Lids, containers and combinations thereof, and containers with attached lids

Abstract

The present invention provides a lid that allows for easy and hygienic opening and closing of a drinking spout. The lid is formed to open and close the opening of a container and has a top surface that covers the opening when the lid is closed. The top surface has a small cover piece and an opening that is formed when the small cover piece is pulled up. A joint portion is formed near the front end of the small cover piece to engage with one end of a pull tab member, and the pull tab member has a pinch portion formed at the other end.

Description

[Technical Field]

[0001] This invention relates to a lid, a container and a combination of lids, and a container with a lid. [Previous Technology]

[0002] Background Technology

[0003] In the past, it has been widely practiced to serve food in containers with lids on. In recent years, for example, convenience stores have widely adopted this new method of serving beverages such as coffee. When the food or drink contained in such a container (hereinafter referred to as "contents") is a beverage such as coffee, the buyer will hold the lidded container and tilt it to drink the contents. Therefore, an opening, also called a drinking spout, is usually formed on the lid to allow the contents to flow out when the container is tilted. However, if the drinking spout is simply formed as an opening, there is a concern that dust or other contaminants may enter the container through the drinking spout, and it cannot be said to be necessarily hygienic. Therefore, it is often configured such that the drinking spout is not opened on the lid before use, but only when the user drinks the contents.

[0004] Examples of such lids include those disclosed in Patent Documents 1 and 2. Patent Document 1 discloses a lid with side walls and a top cover portion, and a tab is formed in the top cover portion. This lid is configured such that when the user pinches the tab and pulls it up, a bell-shaped or gourd-shaped hole is opened to form a drinking spout. Patent Document 2 discloses a beverage cup lid with an opening (drinking spout) formed on the top surface (top cover portion), and a small cap for closing or opening the opening. Furthermore, the small cap has a protrusion, and is configured to maintain the small cap in an open state by engaging the protrusion with a recess on the top surface. Prior Art Documents Patent Documents

[0005] Patent Document 1: International Publication No. 2016 / 069755; Patent Document 2: Japanese Patent Application Publication No. 2008-062952

[0006] However, the caps disclosed in Patent Documents 1 and 2 have the following problems: it is difficult to smoothly perform the action of directly pinching the pull tab or small cap to open the drinking spout, and the action of inserting the pull tab into the pull tab hole or fitting the protrusion of the small cap with the concave part of the top surface, and it is very difficult to perform the action of opening the drinking spout. Although this problem can likely be solved by designing the structure and shape of the cap itself, there is another problem in this case that the structure and shape of the cap itself must be complicated. In addition, since the pull tab or the protrusion that serves as a pinching member is directly formed on the top cover of the above-mentioned cap, when the user opens the drinking spout, he has to directly contact the cap, which also poses a hygiene problem. In addition, in this conventional cap, once the drinking spout is opened and then closed, it is necessary to touch the pull tab or small cap with a finger. Therefore, after closing the drinking spout, the surface touched by the finger will be on the side that is in contact with the beverage, which still poses a hygiene problem. [Summary of the Invention]

[0007] The present invention was made in view of such problems, and its object is to provide a lid, a combination of container and lid, and a container with a lid that can be opened and closed simply and hygienically with a drinking spout on the lid.

[0008] The present invention is based on the following (1) to (16). (1) A lid body formed in such a way that it can open and close the mouth of a container, the lid body having a top surface portion formed to cover the mouth of the container when the container is sealed while it is mounted on the container, the top surface portion having a small cover piece and an opening formed when the small cover piece is pulled up, the lid body having a pull tab member that engages with the small cover piece, a joint portion that engages with one end of the pull tab member on the small cover piece, and a pinch portion formed at the other end of the pull tab member; (2) A lid body having a joint area that engages with the periphery of the mouth of a container, the lid body having a shape that covers the mouth of the container when engaged with the container, having a small cover piece, a pull tab member that engages with the small cover piece, and an opening formed when the small cover piece is pulled up, the small cover piece being disposed inside the joint area, and one end of the pull tab member engaging with the small cover piece. When the joint between the aforementioned one end and the aforementioned portion near the front end is defined as the joint, the aforementioned pull tab member has a pinching portion formed at the other end of the pull tab member; (3) In the cover body described in (1), the aforementioned pull tab member has a retaining piece formed between the aforementioned joint and the aforementioned pinching portion, and is configured such that when the aforementioned pinching portion is pinched to open the aforementioned small cover, the retaining piece protrudes from the aforementioned pull tab member, and an insertion portion for inserting the protruding retaining piece is formed on the aforementioned top surface, and is configured such that the retaining piece can be inserted into the aforementioned insertion portion to maintain the aforementioned small cover in an open state; (4) In the cover body described in (2), the aforementioned pull tab member has a retaining piece formed between the aforementioned joint and the aforementioned pinching portion, and is configured such that when the aforementioned pinching portion is pinched to open the aforementioned small cover, the retaining piece protrudes from the aforementioned pull tab member, and an insertion portion for inserting the protruding retaining piece is formed, and is configured such that the retaining piece can be inserted into the aforementioned insertion portion to maintain the aforementioned small cover in an open state; (5) In the cover body described in (3) or (4) above, the pinching portion is formed in such a way that it stands upright when the retaining piece is inserted into the insertion portion; (6) In the cover body described in any one of (3) to (5) above, the retaining piece is formed in such a way that it protrudes from the pinching portion side toward the joint portion side; (7) In the cover body described in any one of (3) to (6) above, the insertion portion has a main portion for inserting the retaining piece and an auxiliary portion that intersects with the main portion; (8) In the cover body described in any one of (3) to (7) above, the pull tab member has a pattern that imitates a human expression on the pinching portion; (9) In the cover body described in (8) above, the pattern changes three-dimensionally before and after the retaining piece protrudes;(10) In the cover body described in (2) above, it has an exposed surface when engaged with the container, at least a portion of the outer periphery of the small cover extends along the inner edge of the engagement area and is formed further outward than the intersection of the exposed surface and the extended surface of the inner periphery of the container when engaged with the container; (11) In the cover body described in any one of (1) to (10) above, it has a counter surface opposite to the outer periphery end face of the small cover when the small cover is closed, and when the small cover is opened from the closed state, at least a portion of the outer periphery end face rubs against the counter surface; (12) In the cover body described in any one of (1) to (11) above, a window is formed on the top surface; (13) In the cover body described in any one of (1) to (12) above, the top surface has a raised portion of at least a portion of the top surface. (14) In any one of the above-mentioned (1) to (13), the lid is formed of a paper material; (15) A combination of a container and a lid, comprising a container having a mouth and a lid as described in any one of the above-mentioned (1) to (14); (16) A container with a lid, comprising a container having a mouth and a lid as described in any one of the above-mentioned (1) to (14), wherein the mouth of the container is covered by the lid. Effects of the invention;

[0009] According to the present invention, by pinching the gripping tab of the pull tab member and pulling it up, the small cover piece engaged with the pull tab member can be easily opened. Furthermore, when a retaining tab is formed on the pull tab member and an insertion portion is formed on the top surface, by inserting the retaining tab formed on the pull tab member into the insertion portion formed on the top surface while the small cover piece is pulled up by pinching the gripping portion of the pull tab member, the small cover piece can be kept open, i.e., the opening portion is formed in an open manner. Therefore, according to the cover body of the present invention, the action of opening the opening portion can be performed without the user directly contacting the small cover piece. Further, according to the present invention, when a retaining tab is formed on the pull tab member and an insertion portion is formed on the top surface, the action of keeping the small cover piece open can be performed smoothly, and the small cover piece can be easily opened and closed. In addition, according to the cover body of the present invention, the contents can be consumed while maintaining a very hygienic condition. Furthermore, even when the opening is closed again, the small cover can be closed by operating the pull tab mechanism until the opening is completely closed. This reduces the amount of residue or other contaminants that often adhere to the small cover due to heat or come into contact with the user's fingers, thus minimizing user discomfort. Additionally, since the small cover can be opened and closed simply by operating the pull tab mechanism, it is not cumbersome for the user and allows for comfortable use.

