JP2008018963A - Easily openable can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance conveyability and packability in a stack by providing an easily openable can lid with a structure which prevents an interference of a finger hook portion in the case of the stacking of cans, while maintaining finger hook properties when the finger hook portion is lifted. <P>SOLUTION: This easily openable can lid for an overall opening comprises a can lid body 5 in which a score 2 for the overall opening is engraved and in which an embossed portion 4 for enhancing the surface rigidity of a portion 3 to be opened, enclosed with the score 2, is formed, and a tab 7 for breaking the score, which is fixed to the can lid body 5 via a rivet portion 6. The embossed portion 4 is formed in such a shape as to be convex on the outer surface side and concave on the inner surface side, and the tab of the lower can lid does not interfere with the embossed portion 4 of the upper can lid in the stacking of the cans. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an easily openable can lid, and more particularly to an easily openable can lid for opening the entire surface.

As this type of conventional easy-open can lid, for example, those shown in FIGS. 2 (A) and 2 (B) are known.
That is, a can lid main body 104 in which an embossed portion 103 for enlarging the surface rigidity of the planned opening portion 102 engraved with the entire surface opening score 101 and surrounded by the full surface opening score 101 is formed, and the can lid main body 104. And a score breaking tab 106 fixed through a rivet portion 105. The embossed portion 103 was formed in a convex shape on the inner surface side and a concave shape on the outer surface side. In addition, the finger hooking portion 107 of the tab 106 is made higher than the tab main body 108, and the concave portion 108 is formed in the panel portion immediately below the finger hooking portion 107 to widen the gap between the finger hooking portion 107 and the can lid main body 102. The improvement of the property was aimed at.

  On the other hand, conventionally, the can lid transport line is configured to continuously transport the can lids in a line along the transport guide. However, the embossed portion 103 is convex on the inner surface side and on the outer surface side. Since it has a concave shape, when the can lids are stacked, as shown in FIG. 2C, the embossed portion 103 of the upper can lid main body 102 in which the tab 106 of the lower can lid protrudes to the inner surface side or It partially interferes with the recess 108 and the degree of overlap is not stable. In particular, since the finger hooking portion 107 of the tab 106 is higher than the tab main body 108, the finger hooking portion 107 abuts and becomes unstable.

  Therefore, when the can lids rattle, the amount of the cushion that is transported increases while the distance between the can lids is not constant and densely spreads, and the finger hook part 107 collides and is damaged or severe In this case, the tilted can lid is caught by the conveyance guide and deformed. In order to prevent such a problem, stable control of the transfer equipment at low speed is required, and there is a problem that it cannot cope with high-speed production.

Also, when packing in a row, the number of lids that fits in the specified bag length will be reduced, leading to a decrease in customer delivery volume and, in turn, a decrease in production efficiency of beverage cans etc. at the customer. There was a problem.
In addition, as another prior art which raised the finger hook part, there exists a thing as described in patent document 1, for example.
Japanese Patent Publication No.55-10456

  The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to prevent the tab of the lower can lid from interfering with the embossed portion of the upper can lid when stacked. The purpose is to provide an easily openable can lid for opening the entire surface, and to improve the transportability and packing property in a stacked state.

In order to achieve the above object, the invention according to claim 1 is a can in which an embossed portion is formed in which a score for opening the entire surface is engraved and the surface rigidity of the planned opening portion surrounded by the score for opening the entire surface is increased. In an easily openable can lid for full-surface opening comprising a lid body and a score breaking tab fixed to the can lid body via a rivet portion, the embossed portion is convex on the outer surface side and recessed on the inner surface side. The tabs of the lower can lid do not interfere with the embossed portion of the upper can lid when stacked.
The invention according to claim 2 is such that the finger hook portion of the tab is higher than the tab main body with respect to the outer surface of the can lid main body, and the tab finger hook portion is the embossed portion of the upper can lid when stacked. It is characterized in that it can be stored.

The invention according to claim 3 assumes that the embossed portion assumes a rotation trajectory drawn by the finger hook portion when the tab is rotated about the central axis of the can lid body, and projects the rotation trajectory onto the can lid body. It is provided on the rotation trajectory projection area of the finger hook portion.
In the invention according to claim 4, the finger hooking portion of the tab is located on the rivet portion side with respect to the center of the can lid body, and the embossing portion is provided on the side opposite to the tab with respect to the center of the can lid body. The finger hook part of the tab of the lower can lid stored in the part is configured to be allowed to move in the rotational direction by a predetermined angle θ to the left and right with respect to the center line passing through the center of the rivet part and the can lid body. It is characterized by.

