Foamer pump

Abstract

To provide a foamer pump that can suppress liquid contact with a spring.SOLUTION: A foamer pump 2 comprises: an air cylinder 2a held radially outward of an opening 3a of a container body 3 by being mounted on an outer peripheral surface of the opening 3a; a liquid cylinder 2b held radially inward of the opening 3a of the air cylinder 2a by being mounted on the opening 3a; an air piston 2c1; a liquid piston 2d; an air chamber 2e; a liquid chamber 2f; a lifting section 2g that lifts and lowers with the air piston 2c1 and the liquid piston 2d; and a spring 2h that generates a biasing force to raise the lifting section 2g. By lifting and lowering the lifting section 2g, content liquid 4 pressurized and fed through the liquid chamber 2f from inside the container body 3 and air pressurized and fed from the air chamber 2e are mixed to become foamy and discharged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A foamer pump is known that includes an air cylinder attached to the outer peripheral surface of the mouth of a container body and held radially outside the mouth, a liquid cylinder attached to the mouth of the air cylinder and held radially inside the mouth, an air piston that slides up and down relative to the air cylinder, a liquid piston that slides up and down relative to the liquid cylinder, an air chamber defined by the air cylinder and the air piston, a liquid chamber defined by the liquid cylinder and the liquid piston, an elevator that moves up and down with the air piston and the liquid piston, and a spring that generates a biasing force to lift the elevator part, and that, as the elevator part moves up and down, mixes the liquid content, which is pressurized from inside the container body through the liquid chamber, with air, which is pressurized from the air chamber, to form a foam and discharge the foam (see, for example, Patent Document 1). The above configuration is suitable for constructing a small-discharge foamer pump that discharges a small amount of liquid content in the form of a foam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-27265 Summary of the Invention [Problem to be solved by the invention]

[0004] In the foamer pump having the above-described configuration, depending on the material of the spring and the type of contents, contact of the spring with liquid may cause problems such as corrosion of the spring.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a foamer pump that can prevent liquid from coming into contact with the spring. [Means for solving the problem]

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

[0007] [1] an air cylinder attached to the outer circumferential surface of a mouth of a container body having a mouth, a body, and a bottom connected in this order, and held radially outward from the mouth; a liquid cylinder that is held radially inside the mouth portion by being attached to the mouth portion of the air cylinder; an air piston that slides up and down relative to the air cylinder; a liquid piston that slides up and down relative to the liquid cylinder; an air chamber defined by the air cylinder and the air piston; a liquid chamber defined by the liquid cylinder and the liquid piston; a lifting unit that moves up and down together with the air piston and the liquid piston; a spring that generates a biasing force that raises the lifting unit, a foamer pump that mixes the liquid content pressure-fed from the container body through the liquid chamber with air pressure-fed from the air chamber by raising and lowering the lifting part, to form foam and discharge the foam, an outside air supply path for supplying outside air into the container body to replace the content liquid discharged from the container body; The air cylinder has a seal tube whose diameter expands upward, The spring is disposed in a spring chamber defined radially inside the seal cylinder, the air piston has a sealing surface on an inner circumferential surface of the air piston; an upper end of the sealing cylinder contacts the sealing surface to isolate the spring chamber from the air chamber; the outside air supply path has an air flow path that connects the gap between the outer circumferential surface of the opening portion and the air cylinder to the spring chamber through the gap between the air cylinder and the liquid cylinder, the spring chamber, and an air vent provided in the liquid cylinder, and the outside air passes through the air flow path, the spring chamber, and the air vent in this order; Foamer pump.

[0008] [2] the lifting unit has a stem extending in a vertical direction on the radially inner side of the seal cylinder, and an air piston member having the air piston and integrally attached to an upper end of the stem, the air piston member has a fitting peripheral wall whose outer circumferential surface fits onto the upper end of the spring, The foamer pump according to [1], wherein an inner circumferential surface of a lower end of the sealing cylinder is fitted onto a lower end of the spring.

