Foaming Spout

Abstract

The present invention provides a foam dispenser that uses a spring member composed of a leaf spring. [Solution] A foam dispenser comprising a cylinder section 4, an air piston 5, a liquid piston 6, a lifting section 7, and a spring member 8, wherein the cylinder section 4 comprises an air cylinder section 4a and a liquid cylinder section 4b, the air cylinder section 4a and the air piston 5 partition an air chamber S1, the liquid cylinder section 4b and the liquid piston 6 partition a liquid chamber S2, the lifting section 7 moves up and down with the air piston 5 and the liquid piston 6 by pressing against the biasing force of the spring member 8 and releasing it, mixing liquid L and air to form foam and discharging it, the spring member 8 comprises a mounting section 8a and a leaf spring 8b, the mounting section 8a is mounted on one of the cylinder section 4 and the lifting section 7, the other of the cylinder section 4 and the lifting section 7 has a sliding section 7a, the leaf spring 8b is elastically deformed radially outward by sliding against the sliding section 7a as the lifting section 7 descends, and generates a biasing force as a restoring force from the elastic deformation.

Description

[Technical Field]

[0001] The present invention relates to a foam discharger. [Background Art]

[0002] There has been known a foam discharger which includes a cylinder portion, an air piston, a liquid piston, an elevating portion, and a spring member, wherein the cylinder portion has an air cylinder portion and a liquid cylinder portion, the air cylinder portion has a mounting cap and an air cylinder, the air cylinder is positioned radially outward of the mounting cap, the liquid cylinder portion is held radially inward of a mouth portion of a container by mounting the mounting cap on an outer peripheral surface of the mouth portion, the air piston moves up and down by sliding against an inner peripheral surface of the air cylinder, the liquid piston moves up and down by sliding against an inner peripheral surface of the liquid cylinder portion, the air cylinder portion and the air piston define an air chamber, the liquid cylinder portion and the liquid piston define a liquid chamber, and the elevating portion moves up and down together with the air piston and the liquid piston by a pressing operation against the biasing force of the spring member and the release of the pressing operation, thereby mixing the liquid pressure-fed from the inside of the container through the liquid chamber and the air pressure-fed from the air chamber to form foam and discharge the foam (see, for example, Patent Document 1). [Prior Art Literature] [Patent Literature]

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

[0004] In conventional foam dischargers, the spring member is constituted by a coil spring.

[0005] An object of the present invention is to provide a foam discharger that uses a spring member constituted by a leaf spring. [Means for Solving the Problem]

[0006] One embodiment of the present invention is as follows:

[0007] [Section 1] It has a cylinder section, an air piston, a liquid piston, a lifting section, and a spring member. The cylinder section comprises an air cylinder section and a liquid cylinder section. The aforementioned air cylinder section includes a mounting cap and an air cylinder. The air cylinder is located radially outward of the mounting cap. The liquid cylinder portion is held radially inward of the opening of the container by the mounting cap being attached to the outer circumferential surface of the opening of the container. The air piston moves up and down by sliding against the inner circumferential surface of the air cylinder. The liquid piston moves up and down by sliding against the inner circumferential surface of the liquid cylinder portion. The air cylinder section and the air piston partition the air chamber. The aforementioned liquid cylinder and liquid piston partition the liquid chamber. The lifting mechanism moves up and down, along with the air piston and the liquid piston, by pressing against the biasing force of the spring member and then releasing it, thereby mixing the liquid pumped from the container through the liquid chamber with the air pumped from the air chamber to form foam and discharge it. The spring member has a mounting portion and a leaf spring. The leaf spring extends upward or downward from the mounting portion, The mounting portion is attached to either the cylinder portion or the lifting portion. The other of the cylinder portion and the lifting portion has a sliding portion, The leaf spring is elastically deformed radially outward as the lifting part descends, thereby generating the biasing force as a restoring force from the elastic deformation, in a foam dispenser.

[0008] [Section 2] The sliding portion decreases in diameter as it approaches the mounting portion in the vertical direction, increasing the angle of reduction in diameter. The contact point between the tip of the leaf spring and the sliding part is located radially inward from the base of the leaf spring when the lifting part is in its initial position. The foam dispenser according to item 1, wherein the tip of the leaf spring slides against the sliding part until the lifting part descends from the initial position to the lower limit position.

