JP7099927B2 - Foam ejector - Google Patents

Description

The present invention relates to a foam ejector.

Nozzle heads that project nozzles to the outside
It is equipped with a pump configured to suck up the liquid in the container by moving the nozzle head up and down and mix it with air to pump the mixed fluid to the nozzle head side, and foam the mixed fluid and eject it from the nozzle. It is a foam ejector that has the function of sucking back (sucking back) the residue in the nozzle after ejection.
An elastic dome having an internal passage from the pump to the tip of the nozzle inside the nozzle head and communicating with the internal passage through a communication hole formed in the top wall of the head nozzle was mounted on the top wall. Is known (Patent Document 1).

JP-A-2017-132522

The foam ejector of Patent Document 1 has a problem that the efficiency of suckback is not good because the space where the elastic dome is displaced is wide.
In addition, there is also the inconvenience that the foam drawn into the elastic dome during suckback liquefies while staying for a long time and mixes with the foam generated in the next ejection operation, resulting in coarse foam quality.

A first object of the present invention is to provide a foam ejector having good suckback efficiency.
A second object of the present invention is to provide a foam ejector having good foam quality.

The first means is a head member 2 for projecting the nozzle 12 to the outside of the side, and
The head member 2 is provided with a discharger main body 60 configured to suck up the liquid in the container by moving up and down and mix it with air to pump the mixed fluid to the head member 2 side.
A foam ejector having a function of foaming the mixed fluid and ejecting it from the nozzle and sucking back the residue in the nozzle after the ejection.
The head member 2 is
A nozzle head 4 including the nozzle 12 and a built-in internal passage P from the ejector main body 60 to the tip of the nozzle 12.
It is formed of a piston head 30 attached to the top wall 6 of the nozzle head 4 so as to be able to move up and down.
The nozzle head 4 has a cylinder cylinder portion 16 communicating with the internal passage P standing upright from the top wall 6.
The piston head 30 is positioned above the internal flow path P from the back surface side of the piston head, and is fitted into the inner surface of the cylinder cylinder portion 16 in a liquid-tight manner so as to be able to move up and down. And has a top surface T for pushing down.
An elastic urging means B for urging the piston head 30 upward is provided between the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4.

In this means, as shown in FIG. 1, the piston head 30 is attached to the top wall 6 of the nozzle head 4 so as to be able to move up and down, and the piston 38 of the piston head 30 can be moved up and down in the cylinder cylinder portion 16 of the nozzle head 4. It is configured to perform suckback by mating. Therefore, the efficiency of the suckback is good, and the foam can be sucked in quickly and deeply after the liquid is ejected.

The second means has the first means, and the internal passage P is composed of a vertical passage portion P1 continuous with the discharger main body 60 and a horizontal passage portion P2 extending from the vertical passage portion to the tip of the nozzle 12. ,
The lateral passage portion P2 is formed along the back surface of the top wall 6 of the nozzle head 4, and is continuous with the cylinder cylinder portion 16 via a communication hole 14 formed in the top wall 6.

In this means, as shown in FIG. 2, the internal passage P is a horizontal passage portion continuous from the vertical passage portion P1 continuous with the discharger main body 60 to the nozzle 12 along the back surface of the top wall 6 of the nozzle head 4. P2 is extended. Further, the communication hole 14 formed in the top wall 6 is continuous with the cylinder cylinder portion 16. In this configuration, the suckback flow path for drawing in the foam is formed by the communication hole 14 and the cylinder cylinder portion 16, and the structure is such that the foam is liquefied and does not easily stay, so that the foam is foamed at the next ejection. There is little risk of deterioration of foam quality when mixed with.

The third means has a first means or a second means, and the guide cylinder portion 9 for guiding the raising and lowering of the piston head 30 is erected from the top wall 6 of the nozzle head 4.

In this means, as shown in FIG. 1, since the guide cylinder portion 9 for guiding the ascending / descending of the piston head 30 stands up from the top wall 6 of the nozzle head 4, even if the user tilts the nozzle head slightly with respect to the vertical. Even if the piston 38 is pushed in the vertical direction, the piston 38 does not move diagonally, and stable ascending / descending operation is possible.

