JP2581644Y2 - Pump type foaming container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which a foaming liquid such as a shampoo, a hand soap and a shaving detergent and air are pumped into a mixing chamber by pushing down a nozzle body fixed to a piston body. The present invention relates to a pump-type foaming container that mixes and foams both in a room and then passes through a porous body such as a net to make uniform foam and discharges the same from a nozzle body.

[0002]

2. Description of the Related Art The present applicant has already proposed a pump-type foaming container as disclosed in International Publication No. WO92 / 08657.

In this publication, an air cylinder provided inside an opening of a container containing a liquid and a liquid cylinder extending below the bottom of the air cylinder are provided concentrically. A double cylinder, a liquid suction pipe extending from the bottom of the liquid cylinder to the bottom of the container, and an air piston and a liquid piston that move up and down in the air cylinder and the liquid cylinder, concentrically and integrally. A nozzle body having a bubble discharging hole provided at the upper end of the piston body, an air passage communicating the hole with the inside of the air cylinder, and a hole and the inside of the liquid cylinder. And a first passage provided in the middle of the liquid passage.
A check valve, a second check valve disposed in the liquid cylinder,
A sheet-like porous body disposed in a hole on the downstream side of the mixing chamber in which the air passage and the liquid passage communicate with each other; an urging spring for urging the piston body toward the top dead center with respect to the double cylinder; and a container. An air hole formed in an air cylinder to introduce air outside the container into the container to prevent the inside of the container from becoming a negative pressure due to the consumption of liquid inside, and attached to the air cylinder, An operating valve that normally closes the air hole, a lid that fixes the double cylinder to the container and guides the piston through the piston, further includes a sliding portion of the air piston and a liquid piston. A third difference is provided between the outer peripheral surface of the air piston and the lid to introduce air into the air chamber formed by the air cylinder and the air piston. A check valve is provided on the air piston, and the outer circumference of the air piston A male screw portion is formed near the nozzle body on the upper side, and a female screw portion is formed on the lid body so that the screwed state between the air piston and the lid can be maintained against the biasing spring. A pump-type froth container is disclosed.

In the embodiment of this publication, a ball valve in which a ball is constantly biased to a valve seat by a weak spring is used as a first check valve, and a double-cylinder flange portion is used as an operating valve. A thin tongue formed by extending an annular sealing body made of a soft resin and extending downward to maintain the sealing property between the openings of the container was used.

That is, in the pump type foaming container of the embodiment, the screwed state of the nozzle body and the lid is released, and the nozzle body and the piston body after discharging the foam are raised to the upper limit position. In order to prevent the foaming liquid in the liquid passage and the liquid cylinder from leaking easily from the tip of the nozzle body when the container is overturned, the liquid passage end upstream of the mixing chamber (the outlet of the liquid passage on the mixing chamber side). The ball of the ball valve provided in (1) is always kept in close contact with the valve seat by a weak spring to keep the liquid passage end closed, and the foaming liquid and air are pressurized and sent to the mixing chamber for foaming, and further through the porous body. The ball resists the elasticity of the weak spring due to the pressure of the foamable liquid that rises in the liquid passage from the liquid cylinder only when the piston body is lowered to discharge it from the tip of the nozzle body into a uniform bubble. Then lift So that the liquid can enter the mixing chamber, and the liquid in the container does not enter the air cylinder from the air hole provided in the air cylinder. The air hole is always kept closed with a thin tongue made of soft resin, and only when the inside of the container becomes negative pressure due to foam discharge, the thin tongue is displaced outward and the air hole is opened and the container is instantly opened. So that the negative pressure inside can be eliminated.

[0006]

[Problems to be solved by the invention] However, as a result of the subsequent research, it has been found that the pump-type foaming container having the above-described structure has the following disadvantages. That is, if the environmental temperature rises rapidly (for example, from 5 ° C. to 20 ° C.) in a state where the nozzle body is rising to the upper limit position, the air and liquid inside the container thermally expand and the volume increases. The pressure inside the container rises, and the liquid in the pressurized liquid passage pushes up the ball of the ball valve against the weak spring to open the tip of the liquid passage. It rises and is discharged from the tip of the nozzle body (drips), but mostly flows backward through the air passage, flows down into the air chamber, and accumulates here. The same occurs when the container is dropped from a high place (the liquid in the liquid passage strongly presses the ball due to the impact at the time of falling and separates it from the valve seat).

When the amount of liquid stored in the air chamber increases, the stored liquid is sent from the air chamber to the mixing chamber instead of air during subsequent use. In some cases, bubbles (water-like bubbles or heavy bubbles) having a high liquid ratio are discharged, or the liquid is discharged as a liquid without forming bubbles.

[0008] These phenomena can be improved by increasing the spring constant of the spring pressing the ball against the valve seat. However, when this is done, a strong pressure is required for the liquid in the liquid passage to push up the ball and enter the mixing chamber. As a result, the force required to press the nozzle body to push down the piston body becomes too large, making it difficult to use.

Further, since the actuating valve comprising a thin tongue portion made of a soft resin is small and easily deformed, it is difficult for an automatic assembling apparatus to accurately position and mount the air valve at a proper position for closing the air hole. Therefore, there is a disadvantage that the efficiency is not improved and the assembly cost is increased.

On the other hand, Japanese Unexamined Utility Model Publication No. 63-9254, which discloses a pump-type liquid ejection container, which is not a foaming container, discloses a liquid cylinder even when the container is overturned with the nozzle body at the upper limit position. There is disclosed a device provided with a valve mechanism such that the liquid inside the nozzle body is not discharged from the tip of the nozzle body.

In other words, this pump type liquid ejection container has a tubular piston attached to the lower end of a stem inserted vertically and movably in a cylinder with a suction valve attached to the container mouth, The upper part of the stem has an operating member with a discharge valve fitted with a press-down head with a nozzle, raises the inner cylinder from the bottom inside the cylinder, and forcibly slides a rod-shaped member that reaches above the stem on the inner surface of the inner cylinder. The large outer diameter portion attached to the upper end of the rod-shaped member is freely fitted into the stem above the engagement ridge provided on the upper portion of the stem so as to freely move up and down to engage with the large outer diameter portion. The discharge valve is formed by the outflow through hole provided in the side wall at a position corresponding to the inlet of the nozzle above the ridge, and the outflow through hole is closed when the stem is raised (including when the stem is at the upper limit position). When the stem is lowered (including when it is at the lower A configuration in which the lower end of the rod-shaped member is fitted into the inner cylinder base and the lower part of the cylinder is closed when the cylinder and the lid suspended from the press-down head are screwed together. It has become.

