Patent Publication Number: US-2019177034-A1

Title: Can lid

Description:
TECHNICAL FIELD 
     The present invention relates to a can lid provided in a can for storing a beverage or food. 
     BACKGROUND 
     A can lid provided in a can for storing a beverage or food has a tab for opening the lid along a score scribed on the lid body. The tab is generally fixed to the lid body by a rivet. In order to form an opening in the lid body of such a can lid, one has to hook a finger on an end side of the tab and pull up the tab. Therefore, a tab of a can lid having no gap or a slight gap between a lid body and the tab sometimes cannot be easily pulled up. 
     SUMMARY OF THE DISCLOSURE 
     An object of the present invention is to provide a can lid that enables a tab to be easily pulled up. 
     In response to the above issue, the present invention adopts the following means. 
     A can lid according to the present invention is a can lid that has 
     a lid body having a scribed score, and 
     a tab fixed to the lid body, wherein 
     the tab includes 
     a leading end positioned inside a predetermined opening area bordered by the score, and 
     a rear end positioned on an opposite side to the leading end relative to a portion where the tab is fixed to the lid body, and 
     the can lid includes a sliding member which is configured to slide in a state where a part thereof penetrates into a gap between the lid body and the tab, the sliding member having an insertion section which is configured to move the rear end of the tab in a direction away from a surface of the lid body when the sliding member is caused to slide from an initial position. 
     According to the present invention, by causing the sliding member to slide, the rear end of the tab can be moved in a direction away from the surface of the lid body. This allows the tab to be more easily pulled up than a tab with the rear end thereof in contact with the surface of the lid body or a tab with the rear end thereof not in contact with the surface of the lid body but a slight gap formed between the rear end thereof and the surface of the lid body. 
     A protruding section may be provided on at least one of the lid body and the tab, the protruding section being configured to be in sliding contact with the sliding member while the sliding member is caused to slide from the initial position. 
     This configuration allows the rear end of the tab to be moved in a direction away from the surface of the lid body since the sliding member is in sliding contact with the protruding section while the sliding member is caused to slide from the initial position. 
     A rotation-stopping protrusion may be provided in an area opposing the tab in the lid body, the rotation-stopping protrusion being configured to restrict movement of the tab in a rotation direction, and the rotation-stopping protrusion may have a protruding section that is configured to be in sliding contact with the sliding member while the sliding member is caused to slide from the initial position. 
     This configuration enables the rotation-stopping protrusion that restricts movement of the tab in the rotation direction to have a function of moving the rear end of the tab in a direction away from the surface of the lid body. 
     A protruding section may be provided on the sliding member, the protruding section being configured to be in sliding contact with the lid body or the tab while the sliding member is caused to slide from the initial position. 
     Such protruding section formed on the sliding member in this manner even allows the rear end of the tab to be moved in a direction away from the surface of the lid body. 
     A distance from an end surface on the lid body side to an end surface on the tab side in the insertion section may be shorter on a leading end side of the insertion section in a slide direction than on a rear end side. 
     Such configuration even allows the rear end of the tab to be moved in a direction away from the surface of the lid body. 
     The sliding member may have an operating section for operating the sliding member. In this case, the operating section may have at least any one of a projection, a recess, a hole, and a non-slip structure section. 
     This configuration enables an operation for causing the sliding member to slide to be performed more easily. 
     It should be noted that the respective components described above may be combined with each other to the greatest extent allowable. 
     Advantageous Effects of Invention 
     As described above, according to the present invention, a tab can be easily pulled up. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view of a can lid according to a first embodiment. 
         FIG. 2  is a plan view of a lid body according to the first embodiment. 
         FIG. 3  is a schematic sectional view of the lid body according to the first embodiment. 
         FIG. 4  is a plan view of a tab according to the first embodiment. 
         FIG. 5  is a schematic sectional view of the tab according to the first embodiment. 
         FIG. 6  is a plan view of a sliding member according to the first embodiment. 
         FIG. 7  is a schematic sectional view of the can lid according to the first embodiment. 
         FIG. 8  is a plan view of the can lid showing a situation in which the sliding member is operated according to the first embodiment. 
         FIG. 9  is a schematic sectional view of the can lid showing a situation in which the sliding member is operated according to the first embodiment. 
         FIG. 10  is a schematic sectional view of a sliding member according to a first modification. 
         FIG. 11  is an external view of a sliding member according to a second modification. 
         FIG. 12  is an external view of a sliding member according to a third modification. 