[0009] [3] the air piston member has a sealing peripheral wall having the sealing surface, and an annular wall whose upper end portion is connected over the entire periphery to an upper end portion of the fitting peripheral wall provided radially inward of the sealing peripheral wall, The foamer pump described in [2], wherein the lifting unit has a push-down head unit that is integrally held above the air piston, and an air flow path that is defined by the push-down head unit, the outer surface of the sealing peripheral wall, the upper surface of the annular wall, and the inner surface of the fitting peripheral wall, and by pressing down the push-down head unit, the air is pressurized from the air chamber through the air flow path, mixed with the content liquid to form foam, and discharged.

[0010] [4] the lifting unit has a stem extending in a vertical direction on the radially inner side of the seal cylinder, and an air piston member having the air piston and integrally attached to an upper end of the stem, the air piston member has a fitting peripheral wall whose outer circumferential surface fits onto the upper end of the spring, the air piston member has a sealing peripheral wall having the sealing surface, and an annular wall whose vertical intermediate portion of the sealing peripheral wall is connected over the entire periphery to an upper end portion of the fitting peripheral wall provided radially inward of the sealing peripheral wall, The lifting unit has a push-down head unit integrally held on the upper side of the air piston, and an air flow path defined by the push-down head unit, the outer peripheral surface of the sealing peripheral wall, the upper surface of the annular wall, and the inner peripheral surface of the fitting peripheral wall, and by pressing down the push-down head unit, the air is pressure-fed from the air chamber through the air flow path, mixed with the content liquid to form foam, and then discharged, The foamer pump according to any one of [1] to [3], wherein the air piston member has a check valve that prevents backflow in the air flow path.

[0011] [5] The air piston member includes an inner air piston member and an outer air piston member, the inner air piston member has the fitting peripheral wall and the annular wall and is integrally attached to the upper end of the stem; the outer air piston member includes the air piston, the sealing peripheral wall, and a check valve, and is integrally attached to the outer peripheral edge portion of the annular wall; The check valve is annular and extends radially inward from a portion of the sealing peripheral wall above the annular wall, and the inner peripheral edge of the check valve seats on the push-down head portion to suppress backflow in the air flow path, and the flow of air in the air flow path from the air chamber is permitted by the inner peripheral edge of the check valve moving away from the push-down head portion due to elastic deformation of the check valve. [4] The foamer pump described in [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a foamer pump that can prevent liquid from coming into contact with the spring. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing a state before a pressing operation of a foam dispensing container according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view showing the state when the foam dispensing container shown in FIG. 1 is pressed down. [Figure 3]FIG. 10 is a cross-sectional view showing a state before a pressing operation of a foam dispensing container according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] As shown in FIG. 1, in the first embodiment of the present invention, a foam-dispensing container 1 includes a foamer pump 2 and a container body 3. The container body 3 is bottle-shaped, having a mouth 3a, a body 3b, and a bottom, which are connected in this order. The body 3b has a shoulder region 3b1 extending radially outward from the lower end of the mouth 3a, and defines an internal storage space S for storing the liquid content 4. The liquid content 4 is not particularly limited as long as it is liquid. 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 toward the mouth 3a along the vertical direction, and 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.

[0016] As shown in FIGS. 1 and 2, the foamer pump 2 includes an air cylinder 2a attached to the outer peripheral surface of the mouth 3a of the container body 3 and held radially outside the mouth 3a, a liquid cylinder 2b attached to the mouth 3a of the air cylinder 2a and held radially inside the mouth 3a, an air piston 2c1 that slides up and down relative to the air cylinder 2a, a liquid piston 2d that slides up and down relative to the liquid cylinder 2b, and a piston 2c1 between the air cylinder 2a and the air piston 2c1. the liquid chamber 2f defined by the liquid cylinder 2b and the liquid piston 2d; a lifting section 2g that rises and falls together with the air piston 2c1 and the liquid piston 2d; and a spring 2h that generates a biasing force to raise the lifting section 2g. As the lifting section 2g rises and falls, the liquid content 4 (see the thick arrow in Figure 2) that has been pressurized from inside the container body 3 through the liquid chamber 2f and the air (see the hollow arrow in Figure 2) that has been pressurized from the air chamber 2e are mixed together to form foam, which is then discharged.