Further, it can be seen from the drawings of this publication that the air hole provided in the cylinder is substantially closed by the cylindrical piston when the stem is at the upper limit position.

However, the valve mechanism used in this liquid ejection container cannot be diverted to the foaming container as it is. Because, to generate a homogeneous foam,
The foaming container requires not only the liquid cylinder but also a larger air cylinder, a means for introducing air into the air cylinder and the container, and an air passage. The structure becomes complicated such that it is necessary to provide a mixing chamber in which both passages join on the downstream side and arrange a sheet-like porous body on the downstream side, and it is possible to easily extend the rod-shaped member to the inlet of the nozzle. This is because it becomes difficult or disadvantages occur with the diversion.

For example, since the porous body is disposed on the upstream side (downward) of the stem corresponding to the inlet of the nozzle so as to cross the passage, the rod-shaped member can be extended to a position where the inlet of the nozzle can be closed. In addition, if the idea of the above publication is introduced and the air hole of the air cylinder at the time when the stem is at the upper limit position is changed to a type in which the air hole is closed by the air piston, when the stem is at the lower limit position, (Because the container is filled with an effervescent liquid and shipped until the start of use), the air holes are in an open state. If the foaming liquid in the container has been wavy enough to reach the air holes due to vibration or vibration for a long time, the liquid will enter the air cylinder from the air holes. And gradually fix air The air accumulates on the upper side of the air chamber, and eventually enters the air chamber from the check valve part provided in the air piston to introduce air into the air chamber, or accumulates on the check valve and due to its viscosity In order to not only reduce the function of the valve, but also to foam and discharge the liquid, the liquid that has accumulated on the upper surface side of the air piston when the screw is unscrewed from the nozzle and the air that rises rapidly This causes a problem that the water is leaked out of the container from a gap between the lid and the air piston by being pushed up by the air piston.

An object of the present invention is to provide a pump-type foaming container which solves the above-mentioned problems.

[0016]

According to the present invention, in order to achieve the above object, the piston is forcibly moved up and down by a predetermined amount in the liquid passage formed inside the piston along with the up and down movement of the piston. In addition to the provision of the rod-shaped valve body, the liquid chamber has an upper cylindrical portion that can be tightly fitted in the liquid passage, and a cylindrical member that engages with the rod-shaped valve body on the inner surface side and limits the amount of vertical movement of the rod-shaped valve body. When the piston body is raised to the upper limit position by providing a stop body, the outlet of the liquid passage on the mixing chamber side is closed at the upper part of the rod-shaped valve body, and the upward movement of the rod-shaped valve body is prevented by the cylindrical locking body. ,on the other hand,
When the nozzle body is engaged with the lid body and the piston body is lowered to the lower limit position, the upper cylindrical portion of the cylindrical locking body is tightly fitted into the liquid passage and the rod-shaped valve body is tightly closed in the upper cylindrical portion. The liquid passage is closed by being inserted, and furthermore, while the piston body is descending, the closing of the liquid passage and the outlet of the liquid passage on the mixing chamber side by the rod-shaped valve body is released. Is provided with an annular sliding seal portion that slides up and down in the air cylinder at a lower portion with a size and shape capable of closing the air hole of the air cylinder, and air is provided at an upper portion at a predetermined distance from the sliding seal portion. An annular seal portion having a size and a shape capable of closing the air hole provided in the cylinder for air is provided. Close the hole and the piston body When descending to the limit position, the air hole of the air cylinder is closed by the annular seal at the top of the air piston, and the piston body is at least at a certain range between the upper limit position and the lower limit position. At one time, the air cylinder above the air hole is provided with air passage forming means for forming a gap through which air can pass between the annular seal portion above the air piston.

When the piston body is raised to the upper limit position, the rod-shaped valve body may close not only the outlet of the liquid passage on the mixing chamber side but also the outlet of the air passage on the mixing chamber side.

[0018]

According to the present invention, when the piston body is at the upper limit position after the consumer starts using the liquid, the mixing chamber of the liquid passage provided in the liquid piston which is always biased upward. Since the side outlet is closed by a rod-shaped valve body whose upward movement is prevented by a cylindrical locking body, even if there is a sudden rise in the environmental temperature, the container may be dropped or overturned. Also, the closing of the liquid passage outlet is not released, and therefore, the foamable liquid in the liquid passage is not discharged from the nozzle body through the mixing chamber, and does not flow backward from the mixing chamber through the air passage to the air chamber.

Further, in the present invention, when the piston body is at the upper limit position, the air hole of the air cylinder is closed by the sliding seal at the lower part of the air piston, so that the container can be turned over or dropped. The foaming liquid does not enter the air cylinder from the air hole.

Further, according to the present invention, between the time when the container is filled with the effervescent liquid and shipped, and the time when the consumer starts using the liquid,
When the nozzle body is engaged with the lid and the piston body is at the lower limit position, the air hole provided in the air cylinder is closed by the annular seal at the top of the air piston,
Even if the container is placed on its side for a long time during transportation, etc., or if the foaming liquid vibrates up and down greatly due to vibration, the liquid does not enter the air cylinder from the air holes.
In addition, since the upper cylindrical part of the cylindrical locking body is tightly fitted between the inner surface of the liquid piston and the outer surface of the rod-shaped valve body, and the liquid passage is tightly closed, foaming to the outside of the container via the liquid passage is possible. No liquid leaks.

Further, in the present invention, the annular seal portion and the sliding seal portion of the air piston are spaced apart from each other by a distance corresponding to a distance for vertically moving the air piston corresponding to the upper limit position and the lower limit position of the piston body. Since the air passage forming means is provided in the air cylinder above the air hole, the open state of the air hole is maintained while the piston body is pushed down from the upper limit position and while the piston body returns to the upper limit position. An air passage is formed between the air bubble and the upper portion of the air cylinder, and the negative pressure accompanying the reduction of the foaming liquid in the container is eliminated by the air suction from the air hole.

