Ejector

Abstract

To provide a discharge device which achieves reduction of environmental burdens and enables easy disposal by a user.SOLUTION: A discharge device 1 includes: a stem 21 disposed at the inner side of a mouth A1 in a container body A so as to be movable downward in a state that the stem 21 is biased upward; a cylindrical cylinder 23 into which the stem 21 is inserted; a piston 22 which is linked to vertical movement of the stem 21 in the cylinder 23 and fitted in an inner peripheral surface of the cylinder 23 so as to be slidable vertically; a biasing member 25 which encloses the stem 21 from the radial outer side and is attached to an upper part of the stem 21 to bias the stem 21 upward and made of a synthetic resin; and a push-down head 5 attached to an upper end part of the stem 21 and having a nozzle hole 54a which discharges a content fluid.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a dispenser.

Background Art

[0002] Conventionally, as shown in, for example, Patent Document 1 below, a stem that is disposed inside the mouth of a container body so as to be movable downward in an upwardly biased state, a cylindrical cylinder into which the stem is inserted, and the stem in the cylinder are provided. A dispenser is known that includes a piston that is linked to the vertical movement of the piston and is fitted to the inner peripheral surface of the cylinder so as to be vertically slidable, and a pressing head that is attached to the upper end of the stem and has a nozzle hole for discharging the content liquid. Generally, the biasing member that biases the stem upward is made of a metal material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the dispenser, from the viewpoint of reducing the environmental load and the viewpoint of facilitating disposal by the user, it is required not to use a biasing member made of a metal material.

[0005] The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a dispenser that can reduce the environmental load and facilitate disposal by the user.

Means for Solving the Problems

[0006] <1>The ejector according to one aspect of the present invention includes a stem disposed inside the mouth of the container body so as to be movable downward in an upwardly biased state, a cylindrical cylinder into which the stem is inserted, a piston that is linked to the vertical movement of the stem within the cylinder and is fitted to slidably move up and down on the inner peripheral surface of the cylinder, a biasing member made of synthetic resin that surrounds the stem from the radially outer side and is attached to the upper part of the stem to bias the stem upward, a push head attached to the upper end of the stem and having a nozzle hole for discharging the content liquid, and a piston retainer provided at the upper end of the cylinder. The piston retainer includes a first cylindrical portion fitted into the upper end portion of the cylinder, a second cylindrical portion disposed radially inside the first cylindrical portion, and a connecting portion that extends radially outward from the lower end of the second cylindrical portion to connect the first cylindrical portion and the second cylindrical portion. An annular gap is provided between the first cylindrical portion and the second cylindrical portion. The biasing member includes a plurality of annular bodies arranged at intervals in the vertical direction, and a connecting body that connects the annular bodies adjacent to each other in the vertical direction. Among the plurality of annular bodies, the annular body located at the lowermost side is fitted into the gap , among the plurality of annular bodies, the inner peripheral surface of the annular body located at the uppermost side is attached to the outer peripheral surface of the upper part of the stem. .

[0007] In this ejector, when the push head is pressed down and the stem and the piston descend, the biasing member is elastically compressed and deformed in the vertical direction as the stem descends. When the pressing of the push head is released, the biasing member is restored and deformed, and the stem, the piston, and the push head are pushed up. At this time, since the biasing member is attached to the stem, the stem is surely restored and displaced upward as the biasing member is restored and deformed. Therefore, for example, the occurrence of problems such as the descended stem not being restored and displaced upward can be suppressed. Since the biasing member is formed of a synthetic resin material, the environmental load can be reduced. Further, for example, an ejector in which all members are formed of a synthetic resin material can be realized. As a result, when the ejector is discarded, it is not necessary to separate the biasing member from other members made of the synthetic resin material. Therefore, it is possible to facilitate the disposal by the user. The biasing member is attached to the upper part of the stem. Therefore, for example, when the stem is pressed down, it is suppressed that only the stem descends into the cylinder without the biasing member being pressed down.