[0017] The air cylinder 2a has a sealing tube 2a1 that expands in diameter while thinning toward the top, the spring 2h is arranged in a spring chamber 2i2 defined radially inside the sealing tube 2a1, the air piston 2c1 has a sealing surface 6a on the inner surface of the air piston 2c1, and the upper end of the sealing tube 2a1 comes into contact with the sealing surface 6a to isolate the spring chamber 2i2 from the air chamber 2e. The foamer pump 2 has an outside air supply path 2i that supplies outside air into the container body 3 to replace the content liquid 4 discharged from the container body 3. The outside air supply path 2i has an air vent flow path 2i1 that connects the gap G between the outer peripheral surface of the mouth portion 3a and the air cylinder 2a to the spring chamber 2i2 through the gap between the air cylinder 2a and the liquid cylinder 2b, the spring chamber 2i2, an inner air vent flow path 2i3 (described later), and an air vent 2i4 provided in the liquid cylinder 2b, and passes outside air through the air vent flow path 2i1, spring chamber 2i2, inner air vent flow path 2i3, and air vent 2i4 in that order (see dashed arrows in Figure 2).

[0018] The lifting section 2g has a stem 2g1 extending vertically radially inside the seal cylinder 2a1, and an air piston member 2c having an air piston 2c1 and integrally attached to the upper end of the stem 2g1. The air piston member 2c has a fitting peripheral wall 7 whose outer peripheral surface fits onto the upper end of the spring 2h, and the inner peripheral surface of the lower end of the seal cylinder 2a1 fits onto the lower end of the spring 2h. The spring 2h is an annular compression spring centered on the central axis O. In this embodiment, the spring 2h is coil-shaped and made of metal. However, the spring 2h may have an annular shape other than a coil shape, or may be made of a material other than metal, such as resin. The sealing tube 2a1 has an engaging tube portion 2a2 whose inner peripheral surface engages with the lower end of the spring 2h, and an expanding diameter tube portion 2a3 which extends upward from the upper end of the engaging tube portion 2a2 and whose inner peripheral surface gradually expands in diameter as it goes upward, and the outer peripheral surface of the upper end of the expanding diameter tube portion 2a3 contacts the sealing surface 6a.

[0019] The air cylinder 2a includes an attachment tube 2a4 attached to the outer circumferential surface of the mouth portion 3a by thread engagement 5, an annular cap top wall 2a5 extending radially inward from the upper end of the attachment tube 2a4, a seal tube 2a1 extending upward from the inner circumferential edge of the cap top wall 2a5, an annular air cylinder bottom wall 2a6 extending radially outward from the lower end of the attachment tube 2a4, and a cylindrical air cylinder wall 2a7 extending upward from the outer circumferential edge of the air cylinder bottom wall 2a6 and centered on the central axis O. The air cylinder bottom wall 2a6 has an outside air inlet 2a8 facing the upper surface of the shoulder region 3b1 of the body portion 3b with a gap therebetween. In this embodiment, the outside air inlet 2a8 is configured as a plurality of through holes spaced apart circumferentially, but this is not limiting. An outside air introduction valve 2j is disposed in the air chamber 2e, and the outside air introduction valve 2j prevents air in the air chamber 2e from being discharged through the outside air introduction port 2a8 while allowing air to be introduced into the air chamber 2e through the outside air introduction port 2a8. The outside air introduction valve 2j has a cylindrical body 2j1 attached to the outer peripheral surface of the mounting cylinder 2a4, and a valve body 2j2 that is elastically deformable in the vertical direction and extends radially outward from the lower end of the cylindrical body 2j1, covering the outside air introduction port 2a8.

