JP2000153836A - Can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can lid which enables the rapid, smooth discharge of contents and improvement in the ability of a lid piece to be opened and whose discharging opening is easy to open. SOLUTION: When an opening is made by breaking a score ling 8 with a tab 4, a lid strip 7 sinks down around a connection part 11 connecting the opening initial end 9 and opening terminal end 10 of the score line 8, thereby making the connection part 11 as close to a line LA passing through a rivet center O and being orthogonal to a tab center line C1 as possible, and also increasing the area of the overlapping portion of a hole 4a made near the rivet 3 of the tab 4 and the opening. Thus, a sufficient air intake part is secured in the upper part of the discharging part of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stay-tab type can lid capable of opening a pouring port (drink) with a tab attached to a can lid body.

[0002]

2. Description of the Related Art For example, as a can lid used for a steel can or an aluminum can containing various kinds of beverages, a pull tab type can lid for removing a tab from a can lid body when opening a spout or a spout is available. There has been known a stay-ion tub type can lid in which a drinking spout or a spout can be opened while the tab is still attached to the can lid body. Therefore, a stainless steel tub type can lid is widely used.

FIGS. 3 and 4 show such a stay-tub type can lid. In these figures, the can lid body 1 is formed in a substantially circular dish shape and fixed to an opening of a bottomed cylindrical can body 2, and a recessed portion 1 a which is lowered one step is formed at the center thereof. Rivets 3
The tab 4 is attached via the. This tab 4
In plan view from above the can body 2 as shown in FIG.
A ring-shaped finger hook 5 is formed at one end,
The other end is formed into a long plate shape having a semicircular lid contact portion 6 provided, and the center of the semicircular lid contact portion 6 is riveted by the rivet 3 to form a can lid body. 1 is fixed at the center.

The tab 4 connects the one end and the other end of the tab 4 and has a length from the rivet 3 to one end where the finger catching portion 5 is provided on the tab center line C1 passing through the rivet 3. The length L1 is set to be longer than the length L2 from the rivet 3 to the other end on which the lid piece contact portion 6 is provided.

On the other hand, the rivet 3 is attached to the can lid body 1 along the tab center line C 1 of the attached tab 4.
The cover piece 7 extending from the vicinity of to the outer peripheral side of the can lid body 1 is defined by a score line 8 in a tongue shape. The lid piece contacting portion 6 of the tab 4 is arranged so as to overlap a portion of the lid piece 7 defined by the score line 8 on the rivet 3 side.

Here, the score line 8 is formed by cutting the can lid body 1 in the thickness direction thereof, and when the finger catching portion 5 of the tab 4 is turned upward in the plan view, the rivet is formed. A center line C2 of the lid piece that connects the end 3 of the lid piece 7 to the outer peripheral end of the can lid body 1 originates near the left side of the rivet 3. Then, the rivet 3 is bent from the one end portion 9 so as to detour to the outer peripheral side of the can lid main body 1, extends beyond the lid piece center line C <b> 2 to the right side, and draws a convex curve, thereby forming the can lid main body. 1 and reaches the position furthest away from the rivet 3 when it again crosses the lid piece center line C2. Further, from this position, the score line 8 draws a convex curve, turns the left side of the cover piece center line C2 toward the rivet 3, and leaves the other end 10 leaving a slight gap with the one end 9.
Ends in

That is, the score line 8 is formed so as to be open in the vicinity of the rivet 3, and this portion serves as a connecting portion 11 for connecting the lid piece 7 and the other can lid body 1. ing. In addition, the cover 7 is formed with a bead 7a arranged in a ring convex shape along the peripheral edge thereof to reinforce the rigidity of the cover 7 along the circumferential direction.

[0008] To open the can container to which such a stay-tab type can lid is fixed, a finger is hooked on a finger hook 5 of the tab 4 and lifted.
Tab center line C1 and lid piece center line C perpendicular to the can lid body 1
The rotation may be performed in a plane including 2.

Thus, the finger hook 5 of the tab 4 becomes the point of force, the lid abutment 6 becomes the fulcrum, and the rivet 3 becomes the point of application. , The portion of the score line 8 located around the rivet 3 breaks first, and the popping operation ends.