Implementation Method

[0011] Hereinafter, the lid of the present invention will be described in detail based on the accompanying drawings. Furthermore, regarding the lid of the present invention, examples of lids used for various beverage containers (cups), such as coffee cups, will be given for description, but the invention is not limited to lids for beverage containers; it can also be used as a lid for containers holding food other than beverages. Additionally, the lid of the present invention can also be applied to containers capable of holding various items other than food, such as bolts or nuts, or other items besides the aforementioned parts. Further, regarding the lid of the present invention, examples of lids with a circular shape in top view will be used for description, but the lid is not limited to a circular shape in top view; it can also be applied to lids of various shapes other than circular, such as elliptical, rectangular, triangular, or other polygonal shapes, rounded rectangles, and rounded polygons.

[0012] Furthermore, in this description, a type of lid that can fit into a container is described as the first embodiment, and a type of lid that does not fit into a container is described as the second embodiment. In this specification, structures that have substantially the same features even if the embodiments differ are indicated by the same reference numerals, and detailed descriptions of these structures are omitted.

[0013] (First Embodiment) As shown in Figures 1 to 6, the cover 1 of the first embodiment includes a top cover 2 and a side wall 3. The side wall 3 is formed into a cylindrical or annular shape by joining the two ends of a paper material. The side wall 3 has an upper wall 5 and a lower wall 6. In addition, the side wall 3 is formed to taper at the front end from the upper end 3b side to the lower end 3c side. Furthermore, "tapering at the front end" here means that the shape of the outer wall 3a of the side wall 3 tapers at the front end from the upper end 3b side to the lower end 3c side. In addition to including the shape in which the outer wall 3a of the side wall 3 gradually decreases in size from the upper end 3b side to the lower end 3c side, this also includes the shape in which even if a part of the outer wall 3a of the side wall 3 has a locally enlarged bulge or protrusion, or if such bulges or protrusions are formed, the outer wall 3a of the side wall 3 is still formed to taper at the front end. When the outer wall 3a of the sidewall 3 gradually decreases in size from the upper end 3b to the lower end 3c, in addition to the shape where the outer wall 3a of the sidewall 3 gradually decreases in size in a straight line from the upper end 3b to the lower end 3c, it can also be a shape where the size gradually decreases in a curved line, or a shape where a step difference 3d is formed between the upper end 3b and the lower end 3c (see Figure 6, etc.). Furthermore, even if a part of the sidewall 3 is not formed into a straight cylindrical shape or an annular shape with a tapering front end, the shape where the outer wall 3a of the sidewall 3 as a whole is tapering at the front end is also included in the concept of "tapering at the front end". That is, the concept of "tapering at the front end" here means that as long as the shape of the outer wall 3a of the sidewall 3 is a shape where the entire sidewall 3 tapers at the front end, it is included even if a part of the outer wall 3a is formed into a shape different from the tapering at the front end.

[0014] The top cover 2 has a top surface 2a and a raised portion 4. The top surface 2a is a portion formed in the central part of the top cover 2, serving as the main body of the top cover. When sealing the opening 102 of the container 101 as shown in FIG. 9, it is sized and shaped to contact at least a portion of the edge portion 103 formed around the periphery of the opening 102 and to cover the opening 102. The top surface 2a includes a main body 2a1 having an opening 12 and a small cover plate 13. The small cover plate 13 is formed in a manner that allows it to be opened and closed. When mounted on the container 101, the top surface 2a is located above the opening 102, and the opening 102 is covered by the main body 2a1 and the small cover plate 13. The raised portion 4 is a portion formed around the periphery of the top surface 2a, and is formed to stand upright from the periphery of the top surface 2a. The top surface 2a and the raised portion 4 may also be formed separately, but from the viewpoint of manufacturing efficiency and the airtightness of the cover 1, it is preferable to form them as a single piece. When the top surface 2a and the upright portion 4 are integrally formed in the top cover portion 2, any conventionally known method can be used for forming. However, from the viewpoint of ease of forming the top cover portion 2, it is preferable to form the top surface 2a and the upright portion 4 by bending. That is, the upright portion 4 is preferably formed by bending around the periphery of the top surface 2a.

[0015] The top cover 2 and the side wall 3 are integrated by joining the outer surface 4b of the upright portion 4 of the top cover 2 with the inner surface 5a of the upper wall 5 of the side wall 3. As shown in FIG9, an engaging portion 7 is formed on the inner surface 6a side of the lower wall 6 of the side wall 3. This engaging portion 7 is shaped to engage with the edge portion 103 (formed as a curled portion in FIG9) provided on the opening 102 formed on the container 101. The engaging portion 7 can be formed in any shape, as long as it can engage with the edge portion 103 of the container 101. For example, it can be formed as a straight, tapered shape as shown in FIG1, or the engaging portion 7 can be formed by bulging out the lower wall 6 in accordance with the shape of the edge portion 103. Alternatively, the engaging portion 7 can be formed by forming an inwardly protruding protrusion on the inner surface 6a side of the lower wall 6, or by forming the previously described protrusion as part of the engaging portion 7. Thus, when the engaging portion 7 is formed by forming an inwardly protruding protrusion on the inner surface 6a, it can be formed continuously relative to the inner surface 6a, or the protrusion can be formed intermittently by alternating between portions with and without protrusions. Furthermore, when the protrusion is formed intermittently, the protruding size or length of each protrusion can be the same or different.

[0016] The engaging portion 7 can also be formed by pressing the inner circumferential surface of the lower wall 6 of the side wall 3. Especially when the engaging portion 7 is formed into an annular groove, by pressing the inner circumferential surface of the lower wall 6, the step difference at the joint of the engaging portion 7 formed on the lower wall 6 of the side wall 3 formed by joining the two ends of rectangular or fan-shaped paper materials can be reduced, thereby making it difficult to form a gap between the cover 1 and the container 101, and improving the airtightness of the cover 1 when sealing.

[0017] In the cover 1 of this embodiment, the sidewall 3 is formed in a cylindrical or annular shape by joining the two ends of a fan-shaped blank (not shown) whose arc length on the upper end 3b side is longer than the arc length on the lower end 3c side. Therefore, the sidewall 3 is formed in such a way that the side surface is formed as a tapering shape (inclined shape in the direction of arrow a in FIG6) from the upper end 3b side toward the lower end 3c side (towards the opening 102 of the container 101), and the inner dimension of the lower end side of the engaging part 7 is smaller than the inner dimension of the upper end side of the engaging part 7.