The fourth means has a third means, and the base portion 32 in which the piston head 30 is fitted with the fitting peripheral wall 40b formed around the bottom wall 34 in the guide cylinder portion 9. And the pressing portion 50 covering the upper surface of the base portion 32 are connected via the hinge portion 48.

In this means, as shown in FIG. 1, the piston head 30 is fitted into the guide cylinder portion 9 with a fitting peripheral wall 40b formed around the bottom wall 34, and a base portion 32 thereof. The pressing portion 50 covering the upper surface of the 32 is connected via the hinge portion 48. Therefore, the number of parts can be reduced.

The fifth means has any one of the first to fourth means, and the elastic urging means B is integrated from one of the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4. It was formed by an elastic plate portion 46 that was projected and pressed against the other.

In this means, the elastic urging means B is formed by an elastic plate portion 46 that is integrally projected from one of the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4 and is pressed against the other. is doing. According to this configuration, the suckback function can be realized without increasing the number of members.

According to the invention according to the first means, since the sackback is performed by fitting the piston 38 of the piston head 30 in the cylinder cylinder portion 16 of the nozzle head 4 so as to be able to move up and down, the sackback efficiency is high and the liquid is liquid. The foam can be sucked in quickly and deeply after the eruption of.
According to the invention according to the second means, in the internal passage P, a horizontal passage portion P2 continuous with the nozzle 12 extends from a vertical passage portion P1 continuous with the discharger main body 60, and the horizontal passage portion P2 is the said. It is formed along the back surface of the top wall 6 of the nozzle head 4, is continuous with the cylinder cylinder portion 16 through a communication hole 14 formed in the top wall 6, and is a flow for sucking back for drawing bubbles. Since the path is formed by the communication hole 14 and the cylinder cylinder portion 16, there is little possibility that the quality of the foam at the time of the next ejection will deteriorate.
According to the invention according to the third means, since the guide cylinder portion 9 for guiding the ascending / descending of the piston head 30 stands up from the top wall 6 of the nozzle head 4, the piston 38 does not shake diagonally and is stable. Can be lifted and lowered.
According to the invention according to the fourth means, the piston head 30 is fitted into the guide cylinder portion 9 with a fitting peripheral wall 40b formed around the bottom wall 34, and a base portion 32 thereof. Since the pressing portion 50 covering the upper surface of the portion 32 is connected via the hinge portion 48, the number of parts can be reduced.
According to the invention according to the fifth means, the elastic urging means B is integrally projected from one of the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4, and is pressed against the other. Since it is formed of the elastic plate portion 46, the suckback function can be realized without increasing the number of members.

It is a vertical sectional view of the embodiment of the foam discharger of this invention. It is an enlarged view of the main part of the foam discharger of FIG. FIG. 3 is a cross-sectional view of the foam ejector of FIG. 2 in the III-III direction. It is explanatory drawing of the 1st stage of the ejection work of the foam ejector of FIG. It is explanatory drawing of the 2nd stage of the ejection work of the foam ejector of FIG. It is explanatory drawing of the 3rd stage of the discharge operation of the foam discharger of FIG. It is explanatory drawing of the 4th stage of the ejection work of the foam ejector of FIG.

1 to 7 show a foam ejector according to the first embodiment of the present invention.
This foam ejector is formed by the head member 2 and the ejector main body 60.

As shown in FIG. 1, the head member 2 is composed of a nozzle head 4 and a piston head 30. The head member 2 can be formed of, for example, a synthetic resin.

In the nozzle head 4, a mounting cylinder portion 8 to the ejector main body 60 is vertically provided from a part of the top wall 6 (central portion in the illustrated example). Further, as shown in FIG. 2, the guide cylinder portion 9 stands up from the outer peripheral portion of the top wall 6, and the extension cylinder portion 10 extends downward from the lower end of the guide cylinder portion 9. A locking projection 9a is provided around the inner surface of the upper end portion of the guide cylinder portion 9. Further, a cover cylinder portion 11 surrounding the mounting cylinder portion 8 hangs down from the back surface of the top wall 6 between the mounting cylinder portion 8 and the extension cylinder portion 10.
In the present embodiment, the foaming means F is built in the lower part of the mounting cylinder portion 8.
From the upper part of the mounting cylinder portion 8, the nozzle 12 protrudes forward through the cover cylinder portion 11 and the extension cylinder portion 10. The upper portion of the cylinder wall of the nozzle 12 is formed continuously with the top wall 6.
In the present specification, the left side of FIG. 1 is referred to as “front” and the right side of FIG. 1 is referred to as “rear”.
The nozzle 12 in the illustrated example is formed by a nozzle body 12a that extends linearly forward and a bent cylinder portion 12b that bends downward.
An internal passage P is formed by a vertical passage portion P1 formed inside the mounting cylinder portion 8 and a horizontal passage portion P2 formed inside the nozzle 12. A communication hole 14 is opened in the upper top wall 6 portion of the vertical passage portion P1.
A straight cylinder-shaped cylinder cylinder portion 16 stands up from the hole edge of the communication hole 14.

