JPH07251851A - Container with screw cap - Google Patents

Abstract

PURPOSE:To easily manufacture with a simple structure and further to easily attach additional functions such as positioning of a terminal end for screwing and locking. CONSTITUTION:This container with screw cap includes a container body 1 having a port 3 and a screw cap 5 to be engaged in the port 3. The screw cap 5 has an inner face with a spiral groove 35 drilled, while the port 3 has an outer face with a protrusion 21 to be screwed with the spiral groove 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container with a screw cap, such as a container for cosmetics or a container for chemicals. More specifically, the present invention relates to a container with a screw cap, which has a container opening or a screw cap having a protrusion that functions as a male screw and has a simple structure and is easy to manufacture. Furthermore, the present invention relates to a container with a screw cap, which is also excellent in additional functions such as positioning of the screw-in terminal and locking.

[0002]

2. Description of the Related Art In a conventional container with a screw cap,
A screw having a certain cross-sectional shape was continuously cut on both the container mouth and the cap. This is because it was taken for granted from the common sense of screws.
However, upon careful consideration, it is often the case that it is not necessary for the screws of many container with screw caps to have continuous threads of a certain cross-sectional shape. A "screw" may be one in which one or more or a plurality of protrusions having an appropriate shape are intermittently arranged at required points of such a virtual continuous screw. However, no one noticed this.

[0003]

The conventional container with a screw cap as described above has the following problems. It was necessary to mold the male thread made of glass or plastic using a screw-shaped mold. Therefore, the cost of the mold was high. When molding the above mold into two parts, the parting line always appeared on the screw surface.
Therefore, it takes time and care for the maintenance. In the above case, it is necessary to avoid undercutting of the screw, and there are restrictions on the screw shape and pitch. Since both male and female threads have a loose taper at the beginning of thread cutting, it was impossible to define a clear screw-in end with both. Therefore, cap overrun (screw overtightening) occurred.

For the same reason as above, when it is necessary to keep the mounting angle of the cap on the container constant (for example, when the square cap is attached to the square container in an angled state), the stopper is provided separately from the screw. I had to set it up. It was also difficult to do work such as loosening prevention with screws.

It is an object of the present invention to provide a container with a screw cap, which has a simple structure and is easy to manufacture, and which is easily provided with additional functions such as positioning of a screw-in end and locking.

[0007]

In order to solve the above problems, a container with a screw cap according to the present invention comprises a container body having a mouth and a screw cap engaging with the mouth. Container with a screw cap;
The present invention is characterized in that the spiral groove has an inner surface that is cut, and the mouth portion has an outer surface that is provided with a projection that is screwed into the spiral groove.

[0008]

Operation: The spiral groove on the inner surface of the screw cap and the projection on the outer surface of the mouth are screwed together. As a result, the screw cap is detachably attached to the mouth of the container. A spiral groove may be cut on the inner surface of the mouth portion and a protrusion may be provided on the outer surface of the screw cap. Furthermore, a spiral groove may be provided on the outer surface of the screw cap or the mouth portion, and a protrusion that is screwed into the spiral groove may be provided on the outer surface of the mouth portion or the screw cap. Even if the number of protrusions is 1,
There may be more than one. From the viewpoint of strength and manufacturing, it is preferable to remove the paring line and provide a large number of them in a row.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings. Figure 1
It is sectional drawing of the mouth part periphery of the container with a screw cap which concerns on one Example of this invention. FIG. 2 is a cross-sectional view showing a II-II cross section of FIG. 1.

As shown in FIG. 1, the screw cap 5 is screwed to the mouth portion 3 of the container body 1. Also,
The packing 7 is sandwiched between the upper end 29 of the mouth portion 3 and the lower surface of the top portion 39 of the screw cap 5. The container body 1 of this embodiment is a glass bottle. The upper part of the main body 1 has a shoulder 11
To form a cylindrical mouth 3. Inner hole 2 of mouth 3
Reference numeral 5 is a straight circular cross-section hole, which communicates with the inside of the main body 1.

