Liquid dispenser

Abstract

To provide a novel liquid dispenser in which a pump is unlikely to come off a base cap even if a force in a gouging direction is applied to the pump.SOLUTION: A liquid dispenser 100 of the present disclosure includes a base cap 1 having a cylindrical outer wall 1b with a female threaded portion 1bf that threadably engages with a container body C and attached to a mouth portion C2, a pump suspended from the mouth portion C2 of the container body C by the base cap 1, and a nozzle head 14 that dispenses liquid content to the outside. The liquid dispenser 100 is configured such that a cylindrical cylinder 4 is provided with a flange 4g extending radially outward, the cylinder 4 is attached to the base cap 1 by engaging a radially outer end of the flange 4g with an engagement protrusion 1h that protrudes radially inward from the inner surface of the outer wall 1b of the base cap 1, the engagement protrusion 1h has a plurality of helical protrusions 1h1 that draw a helical shape downward from a plurality of circumferential positions, and the helical shape has an inclination angle equal to that of the female threaded portion 1bf.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a liquid ejector that ejects a liquid content. [Background technology]

[0002] Containers filled with shampoo, body soap, hand soap, facial cleanser, etc. are often equipped with a liquid dispenser that can operate a pump by pressing a nozzle head to dispense the liquid contained in the container, in order to make the content liquid easier to use.

[0003] In such a liquid dispenser, a cylinder with a piston that draws in, pressurizes, and pumps the liquid content is attached to a base cap that is held at the mouth of a container. By pressing the nozzle head to drive the piston in the pump, the liquid content is drawn into the cylinder, pressurized, and pumped, and then dispensed from the nozzle (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-67354 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the liquid dispenser shown in Patent Document 1, the pump is held in the base cap by undercut engagement of a flange extending radially outward from the upper end of a cylinder constituting the pump with an annular protrusion provided on the inner surface of the base cap. However, when a force that gouges the pump (a force in a direction that tilts the pump with the base cap as a fulcrum) is applied to the liquid dispenser before it is attached to the container body, a strong pulling force is applied in the circumferential direction of a portion of the undercut engagement between the pump and the base cap, and the pump comes off the base cap more easily than if it were pulled in the axial direction.

[0006] The undercut engagement between the pump and the base cap described above can be strengthened by increasing the radial height of the annular protrusion on the base cap side, but since the annular protrusion is formed by forcibly removing the die, increasing the radial height may cause the annular protrusion to be plastically deformed during the forcible removal. Therefore, there is a limit to how much the radial height of the annular protrusion can be increased.

[0007] An object of the present disclosure is to provide a new liquid dispenser in which the pump is unlikely to come off the base cap even when a force is applied to the pump in a gouging direction. [Means for solving the problem]

[0008] In order to solve the above problems, the liquid ejector of the present disclosure comprises: [1] a base cap having a cylindrical outer wall with a female thread portion that threadably engages with a male thread portion provided at the mouth of the container body and is attached to the mouth; a pump that is suspended from the mouth of the container body by the base cap and that draws in, pressurizes, and pumps the liquid contained therein; A liquid dispenser including a nozzle head for discharging the liquid content to the outside through an internal passage, A cylindrical cylinder defining the outer shape of the pump is provided with a flange extending radially outward from an upper portion thereof, and the cylinder is attached to the base cap by engaging a radially outer end of the flange with an engaging projection protruding radially inward from an inner surface above the female threaded portion of the outer wall of the base cap, The engaging projection has a plurality of helical projections that form a spiral shape downward from a plurality of circumferential positions at an upper end of the engaging projection, and the helical shape has an inclination angle equal to that of the female thread portion.

[0009] The liquid ejector of the present disclosure further comprises: [2] In the configuration described in [1] above, it is preferable that the multiple helical projections do not overlap with each other in the circumferential direction. Effect of the Invention

[0010] According to the present disclosure, it is possible to provide a new liquid dispenser in which the pump is unlikely to come off the base cap even when a force in a gouging direction is applied to the pump. [Brief description of the drawings]