The piston head 30 is vertically attached to the top wall 6 of the nozzle head 4 in a state of being urged upward by the elastic urging means B.
The piston head 30 has a top surface T for pushing down.
Further, the piston 38 hanging from the bottom wall 34 of the piston head 30 is fitted into the inner surface of the cylinder cylinder portion 16 of the nozzle head 4 in a liquid-tight manner so as to be able to move up and down. By raising and lowering the piston 38, bubbles can be sucked back from the tip end side of the nozzle 12.
In the state shown in FIG. 2 (initial state), the piston 38 has an insertion allowance d1 between the height of the top wall 6 and the piston 38, and is fitted into the upper part of the cylinder cylinder portion 16. .. That is, the piston 38 is arranged above the internal flow path P.
Further, a seal ridge 38a capable of liquid-tightly sliding and contacting the inner surface of the cylinder cylinder portion 16 is provided around the lower portion of the outer peripheral surface of the piston 38.
Further, the piston 38 of the present embodiment is formed in a boss shape protruding downward from the central portion of the bottom wall 34, but the structure thereof can be appropriately changed.

In a suitable illustrated example, as shown in FIG. 2, the piston head 30 is integrally formed with a base portion 32 and a pressing portion 50 via a hinge portion 48.
The base portion 32 is provided with a double tubular annular ridge 36 at the center of the bottom wall 34, and the inner cylinder portion of the annular ridge is extended downward to form a bottomed tubular piston 38. There is.
As shown in FIG. 4, the annular raised portion 36 has a size corresponding to the inner and outer diameters of the cylinder cylinder portion 16 so that the cylinder cylinder portion 16 can be inserted from the lower side.
Further, as shown in FIG. 2, a double peripheral wall portion 40 is provided around the peripheral portion of the base portion 32.
The double peripheral wall portion 40 includes an upright peripheral wall 40a that stands up from the peripheral end of the bottom wall 34, and a fitting peripheral wall 40b that is folded outward and downward from the upper end of the upright peripheral wall 40a. The fitting peripheral wall 40b is formed vertically longer than the standing peripheral wall 40a. A descending allowance d2 is provided between the lower end of the fitting peripheral wall 40b and the top wall 6 of the nozzle head 4. The descending allowance d2 may be equal to or shorter than the insertion allowance d1 of the piston 38.
The fitting peripheral wall 40b is fitted to the inner surface of the guide cylinder portion 9 so as to be able to move up and down.
On the outer surface of the lower end portion of the fitting peripheral wall 40b, a retaining ridge that can be locked to the lower surface of the locking projection 9a of the guide cylinder portion 9 is provided around the outer surface.
In the illustrated example, the upper end surface of the double peripheral wall portion 40 and the upper end surface of the annular raised portion 36 are provided so as to be flush with each other on the same horizontal plane. Further, the upper end surface of the double peripheral wall portion 40 is formed to be wide, and a short cylindrical locking rib 42 is projected upward from the intermediate portion in the width direction of the upper end surface.
Further, a plurality of reinforcing portions 44 are formed at equal intervals in the entire circumferential direction so as to be continuous with the inner surface of the locking rib and the inner peripheral portion of the upper end surface of the double peripheral wall portion 40 (see FIG. 3). This is to prevent the pressing portion 50 from laterally shifting with respect to the base portion 32 even if the user pushes the pressing portion 50 diagonally with respect to the vertical direction.
An elastic urging means B is provided between the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4.
In the present embodiment, a die-cutting hole 45 is formed in the bottom wall portion between the annular ridge portion 36 and the double peripheral wall portion 40, and the die-cutting hole 45 is formed as the elastic urging means B when viewed from above. An elastic plate portion 46 that projects diagonally downward from a part of the edge portion (base end portion e1) of the die-cutting hole 45 so as not to deviate from the contour of the hole 45 is provided as a leaf spring, and the tip of the elastic plate portion 46 is provided. The portion e2 is pressed against the top wall 6 of the nozzle head 4 (see FIG. 2). By doing so, the structure of the piston head 30 including the elastic plate portion 46 can be integrally molded by mold molding.