         FIG. 13  is an external view of a sliding member according to a fourth modification. 
         FIG. 14  is an external view of a sliding member according to a fifth modification. 
         FIG. 15  is a plan view of a can lid according to a second embodiment. 
         FIG. 16  is a plan view of a can lid according to a third embodiment. 
         FIG. 17  is a plan view of a can lid according to a fourth embodiment. 
         FIG. 18  is a plan view of a can lid according to a fifth embodiment. 
         FIG. 19  is a plan view and a partial sectional view of a can lid according to a sixth embodiment. 
         FIG. 20  is a plan view and a partial sectional view of a can lid according to a seventh embodiment. 
         FIG. 21  is a plan view and a partial side view of a can lid according to an eighth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Modes for implementing the present invention will now be exemplarily described in detail based on embodiments with reference to the drawings. It is to be understood that dimensions, materials, shapes, relative arrangements, and the like of components described in the embodiments are not intended to limit the scope of the present invention to the embodiments described below unless specifically stated to the contrary. A can lid in the present invention is provided in a can for storing a beverage or food. Can lids provided in beverage cans are commonly partially-open type can lids in which only a part of a lid body opens, while can lids provided in food cans are commonly full aperture type can lids in which approximately an entire area of a lid body opens. The following embodiments will be described using a partially-open type can lid provided in a beverage can as an example. 
     First Embodiment 
     A can lid according to a first embodiment of the present invention will be described with reference to  FIGS. 1 to 9 .  FIG. 1  is a plan view of the can lid according to the first embodiment.  FIG. 2  is a plan view of a lid body according to the first embodiment.  FIG. 3  is a schematic sectional view of the lid body according to the first embodiment and represents a sectional view taken along A 2 -A 2  in  FIG. 2 .  FIG. 4  is a plan view of a tab according to the first embodiment.  FIG. 5  is a schematic sectional view of the tab according to the first embodiment and represents a sectional view taken along A 3 -A 3  in  FIG. 4 .  FIG. 6  is a plan view of a sliding member according to the first embodiment.  FIG. 7  is a schematic sectional view of the can lid according to the first embodiment and represents a sectional view taken along A 1 -A 1  in  FIG. 1 .  FIG. 8  is a plan view of the can lid showing a situation in which the sliding member is operated according to the first embodiment.  FIG. 9  is a schematic sectional view of the can lid showing a situation in which the sliding member is operated according to the first embodiment and represents a sectional view taken along A 4 -A 4  in  FIG. 8 . 
     &lt;Configuration of can Lid&gt; 
     A configuration of a can lid  10  according to the first embodiment will be described with reference to  FIGS. 1 to 7 . The can lid  10  according to the first embodiment has a lid body  100 , a tab  200  fixed to the lid body  100 , and a sliding member  300  attached to the lid body  100 . The lid body  100 , the tab  200 , and the sliding member  300  constituting the can lid  10  are all made of a metal such as aluminum. 
     The lid body  100  has a scribed score  110 , a first rivet  120  for fixing the tab  200 , and a pair of protruding sections  130 . As indicated by dotted lines in  FIGS. 1 and 2 , an area bordered by the score  110  is a predetermined opening area O. An area depicted by an xx line in  FIG. 2  is an opening start area OS. The opening start area OS is present in a vicinity of the first rivet  120 . The pair of protruding sections  130  each having an approximately conical shape and formed in an area facing the tab  200  function as a rotation-stopping protrusion that restricts movement of the tab  200  in a rotation direction. The lid body  100  is provided with a second rivet  140  which rotatably supports the sliding member  300 . The second rivet  140  may be provided by a riveting process to the lid body  100  or bonding a member to be the second rivet  140 . 
     The tab  200  has a through-hole  210  to be fixed by the first rivet  120 , a leading end  220  on one side of the through-hole  210 , and a rear end  230  on an opposite side to the leading end  220 . The tab  200  has a U-shaped hole  240  which allows the tab  200  to easily deform when pulled up. The tab  200  has a finger hooking ring  250  on which one can hook a finger. In a state where the tab  200  is fixed to the lid body  100 , the leading end  220  of the tab  200  is positioned inside the predetermined opening area O of the lid body  100 . The rear end  230  of the tab  200  is positioned on an opposite side to the leading end  220  relative to a portion where the tab  200  is fixed to the lid body  100  (a portion where the first rivet  120  is provided). When opening the predetermined opening area O, a user normally hooks a finger on the rear end  230  or the finger hooking ring  250  and pulls up the tab  200 . 
