JPH06219448A - Easy openable can lid - Google Patents

Abstract

PURPOSE:To obtain an easy openable can lid of a positive pressure drink can, wherein drink is not spouted in opening, and there is no possibility that a tab or a tearing flap is separated from a lid main body. CONSTITUTION:A main score portion 4 for demarcating an opening portion 3 wherein the part faced to an initial opening portion 4a is a falling portion 5 is formed on a panel portion 2 of a lid main body, and a first rivet 6 surrounded by a vent score portion 8 is formed on the radial direction to pass the initial opening portion 4a to the center side, moreover a second rivet 7 is formed on the peripheral edge. A tab 9 is composed of a rivet fixing portion 12 provided with a first tongue flap 10 and a second tongue flap 11, a peripheral-like strengthened part 13 and a tab portion 14. The first tongue flap 10 and the second tongue flap 11 are respectively fixed to the first rivet 6 and the second rivet 7. In the rivet fixing portion 12, a clearance 15 is formed along the second rivet 7 side peripheral edge of the first tongue portion 10, while a clearance or a weakened part is formed along the first rivet 6 side peripheral edge of the second tongue portion 11. A nose portion 13 of the tab is positioned just above the initial opening portion 4a, or on the outside in the radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbonated beverage can, a beer can, and a liquid nitrogen-filled juice can in which the tab and the tearing tongue do not separate from the lid body after the score tab is torn and opened by the tab. The present invention relates to a can lid which has an internal pressure higher than atmospheric pressure, such as a can of beverage, and which is suitable for canning a positive pressure beverage and the like and which can be easily opened.

[0002]

2. Description of the Related Art A can lid 100 of the type shown in FIGS. 18 and 19 has been proposed as an easily opened can lid in which a tab and a tearing tongue are difficult to separate from the lid body after opening (Japanese Patent Laid-Open No. 3-69451). Issue). In the figure, 101 is a lid main body, and 102 is a rack-shaped score portion that defines an opening. The score part 102 has two ends 102a, and a part between them is a missing part 105. 103
Is a ring-shaped tab and is fixed to the rivet 104 of the lid body 101 via the tongue-shaped portion 103a. The head end 102b of the score portion is relatively close to the peripheral rising portion (so-called chuck wall) 101a of the lid body,
The nose portion 103b of the knob tab 103 extends beyond the head end 102b of the score portion toward the chuck wall 101a.

At the time of opening, when a finger is inserted into the knob tab 103 and a portion on the left side of the rivet 104 in the drawing is pushed up, the nose portion 103b pushes down a portion of the lid main body immediately thereunder, and at the same time, the rivet 104 is pulled up. Therefore, a shearing force acts on the head end 102b of the score portion, and the head end 102a and the vicinity thereof are broken to perform the initial opening. Subsequently, when the knob tab 103 is pulled up toward the left side of the drawing, the score portion 102 is torn, and a tearing tongue piece (not shown) is formed. Both ends 1 of the score part 102
Since there is a missing portion 105 between 02a, the tearing tongue is connected to the lid body 101 via the missing portion 105 even after the opening is completed, that is, the tearing tongue does not separate from the lid body 101. .

The can lid 100 having an easy opening as described above has the following problems. A positive pressure beverage such as a cola beverage is filled leaving a headspace (see 16 in FIG. 3), and the thumb is inserted into the tab 103 to open the beverage can which is sealed with the can lid 100. When the can is pulled up, the can tilts so that the head end 102b of the score part faces downward, but since the head end 102a is relatively close to the chuck wall 101a, even if the tilting is slight, the beverage will not reach the bottom surface of the head end 102b. Contact. Therefore, the beverage to which the internal pressure is applied is likely to spout from the initial opening portion, which easily causes troubles such as soiling clothes and body.

[0005]

DISCLOSURE OF THE INVENTION The present invention, when used as a can lid for a can of canned food filled with a positive pressure beverage, does not have a risk of spouting the content of the beverage even when the can is slightly tilted at the time of opening, and further, the picking is performed. An object of the present invention is to provide a can lid with an easy opening in which the tab and the tearing tongue are not likely to come off from the lid body.

[0006]

According to the present invention, an easily opened can lid has an easily opened can lid in which a grip tab is fixed to a panel portion of a lid body, and the panel portion has a portion facing the initial opening portion. A horseshoe-shaped main score portion that defines an opening that becomes a mouthpiece or the like that has become a missing portion, and a first rivet that is surrounded by a vent score portion on the side toward the center on the radial direction that passes through the initial opening portion, And a second rivet is formed on the peripheral side, and the tab is provided with a first tab and a second tab.
A rivet fixing portion having a tongue piece, a circumferential reinforcing portion surrounding the rivet fixing portion, and a knob portion, and the first tongue piece and the second tongue piece are fixed to the first rivet and the second rivet, respectively. The rivet fixing part has a first
A tongue having a void formed along the second rivet-side peripheral edge thereof, and a void or a weakened portion formed along the first rivet-side peripheral edge of the second tongue. And The nose portion of the tab may be located directly above the initial opening of the main score portion, or may be located radially outward of the initial opening of the main score portion.

