JP3575584B2 - Can opening for cap with elastic hook and method of manufacturing the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a can mouth for a cap with an elastic hook.
[0002]
[Prior art]
BACKGROUND ART Conventional cans for caps with elastic hooks are disclosed in Japanese Utility Model Publication No. Sho 62-45210 and Japanese Utility Model Publication No. Sho 55-26262. In the former case, as shown in FIG. 14, a can opening 32 (base) manufactured as a single body is fixedly fastened to a top plate 31 of a can by a winding portion 33. The can opening 32 has a cylindrical portion 32a facing upward from the winding portion 33, a neck portion 32b above it, a bulging portion 32c for engaging a cap with an elastic hooking piece above it, and a hollow ring-like opening above it. 32d. In the latter case, two examples shown in FIGS. 15 and 16 are shown. The can opening 35 in FIG. 15 is manufactured as a single unit and is fixedly fastened to the top plate 31 by the fastening portion 33. However, in this case, the opening 35d is different from the former in that it is formed in a shape curved toward the inner diameter side, and the other is similar to the former. The opening 40d in FIG. 16 has an opening 40d that is curved to the inner diameter side approximately as in FIG. 15, and the cylindrical portion is not provided below the engagement bulging portion 42, and the height is increased accordingly. The height from the surface of the top plate 31 to the opening 40 d is reduced by forming an annular concave portion 46 that lowers the base end of the can mouth below the surface of the top plate 31.
[0003]
[Problems to be solved by the invention]
However, in the conventional example shown in FIG. 14, since the can mouth 32 is formed as a single body and is wound around the top plate 31, the material cost and the number of man-hours are increased. When the ring-shaped opening 32d is projected above the bulging portion 32c, a cap with elastic hooks is supplied from the dropping chute to the can opening 32 of the can body flowing on the line to automatically mount the cap. In addition, there is a problem in that the claw of the cap being supplied is caught by the ring-shaped opening 32d, which hinders the mounting. The one shown in FIG. 15 does not protrude above the bulging portion 35c. Therefore, when the cap with the elastic hook is automatically attached, the trouble as in the above-described example does not occur. Forming and fastening to the top plate has the same problem as in the above example, and the upper end of the bulging portion 35c is curved toward the inner diameter side to form the opening portion 35d. When the end is located on the inner diameter side of the can opening and the contents of the can are corrosive, there is a problem that the end is easily corroded. In addition, since the height of the can 35 is high, there is a problem that the can 35 contacts the back surface of the stacked cans when stacking the cans. In the case shown in FIG. 16, the height of the can mouth 40 is reduced by lowering the base end of the can mouth 40 below the top plate with the annular concave portion 46, so that when the cans are stacked, Although there is an advantage that the can end 40 does not come into contact with the back surface, there is a problem that the end portion is easily corroded by the contents because the curved end portion of the opening 40d is located on the inner diameter side.
[0004]
Therefore, the present invention has been made in view of the above-mentioned problems, and reduces the material cost and the number of manufacturing steps, and has an elastic hook having a structure in which a bent end portion forming a can mouth is not corroded by contents. The purpose is to provide a can for a cap.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a ring-shaped neck portion 4 formed at a base end of a can opening of the top plate in a can end for a cap with an elastic hook formed at a required position on the top plate. A cap-engaging swelling portion 5 with elastic hooks swelling laterally upward and in a ring shape, an upwardly open concave deep groove 6 formed on the inner diameter side of the swelling portion 5, and the concave deep groove 6 The inner peripheral edge of the can is bent to the outer diameter side, and the end 6a is folded into the concave deep groove 6 to form the opening 7 and the can opening 1 is provided, and the inner diameter of the can opening is set with a plastic cap or the like. The can is formed on a cylindrical surface 7a with which the stopper comes into surface contact when the stopper is plugged, and the can port 1 and the top plate 3 are integrally formed.