Thereafter, when the finger hook 5 is further lifted and the tab 4 is bent and raised, the finger hook 5 of the tab 4 becomes a point of force, the rivet 3 becomes a fulcrum, and the lid contact portion 6 becomes an action point. The lid piece 7 is pressed by the lever principle.
Then, a crack runs along the score line 8 by this pressing force, and the lid piece 7 is pushed into the can body 2 to open the drinking spout,
The tier operation ends. At this time, since the lid piece 7 is connected to the can lid main body 1 by the connecting portion 11 of the score line 8, the depressed lid piece 7 is completely separated from the can lid main body 1 and becomes a waste piece. Absent. Note that reference numeral 12 in FIG. 9 denotes a tier start portion at which a portion located around the rivet 3 on the score line 8 in the score line 8 is first broken by the pop operation, and then the crack starts to progress. This is the intersection (maximum pressing portion) of the lid piece contacting portion 6 on which a large pressing force acts and the tab center line C1.

[0011]

In the case of the can lid having the above-mentioned structure, the score shape tends to be wide-mouthed. It is desired to ensure good pourability after opening. In order to obtain good pourability, the present inventors have conducted intensive studies.As a result, if a sufficient air intake portion is secured above the pouring portion of the contents of the opening of the can lid, cans can be removed from this air intake portion. It has been found that the contents can be quickly and smoothly poured out of the can by taking air stably into the inside.

[0012] The present invention has been made in view of the above circumstances, and an object of the present invention is to be able to quickly and smoothly pour out the contents and to improve the opening property of a lid piece. An object of the present invention is to provide a can lid which is easy to open a spout.

[0013]

According to a first aspect of the present invention, a tongue-shaped lid piece is defined by a score line cut out in the thickness direction of the can lid body, and a tip of a tab is placed on the lid piece. And the tab is fixed to the can lid body via a rivet, and the score line is broken by bending and raising the tab while abutting the tip of the tab on the lid piece. In the above, the opening start end of the score line is set so as to be in contact with a line passing through the rivet center and perpendicular to the tab center line, and the opening end of the score line passes through the rivet center and the It is installed in an area between a line perpendicular to the tab center line and a line passing through the intersection of the tab center line and the score line circling in the vicinity of the rivet and perpendicular to the tab center line. In the lid piece according to the second aspect of the present invention, the maximum width in the direction orthogonal to the tab center line is formed larger than the maximum width in the same direction as the tab center line. According to a third aspect of the present invention, in the score line broken by the pop operation, the area divided by the tab center line is smaller than the area of one of the areas adjacent to the tier start portion where the crack starts to be advanced by the tier operation. Are formed so as to have a larger area.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment shown in FIG. 1 and FIG. 2, the same parts as those in the conventional example shown in FIG. 3 and FIG. The can lid of the present embodiment also has a configuration in which the tab 4 is attached to the can lid body 1 via the rivet 3 as in the above-described conventional example. A U-shaped hole 4a is formed at the other end of the tab 4 so as to surround the rivet 3, and the rivet 3 side of the hole 4a attaches the tab 4 to the can lid body 1 by the rivet 3. Arc-shaped portion 4b.

The can lid body 1 is formed with a lid piece 7 defined by a score line 8 and extending from the vicinity of the rivet 3 toward the outer peripheral side of the can lid body 1. The contact portion 6 is arranged so as to overlap the portion of the lid piece 7 on the rivet 3 side. In the vicinity of the rivet 3,
A connecting portion (hinge portion) 11 for connecting the can lid main body 1 and the lid piece 7 at the outer portion of the score line 8 is provided, and one end (opening start end) 9 and the other end (opening) of the score line 8 are provided. The end portion 10 faces each other with the connecting portion 11 interposed therebetween.

The score line 8 is formed so as to go around the periphery of the rivet 3 so that the rivet 3 is arranged outside the score line 8, and the cover piece 7 is connected to the tab center line C
1, the maximum width in the direction orthogonal to the direction is larger than the maximum width in the same direction, and with the tab center line C1 as a boundary,
The other area (the left area in FIG. 1) is formed to be larger than the one area (the right area in FIG. 1) adjacent to the tier start portion 12.