Furthermore, in the present invention, since the annular seal portion on the upper portion of the air piston and the sliding seal portion on the lower portion are provided at predetermined intervals and are both annular in advance, the cylinder for the air is required when assembling the pump type foaming container. There is no need to align with the air holes.

When the piston body is raised to the upper limit position, the outlet of the mixing chamber side of the air passage as well as the liquid passage is closed by a rod-shaped valve body. Even if the bubbles remaining in the bubble passage return to the liquid with the passage of time, it is preferable because the liquid does not flow backward through the air passage and flow down into the air chamber.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to the drawings. 1 to 3 are longitudinal sectional views of a first embodiment of the present invention. FIG. 1 shows a state in which a piston body is at an upper limit position before pressing a nozzle body, and FIG. 3 shows a state in which the piston body is at the lower limit position by engaging the nozzle body and the lid body with each other. FIG. 5 is an enlarged view of a main part of FIG.

In FIG. 1, reference numeral 1 denotes a container made of a synthetic resin, which contains a foaming liquid A (W indicates a liquid level). A male screw portion is provided at the outer peripheral edge of the opening of the container 1, and the female screw of the large lid body 15 in which most of the top wall is cut off except for the outer peripheral portion. By screwing the parts together, the airtightness of the container 1 is maintained, while a foaming pump described later is fixed to the container 1 in a completed state.

Next, in the figure, reference numeral 3 denotes a double cylinder of a foaming pump integrally formed of synthetic resin. As shown in the figure, a large-diameter air cylinder 3c and a small-diameter liquid cylinder are provided concentrically. 3d, and has an annular projection at the upper opening edge, and is fitted into the annular groove of the small lid body 14.
And a flange portion 3 which is a portion fixed to the container 1
and b are each formed in an annular shape.

The small lid 14, which constitutes the lid 16 together with the large lid 15, has a cylindrical wall with the center of the top wall part cut off and the periphery of the cut part extending downward. The cylindrical wall has an upper large-diameter portion and a lower small-diameter portion, and the large-diameter portion is formed with a female screw portion 14a that engages with a nozzle body 17 to be described later. . A cylindrical outer wall engaging portion 14c and an inner wall engaging portion 14b are respectively suspended from the outer peripheral edge of the top wall portion of the small lid body 14 and the inner surface of the top wall portion slightly inside thereof, so that a double cylinder fits. An annular groove into which the joint ring 3a fits is formed. An annular recess for accommodating the annular projection of the fitting ring 3a is formed on the inner surface side of the outer wall locking portion 14c.

In the drawing, P is a piston body which is composed of a synthetic resin air piston 10 and a synthetic resin liquid piston 12 provided concentrically. 12 for each air cylinder 3
When press-fitting into the cylinder c and the liquid cylinder 3d, a spring is interposed between at least one of the cylinders and the piston so that the piston body P is always urged upward. In this embodiment, the coil spring 6 is connected to the liquid cylinder 3.
d and the piston 12 for liquid.

The double cylinder 3 will be described in more detail. The air cylinder 3c has a cylindrical guide tube portion 3c _{1 having} an inner diameter smaller than the fitting ring portion 3a, and a cylindrical slider having an even smaller inner diameter and connected to the guide tube portion 3c ₁ by a taper portion. a cylindrical portion consisting acting cylinder portion 3c ₂ Prefecture, extends from the lower end of the sliding cylinder portion 3c ₂ diametrically inwardly, comprising a bottom portion 3e of the central portion is inverted upward. On the other hand, the liquid cylinder 3d is connected to the upper end of the inverted portion of the bottom portion 3e of the air cylinder, where the seal protrusion 3f described later is formed, and extends downward from the connected portion, It becomes a cylindrical cylinder part having the same inner diameter, and ends up with a lower hole part 3i having a smaller inner diameter below it.

[0030] upper part of the sliding cylinder portion 3c ₂ of the air cylinder, the air holes 3 for introducing air into the container 1
0G is drilled. A ball (valve element) and a ball valve seat are provided between the cylinder part of the liquid cylinder 3d and the lower hole part 3i, and the liquid cylinder 3d and the liquid piston 1
A first check valve 8 is provided which is opened when the liquid chamber formed by the first and second valves 2 and 3 has a negative pressure. An annular pedestal portion 3K is provided. Further, a liquid suction pipe 4 reaching the bottom of the container 1 is press-fitted into the lower hole 3i.

The piston body P corresponding to the piston of the bubble pump is slid vertically in the air cylinder 3c and the liquid cylinder 3d of the double cylinder. First, the air piston 10 includes an air chamber portion 10i of the hat-shaped body, extending from the lower end of the air chamber portion 10i downward and outward, vertically sliding inner surface of the cylinder portion 3c ₂ of the air cylinder in a sealed state sliding seal portion of the cross-section U-shaped (or C-shaped cross section) in the annular manner can be secured sufficiently airtight between the sliding cylinder portion 3c ₂ when slid 1
And 0j, a hollow rod portion 10a extending from the center portion of the air chamber portion 10i upward, usually guiding cylinder portion 3c ₁
In order to close the air hole 30G of the air cylinder when the piston body P is lowered to the lower limit position (see FIG. 3) while maintaining a state spaced from the inner surface of the air chamber 10i, An annular seal portion 10k extending in a U-shaped cross section is provided outwardly, and these are integrally formed of synthetic resin.

The sliding seal portion 10j and the annular seal portion 10k of the air piston need not necessarily have a U-shaped cross section, but have a size and a shape that can close the air hole 30G of the air cylinder. When the piston 10 is raised to the upper limit position shown in FIG.
Closes the air hole 30G, while the air piston 10 is lowered to the position shown in FIG.
0k is provided at predetermined intervals above and below so as to close the air hole 30G. As a result, when the air piston 10 is moving up or down between the upper limit position and the lower limit position, the air hole 3
0G is open and the guide cylinder 3c ₁ of the air cylinder
An air passage O formed by a gap between the outer peripheral surface of the air chamber 10i of the air piston and the annular seal portion 10k;
Since the inside and the outside of the container 1 communicate with each other through the gap between the cylindrical wall at the center of the small lid body 14 and the outer surface of the rod portion 10a of the air piston penetrating the cylindrical wall, The negative pressure in the container 1 due to the suction of the liquid in the container 1 by the liquid piston 3d is immediately released by sucking air from the air hole 30G.