[0011] [Figure 1] 1 is a front cross-sectional view showing one embodiment of a liquid dispenser according to the present disclosure, the liquid dispenser being attached to the mouth of a container body. [Diagram 2] FIG. 2 is a detailed view of part A in FIG. [Diagram 3] FIG. 13 is a front cross-sectional view of a base cap showing an example in which two helical protrusions are provided on the inner surface of the base cap. [Figure 4] FIG. 13 is a bottom view of a base cap showing an example in which two spiral protrusions are provided on the inner surface of the base cap. [Diagram 5] FIG. 13 is a front cross-sectional view of a base cap showing an example in which four helical protrusions are provided on the inner surface of the base cap. [Figure 6] FIG. 13 is a bottom view of a base cap showing an example in which four spiral protrusions are provided on the inner surface of the base cap. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the liquid dispenser 100 according to the present disclosure will be described in detail with reference to the drawings (FIGS. 1 to 6). FIG. 1 is a front cross-sectional view showing an embodiment of the liquid dispenser 100 according to the present disclosure attached to the mouth part C2 of the container body C. In this embodiment, the liquid dispenser 100 includes a base cap 1 attached to the mouth part C2 of the container body C, a pump (in this embodiment, including a pump 2 for the content liquid and a pump 3 for the air) that is suspended and held at the mouth part C2 of the container body C by the base cap 1 and that sucks, pressurizes, and pumps the content liquid and air, respectively, a jet ring 13 that forms a joining space G where the content liquid and air pressure-fed from the pump join together and that holds a mesh ring 12 that foams the mixed content liquid and air, and a nozzle head 14 that ejects the foamed content liquid to the outside through an internal passage 14a.

[0013] The liquid dispenser 100 disclosed herein includes not only dispensers, like the liquid dispenser 100 according to the present embodiment, which individually suck in, pressurize, and pump the liquid contents and air in the container body C, and then mix the liquid contents and air in the merging space G to form bubbles and dispense them to the outside, but also dispensers that do not have an air pump and are composed only of a pump for the liquid contents, and which dispense only the liquid contents from the nozzle head to the outside.

[0014] In this specification, claims, and drawings, the up-down direction means the upper and lower directions when the liquid dispenser 100 is attached to the container body C and in an upright position as shown in Fig. 1. The radially outward direction means the direction away from the central axis O along a straight line that passes through the central axis O of the liquid dispenser 100 in Fig. 1 and is perpendicular to the central axis O, and the radially inward direction means the direction toward the central axis O along that straight line.

[0015] The configuration, shape, dimensional ratio, etc. of the liquid ejector 100 in the accompanying drawings are merely one embodiment of the present disclosure. The present invention should be interpreted based on the wording of the claims, and is not limited to the configuration, shape, dimensional ratio, etc. shown in the drawings.

[0016] In FIG. 1, reference numeral 1 denotes a base cap that is attached to the mouth C2 of the container body C. The base cap 1 has an outer wall 1b that hangs down from the edge of the top wall 1a, and is detachably attached by threadingly engaging a female thread 1bf provided on the inside of the outer wall 1b with a male thread C2m provided on the mouth C2 of the container body C. A hollow neck 1c that stands upward is provided at the center of the top wall 1a. A rib 1e that extends in the vertical direction is provided on the inner peripheral surface of the hollow neck 1c. Furthermore, a through hole 1f that penetrates the top wall 1a and leads to the inside of the container is formed on the inside of the hollow neck 1c.

[0017] Reference numerals 2 and 3 denote two pumps that are suspended from the mouth of the container body C by the base cap 1 and that suck, pressurize, and pump out the liquid and air, respectively. The liquid pump 2 and the air pump 3 are formed by a single cylinder 4, which is a cylinder having a small diameter cylinder 4a and a large diameter cylinder 4b, the bottom of which is integrally connected to the top of the small diameter cylinder 4a, arranged in series on the same axis. The small diameter cylinder 4a constitutes a part of the liquid pump 2, and the large diameter cylinder 4b constitutes a part of the air pump 3. A flange 4g is provided on the top of the cylinder 4, which extends radially outward. When the cylinder 4 is suspended from the container body C, a packing PA is provided on the underside of the flange 4g, and the flange 4g and the packing PA are sandwiched between the top wall 1a of the base cap 1 and the mouth of the container body C.

[0018] In this embodiment, the radially outer end of the flange 4g is configured to undercut-engage with an engagement protrusion 1h provided above the female thread portion 1bf on the inner surface of the outer wall 1b of the base cap 1. With this configuration, the cylinder 4 can be maintained attached to the base cap 1 even when the base cap 1 is removed from the mouth portion C2 of the container body C. Therefore, the container body C filled with the liquid content and the liquid dispenser 100 can be handled separately, making it easier to propose various uses such as refilling the liquid content and reusing the liquid dispenser 100.

