valve seating cylinder having the movable valve seating portion at an upper end thereof, The discharge device described in [1], wherein the movable valve holding portion is pushed radially outward by the movable valve seating cylinder during assembly, thereby releasing the movable valve and seating it on the movable valve seating portion.

[0009] [3] the movable valve holding portion has a plurality of protruding pieces that are arranged at different positions around the movable valve when viewed in the up-down direction and each protrude downward, The dispenser according to [1] or [2], wherein each of the protrusions has a locking portion that hooks the movable valve to restrict its descent.

[0010] [4] the stem is formed of a resin material including polybutylene terephthalate; the nozzle head is formed of a resin material containing polyolefin, The stem has a fitting cylinder at its upper end, the nozzle head has a sealing cylinder that is in close contact with the inner peripheral surface of the fitted cylinder, and a fitting cylinder that is fitted with the outer peripheral surface of the fitted cylinder, The dispenser according to [3], wherein each of the protruding pieces protrudes downward from the sealing tube. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a dispenser in which the nozzle head can be easily assembled to the stem and in which sink marks in the resin material are unlikely to occur during the manufacture of the stem. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a partial cross-sectional side view showing a state before discharging of the dispensing container according to the embodiment of the present invention. [Figure 2] 2 is a partial side cross-sectional view showing a state before a nozzle head is assembled to a stem in the discharger shown in FIG. 1. FIG. [Figure 3] 3 is a partial cross-sectional side view showing a state where the nozzle head has been completely assembled onto the stem, following the state shown in FIG. 2. FIG. [Figure 4] 2 is a cross-sectional view showing a state immediately before the assembly of the moving valve mechanism shown in FIG. 1 is completed. [Figure 5] 5 is a cross-sectional view showing a state when assembly is completed from the state shown in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] As shown in FIG. 1 , in one embodiment of the present invention, a dispensing container 1 includes a dispenser 2 and a container body 3. The container body 3 includes a mouth 3a, a body 3b, and a bottom (not shown), which are connected in this order. The dispenser 2 defines a storage space S for storing contents 4. The dispenser 2 is attached to the mouth 3a of the container body 3 and dispenses the contents 4 stored in the storage space S of the container body 3 in response to operation. In this embodiment, the vertical direction is a direction along a central axis O passing through the center of the mouth 3a, the upward direction is a direction from the bottom to the mouth 3a along the vertical direction, the downward direction is the opposite direction, the radial direction is a direction perpendicular to the central axis O, and the circumferential direction is a direction circumferential around the central axis O. The contents 4 are not particularly limited, and in this embodiment, they are liquids containing oils or the like that swell polyolefins such as polypropylene (PP) and polyethylene (PE). Note that the contents 4 may be liquids that do not contain components that cause such swelling.

[0015] As shown in FIG. 1, the dispenser 2 includes a cylinder 5, a piston 6 that slides within the cylinder 5, a holding member 7 having a stem 7a and a nozzle head 7b, a moving valve mechanism 8 that includes a moving valve seating portion 8a provided on the stem 7a, a moving valve 8b that moves down by its own weight to seat on the moving valve seating portion 8a, and a rise restriction portion 8c that comes into contact with the moving valve 8b as it rises to restrict the rise of the moving valve 8b, and a pump chamber C1 and a moving valve mechanism 8 that are partitioned from the accommodation space S by the cylinder 5 and the piston 6. and a biasing section 9 that generates a biasing force that raises the holding member 7 relative to the cylinder 5, and by pressing down the holding member 7, the holding member 7, together with the piston 6, descends relative to the cylinder 5, sending the contents 4 from the pump chamber C1 to the discharge port C2 and discharging it, and by releasing the pressing down operation, the holding member 7, together with the piston 6, rises relative to the cylinder 5, sucking the contents 4 from the storage space S into the pump chamber C1. The shape of the moving valve 8b is not particularly limited, and in this embodiment it is ball-shaped.

