JP2015071436A - Can-top - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can-top which prevents deformation of an opening piece into an unopenable state when sliding occurs between a tab and the opening piece at the time of opening while ensuring performance for internal pressure of a can container.SOLUTION: A can-top comprises a rivet 5 formed in a center O of a panel part 2; an opening piece 8 formed by being partitioned by a score line 7; a tab 10 having a push-down part 12 at one end portion, which is disposed to face the opening piece 8 in a vertical direction, and mounted to the rivet 5; a finger hook part 11 provided on a side opposite to the push-down part 12 side of the tab 10. By lifting the finger hook part 11 upward, the push-down part 12 is brought into contact with the opening piece 8 and presses down the opening piece 8 so as to break the score line 7 and open the opening piece 8. The push-down part 12 comprises an antislip part 15 having an irregular surface, at a part in contact with the opening piece 8.

Description

  The present invention relates to a can lid for forming an opening of a can container, and more particularly to a steion tab type can lid.

  2. Description of the Related Art Conventionally, a steion tab type can lid is known which includes a tab fixed to a can lid so as to be able to be opened and an opening piece defined by a score line. In the can container provided with the can lid, when the end of the tab opened by the opener presses the opening piece downward to open the can container, before the score line is broken across the entire area. There is a possibility that a contact portion between the tab and the opening piece starts to slide, and a phenomenon in which the opening piece cannot be broken any more, a so-called idling phenomenon may occur. For this reason, various can lids have been developed in order to prevent the occurrence of an empty swing when the can container is opened.

  For example, Patent Document 1 discloses a can lid provided with a lattice groove for providing contact resistance in a region of an opening piece where a tip portion of an opened tab comes into contact. The lattice grooves are formed, for example, by oblique grooves provided in a lattice shape, or by groove intervals in which the direction of contact resistance is given a direction.

Japanese Patent Application Laid-Open No. 2000-211162

  However, in the configuration described in Patent Document 1, a weakened portion is formed on the surface of the can lid due to the formation of the lattice grooves on the surface of the opening piece, and the bulge pressure performance of the can lid is reduced. There is a fear. That is, when the can container is a positive pressure can whose internal pressure is higher than atmospheric pressure, the rivet area of the can lid is more likely to bulge out, so that the tab of the can lid protrudes from the upper end of the can. There is an increased risk of failure. Further, although the surface shape of the can lid is linear when the internal pressure of the can container is atmospheric pressure, when the negative pressure can is lower than the atmospheric pressure, the can lid is deformed so as to bend inward of the can container. Therefore, there is a possibility that the anti-slip effect for preventing idling will be reduced, for example, the surface shape changes to a curved shape and the groove width of the lattice groove becomes narrow.

  The present invention has been made paying attention to the technical problem described above, and while ensuring the performance against the internal pressure of the can container, slipping occurs between the tab and the opening piece at the time of opening, and the air swing occurs. It aims at providing the can lid which prevents this.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a rivet formed to project from the center of the upper surface of the panel part, an opening piece formed by being partitioned by the score line on the panel part, A tab attached to the rivet having a push-down portion disposed so as to face the opening piece in the vertical direction, and a finger hook portion provided on the other end of the tab opposite to the push-down portion side And the push-down portion abuts on the opening piece and presses the opening piece downward to break the score line and open the opening piece. In the can lid configured as described above, the push-down portion is provided with a non-slip portion having an uneven surface formed at a portion in contact with the opening piece.

  According to a second aspect of the present invention, in the first aspect of the invention, the push-down portion includes a corner portion having a curved longitudinal section at a portion facing the opening piece, and the anti-slip portion is provided on a surface of the corner portion. A can lid characterized by being formed.

  A third aspect of the present invention is the can lid according to the first or second aspect, wherein the anti-slip portion is a groove formed so as to extend in a direction along the outer peripheral edge of the push-down portion. is there.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the tab is formed in a substantially rectangular shape, and the push-down portion constitutes one end portion in the longitudinal direction of the tab and is substantially The portion formed in an arc shape has a tip portion in the longitudinal direction, and the anti-slip portion is a straight line connecting the tip portion of the push-down portion and the center of the rivet among the push-down portions. It is a can lid characterized by being provided in the panel part in the side by which the termination | terminus part of the said score line is provided.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, the anti-slip portion has a center angle with the rivet as a center of the pushed-down portion such that the tip of the pushed-down portion and the center of the rivet A can lid characterized by being formed in a region that is 30 ° or more and 80 ° or less in a range of angles from a straight line connecting the two.

