WO2004016517A1

WO2004016517A1 - Pump unit and container

Info

Publication number: WO2004016517A1
Application number: PCT/JP2002/008318
Authority: WO
Inventors: Kiyoshi Chikashige; Akira Mizuochi
Original assignee: Advanex Inc.
Priority date: 2002-08-16
Filing date: 2002-08-16
Publication date: 2004-02-26
Also published as: AU2002328625A1

Abstract

A pump unit and a container in which outflow of liquid can be prevented surely at the time of turning over while enhancing the operability. When a piston head (20) is depressed and a subpiston (33) slides with respect to a piston shaft (28), an interconnecting hole (28b) is opened and when the piston head (20) is depressed furthermore, a bellows (22) is compressed to deliver a liquid from a container body (12)

Description

Description Pump unit and container Technical field

The present invention relates to a pump unit and a container used for a pump-type container such as a hair washing agent used at home, for example. Background art

2. Description of the Related Art Conventionally, pump-type containers have been used as containers for accommodating, for example, hair washes and detergents used at home. The pump-type container includes a container body and a pump unit removably inserted into the container body. Normally, when the piston part is pressed, the piston part returns and the liquid is sucked up from the container body, and then, when the biston part is pressed, the liquid is discharged from the discharge port of the piston part. .

As this type of pump unit, for example, as disclosed in Japanese Patent Application Laid-Open Nos. Hei 10-11011 and Hei 10-214947, a piston unit is pressed. The liquid is sucked into the bellows tube by using the return operation that expands again when the bellows tube is released, and the bellows part is further pressed to reduce the bellows tube and discharge the liquid in the bellows tube from the discharge port. There is. Then, the liquid is introduced into the bellows tube in response to the pressing operation and the return operation of the piston, or the suction valve and the discharge valve are provided on the upstream side and the downstream side of the bellows tube to discharge the liquid from the bellows tube. Are provided.

However, in the above-mentioned conventional pump unit, there is a problem that, when the suction valve or the discharge valve is opened when the container is overturned, the liquid flows out from the discharge port to the outside. Conventionally, in order to solve such a problem, at least one of the suction valve and the discharge valve is configured as a plate-shaped valve provided with a slit portion, and a liquid that is going to flow out when the container is overturned is formed in the slit portion. Although it is kept to a minimum, there is a problem that the flow resistance of the liquid in the slit part increases and the operation 'I' life deteriorates. Disclosure of the invention

Therefore, the present invention is to provide a pump unit and a container which can surely prevent the liquid from flowing out when falling down and can improve the operability.

In order to solve the above problems, a pump unit according to the present invention includes a pump unit (for example, a pump unit) that is inserted into a container body (for example, the container body 12 in the embodiment) and sucks a solution in the container body out of the container body. In the pump unit 10) in the configuration, a suction pipe inserted into the container body (for example, the suction pipe 21 in the embodiment) and a bellows connected to the upper part of the suction pipe and capable of returning in the extending direction are connected. A bellows (for example, bellows 22 in the embodiment) and a piston portion (for example, a bellows 22) that communicates with the upper part of the bellows to expand and contract the bellows and sucks the liquid in the container body out of the container body through the suction pipe. The shaft case 16 in the embodiment, the piston head 20, the piston shaft 28, and the sub piston 33) are provided. Provided upstream of the bellows is a suction valve (for example, suction valve 23 in the embodiment) that allows only the flow of liquid from inside the container body into the bellows. Piston head 20, biston shaft 28) Consists of a sub-viston mounted to be able to move a predetermined stroke in the bellows compression direction, and the sub-piston is the piston body prior to the bellows compression operation by the piston part. A communication hole (for example, a communication hole 28b in the embodiment) that opens a discharge flow path in the piston portion when the piston moves by a predetermined stroke (for example, a predetermined stroke H in the embodiment). A biasing member (for example, the biasing member according to the embodiment) for biasing the communication hole between the ton main body and the sub-piston in a direction of closing the communication hole. 3 4) is provided.

