JP2012197103A - Tab for easy-to-open can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tab for an easy-to-open can lid that can prevent breakage and cracking at both ends of a tongue hole even with a thinned wall.SOLUTION: The tab 1 for the easy-to-open can lid includes a mounting piece 11 of tongue piece shape stuck by a rivet part 6 to a panel part 3 of the can lid 2 carved with a score line 4 for partitioning an opening piece 5; a fingerhold part 7 formed on one end side away from the rivet part 6; a press-down part 8 formed on the side opposite to the fingerhold part 7 with the rivet part 6 placed in between; and the tongue hole 12 provided around the mounting piece 11 to isolate the mounting piece 11 from the other part. When the fingerhold part 7 is lifted, a lever action is generated to perform the opening operation of the can lid 2 by the press-down part 8. Folded parts 18 formed by folding the edge parts that form the tongue hole 12 are formed at both end portions of the tongue hole 12.

Description

  The present invention relates to an easy-to-open can lid that can be easily opened by a tab, and more particularly to a tab for pushing the opening piece open by lever action.

  Conventionally, in the lid of a beverage can, a steion tab (SOT) type can lid that performs an opening operation with an opening operation tab fixed to the panel portion of the can lid is often used. In such a steion tab type can lid, like the can lid described in Patent Document 1, a fixing portion for attaching the tab to the rivet portion of the can lid body is formed. In order to make it easy to lift, a notch that surrounds the periphery of the fixed portion in a substantially U shape is formed.

JP 2006-315705 A

  In recent years, it has become a technical challenge to reduce the material used for lids from the viewpoint of reducing material costs, and in the can lids as described above, the thickness of the metal plate material constituting the tabs should be made thinner than before. However, if the metal plate, which is the material of the tab, is changed to a thinner one than before, the strength of the tab is reduced accordingly.

  On the other hand, when the tab finger rest is lifted during the opening operation, the side portion of the tab is lifted upward together with the tab finger rest, while the fixing portion attached to the panel portion of the can lid remains in the same position. As a result, the end portion of the notch located at the connecting portion between the side portion of the tab and the fixing portion is twisted. When the tab is thinned and the strength is weakened, the torsional force (mainly shearing force) may cause the end of the cut to break in the direction of the extension line, which may cause defective opening.

  The present invention has been made against the background described above, and an object of the present invention is to provide a tab which is not easily damaged even when it is formed from a thin metal plate material.

  In order to achieve the above object, the invention of claim 1 is a tongue-like attachment piece fixed by a rivet portion to a panel portion of a can lid in which a score line for defining an opening piece is engraved, A finger hook portion formed on one end side away from the rivet portion, a push-down portion formed on the opposite side of the finger hook portion across the rivet portion, and the attachment piece around the attachment piece to other portions An easy-to-open can lid tab comprising a tongue hole that is isolated from a tongue, and wherein a lever action is generated by lifting the finger-hanging portion so that the opening portion of the can lid can be opened by the push-down portion. The tab is characterized in that a folded portion is formed by folding back the edge portion forming the tongue hole at both end portions of the tab.

  A second aspect of the present invention is the tab according to the first aspect of the present invention, wherein the folded portion is formed by folding the end edge portion 180 degrees and folding it in half.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the finger hook portion, the rivet portion, and the push-down portion are formed relatively long in a direction of a center line, and the folded portion is a longitudinal direction of the tab The tab is formed in a range from both ends of the tongue hole to a position corresponding to the center of the rivet portion.

  A fourth aspect of the present invention is the tab according to any one of the first to third aspects, wherein peripheral portions of both end portions of the tongue hole are inclined obliquely downward from the front surface to the back surface side. .

  According to the first aspect of the present invention, the strength of the both end portions of the tongue hole is increased by forming the folded portion where the end edge portion of the tongue hole is folded at both end portions of the tongue hole. Even when a twisting force (shearing force in a tearing direction) is applied to both end portions of the tongue hole when the portion is lifted, it is possible to prevent the both end portions of the tongue hole from breaking in the extension line direction.

  According to the invention of claim 2, since the folded portion is formed by folding the end edge portion by 180 °, the two plate members at both end portions of the tongue hole are overlapped. Both end portions of the hole can be made more difficult to break.

  According to the invention of claim 3, the folded portion is formed in a range from the both ends of the tongue hole to the center of the rivet portion in the longitudinal direction of the tab. It is possible to prevent cracks from being generated and cracks from occurring at portions other than the extension line direction of both end portions of the tongue hole.