[0020] The air piston member 2c has a sealing peripheral wall 6 having a sealing surface 6a and an annular wall 8 whose upper end is connected to the upper end of a fitting peripheral wall 7 provided radially inward of the sealing peripheral wall 6 along the entire circumference. The lifting section 2g has a press-down head portion 2g2 integrally held on the upper side of the air piston 2c1 and an air flow path 2g3 defined by the press-down head portion 2g2, the outer surface of the sealing peripheral wall 6, the upper surface of the annular wall 8, and the inner surface of the fitting peripheral wall 7. The press-down head portion 2g2 has a press-down head main body 14, a foaming member 15, and a retaining cylinder 16 that holds the foaming member 15 inside and is attached to and held by the press-down head main body 14. The air piston member 2c has an annular air piston 2c1 centered on a central axis O and a stem connecting portion 2c2 that is connected to the inner peripheral edge of the air piston 2c1 and is attached to and held at the upper end of a stem 2g1. When the lifting unit 2g presses down on the pressing head unit 2g2, it pressurizes and sends air from the air chamber 2e through the air flow path 2g3, mixes the air with the liquid content 4, and makes it foamy, which is then discharged.

[0021] The air piston 2c1 has an air piston sliding portion 9 that is cylindrical and has a narrowed vertical middle portion, and that slides vertically on the inner circumferential surface of the air cylinder wall 2a7, an outer annular wall 10 that extends radially inward from the vertical middle portion of the air piston sliding portion 9, an outer peripheral wall 11 that extends upward from the inner circumferential edge of the outer annular wall 10, an intermediate annular wall 12 that extends radially inward from the upper end of the outer peripheral wall 11, a sealing peripheral wall 6 that extends upward from the inner circumferential edge of the intermediate annular wall 12, a cylindrical fitting wall 13 that extends upward from the radial middle portion of the intermediate annular wall 12 and faces the outer circumferential surface of the sealing peripheral wall 6 with a gap therebetween, the annular wall 8, and the fitting peripheral wall 7. The intermediate annular wall 12 has a communication port 12a that constitutes the upstream end of an air flow path 2g3 that communicates with the air chamber 2e. In this embodiment, the communication openings 12a are configured by a plurality of through holes provided at intervals in the circumferential direction, but are not limited to this.

[0022] The material for forming the air cylinder 2a and the air piston member 2c is not particularly limited, and may be, for example, a resin.

[0023] The push-down head body 14 has an outer peripheral wall 14a that is attached by fitting to the outer peripheral surface of the fitting wall 13, a top wall portion 14b that is continuous with the upper end of the outer peripheral wall 14a, an inner peripheral wall 14c that extends downward from the top wall portion 14b radially inward of the outer peripheral wall 14a and forms part of the air flow path 2g3 between it and the outer peripheral surface of the sealing peripheral wall 6, a retaining peripheral wall 14d that extends downward from the top wall portion 14b radially inward of the inner peripheral wall 14c and has a retaining tube 16 attached to its inner peripheral surface for retention, and a discharge port 14e that discharges the foamy content liquid 4 through the top wall portion 14b.

[0024] The outer peripheral surface of the retaining cylinder 16 has an attachment cylinder portion 16a attached to and held by the inner peripheral surface of the retaining peripheral wall 14d, an annular stepped wall portion 16b extending radially inward from the lower end of the attachment cylinder portion 16a, and a lower cylinder portion 16c extending downward from the inner peripheral edge of the stepped wall portion 16b, the lower surface of the stepped wall portion 16b abutting against the upper surface of the annular wall 8, and the outer peripheral surface of the lower cylinder portion 16c abutting against the inner peripheral surface of the fitting peripheral wall 7, and the air flow path 2g3 causes air to pass between the stepped wall portion 16b and the annular wall 8 and between the lower cylinder portion 16c and the fitting peripheral wall 7 in this order, to join the content liquid 4. The lower end of the retaining cylinder 16 forms an inlet 16d that allows the content liquid 4 to flow into the interior of the retaining cylinder 16.