[0008] <2>In the ejector according to <1>, at least the stem, the cylinder, the piston, and the biasing member constitute a pump module, and the pressing head may be configured to be attached to the upper end of the stem in the pump module.

[0009] The pressing head is attached to the upper end of the stem in the pump module. Therefore, for example, when this ejector is applied to a plurality of products of different types, the pump module can be made common, and the pressing head and the like can be appropriately changed according to the product.

[0010] <3> The discharger according to one aspect of the present invention includes a stem disposed inside the mouth portion of the container body so as to be movable downward in an upwardly biased state, a cylindrical cylinder into which the stem is inserted, a piston that is linked to the vertical movement of the stem in the cylinder and is fitted to the inner peripheral surface of the cylinder so as to be vertically slidable, a biasing member made of synthetic resin that surrounds the stem from the radially outer side and is attached to the upper part of the stem to bias the stem upward, and a pressing head attached to the upper end portion of the stem and having a nozzle hole for discharging the content liquid. A piston retainer made of synthetic resin provided at the upper end of the cylinder and is provided, and the biasing member may be configured to be integrally formed with the piston retainer and extend upward from the piston retainer.

[0011] The biasing member is integrally formed with the piston retainer. That is, the biasing member and the piston retainer are formed by one molded product. Therefore, an increase in the number of parts can be suppressed, and the ejector can be easily assembled.

Effect of the Invention

[0012] According to the present invention, it is possible to reduce the environmental load and facilitate disposal by the user.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0014] (First Embodiment) Hereinafter, a first embodiment of a dispenser according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the dispenser 1 of the present embodiment includes a pump module 2 having a stem 21, a push head 5 attached to the stem 21, and a mounting cap 7 for mounting the pump module 2 on the mouth A1 of a container body A in which the content liquid is stored. All the components constituting the dispenser 1 are formed of a synthetic resin material.

[0015] The stem 21 and the mounting cap 7 are arranged coaxially with a common axis. Hereinafter, this common axis is referred to as a central axis O, the push head 5 side along the central axis O is referred to as the upper side, and the bottom side (not shown) of the container body A is referred to as the lower side. Also, the direction along the central axis O is referred to as the vertical direction, the direction intersecting the central axis O as viewed from the vertical direction is referred to as the radial direction, and the direction of orbiting around the central axis O is referred to as the circumferential direction.

[0016] The container body A is formed in a bottomed cylindrical shape, and a male thread is formed on the outer peripheral surface of the mouth A1. The container body A is arranged coaxially with the central axis O. The mounting cap 7 is formed in a toped cylindrical shape having an annular top wall and a peripheral wall. Inside the top wall of the mounting cap 7, the stem 21 is inserted so as to be vertically movable. On the inner peripheral surface of the peripheral wall of the mounting cap 7, an internal thread that engages with the external thread of the mouth portion A1 is formed. Note that the peripheral wall of the mounting cap 7 may be, for example, undercut-fitted to the mouth portion A1. The mounting cap 7 further includes a guide cylinder 73 that protrudes upward from the top wall. The guide cylinder 73 is disposed coaxially with the central axis O.

[0017] The pump module 2 includes a stem 21, a piston guide 40, a piston 22, a cylinder 23, a lower valve body 24, a packing 9, and a biasing member 25.

[0018] The cylinder 23 is formed in a bottomed cylindrical shape having an annular bottom wall and a peripheral wall, and is disposed coaxially with the central axis O. An attachment cylinder 27 that extends downward is provided at the inner peripheral edge portion of the bottom wall of the cylinder 23. The upper end portion of a suction cylinder 28 (pipe) is fitted to the attachment cylinder 27. The lower end opening of the suction cylinder 28 is located inside the bottom portion (not shown) of the container body A. At the upper end portion of the peripheral wall of the cylinder 23, a fixed flange portion 29 that protrudes radially outward and extends in the circumferential direction is formed. The fixed flange portion 29 is disposed on the upper end opening edge of the mouth portion A1 of the container body A via the packing 9. The lower surface of the top wall of the mounting cap 7 is disposed on the upper surface of the fixed flange portion 29. A lower valve body 24 is provided inside the lower end portion of the peripheral wall of the cylinder 23.