The air chamber 10i of the air piston 10
The air cylinder 3c and the air piston 10
At the time of negative pressure in the air chamber formed by
Is provided), a second check valve 9 for introducing air into the air chamber is provided. In the present embodiment, the second
As shown in the figure, the check valve 9 has an opening, a valve seat inside the opening, a ball built in below the valve seat, and a plurality of projections for preventing the ball from falling off. This second check valve is
When the pressure in the air chamber increases, the opening is closed, and when the pressure in the air chamber becomes negative, the opening is opened. The air chamber 10i
When the nozzle body 17 is screwed with the small lid 14 as shown in the figure, the nozzle body 17 fits tightly with the seal projection 3f of the double cylinder, and the air chamber and the air described later A cylindrical seal portion 10h that blocks the passage is suspended.

The hollow rod portion 10a of the air piston
Is composed of a lower portion into which the liquid piston 12 is press-fitted and a portion serving as the mixing chamber 11 above the lower portion. The inner diameter of the lower portion is substantially equal to the outer diameter of the liquid piston 12, and the upper portion has the inner diameter. The diameter is reduced so as to be smaller than the outer diameter of the liquid piston 12. Vertical ribs 10d are radially provided in the mixing chamber 11, and an opening hole 10c is provided at an upper end thereof.

Since the liquid piston 12 is pressed into the rod portion 10a of the air piston, both pistons move up and down integrally. The liquid piston 12 has a substantially cylindrical shape as a whole, and a plurality of longitudinal grooves 12e extending to the upper end to form an air passage are provided on an upper outer surface side fitted into the rod portion 10a. I have. These flutes 12
e is provided on the upper end surface at the upper end, and is connected to a lateral groove extending in the axial direction of the liquid piston 12. When the width of the vertical groove portion 12e is wide, it may be sufficient to provide only one. Needless to say, the vertical groove portion and the horizontal groove portion may be provided on the inner surface side of the rod portion 10a.

A mortar-shaped (or funnel-shaped) valve seat 12b whose inner diameter increases as it goes upward is provided on the inner surface of the upper end of the liquid piston 12. On the other hand, at the lower end, And a sliding seal portion 12d which moves up and down in a liquid-tight manner in the liquid cylinder 3d.
The receiving part 12 on the upper end side of the coil spring 6 is located inside d.
c is formed in an annular shape, and the inner diameter of the upper portion of the hollow portion (liquid guide portion 12a), which is the intermediate portion, is made smaller than the inner diameter of the lower portion to form a small inner diameter portion 12g.

As shown in the drawing, a rod-shaped valve element 7 and a cylindrical locking element 5, both of which are made of synthetic resin, are mounted in the liquid guide portion 12a of the liquid piston. ,
A valve mechanism for opening and closing the liquid outlet 12h is provided. Among them, the rod-shaped valve element 7 has an upper part formed on the large-diameter rod part 7c and a lower part formed on the small-diameter rod part 7d, and an inverted frustoconical valve element part 7b formed on the upper end part of the large-diameter rod part 7c. The small-diameter rod portion 7d has a large-diameter portion 7a having a portion whose diameter is suddenly increased so as to form a step at the lower end thereof, and a tapered end portion. The outer diameter of the large-diameter rod portion 7c of the rod-shaped valve body is smaller than the inner diameter of the upper part of the liquid guide part 12a of the liquid piston, and the large-diameter rod part 7c is inserted into the upper part of the liquid guide part 12a. In this state, a liquid passage is formed. At least the maximum outer diameter of the valve body 7b at the upper end of the rod-shaped valve body is larger than the inner diameter of the upper part of the liquid guide part 12a of the liquid piston. Between the valve outlet 12h and the valve seat 12b.

On the other hand, the cylindrical locking body 5 has an outwardly annular receiving portion 5c at a lower end portion serving as a lower end side receiving portion of the coil spring 6, and a vertical opening serving as a liquid passage above the receiving portion 5c. A cylindrical portion provided with a plurality of grooves (or split grooves) 5d radially;
Further, the upper side is a complete (non-perforated) cylindrical portion and is engaged with the large-diameter portion 7a at the lower end portion of the rod-shaped valve body so that the rod-shaped valve body 7
An inward annular projection 5a for preventing the liquid piston 12 from rising is formed at the upper end when the nozzle body 17 and the small lid body 14 are engaged by screwing as shown in FIG. An upper cylindrical portion 5b is provided which closely fits between the inner surface of the upper portion and the large-diameter rod portion 7c of the rod-shaped valve body to close the liquid passage. In addition, the cylindrical locking body 5 is supported by the pedestal portion 3K below the liquid cylinder and stands upright in the liquid cylinder 12 (or in the liquid chamber).
The rising distance of the ball of the first check valve 8 is restricted by its lower end.

The upper end 10e of the rod portion 10a of the air piston is provided with an L-shaped through-hole, and the nozzle body 17 is provided with two nets 18 so as to cross the through-hole.
The nozzle body 17 and the air piston 10 are integrated by press-fitting into the press-fit hole 17f. Although not shown, an annular concave portion is provided in the press-fitting hole portion 17 of the nozzle body, and an annular convex portion is provided on the outer surface side of the upper end portion 10e of the rod portion 10a, and the convex portion is fitted and fixed in the concave portion. I can do it. Of course, the convex portion and the concave portion may be exchanged, or another engaging means may be employed. The nets 18 and 18 are made of synthetic resin yarns, and are welded to both ends of a cylindrical synthetic resin spacer and press-fitted into the nozzle body 17. still,
A male screw portion 17d for screwing with a female screw portion 14a formed on the cylindrical wall of the small lid 14 is formed on the outer periphery of the lower portion of the nozzle body 17.