  According to the first aspect of the present invention, since the anti-slip portion is provided in the depressed portion of the tab, the frictional force generated between the depressed portion and the opening piece at the time of opening can be increased. Can be suppressed. Moreover, since the anti-slip | skid part is provided in the tab, it is not necessary to change the structure of a panel part, and it can apply to the panel part of various shapes. Furthermore, the performance with respect to the internal pressure in a can lid | cover can be maintained by not forming a slip prevention part in the panel part surface.

  According to the invention of claim 2, the anti-slip portion is a portion of the depressed portion that is opposed to the opening piece and is formed on the surface of the corner portion having a curved longitudinal section. Can be effectively suppressed.

  According to the invention of claim 3, since the anti-slip portion is constituted by the groove portion extending in the circumferential direction of the push-down portion, it is possible to effectively suppress the occurrence of idling during opening.

  According to the fourth aspect of the present invention, the anti-slip portion can be reliably brought into contact with the opening piece in the process of lifting the finger hooking portion of the tab upward, and it is possible to effectively suppress the occurrence of an empty swing at the time of opening.

  According to the fifth aspect of the present invention, the anti-slip portion can be reliably brought into contact with the opening piece in the process of lifting the finger hooking portion of the tab upward, and the occurrence of idling can be suppressed more reliably.

It is the top view which showed typically the can lid in an example of this invention. It is the longitudinal cross-sectional view which showed typically the AA longitudinal cross-section of the can lid shown in FIG. It is the bottom view which showed typically the opposing surface with a panel part in the tab shown in FIG. It is the longitudinal cross-sectional view which showed typically the longitudinal cross-section of the pushing-down part in which the anti-slip | skid part was formed in the tab shown in FIG. It is the top view which showed typically the structure except the tab among the can lids shown in FIG.

  Embodiments of a can lid according to the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a plane of the can lid in this specific example, and FIG. 2 shows an AA longitudinal sectional view of the can lid shown in FIG. As shown in the figure, the can lid 1 of this specific example is a so-called steion tab type can lid, which is formed by press-molding a metal thin plate such as an aluminum alloy, and the circular panel portion 2 is formed at the center. An annular groove portion 3 is provided along the outer peripheral edge 2a of the panel portion 2 and recessed downward from the panel portion 2, and extends from the outer peripheral edge of the annular groove portion 3 toward the outer peripheral side and upward. A flange curl portion 4 for fixing the can body, which is formed and has a peripheral end portion curled, is provided. Further, the can lid 1 includes a tab fixing rivet 5 disposed at the center O of the panel portion 2, and the rivet 5 is formed so as to protrude upward from the upper surface of the panel portion 2 and is a tab for opening operation. 10 is fixed. Further, the score line 7 that is easy to break is formed on the panel portion 2 so as to define a predetermined range, and the portion defined by the score line 7 constitutes an opening piece 8 that is deformed to open when opened. . Therefore, the tab 10 and the opening piece 8 are disposed so as to face each other in the vertical direction.

  The outer peripheral edge 10a of the tab 10 is formed in a substantially rectangular shape in plan view, and at both end portions in the longitudinal direction, a finger hook portion 11 is provided as one end portion and a push-down portion 12 is provided as the other end portion. Yes. The finger-hanging portion 11 is a portion on which an opener's finger is hung at the time of opening, and is formed so as to include a portion whose outer peripheral shape is linear. The push-down portion 12 is a portion that presses the opening piece 8 of the panel portion 2 downward at the time of opening, and the outer peripheral shape is formed in a substantially arc shape. Further, the finger-hanging portion 11 and the push-down portion 12 are formed to be connected via a linear longitudinal portion, and the distal end portion 12 a of the push-down portion 12 forms the distal end portion in the longitudinal direction of the tab 10.

