JP4187144B2 - Easy opening can lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an easy-to-open can lid that is fastened and secured to a can body as an end wall on the top plate side of a can container, and in particular, an opening piece is partially formed on a substantially disk-shaped panel portion. The present invention relates to an easy-to-open can lid of the Steion tab type, which is a partial open type easy-to-open can lid that is opened by pushing the opening piece into the can while being connected to the panel portion by operating the tab.
[0002]
[Prior art]
In the can container for beverage cans, an almost disk-like panel part of the can lid is fully opened as an easy-to-open can lid (easy open end) that is fastened to the can body as an end wall on the top plate side. Instead of the full-open type, a partial open type easy-to-open can lid is generally used in which a part of the panel portion of the can lid is partially opened as a drinking mouth. As such a partial open type easy opening lid for beverage cans, in the past, a pull top tab type can lid that completely separates the tab and the opening piece from the panel portion of the can lid by the operation of the tab is often used. However, the tabs and opening pieces separated from the cans were inadvertently discarded, causing problems in terms of resource recovery and environmental beautification. Steion tab type can lids are often used in which the opening piece is pushed down into the can without opening the tab or opening piece from the can.
[0003]
With respect to such an easy opening lid of the steion tab method, for example, forming a concave portion below the pushed-down end of the tab within the region of the opening piece surrounded by the score line is disclosed in, for example, Japanese Patent Laid-Open No. 4-201852. Japanese Patent Laid-Open No. 6-156488, etc., on the other hand, forming a protrusion below the push-down end of the tab in the region of the opening piece surrounded by the score line is, for example, It has been publicly known from Japanese Patent Publication No. 59-24939, Japanese Utility Model Publication No. 5-2446.
[0004]
[Problems to be solved by the invention]
By the way, in the easy opening can lid of the steion tab method, when the tab holding portion is started to be lifted by forming a recess below the tab pressing end in the region of the opening piece, the tab pressing end is Since there is play before it comes into contact with the opening piece, the tab holding portion can be easily raised. On the other hand, by forming a protrusion below the tab's push-down end in the region of the opening piece, the portion of the opening piece that abuts the tab's push-down end can be reinforced (increase the rigidity). In addition, it is possible to efficiently transmit to a required portion without bending or deforming the contact portion of the opening piece with the tab, and the score line can be effectively broken by the lever action.
[0005]
Therefore, in performing the lifting operation of the tab gripping portion, each of the above-described conventionally known ones can be performed so that the tab gripping portion can be easily raised and the lever action by the tab can be efficiently transmitted to the required portion. When the technologies are simply gathered (in Japanese Patent Publication No. 59-24939, a configuration is disclosed in which a recess is formed in the opening piece and a projection is formed in the recess), the top of the projection is a tab. The gap below the lower end of the tab becomes narrower and the effect of giving play to the tab due to the concave portion is reduced. On the other hand, the gap below the lower end of the tab is reduced. If the height of the protrusion is lowered to increase the height, the effect of reinforcing the opening piece by the protrusion (increasing the rigidity of the contact portion with the tab) is reduced. It would become a thing it is difficult to satisfy the results.
[0006]
An object of the present invention is to solve the above-described problems. Specifically, in a steion tab type easy opening can lid, even if a protrusion is formed in a recess formed in an opening piece. The tab can be easily raised by play by the recess without being disturbed by the protrusion, and the protrusion has a sufficient reinforcing effect so that the lever action by the tab can be efficiently applied to the required portion. It is an object to be able to transmit the score line so that the score line can be effectively broken.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a partial disk-shaped panel portion in which an opening piece surrounded by a score line leaves a gap between both ends of the score line as a hinge portion. The tab for pushing down the opening piece is fixed to the outside of the opening piece at the approximate center of the panel portion with a rivet, and one end side that becomes the grip portion of the tab is the opening piece with the rivet sandwiched between them. In the easy-to-open can lid, which is located on the opposite side and the other end side of the tab pressed-down end is located above the opening piece, a recess is formed in the area of the opening piece including the vicinity below the pressing-down end of the tab. The protrusion having the inclined side surface is positioned so that its apex is disengaged radially outward from the tab of the can lid , and the inclined side surface of the protrusion is positioned at a predetermined interval below the depressed end of the tab. near the top edge of the bottom surface of the recess of the opening piece Formed to protrude upwardly to a height, when depressing the end pushed down by lifting the grip portion of the tab, at below the upper edge of the recess of the opening piece, to the end depression of the tab into contact with the inclined side surface of the projection It is configured as described above.