According to the present invention, the opening 7 of the can 1 is bent into the deep groove 6 with the bent end 6a folded, that is, the bent end 6a is positioned outside the opening 7 so that the content can be improved. The part prevents the edge from being corroded. Since the bent end 6a is folded into the deep groove 6 and the end 6a is not exposed, the end 6a is hardly corroded even if the end 6a drips into this portion. Further, since there is no portion protruding above the bulging portion, trouble such as a claw of the cap being caught at the time of automatic insertion of the cap does not occur.
The inner diameter of the can mouth 1 is defined as an opening 7 formed in a cylindrical cylindrical surface 7a that comes into contact with the stopper when the can mouth 1 is plugged with a plastic cap or the like. When the can is plugged in the can opening, the plug comes into surface contact and the sealing effect is improved.
Claim 2 is characterized in that an annular concave portion 8 is formed on the top plate 3 side to sink the base end of the can opening 1 below the top plate surface.
In the present invention, the can opening 1 is sunk in the annular recess 8 so that the can opening does not come into contact with the back surface of the can when the cans are stacked.
Claim 3 is a method of manufacturing a cap can with an elastic hook formed at a required position on a top plate, wherein a first step of punching a top plate material by a press, a reinforcing structure of the top plate surface and an outer diameter A second step of simultaneously press-forming the folded portion, a round hole opened at a position where the can opening of the top plate material is to be formed, and a diagonally upwardly slanted upper surface of the top plate concentrically with the round hole. A third step of simultaneously press-forming a skirt portion, a cylindrical portion extending vertically upward from an inner diameter end of the skirt portion, and a disk portion extending horizontally and centrally at an upper end of the cylindrical portion; A fourth step of simultaneously press-forming a stepped part formed concentrically and horizontally with the round hole and a cylindrical part extending upward in the middle of the inclined surface forming the step, and the stepped part of the cylindrical part A ring-shaped neck bulging radially inward at a side base end, and above the ring-shaped neck; A fifth step of simultaneously press-forming the cap-securing bulge portion with the elastic hook which bulges outward in the outer diameter direction, and a sixth step of forming an upward U-shaped deep groove portion on the inner diameter side of the bulge portion. The inner diameter at which the plug is brought into surface contact when the can is closed with a plastic cap or the like by bending the upper end on the inner diameter side of the deep groove portion toward the outer diameter side and folding the end portion into the deep groove. A seventh step of forming an opening having a cylindrical surface as an opening, and an eighth step of press-forming an annular concave portion, which sinks the base end of the can mouth below the top plate surface, toward the top plate. It is assumed that.
According to this aspect, the same operation and effect as those of the first aspect are obtained.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. 1 to 13 show an embodiment of the present invention. FIG. 1 is a sectional view of a can mouth for a cap with an elastic hook according to the present invention, and FIGS. 2 to 13 are views showing a manufacturing process of the can mouth.
[0007]
As shown in FIG. 1, the can 1 for a cap with an elastic hook is formed at a required position on a top plate 3 of a can, and the can 1 is sealed with a cap 2 with an elastic hook so that the contents and the outside air can be sealed. Is to shut off between The shape of the can 1 for a cap with an elastic hook according to the present invention is such that a ring-shaped neck portion 4 bulging toward the inner diameter side is formed at the base end on the top plate 3 side, and bulges outward toward the outer diameter side. The cap-engaging bulging portion 5 with elastic hooks is extended, and the upper portion thereof is bent to the inner diameter side to extend the upwardly open concave deep groove 6 to form the inner diameter of the opening 7. The opening 7 is formed by bending the upward end located on the side of the outer side toward the outer diameter side and folding the end 6a into the deep groove 6, and furthermore, the can opening 1 of this shape is formed integrally with the top plate. Is what you do.
[0008]
The can opening 1 has a cylindrical surface 7a in which the inner diameter of the opening 7 is vertical, and an annular concave portion 8 is formed at the base end of the can opening 1 to sink the can opening downward.