  The tab 10 is fixed to the rivet 5 at a plate-shaped fixing portion 13 provided on the inner peripheral side. FIG. 3 shows a bottom view of the tab 10 shown in FIG. 1. As shown in FIG. 3, the fixing portion 13 is provided with a rivet hole 13a which is a through hole, and inside the rivet hole 13a. It is attached to the panel portion 2 by a rivet 5 that penetrates. The center of the rivet hole 13 a of the fixing portion 13 coincides with the center of the rivet 5, that is, the center O of the panel portion 2. Accordingly, the push-down portion 12 is configured to come into contact with the panel portion 2 by the lever action when the finger-hanging portion 11 is lifted upward by the unsealing person. A reinforcing convex bead 14 protruding upward is formed on the upper surface of the longitudinal portion of the tab 10, and the convex bead 14 is formed in a straight line along the outer peripheral edge 10 a in each longitudinal portion.

  In this description, a straight line connecting the tip 12a of the push-down part 12 and the center O of the panel part 2 is described as a reference line M, and a straight line passing through the center O and orthogonal to the reference line M is described as an orthogonal line N. To explain. That is, the reference line M is a straight line connecting the tip end portion 12 a of the pushed-down portion 12 and the center of the rivet hole 13 a of the fixing portion 13 in the tab 10. Further, for convenience of explanation, the tab 10 is not rotated with respect to the panel portion 2 as the rivet 5 and the center of rotation, and the configuration other than the tab 10 will be described using the reference line M and the orthogonal line N. Further, with respect to the region delimited by the reference line M and the orthogonal line N shown in FIG. 1, the upper left region in FIG. 1 is the region I, the lower left region is the region II, the upper right region is the region III, and the lower right region is the region IV. 1 is used for explanation.

  The push-down portion 12 will be described using the region. As shown in FIG. 1, the push-down portion 12 is configured to form a portion corresponding to the region I and the region II in the outer peripheral edge 10a of the panel portion 10. Yes. Specifically, the push-down portion 12 is formed in a substantially arc-shaped outer peripheral shape on the tip end 12a side in the reference line M direction, and conversely, is formed in a linear outer peripheral shape parallel to the reference line M on the orthogonal line N side. ing. In other words, the outer peripheral edge 10 a of the pushed-down portion 12 is formed in a straight line at a portion that intersects the orthogonal line N. Further, as shown in FIG. 2, the push-down portion 12 includes a curled portion 12 </ b> A that is disposed so as to face the opening piece 8 of the panel portion 2 in the vertical direction and is formed by bending a metal plate as a material in a double or triple manner. It is configured as follows.

  FIG. 4 schematically shows a longitudinal sectional view of the push-down portion 12, and as shown in FIG. 4, the curled portion 12A of the push-down portion 12 extends downward and outward from the upper surface 12b toward the outer peripheral edge 10a. The upper corner portion 12c is formed on the outer peripheral edge 10a, and the lower corner portion 12d is formed so as to extend downward and toward the inner peripheral side from the outer peripheral edge 10a toward the lower surface 12e. The lower corner portion 12d and the lower surface 12e form a surface facing the opening piece 8 in the pushed-down portion 12.

  The lower corner portion 12d includes a non-slip portion 15 that forms a portion that contacts the opening piece 8 in the push-down portion 12 and has a surface shape that increases the frictional resistance with the opening piece 8. That is, the anti-slip portion 15 is configured to increase the frictional force generated when it comes into contact with the upper surface of the opening piece 8. For example, the anti-slip portion 15 is formed so as to extend along the circumferential direction of the outer peripheral edge 10 a of the protrusion formed so as to protrude from the surface of the lower corner portion 12 d, a recessed portion recessed from the surface, or the depressed portion 12. It can be constituted by a projected ridge or groove. That is, the anti-slip part 15 is configured by an uneven shape formed on the surface of the lower corner part 12d.