[0019] In this embodiment, the engagement protrusion 1h is provided above the female thread portion 1bf on the outer wall 1b of the base cap 1, as shown in Figs. 1 and 2. The engagement protrusion 1h protrudes radially inward from the female thread portion 1bf as shown in Figs. 2 to 6, and is provided directly below the fitting portion 1g (see Fig. 2) into which the radial outer end of the flange 4g of the cylinder 4 fits. That is, the engagement protrusion 1h is formed on the inner surface of the outer wall 1b, and the area directly above the engagement protrusion 1h functions as the fitting portion 1g. In Fig. 2, the radial outer end of the flange 4g of the cylinder 4 is undercut-engaged with the engagement protrusion 1h provided on the inner surface of the outer wall 1b of the base cap 1, and is fitted into the fitting portion 1g provided directly above the engagement protrusion 1h. That is, the engagement protrusion 1h supports the flange 4g from below.

[0020] As shown in Figures 3 to 6, the engagement projection 1h has a spiral shape with the same inclination angle as the female thread portion 1bf, and has a plurality of spiral projections 1h1 that draw a spiral shape downward from multiple circumferential positions at the upper end of the engagement projection 1h.

[0021] 3 and 4 show an example in which the engagement projection 1h has two helical projections 1h1. As shown in FIG. 3, the two helical projections 1h1 have the same inclination angle as the female thread portion 1bf provided on the inner surface of the outer wall 1b of the base cap 1, and form a helical shape downward from a plurality of circumferential positions 1j1, 1j2 at the upper end of the engagement projection 1h. In the example shown in FIG. 3 and 4, the two helical projections 1h1 form a helical shape downward from two circumferential positions 1j1, 1j2 that face each other and are 180 degrees apart in the circumferential direction.

[0022] With this configuration, when the base cap 1 is formed by injection molding or the like, when the core-side mold forming the inside of the outer wall 1b is removed downward in FIG. 3, it is moved downward while rotating around the central axis O in accordance with the inclination angle of the female thread portion 1bf. This allows the core-side mold to be removed downward without forcibly removing the female thread portion 1bf and without dividing the core-side mold into multiple parts. In this embodiment, the inclination angle of the multiple spiral projections 1h1 provided above the female thread portion 1bf is also set to the same as the inclination angle of the female thread portion 1bf (the distance that the thread portion advances in the vertical direction when rotated by a predetermined angle around the central axis O is set to be the same). With this configuration, when the core-side mold is removed from the base cap 1, it is moved downward while rotating around the central axis O so as not to forcibly remove the female thread portion 1bf, and the core-side mold can be removed without applying a large load that would forcefully remove the engagement projection 1h to the mold portion that forms the engagement projection 1h in the core-side mold.

[0023] Furthermore, in this embodiment, multiple (two in the example shown in Figures 3 and 4) helical protrusions 1h1 are provided, so the cylinder 4 can be stably supported at two circumferential points by the two helical protrusions 1h1, rather than by arranging only one helical protrusion 1h1 and supporting it at one circumferential point at the upper end of the engagement protrusion 1h, and the engagement force of the undercut engagement can be improved.

[0024] Furthermore, by providing a plurality of (two) helical projections 1h1, it is possible to arrange a thicker (wider in the vertical direction in FIG. 2) helical projection 1h1 within the height region in which the engagement projection 1h can be arranged, and therefore the height (diameter height, i.e., left-right height in FIG. 2) of the helical projection 1h1 can also be increased. Therefore, the engagement force of the undercut engagement between the flange 4g and the engagement projection 1h can be increased.

[0025] In this embodiment, the two spiral projections 1h1 are arranged so as not to overlap each other in the circumferential direction. That is, the two spiral projections 1h1 do not overlap in the vertical direction. More specifically, one spiral projection 1h1 starts from a circumferential position 1j1 (see Figs. 3 and 4) at the upper end of the engagement projection 1h, describes a spiral shape, and ends at a circumferential position 1j2. The other spiral projection 1h1 starts from a circumferential position 1j2 at the upper end of the engagement projection 1h, describes a spiral shape, and ends at a circumferential position 1j1.