[0008]
According to the configuration as described above, the inclined side surface of the protrusion is positioned below the push-down end of the tab, so that even if the protrusion protrudes to a predetermined height, the protrusion of the protrusion is below the push-down end of the tab. A sufficient space (play) can be provided between the inclined side surface and the tab gripping portion can be easily raised, and the protrusion is projected to a predetermined height to reinforce the opening piece by the protrusion. The effect (stiffness of the portion in contact with the tab) can be ensured, and the score line can be effectively broken by efficiently transmitting the lifting force and the pressing force by the tab to the required portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the easy-open can lid of the present invention will be described in detail with reference to the drawings. In addition, about one Embodiment of the easy opening lid | cover of this invention, FIG. 1 shows the state of the whole can lid | cover (before being clamped and fixed to a can body) from the upper direction, FIG. 2 shows (A). The upper surface of the can lid excluding the tab and (B) the lower surface (back surface) of the tab are shown, respectively. FIG. 3 shows the cross-sectional shape of the can lid and a partially enlarged state of the cross-sectional shape. (A) The state before opening operation, (B) The state when the tab gripping part is raised, and (C) The tab gripping part is further lifted and the score line is initially broken to start pushing down the opening piece. Each time state is shown.
[0010]
In the can lid 1 of the present embodiment, as shown in FIG. 1, the main body portion in which the rivet 2, the panel portion 3, the counter sink portion 4, and the flange portion 5 are integrally formed by pressing is separated from the main body portion. A tab 6 for opening operation formed in is attached by a rivet 2 at substantially the center of the substantially disc-shaped panel portion 3. Although not shown, an organic polymer sealing agent is applied and adhered to the back surface side of the flange portion 5 which is a portion to be fastened to the can body.
[0011]
As shown in FIG. 2 (A), the substantially disc-shaped panel portion 3 of the can lid 1 has a score line 11 (open aperture) continuous from the start end 11a to the end end 11b along the shape of the opening. The outer sub-score line that is not broken is provided in a double line state with respect to the outer main score line 11 that is sometimes broken, and the score line 11 (the main score line that breaks when opened) ) Is a portion of the opening piece 12 that is pushed down into the can at the time of opening, and between the both ends 11a and 11b of the score line 11 is a hinge that connects the panel portion 3 and the opening piece 12 at the time of opening. Part 13 is formed.
[0012]
In contrast to the opening piece 12 that is partially formed in the panel portion 3 so as to leave the space between both ends 11a and 11b of the score line 11 as the hinge portion 13, as shown in FIG. The tab 6 for pushing down is positioned on the opposite side of the opening piece 12 with the rivet 2 sandwiched between one end side thereof as a gripping portion 6a and positioned above the opening piece 12 with the other end side as a pushing down end 6b. The rivet 2 is fixed outside the area of the opening piece 12 and is located substantially in the center of the panel portion 3.
[0013]
As for the specific structure of the tab 6, as shown in FIG. 2B, the outer peripheral edge portion 61 is bent to the lower surface side, and the opening edge portion 62 of the grip portion 6a is also bent to the lower surface side. However, these portions have extremely high rigidity, whereas the portion 63 in the vicinity of the fixing portion by the rivet 2 is easily deformed by only one metal plate. It should be noted that the push-down end 6b of the tab 6 is preliminarily provided in a portion on the lower surface side of the tab so that the metal material can be absorbed from the lower surface side when the arc-shaped portion of the outer peripheral edge is bent to the lower surface side. A notch portion 64 is formed, and the width of the notch portion 64 is narrowed to such an extent that the notch portion 64 is almost connected by bending to the lower surface side of the outer peripheral edge.
[0014]
In the can lid 1 in which such a tab 6 is fixed by the rivet 2, the opening piece 12 partially formed in the panel portion 3 has a relatively lower portion so as to include the vicinity of the lower end 6 b of the tab 6. A concave portion 21 having a wide bottom area is formed, and a conical protrusion 22 having an inclined side surface is formed so as to protrude upward from the bottom surface of the concave portion 21 to a height near the upper edge. When viewed from the top, the tab 6 (pressing end 6b) overlaps with a part of the protrusion 22, but the apex of the protrusion 22 is located away from the tab 6 (pressing end 6b) outward in the radial direction of the can lid. ing.
[0015]
That is, as shown in FIG. 3, the inclined side surface 22a of the protrusion 22 is positioned at a predetermined interval (with play) below the push-down end 6b of the tab 6, thereby opening operation. When the gripping portion 6a of the tab 6 is lifted to start pushing down the push-down end 6b, the push-down end 6b of the tab 6 is below the upper edge of the recess 21 of the opening piece 12 and the inclined side surface 22a of the projection 22 It comes to contact with.
