JPH10157751A - Backflow preventive tool in tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for preventing a viscous fluid from flowing back from the extruding opening of a tube charged with the fluid. SOLUTION: The tool for preventing flowing back, is provided with a valve 3 fitted to an extruding opening 2 of a tube 1 charged with a viscous liquid to prevent it from flowing back into the tube. It is more preferable that a female screw part 5 engaging with a male screw 4 formed at the outer peripheral part of the extruding opening 2 is provided at the inner peripheral part of one end of a cylindrical body 6 and a male screw part 8 engaging with a female screw part formed at the inner peripheral part of the cap 7 is provided at the outer peripheral part of the other end of the cylindrical body 6 and further, the valve 3 preventing the liquid from flowing back into the tube 1 is provided between both ends of the cylindrical body 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow preventing device for a tube filled with a viscous flow agent such as a cosmetic gel.

[0002]

2. Description of the Related Art Conventionally, viscous flow agents such as gel-like cosmetics and hand creams are commercially available after being filled in laminate tubes. As is well known, a tube of this type is used by pressing the tube from the surroundings to extrude an appropriate amount of an internal viscous fluid through an extrusion port at the tip of the tube. A screw-in cap and a click-lock cap are detachably attached to the outlet at the end of the tube. Conventionally, the cap shuts off the outside air and prevents contamination of the germs into the tube. However, the viscous fluid may flow backward in the tube due to the elastic restoring force of the tube itself, and accordingly, outside air may enter the tube and bacteria may propagate in the tube. For this reason, preservatives are almost always mixed in this type of viscous flow agent.

[0003]

However, it is strongly desired that cosmetics directly applied to bare skin sensitive to chemicals do not contain impurities such as preservatives. In addition, impurities such as preservatives do not have to be used in foods such as mustard paste, paste wasabi and the like, and also in medicines used in the oral cavity such as toothpaste.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a means for preventing a backflow of a tube filled with a viscous flowing agent from an extrusion port into the tube. It is in.

[0005]

SUMMARY OF THE INVENTION In the tube backflow prevention device according to the present invention, in order to solve the above-mentioned problems,
As shown in FIG. 1, a tube 1 filled with a viscous flow agent
And a valve 3 attached to the extrusion port 2 for preventing backflow into the tube 1. More preferably, a female screw part 5 screwed into a male screw part 4 formed on the outer peripheral part of the extrusion port 2 of the tube 1 is provided at one inner peripheral part of one end of the cylindrical body 6. The outer peripheral portion has a male screw portion 8 screwed to a female screw portion (not shown) formed on the inner circumferential portion of the cap 7, and a backflow into the tube 1 is caused between both ends of the cylindrical body 6. A structure with a blocking valve 3 is suitable. Further, a female screw portion 5 formed on an inner peripheral portion of one end of the cylindrical body 6
If the male screw part 8 formed on the other end outer peripheral part has the same diameter and the same pitch, the female screw part formed on the inner peripheral part of the cap 7 becomes the outer peripheral part of the extrusion port 2 of the tube 1. Can be screwed into the male screw portion 4 formed in the above, and the tube cap can be used as it is.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a configuration of the first embodiment of the present invention, and a portion of a backflow prevention device has a cross-sectional structure. In the figure, 1 is a tube 1 filled with a viscous flow agent
A male screw portion 4 for mounting the backflow prevention device of the present invention is formed on the outer peripheral portion of the extrusion port 2.

FIG. 2 is a sectional view showing the structure of the backflow preventer according to the first embodiment of the present invention. This backflow prevention device is formed of a cylindrical body 6 having both ends opened, and has a female screw portion 5 screwed to the male screw portion 4 of the tube 1 at one end inner peripheral portion.
Further, a male screw portion 8 which is screwed to a female screw portion formed on the inner peripheral portion of the cap 7 is provided on the outer peripheral portion of the other end of the cylindrical body 6. Further, a valve 3 for preventing backflow into the tube 1 is formed at an intermediate portion of the tubular body 6. The one-dot chain line in the figure is the distal end face of the extrusion port 2 of the tube 1. When the female screw part 5 of the tubular body 6 is screwed into the male screw part 4 of the extrusion port 2 of the tube 1, the valve 3 To come into contact with the back surface of the

