JPH0330273Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to paper boxes, synthetic resin-treated paper boxes, cans,
This invention relates to a container opening/closing device used at the mouth of a container such as a bottle.

[Prior Art] The inventor of this invention previously devised a container closing device as shown in FIG. 5, and disclosed the application. (Utility Model Registration Application No. 58-181998), according to this applied invention, as shown in FIG. When it is tightened downward, the short cylindrical convex part d of the outer cover a is formed with a larger diameter than the inner diameter of the screw tube c, so the pressure contact between the two d and c is strengthened, improving the sealing performance. It is becoming possible to do so. e is the attachment part, f
indicates a container, and g indicates a fissure. In addition, h is a mouth wall that blocks the passage of liquid, etc., and i is a tearing member such as a pull ring provided on the inner upper surface of the fissure g of the mouth wall h.
j is the outer surface of the convex portion d, and k is the inner surface of the upper end of the outer cover a. A user such as a consumer removes the outer cover a, pinches the tearing member i, and pulls it upward to release the tear groove g.
A doorway is formed. A user etc. pours out the liquid etc. in the container f from this port and uses it.

This closure device is widely used because it provides pulsation closure until the first use.

[Problems to be Solved by the Invention] However, the disclosed closure device has the following drawbacks. That is, the upper end of the screw tube c presses against the inner surface j of the convex portion d and the inner surface k of the upper end portion of the outer cover a to achieve a seal. The outer surface j and the inner surface k of the upper end of the outer cover a are both flat or nearly flat, so the contact area is large, and therefore the pressure per unit area is relatively small, making it difficult to improve sealing. It is.

This invention was made in order to solve such problems, and its purpose is to improve the sealing performance between the upper end of the screw and the lid in a screw-type container opening/closing device made of synthetic resin. It is an object of the present invention to provide a container opening/closing device that can be further improved than those already disclosed.

Furthermore, in such a case, to provide an opening/closing device for a container which allows the lid to be relatively easily closed and which does not easily open when the lid is opened, for example, when the lid falls over. It is.

[Means for solving the problem] This invention that achieves the above purpose is described as follows: A mounting part 1 made of synthetic resin and attached to a container.
A spout 3a consisting of a screw tube 3 having a thread 2 on the outside, a protrusion 4 provided on the outer periphery of the upper end of the screw tube 3, and a spout 3a provided on the upper side of the protrusion 4 outward A bulging portion 5 bulges diagonally upward, an undercut 6 formed outward and diagonally downward below the protrusion 4, and a cross section formed by the bulging portion 5 and undercut 6. The protrusion 4 is formed into a substantially beak shape, the lid body 7 is made of synthetic resin and has a top wall 8 and a cylindrical part 10 and has a harder hardness than the spout 3a, and is screwed onto the screw tube 3. This container opening/closing device is characterized by comprising a pressure contact portion 12 formed on the inner surface of the upper end of a cylindrical portion 10 and having a slightly smaller diameter than the protrusion 4.

[Operation] The lid 7 is screwed into the screw tube 3 of the spout 3a, and is screwed forward, so that the protrusion 4 of the screw tube 3 is connected to the screw tube 3 of the spout 3a.
It is screwed into contact with a press-contact portion formed on the inner surface of the upper end and having a diameter slightly smaller than that of the protrusion 4. In this case, since the protrusion 4 is formed into a substantially beak-like cross section by the bulge 5 and the undercut 6, it is structurally easy to bend downward and difficult to bend upward, and is also formed as described above. Lid body 7
is made of a synthetic resin that is harder than the synthetic resin that forms the spout 3a, so it can be elastically deformed downward and bent relatively easily by the lid 7, and the upper end of the lid 7 can be bent. It comes into pressure contact with the pressure contact portion 12 on the inner surface. In this case, the parts that come into pressure contact are the tip of the protrusion 4 and the pressure contact part 12 of the lid 7, as described above.

Therefore, the pressure contact area is much smaller than that of the conventional example, and the pressure per unit area is therefore much greater than that of the conventional example, and as a result, the sealing performance can be improved. In addition, as mentioned above, the protrusion 4 has the bulge 5 formed at the upper part and the undercut 6 at the lower part, and is formed into a substantially beak-like cross section, so that it is easy to bend downward and difficult to bend upward. Therefore, during the closing stroke by screwing the lid 7, it can be closed relatively easily. Furthermore, when the lid 7 is opened, the protrusion 4 is formed so that it does not easily bend upward, so it does not open easily and prevents the lid 7 from opening when the container falls over. reliability can be improved.

