JPH08301279A - Container requiring no can opener and its opening method - Google Patents

Abstract

PURPOSE: To obtain a container that can be simply and speedily opened without the need of a can opener to be attached, and provide its opening method. CONSTITUTION: An opening top end 2 of a container 1 has a convex-shaped part 21 that protrudes outward of the container 1. Although an upside notch 22 is cut in the upside of the opening top end 2 at an adequate location along the circumference of the convex-shape part 21 and an underside notch 23 in the underside of the opening top end 2 at an adequate location along the circumference of the convex-shaped part 21, the container 1 is still airtight. The convex-shaped part 21 of the opening top end 2 of the container 1 is pressed and pushed into the container 1, so that the opening top end 2 is sheared open along the upside and underside notches 22 and 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container which does not require an opening device and a method for opening the container. TECHNICAL FIELD The present invention relates to a container that can be opened without using an opening tool and an opening method thereof. INDUSTRIAL APPLICABILITY The present invention can be used for a hermetically-sealed container that stores a soft drink, an alcoholic drink, and the like.

[0002]

2. Description of the Related Art A conventional opening mechanism for a sealed container such as a beverage can is an opening tool (commonly called "tab"), an attachment tool (rivet) and two notched grooves (commonly called "score" called "score"). )) Etc., the lever principle is used, that is, the pressing force is increased by the lever ratio of the unsealing tool, and the notch effect by the notch groove is used to open the container (Actual opening 62-1).
18026, Japanese Utility Model Laid-Open No. 62-152919, JP-A-5-7
7830).

[0003]

However, in the conventional opening mechanism for a sealed container such as a beverage can, it is indispensable to attach the above-mentioned opening tool. The present invention achieves a simpler and quicker opening than the conventional opening mechanism of a hermetically sealed container, and eliminates the need for attaching the above-mentioned unsealing tool, which is indispensable for the conventional opening mechanism of a hermetically sealed container. An object of the present invention is to provide a container that does not require an opening device and a method for opening the container, which can save energy and realize cost reduction.

[0004]

A container which does not require an opening device according to the first aspect of the present invention is a container which does not require an opening device and which has a closed structure and has an opening surface part, and at least the opening surface part of the container is It has a spherical convex shape that is formed by projecting outside the container by subjecting the thin plate base material to plastic working, and further, a surface cutout groove is formed at an appropriate position surrounding the spherical convex section on the outer surface of the unsealing surface portion. The inner surface of the thin plate base material is formed with a rear surface cutout groove formed at an appropriate position surrounding the spherical convex portion.

The container opening method of the present invention which does not require the opening tool is the container of the present invention which does not require the opening tool, wherein the spherical convex portion is pressed to be depressed into the container, The opening is obtained by tearing the thin plate base material forming the unsealed surface portion from the front surface notch groove and the back surface notch groove.

[0006]

The container of the present invention which does not require the unsealing tool and its unsealing method are described as follows: "When a load is applied in the opposite direction after the load is applied to the metal material until plastic deformation occurs, the load is applied in that direction from the beginning. Compared to the case where the load is small, plastic deformation occurs with a small load, that is, the yield point decreases, and the notch effect that "the stress concentrates in the notch." It is opened by pressing force such as.

In the container of the present invention, since the spherical convex portion is formed by subjecting the thin plate base material forming the container to plastic working, the tensile stress is preliminarily applied to the outer periphery of the spherical convex portion of the thin plate base material. Is working. Further, the container is provided with a spherical convex portion and a front surface notch groove and a rear surface notch groove formed so as to surround the spherical convex portion. Therefore, when the spherical convex portion of the container is pressed with a finger, in the state where the spherical convex portion is projected to the outside while being pressed, a portion between the front surface notch groove and the back surface notch groove is subjected to compressive stress. receive.
Just before the spherical convex portion is depressed into the container due to the pressing force,
The compressive stress becomes maximum, and when the state shifts into the inside of the container, the portion between the front notch groove and the back notch groove receives tensile stress.

