JP4729156B2 - cap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap that is screwed into a mouth portion of a container such as a tube or bottle filled with pharmaceuticals or cosmetics, and relates to a cap that is beautiful in appearance while preventing sinking of the outer peripheral surface of the cap that occurs after molding of the cap.
[0002]
[Prior art]
As shown in FIG. 5, the conventional cap 50 is provided with a top wall 52 in the middle portion of a cylindrical outer peripheral wall 51, and a female screw portion 53 is provided below the top wall 52 on the inner surface of the outer peripheral wall 51. It was equipped with. And such a cap 50 was mass-produced with the metal mold | die by the normal injection molding method.
[0003]
[Problems to be solved by the invention]
However, in the conventional cap 50, sink marks 55 are generated on the side surfaces of the outer peripheral wall 51 of the portion 54 where the outer peripheral wall 51 and the top wall 52 intersect with each other as shown in FIG. 5, and the appearance of the cap 50 becomes worse. There was a problem. This occurs because when the cap 50 is naturally cooled after being taken out of the mold, the top wall 52 tends to contract in the center direction and pulls the material of the outer peripheral wall 51. It has been found that when the top wall 52 is thick (the cross-sectional area is large), the shrinkage force increases and the material is pulled more prominently.
[0004]
This invention was made paying attention to such a conventional subject, and it aims at providing the cap which prevented the sink mark which generate | occur | produces in the side surface of an outer peripheral wall of the site | part which an outer peripheral wall and a ceiling wall cross | intersect. To do.
[0005]
[Means for Solving the Problems]
To solve this problem, it means corresponding to the first aspect of the invention is composed of a cylindrical peripheral wall, a top wall provided at the intermediate portion of the peripheral wall, the top wall of the peripheral wall inner surface includes a female threaded portion on the lower side fraction in the cap tightening screwed the female screw portion to the mouth portion of the container, the lower portion of the peripheral wall, the annular groove toward the lower end thereof upward formation is, by the groove portion is formed, and the outer peripheral wall, and the inner of the inner peripheral wall of the outer wall is provided, the female screw is provided on the inner surface of the inner peripheral wall, by deeply forming the groove, a site where the outer peripheral wall and the top wall intersect, so as to form a thin wall portion formed thinner than the thickness of the portion of the other top wall, connecting the outer peripheral wall, inner wall and a top wall, a plurality It is a cap characterized by forming a reinforcing rib .
[0006]
Means corresponding to the invention of 請 Motomeko 2 wherein is a cap, characterized in that the formation of the needle body on the upper surface of the top wall.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 to 3 are drawings showing a first embodiment according to the present invention. The outer peripheral wall 1a is a cylindrical outer peripheral wall, and a ceiling wall 2 is formed in the approximate middle of the outer peripheral wall 1a. And the thin part 2a is formed in the site | part (base part of the top wall 2) where the outer peripheral wall 1a and the top wall 2 cross | intersect by cutting the groove part 3 deeply. The thickness of the thin portion 2a is thinner than the thick portion 2b near the center of the top wall 2. It is preferable that the thin portion 2a (H) / thick portion 2b (K) × 100 = 20 to 80%.
[0008]
And since the top wall 2 is connected with the outer peripheral wall 1a by the thin part 2a, there exists a possibility that the intensity | strength of the thin part 2a vicinity may become weak depending on the raw material which comprises the cap 1. FIG. That is, when the cap 1 is inadvertently tightened when the female screw portion 4 of the cap 1 is screwed into the mouth of a tube container or a bottle container, a crack occurs in the thin portion 2a of the top wall 2. There is a fear.
[0009]
Therefore, in order to reinforce the vicinity of the thin portion 2a where the outer peripheral wall 1 and the top wall 2 intersect, the groove portion 3 has a plurality of reinforcing ribs 5 so as to connect the outer peripheral wall 1a, the inner peripheral wall 1b, and the top wall 2. Is provided. In 1st Embodiment shown in FIGS. 1-3, the circumference of the top | upper surface of the groove part 3 is divided into 6 equally, and the reinforcement rib 5 is formed in 6 places. The number of the reinforcing ribs 5 can be arbitrarily determined in consideration of the rigidity of the material constituting the cap 1 and the strength of the thin portion 2a. Moreover, the shape of the reinforcing rib 5 is a longitudinal section trapezoid, a longitudinal section rectangle, a longitudinal section triangle, or the like.
[0010]
FIG. 4 is a drawing showing a second embodiment according to the present invention. A feature of this embodiment is that a needle body 6 for breaking a sealing lid formed at the mouth of a tube container or the like is formed at the center of the top surface of the top wall 2 of the cap 1. Other configurations are the same as those of the first embodiment.
[0011]
Next, the operation of the present invention will be described. In the first embodiment, since the thin wall portion 2a is formed at the portion where the outer peripheral wall 1a and the top wall 2 intersect, when the cap 1 is molded with a mold and then naturally cooled, the thin wall of the top wall 2 is formed. The contraction force of the portion 2a is small, and the force that pulls the wall thickness of the side surface of the outer peripheral wall 1a toward the center of the top wall 2 is small. Therefore, it can prevent that the side surface of the outer peripheral wall 1a is pulled and sink marks are generated. Further, since the plurality of reinforcing ribs 5 are formed so as to connect the outer peripheral wall 1a and the top wall 2, the thin-walled portion 2a is reinforced, and the thin-walled portion 2a is tightened to the container mouth portion of the cap 1 carelessly. It is possible to prevent cracks from occurring.
[0012]
【The invention's effect】
As described above, according to the present invention, sinks generated on the side surfaces of the outer peripheral wall can be completely prevented at the portion where the outer peripheral wall 1a and the top wall 2 of the cap intersect, and the cap that is beautiful in appearance is mass-produced. can do.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first embodiment according to the present invention (a sectional view taken along line AA in FIG. 2).
FIG. 2 is a bottom view showing the first embodiment according to the present invention.
3 is a sectional view showing the first embodiment according to the present invention (a sectional view taken along line BB in FIG. 2).
FIG. 4 is a cross-sectional view showing a second embodiment according to the present invention.
FIG. 5 is a cross-sectional view showing a conventional cap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap 1a Outer peripheral wall 1b Inner peripheral wall 2 Top wall 2a Thin part 3 Groove part 4 Male thread part 5 Reinforcement rib

Claims (2)

It comprises a cylindrical peripheral wall and a top wall provided in the middle part of the peripheral wall, and is provided with a female screw part on the lower part of the top wall of the inner surface of the peripheral wall. In the cap screwed onto and tightened,
In the lower part of the peripheral wall, an annular groove is formed upward from the lower end thereof,
By forming the groove, an outer peripheral wall and an inner peripheral wall inside the outer peripheral wall are provided,
The female screw is provided on the inner surface of the inner peripheral wall,
By forming the groove part deeply, in the part where the outer peripheral wall and the ceiling wall intersect, a thin part formed thinner than the thickness of the part of the other ceiling wall is formed,
A cap characterized in that a plurality of reinforcing ribs are formed so as to connect the outer peripheral wall, the inner peripheral wall and the top wall. The cap according to claim 1, wherein a needle body is formed on an upper surface of the top wall.

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