JPS6215146Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Purpose of invention) The present invention relates to an improvement of a metal pressure cap.

As a metal pressure-resistant cap, one shown in FIG. 1 is known.

In FIG. 1, A is a metal pressure-resistant cap that is screwed onto the bottle mouth C, and B is a cylindrical portion that is coated and molded on the inner surface of the cap, and that includes a disk portion 21 and a cylindrical portion that hangs down from the periphery of the disk portion. 22, when the cap A is screwed onto the bottle mouth and tightened, the peripheral portion 2 of the disk portion 21 of the packing member B is formed between the cap A and the top surface 15 of the bottle mouth C.
1a, an upper cylindrical wall 2 that hangs down from the periphery of the ceiling wall and clamps and presses the cylindrical portion 22 of the packing member B between it and the upper outer circumferential surface 16 of the bottle mouth C; It consists of a main cylindrical wall 3 which is integral with the upper cylindrical wall 2 and has a threaded part 4 having a larger diameter than the upper cylindrical wall 2 and which is threadedly engaged with the threaded part 17 of the bottle mouth.

When this cap is screwed onto the bottle spout having the above-mentioned upper outer circumferential surface, threaded portion, etc., the peripheral portion 21a of the disc portion 21 of the packing member B is attached to the top surface 15 of the bottle spout.
The peripheral part 1 of the ceiling wall 1 facing the top surface 15 of this
0, and the cylindrical portion 22 of the packing member B is clamped and pressed between the upper cylindrical wall 2 of the cap and the upper outer peripheral surface 16 of the bottle mouth, thereby sealing the bottle mouth. Therefore, when the ceiling wall 1 of the cap A bulges into a shallow dome shape due to the pressure inside the bottle, the seal between the top surface 15 of the bottle mouth and the peripheral portion 21a of the disk portion 21 of the packing member B loosens. However, the upper cylindrical wall 2 of the cap is displaced toward the bottle mouth by this amount of slack, and the seal between the upper outer circumferential surface 16 of the bottle mouth and the cylindrical portion 22 of the packing member B is reinforced, and the bottle is closed. The seal is maintained.

However, this displacement of the upper cylindrical wall 2 toward the bottle opening occurs when, for example, the temperature of the liquid in the bottle rises, the pressure inside the bottle further increases, and the dome shape of the ceiling wall 1 of the cap further expands. Furthermore, when the peripheral part of the ceiling wall 1 of the cap or its vicinity is hit, the cylindrical part 22 of the packing member B may lose the elasticity necessary for packing, and the ceiling wall 1 of the cap may be damaged. If it is deformed into an elliptical shape or partially displaced, the gas inside the bottle will leak and the pressure inside the bottle will decrease.

An object of the present invention is to provide a metal pressure-resistant cap that is configured to reduce the incidence of bottles in which the pressure inside the bottle is reduced.

(Structure of the invention) In order to achieve the above-mentioned object, this invention, in the above-mentioned conventional metal pressure-resistant cap, has a fixed height in the diametrical direction of the cap over the entire peripheral part of the ceiling wall facing the top surface of the bottle mouth. Convex shapes extending at a constant interval were provided close to each other.

Since the bottle equipped with the cap of the present invention has the above-mentioned structure, the entire ceiling wall deforms and bulges out, whereas a bottle equipped with a conventional flat cap that does not have a convex shape around the ceiling wall will deform and bulge. The upper cylindrical wall of the bottle is displaced in the radial direction of the bottle, and the cap receives most of the pressure in the bottle at the upper cylindrical wall as a radial force of the cap. parts are not deformed, so that the upper cylindrical wall of the cap is not displaced in the radial direction of the bottle, so that the cap distributes the pressure inside the bottle as a force in the radial direction of the bottle and a force in the direction of the bottle axis. Get support. In addition, the resistance against blows applied to the peripheral portion of the ceiling wall or its vicinity is improved, and the said portion is not deformed, or even if it is deformed, the deformation is smaller than that of conventional caps. These improve the ability to maintain a seal between the top surface of the bottle mouth and the outer circumferential surface of the upper part of the bottle mouth and the packing member, thereby reducing the incidence of bottles with reduced internal pressure.

