JPH0531078Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a bottle cap made entirely of synthetic resin and to be attached to the mouth of a narrow-mouth or wide-mouth bottle made of glass or plastic. It is something.

(Prior Art) Among conventional bottle caps, caps having a liner or packing on the inside are widely used because they have a high sealing performance against the bottle mouth. In addition, with regard to caps without liners or packing on the inside, manufacturing costs and workability are considered important, and many inventions and ideas have been proposed to put these into practice.

For example, there is a cap shown in Japanese Patent Application Laid-Open No. 55-97352. This will be explained based on FIG. Cap 2 screwed and fixed to the mouth of bottle 21
2 has a threaded portion 23 on the inside thereof for engaging with the bottle mouth.
The annular wall 24 hanging down from the top back surface of the cap has small circumferential protrusions 25 on its outer peripheral wall, and a circumferential protrusion 27 projecting from the top back surface of the cap.
It is equipped with

When fastening the cap 22 to the mouth of the bottle 21, the circumferential protrusion 27 first comes into contact with the top surface of the bottle mouth, and then the cap 22 is further rotated to complete the threaded connection, and at the same time the small protrusion 25 of the annular wall 24 is attached to the top of the bottle mouth. Stepped portion 2 provided on the inner wall of
6.

A cap with a similar structure is also shown in Japanese Patent Laid-Open No. 194938/1983.

(Problem to be solved by the invention) In the conventional cap described above, the small protrusions 25 of the annular wall 24 are solid (solid), so the small protrusions 25 of the annular wall 24 that are in contact with the inner wall of the bottle opening are solid. 25 can be strengthened and the sealing performance can be improved, but at the same time, the opening torque of the cap can be increased. Depending on the contents, it is better to seal well and open the cap with a larger torque, but for many items used at home, it is better to seal well and not require a large opening torque, considering the hand strength of elderly women. is desirable.

Therefore, the present invention provides a cap that is constructed so that the opening torque does not increase even if the sealing performance is improved, and that the cap is easily covered with the bottle opening.

(Means for Solving the Problems) In order to achieve the above object, the present invention has an annular sealing wall that is entirely molded from synthetic resin and that hangs down from at least the lower surface of the top of the cap and abuts along the inner wall of the bottle mouth. , a screw-in cap for a bottle comprising an annular abutting part located outside the sealing wall, hanging down from the lower surface of the top of the cap, and abutting the upper surface of the bottle mouth, wherein the lower edge of the annular sealing wall is on its outer surface. This bottle cap is bent to the side and upward, and the bent portion is provided in direct contact with the inner wall of the bottle mouth.

(Function) Since the present invention has the above-mentioned configuration, when the cap is screwed into the bottle mouth and capped, the lower edge of the seal wall is bent outward and upward, so this part is elastic. It fits smoothly into the inner wall of the bottle mouth, and after insertion, the elasticity of the seal wall itself and the bending elasticity of its lower edge improve the sealing performance with the inner wall of the bottle mouth without increasing the opening torque. be able to.

(Embodiment) Figures 1 to 4 show a first embodiment of the present invention, which is a bottle cap 1 made entirely of synthetic resin.
The inner circumferential wall of the cap 1 is provided with a threaded portion 3 that is screwed into a threaded portion of the bottle mouth 2. On the lower surface of the top of the cap 1, a first annular seal wall 4 abuts along the inner wall 2a of the bottle spout 2, and a second annular seal wall 5 abuts along the outer wall 2b of the bottle spout 2. , first and second
An annular abutting part 6, which is located between the annular seals 4 and 5 and which the top 2c of the bottle mouth comes into contact with, is integrally provided. The lower end of the first annular sealing wall 4 is provided with a radially outwardly directed annular tongue 4a. It is desirable that the tip of the tongue portion 4a has a substantially wedge-shaped cross-sectional shape. Before the tongue portion 4a is fitted with the bottle spout 2, it is in a state as shown in FIG. is pressed against the inner wall 2a of. The second annular seal wall 5 includes a first
The annular seal wall 4 has no tongue portion 4a and has smooth inner and outer surfaces. The contact portion 6 provided on the lower surface of the cap 1 between the first and second annular seal walls 4 and 5 has a substantially triangular cross-sectional shape, but may also be trapezoidal, square, etc. It is.