  According to the invention of claim 4, since the peripheral portions of both end portions of the tongue hole are inclined obliquely downward with respect to the horizontal direction of the tab, the finger-hanging portion is lifted vigorously, and the end portions of the tongue hole are Even when a stronger twisting force is applied, bending is applied to the periphery of both ends of the tongue hole, and the strength is further increased, so that both ends of the tongue hole break in the direction of the extension line. Can be reliably prevented.

It is a reverse view which shows an example of the tab which concerns on this invention. FIG. FIG. 3 is a partial cross-sectional view taken along arrow A in FIG. 2. It is a top view of an easy opening can lid. It is the vertical side view.

  The tab 1 according to the present invention is fixed to a steion tab (SOT) type easy opening lid and used for opening operation. Examples of the easy opening can lid 2 to which the tab 1 according to the present invention is fixed are shown in FIGS. 4 and 5, and the can lid 2 shown in these drawings is press-formed from a thin metal plate material such as an aluminum alloy. A score line 4 is engraved on the disk-shaped panel portion 3, an opening piece 5 defined by the score line 4 is formed, and a rivet portion for fixing tabs at the center of the panel portion 3. 6 is formed. As will be described later, the tab 1 fixed to the rivet portion 6 has a finger hook portion 7 formed on one end side, and by lifting the finger hook portion 7, the push-down portion 8 formed on the other end side is pushed down. The score line 4 is broken and opened by such lever action with the rivet portion 6 as a fulcrum. The tab 1 is formed to be relatively long in the direction of the center line connecting the finger hook portion 7, the rivet portion 6, and the push-down portion 8, and in the present embodiment, in the axial direction (longitudinal direction) of the tab 1. On the other hand, the push-down portion 8 side is assumed to be the front, and the finger-hanging portion 7 side is assumed to be the rear.

  As an example, the tab 1 according to the present invention is formed by cutting into a predetermined shape by press molding using a band-shaped metal plate made of an aluminum alloy or the like as a raw material. In the example shown in FIGS. The rear side where the portion 7 is formed has a rectangular shape with rounded corners, and the depressed portion 8 side is curved in an arc shape, and is formed into a deformed rectangular shape as a whole. Is curled by double or triple folding to form a curled portion 9. The finger hook 7 formed on the rear side includes a ring hole 10 that is a long hole extending in the direction along the short side when the overall shape of the tab 1 is a rectangular shape, and the inner periphery thereof is on the back side. It is curled.

  The push-down portion 8 formed at the front end portion is formed so that the outer peripheral edge forms an arc shape in plan view. A mounting piece 11 extending from the inner peripheral side of the push-down portion 8 toward the rear of the tab 1 (toward the ring hole 10) is formed. The attachment piece 11 is a tongue-like (tongue piece-like) portion made of a metal plate constituting the tab 1, and is a portion in contact with the panel portion 3 in the can lid 2. That is, a tongue hole 12 that is a predetermined shape (for example, U-shaped) notch formed by punching the tab 1 in the thickness direction is formed in a range of about 3/4 around the attachment piece 11. Further, the attachment piece 11 is formed with a rivet hole 13 that penetrates in the plate thickness direction and into which the rivet portion 6 is inserted.

  The push-down portion 8 is a tab when the connecting portion (not shown) that connects and holds the tab 1 to the strip-shaped metal plate material is cut while the tab 1 is formed from the strip-shaped metal plate material (not shown). A separation convex portion 14 that is a cut end portion on one side, and a triple curled portion 15 that is formed on both sides of the separation convex portion 14 and is curled so that the longitudinal section has at least a triple structure of a metal plate. Yes. The separating protrusions 14 are accommodated in the gaps between the triple curled portions 15 and are formed on the same outer peripheral edge so as not to protrude from the outer peripheral edge of the push-down portion 8.

  The upper surface of the connection portion connecting the attachment piece 11 and the push-down portion 8 between the attachment piece 11 and the push-down portion 8 is recessed downward (back side) between the push-down portion 8 and the attachment piece 11. The fan-shaped concave panel portion 16 is formed. That is, the bottom surface of the concave panel portion 16 is formed so as to be positioned below the top surface of the attachment piece 11.

  On the other hand, on the side of the tab 1, convex beads 17 extending in the longitudinal direction of the tab 1 and projecting to the surface side of the tab 1 are formed one by one on the left and right, and when the tabs 1 are stacked one by one The curled portion 9 on the side of the back surface of the tab 1 is in contact with the convex bead 17 so that the upper and lower tabs 1 can be aligned with each other by the convex bead 17 and the curled portion 9.