With this configuration, when the sub-viston is pressed in a state where there is no liquid in the bellows, the sub-biston slides against the body of the piston before the bellows is compressed, and the communication hole is opened. In this state, the bellows is further compressed by the piston portion which is pressed.When the bellows is compressed, the air in the bellows is compressed and the suction valve is closed, so that the air in the bellows is discharged through the communication hole. From the container body.

When the sub-biston is released, the sub-biston is attached to the biston body by the biasing member. On the other hand, the bellows return to close the communication hole and the compressed bellows returns to the extension direction, so that the inside of the bellows becomes negative pressure. Then, the suction valve is opened and the liquid is sucked from the container body into the bellows, filled therein and filled with the bellows.

Next, when the sub-viston is pressed again, the sub-viston slides into the body of the piston before the bellows is compressed, and the communication hole is opened. The liquid, whose backflow into the container body is thereby prevented, is discharged from the discharge channel to the outside of the container body through the open communication hole. As a result, the communication hole will not be opened unless the piston is pressed, so that the liquid inside will be drained even if the container itself is stepped on, as well as if the container falls down. There is an effect that there is no leakage.

In the above pump unit, the piston body is connected to an upper part of a bellows, and is connected to an upper part of the container body (for example, a mouth part 12a in the embodiment). A piston-shaped pipe-shaped shaft movably inserted with respect to the shaft case on the upper side of the shaft case, and a biston head communicating with an upper end of the sub-biston. A locking portion (for example, the screw portion 31 or 32 in the embodiment) for locking the biston shaft in a state pulled out from the shaft case is provided therebetween, and the screw head is engaged with the mouth of the container body. Then, an engaging portion (for example, female screw portion 20a in the embodiment) fixed here may be provided.

With this configuration, the piston shaft is inserted inside the shaft case of the piston body, and the engagement portion of the piston head is engaged with the mouth of the container body so that the piston shaft does not protrude. In use, the biston shaft can be pulled out from the shaft case and locked by the locking portion. In addition, when the piston shaft is inserted into the shaft case, the pushing operation of the piston shaft does not apply any force in the compression direction to the bellows. As a result, the communication hole is not opened unless the piston head is pressed, so that the liquid inside the container is drained even when the container itself is stepped on, as well as when the container falls down. This has the effect of not leaking out. Also, when the biston shaft is inserted into the shaft case in this way, The push-in operation does not apply any force in the compression direction to the bellows, so that the bellows does not set.

In the pump unit, the locking portion may be configured to be unlockable.

With this configuration, the locked state between the shaft case and the biston shaft by the locking portion is released, so that the biston shaft can be inserted into the shaft case.

With this, in addition to the above-mentioned effects, by releasing the locked state between the shaft case and the piston shaft by the locking portion, the biston shaft can be inserted into the shaft case. This has the effect of being compact and portable.

In the above pump unit, the biston body includes a pipe-shaped shaft case which is connected to an upper part of a bellows and is held at an opening of the container body, and a bush cap for holding the shaft case is provided at an opening of the container body. The bush cap is provided with an inclined surface at a lower end of an inner cylindrical portion disposed in the mouth of the container body, and the shaft case is separated from the inclined surface of the inner cylindrical portion. A seal projection that can abut as much as possible may be provided.

With this configuration, it is possible to block air leakage from between the inner peripheral surface of the bush cap and the outer peripheral surface of the shaft case by the seal projection of the shaft case abutting on the inclined surface. . Further, if the inclined surface of the bush cap and the seal projection of the shaft case are released when the shaft case is lowered, air from between the inner peripheral surface of the push cap and the outer peripheral surface of the shaft case is formed. Entry and exit are secured. Further, for example, when an external pressure is applied to the container body, the inner cylindrical portion is pressed against the seal projection, so that leakage is reliably prevented.

Thus, the seal projection of the shaft case abuts on the inclined surface, so that air leakage from between the inner peripheral surface of the push cap and the outer peripheral surface of the shaft case can be blocked. Also, when the shaft case is lowered, the contact between the inclined surface of the bush cap and the seal projection of the shaft case is released, so that air from between the inner peripheral surface of the bush cap and the outer peripheral surface of the shaft case is removed. In and out of To prevent “dents”. Further, for example, when an external pressure is applied to the container body, the inner cylindrical portion is pressed against the seal projection, so that leakage can be reliably prevented.