     The sliding member  300  has an insertion section  310  which causes the rear end  230  of the tab  200  to move in a direction in which the rear end  230  separates from a surface of the lid body  100  and a through-hole  320  which allows the sliding member  300  to be rotatably supported by the second rivet  140  provided on the lid body  100 . A tab-side end edge of the insertion section  310  has a thickness that allows the insertion section  310  to be inserted between the lid body  100  and the tab  200 , and the sliding member  300  attached to the lid body  100  can be rotated around the second rivet  140 . When the sliding member  300  is rotated clockwise in  FIG. 1 , the sliding member  300  can slide (rotate) in a state where a part (the insertion section  310 ) of the sliding member  300  has penetrated into a gap between the lid body  100  and the tab  200 . 
     &lt;Sliding of Sliding Member&gt; 
     An operation of the tab that is caused by sliding the sliding member  300  will be described with reference to  FIGS. 8 and 9 .  FIG. 8  is a plan view of the can lid representing a state where the sliding member  300  has been rotated clockwise by a prescribed angle from an initial position shown in  FIG. 1 .  FIG. 9  is a sectional view taken along A 4 -A 4  in  FIG. 8 . In a state where the sliding member  300  is at the initial position, the insertion section  310  does not penetrate into a gap between the lid body  100  and the tab  200  (see  FIG. 1 ). The sliding member  300  is configured such that rotating (sliding) the sliding member  300  causes the insertion section  310  to penetrate into the gap between the lid body  100  and the tab  200 . 
     While the sliding member  300  is caused to rotate (slide), after the insertion section  310  penetrates into the gap between the lid body  100  and the tab  200 , the insertion section  310  comes into contact with the protruding section  130  and subsequently runs on the protruding section  130 . The insertion section  310  is configured to run on a left-side protruding section  130  in  FIG. 2  in the pair of protruding sections  130  shown in the drawing. When the insertion section  310  runs on and is in sliding contact with the protruding section  130 , the rear end  230  is caused to move in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  (see  FIG. 9 ). 
     &lt;Advantages of can Lid According to First Embodiment&gt; 
     As described above, sliding the sliding member  300  of the can lid  10  according to the first embodiment from its initial position causes the rear end  230  of the tab  200  to move in a direction in which the rear end  230  separates from the surface of the lid body  100 . This allows a user to insert a finger into a gap formed between the rear end  230  and the lid body  100  so that the tab  200  can be easily pulled up. In addition, making the sliding member  300  run on the protruding section  130  as a rotation-stopping protrusion for restricting movement of the tab  200  in the rotation direction causes the rear end of the tab  200  to move further in a direction in which the rear end separates from the surface of the lid body. 
     &lt;Note&gt; 
     The first embodiment includes a protruding section  130  that is in sliding contact with the sliding member  300  while the sliding member  300  is caused to slide from its initial position  130 , and the protruding section  130  is formed on the lid body  100 . However, such a protruding section may be formed on the tab. For example, the tab  200  of the first embodiment may have a protruding section on it that protrudes toward the lid body  100 . Such protruding section may be configured so that the insertion section  310  penetrates between the protruding section (not shown) formed on the tab  200  and the lid body  100  after the insertion section  310  penetrates into the gap between the lid body  100  and the tab  200  while the sliding member  300  is caused to rotate (slide) from its initial position. This allows the rear end  230  of the tab  200  to move in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum when the sliding member  300  is caused to slide in a similar manner to the first embodiment. 
     The sliding member of the first embodiment may have a protruding section that is in sliding contact with the lid body or the tab while the sliding member is caused to slide from its initial position. For example, the insertion section  310  of the sliding member  300  of the first embodiment may have a protruding section  310 X as shown in  FIG. 6 . The protruding section  310 X may be provided on at least one of both surfaces of the insertion section  310 . When the insertion section  310  penetrates into the gap between the lid body  100  and the tab  200 , the protruding section  310 X is in sliding contact with the lid body  100  or the tab  200  while the sliding member  300  is caused to rotate (slide) from its initial position. Providing the protruding section  310 X on both surfaces of the insertion section  310  causes each protruding section  310 X to be in sliding contact with both the lid body  100  and the tab  200 . This allows the rear end  230  of the tab  200  to move in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum when the sliding member  300  is caused to slide in a similar manner to the first embodiment. 