As described above, the tensile stress is applied to the portion between the front surface notch groove and the back surface notch groove in advance during the processing of the spherical convex portion, and the compressive stress is first applied during opening. Since further tensile stress is applied thereafter, it is possible to cause plastic deformation of the portion between the front face notch groove and the rear face notch groove by a force smaller than that of the conventional unsealing method by only pulling due to the Bauschinger effect. . Further, stress concentration occurs due to the notch effect in the portion between the front surface notch groove and the back surface notch groove, so that the tearing of the unsealed surface portion occurs accurately at that portion. In the present invention,
Since the cutout grooves are provided on the front surface and the back surface, respectively, stress concentration is more likely to occur in the portion thinned by the cutout grooves, as compared with the conventional case where the cutout grooves are on the same side.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. (1) Configuration of Aluminum Can of the Present Embodiment The aluminum can 1 of the present embodiment has a lid member 2 as shown in FIG.
And a body member 3 are two-piece cans. Lid member 2
Is made of an aluminum plate having a thickness of 0.2 to 0.4 mm and a diameter of about 60 mm, and as shown in FIGS.
1, a front surface notched groove 22, a back surface notched groove 23,
It is equipped with. The spherical convex portion 21 is obtained by pressing the lid member 2 and has a substantially spherical shape with a radius of about 45 mm, and the crown portion projects from the plane of the lid member 2 by about 5 mm to the outside of the can.

The surface cutout groove 22 is a groove having a quadrangular cross section with a depth of 0.1 to 0.2 mm and a width of 0.1 to 0.2 mm, and has a substantially spherical spherical convex portion on the surface of the lid member 2. The spherical convex portion 21 is placed at a position about 0.5 mm away from the contour of 21.
It is formed in an arc shape so as to surround the. The back surface cutout groove 23 has a depth of 0.1, similar to the front surface cutout groove 22.
To 0.2 mm and a width of 0.1 to 0.2 mm in a quadrangular cross section. It is formed in an arc shape so as to surround the spherical convex portion 21. Both the front surface notch groove 22 and the back surface notch groove 23, which are formed in an arc shape, are interrupted at the relief portion 24. The distance between the back surface cutout groove 23 and the front surface cutout groove 22 may be about 0.05 to 0.5 mm.

(2) Method for opening aluminum can of this embodiment The method for opening an aluminum can of this embodiment will be described below with reference to FIGS. 4 to 7. First, as shown in FIG. 4, the spherical convex portion 21 is pressed with the thumb. The spherical convex portion 21 is pushed down by the thumb to be in a state as shown in FIG. When the pressing is further continued, the spherical convex portion 21 is further pushed down and is depressed inside the can as shown in FIG. If you continue pressing,
As shown in FIG. 7, the spherical convex portion 21 is torn from the lid member 2 along the front surface cutout groove 22 and the back surface cutout groove 23 to obtain an opening. The surface notch groove 22
Also, since the rear surface cutout groove 23 has an arc shape and the relief portion 24 is provided as an uncut portion of the groove, the spherical convex portion 21 torn from the lid member 2 may fall out into the container. There is no.

Front cutout groove 22 and back cutout groove 2
Tensile stress is applied to the portion between 3 at the time of processing the spherical convex portion. In the state shown in FIGS. 4 and 5, the portion between the front surface notch groove 22 and the rear surface notch groove 23 receives a compressive stress from the center of the lid member 2 toward the outer periphery. The compressive stress becomes maximum in the state of FIG. 5, and as shown in FIG. 6, when the spherical convex portion 21 shifts to the state of being depressed inside the can, the portion between the front surface notch groove 22 and the rear surface notch groove 23 is formed. On the contrary, will be subject to tensile stress.

As described above, a compressive stress is first applied at the time of opening to the portion between the front notch groove 22 and the back notch groove 23 to which the tensile stress is applied at the time of processing, and then the tensile stress is applied. The applied stress reduces the yield stress due to the Bauschinger effect. Therefore, with a smaller force than the conventional opening method using only pulling,
Front notch groove 22 and back notch groove 2 which are tearing parts
It is possible to cause plastic deformation of the portion between 3 and 4. Also,
Since stress concentration occurs due to the notch effect in the portion between the front surface notched groove 22 and the back surface notched groove 23, the lid member 2 can be accurately torn at the portion.

