JPS6333816Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a disc-shaped tight-fitting plug made of flexible plastic and having a cylindrical peripheral wall.

(Prior Art) As shown in FIG. 4, a conventionally known tight inner stopper A of this type has a disc shape with a cylindrical peripheral wall 1 having a flange at the upper end. It is designed to be fitted into a fitting surface A provided on the holder.

(Problem to be solved by the invention) In manufacturing the tightly closed stopper A and the container C,
It is sufficient to control the tolerances to the extent that the tight inner stopper A fits exactly into the container C, but in reality, it is difficult to control the tolerances to the extent that they fit exactly.

For this reason, the conventional tight-fitting inner stopper A had a drawback in that when it was fitted into the container portion C, the cylindrical peripheral wall 1 of the tight-tight inner stopper A did not come into close contact with the fitting surface A of the container C.

The purpose of the present invention is to provide a remedy for these drawbacks, and to provide a structure of a tight inner stopper that has a simple structure and allows the diameter of the peripheral wall of the tight inner stopper to be increased.

(Means for Solving the Problems) A feature of the present invention is that the bottom of the tight-fitting plug is curved upward to form a gentle spherical surface with a predetermined radius of curvature, and the lower end of the peripheral wall and the bottom A plurality of locking protrusions extending toward the center of the peripheral wall are provided on the back side of the peripheral wall, and when the curvature of the bottom part is reversed, the radius of curvature is larger when the bottom is curved downward than when it is curved upward due to the locking protrusions. It's what I wanted it to be.

(Example) To explain this with the cross-sectional view in FIG. 1 and the bottom view in FIG. It is becoming. The peripheral wall 1 has a flange 4 at its upper end.
have. The peripheral wall 1 has a cylindrical surface shape,
The bottom portion 2 is curved upward so that its center forms a gentle spherical surface with a predetermined radius of curvature. Further, at the lower end of the peripheral wall 1 and on the back side of the bottom part 2, a plurality of locking protrusions 3 extending toward the center of the peripheral wall 1 are provided on the bottom part 2.
It is provided with a gap. A grip portion 5 is provided protruding from the center of the bottom portion 2.

The case in which a flexible plastic tight stopper shaped as described above is fitted into and removed from the opening of a container will be described with reference to FIG. 3 as well.

In order to fit the tight inner stopper A into the fitting surface A of the container C, the tight inner stopper A is fitted with the bottom portion 2 shown in FIG. 1 curved upward. In this state, the peripheral wall 1 of the tight inner stopper A receives a force from the bottom portion 2 in the direction of reducing its diameter, and the slight reduction in diameter facilitates fitting.

When the tight fitting of the inner stopper A is completed, the bottom part 2 is pressed with a finger to reverse the curvature of the bottom part 2. In this state, the radius of curvature is larger than in the state shown in FIG. 1, so the peripheral wall 1 receives a force from the bottom 2 in the direction of expanding the diameter. Therefore, the circumferential wall 1 expands in diameter and tightly fits into the fitting surface A of the container C.

Next, when inserting or removing the tight inner stopper A, pull up the grip portion 5 formed on the bottom portion 2 with your fingers to reverse the curve of the bottom portion 2 upward as shown in FIG. Then, the bottom portion 2 applies a force in the direction of reducing the diameter of the peripheral wall 1, so that the diameter is slightly reduced and the fitting and removal are easily performed.

(Effects of the invention) According to the invention described above, the following effects are achieved.

According to the present invention, the diameter of the peripheral wall can be increased with a simple configuration, so that the tightness of the tight inner stopper can be improved at low cost.

Further, when fitting and disengaging the tight inner stopper, the diameter of the peripheral wall can be easily reduced, so that fitting and disengaging can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the tight inner stopper with a locking protrusion according to the present invention, FIG. 2 is a bottom view of the tight inner stopper of FIG. 1, and FIG. 3 is a fitting of the tight inner stopper of the present invention. FIG. 4 is a vertical cross-sectional view showing a conventional inner stopper. A: Tight inner stopper, C: Container, 1: Peripheral wall, 2: Bottom, 3: Locking protrusion, 4: Flange, 5: Grip, A: Fitting surface.

Claims (1)

[Scope of utility model registration request] In a disc-shaped tight inner stopper made of flexible plastic and equipped with a cylindrical peripheral wall having a flange at the upper end, the bottom of the tight inner stopper is bent upward so as to form a gentle spherical surface with a predetermined radius of curvature. a plurality of locking protrusions extending toward the center of the peripheral wall are provided at the lower end of the peripheral wall and the back side of the bottom with a gap from the bottom, and when the curve of the bottom is reversed, the locking protrusions Therefore, the tight inner stopper with a locking projection is characterized in that the radius of curvature is larger when it is curved downward than when it is curved upward.