     The insertion section  310  of the sliding member  300  of the first embodiment does not penetrate into the gap between the lid body  100  and the tab  200  in an initial state. When the insertion section  310  penetrates into the gap between the lid body  100  and the tab  200  while the sliding member  300  is caused to slide, the rear end  230  of the tab  200  moves by a certain distance in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. In order to increase the gap between the rear end  230  of the tab  200  and the surface of the lid body  100  to the greatest extent allowable, the protruding section can be provided. The protruding section may be provided on any of the lid body  100 , the tab  200 , and the sliding member  300  as described above. The protruding section may be provided on two or more of the lid body  100 , the tab  200 , and the sliding member  300 . The tab  200  may have a grasping surface without forming the finger hooking ring  250 , and the grasping surface as a whole may be configured as a protruding section or a protruding section may be provided on a part of the grasping surface, the protruding section protruding toward the lid body  100  side. Various methods are possible for attaching the sliding member such as fixing by an adhesive for example and not limited to the above described method using the second rivet  140 . 
     &lt;Modifications of Sliding Member&gt; 
     Several modifications of a sliding member applicable to the can lid according to the first embodiment will now be described. 
     (First Modification) 
     A sliding member according to a first modification will be described with reference to  FIG. 10 .  FIG. 10  is a schematic sectional view of the sliding member according to the first modification and is a sectional view corresponding to a cross section taken along B-B in a diagram representing a case where the protruding section  310 X shown in  FIG. 6  is not provided. The sliding member according to the first modification is configured to be sloped toward a leading end side so that a height of the insertion section  310  in a thickness direction is greater on a left side in  FIG. 10  than on a right side (i.e. H 1 &lt;H 2  as shown in  FIG. 10 ). Such a configuration makes it easier to cause the insertion section  310  to enter the gap between the lid body  100  and the tab  200  while the sliding member is caused to slide and enables the rear end  230  of the tab  200  to be gradually moved in a direction in which the rear end  230  separates from the surface of the lid body  100 . 
     In the first modification, the sloped configuration described above is realized by applying a bending process to an outer edge (on the leading end side) of the insertion section  310 . The sloped configuration described above can also be realized by varying a thickness of a metal plate which is made of aluminum or the like and which constitutes the insertion section  310 . A length in the insertion section  310  of the first modification from an end surface on the lid body side to an end surface on the tab side is configured to gradually change because of an inclined surface provided on an upper side as shown in  FIG. 10 . A length in the insertion section from an end surface on the lid body side to an end surface on the tab side can be configured to change in stages by providing a stair-like step. 
     The sliding member according to the first modification allows a large gap to be formed between the rear end  230  and the lid body  100  by sliding the sliding member. This allows a protruding section (the protruding section  130  or the like) described above to be omitted. Of course the sliding member according to the first modification and a protruding section may be used in combination. 
     (Second Modification) 
     A sliding member according to a second modification will be described with reference to  FIG. 11 .  FIG. 11  is an external view of the sliding member according to the second modification. In the left side of  FIG. 11  is shown a plan view of the sliding member and in the right side the sliding member as viewed in a direction indicated by an arrow depicted in the plan view. 
     A sliding member  300 A according to the second modification has a projection  330  as an operating section for operating the sliding member  300 A. The projection  330  allows a user to hook a finger on the projection  330 , thereby the sliding member  300 A can be easily caused to slide. 
     (Third Modification) 
     A sliding member according to a third modification will be described with reference to  FIG. 12 .  FIG. 12  is an external view of the sliding member according to the third modification. In the left side of  FIG. 12  is shown a plan view of the sliding member and in the right side the sliding member as viewed in a direction indicated by an arrow depicted in the plan view. 
     A sliding member  300 B according to the third modification has a recess  340  as an operating section for operating the sliding member  300 B. The recess  340  allows a user to hook a finger on the recess  340 , thereby the sliding member  300 B can be easily caused to slide. 
     (Fourth Modification) 
     A sliding member according to a fourth modification will be described with reference to  FIG. 13 .  FIG. 13  is an external view (a plan view) of the sliding member according to the fourth modification. 
     A sliding member  300 C according to the fourth modification has a hole  350  as an operating section for operating the sliding member  300 C. The hole  350  allows a user to hook a finger on the hole  350 , thereby the sliding member  300 C can be easily caused to slide. 
     (Fifth Modification) 
     A sliding member according to a fifth modification will be described with reference to  FIG. 14 .  FIG. 14  is an external view (a plan view) of the sliding member according to the fifth modification. 