[0019] The lower valve body 24 includes a fitting cylinder 31, a valve main body 32, and a connecting piece 33. The fitting cylinder 31 is fitted inside the lower end portion of the peripheral wall of the cylinder 23. The valve main body 32 is formed in a plate shape and seats on the opening peripheral edge portion on the upper surface of the bottom wall of the cylinder 23, closing the inside of the bottom wall of the cylinder 23. The valve main body 32 is connected to the inner peripheral surface of the fitting cylinder 31 via an elastically deformable connecting piece 33. The valve main body 32 is elastically displaced in the vertical direction as the connecting piece 33 elastically deforms. The lower valve body 24 serves as a check valve that holds the inside of the bottom wall of the cylinder 23 closed when pressurized inside the cylinder 23 and releases the inside of the bottom wall of the cylinder 23 when depressurized inside the cylinder 23. Thereby, when the cylinder 23 is pressurized, the lower valve body 24 prevents the content liquid inside the cylinder 23 from returning to the container body A through the inside of the bottom wall of the cylinder 23, while when the cylinder 23 is depressurized, the content liquid inside the container body A flows into the cylinder 23 through the inside of the bottom wall of the cylinder 23.

[0020] The stem 21 is erected in the mouth portion A1 so as to be movable downward in an upwardly biased state. The stem 21 is formed in a cylindrical shape. The lower end portion 21a of the stem 21 is accommodated inside the cylinder 23. The lower end portion 21a of the stem 21 has a larger diameter than the portion of the stem 21 located above the lower end portion 21a. The upper portion of the stem 21 is located above the upper end opening of the cylinder 23.

[0021] The piston guide 40 is attached to the stem 21 from below. The piston guide 40 is formed in a bottomed cylindrical shape. The upper end portion of the piston guide 40 is fitted into the portion of the stem 21 located above the lower end portion 21a. A communication hole 34 penetrating in the radial direction is formed in the piston guide 40. A pedestal portion 35 protruding outward in the radial direction is formed in the piston guide 40. The pedestal portion 35 is formed in the portion of the piston guide 40 located below the communication hole 34. The pedestal portion 35 supports the piston 22 from below the piston 22.

[0022] The piston 22 includes an outer cylinder 38, an inner cylinder 37, and a connecting plate 39. The outer cylinder 38 is formed in a cylindrical shape and provided coaxially with the central axis O. The outer cylinder 38 is fitted into the cylinder 23 so as to be slidable up and down. In the cylinder 23, a through hole penetrating in the radial direction is formed in the portion facing the outer cylinder 38 in the radial direction. The inner cylinder 37 is formed in a cylindrical shape and is provided coaxially with the central axis O. The lower end portion of the inner cylinder 37 is detachably seated on the pedestal portion 35 of the piston guide 40. Thereby, the inner cylinder 37 switches the communication and the cutoff between the portion located below the piston 22 (hereinafter referred to as the lower chamber 23a) in the cylinder 23 and the communication hole 34 of the piston guide 40. Such a piston guide 40 functions as an upper valve body in the pump module 2. The upper portion of the inner cylinder 37 is fitted slidably up and down within the lower end portion 21a of the stem 21. The connecting plate 39 connects the inner peripheral surface of the outer cylinder 38 and the outer peripheral surface of the inner cylinder 37 and extends continuously over the entire circumferential length. The upper surface of the connecting plate 39 faces the lower end opening edge (lower end portion 21a) of the stem 21 with a vertical gap therebetween.