[0025] The liquid cylinder 2b has a liquid cylinder wall 2b1 centered on the central axis O, a flange 2b2 extending radially outward from the upper end of the liquid cylinder wall 2b1, and a liquid cylinder bottom wall 2b3 connected to the lower end of the liquid cylinder wall 2b1, the liquid cylinder bottom wall 2b3 having a liquid inlet port 2b4 that introduces the content liquid 4, which is sucked from the storage space S of the container body 3 toward the liquid chamber 2f, into the liquid chamber 2f, and the liquid cylinder wall 2b1 has an air vent 2i4. The liquid cylinder 2b is held in place when the mounting tube 2a4 of the air cylinder 2a is attached to the mouth portion 3a, and the flange 2b2 is sandwiched between the upper end surface of the mouth portion 3a and the lower surface of the cap top wall 2a5.

[0026] A retaining member 2k is attached to and held at the upper end of the hydraulic cylinder 2b. The retaining member 2k abuts against the hydraulic piston 2d, which is held by the stem 2g1 so that it can move up and down, to prevent it from slipping out of the hydraulic cylinder 2b. The retaining member 2k has a cylindrical portion 2k1 whose inner peripheral surface faces the outer peripheral surface of the stem 2g1, and a flange-like portion 2k2 extending radially outward from a vertically intermediate portion of the cylindrical portion 2k1. The lower surface of the flange-like portion 2k2 abuts against the upper surface of the flange 2b2, and the outer peripheral surface of the cylindrical portion 2k1 below the flange-like portion 2k2 abuts against the inner peripheral surface of the hydraulic cylinder wall 2b1. The lower end of a spring 2h abuts against the upper surface of the flange-like portion 2k2. The upper end of the spring 2h abuts against the lower surface of the annular wall 8 of the air piston 2c1. The spring 2h urges the air piston 2c1 upward when the air piston 2c1 descends due to a pressing operation on the pressing head portion 2g2. The air vent passage 2i1 passes between the flange 2b2 of the liquid cylinder 2b and the cap top wall 2a5 of the air cylinder 2a, and between the flange-shaped portion 2k2 of the retaining member 2k and the cap top wall 2a5, in that order, connecting the gap G between the outer circumferential surface of the opening portion 3a and the mounting tube 2a4 of the air cylinder 2a to the spring chamber 2i2. The outside air supply passage 2i has an inner air vent passage 2i3 formed between the inner circumferential surface of the tubular portion 2k1 and the outer circumferential surface of the stem 2g1, and the inner air vent passage 2i3 connects the spring chamber 2i2 to the vent port 2i4.

[0027] An upper cap member 2l is attached to and held at the upper end of the air cylinder wall 2a7. The upper cap member 2l has an annular shape extending radially inward from the upper end of the air cylinder wall 2a7, and the inner peripheral edge of the upper cap member 2l guides the outer peripheral surface of the outer wall 14a of the pressing head 2g2 in the up and down direction as the lifting unit 2g moves up and down.

[0028] When the pressing head portion 2g2 is pressed down against the force of the spring 2h, the liquid piston 2d slides downward on the liquid cylinder 2b, causing the liquid content 4 to flow from the liquid chamber 2f through the inside of the stem 2g1 toward the inlet 16d of the holding tube 16 as shown by the thick arrow in Figure 2, while the air piston 2c1 slides downward on the air cylinder 2a, causing air to flow from the air chamber 2e through the air flow path 2g3 toward the inlet 16d of the holding tube 16 as shown by the white arrow in Figure 2, and the liquid content 4 and air meet and mix at the inlet 16d as they pass through the foaming member 15, becoming foamy and being discharged from the outlet 14e. At this time, the spring chamber 2i2 contracts as the sealing surface 6a of the air piston 2c1 slides downward against the sealing tube 2a1, and the liquid piston 2d moves below the vent hole 2i4, opening the vent hole 2i4. Therefore, when the pressure in the storage space S is lower than the pressure of the outside air, the outside air flows into the storage space S of the container body 3 through the outside air supply path 2i, passing through the gap G, the vent flow path 2i, the spring chamber 2i2, the inner vent flow path 2i3, and the vent hole 2i4 in that order.