[0018] In the cover 1 of this embodiment, since the sidewall 3 is formed in an inclined shape that tapers towards the front end from the upper end 3b side to the lower end 3c side, the stackability of multiple cover bodies 1 is excellent when stacked as shown in FIG11. That is, regarding the cover 1 of this embodiment, by stacking multiple cover bodies 1 vertically, it is possible to store or transport them in a smaller space, thereby reducing the cost of storage or transportation. The sidewall 3 is not limited to the entire side of the outer wall 3a being formed in an inclined shape; only a part of the sidewall 3, such as the upper end 3b side or the lower end 3c side of the sidewall 3, may be formed in an inclined shape. In addition, different inclination angles may be formed on the upper end 3b side and the lower end 3c side of the sidewall 3. Furthermore, the cover 1 of this embodiment may also be constructed as a non-inclined cylindrical or annular shape by forming the sidewall 3 in a wraparound shape, that is, an annular or cylindrical shape surrounding the top surface 2a of the top cover 2, using rectangular paper material. Furthermore, by using a fan-shaped blank made of paper material to form the sidewall 3, it can also be configured to be inclined in the opposite direction to that shown in FIG11, etc. However, it is preferable that the sidewall 3 is not inclined, or configured as shown in FIG11, etc., to be inclined at the front end to taper along the inclination angle of the sidewall 104 of the container 101. In this case, since the sidewall 3 is formed into an annular or cylindrical shape in which the side of the outer wall 3a is inclined from the upper end 3b side to the lower end 3c side to taper at the front end, the stackability of the lid 1 is improved when multiple lids 1 are stacked. In addition, by forming the sidewall 3 as described above, the sealing and airtightness relative to the container 101 can be improved when the lid 1 is fitted to the container 101 to seal the opening 102 of the container 101. Furthermore, from the viewpoint of further improving the stackability of the lid 1, it is preferable to form a step 3d on the outer surface of the sidewall 3. By forming a step 3d on the outer surface of the side wall 3, the intrusion of the lower wall 6 of the top-mounted cover into the space surrounded by the upper wall 5 of the cover 1 below it during stacking can be significantly reduced, and the intrusion of the lower wall 6 is limited by the inner surface of the upper wall 5. Therefore, when stacking multiple covers 1, more covers 1 can be stacked in a smaller space. This allows for an increase in the number of stackable covers 1, for example, when the covers 1 are housed in a box of fixed height such as a shipping container or packaging box. As a result, logistics costs such as those in transporting the covers 1 can also be reduced.

[0019] The joining of the two ends of the blank formed by the paper material forming the sidewall 3 in the cover 1, and the joining of the upright portion 4 of the top cover 2 with the sidewall 3, can be performed by conventionally known joining methods. Regarding joining methods, examples include conventional adhesives, hot melt adhesives, two-component adhesives, heat sealing, ultrasonic bonding, high-frequency bonding, etc., but from the point of view of manufacturing efficiency, it is preferable to form the joining surface of the upright portion 4 of the top cover 2 and the sidewall 3 with a heat-sealing material and join them by heat sealing.

[0020] Figure 9 shows the state where the lid 1 is placed on the container 101, sealing the opening 102 of the container 101, and Figure 10 shows the state where the lid 1 is placed on the container 101 halfway through. In this embodiment, the lid 1 is formed such that the engaging part 7 engages with the edge 103 of the container 101. In this embodiment, the lid 1 is formed such that when the engaging part 7 engages with the edge 103 of the container 101, the lower end 8 of the lower wall 6 does not contact the side wall 104 of the container 101. The lid 1 can not only seal the container 101 with high airtightness, but also can be easily removed from the container 101 due to the elasticity of the lower wall 6. Furthermore, when the lid 1 is installed on the container 101, it is configured such that the lower end 8 of the lower wall 6 does not contact the side wall 104 of the container 101. Therefore, when the lid 1 is removed from the container 101, by placing fingers or the like on the lower end 8 of the lower wall 6 and pulling it up, the engagement between the edge 103 of the opening 102 of the container 101 and the engaging portion 7 of the lid 1 is released. Moreover, by further pulling the lid 1 upwards, it is easier to remove the lid 1 from the container 101.

[0021] The lid 1 has a structure in which a locking portion 7 is formed on the lower wall 6 of the side wall 3, which is formed in a ring or cylindrical shape to make the paper material wrap around it, and engages with the opening 102 of the container 101. In addition, the lower wall 6 of the side wall 3 with the locking portion 7 is more elastic than the case where the lower wall 6 of the side wall 3 is folded over to engage with the top cover 2. Therefore, even if the diameter of the locking portion 7 of the lid 1 is designed to be smaller than the outer diameter of the edge 103 of the container 101, the lid 1 can reliably engage with the container 101. Furthermore, by designing the diameter of the engaging portion 7 to be smaller than the outer diameter of the edge portion 103 of the container 101, even if the pressure inside the space portion 105 formed in the container 101 increases due to the contents such as coffee or hot liquid products, there is no concern that the lid 1 may easily fall off. The container 101 can be sealed while maintaining a high degree of airtightness, and it can be sealed with a high degree of airtightness by cooperating with the side wall 3, which is formed in a manner that is inclined from the upper end to the lower end and tapers at the front end.

[0022] Furthermore, in the first embodiment, since the lower wall 6 of the side wall 3 is elastic, the lid 1 can reliably close the opening 102 of the container 101 and maintain high airtightness even if there is an error in the size of the opening 102 of the container 101. In addition, since the side wall 3 is inclined from the upper end 3b side to the lower end 3c side to taper at the front end, and the upright part 4 is joined to the inner surface 5a of the upper wall 5 of the side wall 3 to form an integral joint between the top cover 2 and the side wall 3, the joint strength between the outer surface of the upright part 4 of the top cover 2 and the inner surface of the upper wall 5 of the side wall 3 is improved. In particular, the lid 1 shown in FIG1, etc., is formed by folding the upper wall 5 of the side wall 3 toward the inner surface 4a of the upright part 4, and the inner surface 4a of the upright part 4 and the opposing surface 9a of the folded part 9 opposite to the inner surface 4a are joined. Therefore, the joint strength between the top cover 2 and the side wall 3 is further improved. Therefore, even when a load is applied to the lid 1, the lid 1 is unlikely to twist or be twisted, and there is no concern that the locking part 7 and the edge 103 of the container 101 may disengage; even when the internal pressure of the sealed container 101 increases when hot beverages are contained, there is very little concern that the lid 1 may fall off the container 101.

[0023] Generally, the larger the size of the top cover 2 of the cover 1, the more easily the top cover 2 is twisted by the load applied to the cover 1. However, as in the cover 1 of the first embodiment, the side wall 3 is formed to be inclined from the upper end 3b side toward the lower end 3c side in a way that tapers at the front end. An upright part 4, which is formed in an expanding inclined shape, is joined to the inner surface of the upper wall of the side wall 3, and the upright part 4 is further joined to the folding part 9. By setting this structure, even in the case of a large cover 1, the concern that the cover 1 may fall off the container 101 due to the load applied to the cover 1 is reduced. The lid 1 maintains a reliable seal by making the dimension between the lower engagement point 10 of the joint between the upright portion 4 of the top cover 2 and the upper wall 5 of the side wall 3 (the diameter of the lower engagement point 10 in the case of a circular top cover 2) larger than the dimension between the lower ends 8 of the locking portion 7 (the inner diameter of the lower end of the locking portion 7 in the case of a circular top cover 2). In this embodiment, the lid 1 has a protruding wall 121 formed on the upper side of the top cover 2 at the joint between the upper wall 5 of the side wall 3 and the upright portion 4 of the top cover 2. This protruding wall can be used as a mouth-touching part when the contents of the container 101 are beverages such as coffee, and can also be used as an overflow prevention wall to prevent beverage spillage.