[0023] The pressing head 5 is formed in a toped cylindrical shape having a top wall portion 51 and an outer cylinder portion 52 and is disposed coaxially with the central axis O. The outer cylinder portion 52 is provided radially inside the guide cylinder 73 of the mounting cap 7. The lower end portion of the outer cylinder portion 52 is located below the upper end portion of the guide cylinder 73. The pressing head 5 has a mounting cylinder portion 53 protruding downward from the top wall portion 51, a nozzle cylinder portion 54 extending radially outward from the mounting cylinder portion 53 and penetrating the outer cylinder portion 52 in the radial direction, and a rib 55 extending downward from the top wall portion 51. A nozzle hole 54a opening in the radial direction is formed at the tip of the nozzle cylinder portion 54. The inside of the nozzle cylinder portion 54 communicates with the inside of the mounting cylinder portion 53. The mounting cylinder portion 53 is disposed coaxially with the central axis O. The lower end portion of the mounting cylinder portion 53 is located above the lower end portion of the outer cylinder portion 52. The upper end portion of the stem 21 is fitted outside the mounting cylinder portion 53. The mounting cylinder portion 53 is inserted into the stem 21. The radially inner end portion of the rib 55 is connected to the outer peripheral surface of the mounting cylinder portion 53. The radially outer end portion of the rib 55 is connected to the inner peripheral surface of the outer cylinder portion 52. The lower end of the rib 55 is located below the lower end of the nozzle cylinder portion 54. A plurality of ribs 55 are arranged at intervals in the circumferential direction.

[0024] Here, a piston retainer 41 is provided at the upper end of the cylinder 23. The piston retainer 41 functions as a stopper for the components within the cylinder 23, such as the piston 22. The stem 21 is inserted through the piston retainer 41. The piston retainer 41 is arranged coaxially with the central axis O. The piston retainer 41 includes a plate portion 42, a first cylindrical portion 43, a second cylindrical portion 44, and a connecting portion 45. The plate portion 42 is an annular plate with its front and back surfaces facing in the vertical direction. The outer peripheral portion of the plate portion 42 is disposed on the fixed flange portion 29. The outer peripheral portion of the plate portion 42 is sandwiched vertically between the fixed flange portion 29 and the mounting cap 7. The first cylindrical portion 43 extends downward from the inner peripheral edge of the plate portion 42. The first cylindrical portion 43 is fitted within the upper end portion of the peripheral wall of the cylinder 23. The first cylindrical portion 43 is disposed between the upper end portion of the peripheral wall of the cylinder 23 and the lower end portion 21a of the stem 21. The second cylindrical portion 44 is disposed radially inside the first cylindrical portion 43. The second cylindrical portion 44 is disposed above the vertical center of the first cylindrical portion 43. The second cylindrical portion 44 is disposed above the lower end portion 21a of the stem 21. The connecting portion 45 connects the first cylindrical portion 43 and the second cylindrical portion 44. The connecting portion 45 is annular. The connecting portion 45 extends radially outward from the lower end of the second cylindrical portion 44. The radially outer peripheral edge of the connecting portion 45 is connected to the inner peripheral surface of the first cylindrical portion 43. An annular gap is provided between the first cylindrical portion 43 and the second cylindrical portion 44.

[0025] The biasing member 25 extends upward from the piston retainer 41. The biasing member 25 is disposed outside the cylinder 23. The biasing member 25 is formed in a cylindrical shape as a whole. The biasing member 25 surrounds the stem 21 from the outside in the radial direction. The biasing member 25 is disposed inside the guide cylinder 73.