FIG. 3 shows an example of the structure of the valve 3. FIG. 3 shows the structure when viewed from the outside (the upper side in FIG. 1 or 2) along the axial direction of the backflow prevention device, and has a membrane having an outer diameter slightly smaller than the inner diameter of the cylindrical body 6. Valve 3
Are deformably supported on the inner wall of the tubular body 6. In the drawing, 9 indicated by a broken-line circle is the inner wall of the extrusion port 2 of the tube 1. Normally, the back surface of the valve 3 is in contact with the tip surface of the extrusion port 2 of the tube 1, so that backflow into the tube 1 is prevented. Also, when using the tube 1
Is pressed from the surroundings, whereby the viscous fluid in the tube is pushed out from the inner wall 9 of the extrusion port 2 of the tube 1 while pushing up the valve 3. It is preferable that the valve 3 itself has a sufficient elastic restoring force. However, even if the elastic restoring force of the valve 3 is weak, the outer periphery of the back surface of the valve 3 is formed on the tip surface of the extrusion port 2 of the tube 1. , The surface tension of the viscous flow agent acts on the contact surface, whereby the closing of the valve 3 is guaranteed.

FIG. 4 is a sectional view showing the structure of the second embodiment of the present invention. In the present embodiment, a female screw part 5 formed on the inner peripheral part of one end of the cylindrical body 6 and a male screw part 8 formed on the outer peripheral part of the other end are formed.
Have the same diameter and the same pitch. By doing so, the female screw portion formed on the inner peripheral portion of the cap 7 can be screwed into the male screw portion 4 formed on the outer peripheral portion of the extrusion port 2 of the tube 1, and the tube cap is formed. Can be used as it is. The dashed line in the figure indicates the tube 1
2 shows the tip end surface of the extrusion port 2 of FIG.

FIG. 5 is a cross-sectional view showing the structure of a third embodiment of the present invention, in which the illustrated backflow preventer is adhered from the inner peripheral surface of the tube. The area A in the figure is adhered to the inner peripheral surface near the extrusion port of the tube. In this embodiment, the small-diameter portion 10 is provided so as to contact the back surface of the valve 3. Also,
FIG. 6 is a cross-sectional view showing the configuration of the fourth embodiment of the present invention, in which the illustrated backflow preventer is adhered from the outer peripheral surface of the tube. Region B in the figure is adhered to the outer peripheral surface near the extrusion port of the tube. In the structure of FIG. 6, the valve 3 comes into contact with the outlet of the tube, so that the small-diameter portion 10 as in the third embodiment need not be provided.

FIG. 7 is a sectional view showing the structure of a fifth embodiment of the present invention. In the present embodiment, a female screw part 5 screwed to a male screw part 4 formed on the outer peripheral part of the extrusion port 2 of the tube 1 filled with the viscous fluid is provided at one inner peripheral part of the cylindrical body 6. A click-lock type engaging claw 11 formed on the inside of the cap 7 and having an engaging projection 12 detachably mounted on an outer peripheral portion of the other end of the cylindrical body 6. Tube 1 between
It is provided with a valve 3 for preventing backflow into the inside. In this example,
As the valve 3, a donut-shaped elastic body is pressed into an intermediate portion of the cylindrical body 6. The elastic body may be a rubber product or may be filled with air pressure, but the flow path at the center is normally closed by the pressure received from the inner wall of the tubular body 6. When the internal pressure of the tube 1 is increased by pressing the tube 1 from the periphery, the flow path at the center is opened as shown by a broken line. In addition, a structure like a check valve in a vein of a human body may be used.
In short, a structure that can prevent backflow from the outside air into the tube, has high airtightness, and is easy to manufacture may be appropriately adopted.

FIG. 8 is a sectional view showing the structure of a sixth embodiment of the present invention. In this embodiment, a cylindrical body 6 having a valve for preventing backflow therein is pressed into the inner wall 9 of the extrusion port 2 of the tube 1. The outer diameter of the cylindrical body 6 is the same as the inner wall 9 of the extrusion port 2 of the tube 1. However, the portion to be inserted may be tapered. When such a tubular body 6 is press-fitted, the outer peripheral surface of the tubular body 6 and the inner wall 9 of the extrusion port 2 of the tube 1 are pressed.
Are in close contact with each other and do not come off easily. The structure of the valve provided inside the cylindrical body 6 is not particularly limited. However, if the following structure is adopted, the manufacturing cost can be extremely reduced.