The container of the present invention is a container provided with any one of the pump units described above.

With this configuration, even if the container falls, the communication hole is not opened unless the sub piston and the piston main body slide, so that the internal liquid can be prevented from leaking to the outside.

This has the effect of making it easy to handle, as no liquid leakage occurs even when falling or stepping on. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall sectional view of a container equipped with the pump unit of the first embodiment. FIG. 2 is an enlarged cross section near the air hole of FIG.

FIG. 3 is an enlarged cross-sectional view showing a locked state between the biston shaft and the shaft case in FIG.

FIG. 4 is an enlarged view of part A of FIG.

FIG. 5 is a cross-sectional view showing a transport state of the container of FIG.

FIG. 6 is an operation explanatory view showing a state in which the biston head is pushed in.

FIG. 7 is an operation explanatory view showing a state in which the biston head is released.

FIG. 8 is an operation explanatory view showing a state in which the biston head is pushed in.

FIG. 9 is a partial sectional view of another embodiment of FIG.

FIG. 10 is a partial cross-sectional view showing another embodiment of FIG.

FIG. 11 is a partial sectional view showing still another embodiment of FIG.

FIG. 12 is a partially enlarged view of FIG.

FIG. 13 is a partial sectional view showing another embodiment near the air hole.

FIG. 14 is an enlarged view of part B of FIG.

FIG. 15 is a sectional view showing another embodiment of the biasing member.

FIG. 16 is a partial cross-sectional view showing another embodiment near the biston head. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the pump unit and the container according to the embodiment of the present invention will be described in detail.

FIG. 1 shows an embodiment of a container provided with a pump unit of the present invention. In FIG. 1, reference numeral 10 denotes a pump unit, and 11 denotes a container. The container 11 is configured by attaching a pump unit 10 to a container main body 12 in which a liquid hair washing agent and the like are stored.

The container body 12 is a bottomed cylindrical shape molded of a synthetic resin, and has a male screw portion 13 formed on the outer periphery of an upper mouth portion 12a. The mouth 12a is provided with a synthetic resin bushing 15 having a female thread 14 to be screwed into the male thread 13 and is attached to and detached from the mouth. By being worn, the pump unit 10 is attached to the container body 12. The bush cap 15 has an outer cylindrical portion 15 a having the female screw portion 14 formed therein, and an inner cylindrical portion 15 b which is inserted through the mouth portion 12 a of the container body 12 and is attached thereto. A hole (not shown) of the inner cylindrical portion 15b forms an opening of the container main body 12, and the shaft case 16 of the pump unit 10 is slidably passed through the opening.

A case 17 made of synthetic resin, which is installed toward the inside of the container body 12, is attached to the inside of the mouth portion 12 a of the container body 12, and the bush cap 15 is inserted through the case 17. It is attached to the mouth 1 2a. In particular, the inner cylindrical portion 15 b is fitted to the inner peripheral surface of the case 17 and fixed thereto. In addition, an air hole 18 is formed in the case 17, and the air hole 18 allows the inside of the container body 12 to pass through the gap between the inner cylindrical portion of the bush cap 15 and the shaft case 16 to the outside. To prevent so-called “dents” from occurring due to changes in the liquid volume in the container body 12. In addition, a male screw portion 15c that engages with a female screw portion 20a engraved on the inner peripheral surface of a biston head 20 described later is formed on the outer periphery of the upper portion of the push cap 15. Have been. The female screw portion 20a and the male screw portion 15c constitute an engaging portion.

The pump unit 10 is mounted on the case 17, a synthetic resin bellows cut 19 disposed in a state inserted through the case 17, and the bellows unit 19. It comprises a synthetic resin bistable head 20. Be The rose unit 19 is inserted into the container body 12 to suck the liquid in the container body 12 out of the container body 12. The bellows unit 19 is provided with a suction pipe 21 inserted into the container body 12. The suction pipe 21 is formed by cutting the suction end 21a at the lower end diagonally. The piston head is provided with a discharge port 20b.