Next, an example of a method of assembling the foaming pump will be described. First, an annular seal body 2 made of a soft synthetic resin
Through the liquid cylinder 3d and attached to the lower surface side of the flange portion 3b of the double cylinder. Next, the liquid cylinder 3
After inserting the ball of the first check valve 8 into d, the cylindrical stopper 5 is inserted, and the coil spring 6 is inserted from above.

On the other hand, after inserting the rod-shaped valve element 7 into the liquid piston 12 from the valve seat 12b at the upper end of the liquid piston 12 with the lower end side of the rod-shaped valve element 7 as the head, the second reverse The ball of the stop valve 9 is strongly pushed from the projection side for preventing falling off, and the liquid piston 3d is pushed strongly from the upper end side into the rod portion 10a of the air piston 10 mounted at a predetermined position. Since the inner diameter of the lower part of the rod portion 10a of the air piston is substantially equal to the outer diameter of the liquid piston, the pushing of the air piston 10 and the liquid piston 1
2 is fixed.

The air piston 10 and the liquid piston 1
The assembly of 2 and the rod-shaped valve element 7 is inserted into the double cylinder 3 in which the cylindrical locking element 5 and the like have already been inserted, with both central axes aligned. At this time, the large diameter portion 7 at the lower end of the rod-shaped valve body 7
a is pushed in a little strongly so that it can spread and pass through the inward annular projection 5a of the cylindrical locking member 5. Next, the large lid 15 is covered from the rod part 10a side of the air piston, and then the small lid 14 is covered, and the fitting ring 3a of the double cylinder is connected to the inner wall locking part 14b of the small lid and the outer wall. It is pressed into the annular groove between the locking portion 14c. At this time, the annular projection of the fitting ring 3a fits into the annular concave portion on the inner surface side of the outer wall locking portion 14c, so that the small lid 14 and the double cylinder 3 are firmly fixed.

Thereafter, the spacers having the nets 18, 18 attached to both ends are inserted into the through holes of the nozzle body 17 from the side having the male screw portion 17d, and then the press-fit holes, which are the through holes on the same side, are inserted. The upper end 10e of the rod portion of the air piston 10 is press-fitted into 17f. Then, the liquid suction pipe 4 is press-fitted into the lower hole 3i of the liquid piston. This completes the foaming pump.

Next, the nozzle body 17 is connected to the coil spring 6.
Press down against the elasticity of the
And the female screw portion 14a of the small lid 14 are screwed together. on the other hand,
After filling the container 1 with a predetermined amount of the foaming liquid, a foaming pump in which the nozzle body 17 and the small lid 14 are screwed is inserted into the container 1 and the large lid 15 is rotated. By screwing the male screw portion of the opening of the container 1 and the female screw portion of the large lid 15, the assembly of the pump-type foaming container is completed. This state is shown in FIG.

As is apparent from FIG. 3, when the pump-type foaming container is assembled, the annular seal portion 10k at the top of the air piston closes the air hole 30G of the air cylinder, The liquid passage is closed by fitting the upper cylindrical portion 5b of the cylindrical locking body between the small inner diameter portion 12g on the upper side of the liquid guide portion 12a and the large diameter rod portion 7c of the rod-shaped valve body, and further the air piston The cylindrical seal portion 10h engages with the inner surface of the seal protrusion 3f of the double cylinder to shut off the air chamber and the air passage. These closed and blocked states are maintained by screwing the male screw portion 17d of the nozzle body and the female screw portion 14a of the small lid body.

The state shown in FIG. 3 is maintained from the time when the assembly of the pump-type foaming container is completed to immediately before the consumer starts using the container. Even if the container is placed sideways, since the air hole 30G is closed, the foaming liquid A does not enter the air cylinder 3c, and the first position is obtained because the container is placed sideways. The non-return valve 8 is opened to allow the foaming liquid A to enter the liquid chamber, and furthermore, the foaming liquid A that has entered the liquid suction pipe 4 due to the rapid rise in the internal pressure of the container due to the rapid rise in temperature is reduced by the first check valve. Even if the ball of No. 8 is pushed up and enters the liquid chamber, since the liquid passage is closed, the foamable liquid A leaks out of the container 1 via the mixing chamber 11 on the outlet side of the liquid passage. It does not flow back into the air chamber. Note that the engagement between the cylindrical seal portion 10h of the air piston and the seal projection 3f of the double cylinder is performed only when the closing of the air hole by the annular seal portion of the air piston is incomplete. This helps prevent leakage to the nozzle body 17 and maintains the state shown in FIG. 3 when an external force is applied to the nozzle body 17 or when the container receives a strong impact.

When using this pump-type foaming container, first, the screwing of the nozzle body 17 and the small lid body 14 is released. Then, due to the elasticity of the coil spring 6, the piston body P, the nozzle body 17 and the rod-shaped valve body 7 move up to the positions shown in FIG. This position is such that the cylindrical locking member 5 whose lower end receiving portion 5C is pressed against the base portion 3K of the liquid piston by the coil spring 6 engages the large-diameter portion 7a of the rod-shaped valve body by its inwardly extending annular projection 5a. To stop the rod-shaped valve element 7 from further rising, and the rod-shaped valve element 7 contacts the valve seat 12b of the liquid piston by its valve element portion 7b, so that the liquid piston 1
2 is a position for preventing further upward movement of the piston body 2, and is an upper limit position of the piston body P.

As the air piston 10 and the liquid piston 12 rise, the air chamber and the liquid chamber are each in a negative pressure state, so that the second check valve 9 and the first check valve 8 are opened, respectively. The air in the upper space 100 on the upper surface side of the air piston 10 is sucked into the air chamber, and the foamable liquid A
Is sucked into the liquid chamber.

Further, since the foaming liquid is also supplied into the liquid suction pipe 4 in accordance with this, the volume of the head space portion of the container 1 increases by that much and the head space portion becomes negative pressure. 3 to the state shown in FIG.
There is open, and since the air passage O is formed between the outer peripheral surface and the guiding cylinder portion 3c ₁ the inner surface of the air cylinder of the air piston annular seal portion 10k and the air chamber portion 10i, air The air above the cylinder 3c is immediately sucked into the container 1 from the air hole 30G to eliminate the negative pressure.
At this time, air outside the container is sucked into the upper portion of the double cylinder 3 through a gap between the outer surface of the rod portion 10a of the air piston and the cylindrical wall at the center of the small lid.