[0024] Container 101 is not limited to containers with sloping sidewalls 104, such as coffee cups or instant noodle containers, but can also be cylindrical containers such as nut jars. The lid 1 can be used with various containers such as paper containers, plastic containers, foamed plastic containers, and metal cans, and is not limited to containers for holding liquids; it can also be used as a lid for containers for dry foods or non-food containers. Furthermore, in addition to being used for containers such as coffee cups, instant noodles, and nut jars, the lid 1 can also be used as a lid for containers for soup, yogurt, ice cream, various dishes, or bento boxes, but is not limited to food containers; it can be used as a lid for all types of containers.

[0025] In the lid 1 of this embodiment, where the sidewall 3 is formed into an inclined shape that tapers towards the front end from the upper end 3b side to the lower end 3c side, the inclination angle α of the sidewall 3 of the lid 1 (see FIG. 9) and the inclination angle β of the sidewall 104 of the container 101 (see FIG. 9) can be the same or different. In different cases, the inclination angle α of the sidewall 3 can be greater than or less than the inclination angle β of the sidewall 104 of the container 101. However, when the inclination angle α is less than the inclination angle β (when the inclination is larger), the fitting force of the lid 1 to the container 101 becomes higher, and the airtightness is further improved. In order to improve the airtightness of the lid 1, the size of the inclination angle α of the sidewall 3 of the lid 1 relative to the inclination angle β of the sidewall 104 of the container 101 can be arbitrarily changed according to the size of the container 101 (the size of the lid 1), etc. In addition, in the case of non-circular containers such as polygonal containers, by changing the inclination angle α of the side wall 3 of the lid 1 according to the shape difference of the container part into which the lid 1 is embedded, it is also possible to prevent changes in airtightness due to differences in the container part.

[0026] The cover 1 of the above embodiment is formed such that the upper wall 5 of the side wall 3 and the upright portion 4 of the top cover 2 are at the same height. However, the upper wall 5 of the side wall 3 and the upright portion 4 of the top cover 2 are not limited to being formed at the same height. Either the upper wall 5 of the side wall 3 or the upright portion 4 of the top cover 2 may be shorter than the other.

[0027] The paper material constituting the side wall 3 of the cover body 1 includes, in addition to the so-called paper obtained by taking the pulp of fiber raw material onto a wire and drying and pressing it to form a sheet, the so-called air-laid sheet obtained by laminating open fiber raw material (such as crushed pulp obtained by crushing raw material sheets composed of pulp fibers, etc. using a pulverizer) with airflow and fixing the fibers of the laminated fiber body to each other with an adhesive, and the so-called paper made by gluing plant fibers and other fibers, chemical fiber paper, synthetic paper, water-resistant paper, coated paper, alternative paper, parchment paper, wool paper, glass fiber paper, stone paper, ceramic paper, etc., and paper obtained by stacking multiple sheets of these papers. As a paper material, in addition to being composed solely of pulp, it may also contain non-pulp fibers such as natural fibers, synthetic fibers, and recycled fibers. However, it is preferable to contain at least 50% by mass of pulp, more preferably at least 70% by mass, further preferably at least 80% by mass, and especially preferably at least 100% by mass of pulp. The paper material can also utilize films or nonwoven fabrics made of synthetic or natural resins, wood-based materials such as wood foil, or even composite materials with materials such as aluminum foil. However, when it is a composite material, the composite material as a whole preferably contains at least 50% by mass of pulp, especially preferably at least 80% by mass of pulp. Since a higher pulp content makes the paper material more biodegradable, this is preferable.

[0028] As pulp, examples include wood pulp, non-wood pulp, waste paper pulp, synthetic pulp, etc. More specifically, the following pulps can be selected from one or more of the following: groundwood pulp (GP), stone-ground wood pulp (SGP), refined groundwood pulp (RGP), pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP), etc. (MP), chemimechanical pulp (CGP), semi-chemical pulp (SCP), bleached hardwood sulfate pulp (LBKP), bleached softwood sulfate pulp (NBKP), etc. (KP), alkaline pulp (AP), sulfite pulp (SP), dissolving pulp (DP), etc. (CP), synthetic pulps made from nylon, rayon, polyester, polyvinyl alcohol (PVA), etc., slag pulp (TP), shredded cloth pulp, straw pulp, Spanish straw pulp, bagasse pulp, bamboo pulp, kenaf pulp, etc., etc., and auxiliary pulps such as bast pulp, etc., made from kapok, flax, hemp, jute, Manila hemp, ramie, etc. The pulp can be made from coniferous wood pulp such as red pine, Sakhalin fir, spruce, Douglas fir, hemlock, and spruce; hardwood pulp such as beech, oak, birch, eucalyptus, poplar, and alder; wood pulp such as mixtures of coniferous and hardwood pulps; non-wood pulp such as kenaf, bagasse pulp, bamboo pulp, grain pulp, straw pulp, abaca pulp, and cotton pulp; and waste paper pulp. Because coniferous wood pulp has longer fibers than hardwood pulp, paper materials made from coniferous wood pulp and other pulps with longer fiber lengths exhibit increased fiber entanglement. Furthermore, pulverized pulp obtained by pulverizing raw material sheets made from coniferous wood pulp also exhibits increased strength due to the longer fiber lengths compared to pulverized pulp obtained from pulverized hardwood pulp raw material sheets, thanks to the increased fiber entanglement. Moreover, it is preferable to use biodegradable pulp among the aforementioned pulps.

[0029] The paper material is preferably water-resistant, but water-resistant paper or other materials pre-imposed with water resistance may also be used, or a material with a coating on at least the container-side surface of the paper material may be used. The coating may be applied by film application or by coating agent application.

[0030] As the resin forming the coating, resins such as polystyrene, polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, cyanoacrylate, epoxy resin, polyacrylic acid resin, polymethacrylic acid resin, nylon, polycarbonate; polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, starch resins such as esterified starch, cellulose acetate, polyvinyl succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbon) Naturally degradable resins or mixtures thereof, such as poly(ethylene terephthalate / succinate), poly(butylene adipate / terephthalate), and poly(tetramethylene adipate / butylene terephthalate); naturally degradable biopolymer resins or mixtures thereof; copolymers of monomers constituting the above resins, such as fluoropolymers, silicone resins, UV-curable resins, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-propylene copolymers, ethylene-propylene-butadiene copolymers, acrylic-styrene copolymers, styrene-butadiene copolymers, and acrylonitrile-butadiene-styrene copolymers; natural resins; paraffin wax; gelatin; celluloid; and polymethylpentene. The coating is preferably made of naturally degradable resins such as polylactic acid, polycaprolactone, polyhydroxyalkanoates, and starch-based resins, naturally degradable biopolymer resins, and natural resins, or formed from these.

[0031] As a naturally degradable resin, examples include natural resins, naturally degradable plastics, or bio-plastics. Examples of naturally degradable plastics and bio-plastics include, for example, starch resins such as polycaprolactone, polyhydroxyalkanoates, polyhydroxybutyrate, polylactic acid, esterified starch, cellulose acetate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(ethylene terephthalate / succinate), poly(butylene adipate / butylene terephthalate), poly(tetramethylene adipate / butylene terephthalate), etc., or mixtures of naturally degradable resins.