A bellows-like bellows 22 that extends into the case 17 and that can return in the extending direction is connected to the upper end side of the suction pipe 21 in a state where the bellows 22 communicates. The bellows 22 easily compresses by pressing to reduce the internal volume, and when the pressing force is released, the bellows 22 easily returns to the original state, that is, the extending direction, and increases the internal volume. It is made of low-density polyethylene having such a structure and has a predetermined panel constant.

The shaft case 16 is fixed to the upper end side of the bellows 22 by press fitting. In addition, a suction valve 23 is provided upstream of the bellows 22, that is, between the suction pipe 21 and the bellows 22, which allows only the flow of the liquid from the container body 12 into the bellows 22. ing.

The suction valve 23 is formed with a valve chamber 24 integrally formed with the suction pipe 21.

In the valve chamber 24, a valve body 25 that can be inserted from the suction port 21a of the suction pipe 21 or the upper opening side of the press-fit portion 22b of the bellows 22 with the upper case 17 of the bellows 22 is provided. Has been inserted. The valve body 25 is made of a synthetic resin and is a bowl-shaped valve that opens toward the downstream side (the shaft case 16 side), and its outer peripheral surface is in close contact with the inner peripheral surface of the valve chamber 24. To prevent liquid backflow. The shape of the valve body 25 may be spherical or hemispherical, as long as it can close the valve chamber 24, and the shape is not particularly limited.

A mouth part 25a is formed on the upstream side of the valve body 25 of the suction valve 23, and the posture of the valve body 25 is stabilized by the mouth part 25a.

The valve body 25 of the suction valve 23 has a V-shaped notch 25b formed at the periphery thereof, and the notch 25b allows the liquid to quickly escape when the valve is opened. The shaft case 16 must be press-fit into the press-fit portion 2 2b at the upper end of the bellows 22 Accordingly, a bellows 22 is connected to the inside thereof in a pipe shape, and a piston shaft 28 is movably inserted at the upper end. The shaft case 16 has a large-diameter portion 29 that extends outward and is in sliding contact with the inner peripheral surface of the case 17 near the center of the outer peripheral surface thereof. As shown in FIG. 2, a stopper 30 is provided on the upper part of the large diameter portion 29 to prevent the bushing cap 15 from coming into contact with the lower end surface of the inner cylindrical portion 15b. Here, the large diameter portion 29 has upper and lower lip portions 29a and 29b for smooth sliding. When the large diameter portion 29 is not used between the lip portions 29a and 29b, the air hole 18 is closed and the liquid volume in the container body 12 does not change. Prevents the opening of 18 air holes.

As shown in FIG. 3, the piston shaft 28 has a screw portion 31 on the lower outer peripheral surface, and is configured to be detachably engaged with a screw portion 32 formed on the upper inner peripheral surface of the shaft case 16. The screw portions 31 and 32 constitute a locking portion. With the piston shafts 28 pulled out of the shaft case 16 by the screw portions 31 and 32, the two are used integrally.

The biston shaft 28 has a sub-piston 33 to which the biston head 20 is attached. As shown in FIG. 4, the sub-piston 33 moves by a predetermined stroke H with respect to the piston shaft 28 prior to the compression operation of the bellows 22 when pressing the piston head 20. The upper part of 28 opens a communication hole 28b formed in the cylindrical part 28a. When the communication hole 28b is opened, the discharge flow path (indicated by an arrow in FIG. 4) is opened.

Specifically, the lower cylindrical part 33a of the sub-viston 33 is fitted to the upper cylindrical part 28a of the biston shaft 28, and when the sub-viston 33 is lowered by a predetermined stroke H, the sub-biston 33 is lowered. 33 The lower cylindrical portion 33 of 3 33 The step portion 3 3b of 3a passes through the communication hole 28b, and the cylindrical portion 33c having a larger diameter faces the communication hole 28b with a distance. Therefore, the communication hole 28 b is opened. The shaft case 16, the piston head 20, and the biston shaft 28 constitute a piston body, and the piston body and the sub-biston 33 constitute a piston part.