     A sliding member  300 D according to the fifth modification has a non-slip structure section  360  as an operating section for operating the sliding member  300 D. The non-slip structure section  360  has a structure which increases frictional resistance so as to prevent a finger from slipping. The non-slip structure section  360  which prevents a finger from slipping allows a user to easily cause the sliding member  300 D to slide. An example non-slip structure section  360  may be a minute textured surface on a metallic sliding member  300 D obtained through a blasting process. 
     An example operating section is a projection (the second modification), a recess (the third modification), a hole (the fourth modification), or a non-slip structure section (the fifth modification) as described above, but not limited to them. The operating section may have at least any one of a projection, a recess, a hole, and a non-slip structure section, that is, the operating section may be configured by appropriately combining two or more of a projection, a recess, a hole, and a non-slip structure section. 
     Hereinafter, configurations in which the sliding member is configured differently from the first embodiment described above will be presented in second to eighth embodiments. Since other configurations and effects of such as the lid body and the tab are approximately the same as those of the first embodiment, the same components will be denoted by the same reference characters and a description thereof will be omitted. 
     Second Embodiment 
       FIG. 15  is a plan view of a can lid according to a second embodiment.  FIG. 15  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 15  shows a state where a sliding member  300 E is at its initial position. 
     As shown in  FIG. 15 , the can lid  10  according to the second embodiment has a lid body  100 , a tab  200  fixed to the lid body  100 , and a sliding member  300 E attached to the lid body  100 . The sliding member  300 E according to the second embodiment is rotatably supported by a second rivet  140 E provided on the lid body  100 . A position of the second rivet  140 E differs from that of the first embodiment. 
     The sliding member  300 E is configured so as to penetrate into the gap between the lid body  100  and the tab  200  at an initial position of the sliding member  300 E. The sliding member  300 E has a rectangular plate-like member. The one end side of the sliding member  300 E is rotatably supported by the second rivet  140 E. A projection  330 E as an operating section is formed on the other end side of the sliding member  300 E. A portion near the projection  330 E functions as an insertion section  310 E. 
     When the sliding member  300 E of the can lid  10  according to the second embodiment is caused to rotate (slide) in a direction indicated by an arrow R in  FIG. 15 , the insertion section  310 E is caused to come into contact with the protruding section  130 E provided on the lid body  100  and subsequently run on and be in sliding contact with the protruding section  130 E. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. 
     As described above, the second embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the second embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 E. A protruding section may be provided on the tab  200  instead of on the lid body  100  in the second embodiment as in the first embodiment. The insertion section  310 E may be configured to have different heights in a thickness direction of the insertion section  310 E between a leading end side and a rear end side in a slide direction as in the first modification shown in  FIG. 10 . An operating section may not be limited to the projection  330 E but various configurations may be adopted for the operating section as presented in the above described third to fifth modifications. 
     The sliding member  300 E of the second embodiment is rotatably supported by the second rivet  140 E provided outside the finger hooking ring  250  in the tab  200  and on a right side in  FIG. 15 . A position where the sliding member  300 E is rotatably supported is not limited to the above described example. The position may be arranged inside the finger hooking ring  250  or arranged outside the finger hooking ring  250  and on an upper side in  FIG. 15 . Further, a direction in which the sliding member  300 E is caused to slide (rotate) from its initial position is not limited to the above described example. 
     Third Embodiment 
       FIG. 16  shows a third embodiment.  FIG. 16  is a plan view of a can lid according to the third embodiment.  FIG. 16  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 16  shows a state where a sliding member  300 F is at its initial position. 
     As shown in  FIG. 16 , the can lid  10  according to the third embodiment has a lid body  100 , a tab  200  fixed to the lid body  100 , and a sliding member  300 F attached to the lid body  100 . The sliding member  300 F according to the third embodiment is rotatably supported by a first rivet  120  for fixing the tab  200 . In other words, the first rivet  120  has a function of fixing the tab  200  as well as rotatably supporting the sliding member  300 F. 
     The sliding member  300 F does not penetrate into the gap between the lid body  100  and the tab  200  at an initial position in a similar manner to the first embodiment. The sliding member  300 F has an approximately fan-shaped plate-like member, an insertion section  310 F formed on the leading end side in a rotation (slide) direction, and a projection  330 F as an operating section formed on the rear end side. 