[Embodiment] In FIG. 1, reference numeral 1 denotes a mounting portion for a container, and as an example, a substantially flat plate-shaped mounting portion for a carton is formed. However, if the container is a bottle or the like, it is of course possible to use a screw-fitting or press-fitting type.

Reference numeral 2 indicates a thread formed on the screw tube 3 integrally formed with the mounting portion 1, and reference numeral 4 indicates a protrusion formed on the outer periphery of the upper end of the screw tube 3. As shown in the figure, there is a bulge 5 at the top, outward, and diagonally upward.
An undercut 6 is formed on the lower side of the protrusion 4 outwardly and diagonally downward, and the cross section is approximately beak-shaped, and the slope α of the bulge of the bulge 5 is also large and small. It may be formed in various forms.

In the case shown in Fig. 2, the protruding portion 5 of the protrusion 4 is formed to have a substantially arc-shaped cross section, and in the case shown in Fig. 3, the angle α of the protruding portion 5 with respect to the horizontal is approximately 45 degrees. The one shown in Figure 4 has the same angle α as approximately
It is formed at 30 degrees. These protrusions 4 are designed to be easily deformed as the angle α decreases. 6a indicates the tip of the protrusion 4.

Next, reference numeral 7 denotes a lid body, which is made of a synthetic resin having a harder hardness than the spout 3a, such as polypropylene, and the spout 3a is made of polyethylene, as an example.

In FIG. 1, 8 is a top wall, 9 is an inner cylinder, and 11 is a screw groove, and the inner cylinder 9 is in pressure contact with the inner surface of the upper end of the screw cylinder 3. Further, in the figure, 14 indicates a mouth wall that blocks passage of liquid, 15 indicates an endless fissure groove formed in the mouth wall 14, and 16 indicates a tearing member in the form of a pull ring.

[Effects of the invention] This invention is constructed as described above, and the spout 3a
Since the protrusion 4 is provided on the outer periphery of the upper end of the screw tube 3, when the tip of the protrusion 4 comes into pressure contact with the pressure contact part 12 formed on the inner surface of the upper end of the lid body 7, the contact area is It is greatly reduced compared to the conventional example,
As a result, the pressure per unit area becomes significantly higher, so the sealing force can be greatly improved. Further, a bulging portion 5 is bulged outward and diagonally upward on the upper side of the protrusion 4, and an undercut 6 is formed outward and diagonally downward on the lower side of the protrusion 4,
Since the protrusion 4 has a substantially beak-like cross-section, the cross-sectional shape makes it easy to bend downward and difficult to bend upward, and the lid 7 forms the spout 3a. Since it is made of a synthetic resin that is harder than the synthetic resin used for the lid 7, it is relatively easily elastically deformed and bent downward by the lid 7, and therefore, during the closing stroke by the screwing of the lid 7, , it can be closed relatively easily. Also, when the lid body 7 is opened, the protrusion 4
Since it is formed so that it is difficult to bend upward, it will not open easily, and it is possible to increase the reliability that the lid body 7 will not open when the container is overturned.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention,
Figure 1 is a cross-sectional view of the container opening/closing device, and Figure 2 is a cross-sectional view of the container opening/closing device.
3 is a diagram corresponding to FIG. 2 showing another embodiment of this invention; FIG. 4 is a diagram corresponding to FIG. 2 showing still another embodiment of this invention; FIG. 5 is a sectional view of a closure device for containers, etc., which the inventor of this invention previously disclosed in his application. 1... Mounting part, 2... Screw, 3... Spiral tube, 3a
... Spout, 4... Projection, 5... Swelling part, 6... Undercut, 7... Lid, 8... Top wall, 10...
...Cylinder part, 12... Pressure contact part.

Claims (1)

[Scope of utility model registration request] A spout 3a consisting of a screw tube 3 having a thread 2 on the outside, which is provided on a mounting part 1 made of synthetic resin and attached to a container; a protrusion 4 provided on the outer periphery of the upper end of the screw tube 3; A bulging portion 5 bulging outward and diagonally upward on the upper side of the protrusion 4; an undercut 6 formed outward and diagonally downward on the lower side of the protrusion 4; The protrusion 4 is formed into a substantially beak-shaped cross section by the bulge 5 and the undercut 6.
and a top wall 8 and a cylindrical portion 10 that are screwed into the screw tube 3.
A cover body 7 made of synthetic resin and having a harder hardness than the spout 3a, and a pressure contact part 12 formed on the inner surface of the upper end of the cylinder part 10 and having a slightly smaller diameter than the protrusion 4. Opening/closing device for containers.