[0009] [Section 3] The mounting portion of the spring member has an annular shape extending in the circumferential direction. The foam dispenser according to item 1 or 2, wherein the spring member has a plurality of leaf springs arranged in the circumferential direction.

[0010] [Section 4] The lifting mechanism includes a push head, a stem, and an intervening member. The stem has a cylindrical shape that extends upward from within the liquid cylinder portion. The intervening member has the air piston and is interposed between the pressing head and the stem and mounted on the pressing head and the stem. The sliding portion is provided on the intervening member, the foam dispenser according to any one of items 1 to 3.

[0011] [Section 5] The lifting mechanism includes a push head, a stem, and an intervening member. The stem has a cylindrical shape that extends upward from within the liquid cylinder portion. The intervening member has the air piston and is interposed between the pressing head and the stem and mounted on the pressing head and the stem. The mounting portion of the spring member is attached to the intervening member. The sliding portion is provided on the mounting cap, and is a foam dispenser according to any one of items 1 to 3. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a foam dispenser that uses a spring member composed of a leaf spring. [Brief explanation of the drawing]

[0013] [Figure 1] It is a cross-sectional view showing the foam discharge container according to the first embodiment of the present invention in a state before a pressing operation. [Figure 2] It is a cross-sectional view showing the foam discharge container shown in Fig. 1 in a state during a pressing operation. [Figure 3] It is a cross-sectional view showing the foam discharge container according to the second embodiment in a state before a pressing operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present invention will be described by way of example with reference to the accompanying drawings.

[0015] As shown in Fig. 1, in one embodiment of the present invention, the foam discharge container 1 includes a foam discharger 2 and a container 3. The container 3 has a mouth portion 3a, a body portion 3b, and a bottom portion (not shown) connected in this order, and contains a liquid L inside. The mouth portion 3a is formed in a cylindrical shape centered on the central axis O. The body portion 3b has a shoulder region 3b1, and the shoulder region 3b1 extends radially outward from the lower end of the mouth portion 3a. The liquid L is not particularly limited, and is, for example, cosmetics such as liquid soap, liquid cosmetics, and hair styling products.

[0016] In the present embodiment, the upward direction is the direction from the bottom portion toward the mouth portion 3a along the central axis O, the downward direction is the opposite direction, the radial direction is the direction orthogonal to the central axis O, and the circumferential direction is the direction surrounding the central axis O.

[0017] The foam dispenser 2 has a cylinder section 4, an air piston 5, a liquid piston 6, a lifting section 7, and a spring member 8. The cylinder section 4 has an air cylinder section 4a and a liquid cylinder section 4b. The air cylinder section 4a has a mounting cap 4c and an air cylinder 4d, the air cylinder 4d is located radially outside the mounting cap 4c, the liquid cylinder section 4b is held radially inside the mouth 3a by the mounting cap 4c being attached to the outer circumferential surface of the mouth 3a of the container 3, the air piston 5 moves up and down by sliding against the inner circumferential surface of the air cylinder 4d, and the liquid piston 6 moves up and down by sliding against the inner circumferential surface of the liquid cylinder section 4b. The air cylinder section 4a and the air piston 5 partition an air chamber S1, and the liquid cylinder section 4b and the liquid piston 6 partition a liquid chamber S2.

[0018] As shown in Figures 1 and 2, the lifting unit 7 moves up and down with the air piston 5 and liquid piston 6 by being pushed against the biasing force of the spring member 8 and then released, mixing the liquid L pumped from the container 3 through the liquid chamber S2 with the air pumped from the air chamber S1 to form foam and discharge it.

[0019] The spring member 8 has a mounting portion 8a and a leaf spring 8b. The leaf spring 8b extends upward from the mounting portion 8a, which is mounted on the cylinder portion 4. The lifting portion 7 has a sliding portion 7a. As the lifting portion 7 descends, the leaf spring 8b slides against the sliding portion 7a, causing it to elastically deform radially outward, generating a biasing force as a restoring force from the elastic deformation.

[0020] The sliding portion 7a decreases in diameter as it approaches the mounting portion 8a in the vertical direction (i.e., downward), increasing the angle of reduction in diameter. The contact point between the tip (upper end) of the leaf spring 8b and the sliding portion 7a is located radially inward from the base of the leaf spring 8b when the lifting portion 7 is in its initial position. The tip of the leaf spring 8b slides against the sliding portion 7a until the lifting portion 7 descends from its initial position to its lower limit position. With this configuration, the amount of radial displacement of the leaf spring 8b can be suppressed, and the occurrence of sagging (reduction in biasing force due to plastic deformation) can be suppressed.

