JPH08104326A - Easily openable structure by tab for can - Google Patents

Abstract

PURPOSE: To provide an easily openable structure wherein a tab can be opened by a weak force by reducing a pull-up force for the tab for opening. CONSTITUTION: A rivet 4 of a tab 3 is slightly shifted from the central part of a can diameter, and a ratio for the lengths of the rivet 4, force end 3a and working end 3b is made approx. 3:1 or higher. By doing so, the pull-up force of the force end 3a can be reduced by 50% or more compared to a conventional example, and for this reason, an cut edge 5 for opening of a can can be easily opened by a weak force.

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple opening structure with a can tab for attaching to the top of a can product such as can beer, can coffee or can juice to open the can.

As this type of can tab, for example, one having a structure disclosed in Japanese Patent Laid-Open No. 4-201852 is known. The tab according to this conventional example has been devised in various ways for facilitating the pulling, but the tab attachment position, that is, the rivet position is still provided at the center of the can diameter.

As described above, the mounting position of the rivet serving as the fulcrum of the tab is at the center of the can diameter, and in the application of the lever with the rivet as the fulcrum, the cut portion pressed and opened by the working end of the tab is the can diameter. It is elongated and has a tongue shape toward the center.

Accordingly, the ratio of the length between the force end and the fulcrum and the length between the fulcrum and the working end of the tab is approximately 2: 1.

[0005]

Since the rivet of the tab in the above-mentioned conventional example is located at the center of the can diameter, the ratio of the length between the force end and the fulcrum and the length between the fulcrum and the working end is approximately 2: Due to the establishment of the configuration of 1
In order to tear and open the cut portion to be the opening, the force for pulling up the force end of the tab needs to be 1/2 or more of the force for tearing the opening.

The strength of the cut portion cannot be made weaker than the existing strength in consideration of safety in transportation or other handling. However, this kind of can product is used by men and women of all ages, and it is strongly demanded that the can product be opened with a weaker force while maintaining safety in handling.

Therefore, the conventional example has a problem that must be solved to make it possible to easily open with a weaker force.

[0008]

As a concrete means for solving the above-mentioned problems of the conventional example, the present invention is to tear a cut portion for opening which is attached to the top of a can through a rivet and has a predetermined shape. A tab that acts on the rivet, the rivet of the tab being displaced from the center of the can diameter and provided near the cut end, and the ratio of the length of the rivet to the force end side and the length of the rivet to the action end side. The present invention provides a simple opening structure with a tab for a can, characterized in that it is configured to have a ratio of about 3: 1 or more, and the cut portion for opening of the predetermined shape is formed into a substantially circular shape or an elliptical shape along the circumferential direction of the can. It also includes what you have done.

[0009]

In the present invention, the rivet of the tab is displaced from the center of the can diameter, and the length ratio of the rivet to the force end and the action end is set to about 3: 1 or more, whereby the pulling force of the force end is increased. It can be reduced by 50% or more as compared with the conventional example, and thereby the opening cut portion of the can can be easily opened.

[0010]

EXAMPLES Next, the present invention will be explained in more detail with reference to the illustrated examples. In the first example shown in FIGS.
Reference numeral 1 denotes a can of beer or canned coffee, and a tab 3 for opening is attached to a lid on the upper part of the can, that is, a top 2 via a rivet 4.

A cut portion 5 for opening is provided on the top portion 2 of the can, and the cut portion 5 is, for example, substantially circular and is provided in an engraved state along a predetermined opening. The cut portion 5 has a substantially circular shape, but when it is desired to make the opening large, the cut portion 5 can be formed so as to be slightly inflated as shown by an imaginary line in the circumferential direction of the can 1.

In the present invention, when the tab 3 is attached, the rivet 4 is displaced from the central portion 1a of the can 1,
The feature is that it is provided near the cut portion 5. And
The shape of the cut portion 5 should not be formed to be long in the radial direction of the can 1, but should be formed to be substantially circular and preferably to have a bulge along the circumferential direction of the can 1.

As described above, the position of the rivet 4 is set to the central portion 1.
By displacing from a and forming the cut portion 5 into a substantially circular shape, the ratio of the force end 3a to the action end 3b in the tab 3,
That is, the ratio of the length L from the rivet 4 to the force end 3a and the length l from the rivet 4 to the working end 3b, that is, L: l≈
It can be 3: 1 or more, preferably about 4: 1.

In the ratio in this case, it is clear that the pulling force is reduced even if it exceeds the conventional 2: 1 and is, for example, about 2.5: 1, and up to this range is about 3: 1. Should be understood to fall within the scope of.