[0026] In the illustrated example, the biasing member 25 includes a plurality of annular bodies 25a and a plurality of connecting bodies 25b. The plurality of annular bodies 25a are arranged at intervals in the vertical direction. The plurality of annular bodies 25a are arranged coaxially with the central axis O. The annular bodies 25a adjacent to each other in the vertical direction are connected to each other via the connecting body 25b. In the present embodiment, the biasing member 25 is formed by alternately arranging the annular bodies 25a and the connecting bodies 25b in the vertical direction. The connecting body 25b elastically connects the annular bodies 25a adjacent to each other in the vertical direction. The connecting body 25b includes a plurality (for example, three) of spring pieces 25c arranged at intervals in the circumferential direction. The spring piece 25c is inclined with respect to the central axis O in a front view when the spring piece 25c is viewed from the outer side in the radial direction. In the connecting bodies 25b adjacent to each other with the annular body 25a interposed therebetween, the directions in which the spring pieces 25c are inclined are opposite to each other. Among the connecting bodies 25b adjacent to each other with the annular body 25a interposed therebetween, the lower end of the spring piece 25c in the upper connecting body 25b is at the same position in the circumferential direction as the upper end of the spring piece 25c in the lower connecting body 25b. Note that the form of the biasing member 25 is not limited to this, and a known resin spring form can be adopted. For example, the designer may appropriately change the radial thickness (wall thickness) of the biasing member 25.

[0027] The lower end portion of the biasing member 25 is fixed to the upper surface of the piston retainer 41. The lower end portion of the biasing member 25 is fitted into the gap between the first cylinder portion 43 and the second cylinder portion 44 of the piston retainer 41. In the illustrated example, the lowermost annular body 25a of the biasing member 25 is fitted into the gap. The lower end portion of the biasing member 25 is supported by the connecting portion 45.

[0028] The biasing member 25 is attached to the upper portion of the stem 21. In the illustrated example, a convex portion 25d is provided at the upper end portion of the biasing member 25. The convex portion 25d is provided on the annular body 25a located at the uppermost side among the plurality of annular bodies 25a. Note that the annular body 25a located at the uppermost side is larger in the vertical direction and thicker in the radial direction than the other annular bodies 25a. The convex portion 25d protrudes radially inward from the biasing member 25. A concave portion 21d is provided at the upper end portion of the stem 21. The concave portion 21d is recessed radially inward from the outer peripheral surface of the stem 21. The convex portion 25d is fitted into the concave portion 21d. The concave portion 21d and the convex portion 25d are undercut-fitted, and the convex portion 25d is fitted into the concave portion 21d so as to be substantially non-displaceable relative to the concave portion 21d in the vertical direction. In other words, the convex portion 25d is fitted into the concave portion 21d without play in the vertical direction. As a result, in the present embodiment, the upper end portion of the biasing member 25 and the upper end portion of the stem 21 are non-displaceable relative to each other in the vertical direction.

[0029] Note that the convex portion 25d may be fitted into the concave portion 21d so as to be relatively displaceable in the vertical direction. In other words, the convex portion 25d may be fitted into the concave portion 21d with play in the vertical direction. Such a configuration can be realized, for example, when the vertical size of the concave portion 21d is larger than the vertical size of the convex portion 25d. The vertical size of the concave portion 21d may be about 1 to 1.5 times the vertical size of the convex portion 25d. In this case, the biasing member 25 and the stem 21 are slightly relatively displaceable in the vertical direction. Furthermore, in the present embodiment, the upper end portion of the biasing member 25 is attached to the upper end portion of the stem 21, but it can be appropriately changed to other forms in which the biasing member 25 is attached to the upper portion of the stem 21. For example, the upper end portion of the biasing member 25 may be attached to a portion located closer to the center rather than a portion located closer to the end in the vertical direction of the upper portion of the stem 21. Also, in the illustrated example, the upper end surface of the biasing member 25 is separated downward from the pressing head 5 (the lower end of the rib 55), but the upper end surface of the biasing member 25 may be in contact with the pressing head 5.

[0030] Next, the operation of the ejector 1 shown in FIG. 1 will be described.