     When the sliding member  300 F of the can lid  10  according to the third embodiment is caused to rotate (slide) in a direction indicated by an arrow R in  FIG. 16 , the insertion section  310 F is caused to come into contact with the protruding section  130 F after penetrating into the gap between the lid body  100  and the tab  200  and subsequently run on and be in sliding contact with the protruding section  130 F. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. 
     As described above, the third embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the third embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 F. A protruding section may be provided on the tab  200  or the sliding member  300 F instead of on the lid body  100  in the third embodiment as in the first embodiment. The insertion section  310 F may be configured to have different heights in a thickness direction of the insertion section  310 F between a leading end side and a rear end side in a slide direction as in the first modification shown in  FIG. 10 . An operating section may not be limited to the projection  330 F but various configurations may be adopted for the operating section as in the above described third to fifth modifications. 
     Fourth Embodiment 
       FIG. 17  shows a fourth embodiment.  FIG. 17  is a plan view of a can lid according to the fourth embodiment. It should be noted that a sectional view of a part near a sliding member is also shown to the left of the plan view.  FIG. 17  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 17  shows a state where a sliding member  300 G is at its initial position. 
     As shown in  FIG. 17 , the can lid  10  according to the fourth embodiment has a lid body  100 , a tab  200  fixed to the lid body  100  and a sliding member  300 G. The sliding member  300 G according to the fourth embodiment has a rectangular plate-like member and bent sections  371 G and  372 G provided at both ends in a direction perpendicular to a slide direction (a direction indicated by an arrow S in  FIG. 17 ). In the tab  200 , a curling process is applied to linear sections  251  and  252  on both sides across the finger hooking ring  250 . The sliding member  300 G is attached so that the bent sections  371 G and  372 G described above are inserted into the linear sections  251  and  252  to which the curling process is performed in the tab  200 . Thus, the fourth embodiment does not have a rivet for rotatably supporting the sliding member contrary to the respective embodiments described above. 
     The sliding member  300 G according to the fourth embodiment has a projection  330 G at a center thereof. The sliding member  300 G is arranged inside the gap between the lid body  100  and the tab  200 . The sliding member  300 G is arranged so that the projection  330 G protrudes through the finger hooking ring  250  from a rear surface side (the lid body  100  side) toward a front surface side of the tab  200 . Portions near both sides of the projection  330 G respectively function as an insertion section  310 G. 
     When the sliding member  300 G of the can lid  10  according to the fourth embodiment configured as described above is caused to slide in a direction indicated by an arrow S in  FIG. 17 , the pair of insertion sections  310 G are caused to come into contact with the pair of protruding sections  130 G provided on the lid body  100  and subsequently run on and be in sliding contact with the protruding sections  130 G. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. Both ends of the projection  330 G in the sliding member  300 G of the fourth embodiment is guided by both side surfaces of the finger hooking ring  250  provided in the tab  200 , thereby the slide direction of the sliding member  300 G is determined. 
     As described above, the fourth embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the fourth embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 G. A protruding section may be provided on the tab  200  instead of on the lid body  100  in the fourth embodiment as in the first embodiment. The insertion section  310 G may be configured to have different heights in a thickness direction of the insertion section  310 G between a leading end side and a rear end side in a slide direction as in the first modification shown in  FIG. 10 . 
     While the sliding member  300 G in the fourth embodiment is configured to slide in a vertical direction in  FIG. 17 , the sliding member  300 G may be configured to slide in a horizontal direction in  FIG. 17 . In this case, a protruding section that is in sliding contact with the sliding member  300 G while the sliding member  300 G is caused to slide from an initial position may be provided on the lid body  100  or the tab  200 . While the sliding member  300 G in the fourth embodiment is caused to slide downward in  FIG. 17  from its initial position, the sliding member  300 G may be caused to slide upward in  FIG. 17  from its initial position. In this case, a protruding section may be provided on an upper side in  FIG. 17  with respect to the sliding member  300 G. 
     Fifth Embodiment 
       FIG. 18  shows a fifth embodiment.  FIG. 18  is a plan view of a can lid according to the fifth embodiment.  FIG. 18  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 18  shows a state where a sliding member  300 H is at its initial position. 
     As shown in  FIG. 18 , the can lid  10  according to the fifth embodiment has a lid body  100 , a tab  200  fixed to the lid body  100  and a sliding member  300 H. The sliding member  300 H according to the fifth embodiment has a pair of projections  330 H as an operating section. Each of the pair of projections  330 H is positioned near each of both sides of the tab  200 . The lid body  100  has a pair of guiding projections  150  for determining a slide direction of the sliding member  300 H. The fifth embodiment does not have a rivet for rotatably supporting the sliding member as in the fourth embodiment. 