However, there is also a configuration in which the elastic plate portion is projected diagonally downward from the bottom wall 34 of the piston head 30 by omitting the die-cutting hole, and a configuration in which the elastic plate portion is projected diagonally upward from the top wall 6 of the nozzle head 4. It is included in the technical scope of the present invention.
Further, the elastic urging means B may have any structure as long as it has a function as a leaf spring acting between the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4, for example, a spiral shape or the like. It may be an elastic body. Further, the elastic urging means B may be an elastic body separate from the piston head 30 and the nozzle head 4.
In the illustrated example, as shown in FIG. 3, a pair of fan-shaped die-cutting holes 45 are opened in the bottom wall 34 of the piston head 30, and a pair of elastic plates are oriented in the same circumferential direction from the corresponding edges of the die-cutting holes 45. The part 46 is projected. By doing so, the piston head 30 can be stably moved up and down due to the bending deformation of the elastic plate portion 46. Thereby, the suckback action can be achieved.
However, the number and shape of the elastic plate portion and the die-cutting hole can be appropriately changed. In particular, by setting the number and thickness of the elastic plate portions 46, the relationship between the vertical operation of the piston 38 and the resistance with the sackback cylinder cylinder portion 16 can be finely adjusted, which is advantageous in terms of design.
A structure in which the tip portion e2 of the elastic plate portion protruding from one wall portion of the bottom wall 34 of the piston head 30 and the top wall 6 of the nozzle head 4 abuts against a stopper (not shown) provided on the other wall portion. It may be adopted. By doing so, the amount of deformation of the elastic plate portion can be regulated, and the magnitude of the elastic force of the elastic plate portion can be adjusted. The stopper may be a convex stopper protruding from the other wall portion, or may be a concave stopper (stopper groove) into which the tip portion of the elastic plate portion is fitted.
In this embodiment, the elastic force of the elastic plate portion 46 is designed to be weaker than the elastic force of the coil spring (not shown) of the actuating member 63 described later.

In order to realize the suckback function, as a modification of the elastic dome of Patent Document 1 described above, for example, a part of the push-down dome attached to the top surface of the nozzle head 4 is formed in a thin bellows portion. The configuration is conceivable. However, this may damage the bellows and allow bubbles to leak to the outside. In the present embodiment, since the elastic plate portion 46 that can be flexed and deformed is projected from the lower surface of the piston head, the possibility that the deformed portion is damaged is low, and even if the deformed portion is damaged, bubbles do not leak to the outside. ..

In the present embodiment, the pressing portion 50 connects the peripheral end portion of the pressing plate whose upper surface is the top surface T for pressing to the end portion of the upper surface of the base portion 32 via the hinge portion 48. The base portion 32 and the pressing portion 50 are integrally molded in a mold in the unfolded state, and as shown in FIG. 1, the pressing portion 50 is formed so as to be overlapped on the base portion 32, whereby the number of members is increased. Can be reduced.
However, these structures can be appropriately changed, and a structure in which the pressing portion 50 and the base portion 32 are separately molded is not excluded from the technical scope of the present invention.
In the illustrated example, as shown in FIG. 2, the engaging ring 52 is hung from the peripheral end of the pressing plate 51 that bulges upward, and the engaging ring 52 is fitted to the outer periphery of the locking rib 42. ..