Further, the position of the rivet 4 is set to the central portion 1 of the can diameter.
Since the tabs 3 can be attached while being displaced from each other, the length and width of the tab 3 can be arbitrarily selected, the shape of the cut portion 5 and the degree of freedom in design are increased, and the opening is facilitated.

It should be noted that the top portion 2 may be provided with a concave portion 2a so that a finger can be easily put on the tab 3 to cause the force end 3a of the tab 3. The tab 3 is provided with a finger-holding window 3c as in the conventional example, and a punching window 3d located in a part of the periphery of the rivet 4 to quickly apply the lever. The punching window 3d allows the force end 3a
The rivet 4 as a fulcrum when the tab is pulled up.
This makes it easier to exercise the leverage and requires less lifting force.

With respect to the simple opening structure of the can tab thus constructed, the principle of opening will be described with reference to FIG. 3. The tab 3 is attached by the rivet 4 serving as a fulcrum, and the rivet 4 and the force end 3a. When the ratio of the lengths of the rivet 4 and the working end 3b, that is, the ratio of L: l is set to about 4: 1, compared with the conventional L ': l ratio of 2: 1. It is possible to perform the opening by tearing the cut portion 5 with a pulling force that is physically approximately half or less.

At the same time, in the opening operation, the working end 3 is still under the condition that the force end 3a side is slightly pulled up (the position indicated by the dotted line in the figure).
When b is not in the state of substantially performing the opening action, the pull-up interval of the force end 3a is twice as large as the pull-up interval in the conventional case of 2: 1, whereby the force end 3a side. This makes it easier to put your finger on, and the subsequent opening operation can be performed more easily.

Particularly for the elderly, children and women, the fact that the initial pull-up interval is large makes it easy for the fingers to enter, and the force of less than half of the conventional force is sufficient, which makes opening work impossible. It can be done without.

In the second embodiment shown in FIG. 4, when the cut portion 5 for opening has a substantially elliptical shape, the width of the tab 3 is slightly widened so that the cut portion 5 can be opened efficiently. It was done. Even in this case, the length ratio of the rivet 4 serving as the fulcrum to the force end 3a and the action end 3b is the same as that in the above-described embodiment.

In any case, in the present invention, the rivet 4 serving as a fulcrum is displaced from the center of the can diameter to attach the tab 3, and the cut portion 5 for opening is made substantially circular or elliptical. As a result, the ratio of the fulcrum of the tab to the force end and the action end is set to about 3: 1 or more, and the force for opening is reduced to less than half that of the conventional one, thereby facilitating the opening work.

[0022]

As described above, the simple opening structure using the tab for a can according to the present invention is attached to the top of the can via a rivet and acts so as to tear the cut portion for opening formed in a predetermined shape. The tab is provided with a rivet displaced from the center of the can diameter toward the cut end, and the ratio of the length of the rivet to the force end side and the length of the rivet to the working end side is approximately With the structure of 3: 1 or more, the pulling force applied to the force end side is significantly reduced compared to the conventional 2: 1 ratio, and the excellent effect that opening work can be easily performed with weak force is achieved. Play.

Further, since the cut portion for opening having the predetermined shape is formed into a substantially circular shape or an elliptical shape along the circumferential direction of the can, not only a sufficient opening area can be secured, but also the mounting position of the rivet is set to the can diameter. It can be provided so as to be shifted from the central portion to the cut portion side, whereby the length of the tab can be arbitrarily set, and the excellent effect of increasing the degree of freedom in design is exerted.

[Brief description of drawings]

FIG. 1 is a plan view showing a simple opening structure according to a first embodiment of the present invention.

FIG. 2 is a side view showing a cross section of a main part of the embodiment.

FIG. 3 is an explanatory diagram showing an opening principle of a simple opening structure according to the present invention.

FIG. 4 is a plan view of an essential part showing a simple opening structure according to a second embodiment of the present invention.

[Explanation of symbols]

 1 can 1a center part 2 top part (lid body) 2a concave part 3 tab 3a force end 3b working end 3c finger hanging window 3d punching window 4 rivet (fulcrum) 5 opening cut part

Claims (2)

[Claims] 1. A tab which is attached to the top of a can via a rivet and acts so as to tear a cut portion for opening formed in a predetermined shape, wherein the rivet of the tab is displaced from the center of the can diameter. Was installed near the cut end,
And a simple opening structure using a can tab, wherein the ratio of the length of the rivet to the force end side and the length of the rivet to the working end side is set to about 3: 1 or more. 2. The simple opening structure with a can tab according to claim 1, wherein the cut portion for opening has a substantially circular shape or an elliptical shape along the circumferential direction of the can.