Here, the shape of the score line 8 near the rivet 3 will be described in detail with reference to FIG. FIG. 2 shows a score line 8 when the finger catching portion 5 of the tab 4 is positioned upward in a plan view of the can lid main body 1. As shown in FIG. 2, the score line 8 draws a convex curve (first circular arc portion 8 a) protruding upward from the one end 9 near the left side of the rivet 3 as a start end. It was bent so as to detour to the outer peripheral side of the can lid main body 1, and further extended to the right side in the figure beyond the tab center line C1 (the rivet circling portion 8b).
Thereafter, a convex curve (second circular arc portion 8c) is drawn again, and is further separated from the rivet 3 while bypassing the vicinity of the outer peripheral edge of the can lid body 1 (tongue-like portion 8d) and connected to the one end portion 9 described above. It ends at the other end 10 which is disposed leaving the part 11.

The protruding end P1 of the second arc portion 8c is located closer to the tongue portion 8d (lower side in the figure) than the protruding end P2 of the first arc portion 8a. In other words, the imaginary line C3 connecting the tip P1 and the tip P2 is inclined downward to the right with respect to a direction orthogonal to the tab center line C1, and intersects with the tab center line C1. Furthermore, the opening start end 9 of the score line 8 is set so as to be in contact with the line LA passing through the rivet center O and orthogonal to the tab center line C1, and the opening end 10 of the score line 8 is Line L passing through the rivet center O and orthogonal to the tab center line C1
A and an area A between an intersection P of the tab center line C1 and the score line 8 (rivet circling portion 8b) orbiting the vicinity of the rivet 3 and a line LB orthogonal to the tab center line C1. is set up.

In order to open the can container having the above-configured can lid to which the can lid is fixed, the user hooks the finger on the finger hook 5 of the tab 4 and lifts the tab 4 around the rivet 3 as in the prior art. It is rotated in a plane perpendicular to the can lid body 1 and including the tab center line C1. As a result, the finger hook 5 of the tab 4 becomes a point of emphasis, the lid piece contacting part 6 becomes a fulcrum, and the rivet 3 becomes an application point.
Is lifted upward, the portion of the score line 8 located around the rivet 3 breaks first, and the popping operation ends.

Thereafter, when the finger hook 5 is further lifted and the tab 4 is bent and raised, the finger hook 5 of the tab 4 becomes the point of force, the rivet 3 becomes the fulcrum, and the lid contact part 6 becomes the point of action. The lid piece 7 is pressed by the lever principle.
Then, a crack runs along the score line 8 by this pressing force, and the lid piece 7 is pushed into the can body 2 to open the drinking spout,
The tier operation ends. In this case, the tear start portion 12 where the crack starts to be advanced in the tear operation performed after the pop operation and the maximum pressing portion a where the greatest pressing force acts during the tear operation are arranged close to each other. The bending and raising force can be used as a shearing force effective for the crack progression of the score line 8.

In the can lid thus opened, the lid piece 7 sinks downward about the connecting portion (hinge portion) 11 connecting the opening start end 9 and the opening end 10 of the score line 8. Thereby, an opening is formed between the lid piece 7 and the can lid main body 1 with the broken score line 8 interposed therebetween. In this case, the connecting portion 11 is brought as close as possible to a line LA passing through the rivet center O and orthogonal to the tab center line C1, and a hole 4a formed near the rivet 3 of the tab 4 and the opening are formed. (For example, the area indicated by hatching in FIG. 1).
17 mm ² ) can be increased, so that a sufficient air intake portion can be secured above the pouring portion of the opening. Therefore, the contents can be quickly and smoothly poured out while the opening property of the lid piece 7 is maintained well, and the pourability can be improved.

Here, the opening start end 9 of the score line 8
Is located at one end side (finger-holding portion side) of the tab 4 beyond the line LA passing through the rivet center O and orthogonal to the tab center line C1, and around the rivet 3 of the score line 8 during the pop operation. When the located portion breaks, the force is not sufficiently transmitted to the opening start end 9 of the score line 8, the opening start end 9 does not break smoothly, and the score line 8 formed in the vicinity of the rivet 3 is not broken. Is increased, there is a problem that the strength around the rivet 3 where the tab 4 is attached to the can lid body 1 is weakened.