Next, the nozzle body 17 is connected to the coil spring 6.
When pressed down by hand against the elasticity of the piston, the air piston 10 whose upper part is pressed into the through hole of the nozzle body 17, and the liquid piston whose upper part is pressed into the upper part of the air piston 10. 12 also falls at the same time. At this time, the rod-shaped valve element 7 is connected to the mixing chamber 1 above the rod portion 10a of the air piston.
1 does not descend until it collides with the lower end of the vertical rib 10d, and is pushed down by the vertical rib 10d to descend.
Therefore, in FIG. 1, the valve element portion 7b of the rod-shaped valve element is in close contact with the mortar-shaped valve seat 12b to close the liquid outlet 12h, but when the air piston 10 and the liquid piston 12 start to descend, the valve element The portion 7b is separated from the valve seat 12b, and the mixing chamber 11 of the liquid passage is formed.
The liquid outlet 12h, which is the outlet on the side, is open.

When the air piston 10 and the liquid piston 12 are pushed down, the second check valve 9 and the first check valve 8 are closed, so that the air chamber and the liquid chamber are compressed, respectively, and the air chamber is compressed. The air and the foamable liquid in the liquid chamber are pressurized, and the air passes through an air passage formed between the inner surface of the rod portion 10a of the air cylinder and the vertical groove portion 12e and the horizontal groove portion of the upper outer surface of the liquid piston. On the other hand, the liquid passes through a liquid passage formed between the liquid guide portion 12a of the liquid piston and the locking tubular body 5 and the rod-shaped valve body 7 and passes through the mixing chamber 11 of each passage.
It enters into the mixing chamber 11 from the side outlet and mixes and foams here. Thereafter, the foam is supplied from the opening hole 10c to the mixing chamber 1.
After exiting from No. 1 and passing through the nets 18 and 18 arranged in the foam passage formed by the through hole of the nozzle body 17, the foam is re-formed into a fine and uniform foam, and then from the opening at the tip of the nozzle body 17 Discharged.

The lowest position of the piston body P after the start of use is the position shown in FIG. In this state, the male screw portion 17d of the nozzle body 17 collides with the female screw portion 14a of the small lid member, so that further pressing down is not possible (however, if both the screw portions are screwed together, as shown in FIG. 3). To the position of.).

After this state, if the pressing force of the nozzle body 17 is released, the elasticity of the coil spring 6 causes the liquid piston 12 and the air piston and the nozzle body 17 integrated therewith to move. Immediately after that, the rod-shaped valve element 7 also starts to rise because the mortar-shaped valve seat 12b of the raised liquid piston comes into contact with the valve element portion 7b and applies an upward force.

At this time, as described above, the first check valve 8
And the second check valve 9 are opened, and the foamable liquid A in the liquid suction pipe 4 is sucked into the liquid chamber, and the air in the upper space 100 on the upper surface side of the air piston 10 is sucked into the air chamber, respectively. Further, the foamable liquid A in the container 1 flows into the liquid suction pipe 4, the air in the air cylinder 3C flows from the air hole 30G to the head space of the container 1, and the air outside the container 1 flows into the upper part of the double cylinder 3. Sucked into each other.

The piston body P, the nozzle body 17 and the rod-shaped valve body 7 stop rising at the upper limit position shown in FIG. By repeating the pressing operation of the nozzle body 17 and the release of the pressing, a desired amount of foam can be discharged.

In the state shown in FIG. 1, even if the container 1 is accidentally turned over or dropped, the liquid outlet 12 which is the outlet of the liquid passage on the side of the mixing chamber 11 is provided as long as the nozzle body 17 does not hit anything.
h is prevented from rising by the cylindrical locking member 5 at the valve seat 12b surrounding the liquid outlet 12 at the upper end of the liquid piston urged (pressed) by the coil spring 6 upward. Since the valve element portion 7b of the rod-shaped valve element is closed by strong contact, the liquid in the liquid passage does not leak out of the container 1 and also enters the air chamber via the mixing chamber 11. Absent. At this time, since the sliding seal portion 10j of the air piston closes the air hole 30G, the liquid in the container 1 penetrates not only into the air chamber but also into the air cylinder 10 from the air hole 30G. Nothing to do.

Further, the pump type foaming container in this state is
As described above, the liquid outlet 12h, which is the outlet of the liquid passage on the mixing chamber 11 side, is closed by the valve body portion 7b of the rod-shaped valve body, which is prevented from rising upward. A container placed in a place where the temperature easily rises increases the pressure in the container 1 with a sudden rise in the room temperature,
As a result, the pressurized liquid pushes up the ball valve of the first check valve 8 to enter the liquid chamber, and the rod-shaped valve element 7 moves even if an upward pressing force is applied to the rod-shaped valve element 7. Outlet 1
The opening 2h is not opened, and therefore, even under such conditions, the liquid does not leak out of the container 1 or enter the air chamber.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the second embodiment and the first embodiment is that not only the outlet of the liquid passage on the mixing chamber 11 side but also the air passage formed in the air piston 10 is formed by the valve body 7b of the rod-shaped valve body. That is, the outlet on the side of the chamber 11 is also opened and closed. Since all other aspects are the same as those of the first embodiment, only the portions different from the first embodiment will be described, and the description of the other portions will be omitted.

FIG. 4 is a longitudinal sectional view showing the state of the portion near the mixing chamber 11 when the piston body P has been raised to the raised position, and the other parts are in the state shown in FIG. I have. In this example, the vertical groove 12e formed on the upper outer surface side of the liquid piston 12 does not extend to the upper end of the liquid piston 12, and instead, the mortar-shaped valve seat 12b of the liquid piston extends from the upper end of the vertical groove 12e. Is provided. The vertical groove 12e and the through hole 12f form an air passage connecting the air chamber and the mixing chamber 11 with the inner surface of the rod 10a. As is clear from FIG. 4, the inverted frustoconical valve element portion 7b of the rod-shaped valve element 7 is in contact with the valve seat 12b on the upper side and the lower side of the through hole 12f (not shown, but the The valve body 7b is in contact with both the left and right sides.) Not only the outlet of the liquid passage on the mixing chamber 11 side, but also the outlet of the air passage on the mixing chamber 11 side is closed.

