JP2007076673A - Can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To break a main score all the way along its circumference even if the area of an opening is made large. <P>SOLUTION: The upper face 10a of the body of a can lid has a rivet 11 projecting upward, and the opening 14 defined by the main score 13. A tab 15 is attached to the rivet 11 so that its one end 15a covers the opening 14. By pulling the other end 15b of the tab 15 upward, the other end 15a presses the opening 15 downward, thereby breaking the main score 13 and admitting the passage of the opening 14. The tab 15 is attached to the rivet 11 so as to be slidable in the direction of the diameter of the body 10 of the can lid. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a can lid that is wound around an opening of a can body.

  In general, this type of can lid has, as shown in, for example, Patent Document 1 below, a rivet and a dimple that are convex upward and an opening defined by a main score on the upper surface of the can lid body. The dimple and the opening are formed so as to face each other across the rivet, and include a tab fixed to the rivet so that one end overlaps the opening and the other end overlaps the dimple. A finger hole that is open in the thickness direction of the tab is formed at the other end of the tab.

  The can lid configured in this manner is wound around the opening of the can body filled with the contents to form a can, and in the consumer, among the peripheral wall portions defining the finger holes of the tab, By pulling up the peripheral wall portion (hereinafter, referred to as “lifting portion”) located at the other end of the tab, the tongue portion of the tab attached to the rivet is pulled up, and the one end portion serves as a fulcrum. The main score starts to break by being moved downward and by applying a shearing force to the starting point of the main score located between the tongue and the one end of the tab on the upper surface of the can lid body. It has become. Then, by continuously pulling up the lifting portion of the tab and pressing the opening downward by the one end, the main score is broken over the entire circumference and the opening is opened. .

By the way, in recent years, there is an increasing demand for improving the pouring property of contents. As a means for improving the pouring property, for example, it is conceivable to increase the opening area of the opening by increasing the circumference of the main score.
Japanese Patent No. 3468548

  However, in the conventional can lid, when the opening area of the opening is increased, the main score may not be able to be broken over the entire circumference. That is, in order to apply a sufficient shearing force to the main score and break it well, it is necessary to reduce the distance between the one end of the tab and the main score, but the starting point of the main score is the can lid. Since it is located between the rivet and the one end of the tab in a plan view of the main body, if the opening area of the opening is increased without changing the distance between the starting point and the one end, the start point is excluded. In the main score, the distance from the one end portion was increased, and there was a case where a sufficient shearing force did not act and a portion that could not be broken was generated.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a can lid that can be broken over the entire circumference even if the opening area of the opening is increased. To do.

  In order to solve the above problems and achieve the above object, the can lid of the present invention can solve the above problems and achieve the above object. A rivet that is convex upward and an opening defined by a main score are formed on the upper surface of the main body, and a tab attached to the rivet so that one end overlaps the opening. A can lid that is configured to open the opening by pulling the other end of the tab upward and pressing the opening downward to break the main score. The tab is slidable in the radial direction of the can lid body and attached to the rivet.

  According to the present invention, since the tab is slidable in the radial direction of the can lid body and attached to the rivet, in the process of breaking the main score from its start point to its end point, By sliding the tab toward the hard-to-break part when the distance between the one end part of the tab is large and the shearing force sufficient to break is difficult to break. The distance can be shortened. Therefore, even if the peripheral length of the main score is increased to increase the opening area of the opening, the sufficient shearing force can be applied to the entire periphery of the main score.

  When the tab is slidable in the direction from the one end to the other end, when the tab is slid in this manner, the one end of the tab facing the rivet side of the opening is a rivet. The one end can be moved backward with respect to the opening. Therefore, when drinking the contents after opening the opening, the opening as a drinking mouth can be expanded by sliding the tab.

  Here, a rivet hole into which the rivet is inserted is formed between the one end portion and the other end portion of the tab, and the rivet hole may be a long hole extending in a radial direction of the can lid body. .

  In this case, it is possible to easily and surely attach the rivet so that the tab can slide in the radial direction of the can lid body. In addition, since the distance between the upper surface of the can lid body and the upper surface of the tab can be maintained at the current level, it is possible to prevent the good stacking performance from being hindered by making the tab slidable.