The opening end 10 of the score line 8 is connected to a line L passing through the rivet center O and orthogonal to the tab center line C1.
When the tab line 4 is located at one end side (finger-holding portion side) beyond A, the score line 8 cannot be broken to the opening end portion 10 in the tear operation, and the lid piece 7 Is bent. Further, since an excessive force is applied to the tab 4, there is a problem that the tab is easily cut. Therefore, in the present embodiment, the opening start end 9 of the score line 8 is connected to the center of the rivet in order to secure an opening having a sufficient air intake portion and to consider a good opening property and can lid strength. O, and is set so as to be in contact with a line LA orthogonal to the tab center line C1.
Through the rivet center O and the tab center line C1
And the intersection point P between the tab center line C1 and the rivet circling portion 8b, and the tab center line C1
In a region A between a line LB and a line LB orthogonal to.

[0024]

According to the first aspect of the present invention, the opening start end of the score line is set so as to be in contact with a line passing through the center of the rivet and perpendicular to the center line of the tab, and the opening end of the score line has an opening end. An area between a line passing through the rivet center and orthogonal to the tab center line and a line passing an intersection of the tab center line and a score line orbiting near the rivet and orthogonal to the tab center line. When the score line is broken by the tab to form an opening, the lid piece is centered on a line (hinge position) connecting the opening start end and the opening end of the score line. By sinking downward, the hinge position can be brought as close as possible to a line passing through the center of the rivet and perpendicular to the center line of the tab, and the overlap between the hole formed near the rivet of the tab and the opening can be reduced. What it is coupled with that can increase the area of the portion, it is possible to ensure a sufficient air intake portion to the upper portion of the pouring portion of the opening. Therefore, it is possible to quickly and smoothly pour out the contents while maintaining the opening property of the lid piece satisfactorily, and it is possible to improve the pourability. According to the second aspect of the present invention, good pouring in a wide mouth lid using a lid piece in which the maximum width in the direction orthogonal to the tab center line is larger than the maximum width in the same direction as the tab center line. Nature can be secured. According to a third aspect of the present invention, in the score line broken by the pop operation, the area divided by the tab center line is smaller than the area of one of the areas adjacent to the tier start portion where the crack starts to be advanced by the tier operation. Since the area of the region is formed larger, the tear start portion where the crack starts to be advanced in the tear operation performed after the pop operation, and the lid piece on which the greatest pressing force acts during the tear operation Since the tip and the intersection of the tab center line are close to each other, the bending force of the tab can be used as a shearing force effective for the progression of the score line crack, thereby improving the operability when the lid piece is opened. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a can lid showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a score line.

FIG. 3 is a plan view showing an example of a conventional can lid.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 can lid body 3 rivet 4 tab 4a hole 4b arc-shaped part 7 lid piece 8 score line 8a arc part (first arc part) 8b rivet circling part 8c arc part (second arc part) 9 one end (opening start end) DESCRIPTION OF SYMBOLS 10 Other end part (opening end part) 11 Connection part (hinge part) 12 Tier start part C1 Tab center line P1 Protruded end part (of 2nd circular arc part) P2 Protruded end of 1st circular arc part O Center of rivet P Tab center Intersection point between line C1 and rivet circling portion 8b LA Line passing through rivet center O and orthogonal to tab center line C1 LB Line passing through intersection point P and orthogonal to tab center line C1

Claims (3)

[Claims] 1. A tongue-shaped lid piece is defined by a score line cut out in a thickness direction of a can lid body, and a tip end portion of a tab is arranged on the lid piece, and the tab is connected via a rivet. In the can lid which is fixed to the can lid body and breaks the score line by bending and raising the tab while abutting the tip of the tab on the lid piece, the opening start end of the score line is The score line is set so as to be in contact with a line passing through the center of the rivet and orthogonal to the center line of the tab, and the end of the opening of the score line passes through the center of the rivet and orthogonal to the center line of the tab. A can lid provided in a region between an intersection of a line and a score line orbiting in the vicinity of the rivet and a line perpendicular to the tab center line. 2. The can lid according to claim 1, wherein the lid has a maximum width in a direction perpendicular to the tab center line larger than a maximum width in the same direction as the tab center line. . 3. The area divided by the center line of the tab, which is smaller than the area of one area adjacent to the tier start portion where the crack starts to be advanced by the tier operation in the score line broken by the pop operation. 3. The method according to claim 1, wherein the area is larger.
The can lid as described.