  The tongue hole 12 that divides the mounting piece 11 described above is a slit-shaped portion punched out along the outer peripheral edge of the mounting piece 11, and both end portions of the tongue hole 12 (pressing portions in the axial direction of the tab 1). In the two left and right end portions located on the 8 side), the peripheral portion is inclined obliquely downward (back side) with respect to the horizontal direction of the tab 1 (the direction along the surface of the tab 1), and the peripheral portion thereof. In addition, as shown in FIG. 3, a folded portion 18 is formed in which an end edge portion of the tongue hole 12 (a cut end cut out in a U shape) is folded. The folded portion 18 is formed by folding the peripheral edge portion of the end edge portion of the tongue hole 12 in a range of 90 ° to 180 ° (preferably 120 ° to 180 °, more preferably 180 °). The inclination angle of the peripheral portion is set in a range of 20 ° to 90 ° (preferably 30 ° to 80 °) with respect to the horizontal direction of the tab 1.

  In the range from the both ends of the tongue hole 12 in the longitudinal direction of the tab 1 to a position corresponding to the center of the rivet hole 13, the folded portion 18 continues along the inner peripheral side and the outer peripheral side of the peripheral edge of the tongue hole 12. It is preferable to be formed.

  According to such a tab 1, the folded portion 18 in which the edge of the tongue hole 12 is folded back is formed at both end portions of the tongue hole 12, so that the work hardening of the metal plate by the folding molding and the tongue hole are performed. The strength of this portion increases, for example, by increasing the section modulus at both end portions of 12. In other words, the breaking strength of the base portion (or connecting portion) of the attachment piece 11 with respect to the so-called main body portion of the tab 1 is increased. Therefore, even when a twisting force is applied to both end portions of the tongue hole 12 when the finger hooking portion 7 of the tab 1 is lifted, the both end portions of the tongue hole 12 can be prevented from breaking in the direction of the extension line.

  Further, since the folded portion 18 is formed by folding the edge portion 180 °, the two plate members at both end portions of the tongue hole 12 are overlapped, so that both end portions of the tongue hole 12 are further broken. Can be difficult.

  Further, the folded portion 18 is formed in a range from both ends of the tongue hole 12 to a position corresponding to the center of the rivet hole 13 in the axial direction (longitudinal direction) of the tab 1, so that the tongue hole 12 is opened during the opening operation. It is possible to prevent cracks from occurring in portions other than the extension line direction of both end portions of the tongue hole 12 as well as cracks in the extension line direction of both end portions of the tongue hole 12.

  Furthermore, since the peripheral portions of both end portions of the tongue hole 12 are inclined obliquely downward with respect to the horizontal direction of the tab 1, the finger-hanging portion 7 is lifted vigorously, and the both end portions of the tongue hole 12 are stronger. Even when a twisting force is applied, bending is applied to the peripheral portion of both end portions of the tongue hole 12, and the strength of this portion is further increased, so that both end portions of the tongue hole 12 are in the extension line direction. Breakage can be reliably prevented.

  Therefore, according to the tab according to the present invention, the strength of the base connecting the mounting piece to the so-called main body portion of the tab, that is, the strength of both ends of the tongue hole can be increased by the folded portion. Therefore, the metal plate, which is the material of the above, can be made thin, and as a result, the material of the tab and the easy opening can lid can be reduced, and the environmental load can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Tab, 2 ... Easy opening can lid, 3 ... Panel part, 4 ... Score line, 5 ... Opening piece, 6 ... Rivet part, 7 ... Finger hook part, 8 ... Push-down part, 9 ... Curl part, 10 ... Ring hole 11 ... Installation piece, 12 ... Tung hole, 18 ... Folding part.

Claims (4)

A tongue-shaped attachment piece fixed by a rivet portion to a panel portion of a can lid in which a score line for partitioning an opening piece is engraved, a finger hook portion formed on one end side away from the rivet portion, A push-down portion formed on the opposite side of the finger-hanging portion with the rivet portion interposed therebetween, and a tongue hole that separates the attachment piece from other portions around the attachment piece, and lifts the finger-hanging portion In the tab for easy opening of the can lid that is configured to perform the opening operation of the can lid by the push-down portion due to the lever action,
A tab for an easy-to-open can lid, characterized in that a folded portion is formed at both end portions of the tongue hole by folding back the edge portion forming the tongue hole.   2. The easy-opening can lid tab according to claim 1, wherein the folded portion is formed by folding the end edge portion 180 degrees and folding it in half.   It is formed relatively long in the direction of the center line connecting the finger hook portion, the rivet portion, and the push-down portion, and the folded portion corresponds to the center of the rivet portion from both ends of the tongue hole in the longitudinal direction of the tab. 3. The easy-open can lid tab according to claim 1 or 2, wherein the tab is formed in a range up to a position.   4. The easy-open can lid tab according to claim 1, wherein peripheral portions of both end portions of the tongue hole are inclined obliquely downward from the front surface to the back surface side.

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