  The anti-slip portion 15 of this specific example is formed by a narrow groove as shown in FIG. 4, and is formed so as to extend in the peripheral direction along the shape of the outer peripheral edge 10a of the push-down portion 12 as shown in FIG. ing. In this case, the anti-slip part 15 has two edges formed of an upper edge part 15a and a lower edge part 15b formed so as to extend in the circumferential direction. The edge portions 15a and 15b serve as frictional resistance between the pushed-down portion 12 and the opening piece 8, and the frictional force can be increased.

  Further, the anti-slip portion 15 is provided in a predetermined range of the lower corner portion 12d. In other words, the anti-slip portion 15 having a surface shape that increases the frictional force may be provided only in the portion of the push-down portion 12 that contacts the opening piece 8 of the panel portion 2. Further, the non-slip portion 15 of this specific example is provided in a range within the region I in the push-down portion 12. In this case, the location where the anti-slip portion 15 is formed can be set by the angular range of the central angle α with the panel center O as the center. In the push-down portion 12 shown in FIG. 1, in the region I, the central angle α from the orthogonal line N is set to an angle range of 10 ° to 60 °, and extends in the circumferential direction over the entire area within this angle range. Thus, a non-slip portion 15 is formed. Note that the anti-slip portion 15 includes any one of the lower corner portions 12d in the region I within an angle range in which the central angle α from at least the orthogonal line N is 10 ° to 60 ° (preferably 30 ° to 60 °). It is preferable to be formed in such a place. That is, the central angle α from the reference line M is formed at any location within an angle range of 30 ° to 80 ° (preferably 30 ° to 60 °). For example, in the case of the non-slip portion 15 configured by a narrow groove, the center angle α from the orthogonal line N of the lower corner portion 12d is within an angle range of 10 ° to 60 ° as shown in FIG. One end of the groove may be included, or the entire area of the fine groove may be included, or both ends of the fine groove may sandwich an angle range of a central angle α10 ° to 60 ° from the orthogonal line N. It may be arranged on both sides.

  Further, an opening piece 8 is provided in a portion of the panel portion 2 that faces the push-down portion 12, and the opening piece 8 is formed on the bottom surface 22 a of the concave portion 22 in the panel portion 2, and is predetermined by the score line 7. It is formed so as to partition the range. The concave portion 22 is formed so as to be recessed downward from the inner peripheral edge of the flat portion 21 having a flat vertical section, the bottom surface 22a having a flat vertical cross section is disposed below the flat portion 21, and the center O of the panel portion 2 is formed. The range is included. Further, the bottom surface 22a and the flat plate portion 21 are connected via an inclined surface formed so as to extend upward and from the outer peripheral edge of the bottom surface 22a. Therefore, the rivet 5 of this specific example is formed so as to protrude upward from the bottom surface 22 a of the recess 22.

  The score line 7 will be described with reference to FIG. FIG. 5 schematically shows a plan view of the configuration of the can lid 1 shown in FIG. 1 excluding the tab 10. As shown in FIG. 5, the score line 7 is first broken at the time of breakage. The start end portion 7S is arranged in the vicinity of the rivet 5, and is formed in a series of curved lines from the start end portion 7S to the end portion 7E to be finally broken, and the both end portions 7S and 7E are arranged so as to be separated from each other. Yes. The portion sandwiched between the start end portion 7S and the end end portion 7E does not allow the opening piece 8 that has been deformed to open toward the inside of the can when the score line 7 is broken across the entire region from being detached from the panel portion 2. A connecting portion 2b to be connected is formed. The connecting part 2b is provided in the region I as shown in FIG.

  Both end portions 7S and 7E of the score line 7 are arranged on the left side in FIG. 5 with respect to the orthogonal line N in the reference line M direction, and are arranged in the region I in detail. That is, the end portion 7E of the score line 7 and the anti-slip portion 15 of the push-down portion 12 are disposed in the same region. Of the points where the score line 7 intersects with the reference line M, if the vicinity of the rivet 5 is the initial score line 7a and the vicinity of the outer peripheral edge 2a of the panel part 2 is the late score line 7c, the score line 7 extends from the starting end 7S. It extends toward the middle-term score line 7b via the initial score line 7a, and is formed in a series of curved shapes so as to reach from the middle-term score line 7b via the latter-stage score line 7c to the end portion 7E. Furthermore, the score line 7 is provided in the area I and the area II over the entire area. The can lid 1 of this specific example has a wide-mouthed opening formed by the opening piece 8, and the shape defined by the score line 7 has a width in the reference line M direction larger than a width in the orthogonal line N direction. Is also formed to be narrow.