A specific example of the present invention will be explained with reference to FIG. 2 (perspective view).

Cap E shown in FIG. 2 has the same shape as the cap shown in FIG. 1, except for the structure of its ceiling wall. The cap E of the present invention is provided with convex shapes 11 extending at the same height in the diametrical direction on the entire peripheral portion 10 of the ceiling wall 1 facing the top surface 15 of the bottle opening shown in FIG. .

In this specific example, the cap is the diameter D of the ceiling wall 1.
It is made of aluminum with a thickness of 0.24 mm and the convex part has an inner diameter d of 31 mm (equal to the inner diameter of the bottle mouth), a convex height h (Fig. 3) of 0.2 mm, and a convex pitch. P was 2 mm, and the diametrical length of the convex cap (slightly longer than the diametrical width of the top surface of the bottle mouth) was 4 mm.

The thickness of the packing member was 1.5 mm.

Bottles fitted with the cap of this specific example have a lower incidence of bottles with reduced internal pressure than bottles fitted with conventional caps whose entire ceiling wall is flat.
The degree of pressure drop in the bottle was small and was such a drop that it did not pose a substantial problem.

(Effects of the invention) The cap of the present invention is a cap in which a packing member is interposed between the top surface of the bottle mouth and the outer peripheral surface of the upper part to achieve a seal. Since the convex shapes extending from each other are placed close to each other at regular intervals, the pressure inside the bottle causes displacement of the cap only in the center of the ceiling wall and not in other parts. This improves the ability to maintain a tight seal between the caps, and improves the resistance to blows applied near the periphery of the ceiling wall.There is no deformation due to blows, etc., or even if it does deform, it is smaller than the deformation of conventional caps. ,
The ability to maintain a tight seal between the top surface of the bottle spout, the upper outer peripheral surface, and the packing member is improved. Further, by improving the ability to maintain the seal on the top surface and the outer circumferential surface, there is an effect that the amount of decrease in the pressure inside the bottle is reduced, and the degree of decrease in the pressure inside the bottle is small.

Furthermore, since the convex shape is provided in the peripheral portion of the ceiling wall, there is an advantage that the fabrication of the processed parts and the molding of the convex shape can be done simultaneously with the molding of the cap, making it easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional pressure-resistant crown-type cap screwed onto the bottle mouth, Fig. 2 is a perspective view of an example of the cap of the present invention, and Fig. 3 is an explanation showing the pitch and height of the convex shape. figure. E... Cap, 1... Ceiling wall, 2... Upper cylindrical wall, 3... Main cylindrical wall, 4... Screw thread, 10...
Peripheral part of the ceiling wall, 11... Convex shape of the peripheral part 10 of the ceiling wall 1, B... Packing member, C... Bottle mouth, 15... Top surface of the bottle mouth, 16... Upper outer peripheral surface of the bottle mouth , 21... Disk portion of packing member, 21
a... Peripheral portion of the disc portion, 22... Cylindrical portion of the packing member.

Claims (1)

[Scope of Claim for Utility Model Registration] A ceiling wall, an upper cylindrical wall that hangs down from the periphery of the ceiling wall, and a main cylinder that is integral with the upper cylindrical wall, has a larger diameter than the upper cylindrical wall, and has a threaded portion. and a packing member coated and molded on the inner surface so as to cover the ceiling wall and the upper cylindrical wall, and the threaded part is screwed into the threaded part of the bottle mouth and tightened, and the packing member is A peripheral portion of the disc portion is sandwiched and pressed between the ceiling wall and the top surface of the bottle mouth, and a cylindrical portion of the packing member is sandwiched and pressed between the upper cylindrical wall and the upper outer peripheral surface of the bottle mouth. In a pressure-resistant metallic cap that forms a seal at the mouth of a bottle, convex shapes extending at a constant height in the diametrical direction of the cap are placed close together at regular intervals around the entire peripheral part of the ceiling wall facing the top surface of the bottle mouth. A metal pressure-resistant cap is provided.