  Further, when the can lid body is viewed in plan, a finger hooking recess is formed on the opposite side of the opening with the rivet interposed therebetween, and the tab is slidable in the direction from the one end to the other end. The rivet may be attached to the rivet, and when the tab is slid, the other end portion may overlap the finger hook recess.

  In this case, before pulling up the other end of the tab and opening the opening, the tab is slid in advance and the other end is overlaid on the finger resting recess, and then on the lower surface side of the other end. It is possible to put up a finger and pull up the other end. Therefore, when opening the opening, it becomes possible to easily insert a finger into the lower surface side of the other end, and the can lid can be provided with good openability.

  Further, a dimple that is convex upward is formed on the opposite side of the opening with the rivet in plan view of the can lid body, and the lower surface side of the other end of the tab is the dimple. And may be slidable in the direction from the one end to the other end and attached to the rivet.

  In this case, when the tab is slid, the other end portion of the tab can be guided upward from the lower surface side by dimples. Therefore, it becomes possible to increase the distance between the other end and the upper surface of the can lid body, and when opening the opening, it is further ensured that a finger can easily enter the lower surface of the other end. Can be realized.

  According to the present invention, the main score can be broken over the entire circumference even if the opening area of the opening is increased.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a schematic configuration of a can lid shown as an embodiment of the present invention.

  The can lid is made of pure aluminum or an aluminum alloy, and has a rivet 11 and dimples 12 projecting upward on an upper surface (hereinafter referred to as “can lid main body upper surface”) 10 a of the can lid main body 10, An opening 14 defined by the score 13 is formed. The dimple 12 is disposed on the opposite side of the opening 14 with the rivet 11 in between, and one end 15a overlaps the opening 14 while the dimple 12 The other end portion 15b is generally configured to have a tab 15 attached to the rivet 11 so as to overlap.

In addition, a concave groove 16 is formed on the outer peripheral edge of the can lid main body upper surface 10a over the entire circumference, and is connected to the outer peripheral edge of the concave groove 16 and above the upper surface 10a of the can lid main body. A folded portion 17 extending in the direction and folded outward in the radial direction is formed.
The can lid is a so-called steion tab type can lid used for beverage cans, and the outer diameter of the folded portion 17 in the can where the folded portion 17 is wound around the opening of the can body. Is about 50 mm to 61 mm.

  A finger hole 15c that opens in the thickness direction of the tab 15 is formed in the other end portion 15b of the tab 15. The peripheral wall portion that defines the finger hole 15c is positioned at the other end of the tab 15. The peripheral wall portion to be used is a lifting portion 15d that is lifted when the opening portion 14 of the can lid is opened.

  Two dimples 12 are formed on the top surface 10a of the can lid body, and each of these dimples 12 and 12 is a straight line connecting the central portion in the width direction of the opening 14 or the tab 15 and the central axis of the can lid body 10. It is formed so as to be opposed to each other with respect to each other. On the dimples 12 and 12, the lower surface side of both end portions of the second peripheral wall portion 15e that is disposed to face the lifting portion 15d among the peripheral wall portions that define the finger holes 15c of the tab 15 is disposed. ing.

  That is, the dimple 12 is formed at a position where the outer edge portion on the lower surface side of the other end portion 15b of the tab 15 is hooked, whereby a force to rotate about the central axis acts on the tab 15. However, the outer edge portion of the tab 15 is caught by the dimples 12 and 12 so that the rotational movement of the tab 15 can be prevented.

  Further, in the can lid main body upper surface 10a, the concave groove 16 is formed between the dimple 12 and the portion of the concave groove 16 facing the lifting portion 15d in the direction from the one end 15a to the other end 15b of the tab 15. An independent finger hooking recess 10b is formed.

  Here, between the one end portion 15a and the other end portion 15b of the tab 15 is a tongue portion 15f attached to the rivet 11, and the rivet 11 is inserted into a rivet hole 15g formed in the tongue portion 15f. The tongue 15 f is attached to the rivet 11 with the lower surface of 15 f in contact with the upper surface 10 a of the can lid body.