[0007]

The operation will be described with reference to the can lid 1 shown in FIGS. 3 to 8 which is an embodiment. When the fingers are inserted into the knob 14 of the knob tab 9 and pulled up, first, the panel portion 2 in the vicinity of the first rivet 6 will be described.
The first rivet 6 is lifted up with the portion (Fig. 3). When the knob 14 is further pulled up, the force applied from the knob tab 9 to the vent score 8 is caused by the gap 15 at the periphery of the first tongue 10 and thus the first tongue 1
The base portion 10a of 0 is selectively lifted. As a result, the stress is efficiently concentrated on the portion 8a of the bent / score portion 8 on the side of the knob 14 and the reaction force by the panel portion 2 causes the portion 8a of the score portion 8 to be cut first, and then the score portion 8 The cutting proceeds to the portion 8b on the second rivet 7 side. That is, the vent hole 23 is formed at the position where degassing is performed.
Therefore, when it is used as a can lid of a canned product filled with a positive pressure beverage, even if the can is slightly tilted at the time of opening, there is no risk of the content beverage spouting.

Since the portion facing the initial opening 4a of the horseshoe-shaped main score portion 4 demarcating the opening 3 serving as a drinking mouth is the missing portion 5, the tearing tongue piece 17 is opened even after the complete opening.
Are connected to the panel section 2 by the missing section 5. Therefore, even after the opening, there is no possibility that the tab and the tearing tongue will be separated from the lid body. The void portion 15 is provided with the rivet fixing portion 12 when the nose portion 13a of the knob tab 9 pushes the initial opening portion 4a and when the tearing tongue piece 17 is pulled up after the pushing operation.
It is possible to pull up by eliminating the resistance caused by. Weakened part 2
Since 6 is also easily cut at the time of initial pulling up, it has the same function as the void. When the nose portion 13a of the pick tab is located right above the initial opening portion 4a of the main score portion like the can lid 1, bring the initial opening portion 4a close to the double winding portion 19 of the canned food 22. Since it is easy, it is easy to drink the beverage directly by putting the mouth on the opening 3.

When the nose portion 13a is located radially outward of the initial opening portion 4a (FIGS. 11 and 12), the initial opening does not push the initial opening portion 4a and leverages the initial opening portion. It is performed by pulling up (see FIG. 16). Therefore, the initial opening and the subsequent tearing opening until the tearing tongue piece 17 reaches the maximum width are easier than in the can lid 1 of FIG. 1, so that the opening as a whole is performed more smoothly.

[0010]

EXAMPLE An example in which the nose portion of the knob tab is located directly above the initial opening portion of the main score portion (claim 2) will be described with reference to FIGS. In FIGS. 1 and 2, 1 is a can lid that can be easily opened, and 2 is a panel portion of the lid body. The panel portion 2 is formed with a main score portion 4 that defines an opening portion 3 (see FIG. 7) that becomes a drinking mouth or the like when used. The main score part 4 includes a semi-circular part 4b on the peripheral side of the panel part 2 and a wedge-shaped part 4 having a narrower interval toward the center side.
c, a small semicircular portion 4d curved outward from the end 4c 'of the wedge-shaped portion having the narrowest width, forming a horseshoe shape. A portion between the narrowest ends 4c 'facing the initial opening 4a, which is the portion closest to the peripheral edge of the panel portion 2, is the missing portion 5.

A first rivet and a second rivet for fixing the knob tab 9 are respectively fixed to the panel portion 2 on the radial center side passing through the initial opening 4a. And the second rivet 7 is formed on the peripheral side. Close to the root of the first rivet 6,
A circular Vent score portion 8 is formed.

The knob tab 9 includes a first tongue piece 10 and a second tongue piece 10.
The rivet fixing portion 12 including the tongue piece 11, the circumferential reinforcing portion 13 surrounding the rivet fixing portion 12, and the ring-shaped picking portion 14. The circumferential reinforcing portion 13 has a structure having a relatively large section modulus such as a tubular section or a U-shaped section, and has a rigidity such that it is not substantially bent by a force applied to the opening. The first tongue piece 10 and the second tongue piece 11 are located on the first rivet 6 and the second rivet, respectively, and the nose portion 13a of the tab 9 is located directly above the initial opening 4a of the main score portion 9. It is fixed so that
The outer portion of the first tongue piece 10 and the second tongue piece 11 in the rivet fixing portion 12 is a cutout portion, that is, a void portion 15.