[0021] The mounting portion 8a of the spring member 8 is an annular shape extending in the circumferential direction, and the spring member 8 has a plurality of leaf springs 8b arranged in the circumferential direction. With the above configuration, variations in the circumferential direction of the biasing force can be suppressed.

[0022] The leaf spring 8b has a plate body 8b1 and a pair of longitudinal ribs 8b2. The plate body 8b1 has thickness in the radial direction, and the pair of longitudinal ribs 8b2 project radially outward separately from both circumferential edges of the plate body 8b1, extending from the upper surface of the mounting portion 8a to the tip of the leaf spring 8b. The plate body 8b1 has a base portion and a tip portion connected together. The base portion has a curved shape that projects radially outward when viewed in the circumferential direction, and the tip portion has a curved shape that projects radially inward when viewed in the circumferential direction. The projection width of the pair of longitudinal ribs 8b2 is greater for the portion projecting radially outward from the base portion than for the portion projecting radially outward from the tip portion. With the above configuration, the occurrence of sagging can be further suppressed.

[0023] The lifting section 7 has a pressing head 7b, a stem 7c, and an intervening member 7d. The stem 7c is cylindrical and extends upward from within the liquid cylinder section 4b. The intervening member 7d has an air piston 5 and is interposed between the pressing head 7b and the stem 7c, and is mounted on the pressing head 7b and the stem 7c. The sliding part 7a is provided on the intervening member 7d. The pressing head 7b has an operated part 7b1 and a discharge port 7b2. The operated part 7b1 receives a pressing operation, and the discharge port 7b2 discharges foam.

[0024] The intervening member 7d has a fitted inner cylinder 7d1, an outer cylinder 7d2, an annular connecting portion 7d3, a rib 7d4, and an air piston connecting portion 7d5. The fitted inner cylinder 7d1 is fitted and mounted on the inner circumferential surface of the stem 7c, the outer cylinder 7d2 extends vertically radially outward from the stem 7c, the annular connecting portion 7d3 extends from the upper end of the fitted inner cylinder 7d1 to the upper-lower middle portion of the outer cylinder 7d2, the sliding portion 7a is cylindrical in shape and extends upward from the lower end of the outer cylinder 7d2 while expanding in diameter, the rib 7d4 extends radially from the outer circumferential surface of the outer cylinder 7d2 to the inner circumferential surface of the sliding portion 7a and also extends downward from the upper end of the outer cylinder 7d2, and the air piston connecting portion 7d5 extends from the upper end of the sliding portion 7a to the inner circumferential surface of the air piston 5. The intervening member 7d has a plurality of ribs 7d4 arranged at equal intervals in the circumferential direction. From the viewpoint of enhancing the effect of suppressing deformation of the sliding part 7a, it is preferable to provide five or more ribs 7d4. From the viewpoint of suppressing circumferential variation of the biasing force, it is preferable to provide more leaf springs 8b than the number of ribs 7d4.

[0025] The liquid cylinder section 4b has a liquid cylinder member 4e and a retaining member 4f. The liquid cylinder member 4e has a liquid cylinder 4e1 and a flange 4e2. The liquid piston 6 slides vertically against the inner circumferential surface of the liquid cylinder 4e1. The flange 4e2 extends radially outward from the upper end of the liquid cylinder 4e1. The retaining member 4f has a flange section 4f1, a lower cylindrical section 4f2, and an upper cylindrical section 4f3. The flange section 4f1 is superimposed on the upper surface of the flange 4e2. The lower cylindrical section 4f2 extends downward from the inner circumferential edge of the flange section 4f1 and is mounted on the upper end of the inner circumferential surface of the liquid cylinder 4e1. The upper cylindrical section 4f3 extends upward from the inner circumferential edge of the flange section 4f1. The stem 7c is located radially inward of the retaining member 4f. The mounting portion 8a of the spring member 8 is mounted on the outer circumferential surface of the upper cylindrical section 4f3 and supported by the upper surface of the flange section 4f1.