[0016] In consideration of the ease of assembly of the nozzle head 7b and the productivity of the stem 7a, in this embodiment, the moving valve mechanism 8 is configured such that, as shown in FIGS. 2 and 3, the nozzle head 7b has a rise restriction portion 8c and a moving valve holding portion 7b1 that holds the moving valve 8b before the nozzle head 7b is assembled to the stem 7a and seats the moving valve 8b on the moving valve seating portion 8a during assembly. With this configuration, the rise restriction portion 8c is located in the nozzle head 7b rather than the stem 7a, ensuring the productivity of the stem 7a (reducing sink marks). Furthermore, the moving valve holding portion 7b1 provided in the nozzle head 7b prevents the moving valve 8b from unintentionally falling off the stem 7a when the nozzle head 7b is assembled to the stem 7a, achieving stable assembly.

[0017] As shown in Figures 4 and 5, the stem 7a has a movable valve seated cylinder 7a1 with a movable valve seated portion 8a at its upper end, and the movable valve holder 7b1 is pushed outward in the radial direction by the movable valve seated cylinder 7a1 during assembly, thereby releasing the movable valve 8b and seating it on the movable valve seated portion 8a. After assembly is complete, the movable valve seated cylinder 7a1 maintains the state in which the movable valve holder portion 7b1 is pushed outward in the radial direction. With this configuration, the outer periphery of the movable valve 8b can be configured to seat on the movable valve seated portion 8a when viewed in the vertical direction, making it easier to ensure the flow path cross-sectional area of ​​the internal flow path C in the portion passing through the moving valve seated portion 8a.

[0018] More specifically, the moving valve holding portion 7b1 has multiple (three in this embodiment) protruding pieces 7b2 that are positioned at different positions around the moving valve 8b (circumferential direction) when viewed in the vertical direction and each protruding downward. Each protruding piece 7b2 has a locking portion 7b3 that hooks onto the moving valve 8b to prevent it from descending. The locking portion 7b3 is formed by a convex portion that protrudes radially inward at the lower end of the protruding piece 7b2. During assembly, the lower end of the convex portion is pushed radially outward by the moving valve seating cylinder 7a1, thereby expanding the moving valve holding portion 7b1 radially outward. Note that for this reason, the lower end of the convex portion is formed by an inclined surface that slopes radially outward as it extends downward. However, this is not limited to this, and such an inclined surface may also be provided at the upper end of the moving valve seating cylinder 7a1.

[0019] In this embodiment, the retaining member 7 has a piston guide 7c integrally attached to the inner circumferential surface of the stem 7a, the piston guide 7c having a piston seating portion 7c1, and the piston 6 moves up relative to the piston seating portion 7c1 to separate from the piston seating portion 7c1 and open the internal flow path C. The dispenser 2 is held within the pump chamber C1 so as to move up and down within a predetermined range, and has a poppet valve 10 that closes the upstream end of the pump chamber C1 when it moves down and opens the upstream end of the pump chamber C1 when it moves up, and the poppet valve 10 has a rod portion 10a with an outer peripheral surface that slides the piston guide 7c up and down, and when the piston guide 7c moves down by a pressing operation, the poppet valve 10 moves down due to the frictional force between the piston guide 7c and the rod portion 10a, and when the piston guide 7c moves up by releasing the pressing operation, the poppet valve 10 moves up due to the frictional force between the piston guide 7c and the rod portion 10a.

[0020] In this embodiment, as a countermeasure against swelling, the stem 7a, cylinder 5, and poppet valve 10 are each formed of a resin material other than polyolefin. Examples of such resin materials that are less likely to swell include resin materials containing polybutylene terephthalate (PBT). The piston guide 7c is formed of a resin material containing polyolefin (high-density polyethylene (HDPE) in this embodiment), and the piston 6 is formed of a resin material containing polyolefin (low-density polyethylene (LDPE) in this embodiment).

[0021] If the stem 7a is made of a resin material other than polyolefin (especially a resin material containing PBT), providing the rise regulating portion 8c on the stem 7a makes it difficult to achieve dimensional accuracy, and the material becomes hard, making it difficult to fit the moving valve 8b into the stem 7a.