The opening of the can 20 filled with the beverage 21 leaving the head space 16 and the can 22 (FIG. 3) formed by double-tightening the can lid 1 is performed as follows. When the knob 14 of the knob tab 9 is pulled up by fingers, first, the first rivet 6 is lifted together with the portion of the panel portion 2 near the first rivet 6 (FIG. 3). When the knob 14 is further pulled up, the first force is generated due to the reaction force of the panel 2.
The Vent score portion 8 surrounding the rivet 6 is broken, and the Vent hole 23 is formed to degas (FIG. 4).

A space 15 is formed outside the first tongue piece 10, and the circumferential reinforcing portion 13 has such a rigidity that it is not substantially bent by the reaction force. 6 easily separates from the panel part 2 together with the first tongue piece 10. At the same time, since the outer side of the second tongue piece 11 is the void portion 15, the knob tab 9 is not restricted by the rivet fixing portion 12 and is easily tilted with the base portion 11a of the second tongue piece 11 as a fulcrum. Then, the nose portion 13a comes into contact with the initial opening portion 4a of the main score portion 4 (FIG. 4). When the grip portion 14 is further pulled up, the nose portion 13a pushes off the initial opening portion 4a to perform the initial opening (FIG. 5). Further, the knob tab 9 is pulled up until the semicircular shaped portion 4b of the main score portion 4 is torn all the way (close to 90 degrees) (FIG. 6).
Thereafter, the tab 9 is pulled back in the direction of the arrow, and the wedge-shaped portion 4c of the main score portion 4 is torn to the end 4c 'thereof to open the entire surface to form the opening 3 (FIGS. 7 and 8). The tearing tongue piece 17 after opening is connected to the panel portion 2 at the missing portion 5.

As in a can lid 1'shown in FIG. 9, U along the peripheral edges of the first tongue piece 10 and the second tongue piece 11 respectively.
You may form the void part which consists of character-shaped cutout parts 24 and 25. Further, like the can lid 1 ″ shown in FIG. 10, the outer portion of the cutout portion 24 of the rivet fixing portion 12 is made of one metal plate like the first tongue piece 10, and the second rivet 7 A weakened portion 26 such as a sinusoidal score portion may be formed along the peripheral portion on the side of the first rivet 6. In this case, FIG.
At the stage shown in (1), the weakened portion 26 is cut, and thereafter, opening is performed in the same manner as in the case of the can lid 1. In this specification,
If the weakened portion 26 is formed, the second
The portion of the rivet fixing portion 13 on the rivet 7 side is referred to as a second tongue piece.

FIG. 11 showing an embodiment in which the nose portion is located radially outside the initial opening (claim 3).
The can lid 31 shown in FIG. 12 will be described below. Figure 1,
Portions with the same symbols as in FIG. 2 indicate similar portions. The structure of the can lid 31 is basically the same except that the nose portion 13a of the knob tab 9 has a circular cross section and is located radially outside the initial opening 4a of the main score portion 4. The same as the can lid 1.

The opening of a can body 20 filled with the beverage 21 leaving the head space 16 and a canned product 22 (FIG. 13) formed by double-tightening the can lid 31 is performed as follows. When the knob 14 of the knob tab 9 is pulled up by fingers, first, the first rivet 6 is lifted together with the portion of the panel portion 2 near the first rivet 6 (FIG. 13). When the picking portion 14 is further pulled up, like the case of the can lid 1,
Due to the reaction force of the panel portion 2, the Vent score portion 8 surrounding the first rivet 6 is broken, and the vent hole 23 is generated to perform degassing, and the first rivet 6 is attached to the first tongue piece 10. At the same time, it easily separates from the panel section 2. At the same time, the knob tab 9 easily tilts with the base 11a of the second tongue piece 11 as a fulcrum, and the nose portion 13a approaches the portion 2a of the panel portion radially outside the initial opening 4a of the main score portion 4 ( (Fig. 14).

When the pick portion 14 is further pulled up, the nose portion 13a contacts the portion 2a and presses the portion 2a (see FIG. 1).
5). When the pick-up portion 14 is further pulled up, the lever opening action pushes up the initial opening 4a together with the second rivet 7 to perform the initial opening of the main score portion 4 (FIG. 1).
6). Next, the pick tab 9 is pulled up and pulled back toward the central portion of the can lid 31 to tear the main score portion 4 to advance the opening (FIG. 17). Finally, similar to the case of the can lid 1, the knob tab 9 is pulled until it is close to the panel portion 2 (see FIG. 8), so that the entire opening is smoothly performed.