In this embodiment, the bottle mouth 2 is connected to the tongue 4 of the sealing wall 4.
a, the contact portion 6, and the inner wall surface of the seal wall 5 to maintain a liquid-tight state.

The cap of this embodiment can be die-cut without leaving any deformation on the tongue portion 4a of the sealing wall 4 during manufacturing.

Next, FIG. 5 shows a second embodiment of the present invention.
This embodiment differs from the previous embodiment in the structure of the second annular sealing wall 5. The lower end of the second sealing wall 5 is provided with an annular tongue 5a pointing radially inward. The first and second seal walls 4 and 5 have opposing cross-sectional shapes. Therefore,
When the cap 1 is fitted into the bottle spout 2, the tongue portion 4a of the seal wall 4 and the tongue portion 5a of the seal wall 5 are folded upward as shown by the dotted lines and touch the inner and outer wall surfaces of the bottle spout 2. The contact portion 6 cooperates with the pressure contact of the contact portion 6 to perform a sealing action.

During manufacturing, the tongue portions 4a, 5a of the seal walls 4, 5
can be molded without leaving any deformation during die cutting.

Further, a third embodiment of the present invention will be explained with reference to FIGS. 6 and 7. This embodiment is a modification of the embodiment shown in FIG. 1, in particular, the cross-sectional shape of the tongue 4a' of the first sealing wall 4 is changed. That is, a downwardly directed rib 4b' is provided at the outer end of the tongue portion 4a'. With the first seal wall 4 configured in this way, as shown in FIG.
When the bottle is attached to the bottle, the tongue 4a' and the rib 4b' are folded upward and form two contact points with the inner wall surface of the bottle mouth.

(Effects) Since the present invention has the above-mentioned configuration, when the cap is screwed into the bottle mouth and capped, the lower edge of the seal wall is bent outward and upward, so this part is elastic. It can be smoothly inserted into the inner wall of the bottle mouth. In addition, after fitting, the folded part is pressed against the inner wall of the bottle mouth by the elasticity of the seal wall itself and the bending elasticity of its lower edge, so the sealing performance can be improved in cooperation with the contact part. Since the torque is not increased, the cap can be opened easily.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of main parts showing the relationship between the bottle opening and the bottle mouth of the first embodiment of the invention, Fig. 2 is a bottom view of the cap in the first embodiment of the invention, and Fig. 3 is the second embodiment of the cap.
FIG. 4 is an enlarged longitudinal sectional view of the main part of the present invention; FIG. 5 is an enlarged longitudinal sectional view of the main part of the second embodiment of the invention; FIG. The third embodiment of the invention is an enlarged vertical cross-sectional view of the main part, FIG. 7 is a diagram showing the operating state of the tongue or lower end shown in FIG. 6, and FIG. 8 is a diagram showing the relationship between the conventional cap and bottle mouth. FIG. 1... Cap, 2... Bottle mouth, 4... (1st
) Seal wall, 6...Abutment part.

Claims (1)

[Claims for Utility Model Registration] The whole is molded from synthetic resin, and includes at least an annular sealing wall that hangs down from the lower surface of the top of the cap and abuts along the inner wall of the mouth of the bottle, and a top of the cap that is located outside of the sealing wall. In a screw-on bottle cap comprising an annular abutting part that hangs down from the lower surface and comes into contact with the upper surface of the bottle mouth, the lower edge of the annular seal wall is bent toward the outer surface and upward, and the bent part is bent upward. A bottle cap characterized by being provided in direct contact with the inner wall of the bottle mouth.