[0009]
Next, a method for manufacturing the can mouth 1 will be described with reference to FIGS. As a first step, a rectangular top plate 3 (steel plate) as shown in the end view of FIG. 2 and the plan view of FIG. As a second step, as shown in the end view of FIG. 4 and the plan view of FIG. 5, the reinforcing structure 20 is formed on the entire surface, and the folded portion 21 connected to the can body is simultaneously formed on the outer peripheral edge by pressing. As a third step, as shown in the end view of FIG. 6, the plan view of FIG. 7, and the sectional view of the can mouth portion of FIG. A skirt portion 10 which is concentric with the round hole 9 and which is sloping obliquely upward and circularly from the surface of the top plate 3, a cylindrical portion 11 extending vertically upward from the inner diameter edge of the skirt portion 10, and an upper end of the cylindrical portion 11 The disk portion 12 extending horizontally and in the center direction is simultaneously press-formed. As a fourth step, as shown in the cross-sectional view of the can mouth portion in FIG. 9, a stepped portion 14 formed concentrically with the round hole 9 and in the horizontal direction in the middle of the inclined surface forming the skirt portion 10, The cylindrical portion 11 extending upward is press-formed at the same time. As a fifth step, as shown in FIG. 10, the cylindrical portion 11 is expanded into a ring-shaped neck portion 4 in which the base end of the stepped portion 14 side is expanded in the inner diameter direction, and is expanded upward in the outer diameter direction. The cap-engaging bulging portion 5 with elastic hooks to be made is simultaneously press-formed. As a sixth step, as shown in FIG. 11, an upward U-shaped deep groove 6 is press-formed on the inner diameter side of the bulging portion 5. As a seventh step, as shown in FIG. 12, the peripheral edge 6 a located above the inner diameter side of the deep groove 6 is bent outward, and its end is folded into the deep groove 6, thereby opening the opening 7 of the can opening 1. Press molding. As an eighth step, as shown in FIG. 13, an annular concave portion 8 is formed by pressing the base end of the can opening 1 below the surface of the top plate 3.
[0010]
As shown in FIG. 1, a packing 15 is interposed between the opening 7 of the can 1 and the cap 2 with the elastic hook, and the cap 2 with the elastic hook is pressed against the can 1 formed as described above. Is pushed open to enter, falls into the ring-shaped neck 4 formed at the lower part of the bulging portion 5, and is sealed by the elastic force of the elastic hook. At this time, the opening 7 of the can mouth 1 is bent into the outer diameter side and is wound into the deep groove 6, so that the end does not touch the contents and there is no danger of corrosion due to the contents. In addition, since the end is caught in the deep groove 6 and is not exposed, there is no possibility that the end is corroded even if the content drips to that portion.
[0011]
Conventionally, when the contents are silicon or electronic parts, a can made of a corrosion-resistant laminated steel sheet is used in consideration of the corrosion resistance of the can, and a resin cap is used for this can opening. . As another method, there is a case where an atrin can or the like in which a bag for isolating the contents is inserted into the can is used, and a resin cap is similarly used at the mouth of the bag. In addition, there is also a case where a can made of a corrosion-resistant laminated steel plate such as a polyskirt or polyneck made of a resin such as polyethylene or polypropylene is inserted as a rust-free can mouth, but in the case of applying this application, By integrally forming the can and can mouth using a corrosion-resistant laminated steel plate, there is no need to manufacture a resin can mouth by itself and insert it into the can. It becomes possible. In the case of using a poly cap (poly cap), the inner diameter of the opening of the can mouth of the present application forms the cylindrical surface 7a, so that the poly plug comes into surface contact and reliably keeps the air-tightly inserted state. It becomes possible.
[0012]
【The invention's effect】
According to the present invention, the upper part of the bulging portion for engaging the cap with the elastic hook is bent to the inner diameter side to extend the upwardly open concave deep groove 6, and the bent end is folded into the concave deep groove 6. By forming the opening in the bent state, there is no danger that the bent end is corroded when the opening end of the can opening is on the outer diameter side of the opening, that is, at a position where the contents do not touch. Furthermore, since the end is folded into the deep groove 6 and is not exposed, even if the content drips to that portion, it does not corrode. In addition, since there is no portion protruding above the bulging portion, there is no trouble such as a claw of the cap being hooked when the cap is automatically inserted. Further, by integrally forming the can mouth with the top plate, it is possible to reduce material costs and shorten the manufacturing process. When the opening is plugged with a resin cap or the like by forming a cylindrical surface in the vertical direction to the inner diameter of the opening, the cap comes into surface contact and the airtight tightly inserted state is reliably maintained. It is possible to do. Further, by sinking the base end portion of the can mouth below the top plate surface, the can mouth does not come into contact with the back surface of the stacked cans, making the stacking easy and safe.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a can mouth of the present invention.