[0016]
In this embodiment, the recess 21 formed in the opening piece 12 is formed so as to occupy more than half of the area of the opening piece 12, thereby improving the rigidity of the opening piece 12 as a whole. ing. As for the area of the panel portion 3 excluding the area of the opening piece 12, as shown in FIG. 2A, the inclined wall portion 31 for increasing the overall rigidity of the panel portion 3 and the grip portion of the tab 6. Protrusions 32 for supporting 6a from below, concave grooves 33 for increasing the rigidity of the panel 3 around the rivet 2, and the like are formed.
[0017]
The can lid 1 of the present embodiment having the above-described structure is configured such that the flange portion 5 is connected to the upper end opening edge of the can body with respect to the can body (can body) whose upper end is opened after the contents are filled. The operation state at the time of opening operation of the can lid 1 which becomes the upper end wall of the can container and becomes the upper end wall of the can container is as described below.
[0018]
When starting the opening operation, if the finger 6 is placed on the grip 6a of the tab 6 and lifted from the state shown in FIG. 4A, the outer peripheral edge of the tab 6 and the grip 6 have high rigidity. In addition, since the deformation in the vicinity of the rivet 2 is easy, the lifting force acts so as to push down the push-down end 6b of the tab 6 with the rivet 2 as a fulcrum. As shown in the figure, a predetermined interval (play) is provided below the push-down end 6b of the tab 6 between the inclined side surface 22a of the projection 22 of the opening piece 12, and therefore the push-down end 6b of the tab 6 is Until the contact with the inclined side surface 22a of the protrusion 22, as shown in FIG. 4B, the grip 6a of the tab 6 can be lifted with little force without resistance, and a finger is put on the grip 6a of the tab 6. Can be easily hung.
[0019]
As shown in FIG. 4 (C), the tab 6 is placed on the gripping portion 6a of the tab 6 so that the pushed-down end 6b of the tab 6 is in contact with the inclined side surface 22a of the protrusion 22. By further lifting the gripping portion 6a, the second kind of lever action is activated, and the pulling force of the tab 6 (gripping portion 6a) with the contact point between the pushed-down end 6b of the tab 6 and the inclined side surface 22a as a fulcrum is This acts as a force for pulling up the rivet 2 through the vicinity 63 of the fixed portion by the rivet 2. At this time, since the contact point of the opening piece 12 serves as a fulcrum for the pulling force to the rivet 2 by the tab 6, a force that can be pushed downward acts on the opening piece 12, and the pressing by the tab 6 is pushed down. The force acts intensively on the contact point (inclined side surface 22a of the protrusion 22) which is a part of the opening piece 12, but since this part is formed on the highly rigid protrusion 22, this part is bent downward. Since it is not deformed or deformed, the lever action by the tab 6 acts efficiently.
[0020]
As the rivet 2 receives the pulling force in this way, an initial breakage occurs in the score line 11 in the vicinity of the rivet 2 as shown in FIG. After that, although not shown in the figure, by further lifting the gripping portion 6a of the tab 6, the first type of lever action works, and the pressing force of the tab 6 (pressing end 6b) with the rivet 2 as a fulcrum is a rigid force. By efficiently acting on the opening piece 12 through the high protrusion 22, the score line 11 is broken from the start end 11 a toward the end end 11 b, and at the same time, the opening piece 12 is gradually canned by the pushed-down end 6 b of the tab 6. When the score line 11 is broken down to the terminal end 11b, the opening piece 12 and the panel part 3 are connected with the portion between the starting end 11a and the terminal end 11b of the score line 11 as a hinge part 13, The entire opening piece 12 is pushed down into the can, and the opening of the can lid 1 is completed.
[0021]
According to the easy opening can lid of the present embodiment as described above, the recess 21 is formed in the opening piece 12, the conical protrusion 22 is formed to protrude from the bottom surface of the recess 21, and the push-down end 6 b of the tab 6 is pressed. Since the inclined side surface 22a of the protrusion 22 is positioned below the protrusion 6, even if the protrusion 22 protrudes to the vicinity of the height of the upper edge of the recess 21, as shown in FIG. A sufficient space (play) can be provided below the inclined side surface 22a of the protrusion 22, and when the opening operation is started, as shown in FIG. Can be easily woken up.