According to the first aspect of the present invention, the embossed portion that increases the surface rigidity of the planned opening portion has a convex shape on the outer surface side and a concave shape on the inner surface side, so that the tab of the lower can lid is maintained while maintaining the surface rigidity. Interference with the embossed portion can be prevented, and the can lid row is transported in a stable state during transport, and production at high speed is also possible.
Also, when packing in a state of being stacked in a row, the overlap allowance can be reduced by the amount of the embossed portion, and production efficiency is not reduced.
According to the invention which concerns on Claim 2, when the finger hook part of the tab is higher than the tab main body, the embossing part provided in the inner surface of the upper can lid with the finger hook part of the tab of the lower can lid If it fits in the recessed part, it can pile up stably. Therefore, the can lid row is transported in a stable state during transportation, and the conventional problems such as scratches caused by the finger hook portion and deformation due to tilting are eliminated, and high-speed production is possible.
In addition, when packing in a state where they are stacked in a row, the number of lids that fall within the determined bag length is the same as a can lid that does not raise the finger hook, so that production efficiency is not reduced.

According to the invention which concerns on Claim 3, a finger hook part is naturally accommodated in an embossing part by the relative rotation between can lids at the time of conveyance.
According to the invention which concerns on Claim 4, since a finger hook part will be accommodated in an embossing part if the space | interval between can lids is in a fixed angle range, a finger hook part tends to be settled in an embossing part.

The present invention will be described below based on the illustrated embodiments.
FIG. 1 shows an easy-open can lid for full-surface opening according to an embodiment of the present invention.
The easy opening can lid 1 for full surface opening has a full opening score 2 engraved and is formed with an embossed portion 4 that increases the surface rigidity of the planned opening portion 3 surrounded by the full opening score 2 A lid main body 5 and a score breaking tab 7 fixed to the can lid main body 5 via a rivet portion 6 are provided. A finger hooking portion 71 of the tab 7 is formed on the outer surface of the can lid main body from the tab main body 72. It is high.

  The can lid body 5 includes a disk-shaped panel portion 51, a chuck wall portion 52 rising upward from the peripheral edge of the panel portion 51, and a can body (not shown) extending radially outward from the upper end portion of the chuck wall portion 52. And a winding curled portion 53 that is wound together with the winding flange portion. The score 2 for opening the entire surface is provided in a circular shape along the outer peripheral edge of the panel portion 51, and the planned opening portion 3 opens almost the entire surface of the panel portion 51.

  The tab 7 is a substantially oval-shaped breaking tool having rigidity, a fixing portion 73 fixed to the rivet portion 6 provided in the planned opening portion 3, and a tab functioning as a pressing action portion extending toward the whole opening score 2. It is comprised from the front-end | tip part 74 and the knob | pick part 75 extended on the opposite side to the tab front-end | tip part 74 with respect to the rivet part 6. FIG. The knob portion 75 has an elliptical finger hook hole 76, and an end plate portion connecting the rear end portions of the side plate portions 77 and 77 located on the left and right of the finger hook hole 76 is a finger hook portion 71. The tab tip portion 74 and the side plate portion 77 of the knob portion 75 constitute a flat tab main body portion 72 having the same upper surface, and the finger hook portion 71 becomes a predetermined height higher than the tab main body portion 72. Yes.

The embossed portion 4 is convex on the outer surface side and concave on the inner surface side, and when stacked, the finger hook portion 71 of the tab 7 of the lower can lid can be stored in the embossed portion 4 of the upper can lid It is configured. That is, the embossed portion 4 assumes a rotation trajectory drawn by the finger hook portion 71 when the tab 7 is rotated around the center O of the can lid main body 5 as a rotation center, and projects the rotation trajectory onto the can lid main body 5. Provided on the rotation trajectory projection region R of the finger hook portion 71.
In the illustrated example, the outer diameter line R <b> 1 of the rotation trajectory projection region R is a circle that passes through the left and right ends of the finger hook portion 71, and has a diameter that is approximately one third of the diameter of the panel 41. The inner diameter line R2 is a circle inscribed in the outer edge of the finger hook portion 71, and has a diameter that is approximately half of the outer diameter line R1. An annular region between the outer diameter line R1 and the inner diameter line R2 is a rotation trajectory projection region R of the finger hook portion.