Here, a biasing member 34 in the form of a force is provided on the biston shaft 28, and the biasing member 34 biases the biston head 20 upward. With this An urging force is applied to the piston shaft 28 and the sub piston 33 so that the communication hole 28 b is closed by the urging member 34. The biasing member 34 has a panel constant smaller than that of the bellows 22.

A large-diameter portion 28c is formed in the upper cylindrical portion 28a of the piston shaft 28 at a portion that supports the urging member 34, and the large-diameter portion 28c corresponds to the step portion 33b of the sub-biston 33. It functions as a retaining part and prevents the sub-biston 33 from coming off the biston shaft 28. It also has a function to prevent liquid leakage at the same time as retaining.

Next, the operation will be described.

During transportation, the screw portion 31 of the biston shaft 28 and the screw portion 32 of the shaft case 16 are not locked as shown in Fig. 3, so the screw shaft 28 as shown in Fig. 5 is not engaged. Into the inside of the shaft case 16 and screw the female thread 20 a of the biston head 20 into the male thread 15 c of the bush cap 15 to fix the biston head 20 to the bush cap 15. I do. As a result, the piston head 20 is not pressed, so that the internal liquid does not leak out from the discharge port 20b.

Also, at this time, the biston shaft 28 is separated from the shaft case 16, and the pushing operation of the biston shaft 28 does not apply any force in the compression direction to the bellows 22, so that the piston is compressed during long-time transportation. There is no problem that the bellows 22 causes sagging.

Furthermore, since the piston shaft 28 is not exposed to the outside, it can be protected from dirt. Further, even if pressure is applied to the piston shaft 28 when the container main body 12 is stepped on at this time, the lower cylindrical portion 33 a of the sub-biston 33 communicates as shown in FIG. Since the hole 28b is closed, the outflow of the liquid from the discharge port 20b can be reliably prevented.

Next, in order for the user to use the container 11 in the state shown in FIG. Pull it out from 6 and screw it in so that the screw 3 1 of the biston shaft 2 8 and the screw 3 2 of the shaft case 1 6 can be locked together to integrate them. As shown in 1, the container 11 is in use.

Then, when the piston head 20 is pressed against the biasing member 34, the sub-viston 33 shown in FIG. 4 is moved by a predetermined stroke H with respect to the piston shaft 28 before the bellows 22 is compressed. Slide to open communication hole 28b.

In this state, when the sub-viston 33, the biston shaft 28 and the shaft case 16 are further pressed, the bellows 22 is compressed, and the air in the bellows 22 is compressed, but the suction valve 23 is closed. The air in the bellows 22 is discharged from the discharge port 20b to the outside of the container body 12 through the communication hole 28b (see FIG. 6).

When the biston head 20 is released, the sub-biston 33 returns to the biston shaft 28 by the urging member 34 to close the communication hole 28 b and extend the bellows 22 which has been released in the extending direction. The inside of the bellows 22 becomes negative pressure to return to Then, the suction valve 23 is opened, and the liquid is sucked into the bellows 22 by the suction pipe 21 from the inside of the container body 12 and is filled in the bellows 22 (see FIG. 7). Next, in this state, when the biasing member 34f is piled and the biston head 20 is pressed again, the sub-viston 33 is pressed before the bellows 22 is compressed as described above. Slide through the predetermined stroke H with respect to the shaft 28 to open the communication hole 28b. When the sub-piston 33, the piston shaft 28 and the shaft case 16 are further pressed, the bellows 22 is compressed, so that the liquid that has been prevented from flowing back into the container body 12 by the suction valve 23 is opened. The fluid is smoothly discharged from the discharge port 20b to the outside of the container body 12 through the communication hole 28b (see FIG. 8). Therefore, handling is easier because the operating force is smaller than in the conventional case using slits. Therefore, the communication hole 28b is not opened unless the button 20 is pressed, so that, for example, when the container 11 falls down, the container body 12 is trampled. In such a case, the liquid inside does not leak out from the discharge port 20b.