[0029] When the pressing operation on the pressing head portion 2g2 is released, the elevating portion 2g rises due to the biasing force of the spring 2h. As the elevating portion 2g rises, the liquid piston 2d slides upward on the liquid cylinder 2b, depressurizing the liquid chamber 2f and drawing the liquid content 4 from the storage space S into the liquid chamber 2f through the liquid inlet 2b4. This suction also depressurizes the storage space S. Furthermore, as the elevating portion 2g rises, the air piston 2c1 slides upward on the air cylinder 2a and depressurizes the air chamber 2e, drawing air from outside the foam dispensing container 1 into the air chamber 2e through the outside air inlet 2a8. At this time, the spring chamber 2i2 expands as the seal surface 6a of the air piston 2c1 slides upward against the seal cylinder 2a1. During this expansion, the liquid piston 2d moves upward to a position where it covers the air vent 2i4, blocking it.

[0030] According to this embodiment, the spring 2h is disposed in the spring chamber 2i2, preventing the liquid 4 from contacting the spring 2h, as would occur in a configuration in which the spring 2h is disposed in the liquid chamber 2f. Furthermore, the spring chamber 2i2 is isolated from the air chamber 2e by the seal tube 2a1, preventing liquid such as water from entering the spring 2h even when air is drawn into the air chamber 2e. Furthermore, the spring chamber 2i2 can be used to form the outside air supply path 2i for replacing the liquid 4 with outside air, simplifying the structure for forming the outside air supply path 2i. Furthermore, because the outside air is drawn into the air cylinder 2a through the gap G between the outer circumferential surface of the opening 3a and the air cylinder 2a through the outside air supply path 2i, the intrusion of liquid such as water into the spring chamber 2i2 along with the outside air is prevented, thereby preventing liquid from contacting the spring 2h.

[0031] The foam-dispensing container 1 of this embodiment may be configured such that the air piston member 2c has a check valve 2n1 that prevents backflow in the air flow path 2g3, as in the second embodiment shown in Fig. 3. This configuration prevents the content liquid 4 from entering the air chamber 2e through the air flow path 2g3, for example, when the foam-dispensing container 1 is stored on its side after use.

[0032] In the second embodiment, the lifting unit 2g has a stem 2g1 extending in the vertical direction on the radially inner side of the seal tube 2a1, and an air piston member 2c having an air piston 2c1 and integrally attached to the upper end of the stem 2g1. The air piston member 2c has a fitting peripheral wall 7 whose outer peripheral surface fits onto the upper end of the spring 2h. The air piston member 2c has a seal peripheral wall 6 having a seal surface 6a, and an annular wall 8 that connects the vertical intermediate portion of the seal peripheral wall 6 to the upper end of the fitting peripheral wall 7 provided on the radially inner side of the seal peripheral wall 6 around the entire periphery. The lifting unit 2g has a push-down head portion 2g2 that is integrally held above the air piston 2c1, and an air flow path 2g3 that is defined by the push-down head portion 2g2, the outer peripheral surface of the seal peripheral wall 6, the upper surface of the annular wall 8, and the inner peripheral surface of the fitting peripheral wall 7. By pressing down the push-down head portion 2g2, air is released from the air chamber 2e to the air flow path 2g. The air piston member 2c has an inner air piston member 2m and an outer air piston member 2n, the inner air piston member 2m having a fitting peripheral wall 7 and an annular wall 8, and is attached integrally to the upper end of the stem 2g1, the outer air piston member 2n having an air piston 2c1, a sealing peripheral wall 6, and a check valve 2n1, and is attached integrally to the outer peripheral edge of the annular wall 8, the check valve 2n1 having an annular shape extending radially inward and downward from a part of the sealing peripheral wall 6 above the annular wall 8, the inner peripheral edge of the check valve 2n1 seating on the push-down head portion 2g2 suppresses backflow in the air flow path 2g3, and the flow of air in the air flow path 2g3 from the air chamber 2e is permitted by the elastic deformation of the check valve 2n1 causing the inner peripheral edge of the check valve 2n1 to move away from the push-down head portion 2g2.