The discharger main body 60 has a conventionally known configuration, and is connected to the head member 2. The liquid is sucked up from the container body 100 by the vertical movement of the head member 2 with respect to the discharger main body 60, mixed with air, and mixed fluid. Any configuration may be used as long as it can be pumped to the head member 2 side.
As a preferred embodiment, the discharger main body 60 of the present embodiment includes a mounting member 62, a pump cylinder 66, and an operating member 63.
The mounting member 62 erects a guide cylinder portion 62b from a mounting cylinder portion 62a for fitting to the mouth and neck portion of the container body 100 via an inward flange. The guide cylinder portion 62b guides the raising and lowering of the stem 64, which will be described later. Further, an outside air introduction path (not shown) is provided between the stem 64 and the guide cylinder portion 62b, or between the mouth neck portion and the mounting cylinder portion 62a.
The pump cylinder 66 has a small-diameter liquid cylinder 66b hanging from a large-sized air cylinder 66a hanging from the mounting member 62, and a mounting cylinder portion 68 is vertically installed from the lower end of the liquid cylinder 66b. is doing. The upper end of the suction pipe 70 is fitted in the mounting cylinder.
The actuating member 63 includes a stem 64 shown in FIG. 1, an air piston and a liquid piston (not shown), and is fitted to the upper end portion of the stem 64 at the lower portion of the mounting cylinder portion 8.
The stem 64 is inserted into the pump cylinder 66 via the inside of the guide cylinder portion 62b. A liquid piston that slides in the liquid cylinder 66b is fitted in the lower end of the stem 64, and air that slides in the air cylinder 66a is fitted on the outer surface of the intermediate portion in the vertical direction of the stem 64. The pistons are linked so that they can move up and down. A coil spring (not shown) is interposed between the liquid piston and the lower portion of the pump cylinder to urge the operating member 63 upward.
When this operating member descends with respect to the pump cylinder 66, the liquid piston and the air piston descend, and the liquid in the liquid cylinder 66b and the air in the air cylinder 66a are checked valves (not shown). Is sent to the upper half side of the stem 64, mixed at the confluence in the upper half portion, and the mixed fluid is pumped into the mounting cylinder portion 8.
In the illustrated example, the mixed fluid is foamed by the foaming means F arranged in the mounting cylinder portion. However, the foaming means F may be arranged in the discharger main body 60.
Further, when the operating member 63 rises with respect to the pump cylinder 66, the liquid in the container body 100 is sucked into the liquid cylinder 66b via another check valve (not shown), and the outside air is further discharged. It is sucked into the air cylinder 66a via an outside air introduction valve (not shown).

In the above configuration, when the top surface T of the piston head 30 is pushed down from the state of FIG. 1, the piston head 30 descends with respect to the nozzle head 4 due to the bending deformation of the elastic plate portion 46. As a result, the piston 38 of the piston head 30 is inserted all the way into the cylinder cylinder portion 16 of the nozzle head 4. At this time, since the fitting peripheral wall 40b slides along the inner surface of the guide cylinder portion 9, the piston head 30 can be stably lowered.
In particular, stable operation is possible as compared with a configuration that can be compressed diagonally like the above-mentioned bellows type operation unit (dome).
Further, the elastic plate portion 46 is bent and deformed, and there is little concern about cracking.
Before the stage from FIG. 1 to the stage of FIG. 4, the operating member 63 and the nozzle head 4 have not yet been lowered.
In the state of FIG. 4, the lower end of the fitting peripheral wall 40b abuts on the top wall 6 of the nozzle head 4, and when the top surface T is further pushed down from this state, the piston head 30 and the nozzle are as shown in FIG. The head 4 descends together with the operating member 63 not shown in the figure, whereby bubbles are discharged from the tip of the nozzle 12 through the internal passage P.
When the push is released, as shown in FIG. 6, the elastic restoration of the coil spring of the operating member 63 causes the operating member 63, the nozzle head 4, and the piston head 30 to rise together. As a result, the discharge of bubbles from the nozzle is stopped, the liquid in the container body 100 is sucked into the liquid cylinder 66b, and the outside air is introduced into the air cylinder 66a.
Next, due to the elastic restoration of the elastic plate portion 46, the piston head 30 rises with respect to the nozzle head 4 as shown in FIGS. 6 to 7. As a result, the piston 38 rises in the cylinder cylinder portion 16, so that bubbles are sucked back from the nozzle 12 side.
Therefore, dripping from the tip of the nozzle 12 is prevented.
Further, since the communication flow path is formed by the communication hole 14 and the cylinder cylinder portion 16, there is almost no place where the drawn foam is liquefied and stays like the elastic dome of the conventional technique. The quality does not deteriorate.
In particular, as shown in the illustrated example, in the configuration in which the cylinder cylinder portion 16 is arranged directly above the vertical passage portion P1, even if bubbles may be liquefied in the cylinder cylinder portion 16, the liquid may liquefy the vertical passage portion. Since it passes through and returns to the lower part of the foaming means F, it is unlikely that the liquid is mixed with the foam generated at the next ejection.