[0026] With this configuration, the two helical projections 1h1 do not overlap each other in the circumferential direction, so there is no interference with the other helical projections 1h1 in the height direction (vertical direction in FIG. 2), and it is easy to increase the thickness (width in the vertical direction in FIG. 2) of each helical projection 1h1. Therefore, the height (radial height, i.e., height in the horizontal direction in FIG. 2) of the helical projection 1h1 can be increased, so that the engagement force of the undercut engagement between the flange 4g and the engagement projection 1h can be increased.

[0027] In the example of Fig. 3 and Fig. 4, the two spiral projections 1h1 are arranged so as not to overlap each other at all in the circumferential direction, but this is not limited to the embodiment. Since overlapping with other spiral projections 1h1 can be suppressed by gradually decreasing the thickness (width in the vertical direction in Fig. 2) and height (height in the horizontal direction in Fig. 2) of the start point (upper end of the spiral projection 1h1) and end point (lower end of the spiral projection 1h1) of each spiral projection 1h1, the start point and end point of each spiral projection 1h1 may overlap in the circumferential direction. In addition, it is preferable that the start points (upper end) of the multiple spiral projections 1h1 are positioned in the same vertical direction on the outer wall 1b, and it is more preferable that the start points (upper end) and end points (lower end) are positioned in the same vertical direction.

[0028] 5 and 6 show an example in which the engagement protrusion 1h has four helical protrusions 1h1. As shown in FIG. 5, the four helical protrusions 1h1 have the same inclination angle as the female thread portion 1bf provided on the inner surface of the outer wall 1b of the base cap 1, and form a helical shape downward from a plurality of circumferential positions 1j3, 1j4, 1j5, and 1j6 at the upper end of the engagement protrusion 1h. In the example shown in FIG. 5 and 6, the four helical protrusions 1h1 form a helical shape downward from four circumferential positions equally spaced at 90° intervals in the circumferential direction.

[0029] With this configuration, when the core side mold is removed from the base cap 1, it is rotated about the central axis O and moved downward so as not to forcibly remove the female thread portion 1bf, and thus the core side mold can be removed without applying a large load to the mold portion that forms the engaging protrusion 1h in the core side mold that would forcibly remove the engaging protrusion 1h.

[0030] Furthermore, in this embodiment, multiple (four in the example shown in Figures 5 and 6) helical protrusions 1h1 are provided, so that the cylinder 4 can be stably supported at four circumferential points by the four helical protrusions 1h1, rather than by arranging only one helical protrusion 1h1 and supporting it at one circumferential point at the upper end of the engagement protrusion 1h, and the engagement force of the undercut engagement can be improved.

[0031] Furthermore, by providing a plurality of (four) helical projections 1h1, it is possible to arrange a thicker (wider in the vertical direction in FIG. 2) helical projection 1h1 within the height region in which the engagement projection 1h can be arranged, and therefore it is possible to increase the height (diameter height, i.e., left-right height in FIG. 2) of the helical projection 1h1. This makes it possible to further increase the engagement force of the undercut engagement between the flange 4g and the engagement projection 1h.

[0032] In this embodiment, the four spiral projections 1h1 are arranged so as not to overlap each other in the circumferential direction. More specifically, one spiral projection 1h1 starts from a circumferential position 1j3 at the upper end of the engagement projection 1h, draws a spiral shape, and ends at a circumferential position 1j6. Another spiral projection 1h1 starts from a circumferential position 1j6 at the upper end of the engagement projection 1h, draws a spiral shape, and ends at a circumferential position 1j5. Yet another spiral projection 1h1 starts from a circumferential position 1j5 at the upper end of the engagement projection 1h, draws a spiral shape, and ends at a circumferential position 1j4. Yet another spiral projection 1h1 starts from a circumferential position 1j4 at the upper end of the engagement projection 1h, draws a spiral shape, and ends at a circumferential position 1j3.

[0033] With this configuration, the four helical projections 1h1 do not overlap each other in the circumferential direction, so there is no interference with the other helical projections 1h1 in the height direction (vertical direction in FIG. 2), and it is easy to increase the thickness (vertical width in FIG. 2) of each helical projection 1h1. Therefore, the height of the helical projection 1h1 (radial height, i.e., horizontal height in FIG. 2) can be increased, so that the engagement force of the undercut engagement between the flange 4g and the engagement projection 1h can be increased.