  Further, as shown in FIG. 2, the initial score line 7 a is provided in a portion of the panel portion 2 that faces the tab 10, and is closer to the center O side (inner peripheral side) of the panel portion 2 than the tip portion 12 a of the push-down portion 12. ). On the other hand, the late score line 7 c is arranged on the outer peripheral side of the tab 10. Therefore, a part of the opening piece 8 is disposed so as to face the depressed portion 12 of the tab 10 and constitutes a contact portion that contacts the depressed portion 12 of the tab 10.

  The opening piece 8 is provided with a reinforcing convex bead 81 protruding upward from the bottom surface 22a. The convex bead 81 is for reducing the bending of the opening piece 8 at the time of opening and for making the score line 7 easy to break, and is formed along the shape of the score line 7. Specifically, as shown in FIG. 1, the convex beads 81 are provided in an annular shape so that a substantially crescent-shaped bottom surface 22 a is formed on the inner peripheral side, and are substantially elliptical along the inner peripheral edge of the score line 7. An elliptical portion 81a formed in a shape and an edge-side portion 81b formed in a substantially arc shape along the outer peripheral edge 10a of the pushed-down portion 12 are provided.

  Further, a part of the convex bead 81 constitutes a positioning portion 82 that faces the push-down portion 12 in the vertical direction and contacts the push-down portion 12. For example, as shown in FIG. 5, the convex bead 81 includes a positioning portion 82 having a shape in which the outer peripheral edge of the elliptical portion 81 a is extended at a portion where the outer peripheral shape changes from the elliptical portion 81 a to the along-edge portion 81 b. ing. The contact between the positioning portion 82 and the push-down portion 12 prevents the tab 10 from rotating in the circumferential direction around the panel center O and prevents the slip portion 15 of the tab 10 and the positioning portion 82 from being opened. It is possible to generate a frictional force for preventing idling at the contact point.

  On the other hand, in the portion of the panel portion 2 that faces the finger-hanging portion 11, a finger insertion recess 6 that is recessed below the bottom surface 22 a of the recess 22 is provided. Specifically, the finger insertion recess 6 has a bottom surface 6a disposed below the bottom surface 22a of the recess 22, and the bottom surface 6a is inclined upward with respect to the horizontal direction from the outer peripheral edge of the bottom surface 6a. The bottom surface 22a of the concave portion 22 and the flat portion 21 are connected via an inclined surface. In short, the can lid 1 only needs to be configured such that the finger hooking portion 11 of the tab 10 and the finger insertion concave portion 6 face each other in the vertical direction, and the finger hanging portion 11 faces the bottom surface 6a of the finger insertion concave portion 6. Alternatively, the finger-hanging portion 11 may be configured not to face the bottom surface 6a of the finger-inserting recess 6 that faces the inclined surface.

  As shown in FIG. 5, a portion of the bottom surface 22a of the recess 22 facing the tab 10 in the vertical direction is formed in a shape along the periphery of the rivet 5 and is recessed downward from the bottom surface 22a. A concave bead 23 and a convex portion 24 projecting upward from the bottom surface 22a are formed. The concave bead 7 is disposed in the vicinity of the rivet 5 and is formed in a substantially arc shape. Moreover, the convex part 24 is provided in two places of the outer peripheral side rather than the concave bead 23, and is comprised so that the lower surface of the longitudinal part in the tab 10 may be contact | abutted. Further, a concave surface 25 that is recessed upward is formed on the lower surface (inner surface) of the flat portion 21 in the panel portion 2. The concave surface 25 is formed in an arc shape along the outer peripheral edge 2 a of the panel portion 2, and includes a concave surface 25 a provided on the opening piece 8 side and a concave surface 25 b provided on the finger insertion concave portion 6 side.