[0019]

INDUSTRIAL APPLICABILITY When the can lid of the present invention which is easy to open is used as a can lid of a can filled with a positive pressure beverage, at the time of opening, there is no possibility that the contents beverage will spout even if the can is slightly tilted. Moreover, there is an effect that there is no fear that the tab and the tearing tongue will come off from the lid body. The can lid according to the second aspect has an advantage that it is easy to directly drink the beverage by applying the mouth to the opening. The can lid according to claim 3 has an advantage that the tear opening of the main score portion by the pick tab is smoothly performed as a whole.

[Brief description of drawings]

FIG. 1 is a plan view of a can lid that is an easy-to-open according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is a longitudinal cross-sectional view of an essential part showing a state immediately after pulling up a knob of the can lid of FIG. 1, which is a canned lid.

FIG. 4 is a longitudinal sectional view of an essential part showing a state immediately after the knob portion of FIG. 3 is further pulled up and the vent score portion is broken.

5 is a longitudinal cross-sectional view of relevant parts showing a state where the knob of FIG. 3 is further pulled up to start an initial opening.

FIG. 6 is a longitudinal cross-sectional view of a main portion showing a state where the knob of FIG. 3 is pulled up until the semicircular portion near the initial opening of the main score portion is cut.

7 is a longitudinal cross-sectional view of a main portion showing a state in which a grip portion of the can lid of FIG. 3 is pulled up, the main score portion is torn over the entire length, and an opening is formed.

FIG. 8: until the knob tab of FIG. 7 is nearly parallel to the can lid,
It is a principal part longitudinal cross-sectional view which shows the state which bent the tearing tongue piece.

FIG. 9 is a plan view of a can lid which is a second embodiment of the present invention and whose opening is easy.

FIG. 10 is a plan view of a can lid that is easy to open according to a third embodiment of the present invention.

FIG. 11 is a plan view of a can lid that is easy to open according to a fourth embodiment of the present invention.

12 is a vertical cross-sectional view taken along the line XII-XII in FIG.

13 is a longitudinal cross-sectional view of an essential part showing a state immediately after pulling up the knob part of the can lid of FIG. 11, which is a canned lid.

FIG. 14 is a longitudinal sectional view of an essential part showing a state immediately after the knob portion of FIG. 11 is further pulled up and the vent score portion is broken.

FIG. 15 is a longitudinal sectional view of an essential part showing a state in which the knob portion of FIG. 11 is further pulled up and the nose portion is pressing the panel portion outside the initial opening.

16 is a longitudinal cross-sectional view of relevant parts showing a state where the knob of FIG. 11 is further pulled up to start the initial opening.

FIG. 17 is a longitudinal cross-sectional view of a main portion showing a state where the knob portion of FIG. 11 is pulled back and an opening due to tearing of the main score portion is progressing.

FIG. 18 is a plan view of a can lid which is a comparative example.

FIG. 19 is an enlarged vertical sectional view taken along the line XVIIII-XVIIII in FIG.

[Explanation of symbols]

 1 Can lid that can be easily opened 1'Can lid that can be easily opened 1 ”Can lid that can be easily opened 2 Panel part 3 Opening part 4 Main score part 4a Initial opening part 5 Missing part 6 First rivet 7 Second rivet 8 Vent Score part 9 Knob tab 10 First tongue piece 11 Second tongue piece 12 Rivet fixing part 13 Circumferential strengthening part 13a Nose part 14 Knob part 15 Void part 24 Cutout part (void part) 25 Cutout part (void part) 26 Weakened part 31 Can lid with easy opening

Front page continuation (72) Inventor Masasuke Tanaka 2-206, Nishitobe-cho, Nishi-ku, Yokohama-shi, Kanagawa (72) Hisao Iwamoto 3-1-1, Sugita Tsubo, Isogo-ku, Yokohama, Kanagawa

Claims (3)

[Claims] 1. A can lid in which a knob tab is fixed to a panel portion of a lid body and which has an easy opening, and an opening portion which defines a missing portion in a portion facing the initial opening portion is defined in the panel portion. A horseshoe-shaped main score portion, and a first rivet surrounded by a Vent score portion on the central side on the radial direction passing through the initial opening, and a second rivet on the peripheral side, The tab has a rivet fixing part including a first tongue and a second tongue, a circumferential reinforcing part surrounding the rivet fixing part, and a picking part, and the first tongue and the second tongue respectively. , The first rivet and the second rivet, and the rivet fixing portion has a space along the second rivet-side peripheral edge of the first tongue piece, and the second tongue. Gap along the first rivet side edge of the piece Or wherein the weakened portion is formed opened easily can lid. 2. The easily opened can lid according to claim 1, wherein the nose portion of the knob tab is located right above the initial opening portion of the main score portion. 3. The easily opened can lid according to claim 1, wherein the nose portion of the knob tab is located radially outward of the initial opening portion of the main score portion.