  In order to attach the tab 15 to the rivet 11, first, a nipple portion that is convex upward is pressed on a can lid body member having a flat central surface in the radial direction, and then the rivet of the tab 15 is formed. In a state where the nipple portion is inserted into the hole 15g, the nipple portion is crushed from the upper surface side of the can lid main body member, and the upper end portion is enlarged to form the rivet 11, and the tab 15 is attached to the rivet 11. .

  In the present embodiment, the rivet hole 15g is a long hole extending in the direction from the other end 15b toward the one end 15a. The width of the elongated hole is made smaller than the outer diameter of the upper end portion of the expanded rivet 11. As described above, the tab 15 is attached to the rivet 11 so as to be slidable in the radial direction of the can lid body 10 in the direction from the one end portion 15a to the other end portion 15b.

  Further, in the state of FIG. 1 in which the tab 15 is slidable in the direction from the one end portion 15a to the other end portion 15b, the other end of the tab 15 is the inner side of the finger cover recess 10b in the radial direction of the can lid body 10. It is located along the periphery. Therefore, when the tab 15 is slid in the direction from the one end 15a to the other end 15b, the inner peripheral surface of the rivet hole 15g on the one end 15a side and the outer peripheral surface of the rivet 11 are brought into contact with each other. As shown in FIG. 2, the other end of the tab 15 or the lifting portion 15d is overlapped with the finger hooking recess 10b.

For example, the opening 14 of the can lid configured as described above can be opened as follows.
First, as shown in FIG. 2, the tab 15 is slid in the direction from the one end portion 15a to the other end portion 15b in a state where the lower surface of the tongue portion 15f is in contact with the upper surface 10a of the can lid body, and the one end portion 15a is moved. While being close to the starting point portion 13a of the main score 13, the pulling portion 15d is overlapped on the finger hooking concave portion 10b.

  Further, at this time, the tab 15 is slid in a state where the lower surface of the tongue portion 15f is in contact with the upper surface 10a of the can lid body. Therefore, in the course of this sliding, the dimple 12 supporting the lower surface side of the other end portion 15b. Thus, the other end portion 15b of the tab 15 is guided upward so that the angle formed between the upper surface 10a of the can lid main body and the lower surface of the portion of the tab 15 extending from the tongue portion 15f to the lifting portion 15d is increased.

  Next, a finger is put between the upper surface 10a of the can lid main body and the lifting portion 15d of the tab 15, and the lifting portion 15d is pulled upward to break the starting point portion 13a of the main score 13. Then, by continuing the pulling up further, the main score 13 is broken toward the end point portion 13b. In the process, in the main score 13 excluding the starting point portion 13a, the distance between the tab 15 and the one end 15a of the tab 15 is large, and the opening 14 or the portion as a portion where it is difficult to apply a shearing force sufficient to break When ruptured to a point before a main score 13 (hereinafter referred to as “hardly breakable portion 13 c”) excluding a start point portion 13 a located on a straight line connecting the central portion of the tab 15 in the width direction and the central axis of the can lid body 10. The tab 15 is slid toward the hard-to-break part 13c to reduce the distance, and then the pulling is continued to break the hard-to-break part 13c. Thereafter, by continuing the pulling up further, the main score 13 is broken to the end point 13b and the opening 14 is opened.

  As described above, according to the can lid according to the present embodiment, the tab 15 is slidable in the radial direction of the can lid main body 10 and is attached to the rivet 11, so that the main score 13 is reached from the start point 13a to the end point. In the process of breaking toward the portion 13b, when the tab 15 is broken from the starting point portion 13a to the front of the hardly breakable portion 13c, the distance can be shortened by sliding the tab 15 toward the hardly breakable portion 13c. become. Therefore, even if the peripheral length of the main score 13 is lengthened and the opening area of the opening portion 14 is increased, a sufficient shearing force for breaking can be applied to the entire periphery of the main score 13.

  Further, in this embodiment, the tab 15 is slidable in the direction from the one end portion 15a to the other end portion 15b. Therefore, when the tab 15 is slid in this way, the opening 14 faces the rivet 11 side. The one end 15 a of the tab 15 is close to the rivet 11, and the one end 15 a can be moved backward with respect to the opening 14. Therefore, when drinking the contents after opening the opening 14, the tab 15 can be slid to widen the opening 14 as a drinking mouth.