[0033] The annular wall 8 has a flange wall portion 8a1 extending radially outward from the upper end of the fitting peripheral wall 7 and a cylindrical wall portion 8a2 extending upward from the outer periphery of the flange wall portion 8a1. The inner periphery of the sealing peripheral wall 6 has a stepped portion 6b whose diameter expands stepwise downward and a fitting protrusion 6c that protrudes radially inward below the stepped portion 6b. The outer air piston member 2n is attached to the inner air piston member 2m by fitting the outer periphery of the cylindrical wall portion 8a2 between the stepped portion 6b and the fitting protrusion 6c. At this time, the inner periphery of the sealing peripheral wall 6 is in close contact with the outer periphery of the annular wall 8 (the outer periphery of the cylindrical wall portion 8a2). Therefore, the content liquid 4 is prevented from entering the spring chamber 2i2 through the fitting portion. The inner air piston member 2m and the outer air piston member 2n are each formed by, for example, injection molding.

[0034] The foamer pump 2 may have a cover 17 that covers the pressing head portion 2g2, as in the second embodiment, and the cover 17 may be removed when the pump is first used.

[0035] 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]

[0036] 1 Foam dispensing container 2 foamer pump 2a Air Cylinder 2a1 Seal tube 2a2 Fitting cylinder part 2a3 Expanded cylinder part 2a4 mounting tube 2a5 Cap top wall 2a6 Air cylinder bottom wall 2a7 Air cylinder wall 2a8 Outside air intake 2b Liquid cylinder 2b1 Liquid cylinder wall 2b2 flange 2b3 Liquid cylinder bottom wall 2b4 Liquid inlet 2c Air piston member 2c1 Air Piston 2c2 Stem connection part 2d Liquid Piston 2e air chamber 2f liquid chamber 2g Lifting section 2g1 stem 2g2 Pressing head 2g3 Air Flow Channel 2h spring 2i Outside air supply channel 2i1 Ventilation channel 2i2 spring chamber 2i3 Inner ventilation channel 2i4 vents 2j Outside air intake valve 2j1 cylinder 2j2 Valve body 2k retaining member 2k1 Cylindrical part 2k2 flange part 2l Upper cap part 2m inner air piston member 2n Outer air piston member 2n1 check valve 3 Container body 3a Mouth 3b Torso 3b1 shoulder area 4 Content liquid 5 Threaded fitting 6 Seal periphery 6a sealing surface 6b Step 6c Fitting protrusion 7 Fitting peripheral wall 8 Circular Wall 8a1 Flange wall 8a2 Cylinder wall 9 Air piston sliding part 10 Outer annular wall 11 Outer wall 12 Intermediate annular wall 12a Communication port 13 Interlocking Wall 14 Pressing head body 14a Outer wall 14b Top wall 14c Inner wall 14d retaining wall 14e Discharge port 15 Foaming element 16 Holding cylinder 16a Mounting tube 16b Step wall 16c Lower cylinder part 16d Inlet 17 Cover G Gap O center axis S Storage space