[0034] 5 and 6, the four spiral projections 1h1 are arranged so as not to overlap each other at all in the circumferential direction, but this is not limited to the embodiment. By gradually decreasing the width (width in the vertical direction in FIG. 2) and height (height in the horizontal direction in FIG. 2) of the start point and end point of each spiral projection 1h1, overlapping with other spiral projections 1h1 can be suppressed, so the start point and end point of each spiral projection 1h1 may overlap in the circumferential direction.

[0035] 3 to 6, the cases where there are two and four spiral projections 1h1 have been described, but the present invention is not limited to these embodiments. The number of spiral projections 1h1 may be an odd number, as long as there are two or more. In addition, it is preferable that the starting points of the multiple spiral projections 1h1 at the upper end of the engagement projection 1h are arranged at approximately equal intervals in the circumferential direction, but the present invention is not limited to this.

[0036] The liquid pump 2 has a suction port 4c at the bottom of the small diameter cylinder 4a, through which the liquid in the storage space S of the container body C flows in. A fitting cylinder 4d is provided at the edge of the suction port 4c to fit and hold a suction pipe p extending toward the bottom of the container body C. A hollow piston 5 is provided in the small diameter cylinder 4a, which abuts against the inner peripheral surface of the small diameter cylinder 4a and is slidable along its axis, and a seal portion 5b is provided at the bottom of the hollow piston 5. A poppet 6 is provided in an internal passage t1 formed inside the hollow piston 5. Here, the upper portion of the hollow piston 5 forms a reduced diameter portion 5a whose inner surface is reduced in diameter. The poppet 6 has a valve portion 6a at its lower end for opening and closing the suction port 4c, and a valve portion 6b at its upper end for opening and closing the outlet of the internal passage t1. A piston guide 9 is attached to the outside of the hollow piston 5. The piston guide 9 is provided with a cylindrical wall 9a surrounding the hollow piston 5, an inward flange 9g extending radially inward at the upper part of the cylindrical wall 9a and having its inner end extending up and down, and an intermediate flange 9b extending radially outward at approximately the center height position of the cylindrical wall 9a. An inner passage t2 communicating with the internal passage t1 is formed inside the upper part of the cylindrical wall 9a. A spring 8 is disposed between the lower part of the poppet 6 and the upper part of the hollow piston 5. As a result, the hollow piston 5 and the piston guide 9 are elastically supported as a unit so as to be slidable within the cylinder 4 relative to the poppet 6.

[0037] The upper part of the cylindrical wall 9a of the piston guide 9 also functions as a stem extending from the cylinder 4 of the pump, and a nozzle head 14 is attached via a jet ring 13.

[0038] As shown in Fig. 1, a ball valve B is disposed above the inward flange 9g, with the upper surface of the inward flange 9g serving as a valve seat, for opening and closing a valve opening 9g1. The ball valve B is configured to be prevented from slipping out upward by a cover portion 7g provided on the cover member 7. The cover member 7 has a side opening 7g1 that allows the content liquid to pass through a cylindrical column 7a on the side.

[0039] 1, the upper outer surface of the piston guide 9 is fitted and fixed to the inner surface of the jet ring 13. The jet ring 13 includes a lower cylindrical wall 13a that surrounds the piston guide 9, a reduced diameter portion 13b that is integrally connected to the upper part of the lower cylindrical wall 13a, and an upper cylindrical portion 13c that stands from the reduced diameter portion 13b and protrudes from the through hole 1f of the base cap 1.

[0040] 1, the intermediate flange 9b protrudes radially outward from a contact portion of the cylindrical wall 9a of the piston guide 9 with the reduced diameter portion 5a of the hollow piston 5. The intermediate flange 9b is provided with an intermediate annular wall 9d standing upright from its upper surface. As a result, a recessed space S1 that is open upward is defined by the outer circumferential surface of the cylindrical wall 9a, the intermediate flange 9b, and the intermediate annular wall 9d.

