JPH068030Y2 - Synthetic resin lid - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a synthetic resin lid such as a bottle container, and more particularly to a lid with improved sealing between the container mouth and the lid. is there.

[Prior Art] As a lid made of synthetic resin for sealing the mouth of a container such as a bottle,
As shown in FIG. 3, it has a side wall portion 15 which is cylindrical and has therein a female screw portion 17 which is screwed into a male screw portion formed on the outer periphery of the container mouth. There is a disk-shaped top plate portion 11 in the horizontal direction from the upper end of the side wall portion 15, and a lid 10 having a liner 19 formed and attached to the peripheral portion of the back surface of the top plate portion 11 is often used. Was made of a synthetic resin softer than the lid body, and was pressed against the upper end of the container mouth to enhance the sealing property between the container mouth and the lid 10.

In recent years, linerless caps have been called
As shown in FIG. 4, the side wall portion 15 is formed without adhering and forming a synthetic resin different from that of the lid body on the back surface of the lid top plate portion 11.
When a thick annular tongue piece 41 is formed integrally with the side wall portion 15 in the horizontal direction from near the inner upper end of the container, and the lid body 10 is covered with the container mouth portion 31, as shown in FIG. Attach the tip of the tongue piece 41 to the top plate.
Thick tongue piece 41 is deformed so as to contact the back surface of 11 and the container mouth
A thick-walled tongue piece 41 is pressed against the outer side of the upper end of 31 for sealing (for example, Japanese Patent Laid-Open No. 47-46.277), and as shown in FIG. When an annular tongue piece 43 having an upper surface is formed integrally with the side wall portion 15 and the lid body 10 is covered with the container mouth portion 31, as shown in FIG. The tongue piece 43 is deformed so as to come into contact with the inside of the portion 15, and the tongue piece 43 is pressed against the upper end outside of the container mouth portion 31 for sealing (for example, Japanese Utility Model Publication No. 60-27.044), As shown in FIG. 8, an annular tongue piece 45 is provided from the inner upper end of the side wall portion 15 toward the inner lower side, and an annular support ring 47 is provided near the back surface peripheral edge portion of the top plate portion 11 to cover the lid body 10. When the container mouth 31 is covered with the container mouth 31, the tongue 45 is deformed so that the upper surface of the tongue 45 contacts the support ring 47, as shown in FIG. The tongue piece 45 is pressed and tightly packed. What is sealed (for example, Japanese Patent Laid-Open No. 54-79.788), and as shown in FIG. 10, when the lid 10 is covered with the container mouth 31, the inside and outside of the container mouth 31, and further the container mouth There is one in which the tongue pieces 51, 52, 53 are brought into close contact with the upper end surface 33 of the portion 31 at three positions, etc. to perform sealing (for example, JP-A-52-96.184).

[Problems to be Solved by the Invention] Although a lid body provided with a liner on the back surface of the lid top plate can perform relatively reliable sealing, a step of attaching the liner after molding the lid body is required. There is a drawback that it takes time to manufacture and it is difficult to reduce the manufacturing cost.

In addition, in a linerless cap that does not use a liner, a lid body in which the tongue pieces are tightly sealed at three positions, such as the inner side, the outer side, and the upper end surface of the upper end of the container mouth, has an extremely complicated shape and is difficult to form. It was difficult. Further, it cannot be said that a good sealing can be maintained in the lid body in which the tongue piece is pressed against the outer periphery or the upper end surface of the container mouth.

[Means for Solving the Problems] The present invention has a lid body made of synthetic resin, which has a side wall portion hanging downward from a peripheral edge of a top plate portion, and a back surface of the top plate portion is pressed against an upper end of a container mouth portion. In the above, on the back surface of the top plate portion, an annular protrusion is formed that is in contact with the inner peripheral edge of the upper end of the container mouth portion, and an annular support portion that protrudes inward is formed near the upper end inside the side wall portion. Also forms an annular tongue piece from the lower position toward the center and obliquely downward direction of the lid body, and the annular tongue piece is thin and gives flexibility, and when the lid body is covered with the container mouth, The back surface of the plate portion is pressed against the upper end surface of the container mouth portion, and the annular projection is pressed against the inside of the upper end surface of the container mouth portion, and the tip of the annular tongue piece is pushed up by the upper end portion of the container mouth portion and the annular support portion. The annular tongue can be sandwiched between the outside of the container opening and the outside.