  Furthermore, since the rivet hole 15g is a long hole extending in the radial direction of the can lid body 10, it is possible to easily and surely attach the tab 15 to the rivet 11 so as to be slidable in the radial direction of the can lid body 10. Can do. Further, since the distance between the can lid main body upper surface 10a and the upper surface of the tab 15 can be maintained at the same level as the present, it is possible to prevent the good stacking property from being hindered by making the tab 15 slidable.

  Further, when the tab 15 is slid, the lifting portion 15d overlaps with the finger hooking concave portion 10b. Therefore, before the opening portion 14 is opened by lifting the lifting portion 15d of the tab 15, the tab 15 It is possible to lift the lifting portion 15d by placing the finger on the lower surface side of the lifting portion 15d and then placing the finger on the lower surface side of the lifting portion 15d. Therefore, when opening the opening part 14, it becomes possible to easily insert a finger into the lower surface side of the lifting part 15d, and this can lid can be provided with a good openability.

  Further, when the tab 15 is slid, the other end 15b can be guided upward by the dimple 12 from the lower surface side. Therefore, it becomes possible to increase the distance between the other end 15b and the can lid main body upper surface 10a, and at the beginning of opening the opening 14 by lifting the lifting portion 15d of the tab 15, the lower surface of the lifting portion 15d It is possible to more reliably realize that the finger is easily inserted.

  Before the tab 15 is lifted and opened, the tab 15 is slidable in the direction from the one end 15 a toward the other end 15 b, so that the one end 15 a and the starting point 13 a of the main score 13 are formed. When the can lid is transported with the can lid wound around the opening of the can body, the starting point portion 13a is inadvertently broken by the vibration acting on the can. Can be prevented.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the configuration in which the tab 15 is slidable in the radial direction of the can lid body 10 in the direction from the one end portion 15a to the other end portion 15b is shown. You may employ | adopt the structure made to be able to slide to the radial direction of the can lid main body 10 in the direction which cross | intersects the direction which goes to the other end part 15b. Further, the tab 15 may be slid in a plurality of directions in the radial direction of the can lid body 10.

  The structure which slides the tab 15 is not restricted to the structure which makes the rivet hole 15g a long hole like the said embodiment. Further, the present invention can also be applied to the can lid main body 10 that does not have the finger resting recess 10 b and the dimple 12.

  Even if the opening area of the opening is increased, the main score can be broken over the entire circumference.

FIG. 1 is a plan view showing a can lid shown as an embodiment of the present invention, before a tab is slid. FIG. 2 is a plan view showing the can lid shown as one embodiment of the present invention, after the tab is slid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Can lid main body 10a Can lid main body upper surface 10b Finger hook recessed part 11 Rivet 12 Dimple 13 Main score 14 Opening part 15 Tab 15a One end part 15b Other end part 15g Rivet hole

Claims (4)

A rivet that is convex upward and an opening defined by the main score are formed on the upper surface of the can lid body, and the rivet is attached to the rivet so that one end overlaps the opening. A can lid provided with a tab, wherein the one end presses the opening downward to break the main score by pulling the other end of the tab upward, thereby opening the opening There,
A can lid, characterized in that the tab is slidable in a radial direction of the can lid body and attached to the rivet. The can lid according to claim 1,
A rivet hole into which the rivet is inserted is formed between the one end and the other end of the tab, and the rivet hole is a long hole extending in a radial direction of the can lid body. Can lid. The can lid according to claim 1 or 2,
A finger hook recess is formed on the opposite side of the opening with the rivet in plan view of the can lid body, and the tab is slidable in the direction from the one end to the other end. A can lid attached to a rivet, wherein the other end overlaps with the finger hook recess when the tab is slid. The can lid according to any one of claims 1 to 3,
A dimple that is convex upward is formed on the opposite side of the opening with the rivet in plan view of the can lid body,
The tab is supported by the dimple and is slidable in a direction from the one end to the other end and attached to the rivet. .

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