FIG. 9 shows an example in which a spherical valve 3 is used. For example, a small plastic ball is loosely fitted to an intermediate portion of a cylindrical body 6. Above the cylindrical body 6 (corresponding to the upper side in FIG. 8), a flange 14 for retaining is provided. A ring 13 having an outer diameter equal to the inner diameter of the cylindrical body 6 is press-fitted below the cylindrical body 6 (corresponding to the lower side in FIG. 8). At the time of manufacture, the spherical valve 3 is inserted from the lower side of the cylindrical body 6, and then the ring 13 is press-fitted. Next, as shown in FIG. 8, the cylindrical body 6 is connected to the inner wall 9 of the extrusion port 2 of the tube 1.
And push it in until the upper side of the tubular body 6 is flush with the distal end face of the extrusion port 2 of the tube 1. In use, when the internal pressure of the tube 1 is increased by pressing the tube 1 from the surroundings, the spherical valve 3 moves to the position of the flange 14 due to the viscous fluid agent pushed out from the central opening of the ring 13, The viscous fluid is extruded from between the flanges 14 through the space between the valve 3 and the inner wall of the cylindrical body 6. When the compression of the tube 1 is released, the viscous fluid tends to flow backward, but the flow pushes the spherical valve 3 back to the position of the ring 13 and closes the central opening of the ring 13.
No outside air enters the tube. Further, as shown in FIG. 10, a membrane-shaped valve 3 supported on the inner wall of the cylindrical body 6 so as to be deformable may be used. The above-mentioned structure can be manufactured at very low cost by using a resin molded product, and can be applied to almost all tubes. Therefore, its application range is extremely wide.

[0014]

According to the present invention, it is possible to prevent backflow into the tube from the extrusion port of the tube filled with the viscous flow agent, so that there is no risk of contamination by bacteria in the tube. , It is possible to eliminate the need for preservatives mixed in viscous fluids, cosmetics, food,
The safety of drugs and the like can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view showing a main part of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a main part structure according to the first embodiment of the present invention.

FIG. 3 is a front view of the valve used in the first embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a main part structure according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a main part structure of a third embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a main part structure according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing a structure of a fifth embodiment of the present invention.

FIG. 8 is a sectional view showing a structure of a sixth embodiment of the present invention.

FIG. 9 is a cutaway perspective view showing a main part of a sixth embodiment of the present invention.

FIG. 10 is a cutaway perspective view showing a main part of a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Extrusion port 3 Valve 4 Male screw part 5 Female screw part 6 Cylindrical body 7 Cap 8 Male screw part

Claims (7)

[Claims] An apparatus for preventing backflow of a tube, comprising a valve mounted on an extrusion port of the tube filled with a viscous fluid agent to prevent backflow into the tube. 2. A cylindrical body having a female screw portion screwed to a male screw portion formed on an outer peripheral portion of an extruding port of a tube filled with a viscous fluid agent, and having an inner peripheral portion of a cap. A male screw part to be screwed into the female screw part formed in the part is provided on the outer periphery of the other end of the cylindrical body, and a valve for preventing backflow into the tube is provided between both ends of the cylindrical body. Characteristic tube backflow prevention device. 3. A female screw portion formed on an inner peripheral portion of one end of the cylindrical body and a male screw portion formed on an outer peripheral portion of the other end have the same diameter and the same pitch. A tube backflow preventer as described. 4. A backflow preventing device for a tube, comprising a valve adhered from an outer peripheral surface to an extrusion port of the tube filled with a viscous flowing agent to prevent a backflow into the tube. 5. A device for preventing backflow of a tube, comprising a valve which is adhered from an inner peripheral surface to an extrusion port of the tube filled with a viscous flow agent to prevent backflow into the tube. 6. A cylindrical member having a female screw portion, which is screwed to a male screw portion formed on an outer peripheral portion of an extrusion port of a tube filled with a viscous flowing agent, at one end inner peripheral portion, and is provided inside a cap. The formed click-lock type engaging claw has an engaging projection detachably provided on an outer peripheral portion of the other end of the tubular body, and prevents backflow into the tube between both ends of the tubular body. A tube backflow prevention device comprising a valve. 7. A tube backflow prevention device comprising a valve which is press-fitted into an inner wall of an extrusion port of a tube filled with a viscous flowing agent to prevent backflow into the tube.