[0041] As shown in FIG. 1, the air pump 3 includes an air piston 10 that contacts the inner peripheral surface of the large-diameter cylinder 4b and is slidable along its axis. A cylindrical guide 10a is provided on the radially inner side of the air piston 10, surrounding the cylindrical wall 9a. As shown in FIG. 1, a gap formed between the outer peripheral surface of the cylindrical wall 9a and the inner peripheral surface of the cylindrical guide 10a is a first air passage A1 that allows air to pass and is located above the recessed space S1. In addition, in the initial position, the lower end of the cylindrical guide 10a is configured to contact at least one of the intermediate flange 9b and the intermediate annular wall 9d. As described later, the cylindrical wall 9a is slightly slidable relative to the air piston 10, and functions as a valve that opens and closes the first air passage A1 by contacting and separating the lower end of the cylindrical guide 10a with the intermediate flange 9b or the intermediate annular wall 9d. In addition, a partition wall 10c that extends radially outward from the cylindrical guide 10a and forms a space between the cylindrical guide 10a and the large-diameter cylindrical body 4b for pressurizing air is provided with an opening 10d for introducing air into the large-diameter cylindrical body 4b. An outside air introduction valve 11 that controls the flow of air into and out of the large-diameter cylindrical body 4b is provided immediately below the opening 10d. The outside air introduction valve 11 includes a valve body 11a having an annular thin wall shape and a valve base 11b that is integrally provided with the valve body 11a. The cylindrical guide 10a forms a seal by sliding against the lower end of the lower cylindrical wall 13a that hangs down from below the reduced diameter portion 13b of the jet ring 13, and connects the first air passage A1 to the second air passage A2 formed inside the lower cylindrical wall 13a.

[0042] 1, a nozzle head 14 is provided above the jet ring 13. The nozzle head 14 foams the mixed liquid and air using a foaming member (mesh ring 12) provided inside the jet ring 13, and ejects the foam to the outside through an internal passage 14a. The nozzle head 14 of this embodiment is attached to the jet ring 13 by fitting an upper cylindrical portion 13c of the jet ring 13 into the inside of an internal cylindrical wall 14d.

[0043] The mesh ring 12 of this embodiment has a mesh 12a attached to one end of a ring-shaped main body. In this embodiment, a total of two mesh rings 12 are attached to the inner surface of the jet ring 13 with the mesh 12a facing outward (the side without the mesh 12a forms the seam).

[0044] The jet ring 13 also has a reduced diameter portion 13b that covers the cover member 7 from above and supports the mesh ring 12 from below. A merging space G of the liquid content from the inner passage t2 and the air flowing in from the second air passage A2 is formed between the cover portion 13g and the reduced diameter portion 13b. A communication groove 13h that communicates the second air passage A2 with the merging space G is formed on the lower surface of the reduced diameter portion 13b. Furthermore, an upper tube portion 13c that surrounds and holds the mesh ring 12 is provided above the reduced diameter portion 13b.

[0045] As shown in FIG. 1, the nozzle head 14 includes a nozzle head main body portion 14b having an internal passage 14a for allowing the flow of the liquid contents, and a head ring 14c that is positioned radially outside the hollow neck portion 1c of the base cap 1 when the pressing portion 14f of the nozzle head 14 is pressed down.

[0046] The nozzle head body 14b is provided on its inner surface with an internal cylindrical wall 14d that fits and holds the upper cylindrical portion 13c, and a rib 14e that prevents the mesh ring 12 attached to the jet ring 13 from slipping out upward. Furthermore, an edge wall 14g that surrounds the upper portion of the head ring 14c is provided on the outer edge of the nozzle head body 14b.

[0047] A stopper 15 for preventing the nozzle head 14 from being inadvertently pressed down may be provided between the top wall 1a of the base cap 1 and the head ring 14c. The stopper 15 is, for example, substantially C-shaped in a plan view, and can be detachably attached from the side of the hollow neck portion 1c.

[0048] In the liquid dispenser 100 thus constructed, when the stopper 15 is removed and the pressing portion 14f of the nozzle head 14 is pressed, the jet ring 13 and the piston guide 9 slide slightly downward relative to the air piston 10 by the vertical distance between the upper portion of the cylindrical guide 10a and the step portion 13d of the lower cylindrical wall 13a. In other words, the sliding of the air piston 10 starts slightly later than the sliding of the piston guide 9.

[0049] When the nozzle head 14 is pressed down, the piston guide 9 is also displaced downward, but as described above, the air piston 10 displaces downward slightly later than the piston guide 9, so the lower end of the cylindrical guide 10a separates from the intermediate flange 9b, and the inside of the air piston 10 communicates with the first air passage A1. When the nozzle head 14 is pressed down further, the air piston 10 moves, and the pressurized air inside the air piston 10 is introduced from the first air passage A1 to the second air passage A2, and flows toward the junction space G via the communication groove 13h.