Here, the present invention is not limited to the above-described embodiment, and the following various aspects can be adopted. In the following description, the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

Fig. 9 shows the piston shaft 28 replaced with the thread 31 of the piston shaft 28 shown in Fig. 3. On the side of the stone shaft 28, a flange portion 31a and a locking ridge 31b having an arc-shaped cross section are provided around the flange portion 31a, whereas the threaded portion 32 of the shaft case 16 is provided. Instead of this, a receiving portion 32 a corresponding to the locking ridge 31 b is provided on the shaft case 16 side. According to this embodiment, since the locking portions are arc-shaped, both can be smoothly locked.

Fig. 10 shows that instead of the screw portion 31 of the piston shaft 28 shown in Fig. 3, the riding surface 31c and the locking surface 31d are provided on the biston shaft 28 side. In place of the threaded portion 3 2 of the shaft case 16, a receiving slope 3 2 b corresponding to the riding surface 3 1 c is provided, and a locking surface 3 2 c is provided corresponding to the locking surface 3 1 d. It is a thing. According to this embodiment, the riding surface 31c and the receiving slope 32b can be locked with even smaller force.

Fig. 11 shows that instead of the threaded portion 31 of the biston shaft 28 shown in Fig. 3, an annular sharp groove 31e is provided on the biston shaft 28 side. In place of the screw portion 32 of FIG. 16, a protrusion 32 d corresponding to the groove 31 e and a screw portion 32 e thereunder are provided on the shaft case 16 side. The screw portion 32e corresponds to the screw portion 32f provided above and below the groove 31e. Here, as shown in FIG. 12, the ridge 3 2 d is formed higher than the threaded portion 32 e so that the ridge 32 d and the groove 31 e can be locked with a sense of moderation. .

According to this embodiment, when the piston shaft 28 and the shaft case 16 are fixed to each other, when the piston shaft 28 is pulled out, the ridges 3 2 d are locked in the grooves 31 e and both are locked. Can be stopped by one-touch operation. Also, after removing the ridges 3 2 d from the grooves 31 e, turn the biston shaft 28 to turn the biston shaft 28 with the screw part 32 f and the screw part 32 e. The locked state with the shaft case 16 can be easily released.

Next, FIGS. 13 and 14 show another embodiment for preventing the “dent”. In this embodiment, the air hole 18 is provided above the large diameter portion 29 of the case 17. In addition, the seal case 16 is provided on the shaft case 16 with a sealing projection 16a which is in contact with the inclined surface 15e of the thinned inner cylindrical portion 15d of the push cap 15 when the container 11 is not used. . ' According to this embodiment, when the container 11 is not used, the seal projection 16 a of the shaft case 16 is in contact with the inclined surface 15 e of the thinned inner cylindrical portion 15 d of the bush cap 15. As a result, air leakage between the inner peripheral surface of the bush cap 15 and the outer peripheral surface of the shaft case 16 can be blocked, and a piston head 20 not shown when using the container 11 is used. When the shaft case 16 is lowered, the contact between the inclined surface 15 e of the bush cap 15 and the seal projection 16 a of the shaft case 16 is released, and the inner periphery of the bush cap 15 is released. Air can flow in and out between the surface and the outer peripheral surface of the shaft case 16, and “dents” can be prevented. In particular, in this embodiment, for example, when an external pressure is applied to the container body 12, the inner cylindrical portion 15d is pressed against the seal protrusion 16a, which is advantageous in that leakage can be reliably prevented.

Furthermore, by thinning the inner cylindrical portion 15d, this portion can also be provided with paneling properties. For this reason, the balance between the bellows 22 and the inner cylinder part 15d is balanced, and the inclined surface 15e of the inner cylinder part 15d is brought into contact with the bellows 16a in a state in which the inclined surface 15e is in close contact with the projection 16a. With such a configuration, the reliability of the sealing property between the inner cylindrical portion 15d and the sealing protrusion 16a can be improved.

Further, various urging members can be used in place of the urging member 34 in the above embodiment. For example, as shown in FIG. 15, the panel constant can be easily set by changing the number of bellows by using a bellows-like biasing member 34a.