[0032] In addition, biodegradable resins may also contain lubricants such as stearamide, fatty acid esters, fatty acid metal salts, fatty acids, oils, and glycerol fatty acid esters; stabilizers such as triphenyl phosphate, phthalic anhydride, tributyl phthalate, and acetic anhydride; inorganic materials such as titanium dioxide, kaolin, mica, bentonite, diatomaceous earth, magnesium oxide, aluminum silicate, calcium carbonate, calcium hydroxide, and shell powder; surfactants such as advanced fatty acid amides, nonionic surfactants, and glycerol fatty acid esters; foaming agents such as citric acid, sodium bicarbonate, and butane; antistatic agents, hot melt adhesives, and other materials, as well as additives listed in the positive list of the Japan Bioplastics Association.

[0033] In addition, "natural degradability" refers to the property of being decomposed in the air, soil, or water by microorganisms, ultraviolet radiation, climate change, etc., thereby reducing environmental impact. Furthermore, the lid is not limited to the contents of the container in which it is installed, and can be used to seal containers that can hold all kinds of contents.

[0034] The top cover 2 of the lid 1 can be made of the same paper material as the side wall 3, but it can also be made of film or sheet material in addition to paper material. If the top cover 2 is made of film or sheet material, it has higher flexibility than if the top cover 2 is made of paper material, so the lid 1 is easier to insert into the container 101. In addition, if it is made of transparent film or sheet material, the contents of the container 101 can be easily visually confirmed when it is installed on the container 101. As a film or sheet, materials such as polyvinyl chloride, polyvinylidene chloride, polyurethane, polyethylene terephthalate (PET), olefin resins such as polyethylene or polypropylene, polyvinyl alcohol, acrylic resins such as polyacrylic acid, polymethacrylic acid, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, celluloid, nylon, ethylene-vinyl alcohol copolymer, polymethylpentene, polyvinyl acetate, polylactic acid, polycaprolactone, polyhydroxyalkanoates, starch resins, or composites thereof can be used. However, materials with biodegradability such as polyvinyl acetate, polylactic acid, polycaprolactone, polyhydroxyalkanoates, and starch resins are preferred. In addition, materials obtained by forming an aluminum layer on paper or the like by vapor deposition, or laminates in which an aluminum layer is further formed on the surface of paper or the like and polyethylene, polypropylene, or the like are formed on one or both sides, can also be used. When the top cover 2 is made of film or sheet, if a material that is difficult to heat seal, such as PET, is used, the surface that is joined with the side wall 3 is coated with polyethylene, polypropylene (OPP, CPP, etc.), and heat-sealing can be easily performed.

[0035] When the cap 1 is made of paper, film, or sheet, or when the side of the cap 2 that contacts the opening of the container 101 is made of a heat-sealing material, the cap 2 can be joined to the edge 103 of the container 101 by heat sealing, or the cap 1 can be removed from the container 101 while unsealing during use. This ensures that external air is isolated until the contents of the container 101 are used. When the cap 2 is made of film or sheet, using a material with good air permeability or moisture permeability improves the isolation from external air.

[0036] When the container 101 is sealed by the cover 1 of the first embodiment, firstly, as shown in FIG10, the engaging portion 7 on one end of the cover 1 is inserted into the edge portion 103 of the container 101. Secondly, the engaging portion 7 is gradually inserted into the edge portion 103 towards the opposite side of the cover 1, causing the top cover portion 2 to tilt up. The engaging portion 7 on the other end of the cover 1 is then inserted into the edge portion 103 of the container 101. Thus, the cover 1 can be inserted into the container 101 and sealed as shown in FIG9. The cover 1 of the first embodiment is flexible as a whole, and the lower wall 6 of the side wall 3 is elastic in the wall thickness direction. Therefore, even when the inner dimension of the lower end of the lower wall 6 is smaller than the outer dimension of the opening of the container 101, the cover 1 can be inserted into the container 101, and the container opening (edge ​​portion 103) can be in close contact with the inner surface of the lower wall of the cover 1 and the lower surface of the top cover, thus providing high sealing performance and reliably sealing the container 101. The cover 1 of the first embodiment is not limited to a container with a curled portion, and can be embedded in the container opening to maintain high airtightness.

[0037] Next, the structure of the opening forming part 11 in the top cover 2 will be described. As shown in FIG1, the opening forming part 11 has an opening 12 and a small cover 13. As shown in FIG1, the opening 12 is adapted to be formed inside the main body 2a1 of the top surface 2a. In addition, the small cover 13 is adapted to be formed in the opening 12 of the main body 2a1 so as to open and close freely. In this case, the small cover 13 and the opening 12 are formed in a state where the small cover 13 closes the opening 12 as shown in FIG1 and FIG4, and in a state where the small cover 13 is open and the opening 12 is open as shown in FIG3 and FIG5. The opening 12 constituting the opening forming part 11 is formed in such a way that it connects the inside and outside of the top cover 2 and passes through the surface 2b and the back surface 2c of the top cover 2. This opening 12 is used, for example, to form an inlet and outlet for contents (e.g., beverages or food) in the space 105 of the container 101 when the cover 1 is mounted on the container 101. As shown in Figure 1, the opening forming portion 11 is provided in the top cover portion 2 at a predetermined position offset from the center of the top cover portion 2 in the outward direction. Furthermore, the small cover piece 13 formed in the top cover portion 2 is formed such that one end 13a, located at a predetermined distance away from the center of the top cover portion 2, is a free end, and the other end 13b, located closer to the center than the first end 13a, is a fixed end. In the small cover piece 13, one end 13a is also referred to as the base end near the center of the top surface portion 2a, and the other end 13b is referred to as the front end on the edge side of the top surface portion 2a. The free end 13a is also referred to as the front end, and the position between the front end and the other end 13b (hinge portion 14) that is closer to the front end (i.e., the first end 13a) than the other end 13b is referred to as the "position near the front end" or "near the front end."

[0038] A hinge portion 14 is formed at the other end 13b, and the small cover 13 is formed in such a way that it can be opened and closed via the hinge portion 14. That is, the opening forming portion 11 is configured such that one end 13a rotates around the hinge portion 14 on the other end 13b of the small cover 13 as a fulcrum, and performs an opening or closing action relative to the top cover 2. In addition, the opening forming portion 11 forms an opening portion 12 when the small cover 13 is opened. Furthermore, when the small cover 13 performs the opening and closing action, it is preferable that a bending line 15 is formed on the hinge portion 14 (see Figure 12(g)). The bending line 15 may also be formed on the surface 2b side and / or the back 2c side of the top cover 2. In this way, by forming the bend line 15 on the hinge portion 14, the opening and closing of the small cover 13 can be easily performed with the bend line 15 as a reference. Furthermore, since the other end 13b of the small cover 13 bends at the location where the bend line 15 is formed, it is easy to bend when the hinge portion 14 is bent, i.e., when the small cover 13 is opened, and the bend is neat. In other words, by forming the bend line 15, it is possible to prevent locations other than the location where the bend line 15 is formed from becoming fulcrums and causing the small cover 13 to bend. Moreover, the bend line 15 can be extruded into a linear shape, for example, by stamping. That is, the bend line 15 can be formed by linearly stamping the predetermined location where the bend line 15 is formed using a stamping machine or the like. Since the small cover 13 bends only at the specific location where the bend line 15 is formed, the deviation of the bending position of the small cover 13 can be significantly reduced. Furthermore, regarding the formation of the bend line 15, any previously known method can be appropriately selected and used.