[0026] The mounting cap 4c has a mounting cylinder 4c1 and an annular top wall 4c2. The mounting cylinder 4c1 is mounted on the outer circumferential surface of the opening 3a, and the annular top wall 4c2 extends radially inward from the upper end of the mounting cylinder 4c1 and extends continuously in the circumferential direction, forming an annular shape. The flange 4e2 and flange portion 4f1 are sandwiched and held between the upper surface of the opening 3a and the lower surface of the annular top wall 4c2.

[0027] The foam dispenser 2 has an upstream backflow suppression section 9 and a downstream backflow suppression section 10. The upstream backflow suppression section 9 suppresses the backflow of liquid L from the liquid chamber S2 into the container 3, and the downstream backflow suppression section 10 suppresses the backflow of liquid L from the stem 7c into the liquid chamber S2. The lifting section 7 has a piston guide 7e, which is fitted and mounted on the inner circumferential surface of the stem 7c. The liquid piston 6 is held by the stem 7c and the liquid piston 6 guide so that it can move relative to the stem 7c and the piston guide 7e in the vertical direction. The liquid piston 6 has a contacted portion 6a, and the piston guide 7e has a contact portion 7e1. The contact portion 7e1 contacts the contacted portion 6a as the lifting section 7 rises, closing the flow path of liquid L and suppressing the backflow of liquid L. The contact portion 7e1 separates from the contacted portion 6a as the lifting section 7 descends, opening the flow path of liquid L. The lifting section 7 has a liquid passage C2, which extends from the downstream backflow suppression section 10 through the inside of the piston guide 7e and stem 7c to the upper end of the fitted inner cylinder 7d1 of the intervening member 7d and merges with the air passage C1. In other words, the junction 12 of the liquid L passage and the air passage C1 is located at the upper end of the fitted inner cylinder 7d1. The upstream backflow suppression section 9 is composed of an elastic valve body, but is not limited to this.

[0028] The air cylinder section 4a has an annular bottom wall 4g, which extends radially outward from the lower end of the mounting cylinder 4c1 of the mounting cap 4c and connects to the lower end of the air cylinder 4d, facing the shoulder region 3b1 of the container 3. The annular bottom wall 4g has an outside air inlet 4g1, and the foam discharger 2 has an outside air inlet valve 11, which is located inside the air chamber S1 and allows outside air to be introduced into the air chamber S1 from the outside air inlet 4g1, while suppressing backflow of air from the air chamber S1 to the outside air inlet 4g1. The outside air inlet valve 11 has a support cylinder 11a and an annular valve body 11b, the support cylinder 11a is mounted on the outer circumferential surface of the mounting cylinder 4c1, and the annular valve body 11b extends radially outward from the support cylinder 11a and forms an annular shape extending in the circumferential direction. The outside air intake valve 11 allows air to be introduced by the elastic upward deformation of its annular valve body 11b, and suppresses backflow of air by the annular valve body 11b contacting the upper surface of the annular bottom wall 4g.

[0029] The lifting section 7 has an air passage C1, which is divided between the pressing head 7b and the intervening member 7d by the pressing head 7b and the intervening member 7d. The intervening member 7d has a fitting cylindrical portion 7d6 that extends upward from the air piston connecting portion 7d5, and the pressing head 7b is fitted and mounted into the fitting cylindrical portion 7d6. The air piston connecting portion 7d5 has a through-hole 7d7, which penetrates the air piston connecting portion 7d5 radially inward from the fitting cylindrical portion 7d6, and the air passage C1 extends from the through-hole 7d7 to the confluence portion 12.

[0030] The pressing head 7b has a foaming member 13 inside, and the liquid L and air that merge at the confluence section 12 pass through the foaming member 13 to become foam, which is then discharged from the discharge port 7b2.

[0031] The air cylinder section 4a has a guide tube 4h, and the air piston connecting section 7d5 has a guided tube 7d8, the guided tube 7d8 is located radially inward from the through-hole 7d7, the guide tube 4h extends upward from the annular top wall 4c2 while expanding in diameter, and the inner circumferential surface of the guided tube 7d8 is guided by sliding downward against the upper end of the outer circumferential surface of the guide tube 4h as the lifting section 7 descends. The air chamber S1 is partitioned by the guide tube 4h, the mounting cap 4c, the annular bottom wall 4g, the air cylinder 4d, the air piston 5, and the air piston connecting section 7d5.