[0050] On the other hand, in the small diameter cylinder 4a, when the piston guide 9 and hollow piston 5 move downward by pushing down the nozzle head 14, the valve portion 6a of the poppet 6 comes into contact with the inner surface of the small diameter cylinder 4a, the suction port 4c closes, and the inside of the small diameter cylinder 4a is pressurized, and further pushing in of the nozzle head 14 separates the valve portion 6b of the poppet 6 from the outlet of the internal passage t1 in the hollow piston 5, and the liquid present in the internal passage t1 is pressure-fed into the inner passage t2 of the piston guide 9. Then, the internal pressure in the inner passage t2 separates the ball valve B upward from the inward flange 9g and opens the valve, so that the pressure-fed liquid flows into the merging space G.

[0051] The liquid content, which has become a gas-liquid mixture in the merging space G, passes through the mesh ring 12, turns into bubbles, and is discharged to the outside through the internal passage 14a of the nozzle head 14.

[0052] When the pushing force is removed after the nozzle head 14 has been pushed all the way, the hollow piston 5, the piston guide 9 and the nozzle head 14 return to their initial height positions due to the repulsive force of the spring 8.

[0053] During this return process, the poppet 6 moves in accordance with the upward sliding of the hollow piston 5, opening the suction port 4c of the small diameter cylinder 4a, and the ball valve B seats on the inward flange 9g, creating negative pressure inside the small diameter cylinder 4a, and the content liquid in the container body C is sucked into the small diameter cylinder 4a through the suction port 4c.

[0054] On the other hand, in the large-diameter cylinder 4b, the air piston 10 starts to slide upward later than the hollow piston 5 and the piston guide 9. That is, the air piston 10 starts to slide in the first air passage A1 after the lower end of the cylindrical guide 10a abuts against the intermediate flange 9b and is closed. Therefore, when the air piston 10 starts to slide upward, the inside of the air piston 10 (the area below the partition wall 10c in the large-diameter cylinder 4b) becomes negative pressure, so that the valve body 11a of the outside air introduction valve 11 separates from the partition wall 10c to open the valve, and air flows into the inside of the air piston 10 through the gap between the head ring 14c and the inner cylindrical wall 14d, the inside of the hollow neck portion 1c of the base cap 1, and the opening 10d. Also, as the content liquid is sucked into the small-diameter cylinder 4a, outside air is taken into the container body C through the outside air introduction hole 4e provided in the large-diameter cylinder 4b. Further, although not shown, a structure in which air is taken into the air pump 3 may be provided with a radially penetrating opening in the upper part of the head ring 14c.

[0055] By repeatedly pressing the nozzle head 14 and returning it to its initial position in this manner, the liquid content within the container body C can be turned into bubbles and discharged continuously.

[0056] As described above, this embodiment is a liquid dispenser 100 including a cylindrical outer wall 1b having a female threaded portion 1bf that threadably engages with a male threaded portion C2m provided on a mouth portion C2 of a container body C and a base cap 1 that is attached to the mouth portion C2, a pump that is suspended from the mouth portion C2 of the container body C by the base cap 1 and sucks, pressurizes, and pumps the content liquid, and a nozzle head 14 that discharges the content liquid to the outside through an internal passage 14a. A cylindrical cylinder 4 that defines the outer shape of the pump is provided with a flange 4g that extends radially outward from the upper portion, and the cylinder 4 is attached to the base cap 1 by engaging a radially outer end of the flange 4g with an engagement protrusion 1h that protrudes radially inward from an inner surface above the female threaded portion 1bf on the outer wall 1b of the base cap 1, and the engagement protrusion 1h has a plurality of spiral protrusions 1h1 that draw a spiral shape downward from a plurality of circumferential positions at the upper end of the engagement protrusion 1h, and the spiral shape is configured to have an inclination angle equal to that of the female threaded portion 1bf. By adopting such a configuration, when the core-side mold is removed from the base cap 1, it is moved downward while rotating around the central axis O so as not to forcibly remove the female thread portion 1bf, and the core-side mold can be removed without applying a large load that would forcefully remove the engagement protrusion 1h to the mold portion that forms the engagement protrusion 1h in the core-side mold. In addition, since multiple spiral protrusions 1h1 are provided, the cylinder 4 can be stably supported at multiple points in the circumferential direction by multiple spiral protrusions 1h1, and the engagement force of the undercut engagement can be improved, compared to arranging only one spiral protrusion 1h1 and supporting it at one point in the circumferential direction at the upper end of the engagement protrusion 1h. Furthermore, by providing multiple spiral protrusions 1h1, it is possible to arrange a thicker (wider in the vertical direction in FIG. 2) spiral protrusion 1h1 within the height region where the engagement protrusion 1h can be arranged, so the height of the spiral protrusion 1h1 (height in the radial direction, i.e., height in the horizontal direction in FIG. 2) can be increased. Therefore, the engagement force of the undercut engagement between the flange 4g and the engagement protrusion 1h can be increased.