[0039] The opening forming portion 11 is configured such that if the small cover 13 is opened while the cover 1 is mounted on the container 101, the space portion 105 of the container 101 can be visually identified through the opening portion 12. Furthermore, the portion where the opening portion 12 is formed is preferably formed such that when the cover 1 is mounted on the container 101, one end portion 12a of the opening portion 12 (the end portion on the same side as one end portion 13) is located further outward than the inner wall 106 of the container 101.

[0040] The opening forming portion 11 has a bend line 15 at the location where the hinge portion 14 is formed, and a slit line 16 at the location other than the location where the hinge portion 14 is formed. A dotted engagement portion 17 is provided between the slit lines 16. This dotted engagement portion 17 is used to engage the small cover 13 onto the top surface 2a and maintain the opening portion 12 in a closed state. By forming the opening forming portion 11 in this way, it is configured such that the small cover 13 can be maintained in a closed state by the presence of the dotted engagement portion 17 in the state before use, and when pulled or lifted by the pull tab member 21 (described later), the dotted engagement portion 17 is cut off, thereby releasing the engagement at the dotted engagement portion 17.

[0041] In addition, the opening forming portion 11 can be formed as a half-cut portion, in addition to being formed by the slit line 16 and the dotted joint portion 17 as described above. This half-cut portion has a line that can cut along the shape of the small cover piece 13 as a whole (in other words, along the shape of the opening portion 12 as a whole). In the case of forming a half-cut portion, there is no slit line 16 and dotted joint portion 17 as described above, but a slit is formed along the shape of the small cover piece 13 (or the opening portion 12) as a whole. The depth of the slit in this half-cut portion is formed to be thinner than the overall wall thickness of the top cover portion 2, and it does not penetrate between the surface 2b and the back surface 2c of the top cover portion 2 as the slit line 16 does. Furthermore, when using these slit lines 16, dotted joint portions 17 and half-cut portions, in these cover bodies 1, in addition to the case where a half-cut portion is formed in place of the slit line 16 and the dotted joint portion 17, the slit line 16, the dotted joint portion 17 and the half-cut portion can be used separately.

[0042] As shown in FIG1, a stress-reducing portion 18 is formed at the other end 13b where the hinge portion 14 is formed on the small cover 13. This stress-reducing portion 18 is used to reduce the stress generated relative to the force applied when the small cover 13 is pulled up. In the example shown in FIG1, the stress-reducing portion 18 is formed such that, in the part where the hinge portion 14 is formed, it bends in the direction opposite to the direction where the small cover 13 is formed, in a direction that increases the distance between the cut lines 16. The stress-reducing portion 18 is formed such that the end of the other end side of the cut line 16 is at a position deviated from the radial position where the hinge portion 14 is formed, that is, a position that is more radially outward compared to the radial position. By setting the position of the end of the other end side of the cut line 16 in the stress-reducing portion 18 to the above position, the magnitude of the stress applied to that position can be reduced by forming a cut line 16 adjacent to the hinge portion 14. Furthermore, in order to reduce the magnitude of the stress generated at this location, the notch 16 is not formed at the same location as the hinge portion 14, but rather at a location different from the location where the hinge portion 14 is formed. In this way, by forming the stress-reducing portion 18, the stress applied to the other end of the notch 16 can be reduced when the small cover 13 is opened, and the undesirable situation of the top cover 2 cracking or breaking when the small cover 13 is opened can be eliminated.

[0043] Furthermore, as shown in FIG. 6, the cut line 16 can be formed either perpendicularly from the surface 2b and the back surface 2c of the top cover 2, or it can be formed by cutting from the surface 2b of the top cover 2 toward the back surface 2c at a predetermined angle. When the cut line is formed perpendicularly from the surface 2b of the top cover 2 toward the back surface 2c as shown in FIG. 6, the small cover 13 can be opened more easily along the cut line 16. In addition, when the cut line 16 is formed by cutting at a predetermined angle, the beveled cut surface formed on the top cover 2 side and the beveled cut surface formed on the small cover 13 side abut against each other. Therefore, even when attempting to pull up the small cover 13, or when the container 101 is sealed with the cover 1, and the container is pushed from the back side 2c of the top cover 2 towards the surface 2b due to changes in vapor pressure within the space 105, the cut surface on the small cover 13 side and the cut surface on the top cover 2 side will abut against each other, making it difficult to open the small cover 13. Therefore, forming the cover in this way can more effectively prevent the small cover 13 from opening suddenly. Furthermore, when beveled cut surfaces are formed on the top cover 2 side and the small cover 13 side, the cut surface on the top cover 2 side is preferably formed such that the end of the cut surface on the surface side is closer to the center than the end of the cut surface on the back side 2c side. Additionally, the cut surface on the small cover 13 side is preferably formed such that the end of the cut surface on the back side 2c side is closer to the radially outer side than the end of the cut surface on the surface 2b side.

[0044] The opening forming portion 11 can be formed by any method, such as using a Thomson die for punching or a conventionally known method equivalent to that method. Furthermore, in order to form the opening forming portion 11 using the above method, the thickness of the punching blade used during the punching process is preferably 1.0 mm or less. More specifically, it is preferably 0.7 mm or less, and even more preferably 0.4 mm or less. When the thickness of the punching blade is 0.4 mm or less, although a slit line 16 will be formed, due to the characteristics of the cut paper material, it is difficult to form a gap caused by the slit line 16. Therefore, leakage from the slit line 16 can be significantly reduced. In addition, in this embodiment, the shape of the opening portion 12 is formed to correspond to the shape of the small cover plate 13, but the shape of the opening portion 12 is not limited to this shape; it can also be formed to a shape different from the shape of the small cover plate 13. However, in such cases, for example, when a gap is formed between the opening portion 12 and the small cover plate 13, it is preferable to prevent dust and the like from entering the interior of the container 101 through this gap. Therefore, from the viewpoint of ease of molding the cover 1 or eliminating concerns about foreign matter such as dust getting mixed in, the shape of the opening 12 is preferably formed to be the same as the shape of the small cover 13.

[0045] The opening 12 is formed in a manner that allows it to function as a drinking spout. For example, in the case of the lid 1 of a beverage container as described in this embodiment, the drinking spout allows the beverage in the container 101 to flow out of the container 101 when the user drinks from it. In addition, the opening 12 can also function as an insertion port into the space 105 of the container 101, into which an object such as a straw can be inserted.

[0046] As shown in Figure 1, a pull tab member 21 is installed on the small cover plate 13. The pull tab member 21 has a joint portion 22 formed at one end 21a, which engages with the small cover plate 13 near its front end. That is, a joint portion 22 is engaged with one end 21a of the pull tab member 21 near the front end of the small cover plate 13. This joint portion 22 is used to engage with the small cover plate 13 by various methods such as ultrasonic bonding, heat sealing, and adhesive-based bonding. Among the above methods, ultrasonic bonding is preferred from the viewpoint of ease of engagement or bonding strength. The portion on the side where the pull tab member 21 is installed is located offset from the center of the small cover plate 13, further installed at a position on the small cover plate 13 away from the center of the top cover portion 2, and even further installed at the position furthest from the center of the top cover portion 2. That is, the pull tab member 21 is mounted on the small cover plate 13 at a position close to one end 13a, that is, near the front end of the small cover plate 13. In other words, the pull tab member 21 is formed on the small cover plate 13 in a manner that engages with one end of the top cover portion 2. In particular, the joint portion 22 where the small cover plate 13 and the pull tab member 21 engage is preferably formed on the small cover plate 13 at the end 13a, away from the hinge portion 14.