Claims

1. an air cylinder attached to the outer circumferential surface of a mouth of a container body having a mouth, a body, and a bottom connected in this order, and held radially outside the mouth of the container body; a liquid cylinder that is held radially inside the mouth portion by being attached to the mouth portion of the air cylinder; an air piston that slides up and down relative to the air cylinder; a liquid piston that slides up and down relative to the liquid cylinder; an air chamber defined by the air cylinder and the air piston; a liquid chamber defined by the liquid cylinder and the liquid piston; a lifting unit that moves up and down together with the air piston and the liquid piston; a spring that generates a biasing force that raises the lifting unit, a foamer pump that mixes the liquid content pressure-fed from the container body through the liquid chamber with air pressure-fed from the air chamber by raising and lowering the lifting part, to form foam and discharge the foam, an outside air supply path for supplying outside air into the container body to replace the content liquid discharged from the container body; The air cylinder has a seal tube whose diameter expands upward, The spring is disposed in a spring chamber defined radially inside the seal cylinder, the air piston has a sealing surface on an inner circumferential surface of the air piston; an upper end of the sealing cylinder contacts the sealing surface to isolate the spring chamber from the air chamber; The outside air supply path has an air flow path that connects the gap between the outer peripheral surface of the opening portion and the air cylinder to the spring chamber through the gap between the air cylinder and the liquid cylinder, the spring chamber, and an air vent provided in the liquid cylinder, and the outside air passes through the air flow path, the spring chamber, and the air vent in this order.

2. the lifting unit has a stem extending in a vertical direction on the radially inner side of the seal cylinder, and an air piston member having the air piston and integrally attached to an upper end of the stem, the air piston member has a fitting peripheral wall whose outer circumferential surface fits onto the upper end of the spring, 2. The foamer pump according to claim 1, wherein an inner peripheral surface of a lower end of the sealing cylinder is fitted onto a lower end of the spring.

3. the air piston member has a sealing peripheral wall having the sealing surface, and an annular wall whose upper end portion is connected over the entire periphery to an upper end portion of the fitting peripheral wall provided radially inward of the sealing peripheral wall, 3. The foamer pump according to claim 2, wherein the lifting unit has a push-down head unit integrally held above the air piston, and an air flow path defined by the push-down head unit, the outer peripheral surface of the sealing peripheral wall, the upper surface of the annular wall, and the inner peripheral surface of the fitting peripheral wall, and when the push-down head unit is pressed down, the air is pressurized from the air chamber through the air flow path, mixed with the liquid content to form foam, and discharged.

4. the lifting unit has a stem extending in a vertical direction on the radially inner side of the seal cylinder, and an air piston member having the air piston and integrally attached to an upper end of the stem, the air piston member has a fitting peripheral wall whose outer circumferential surface fits onto the upper end of the spring, the air piston member has a sealing peripheral wall having the sealing surface, and an annular wall whose vertical intermediate portion of the sealing peripheral wall is connected over the entire periphery to an upper end portion of the fitting peripheral wall provided radially inward of the sealing peripheral wall, The lifting unit has a push-down head unit integrally held on the upper side of the air piston, and an air flow path defined by the push-down head unit, the outer peripheral surface of the sealing peripheral wall, the upper surface of the annular wall, and the inner peripheral surface of the fitting peripheral wall, and by pressing down the push-down head unit, the air is pressure-fed from the air chamber through the air flow path, mixed with the content liquid to form foam, and then discharged, 2. The foamer pump according to claim 1, wherein the air piston member has a check valve for preventing backflow in the air flow passage.

5. The air piston member includes an inner air piston member and an outer air piston member, the inner air piston member has the fitting peripheral wall and the annular wall and is integrally attached to the upper end of the stem; the outer air piston member includes the air piston, the sealing peripheral wall, and a check valve, and is integrally attached to the outer peripheral edge portion of the annular wall; 5. The foamer pump according to claim 4, wherein the check valve has an annular shape extending radially inward from a portion of the sealing peripheral wall above the annular wall, and the inner peripheral edge of the check valve seats on the push-down head portion to suppress backflow in the air flow path, and the flow of air in the air flow path from the air chamber is permitted by the inner peripheral edge of the check valve moving away from the push-down head portion due to elastic deformation of the check valve.

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