The outer surface 25 of the mouth portion 3 is also a cylindrical surface.
On this outer surface 25, a group of hemispherical projections 21, 27 are formed.
They are arranged side by side in the up-down direction and distributed by 90 °. Eight protrusions are provided in one row in the vertical direction at equal pitches. Of the eight projections, the topmost one (the one that fits all the way into the screw cap) is especially the innermost projection 2
Call 7. These protrusions 21 and 27 are screwed into a spiral groove 35 on the inner surface 33 of the screw cap, which will be described later. In this case, the group of protrusions 21 and 27 is provided so that the group of protrusions occupy a part of a virtual spiral space screwed into the spiral groove.

The screw cap 5 has a generally cylindrical shape with a top. The lower end portion of the screw cap 5 has a hook portion 31 whose inner surface is straight. This hook part 31
When the screw cap 5 is attached to the container body opening portion 3, it fits into the straight portion at the upper end of the container body opening portion 3 and serves as a guide. A spiral groove 35 is cut in the central portion of the inner surface 33 of the screw cap 5 in the vertical direction over more than half the height of the screw cap 5. The spiral groove 35 is a four-thread screw having a semicircular cross section. Spiral groove 3
The pitch of 5 is a group of protrusions 21 on the outer surface of the container body opening 3.
Equal to 27 pitches. The spiral groove 35 and the group of protrusions 21 and 27 are screwed together like a female screw and a male screw.

Contrary to the embodiment shown in FIG. 1, the screw cap is formed into a cork plug shape (male) and a group of protrusions is provided on the outer surface thereof, and the spiral groove is cut on the inner surface of the container mouth portion to close the screw cap. It may be screwed into the inner surface of the mouth of the container. The number of threads and the cross-sectional shape of the spiral groove are not limited to those in this embodiment. The spiral groove cross-sectional shape may be triangular, square, elliptical, or the like. The shape of the protrusion may be an elliptic hemisphere, a rectangular parallelepiped, or the like in addition to the hemisphere. The array state of the group of protrusions is not limited to the linear shape, and may be a twisted shape, a scattered shape, or the like.

The structure of the innermost portion of the spiral groove 35 will be described with reference to FIG. The innermost part of the spiral groove 35 is 1
It is the innermost wall 43 of the spiral groove having a / 4 spherical shape. The innermost projection 27 comes into contact with the innermost wall 43, and the projection 2
7 does not go in the back (does not overrun). Therefore, the threaded end of the screw cap is determined.

The spiral groove 3 in front of the innermost wall 43 (on the left side of the drawing)
5 is a small protrusion at the bottom of the inner protrusion 4 for locking.
It is 1. The head of the innermost protrusion 27 interferes with the loosening preventing inner protrusion 41 immediately before the screwing end. Therefore, it gives resistance to the hand of the person who is screwing the cap into the container mouth, but if the cap is twisted with a little more force, the innermost protrusion 27 of the innermost portion will get over the loosening prevention inner protrusion 41. (Actually, the loosening prevention inner protrusion 41 and the screw cap 5 main body are deformed), and the spiral groove innermost wall 43
Abut. After that, the loosening prevention protrusion 41 functions to prevent the innermost protrusion 27 from unintentionally retracting, and serves to prevent the screw cap from loosening.

At the screwed end of the screw cap, the packing 7 is sandwiched between the container mouth upper end 29 and the screw cap top 39 lower surface with just the right pressure. The shape of the innermost wall of the spiral groove may be like a flat wall. Alternatively, the locking protrusion 41 may be bent so as to move to the outside of the cap.

A method of manufacturing the container with the screw cap of this embodiment will be described. The screw cap is a plastic injection molded product. The material can be selected from polypropylene, low-pressure polymerized polyethylene, ABS, AS, POM and the like. Inner protrusion 4 for preventing loosening of the spiral groove 35
1 and the packing holding projection 38 interfere with the die core pin at the time of die cutting, but the cap can be slightly deformed to perform the die cutting (stripper method).