In this example, the finger hook portion 71 of the tab 7 is positioned on the rivet portion 6 side by a predetermined dimension with respect to the center O of the can lid body 5, and the embossed portion 4 is located with respect to the center O of the can lid body 5. The embossed portion 4 is configured to be provided on the opposite side of the tab 7 and has a fan shape that opens at an angle of 90 ° or more to the left and right with respect to a center line N passing through the center O of the rivet portion 6 and the can lid body 5. Yes. In other words, the fan shape has a large arc portion 41 having a diameter larger than the outer diameter line R1 of the rotation trajectory projection region R and slightly smaller than the peripheral edge of the panel portion 51, and a central portion slightly smaller in diameter than the inner diameter line R2 of the rotation trajectory projection region R. The small arc portion 42 is surrounded by the left and right ends of the large arc portion 41 and the straight portions 44, 44 connecting the left and right ends of the small arc portion 42 via the left and right arc portions 43, 43.
The finger hook portion 71 of the lower can lid tab 7 accommodated in the fan-shaped embossing portion 4 is allowed to move in the rotational direction by a predetermined angle θ from the center line N to the left and right. At the limit position, the outer edge portion of the finger hook portion 71 abuts on the fan-shaped linear portion 44. The movement allowable angle θ in the rotation direction of the tab 7 is an angle formed between the tab center lines T and T and the center line N connecting the rivet portion 6 of the tab and the center O of the can lid body 5 at the left and right limit positions.

In addition, a stepped recess 8 having a predetermined depth is provided in a portion corresponding to the finger catching portion 71 of the planned opening portion 3, so that a structure in which the finger catching portion 71 is made higher is easier to catch.
The stepped recess 8 is substantially triangular in this example, and the left and right oblique sides 81 and 81 parallel to the straight line portion 44 of the embossed portion 4 and the lid center line N connecting both ends of the left and right oblique sides 81 and 81. And an orthogonal line portion 82 orthogonal to each other.

Next, the operation of the easy-open can lid for full-surface opening according to the present embodiment will be described.
When opening, a finger is put on the outer edge of the finger hooking portion 71 of the tab 7 and lifted upward, and the tab tip portion 74 is pushed by a lever action to break the score 2 initially. Since the finger hook part 71 is located on the upper side and the step recess 8 is further provided, the finger hooking property is good. After the initial break, the entire opening score is broken left and right from the initial break by lifting, but at that time the stress can be concentrated at the break point by the embossed part, and the score can be easily broken .

  On the other hand, since the embossed portion 4 having a size that can fit the finger rest portion 71 is provided in the can lid main body 5, when the can lid 1 is stacked, as shown in FIG. The outer periphery of the chuck wall portion 52 of the upper can lid is fitted and centered on the inner periphery of the chuck wall portion 52 of the lid. During transportation, the can lids rotate relative to each other, and the finger hook portion 71 protruding from the outer surface of the lower can lid fits in the recess 45 of the embossing portion 4 provided on the inner surface of the upper can lid. After the finger hook portion 71 is received in the recess 45, rattling between the can lids is restricted, and the can lid row is transported in a stable state. Defects such as deformation are eliminated, and high-speed production is possible. In particular, in this embodiment, it can be stored within a range of a predetermined angle θ on the left and right with respect to the center line N, and the finger catching portion 71 of the lower tab 7 is easily fitted.

In addition, when packing in a state of being stacked in a row, the number of lids that fall within the determined bag length is the same as a can lid that does not have a high finger hook, so that production efficiency is not reduced.
Compared with the conventional example, the height A2 when the upper and lower lids are symmetrically overlapped can be reduced by 0.5 mm as a design value. Assuming that the number of bags in a package at the time of shipment is 100, a lid length suppressing effect of 50 mm is obtained.