In this state, when the piston body P is pushed down by applying a pressing force to the nozzle body 17 by hand, the air piston 10 (rod portion 10a) and the liquid piston 12 immediately start to descend. The seat 12b is separated from the valve body 7b of the rod-shaped valve body and is a mixing chamber 1 for the liquid passage and the air passage.
The 1-side outlet is in an open state, and thereafter, the lower end of the vertical rib 10d provided in the mixing chamber of the rod portion 10a collides with the upper end of the valve body portion 7b of the rod-shaped valve body as it descends, and applies a pressing force to this. The rod-shaped valve element 7 starts to descend together with the liquid piston 12 in a state where the valve element part 7b and the vertical rib 10d are in contact with each other, that is, in a state where the outlet of the liquid passage and the air passage on the mixing chamber 11 side is opened. During this descent, the air in the air chamber and the liquid in the liquid chamber are separated by the air piston 10 and the liquid piston 1 respectively.
2, the pressurized air is jetted into the mixing chamber 11 through the gap between the inner surface of the rod portion 10a and the vertical groove portion 12e of the liquid piston 12 and the through hole 12f, and is also pressurized. The liquid is ejected into the mixing chamber 11 through a space between the inner surface of the liquid piston 12 and the outer surface of the rod-shaped valve element 7. As a result, the air and the liquid mix well and foam.

When the pressing force is released after the piston body P is pushed down to the state shown in FIG. 2, the piston body P immediately starts to rise due to the elasticity of the coil spring 6, so that the valve seat 12b of the liquid piston is a rod-shaped valve body. And rises together with the outlet of the liquid passage and the air passage on the mixing chamber 11 side closed.

At this time, the liquid chamber and the air chamber are in a negative pressure state, while the first check valve 8 and the second check valve 9 are open respectively. The foaming liquid and air are sucked into the liquid chamber and the air chamber, respectively. At this time, the annular seal portion 1 of the air piston is used.
0k and the guide cylinder 3c ₁ , there is a gap, and the air hole 30G is also in an open state, so that the air above the air cylinder passes through these gaps and the air hole 30G and the head space of the container 1 Sucked into the department.

The state when the piston body P has risen to the upper limit position is almost the same as that in FIG. 1, and as shown in FIG. 4, the outlet of the air passage on the side of the mixing chamber 11 is also closed by the valve body 7b. The only difference is as described above.

Further, in this state, the air hole 30G is closed by the annular seal portion 10k, so that the internal pressure of the container increases due to a sudden rise in the environmental temperature, the container 1 falls down, or the container 1 Also, as long as the nozzle body 17 does not receive the pressing force, the valve body 7b of the rod-shaped valve body does not separate from the valve seat 12b and the air hole 30G of the ring seal 10k of the air piston is not released. The liquid in the liquid passage does not leak out of the container through the mixing chamber 11 and does not flow back into the air chamber, and the liquid in the container does not enter the air cylinder 3c from the air hole 30G.

In this state, unlike the first embodiment, the outlet of the air passage on the side of the mixing chamber 11 is also closed by the valve body 7b. Even if the foam returns to the liquid after a long time and accumulates in the mixing chamber 11, the liquid does not flow backward through the air passage and enter the air chamber, and is ejected into the mixing chamber 11 at the next pump operation. It foams with the incoming liquid and is ejected.

When the nozzle body 17 and the small lid body 14 are at the lower limit position of the piston body P screwed, the outlet of the liquid passage and the air passage on the mixing chamber 11 side is opened as shown in FIG. And there is no difference from the first embodiment.

In the above-described embodiment, the valve body 7b of the rod-shaped valve body has an inverted truncated cone shape, and the valve seat 12b of the liquid piston has a mortar shape. However, the present invention is not limited to these shapes. The valve seat may have a circular cutout with a larger diameter inside the upper end of the liquid piston than the lower part, and the lower end of the large circular cutout may suddenly become a small circular cutout with a stepped portion. And the step may be used as a valve seat.

In the above embodiment, when the piston body is located between the upper limit position and the lower limit position, the gap through which air can pass between the annular seal portion of the air piston and the inner surface of the air cylinder. As an air passage forming means for forming
A larger diameter than the sliding cylinder portion 3c _2, the air hole 30G
Of it upward from using a guide tube portion 3C ₁ which extends to the upper end of the air cylinder, not limited to this, for example, constant cylindrical portion of the large diameter of the air holes 30G upper than the sliding cylinder portion 3C ₂ It may be provided in a range (which is sufficiently longer than the vertical length of the annular seal portion), a groove may be provided in the cylindrical portion above the air hole 30G, or a concave portion may be provided.

Further, in the above embodiment, as a means for engaging the nozzle body 17 with the small lid body 14, a male thread portion is formed on the nozzle body 17 and a female thread portion is formed on the small lid body 14, and both are screwed. For example, a cylindrical body having a female screw portion on the inner surface side is hung down from the nozzle body 17, while a cylindrical body having a male screw portion on the outer surface side is erected from the small lid body 14. An appropriate method may be adopted, such as a method of screwing both together, or a method of engaging a protrusion provided on the other side with a protrusion provided on the other side.

The vertical ribs 1 provided inside the mixing chamber 11
0d indicates that a plurality of projections are provided in the lower part of the mixing chamber 11 or that the opening hole 1
A small-diameter rod-like body or a cylindrical body having a notch, which is annularly arranged so that the upper end thereof abuts on the ceiling of the mixing chamber 11 without closing Oc, is replaced with one that stands upright from the upper end of the valve body 7b. be able to.

[0071]

As described above, the pump-type foaming container of the present invention has a structure in which when the piston body is raised to the upper limit position, the valve body of the rod-shaped valve body which is prevented from rising is moved upward. Since the mixing chamber side outlet of the liquid passage is firmly closed by contacting the valve seat of the liquid piston that is receiving the pressing force, even if the environmental temperature rises rapidly, or the container falls or falls,
As long as the nozzle body is not subjected to the downward force, the foaming liquid in the liquid passage, the liquid chamber and the container may leak out of the container from the nozzle body, or may flow back into the mixing chamber and accumulate in the air chamber. Absent.