     The sliding member  300 H according to the fifth embodiment has an approximately rectangular plate-like member and each of the projections  330 H described above is provided near each of both ends of the sliding member  300 H. The sliding member  300 H is arranged inside the gap between the lid body  100  and the tab  200 . The sliding member  300 H is arranged so that both ends of the sliding member  300 H are sandwiched between the pair of guiding projections  150 . A portion of the sliding member  300 H sandwiched between the lid body  100  and the tab  200  in an initial state functions as an insertion section  310 H. Therefore, the insertion sections  310 H are provided in pairs. 
     When the sliding member  300 H of the can lid  10  according to the fifth embodiment configured as described above is caused to slide in a direction indicated by an arrow S in  FIG. 18 , the pair of insertion sections  310 H are caused to come into contact with the pair of protruding sections  130 H provided on the lid body  100  and subsequently run on and be in sliding contact with the protruding sections  130 H. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. Both ends of the sliding member  300 H of the fifth embodiment are guided by the pair of guiding projections  150  provided on the lid body  100 , thereby the slide direction of the sliding member  300 H is determined. 
     As described above, the fifth embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the fifth embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 H. A protruding section may be provided on the tab  200  instead of on the lid body  100  in the fifth embodiment as in the first embodiment. The insertion section  310 H may be configured to have different heights in a thickness direction of the insertion section  310 H between a leading end side and a rear end side in a slide direction as in the first modification shown in  FIG. 10 . An operating section may not be limited to the projection  330 H but various configurations may be adopted for the operating section as in the above described third to fifth modifications. The sliding member  300 H of the fifth embodiment is arranged inside the gap between the lid body  100  and the tab  200  in an initial state. The sliding member  300 H may be configured to be arranged outside the tab  200  (an upper side in  FIG. 18 ) in the initial state and to enter the gap between the lid body  100  and the tab  200  while the sliding member  300 H is caused to slide. 
     Sixth Embodiment 
       FIG. 19  shows a sixth embodiment.  FIG. 19  is a plan view of a can lid according to the sixth embodiment. It should be noted that a sectional view of a part near a sliding member and a side view are also shown to the right of the plan view.  FIG. 19  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 19  shows a state where a sliding member  300 I is at its initial position. 
     As shown in  FIG. 19 , the can lid  10  according to the sixth embodiment has a lid body  100 , a tab  200  fixed to the lid body  100 , and a sliding member  300 I. The sixth embodiment does not have a rivet for rotatably supporting the sliding member as in the fourth and fifth embodiments. 
     The sliding member  300 I according to the sixth embodiment is attached to the tab  200  in a circumscribing manner around one linear section  251  of linear sections on both sides across the finger hooking ring  250 . The sliding member  300 I has a rectangular plate-like member and is attached to the linear section  251  by applying a bending process to the plate-like member. While the bending process of the sixth embodiment is performed so that leading ends of both ends of the plate-like member come into contact with each other, a gap may be formed between the leading ends. While the bending process of the sixth embodiment is applied to the sliding member  300 I from a front surface side toward a rear surface side (the lid body  100  side) of the tab  200 , the bending process may be applied from the rear surface side toward the front surface side. According to the configuration described above, the sliding member  300 I can be caused to slide along the linear section  251 . 
     A portion in the sliding member  300 I of the sixth embodiment which is sandwiched between the lid body  100  and the tab  200  functions as an insertion section  310 I. 
     When the sliding member  300 I of the can lid  10  according to the sixth embodiment configured as described above is caused to slide in a direction indicated by an arrow S in  FIG. 19 , the insertion section  310 I is caused to come into contact with the protruding section  130 I provided on the lid body  100  and subsequently run on and be in sliding contact with the protruding section  130 I. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. 
     As described above, the sixth embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the sixth embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 I. Since a range of motion of the sliding member  300 I of the sixth embodiment is narrow, a plate-like section  380 I which extends toward the protruding section  130 I as shown in the bottom-right side in  FIG. 19  may be provided to ensure that the sliding member  300 I runs on the protruding section  130 I. The sliding member  300 I of the sixth embodiment is attached to the linear section  251  which extends linearly. However, some tabs have a finger hooking ring with both sides thereof extending in curved lines. Even in this case, as long as a width of the portion extending in a curved line is constant, a similar sliding member to that of the sixth embodiment may be caused to slide and move, hence a similar configuration to the sixth embodiment may be adopted. 