[0031] When the pressing head 5 is pushed down, while the stem 21 descends, the upper end portion of the biasing member 25 descends in linkage with the upper end portion of the stem 21, and the biasing member 25 is elastically compressed and deformed in the vertical direction. At this time, the seal between the pedestal portion 35 of the piston guide 40 and the inner cylinder 37 of the piston 22 is released, and the lower chamber 23a in the cylinder 23 and the communication hole 34 of the piston guide 40 communicate with each other. When the pressing head 5 is further continuously pushed down from this state, the lower end opening edge of the stem 21 abuts against the upper surface of the connecting plate 39 of the piston 22, so that the piston 22 also moves downward together with the pressing head 5. As a result, the lower chamber 23a in the cylinder 23 is pressurized, and the content liquid in the cylinder 23 passes through the vertical gap between the pedestal portion 35 and the piston 22, the communication hole 34, the inside of the stem 21, the inside of the mounting cylinder portion 53, and the inside of the nozzle cylinder portion 54 in this order, and is discharged from the nozzle hole 54a. At this time, the valve body 32 of the lower valve body 24 is kept seated on the opening peripheral edge portion on the upper surface of the bottom wall of the cylinder 23.

[0032] Thereafter, when the pushing down of the pressing head 5 is released, the pressing head 5 moves upward together with the stem 21 by the upward biasing force of the biasing member 25. In this process, the pedestal portion 35 of the piston guide 40 abuts against the piston 22 from below the piston 22, and the communication between the lower chamber 23a in the cylinder 23 and the communication hole 34 of the piston guide 40 is blocked by sealing between the pedestal portion 35 and the inner cylinder 37. Then, when the piston 22 also moves upward together with the pressing head 5, the lower chamber 23a in the cylinder 23 is depressurized, and the valve body 32 of the lower valve body 24 is separated upward from the opening peripheral edge portion on the upper surface of the bottom wall of the cylinder 23 while elastically deforming the connecting piece 33, so that the content liquid in the container body A flows into the cylinder 23 through the suction cylinder 28. When the biasing member 25 is restored and deformed, the biasing member 25 is attached to the stem 21, and the stem 21 is surely restored and displaced upward along with the restoration and deformation of the biasing member 25. Therefore, for example, the occurrence of problems such as the descended stem 21 not being restored and displaced upward can be suppressed.

[0033] As described above, according to the ejector 1 according to the present embodiment, since the biasing member 25 is formed of a synthetic resin material, the environmental load can be reduced. Further, for example, it is possible to realize the ejector 1 in which all members are formed of a synthetic resin material. As a result, when the ejector 1 is discarded, it is possible to eliminate the need to separate the biasing member 25 and other members made of a synthetic resin material. Therefore, it is possible to facilitate the disposal by the user. The biasing member 25 is attached to the upper portion of the stem 21. Therefore, for example, when the stem 21 is pressed down, it is possible to suppress, among other things, that only the stem 21 descends into the cylinder 23 without the biasing member 25 being pressed down.

[0034] The pressing head 5 is attached to the upper end portion of the stem 21 in the pump module 2. Therefore, for example, when this ejector 1 is applied to a plurality of products of different types, it is possible to make the pump module 2 common and appropriately change the pressing head 5 and the mounting cap 7 according to the product.

[0035] (Second Embodiment) Next, an ejector according to the second embodiment of the present invention will be described with reference to FIG. 4. In this second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and only the differences will be described.

[0036] In the ejector 1A according to the present embodiment, the piston retainer 41 and the biasing member 25 are integrally formed. The piston retainer 41 and the biasing member 25 are one molded product (injection molded product) made of synthetic resin. The piston retainer 41 includes a plate portion 42 and a first cylindrical portion 43, and does not include a second cylindrical portion 44 and a connecting portion 45. The biasing member 25 extends upward from the piston retainer 41. The biasing member 25 is provided at the inner peripheral edge of the plate portion 42. The biasing member 25 is disposed on the opposite side of the first cylindrical portion 43 with the plate portion 42 sandwiched in the vertical direction.

[0037] As described above, according to the ejector 1A according to the present embodiment, the biasing member 25 is integrally formed with the piston retainer 41. That is, the biasing member 25 and the piston retainer 41 are formed by one molded product. Therefore, an increase in the number of parts can be suppressed. Further, by attaching the piston retainer 41 to the upper end portion of the peripheral wall of the cylinder 23, the biasing member 25 can be assembled to the cylinder 23. Therefore, the ejector 1 can be easily assembled.