[0057] In this embodiment, the multiple helical protrusions 1h1 are configured so as not to overlap each other in the circumferential direction. By adopting such a configuration, interference with other helical protrusions 1h1 in the height direction (vertical direction in FIG. 2) does not occur, and it is easy to increase the thickness (width in the vertical direction in FIG. 2) of each helical protrusion 1h1. Therefore, the height of the helical protrusion 1h1 (radial height, i.e., height in the horizontal direction in FIG. 2) can be increased, and the engagement force of the undercut engagement between the flange 4g and the engagement protrusion 1h can be increased.

[0058] Although the present disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to cause logical inconsistency, and multiple components can be combined into one or divided. It should be understood that these are also included in the scope of the present invention.

[0059] For example, in this embodiment, the piston guide 9 has the role of a stem that fixes the nozzle head 14 via the jet ring 13 and the role of guiding the hollow piston 5, but it may be configured by dividing it into multiple parts according to their roles. [Industrial Applicability]

[0060] According to the present disclosure, it is possible to provide a new liquid dispenser 100 in which the pump is unlikely to come off the base cap 1 even when a force is applied in a direction that gouges the pump. [Explanation of symbols]

[0061] 1 Base Cap 1a Top wall 1b Exterior wall 1c hollow neck 1e Rib 1f through hole 1g Mating recess 1h Engagement protrusion 1h1 spiral projection 1j1,1j2,1j3,1j4,1j5,1j6 Circumferential position 2. Contents pump 3. Air pump 4 Cylinder 4a Small diameter cylinder 4b Large diameter cylinder 4c suction port 4d mating tube 4e Air intake hole 4g flange 5 Hollow Piston 5a Reduced diameter part 5b Seal part 6 Poppet 6a Valve section 6b Valve part 7 Cover material 7a Cylindrical pillar 7g Cover 7g1 Side opening 8. Spring 9 Piston guide 9a Cylindrical wall 9b Intermediate flange 9d Intermediate annular wall 9g Inward flange 9g1 Valve opening 10 Air piston 10a Cylindrical guide 10c bulkhead 10d hole 11. Fresh air intake valve 11a Valve body 11b Valve base 12 Mesh ring (foam material) 12a Mesh 13 Jet Ring 13a Lower cylindrical wall 13b Reduced diameter part 13c Upper cylinder part 13d stepped section 13g Cover 13h Communication groove 14 Nozzle head 14a Internal passage 14b Nozzle head main body 14c head ring 14d Inner cylindrical wall 14e Rib 14f Pressing part 14g edge wall 15 Stopper 100 liquid dispenser A1 First air passage A2 Second air passage B Ball valve C Container body C2 Mouth C2m male thread G Confluence space O center axis p Suction pipe PA Packing S Storage space S1 Recessed space t1 Internal passage t2 inner passage

Claims

1. a base cap having a cylindrical outer wall with a female thread portion that threadably engages with a male thread portion provided at the mouth of the container body and is attached to the mouth; a pump that is suspended from the mouth of the container body by the base cap and that draws in, pressurizes, and pumps the liquid contained therein; A liquid dispenser including a nozzle head for discharging the liquid content to the outside through an internal passage, A cylindrical cylinder defining the outer shape of the pump is provided with a flange extending radially outward from an upper portion thereof, and the cylinder is attached to the base cap by engaging a radially outer end of the flange with an engaging projection protruding radially inward from an inner surface above the female threaded portion of the outer wall of the base cap, The liquid ejector, wherein the engagement projection has a plurality of helical projections that form a spiral shape downward from a plurality of circumferential positions at an upper end of the engagement projection, and the helical shape has an inclination angle equal to that of the female thread portion.

2. The liquid ejector according to claim 1 , wherein the plurality of spiral projections do not overlap with one another in the circumferential direction.

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