[0047] Thus, on the small cover 13, as long as the pull tab member 21 is engaged at a position near the front end away from the hinge portion 14, the distance can be extended to the point of force application relative to the hinge portion 14 (fulcrum). Therefore, when the pull tab member 21 is lifted, force is applied to the small cover 13 via the pull tab member 21, thereby releasing the engagement at the point-like engagement portion 17 or the half-cut portion, and making the small cover 13 easier to open and close.

[0048] The pull tab member 21 has one end 21a mounted on the small cover plate 13 and another end 21b opposite to the one end 21a. Furthermore, the pull tab member 21 has a pull tab body and a retaining portion 23, and is preferably formed such that the retaining portion 23 can protrude from the pull tab body. In this case, the retaining portion 23 is preferably formed between one end 21a and the other end 21b of the pull tab member 21, and is formed in a claw shape by engraving a cut line 23a on the pull tab member 21 (more specifically, the pull tab body). Moreover, although the retaining portion 23 is formed between one end 21a and the other end 21b, it is preferably formed on the pull tab member 21 near the other end 21b, in other words, at or near the location where the pinching portion 24 described later is formed. The retaining portion 23 is formed in such a way that, when in the state shown in Figures 1 and 4, it has a cut line 23a formed relative to the pull tab member 21 (pull tab body). However, when held by the insertion portion 26 formed on the top cover portion 2, that is, when the retaining portion 23, which is formed in a claw shape in this embodiment, is inserted into the cut line formed on the top surface 2a as the insertion portion 26, it becomes a claw-shaped portion protruding from the pull tab member 21 (pull tab body) toward the surface 2b of the top cover portion 2. In this embodiment, as shown in Figure 1, the shape of the retaining portion 23 is formed such that the front end 23b is triangular and has rounded corners but is sharp overall. However, the shape of the retaining portion 23 is not limited to a triangle. For example, the shape of the retaining portion 23 can be any conventionally known shape such as a semi-circle, a quadrilateral, or an ellipse. That is, the retaining portion 23 can be any shape, as long as it can be inserted into the insertion portion 26 and can maintain the small cover 13 in an open state when inserted into the insertion portion 26, in other words, the opening portion 12 is open. The retaining part 23 formed in this shape is sometimes referred to as a retaining piece. Since the retaining piece is essentially the same concept as the retaining part, the same reference numerals are used below to refer to the retaining part and the retaining piece.

[0049] As described above, the retaining piece 23 is formed as shown in Figures 2 and 3, protruding from the pull tab body of the pull tab member 21 when the small cover 13 is opened by pinching the gripping part 24 (described later). Preferably, the retaining piece 23 is formed so that it protrudes from the side of the pull tab member 21 where the gripping part 24 is formed toward the side where the connecting part 22 is formed. By forming the retaining piece 23 in this way, it is difficult for the retaining piece 23 to fall off the insertion part 26 when inserted, and the open state of the small cover 13, i.e., the state where the opening 12 is formed in an open manner, can be maintained more reliably. Furthermore, to facilitate the protrusion of the retaining piece 23, a fold-in line 23c can be formed on the pull tab member 21. By forming this fold-in line 23c, it is easier to insert the retaining piece 23 into the insertion part 26, and the aforementioned effects can be easily obtained. In addition, the insertion part 26 is formed in such a way that the contents inside the container 101 will not leak or overflow before the holding part 23 is inserted, and is formed through by inserting the holding part 23.

[0050] Furthermore, as shown in Figures 1 and 3, a pinching portion 24 is formed on the other end 21b side of the pull tab member 21. The pinching portion 24 is formed to be wider than the portion on one end 21a where the joining portion 22 is formed, and is configured to make it easier for the user to pinch the pull tab member 21 when opening the small cover 13, easier to pull when opening the small cover 13, and easier to press when closing the small cover 13. In this embodiment, the pinching portion 24 is formed in a curved shape, but the shape of the pinching portion 24 is not limited to a curved shape, and any shape can be used, as long as it is easy for the user to pinch and operate the pull tab member 21. In addition, a display portion 24a is formed on the pinching portion 24. The display portion 24a can also be formed arbitrarily, for example, in this embodiment, it displays the text "OPEN". By forming the display portion 24a, in this embodiment, the user can be informed of the function of the pull tab member 21. Furthermore, the text displayed on the display unit 24a is not limited to the examples described above, and other text may also be used. Additionally, the size of the display unit 24a and the font or color of the text can be arbitrarily chosen.

[0051] Furthermore, the gripping portion 24 is provided with a pattern 24b that imitates a human expression. In this embodiment, as shown in FIG1(a), the pattern 24b is composed of a pattern drawn along the cut line 23a on which the holding portion 23 is formed, and a pattern drawn at a position close to the base end of the cut line 23a. Thus, if the pattern drawn along the cut line 23a is taken as a person's mouth and the pattern drawn at a position close to the base end of the cut line 23a is taken as a person's eyes, a design pattern that looks like a person smiling is formed. In addition, in order to clearly express this pattern, the cut line 23a is omitted in FIG1(b). Furthermore, as shown in FIG3, when the holding portion 23 is inserted into the insertion portion 26 and the small cover 13 is in an open state, the pattern drawn along the cut line 23a remains unchanged, and the pattern drawn at a position close to the base end of the cut line 23a forms a pattern that gives people a different impression from the previously described design pattern due to the gripping portion 24 being erected. That is, the pattern 24b is formed in such a way that it becomes a different expression pattern before and after the retaining piece 23 is protruding. In this case, the pattern 24b undergoes a three-dimensional change before and after the retaining piece 23 is protruding, becoming a pattern with a different expression before the retaining piece 23 is protruding and a pattern with a different expression after the retaining piece 23 is protruding. By forming this pattern 24b, the user's emotions can be soothed and they can feel warm. Usually, such a cover 1 is mostly used without any printing, or with the trademark or manufacturer's logo printed on it, but by providing this pattern 24b, even in the often inorganic state of the cover 1, it can evoke the user's playful mood or soothe their emotions and produce a warm feeling, and achieve a high therapeutic effect. Furthermore, the above-described form of the pattern 24b is merely an example, and any pattern other than the one described above can be used appropriately, and the pattern 24b may not even be formed on the gripping part 24. In addition, in the previous explanation, patterns that imitate human expressions were given as examples of pattern 24b. However, the pattern 24b used is not limited to imitating human expressions. For example, the logo of a store or brand or the name of a product can also be used as pattern 24a, and the pinch part 24 can be colored only.

[0052] Furthermore, the gripping portion 24 is preferably formed so that it stands upright when the retaining piece 23 is inserted into the insertion portion 26. By forming the gripping portion 24 in this way, not only can the visual effect of the above-described pattern 24b be obtained, but the complexity of the insertion action when inserting the retaining piece 23 into the insertion portion 26 can also be greatly reduced, making insertion easier. In addition, when the inserted retaining piece 23 is pulled out of the insertion portion 26, the user can easily grip the pull tab member 21, thereby improving operability.

[0053] Alternatively, the other end 21b can be adhered to the top surface 2a using an adhesive or the like listed above, as needed. This prevents the pull tab member 21 from breaking before use.