In the pump type foaming container of the present invention, when the piston body is raised to the upper limit position, the air hole provided in the air cylinder is closed by the sliding seal of the air piston. Therefore, even if the container falls over and is left in that state for a long time, the foamable liquid in the container enters and accumulates in the air cylinder through the air hole, and the opening of the check valve provided in the air piston is opened. There is no such thing as entering the air chamber from the part.

Further, in the present invention, when the nozzle body and the lid are engaged and the piston body is at the lower limit position, the cylindrical locking body is tightly closed between the inner surface of the liquid piston and the outer surface of the rod-shaped valve body. Since the liquid passage is closed by being fitted into the container, the liquid in the liquid passage does not leak out of the container even if the container is vibrated during transportation of the container or the container is placed sideways.

In the present invention, when the nozzle body and the lid are engaged and the piston body is at the lower limit position, the air hole of the air cylinder is closed by an annular seal provided on the air piston. Because the container may be vibrated during transportation, etc.
Even if it is placed sideways, the foamable liquid in the container enters the air cylinder through the air hole and accumulates on the upper side of the air piston, and the opening of the check valve provided on the air piston There is no intrusion into the air chamber from the part and no leakage from the container through the gap between the piston body and the lid when the consumer releases the engagement between the nozzle body and the lid.

Further, according to the present invention, instead of closing the air hole of the air cylinder with a thin small tongue as in the conventional pump-type foaming container, an annular slide formed in advance on the air piston is used. Closed by dynamic seal and annular seal,
When assembling the foaming pump, there is no need to align the air hole with the sliding seal portion and the annular seal portion, and the assembling work is easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a piston body according to a first embodiment of the present invention is raised to an upper limit position.

FIG. 2 is a longitudinal sectional view showing a state where the piston body of the first embodiment of the present invention is lowered.

FIG. 3 is a longitudinal sectional view showing a state in which the nozzle body and the lid of the first embodiment of the present invention are engaged with each other and the piston body is lowered to the lower limit position.

FIG. 4 is a longitudinal sectional view of a main part of a second embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

Reference Signs List A foaming liquid O air passage P piston body 1 container 3 double cylinder 3c air cylinder 3c ₂ sliding cylinder section 3d liquid cylinder 4 suction tube 5 cylindrical locking body 5a inwardly-facing annular projection 5b upper cylindrical section 6 coil Spring 7 Rod-shaped valve element 7a Large diameter part 7b Valve element part 7c Large diameter rod part 7d Small diameter rod part 8 First check valve 9 Second check valve 10 Piston for air 10a Rod part 10j Sliding seal part 10k Annular seal part Reference Signs List 11 mixing chamber 12 liquid piston 14 small lid 14a female screw part 15 large lid 16 lid 17 nozzle body 17d male screw part 30G air hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A double cylinder comprising a concentric air cylinder and a liquid cylinder fixed to a lid attached to a container mouth portion, wherein the double cylinder is moved up and down in the axial direction, and a spring is A piston body including a large-diameter air piston and a small-diameter liquid piston urged upward by the elasticity of the piston is provided therein to form an air chamber and a liquid chamber, and the air chamber and the liquid chamber are formed. A mixing chamber is provided above the two chambers, and an air passage and a liquid passage for communicating the mixing chamber with the two chambers are provided in the air piston and the liquid piston, respectively, and a downstream side of the mixing chamber is provided. A sheet-like porous body is disposed across the bubble passage of the above, a liquid suction pipe extending to the bottom of the container is attached to the lower end of the liquid chamber, and a first check valve that opens the liquid chamber at a negative pressure is provided. The air chamber opens to the air piston at a negative pressure. A second check valve for sucking air outside the air chamber is provided, and an annular sliding seal portion that slides up and down on the inner surface of the air cylinder is provided below the outer peripheral surface, and the sliding seal portion slides. An air hole for introducing air into the head space portion of the container is provided above the sliding cylinder portion of the air cylinder, and the upper portion of the piston body extends upward through the lid and the piston A nozzle body having a bubble passage fixed to an upper end of the body, wherein the nozzle body is formed inside the piston body in a pump-type foaming container capable of engaging with a lid body against the elasticity of the spring. A rod-shaped valve body is forcibly moved up and down by a predetermined amount in accordance with the vertical movement of the piston body in the liquid passage, and the liquid chamber has an upper cylindrical portion which can be tightly fitted in the liquid passage and has an inner surface. Side engages with the rod-shaped valve By providing a cylindrical locking body for limiting the amount of vertical movement of the rod-shaped valve body, the dedicated valve body is configured such that when the piston body is raised to an upper limit position, the liquid passage is provided at an upper portion thereof. And closing the outlet of the mixing chamber at the lower portion and engaging the cylindrical locking body at the lower portion thereof to prevent upward movement, and the nozzle body engages with the lid body, and the piston body moves to the lower limit position. When descending, the liquid piston is tightly fitted into the upper cylindrical portion of the cylindrical locking body which is tightly fitted in the portion forming the liquid passage, thereby preventing downward movement and closing the liquid passage. Further, when the piston body is descending, the liquid passage and the outlet of the liquid passage on the side of the mixing chamber are closed, and the outer peripheral portion of the air piston is provided with the sliding member. At a predetermined interval above the seal, the sliding cylinder An annular seal portion having a size and a shape capable of closing the air hole is provided, and the sliding seal portion has a size and a shape capable of closing the air hole. When it is raised to the position, the sliding seal at the bottom of the air piston closes the air hole, while the nozzle body engages with the lid, and the piston body descends to the lower limit position. When the air cylinder is closed, the gap is such that the annular seal portion above the air piston closes the air hole, and the piston body is located at an upper limit position above the sliding cylinder portion of the air cylinder. An air passage forming portion that forms a gap through which air can pass between the air seal upper portion and the annular seal portion when the air piston is located at least in a certain range between the lower limit position and the lower end position. A pump type foaming container characterized by the above-mentioned. 2. The rod-shaped valve element has a structure in which, when the piston element is raised to the upper limit position, the upper part thereof closes the mixing chamber-side outlet of the liquid passage and the mixing chamber-side outlet of the air passage. 2. The pump-type foaming container according to 1.