[0038] Note that the technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0039] The form of attachment between the biasing member 25 and the upper portion of the stem 21 is not limited to the concave-convex fitting as in the above-described embodiment. For example, the form of attachment may be a form using an adhesive layer 25e as shown in FIG. 5. In this case, the adhesive layer 25e is disposed between the upper end portion of the biasing member 25 and the upper end portion of the stem 21. The adhesive layer 25e is formed by an adhesive. Note that the biasing member 25 may be attached to the upper portion of the stem 21 by welding instead of adhesion. For example, the form of attachment may be a form using male threads 21f and female threads 25f as shown in FIG. 6. In this case, the male threads 21f are provided on the outer peripheral surface of the upper end portion of the stem 21, and the female threads 25f are provided on the inner peripheral surface of the upper end portion of the biasing member 25. The male threads 21f and the female threads 25f are screwed together. For example, the form of attachment may be a form using ribs 21g, 25g as shown in FIG. 7. In this case, the rib 21g is provided on the outer peripheral surface of the upper end portion of the stem 21, and the rib 25g is provided on the inner peripheral surface of the upper end portion of the biasing member 25. The rib 21g is a vertical rib extending in the vertical direction, and the rib 25g is a horizontal rib extending in the circumferential direction. These ribs 21g, 25g are engaged with each other. Thereby, the above attachment is realized. Furthermore, in addition to the above-described forms, the form of attachment may be an undercut fitting, press-fitting, or the like.

[0040] Not all components constituting the ejectors 1 and 1A need to be made of synthetic resin. The pump module 2 may not include the packing 9. For example, the pump module 2 and the packing 9 may be prepared separately, and when assembling the pump module to the container body A, the packing 9 may be disposed between the pump module 2 and the container body A. In the second embodiment, the biasing member 25 is integrally formed with the piston retainer 41, but the present invention may be in other forms in which the biasing member 25 is integrally formed with the cylinder 23. For example, the biasing member 25 may be integral with the fixed flange portion 29 or the peripheral wall of the cylinder 23.

[0041] In addition, within the scope not departing from the gist of the present invention, it is possible to appropriately replace the components in the above embodiments with well-known components, and the above-described modified examples may be appropriately combined.

Explanation of Reference Numerals

[0042] 1, 1A Ejector 2 Pump module 5 Pressing head 7 Mounting cap 21 Stem 22 Piston 23 Cylinder 25 Biasing member 41 Piston retainer A Container body A1 Mouth portion

Claims

1. a stem disposed inside the mouth of the container body so as to be movable downward in an upwardly biased state, a cylindrical cylinder into which the stem is inserted, a piston that is linked to the vertical movement of the stem within the cylinder and is fitted slidably in the vertical direction to the inner peripheral surface of the cylinder, a biasing member made of synthetic resin that surrounds the stem from the outside in the radial direction and is attached to the upper part of the stem to bias the stem upward, a pressing head attached to the upper end of the stem and having a nozzle hole for discharging the content liquid, a piston retainer provided at the upper end of the cylinder, and comprising: the piston retainer includes a first cylindrical portion fitted inside the upper end of the cylinder, a second cylindrical portion disposed inside the first cylindrical portion in the radial direction, and a connecting portion extending radially outward from the lower end of the second cylindrical portion to connect the first cylindrical portion and the second cylindrical portion, an annular gap is provided between the first cylindrical portion and the second cylindrical portion, the biasing member includes a plurality of annular bodies arranged at intervals in the vertical direction and a connecting body connecting the annular bodies adjacent to each other in the vertical direction, among the plurality of annular bodies, the lowermost annular body is fitted into the gap, an inner peripheral surface of the uppermost annular body among the plurality of annular bodies is attached to an outer peripheral surface of an upper portion of the stem, a discharger.

2. at least the stem, the cylinder, the piston, and the biasing member constitute a pump module, the pressing head is attached to the upper end of the stem in the pump module, the discharger according to claim 1.

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