FIG. 2 is a view showing a manufacturing process of a can mouth.
FIG. 3 is a diagram showing a manufacturing process of a can mouth.
FIG. 4 is a diagram showing a manufacturing process of a can mouth.
FIG. 5 is a diagram showing a manufacturing process of a can mouth.
FIG. 6 is a view showing a manufacturing process of a can mouth.
FIG. 7 is a diagram showing a manufacturing process of a can mouth.
FIG. 8 is a view showing a manufacturing process of a can mouth.
FIG. 9 is a diagram showing a manufacturing process of a can mouth.
FIG. 10 is a diagram showing a manufacturing process of a can mouth.
FIG. 11 is a diagram showing a manufacturing process of a can mouth.
FIG. 12 is a diagram showing a manufacturing process of a can mouth.
FIG. 13 is a view showing a manufacturing process of a can mouth.
FIG. 14 is an explanatory view of a conventional can mouth.
FIG. 15 is an explanatory view of a conventional can mouth.
FIG. 16 is an explanatory view of a conventional can mouth.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Can opening 2 Cap with elastic hook 3 Top plate 4 Ring neck 5 Swelling part 6 Deep groove 7 Opening 8 Annular concave part 9 Round hole 10 Skirt part 11 Cylindrical part 12 Disk part

Claims (3)

A ring-shaped neck portion 4 formed at the base end of the can mouth of the top plate, and a swelling laterally and in a ring-like manner above the can neck for the cap with elastic hooks formed at a required position on the top plate. The swelling portion 5 for engaging the cap with the elastic hook, the concave deep groove 6 formed on the inner diameter side of the swelling portion 5, and the inner peripheral edge of the concave deep groove 6 are bent outwardly. An opening 7 formed by folding the end 6a into the concave deep groove 6 provides the can opening 1, and the inner surface of the can opening comes into surface contact with the can opening when the can opening is closed with a plastic cap or the like. A can mouth for a cap with elastic hooks, wherein the can mouth is formed on a cylindrical surface 7a and the can mouth 1 and the top plate 3 are integrally formed. 2. A can mouth for a cap with an elastic hook according to claim 1, wherein an annular concave portion for sinking a base end portion of the can mouth below a top plate surface is formed on the top plate side. In a method of manufacturing a can mouth for a cap with an elastic hook formed at a required position on a top plate,
A first step of punching the top plate with a press,
A second step of simultaneously press-forming the reinforcing structure on the top plate surface and the bent portion having the outer diameter;
A round hole opening at a position where a can port of the top plate material is to be formed; a skirt portion that is skewed diagonally upward from the top plate surface concentrically with the round hole; and a vertically extending upper portion from the inner diameter end of the skirt portion. A third step of simultaneously press-forming a cylindrical part to be formed and a disk part extending horizontally and centrally at the upper end of the cylindrical part;
A fourth step of simultaneously press-forming a stepped portion formed concentrically and horizontally with a round hole and a cylindrical portion extending upward in the middle of the inclined surface forming the skirt portion,
A ring-shaped neck bulging radially inward at the stepped portion-side base end of the cylindrical portion; and a cap-securing bulge with elastic hooks bulging outwardly above the ring-shaped neck. A fifth step of simultaneously press-forming the protrusion and
A sixth step of forming an upward U-shaped deep groove on the inner diameter side of the bulging portion;
When the upper end of the inner diameter side of the deep groove is bent to the outer diameter side, and the end is folded into the deep groove, the inner diameter at which the plug comes into surface contact when the can mouth is plugged with a plastic cap or the like is a cylindrical surface. A seventh step of forming an opening,
And an eighth step of press-forming an annular concave portion on the side of the top plate in which the base end of the can port is sunk below the surface of the top plate.

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