  Next, the operation of the can lid 1 when the tab 10 is opened will be described. First, when the tab 10 starts to be opened in the unopened can container, the finger hook portion 11 which is one end portion of the tab 10 is lifted upward, whereby the fixing portion 13 and the rivet 5 of the tab 10 are lifted upward. In this case, the push-down portion 12 which is the other end portion of the tab 10 is such that the abutting portion including the anti-slip portion 15 is located above the bottom surface 22a and the bottom surface 22a of the opening piece 8 in a state where the score line 7 is not broken at all. It is in contact with the positioning portion 82 that protrudes from the center. That is, in the initial stage of opening when the score line 7 is not broken, in the tab 10, the finger hook portion 11 is a force point, the push-down portion 12 is a fulcrum, and the fixing portion 13 is an action point. It arranges in order of a point and a fulcrum, and the tab 10 becomes what is called a second kind insulator. By causing the second type of lever action, the fixing portion 13 of the tab 10 and the rivet 5 of the panel portion 2 are displaced upward, so that the center of the panel portion 2 near the rivet 5 is deformed upward. When the score line 7 is in an unbroken state and the tab 10 is not opened, the contact portion of the push-down portion 12 is formed so as not to contact the opening piece 8 of the panel portion 2. May be configured such that the push-down portion 12 is displaced downward and comes into contact with the opening piece 8 while the tab 10 starts to be opened and the above-described second kind of lever action is generated.

  When the finger hooking portion 11 of the tab 10 is further lifted upward in the state where the second kind of lever action is generated, the upward force acting on the rivet 5 of the panel portion 2 increases, and the score line 7 starts to be broken from the start end portion 7S. When this initial break occurs, the score line 7 starts to break from the starting end portion 7S toward the initial score line 7a. Further, at the time of the initial break, the anti-slip portion 15 of the push-down portion 12 contacts the positioning portion 82 and the bottom surface 22a of the opening piece 8 to generate a frictional force in the opening direction of the tab 10.

  After the initial breakage, when the finger hook portion 11 is further lifted upward, in the tab 10, the push-down portion 12 serves as an action point, the fixing portion 13 serves as a fulcrum, and the finger hook portion 11 serves as a power point. The power points, fulcrums, and action points are arranged in this order from the right side, and the tab 10 is a so-called first-type insulator. In the state in which the first kind of lever action is generated, the can lid 1 is subjected to an external force that displaces the finger hook portion 11 that is one end portion in the longitudinal direction in a direction away from the panel portion 2 (upward). The push-down portion 12 that is an end portion is configured to continue to displace the opening piece 8 in a state of being in contact with the opening piece 8. That is, the push-down portion 12 presses the opening piece 8 downward while the anti-slip portion 15 of the push-down portion 12 is in frictional contact with the bottom surface 22 a of the opening piece 8 and the positioning portion 82.

  As described above, in the first kind of lever action state, when the pressing portion 12 of the tab 10 presses the opening piece 8 downward, the remaining portion of the score line 7 that was not broken at the initial break is broken. . Specifically, a medium-term rupture that breaks from the initial score line 7a to the medium-term score line 7b in the score line 7 occurs, and then a later-stage rupture that breaks the portion from the late score line 7c to the terminal portion 7E occurs. . Therefore, the score line 7 is ruptured over the entire region, and a desired opening is formed in the panel portion 2, and the opening piece 8 is partially connected to the bottom surface 22 a of the panel portion 2. In the state, it is plastically deformed inside the container.

  At the time of the middle break, the opening piece 8 is broken at the score line from the start end portion 7S to the middle term score line 7b, and is connected to the bottom surface 22a of the panel portion 2 by the knot portion 2b and the unbroken late score line 7c. . Therefore, the opening piece 8 in the middle fracture state is deformed by being inclined with respect to the horizontal direction in the orthogonal line N direction, and the region II side portion is deformed downward as compared with the region I side portion. That is, at the time of the middle break, the portion on the region I side in the pushed-down portion 12 maintains a contact state with the opening piece 8. In other words, at the time of the middle break, a portion of the pushed-down portion 12 on the region I side rather than a portion on the region II side applies a load that presses the opening piece 8 downward. Therefore, according to the can lid 1 of this specific example, since the anti-slip portion 15 is provided at the location in the region II of the push-down portion 12, the opening partially deformed at the middle and later breaks. It is possible to reduce the sliding of the push-down portion 12 with respect to the piece 8. As a result, the score line 7 can be reliably broken across the entire region without causing an idling.