[0032] The foam dispenser 2 has an outside air supply passage C3, which supplies outside air into the container 3 as the liquid L in the container 3 is discharged. The guide cylinder 4h, guided cylinder 7d8, sliding part 7a, stem 7c, and retaining member 4f partition the outside air chamber S3. The outside air supply passage C3 has an upstream passage C3a, an outside air chamber S3, and a downstream passage C3b. The upstream passage C3a allows outside air to flow to the outside air chamber S3 through the space between the mounting cap 4c and flange 4e2 and flange part 4f1. The liquid cylinder 4e1 has an outside air supply port 4e3, which penetrates the liquid cylinder 4e1. The downstream passage C3b also has an outside air supply port 4e3, which allows outside air to flow from the outside air chamber S3 through the space between the stem 7c and retaining member 4f, and through the outside air supply port 4e3 into the container 3. The spring member 8 is located inside the outside air chamber S3. The outside air supply port 4e3 is closed by the liquid piston 6 when the lifting unit 7 is in its initial position, and is opened when the lifting unit 7 descends.

[0033] When the lifting section 7 is lowered by a pressing operation, liquid L is sent from the liquid chamber S2 through the liquid channel C2 to the confluence section 12, and air is sent from the air chamber S1 through the air channel C1 to the confluence section 12. The liquid L and air that merge at the confluence section 12 pass through the foaming member 13 to form foam, which is then discharged from the discharge port 7b2. At this time, backflow of liquid L from the liquid chamber S2 into the container 3 is suppressed by the upstream backflow suppression section 9, and backflow of air from the air chamber S1 to the outside is suppressed by the outside air introduction valve 11.

[0034] When the pressing operation is released, the lifting section 7 rises due to the biasing force of the spring member 8, drawing liquid L from inside the container 3 into the liquid chamber S2, and outside air is drawn into the air chamber S1. At this time, backflow of liquid L from inside the stem 7c into the liquid chamber S2 is suppressed by the downstream backflow suppression section 10. Also at this time, the negative pressure generated inside the container 3 draws outside air into the container 3 through the outside air supply passage C3.

[0035] In the first embodiment, the sliding portion 7a is provided on the intervening member 7d, but it is not limited to this, and may be provided on the mounting cap 4c, for example, as shown in the second embodiment in Figure 3. In this case, the mounting portion 8a of the spring member 8 can be mounted on the intervening member 7d. In this case, the configuration is the same as in the first embodiment, except that the positional relationship between the sliding portion 7a and the spring member 8 is reversed in the vertical direction. With such a configuration, a foam dispenser 2 using a spring member 8 made of a leaf spring 8b can also be realized.

[0036] In the second embodiment, the mounting portion 8a has a supported portion 8a1 and a fitting projection 8a2. The supported portion 8a1 is supported by the lower surface of the air piston connecting portion 7d5, and the fitting projection 8a2 extends upward from the radially inner end of the supported portion 8a1, passes through the through-hole 7d7, and is fitted and mounted to the lower end of the fitting cylindrical portion 7d6. The leaf spring 8b extends downward from the mounting portion 8a (the radially inner end of the supported portion 8a1).

[0037] The supported portion 8a1 has an annular shape that extends continuously in the circumferential direction, the air piston connecting portion 7d5 has a plurality of through-holes 7d7, the mounting portion 8a has a plurality of fitting projections 8a2, and the plurality of fitting projections 8a2 pass through the plurality of through-holes 7d7 separately. The spring member 8 has a plurality of leaf springs 8b arranged in the circumferential direction.

[0038] The sliding portion 7a is composed of the portion of the mounting cap 4c that extends downward from the upper end of the mounting cylinder 4c1, and its diameter decreases while increasing the angle of reduction as it approaches the mounting portion 8a in the vertical direction (i.e., upward).

[0039] The leaf spring 8b has a plate body 8b1 and a pair of longitudinal ribs 8b2. The plate body 8b1 has thickness in the radial direction, and the pair of longitudinal ribs 8b2 protrude separately radially outward from both circumferential edges of the plate body 8b1, extending from the lower surface of the mounting portion 8a to the vertical middle portion of the leaf spring 8b.

[0040] In the first and second embodiments, the spring member 8 is made of resin, and all components constituting the foam dispensing container 1 are made of resin. Therefore, the foam dispensing container 1 has good recyclability. Note that the foam dispensing container 1 is not limited to being made of resin, and may be formed using materials other than resin.