The container body may be a glass bottle, a plastic container (such as a blow molded product), or the like.

FIG. 3 is a sectional view of the vicinity of the mouth of a container with a screw cap according to another embodiment of the present invention. In the container of FIG. 3, one protrusion 21 is provided on the outer surface of the mouth portion 3 so as to project. Further, the number of the spiral groove 31 on the inner surface of the cap 5 is one.

FIG. 4 is a side view showing various patterns for arranging the protrusions on the outer surface of the mouth of the container. FIG. 4A is an example in which only one protrusion 21 is provided as in the embodiment of FIG.
(B) is an example in which a pair of protrusions are provided at the same height on the left and right. (C) is an example in which they are arranged in a line in the height direction. The arrangement of the protrusions can be variously selected depending on the use of the container and the required strength. Also on the spiral groove side, various selections can be made in accordance with the number of threads and the pitch according to the arrangement of the protrusions.

[0021]

As is apparent from the above description, the container with the screw cap of the present invention exhibits the following effects. Since it is not necessary to mold a male thread portion made of glass or plastic using a screw-shaped mold, the cost of the mold can be reduced. The parting line can be prevented from coming onto the projection even when the mouth of the container is molded with a split mold. Therefore, there is little labor for maintenance. Even in the above case, the screw pitch is not restricted. Since the screw groove and the protrusion can define a clear screw-in end, overrun of the cap (overtightening of the screw) does not occur. For the same reason as above, even when the attachment angle of the cap to the container must be kept in a certain state (when attaching the square cap to the square container), it is not necessary to provide a stopper or the like separately from the screw. Work such as loosening prevention can be easily done with the screw part.

[Brief description of drawings]

FIG. 1 is a cross-sectional view around a mouth portion of a container with a screw cap according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a II-II cross section of FIG.

FIG. 3 is a cross-sectional view of the vicinity of a mouth portion of a container with a screw cap according to another embodiment of the present invention.

FIG. 4 is a side view showing various patterns for arranging protrusions on the outer surface of the mouth of the container.

[Explanation of symbols]

1 Container Main Body 3 Mouth 5 Screw Cap 7 Packing 11 Shoulder 21 Protrusion 23 Outer Surface 25 Inner Hole 27 Innermost Protrusion 29 Mouth Upper End 31 Hammer 33 Inner 35 Solenoid Groove 37 Back Inner 38 Packing Retaining Protrusion 39 Top 41 Loosening Stop Inner protrusion 43 Helical groove innermost wall

Claims (6)

[Claims] 1. A container with a screw cap, comprising: a container body having a mouth portion; and a screw cap that engages with the mouth portion; the screw cap having an inner surface in which a spiral groove is cut, A container with a screw cap, wherein the mouth portion has an outer surface provided with a protrusion to be screwed into the spiral groove. 2. A container with a screw cap, comprising: a container body having a mouth portion; and a screw cap engaging with the mouth portion; the mouth portion having an inner surface with a spiral groove cut, A container with a screw cap, wherein the screw cap has an outer surface provided with a protrusion that is screwed into the spiral groove. 3. The container with a screw cap according to claim 1, wherein a large number of the protrusions are arranged so as to occupy a part of a virtual spiral space screwed into the spiral groove. 4. The container with a screw cap according to claim 1, 2 or 3, wherein a locking member is provided in the spiral groove. 5. The screwed end of the cap is defined by the innermost protrusion of the protrusions when the cap is attached, abutting the innermost wall of the spiral groove. Container with screw cap. 6. An inner protrusion for preventing loosening is provided in the spiral groove in front of the innermost wall of the spiral groove, and the protrusion of the innermost portion rides over the inner protrusion for preventing loosening and reaches the innermost part of the spiral groove. The screw cap container according to any one of claims 1 to 5, wherein the cap is completely screwed in, and the protrusion at the innermost portion is prevented from being unexpectedly retracted by the loosening preventing inner protrusion.