The present invention is not limited to those shown in the above embodiments, but various modifications may be made within the scope of the present invention depending on the purpose and application. That is, in the container of the present invention, the front surface notch groove 22 is the back surface notch groove 2
3, which is closer to the spherical convex portion than 3 but has a surface cutout groove 22.
May be closer to the outer circumference than the rear surface cutout groove 23.
Further, the front surface cutout groove 22 and the back surface cutout groove 23 may be provided on the front and back surfaces of the lid member 2 at the same position. Further, the material is not limited to aluminum, and any material such as steel may be used as long as the object of the present invention can be achieved.

The thickness of the lid member 2 and various dimensions and shapes of the spherical projection 21, the front surface notch groove 22, the back surface notch groove 23 and the like, which are substantially spherical, are determined by calculation and experiments in material mechanics. It can be various values to satisfy. That is,
The distance between the front surface notch groove 22 and the rear surface notch groove 23 is
It can also be 0.05 to 2.0 mm. The cross-sectional shapes of the front surface notched groove 22 and the back surface notched groove 23 are quadrangular in this embodiment, but may be triangular, home-base-shaped pentagonal, or the like. Surface notch groove 22
When the distance between the rear notch groove 23 and the rear notch groove is relatively short, stress concentration is more likely to occur when the bottom portion of the notch groove is acute, and it is considered effective to make the cross-sectional shape of the notch groove triangular. .

[0016]

The container and the method for opening the container of the present invention utilize the Bauschinger effect and the notch effect to open the container with a pressing force of a thumb or the like. Therefore, according to the present container and the present opening method, the opening is easier and quicker than the conventional one, and the opening tool and the attachment tool are not required, which saves resources and energy and reduces the cost. Can be realized.

[Brief description of drawings]

FIG. 1 is a plan view of a container that does not require the opening device of the present invention.

FIG. 2 is a cross-sectional view seen from the front of a container that does not require the opening device of the present invention.

FIG. 3 is an explanatory view showing details of a spherical convex portion, a front surface cutout groove, and a rear surface cutout groove formed on a lid member of a container that does not require the opening device of the present invention.

FIG. 4 is an explanatory view showing a first pressed state in the opening process of the container opening method of the present invention.

FIG. 5 is an explanatory view showing a state in which the spherical convex portion is compressed in the opening process of the container opening method of the present invention.

FIG. 6 is an explanatory view showing a state where the spherical convex portion is depressed inside the container in the opening process of the container opening method of the present invention.

FIG. 7 is an explanatory view showing a final state in which the lid member tears along the front surface cutout groove and the back surface cutout groove in the opening process of the container opening method of the present invention.

[Explanation of symbols]

1; Aluminum can, 2; Lid member, 21; Spherical convex portion, 22;
Front notch groove, 23; Back notch groove, 24; Relief part, 3; Body member, 4; Thumb.

Claims (2)

[Claims] 1. A container having an opening structure, which has a closed structure and does not require an opening tool, and at least the opening surface part of the container is formed by subjecting a thin plate base material forming the opening surface part to plastic working to project outside the container. It has a formed spherical convex shape, and further, a surface cutout groove is formed at an appropriate position surrounding the spherical convex portion on the outer surface of the unsealing surface portion, and the spherical surface is formed on the inner surface of the thin plate base material. A container that does not require an opening tool, characterized in that a rear surface cutout groove is formed at an appropriate position surrounding the convex portion. 2. The container not requiring the unsealing tool according to claim 1, wherein the spherical convex portion is pressed to be depressed into the container, and the thin plate base material constituting the unsealing surface portion is formed into the surface cutout groove. And a method for opening a container that does not require an opening tool, characterized in that the opening is obtained by tearing from the notch on the back surface.