In the present embodiment, since the large-diameter arc portion 41 of the embossed portion 4 is enlarged to form a wide surface of the embossed portion 4, various decorations, Information can be displayed. But the embossing part 4 should just have the area which the finger hook part 71 fits.
In the above-described embodiment, the tab 7 has a finger hook portion 71 that is higher than the tab main body portion 72 with respect to the outer surface of the can lid main body. Although it can be stored in the embossed portion 4 of the can lid, it can also be applied to a can lid in which the finger hook portion 71 of the tab 7 is not higher than the tab main body portion 72.
FIG. 1D and FIG. 2D illustrate the overlapping state of the present invention and the conventional can lid when the finger hook portion has the same height as the tab main body portion.
That is, in the case of a conventional can lid, as shown in FIG. 2D, the embossed portion 103 has a convex shape on the inner surface side, so that even if the finger hook portion 107 ′ is not higher than the tab main body portion 108, the tab The main body part 108 interferes with the embossing part 103, and the overlapping height of the upper and lower can lids is increased by the thickness of the embossing part 103. On the other hand, in the case of the present invention, as shown in FIG. 1 (D), the embossed portion 4 is concave on the inner surface side and convex on the outer surface side, so that the tab main body portion 72 is embossed. It will contact the panel part 51 without interfering with the part 4, and the overlap height will be lower by the thickness of the embossed part 103 than the conventional example shown in FIG.
Moreover, in the said embodiment, although the case where the finger hook part 71 of the tab 7 was located in the rivet part 6 side with respect to the center O of the can lid main body 5 was demonstrated, the finger hook part 71 is located in the center of a can lid main body. On the other hand, the present invention can also be applied to the case where it is located on the opposite side of the rivet.

FIG. 1 shows an easy-open can lid for full-surface opening according to an embodiment of the present invention. FIG. 1 (A) is a plan view, and FIG. 1 (B) is an enlarged cross section of the can lid of FIG. 1 (A). The figure, (C) is a cross-sectional view showing the relationship between the embossed part of the upper can lid superimposed on the finger hook part, and FIG. (D) shows a tab whose finger hook part is not higher than the tab body. It is principal part sectional drawing which shows the overlapping state of the can lid | cover at the time of using. 2A and 2B show a conventional easy-open can lid for full-surface opening. FIG. 2A is a plan view, FIG. 2B is an enlarged cross-sectional view of the can lid of FIG. ) Is a cross-sectional view showing the relationship between the finger hook and the upper can lid, and FIG. (D) shows the can lid overlapping state when a tab whose finger hook is not higher than the tab body is used. It is principal part sectional drawing.

Explanation of symbols

1 Easy-opening can lid for full surface opening 2 Score for full surface opening 3 Opening planned part 4 Embossed part 41 Large arc part, 42 Central small arc part, 43 Left and right arc part, 44 Straight line part,
45 Recess 5 Can lid body 51 Panel portion, 52 Chuck wall portion, 53 Winding curl portion,
6 Rivet part 7 Tab 71, 71 'Finger hook part, 72 Tab body part, 73 Fixing part 74 Tab tip part, 75 Knob part, 76 Finger hole, 77 Side plate part 8 Step concave part 81 Oblique side part, 82 Orthogonal line part N Center Line R Rotating orbit projection area R1 Outer diameter line R1 Inner diameter line

Claims (4)

A can lid body formed with an embossed portion for enlarging the surface rigidity of the planned opening portion engraved with a score for opening the entire surface and surrounded by the score for opening the entire surface, and fixed to the can lid body via a rivet portion In the easy-open can lid for opening the entire surface with a tab for breaking the score,
The embossed portion is convex on the outer surface side and concave on the inner surface side, and when stacked, the tab on the lower can lid does not interfere with the embossed portion on the upper can lid. Easy-open can lid.   The finger hook portion of the tab is higher than the tab main body with respect to the outer surface of the can lid main body, and the tab finger hook portion can be stored in the embossed portion of the upper can lid when stacked. The easily openable can lid | cover for whole surface opening of Claim 1.   The embossed part assumes the rotation trajectory drawn by the finger hook when the tab is rotated around the center axis of the can lid body, and the rotation trajectory projection of the finger hook is projected on the can lid body. The easily openable can lid for full-scale opening according to claim 2, which is provided on the region. Lower tab can accommodated in the embossed part with the tab hooking part located on the rivet part side with respect to the center of the can lid body and the embossed part provided on the opposite side of the tab with respect to the center of the can lid body The finger tab portion of the tab of the lid is configured to be allowed to move in the rotational direction by a predetermined angle θ to the left and right with respect to a center line passing through the center of the rivet portion and the can lid body. Item 4. An easily openable can lid for opening the entire surface according to item 2 or 3.

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