[0041] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and the embodiments described above can be modified in various ways without departing from the spirit of the present invention. [Explanation of Symbols]

[0042] 1 Foam dispensing container 2 Foam dispenser 3 containers 3a Mouth 3b Torso 3b1 shoulder area 4 Cylinder section 4a Air cylinder section 4b Liquid cylinder section 4c mounting cap 4c1 mounting tube 4c2 Ring apex 4d air cylinder 4e Liquid cylinder component 4e1 Liquid Cylinder 4e2 flange 4e3 Outside air supply port 4f Retaining member 4f1 Flange section 4f2 Lower cylinder part 4f3 Upper cylinder part 4g annular base wall 4g1 Outdoor air intake 4h guide tube 5 Air piston 6 Liquid pistons 6a Contacted part 7. Lifting section 7a Sliding part 7b Press head 7b1 Operated part 7b2 Discharge port 7c stem 7d Intervening member 7d1 Fitting inner cylinder 7d2 outer cylinder 7d3 Annular connection section 7d4 Rib 7d5 Air piston connection 7d6 Fitting cylinder part 7d7 Penetration 7d8 Guided tube 7e Piston Guide 7e1 Contact part 8 Spring member 8a Mounting part 8a1 Supported part 8a2 Fitting protrusion 8b Leaf spring 8b1 plate 8b2 Vertical ribs 9 Upstream backflow suppression section 10 Downstream backflow suppression section 11. Outdoor air intake valve 11a Support tube 11b Annular valve body 12. Confluence 13 Whisk component C1 Airflow channel C2 liquid flow path C3 Outside air supply channel C3a Upstream flow path C3b Downstream flow path S1 Air Chamber S2 liquid chamber S3 Outdoor Chamber L liquid O center axis

Claims

1. It has a cylinder section, an air piston, a liquid piston, a lifting section, and a spring member. The cylinder section comprises an air cylinder section and a liquid cylinder section. The aforementioned air cylinder section includes a mounting cap and an air cylinder. The air cylinder is located radially outward of the mounting cap. The liquid cylinder portion is held radially inward of the opening of the container by the mounting cap being attached to the outer circumferential surface of the opening of the container. The air piston moves up and down by sliding against the inner circumferential surface of the air cylinder. The liquid piston moves up and down by sliding against the inner circumferential surface of the liquid cylinder portion. The air cylinder section and the air piston partition the air chamber. The aforementioned liquid cylinder and liquid piston partition the liquid chamber. The lifting mechanism moves up and down, along with the air piston and the liquid piston, by pressing against the biasing force of the spring member and then releasing it, thereby mixing the liquid pumped from the container through the liquid chamber with the air pumped from the air chamber to form foam and discharge it. The spring member has a mounting portion and a leaf spring. The leaf spring extends upward or downward from the mounting portion, The mounting portion is attached to either the cylinder portion or the lifting portion. The other of the cylinder portion and the lifting portion has a sliding portion, The leaf spring is elastically deformed radially outward as the lifting part descends, thereby generating the biasing force as a restoring force from the elastic deformation, in a foam dispenser.

2. The sliding portion decreases in diameter as it approaches the mounting portion in the vertical direction, increasing the angle of reduction in diameter. The contact point between the tip of the leaf spring and the sliding part is located radially inward from the base of the leaf spring when the lifting part is in its initial position. The foam dispenser according to claim 1, wherein the tip of the leaf spring slides against the sliding part until the lifting part descends from the initial position to the lower limit position.

3. The mounting portion of the spring member has an annular shape extending in the circumferential direction. The foam dispenser according to claim 1, wherein the spring member has a plurality of leaf springs arranged in the circumferential direction.

4. The lifting mechanism includes a push head, a stem, and an intervening member. The stem has a cylindrical shape that extends upward from within the liquid cylinder portion. The intervening member has the air piston and is interposed between the pressing head and the stem and mounted on the pressing head and the stem. The foam dispenser according to claim 1, wherein the sliding portion is provided on the intervening member.

5. The lifting mechanism includes a push head, a stem, and an intervening member. The stem has a cylindrical shape that extends upward from within the liquid cylinder portion. The intervening member has the air piston and is interposed between the pressing head and the stem and mounted on the pressing head and the stem. The mounting portion of the spring member is attached to the intervening member. The foam dispenser according to claim 1, wherein the sliding portion is provided on the mounting cap.

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