2 ... Head member 4 ... Nozzle head 6 ... Top wall 8 ... Mounting cylinder 9 ... Guide cylinder 9a ... Locking protrusion 10 ... Extension cylinder 11 ... Cover cylinder 12 ... Nozzle 12a ... Nozzle body 12b ... Bent cylinder 14 ... Communication hole 16 ... Cylinder cylinder part 16a ... First retaining convex part 30 ... Piston head 32 ... Base part 34 ... Bottom wall 36 ... Circular ridge part 38 ... Piston 38a ... Seal ridge 40 ... Double peripheral wall part 40a ... Standing Peripheral wall 40b ... Fitting peripheral wall 42 ... Locking rib 44 ... Reinforcing part 45 ... Die-cut hole 46 ... Elastic plate part 48 ... Hinge part 50 ... Pressing part 51 ... Pressing plate 52 ... Engagement ring
60 ... Discharger body 62 ... Mounting member 62a ... Mounting cylinder 62b ... Guide cylinder 63 ... Acting member 64 ... Stem 66 ... Pump cylinder 66a ... Air cylinder 66b ... Liquid cylinder 68 ... Mounting cylinder 70 ... Suction pipe 100 ... Container body B ... Elastic urging means d1 ... Insertion allowance d2 ... Descent allowance e1 ... Base end e2 ... Tip F ... Foaming means P ... Internal passage P1 ... Vertical passage part P2 ... Horizontal passage part T ... Top surface

Claims (5)

The head member (2) that projects the nozzle (12) outward to the side,
The head member (2) is provided with a discharger main body (60) configured to suck up the liquid in the container by moving up and down and mix it with air to pump the mixed fluid to the head member (2) side. death,
A foam ejector having a function of foaming the mixed fluid and ejecting it from the nozzle and sucking back the residue in the nozzle after the ejection.
The head member (2) is
A nozzle head (4) including the nozzle (12) and a built-in internal passage (P) from the ejector main body (60) to the tip of the nozzle (12).
It is formed by a piston head (30) attached to the top wall (6) of the nozzle head (4) so as to be able to move up and down.
The nozzle head (4) has a cylinder cylinder portion (16) communicating with the internal passage (P) erected from the top wall (6).
The piston head (30) is positioned above the internal flow path (P) from the back surface side of the piston head, and is fitted and vertically movable on the inner surface of the cylinder cylinder portion (16). A boss-shaped piston (38) is vertically installed and has a top surface (T) for pushing down.
An elastic urging means (B) for urging the piston head (30) upward is provided between the bottom wall (34) of the piston head (30) and the top wall (6) of the nozzle head (4). A foam ejector characterized by that. The internal passage (P) is composed of a vertical passage portion (P1) continuous with the discharger main body (60) and a horizontal passage portion (P2) extending from the vertical passage portion to the tip of the nozzle (12).
The lateral passage portion (P2) is formed along the back surface of the top wall (6) of the nozzle head (4), and the cylinder cylinder is formed through the communication hole (14) formed in the top wall (6). The foam ejector according to claim 1, wherein the foam discharger is continuous with the portion (16). The foam according to claim 1 or 2, wherein the guide cylinder portion (9) for guiding the ascending / descending of the piston head (30) stands up from the top wall (6) of the nozzle head (4). Discharger. The piston head (30) has a base portion (32) in which a fitting peripheral wall (40b) formed around the bottom wall (34) is fitted in the guide cylinder portion (9), and the base portion. The foam ejector according to claim 3, wherein the pressing portion (50) covering the upper surface of the (32) is connected via a hinge portion (48). The elastic urging means (B) was integrally projected from one of the bottom wall (34) of the piston head (30) and the top wall (6) of the nozzle head (4), and was pressed against the other. The foam ejector according to any one of claims 1 to 4, wherein the foam ejector is formed of an elastic plate portion (46).

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