[Operation] When the lid according to the present invention is covered on the container mouth, the back surface of the lid top plate is pressed against the upper end of the container mouth, and the annular tongue is bent and deformed upward to cause the container mouth to move. Close to the outside, the container can be sealed.

The annular support portion provided inside the lid side wall portion ensures that the annular tongue piece is brought into close contact with the outside of the container mouth portion, and the annular protrusion formed on the back surface of the lid top plate portion is Abutting on the inside of the upper end of the container mouth, further optimizing the positions of the lid and the container mouth to ensure the sealing by the annular tongue, and the annular protrusion itself is also pressed against the inside of the upper end of the container mouth. It is to be sealed.

[Embodiment] As shown in FIG. 1, the embodiment of the lid according to the present invention has a cylindrical side wall portion 15 below the peripheral edge of the disk-shaped lid top plate portion 11, and the side wall portion 15 is provided. Inside is a synthetic resin lid 10 in which a female screw portion 17 is formed, and a cross section of the lid top plate 11 near the peripheral edge of the back surface is half-shaped so as to contact the inside of the upper end of the container mouth. A side wall 15 is formed so that a circular annular protrusion 21 is formed and an annular support 29 having a semicircular cross section near the inner upper end of the lid side wall 15 does not come into contact with the upper outer side of the container mouth 31. An annular tongue piece 25 that projects inward from the inner side upper end of the side wall portion 15 below the annular support portion 29 toward the center direction of the lid body 10 and is inclined downward. The annular tongue piece 25 is made thin and is formed by a plate-like body which is annularly continuous along the inside of the side wall portion 15, and the annular tongue piece 25 is attached to the side wall portion 15. Length from the base portion is a location to the edge 27 which is the center side end of the lid body 10 near the base of the annular tongue 25 to the length of up to the inner upper end of the side wall portion 15, the annular tongue Te than
The diameter of the circle formed by the tip 27 of the annular tongue piece 25 is made smaller than the outer diameter of the container mouth portion 31 while being made longer than the distance from the base portion of 25 to the annular support portion 29.

Since the lid body 10 according to the present embodiment has the above-described structure, when the lid body 10 is covered with the container mouth portion 31 by screwing the female screw portion 17 into the male screw portion 37, an annular tongue is formed. Piece 25 tip 27
Comes into contact with the upper end surface 33 of the container mouth portion 31, and as the lid 10 is screwed into the container mouth portion 31, the annular tongue piece 25 is deformed so that the tip 27 is pushed up, and as shown in FIG. When the upper end of the portion 31 is pressed against the rear surface of the lid top plate portion 11, the annular tongue piece 25 is placed outside the container mouth portion 31 so as to be sandwiched between the annular support portion 29 and the outer periphery of the container mouth portion 31. A part of the annular tongue piece 25 is brought into close contact.

Further, when the upper end of the container mouth portion 31 is pressed against the back surface of the lid top plate portion 11, the annular protrusion 21 provided on the back surface of the top plate portion 11 causes the container mouth portion to
Since it is pressed against the inside of the upper end of the lid 31, the central axis of the lid 10 and the central axis of the container mouth 31 are aligned to position the lid 10 at an appropriate position with respect to the container mouth 31, and Not only the upper end surface 33 but also the upper end inner ring of the container mouth portion 31 forms a narrow linear pressure contact portion.