[0022] In this embodiment, the nozzle head 7b is formed from a resin material containing polyolefin (PP in this embodiment), the stem 7a has a fitted tube 7a2 at its upper end, the nozzle head 7b has a sealing tube 7b4 that is in close contact with the inner peripheral surface of the fitted tube 7a2, and a fitting tube 7b5 that fits into the outer peripheral surface of the fitted tube 7a2, and each protrusion 7b2 protrudes downward from the lower end of the sealing tube 7b4. With this configuration, even when the nozzle head 7b swells, the seal between the nozzle head 7b and the stem 7a can be ensured, and the contents 4 can be prevented from leaking out of the internal flow path C.

[0023] The cylinder 5 has a cylinder body 5a that slides the piston 6 and a flange 5b that extends radially outward from the cylinder body 5a, and the dispenser 2 has an attachment cap 11 that has a locking tube 11a that locks onto the outer circumferential surface of the mouth portion 3a and a flange presser portion 11b that continues to the upper end of the locking tube 11a, and the flange 5b is sandwiched and held between the mouth portion 3a and the flange presser portion 11b. Note that the dispenser 2 has an overcap 12 in this embodiment, but is not limited to this.

[0024] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Explanation of symbols]

[0025] 1 Discharge container 2 Dispenser 3 Container body 3a Mouth 3b Torso 4 Contents 5 cylinders 5a Cylinder body 5b flange 6 pistons 7 Retaining member 7a stem 7a1 Moving valve seating cylinder 7a2 Mated cylinder 7b Nozzle head 7b1 Moving valve holder 7b2 Projection piece 7b3 Locking part 7b4 Seal tube 7b5 Mating tube 7c Piston guide 7c1 Piston seating part 8 Moving valve mechanism 8a Moving valve seating part 8b Transfer valve 8c Rise control section 9. Actuating section 10 Poppet valve 10a Rod part 11 Mounting cap 11a Locking tube 11b Flange holder 12 Overcap C Internal flow path C1 Pump Room C2 outlet O center axis S Storage space

Claims

1. A dispenser that is attached to the mouth of a container body having a mouth, a body, and a bottom, connected in this order, and that dispenses contents contained in a storage space of the container body, A cylinder; a piston that slides within the cylinder; a holding member having a stem and a nozzle head; a moving valve mechanism unit including a moving valve seating portion provided on the stem, a moving valve that moves down by its own weight to seat on the moving valve seating portion, and an ascent restriction portion that restricts the ascent of the moving valve by contacting the moving valve as it rises; an internal flow path extending from the accommodation space through a pump chamber defined by the cylinder and the piston and the moving valve mechanism in this order to a discharge port provided in the nozzle head; a biasing portion that generates a biasing force that raises the holding member relative to the cylinder, In a dispenser in which, by a pressing operation to press down the holding member, the holding member, together with the piston, descends relative to the cylinder, thereby sending and discharging the content from the pump chamber to the discharge port, and, by releasing the pressing operation, the holding member, together with the piston, ascends relative to the cylinder, thereby sucking the content from the storage space into the pump chamber, The nozzle head has the rise restriction portion and a moving valve holding portion that holds the moving valve before the nozzle head is assembled to the stem and seats the moving valve on the moving valve seating portion during the assembly.

2. the stem has a movable valve seating cylinder having the movable valve seating portion at an upper end thereof, The discharger according to claim 1 , wherein the movable valve holding portion is pushed radially outward by the movable valve seating cylinder during assembly, thereby releasing the movable valve and seating it on the movable valve seating portion.

3. the movable valve holding portion has a plurality of protruding pieces that are arranged at different positions around the movable valve when viewed in the up-down direction and each protrude downward, The dispenser according to claim 1 , wherein each of the protruding pieces has a locking portion that catches the movable valve and restricts its downward movement.

4. the stem is formed of a resin material including polybutylene terephthalate; the nozzle head is formed of a resin material containing polyolefin, The stem has a fitting cylinder at its upper end, the nozzle head has a sealing cylinder that is in close contact with the inner peripheral surface of the fitted cylinder, and a fitting cylinder that is fitted with the outer peripheral surface of the fitted cylinder, The dispenser according to claim 3 , wherein each of the protruding pieces protrudes downward from the sealing tube.

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