Also, as shown in Fig. 16, the upper part of the piston head 20 is opened, and a lid 34 c incorporating an arc-shaped urging member 34 b having a large diameter is fixed to the piston head 20. May be brought into contact with the biasing member 34b. In this way, the setting of the biasing force can be finely performed by using the large biasing member 34, and the assembling becomes easy.

Therefore, in the container 11 provided with the pump unit of such an embodiment, the liquid does not leak even if it falls down, the operability is good, and the "dent" can be reliably prevented. Industrial potential

In the pump unit according to the present invention, the communication hole is not opened unless the piston part is pressed, so that the liquid inside is not only when the container falls down but also when the container body is stepped on. It does not leak out.

In addition, in the pump unit according to the present invention, the communication hole is not opened unless the piston head is pressed, so that the inside of the container is not limited to the case where the container falls down, and even if the container body is stepped on. No liquid leaks out. In addition, when the piston shaft is inserted into the shaft case in this manner, the pushing operation of the piston shaft does not apply any force in the compression direction to the bellows, so that the bellows do not set.

Further, in the pump unit according to the present invention, since the locked state of the shaft case and the biston shaft by the locking portion is released, the biston shaft can be inserted into the shaft case, so that the pump unit is transported again. In this case, the size can be reduced and it is convenient to carry.

Further, in the pump unit according to the present invention, air leakage from between the inner peripheral surface of the bush cap and the outer peripheral surface of the shaft case can be shut off by the seal projection of the shaft case coming into contact with the inclined surface. In addition, when the shaft case is lowered, the contact between the inclined surface of the bush cap and the seal projection of the shaft case is released, so that air from between the inner peripheral surface of the bush cap and the outer peripheral surface of the shaft case is formed. Entry and exit can be secured to prevent “dents”. Further, for example, when an external pressure is applied to the container body, the inner cylindrical portion is pressed against the seal projection, so that leakage can be reliably prevented.

In addition, the container according to the present invention does not leak even if the container falls over or is stepped on, so that the container is easy to handle.

Claims

The scope of the claims

1. In the pump unit that is introduced into the container body and sucks the solution in the container body out of the container body,

A suction pipe inserted into the container body,

A bellows-like bellows connected to the upper part of the suction pipe and capable of returning in the direction of extension;

A piston portion that communicates with the upper part of the bellows to expand and contract the bellows, and that sucks the liquid in the container body out of the container body via the suction pipe;

A suction valve that allows only the inflow of liquid from inside the container body into the bellows is provided upstream of the bellows,

The biston portion is composed of a biston body and a sub-biston attached so as to be able to move a predetermined stroke in the compression direction of the bellows,

Prior to the bellows compression operation by the piston part, a communication hole is provided for opening the discharge passage in the piston part when the sub-biston moves a predetermined stroke with respect to the body of the piston.

A pump unit provided with an urging member between the biston body and the sub-piston for urging both in a direction to close the communication hole.

2. The piston body is

A pipe-shaped shaft case connected to the upper part of the bellows and held at the mouth of the container body;

A pipe-shaped biston shaft movably inserted into the upper part of the shaft case with respect to the shaft case;

A piston head connected to the upper end of the sub-viston, and a locking portion for locking the piston shaft with the piston shaft pulled out from the shaft case between the shaft case and the piston shaft;

2. The pump unit according to claim 1, wherein said piston head is provided with an engagement portion which engages with and is fixed to an opening of said container body.

3. The Bonunit according to claim 2, wherein said locking portion is configured to be unlockable.

4. The biston body is provided with a pipe-shaped shaft case which is connected to the upper part of the bellows and held at the mouth of the container body,

A bush cap for holding the shaft case is attached to the mouth of the container body,

The bush cap is provided with an inclined surface at a lower end portion of an inner cylindrical portion disposed in a mouth portion of the container body,

2. The pump unit according to claim 1, wherein the shaft case is provided with a seal protrusion that comes into contact with the inclined surface of the inner cylindrical portion so as to be separated therefrom.

5. A container provided with the pump unit according to any one of claims 1 to 4.