In the present embodiment, as described above, the upper end surface 33 of the container mouth portion 31 is pressed against the back surface of the lid top plate portion 11 so that the back surface of the lid top plate portion 11 and the container mouth upper end surface 33 are pressed together. In addition to forming the portion, a linear pressure contact portion along the inner upper end of the container mouth portion 31 is formed by the annular projection 21 formed on the back surface of the lid top plate portion 11, and further on the outer periphery of the container mouth portion 31. Since the intimate part is formed by the annular tongue 25,
A lid 10 capable of reliably sealing the container, and
An annular protrusion 21 is formed on the back surface of the top plate portion 11, an annular support portion 29 protruding inward of the side wall portion 15 and an inclined flat plate-shaped annular tongue piece.
Therefore, the lid body 10 is made of synthetic resin and has a relatively simple shape and is easy to mold and manufacture.

And, as described above, a reliable seal can be obtained by sealing at the inner side of the container mouth 31, the upper end surface 33 and the outer side of the upper end, and the center of the lid 10 can be secured by the annular protrusion 21. Aligned with the center of the container mouth portion 31, the gap between the inner surface of the side wall portion 15 and the outer periphery of the container mouth portion 31 is adjusted to be substantially uniform over the entire circumference of the container mouth portion 31, and the annular tongue piece 25 is evenly arranged in the container. A tighter seal is achieved by making close contact with the outer periphery of the mouth portion 31, and a good sealing is achieved without separately forming a liner 19 made of a soft synthetic resin suitable for packing on the back surface of the lid top plate portion 11. Therefore, the step of forming a liner can be omitted, and mass production can be performed easily and inexpensively.

Incidentally, in the above embodiment, the cross-sectional shapes of the annular support portion 29 and the annular protrusion 21 are semicircular, but the annular support portion 29 and the annular protrusion 21 are
The cross-sectional shape of can also be trapezoidal.

[Effect of the Invention] The synthetic resin lid according to the present invention has an annular protrusion on the back surface of the top plate and an annular support and an annular tongue inside the side wall to form an upper portion of the container mouth. Not only the end face but also the annular protrusion, the pressure contact portion is formed not only on the inside of the upper end of the container mouth, but also the annular tongue forms a close contact portion on the outer circumference of the container mouth, so that the container mouth is securely sealed. You can

Therefore, it is possible to produce a lid having good sealing property only with a synthetic resin suitable for molding a lid having shape retention property, and an additional step of a liner using a soft synthetic resin is unnecessary, And, a simple shape protrusion, an annular support portion,
Further, since it is only integrally molded so that the annular tongue piece is additionally formed, it is a synthetic resin lid body that can be easily molded and manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a synthetic resin lid body according to the present invention, FIG. 2 is a half sectional view showing a state in which the lid body is covered with a container mouth, and FIG. 3 is a conventional sectional view. Sectional views showing a lid made of synthetic resin with a liner, FIGS. 4 and 5 are sectional views showing a lid body called a conventional linerless cap and a sectional view showing a state in which a container mouth is covered, Figures 6, 8 and 1
FIG. 0 is a cross-sectional view showing another conventional linerless cap, FIG. 7 shows the cap shown in FIG. 6 and FIG. 9 shows the cap shown in FIG. FIG. 10 = lid, 11 = lid top plate, 15 = lid side wall, 17 = female screw, 19 = liner, 21 = annular protrusion, 25 = annular tongue, 29
= Annular support portion, 31 = container mouth portion, 33 = container mouth upper end surface, 41
= Thick tongue, 43,45 = Tongue, 47 = Support ring, 51,52,53
= Tongue piece.

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin lid having a side wall portion extending downward from a peripheral edge of the top plate portion, the back surface of the top plate portion being in pressure contact with the upper end of the container mouth, wherein the back surface of the top plate portion is It has an annular protrusion that is concentric with the side wall portion and contacts the inner peripheral edge of the upper end of the container mouth portion, and has an annular support portion that protrudes inward near the upper end inside the side wall portion. Also has an annular tongue piece that is directed obliquely downward from the lower position toward the center of the lid,
The annular tongue has flexibility, and when the lid is covered with the container mouth, the back surface of the top plate is pressed against the upper end surface of the container mouth and the annular protrusion is A synthetic method characterized in that it is pressed against the inside of the upper end, and the annular tongue is clamped between the annular support and the outer periphery of the container mouth so that the annular tongue is pressed against the outer periphery of the container mouth. Resin lid.