     Seventh Embodiment 
       FIG. 20  shows a seventh embodiment.  FIG. 20  is a plan view of a can lid according to the seventh embodiment. It should be noted that a sectional view of a part near a sliding member is also shown to the right of the plan view.  FIG. 20  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 20  shows a state where a sliding member  300 J is at its initial position. 
     As shown in  FIG. 20 , the can lid  10  according to the seventh embodiment has a lid body  100 , a tab  200  fixed to the lid body  100 , and a sliding member  300 J. The seventh embodiment does not have a rivet for rotatably supporting the sliding member as in the fourth to sixth embodiments. 
     The sliding member  300 J according to the seventh embodiment is attached to the tab  200  in a circumscribing manner around both linear sections  251  and  252  on both sides of the tab  200 . The sliding member  300 J has a rectangular plate-like member and is attached to the tab  200  by applying a bending process to the plate-like member. While the bending process of the seventh embodiment is performed so that a gap is formed between leading ends of both ends of the plate-like member, the leading ends may come into contact with each other. While the bending process of the seventh embodiment is applied to the sliding member  300 J from a front surface side toward a rear surface side (the lid body  100  side) of the tab  200 , the bending process may be applied from the rear surface side toward the front surface side. According to the configuration described above, the sliding member  300 J can be caused to slide along the tab  200 . 
     A portion in the sliding member  300 J of the seventh embodiment which is sandwiched between the lid body  100  and the tab  200  functions as an insertion section  310 J. 
     When the sliding member  300 J of the can lid  10  according to the seventh embodiment configured as described above is caused to slide in a direction indicated by an arrow S in  FIG. 20 , the insertion section  310 J is caused to come into contact with the protruding section  130 J provided on the lid body  100  and subsequently run on and slide against the protruding section  130 J. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This form a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. 
     As described above, the seventh embodiment can achieve similar effects to the first embodiment. A rotation-stopping protrusion of the seventh embodiment that restricts movement of the tab  200  in the rotation direction can be used as the protruding section  130 J. A plate-like section which extends toward the protruding section  130 J may be provided to ensure that the sliding member  300 J runs on the protruding section  130 J in the seventh embodiment as in the sixth embodiment. 
     Eighth Embodiment 
       FIG. 21  shows an eighth embodiment.  FIG. 21  is a plan view of a can lid according to the eighth embodiment. It should be noted that a side view (a view from a left side in the plan view) of a part near a sliding member is also shown below the plan view.  FIG. 21  shows main structures of the lid body and the tab only in a simplified manner.  FIG. 21  shows a state where a sliding member  300 K is at its initial position. 
     As shown in  FIG. 21 , the can lid  10  according to the eighth embodiment has a lid body  100 , a tab  200  fixed to the lid body  100  and a sliding member  300 K. 
     The sliding member  300 K according to the eighth embodiment is rotatably provided with respect to the tab  200 . More specifically, the sliding member  300 K according to the eighth embodiment has a shaft  370 K to be inserted to a through-hole  260  provided in the tab  200 , an insertion section  310 K fixed to the side of one end of the shaft  370 K, and a knob  380 K fixed to the side of another end of the shaft  370 K. According to this configuration, the insertion section  310 K can be caused to rotate (slide) by rotating the knob  380 K in a direction indicated by an arrow R. 
     When the insertion section  310 K of the can lid  10  according to the eighth embodiment configured as described above is caused to slide by rotating the knob  380 K, the insertion section  310 K is caused to come into contact with the protruding section  130 K provided on the lid body  100  and subsequently run on and be in sliding contact with the protruding section  130 K. Thus, the rear end  230  of the tab  200  moves in a direction in which the rear end  230  separates from the surface of the lid body  100  using the first rivet  120  as a fulcrum. This forms a gap between the rear end  230  and the lid body  100  in a similar manner to the first embodiment. 
     As described above, the eighth embodiment can achieve similar effects to the first embodiment. A protruding section may be provided on the tab  200  instead of on the lid body  100  in the eighth embodiment as in the first embodiment. The insertion section  310 K may be configured to have different heights in a thickness direction of the insertion section  310 K between a leading end side and a rear end side in a slide direction as in the first modification shown in  FIG. 10 . 
     (Note) 
     The above described respective embodiments are examples which relate to a partially-open type can lid provided in a beverage can. However, the can lid according to the present invention may be applied to a full aperture-type can lid provided in food cans and the like.