  In short, the can lid 1 in this specific example is configured such that the anti-slip portion 15 of the push-down portion 12 continues to be in frictional contact with the upper surface of the opening piece 8 during the period from the initial break to completion of the break. In particular, the anti-slip portion 15 is provided in a portion of the push-down portion 12 that presses the opening piece 8 downward when breaking the score line 7 in the portion from the late score line 7c to the end portion 7E. Therefore, in the can lid 1 in this specific example, the sliding portion provided in the abutting portion so that the abutting portion of the push-down portion 12 can continue to press the opening piece 8 downward during the above-described first-type lever action. A frictional force can be continuously generated between the stopper 15 and the upper surface of the opening piece 8.

  In addition, the above-mentioned upper direction and the downward direction are the cases where the can container is made upright so that the can lid 1 is on the upper side in the can container (can body) formed by joining the can lid 1 to the cylindrical can body. In the vertical direction. For example, in the can lid 1 shown in FIG. 1, the near side in the figure is the upper side, and the far side is the lower side. In the radial direction, the direction parallel to the radial direction is described as the horizontal direction, the inner side in the radial direction is described as the inner peripheral side, and the outer side in the radial direction is described as the outer peripheral side.

  As described above, according to the can lid of this specific example, the tab push-down portion is provided with the anti-slip portion that increases the frictional resistance with the panel portion. The slippage at the contact point between the tab and the panel portion can be reduced.

  The present invention is not limited to the specific examples described above, and can be modified without departing from the object of the invention. For example, the outer peripheral shape of the depressed portion in the tab is not limited to the shape of the specific example described above, and may be formed in a substantially arc shape over the entire region.

  DESCRIPTION OF SYMBOLS 1 ... Can lid, 2 ... Panel part, 2a ... Outer periphery, 3 ... Annular groove part, 4 ... Flange curl part, 5 ... Rivet, 6 ... Recess for finger insertion, 7 ... Score line, 8 ... Opening piece, 10 ... Tab 11 ... Finger hooking part, 12 ... Push-down part, 13 ... Adhering part, 15 ... Anti-slip part.

Claims (5)

A rivet formed protruding from the center of the upper surface of the panel portion;
An opening piece formed by dividing the panel portion by score lines;
A tab attached to the rivet having a depressed portion arranged at one end so as to face the opening piece in the vertical direction;
A finger hook provided on the other end of the tab opposite to the pressed-down part,
When the finger-hanging portion is lifted upward, the push-down portion abuts on the opening piece and presses the opening piece downward to break the score line and open the opening piece. In the can lid,
The said push-down part is provided with the slip prevention part by which the surface shape was formed in the unevenness | corrugation in the part which contacts the said opening piece, The can lid characterized by the above-mentioned. The push-down portion includes a corner portion having a curved longitudinal section at a portion facing the opening piece,
The can lid according to claim 1, wherein the anti-slip portion is formed on a surface of the corner portion.   3. The can lid according to claim 1, wherein the anti-slip portion is a groove formed to extend in a direction along an outer peripheral edge of the push-down portion. The tab is formed in a substantially rectangular shape,
The push-down portion constitutes one end portion in the longitudinal direction of the tab, and has a tip portion in the longitudinal direction in a portion formed in a substantially arc shape,
The non-slip portion is provided on the side of the push-down portion where the end portion of the score line is provided on the panel portion with respect to a straight line connecting the tip portion of the push-down portion and the center of the rivet. The can lid according to any one of claims 1 to 3, wherein the can lid is provided.   The non-slip portion has a central angle with the rivet as a center of the depressed portion, and an angle range from a straight line connecting a tip portion of the depressed portion and the center of the rivet is 30 ° or more and 80 ° or less. The can lid according to claim 4, wherein the can lid is formed in a region.

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