[0022]
Further, by projecting the protrusion 22 to the vicinity of the height of the upper end edge of the recess 21, the portion of the opening piece 12 (inclined side surface 22 a) that comes into contact with the pushed-down end 6 b of the tab 6 is sufficiently reinforced by the protrusion 22 ( 4 (C), even if the pressing force by the pressing end 6b of the tab 6 is concentrated on a part of the opening piece 12 (the inclined side surface 22a), Can be efficiently transmitted to the rivet 2 and the opening piece 12 without causing the lever to bend or deform downward, and the score line 11 can be effectively broken. it can.
[0023]
In addition, in this embodiment, since the recessed part 21 is formed so that it may occupy half or more of the area | region area of the opening piece 12, the whole recessed part 21 is reinforced (a rigidity is improved), Therefore After filling the contents in the can body) and sealing with the can lid 1, the opening piece 12 can be maintained in a flat state even when the inside of the can container has a negative pressure (negative pressure). . Further, when the opening piece 12 is pushed down into the can while the score line 11 is broken by the operation of the tab 6, the opening piece 12 can be kept flat without being bent, so that the opening piece 12 is pushed down efficiently. be able to.
[0024]
As mentioned above, although one embodiment of the easy opening can lid of the present invention was described, the present invention is not limited to the specific structure shown in the above embodiment, and the design can be appropriately changed. For example, with respect to the shape of the protrusion formed in the recess of the opening piece, sufficient play can be provided between the inclined side surface and the tab (pressing end), and the pressing force of the opening piece can be reduced. As long as the acting part can be sufficiently reinforced, the shape is not limited to the conical shape shown in the embodiment, and may be a pyramid shape such as a triangular pyramid or a quadrangular pyramid. Compared to the conical shape with the tab, the pushed-down end of the tab can be brought into contact with the flat inclined side surface, so even when the tab is rotated around the rivet during the tab lifting operation, , Tab down It can be contacted to ensure sloped side edges.
[0025]
【The invention's effect】
According to the easy opening can lid of the present invention as described above, sufficient play can be provided between the opening piece and the lower end of the tab, and resistance can be reduced when starting the opening operation. The tab gripping part can be raised with little force, and the part of the opening piece where the pressing force by the pressing end of the tab concentrates can be sufficiently reinforced by the formation of the protrusion, and the lifting force by the tab Further, the pressing force can be efficiently transmitted to the required portion, and the score line formed so as to surround the opening piece can be effectively broken.
[Brief description of the drawings]
FIG. 1 is a top view showing a can lid before being fastened and fastened to a can body according to an embodiment of the easy-to-open can lid of the present invention.
2A is a top view showing the main body portion of the can lid with the tab removed, and FIG. 2B is a bottom view showing the bottom surface (back surface) side of the tab.
3 is an overall cross-sectional view of the can lid shown in FIG. 1 passing through the center of the can lid along the direction from the holding portion of the tab to the push-down end, and a partially enlarged cross-sectional view showing a part thereof enlarged.
4 shows the tab and opening piece of the can lid shown in FIG. 1, (A) the state before opening operation, (B) the state when the tab gripping part is raised, and (C) the tab gripping further. Cross-sectional explanatory drawing which respectively shows the state when it begins to push down an opening piece by lifting a part and breaking a score line initially.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Can lid 2 Rivet 3 Panel part 6 Tab 6a (Tab) holding part 6b (Tab) pushing-down end 11 Score line 12 Opening piece 13 Hinge part 21 Recess 22 (Opening piece) Protrusion 22a (Protrusion) Of) inclined side

Claims (2)

The opening piece surrounded by the score line is partially formed on the substantially disk-shaped panel portion so that the space between the both ends of the score line is left as a hinge portion, and a tab for pushing down the opening piece, It is fixed to the outside of the area of the opening piece by a rivet at the approximate center of the panel part, and one end side that becomes the grip part of the tab is located on the opposite side of the opening piece across the rivet, and the other end side that becomes the push-down end of the tab is In the easy-to-open can lid positioned above the opening piece, a recess is formed in the area of the opening piece including the vicinity of the lower end of the tab, and a protrusion having an inclined side surface has a vertex from the tab. From the bottom of the recess of the opening piece to the height near the top edge so that the can lid is located radially outward and is located below the tab's push-down end with a predetermined gap at the inclined side of the projection It is formed to protrude upward The opening is configured such that when the tab holding portion is lifted and the pushing-down end is pushed down, the pushing-down end of the tab is in contact with the inclined side surface of the projection below the upper edge of the recess of the opening piece. Easy can lid. The easy-to-open can lid according to claim 1, wherein the concave portion formed in the opening piece occupies half or more of the area of the opening piece.

Images