[0054] Furthermore, the material forming the pull tab member 21 can be formed by appropriately selecting and using the same material as the material forming the top cover 2 or the side wall 3, such as the aforementioned paper material or other materials. In addition, as materials that can form the pull tab member 21, materials such as wood chips, membrane components, and metal components can also be used. However, when using these components, it is necessary to be able to form the retaining portion 23 and to maintain the retaining portion 23 in the insertion portion 26. That is, the pull tab member 21 can be appropriately selected and any material can be used as long as it is formed in such a way that the user can pull up the small cover 13 by pinching the gripping portion 24 and further retain the retaining portion 23 in the insertion portion 26, and the opening portion 12 can be kept open while the retaining portion 23 is held in the insertion portion 26 in the inserted state.

[0055] Next, the effect of the opening forming portion 11 on the cover 1 of the first embodiment will be explained. First, as shown in FIG8(a), the user pinches the holding portion 24 of the pull tab member 21 in the cover 1 and lifts the other end 21b of the pull tab member 21. At this time, as previously explained, when the other end 21b is engaged with the top cover 2, when the user pinches the other end 21b of the pull tab member 21, the engagement between them is released by peeling the pull tab member 21 off the surface 2b of the top cover 2, and the user lifts it by pinching the holding portion 24 on the other end 21b of the pull tab member 21. Next, as shown in FIG8(b), when the user pinches the holding portion 24 and pulls the pull tab member 21 in the direction B, the small cover piece 13 engaged by the engaging portion 22 on one end 21a of the pull tab member 21 is lifted in the direction C in the figure with reference to the hinge portion 14. At this time, the joint 22 is formed on a part of the small cover 13. More specifically, the joint 22 is formed on the portion of the small cover 13 near the front end. In addition to the joint 22, non-jointed portions are formed on the small cover 13 and the pull tab member 21 at portions where they are not joined. Thus, since the pull tab member 21 is joined close to one end 13a of the small cover 13, considering the hinge 14 as the fulcrum and the joint 22 as the point of force application, the force applied by the user in the B direction via the joint 22 easily causes the small cover 13 to rotate in the C direction and be lifted. Furthermore, if a bend 15 is formed at the location where the hinge 14 is formed, the small cover 13 is more easily lifted in the C direction. Moreover, if the user further pulls the pull tab member 21 in the B direction, the small cover 13 continues to rotate in the C direction around the other end 13b, thereby forming an opening 12. Furthermore, the user can also bend the other end 21b of the pull tab member 21 while pinching the gripping part 24, causing the retaining part 23 to protrude toward the surface 2b of the top cover part 2. Alternatively, the user can bend the other end 21b of the pull tab member 21 without bending it before reaching the insertion part 26, and instead bend it just before inserting the retaining part 23 into the insertion part 26 to hold it in place, thus forming the retaining part 23. Next, as shown in FIG8(c), the user inserts the retaining part 23 into the insertion part 26. By inserting the retaining part 23 into the insertion part 26 in this way, the position of the pull tab member 21 and the position of the opening of the small cover 13 are physically fixed. That is, for example, if an adhesive seal is used to keep the small cover 13 open, especially when the contents are beverages or hot items, the seal on the back side of the small cover 13 will mostly peel off immediately.Therefore, even if an adhesive seal is used to secure the small cover 13, the adhesive strength will gradually weaken over time, and any seal may peel off, causing the small cover 13 to attempt to return to its original position when the opening 12 is closed. If this action of the small cover 13 occurs, for example, when a user brings the surface 2b of the top cover 2 closer to their face to drink a beverage, there is a concern that the small cover 13 will come into contact with the user's nose or face, potentially causing discomfort. However, in the first embodiment, the cover 1 physically secures the pull tab member 21 by holding the retaining portion 23 in place using the insertion portion 26, thus reliably suppressing the small cover 13 from attempting to return to its original position over time and maintaining the opening 12 open. Therefore, even if a user attempts to put the contents of the container 101 into their mouth, the small cover 13 will not come into contact with their face, allowing for comfortable use.

[0056] Furthermore, according to the cover 1 of the first embodiment, since the user operates the holding part 23 to pull up the small cover 13, the small cover 13 can be operated to open or close the opening 12 without contacting the back side of the small cover 13. Therefore, since the user's fingers will not come into contact with, for example, the contents attached to the back side of the small cover 13, it is hygienic and can be operated comfortably when opening the opening 12.

[0057] Furthermore, according to the cover 1 of the first embodiment, by operating the retaining piece 23 held in the state of being inserted into the insertion part 26, the small cover piece 13 can also be moved in the direction of closing the opening part 12 by the small cover piece 13. Therefore, by operating the retaining piece 23, the small cover piece 13 can be opened and closed multiple times easily, and even if the contents of the container 101, such as a beverage, are not consumed in a short time, the small cover piece 13 can be easily closed and the closed state of the small cover piece 13 can be maintained. In addition, since the cover 1 of the first embodiment is formed using paper material, it is possible to provide a cover 1 that can also take into account environmental issues.

[0058] Furthermore, when the small cap 13 is opened in this manner, the opening angle θ of the small cap 13 shown in FIG8(c) is preferably greater than 90°, more preferably greater than 100°, and even more preferably greater than 120°. Additionally, it is more preferably greater than 140°, and most preferably greater than 178° or 180°. By opening the small cap 13 to this angle, it is possible to prevent the small cap 13 from touching the user's nose when the user attempts to drink the contents, thereby significantly reducing the likelihood of user discomfort.

[0059] Figures 12(a) to (f) show examples of the opening forming portion 11. Furthermore, the form in Figure 12(d) is an example of the opening forming portion 11 formed on the cover 1 as previously described, but it is also described here. Specifically, the opening forming portion 11 has the same shape as the small cover 13, and the opening portion 12 also has the same shape when the small cover 13 is open. Here, while the shape of the opening forming portion 11 is described, the small cover 13 and the opening portion 12 are also included in the description. First, the opening forming portion 11 is not limited to the shape previously described; for example, it can be any shape as shown in the variations described later. For example, the opening forming portion 11 shown in Figure 12(a) has dotted joint portions 17 formed in a total of three locations: one on one end side of the opening forming portion 11 that becomes one end 13a, and one on each side midway from one end side to the other end side that becomes the other end 13b. Furthermore, on the other end side, which becomes the other end 13b side, the cut line 16 forming the opening forming portion 11 is formed in such a way that it draws an arc from the other end side toward the first end side. In this modified example, a stress-reducing portion 18 is formed on the other end 13b side of the cut line 16. This stress-reducing portion 18 is formed in an arc shape, and the end of the other end 13b side of the cut line 16 is located above the end of the other end 13b side of the opening forming portion 11. Furthermore, this stress-reducing portion 18 is formed in such a way that it is located on the outer side compared to the opening forming portion 11. By forming the stress-reducing portion 18 in this way, when the small cover 13 is moved to open the opening portion 12, damage to the top cover portion 2 caused by the force applied to the small cover 13 can be prevented.

[0060] The opening forming portion 11 shown in FIG12(b) has the same shape as that in FIG12(a). Moreover, in the opening forming portion 11 shown in FIG12(b), a bending line 15 is formed on the base end side in addition to the cut line 16. In addition, FIG12(c) shows a bending line 31 formed on the front end side of the small cover 13 in addition to the cut line 16. The bending lines 15 and 31 formed in this way are specifically formed to bend the other end 13b side of the small cover 13, which is the opening forming portion 11, when the small cover 13 changes from a flat state (i.e., the state of blocking the opening portion 12) to an upright state (i.e., the state of opening the opening portion 12). In this way, by forming the bending line 15 on the base end side of the opening forming portion 11, the uprighting method or deviation when the small cover 13, which is the opening forming portion 11, changes to an upright state can be effectively suppressed. Furthermore, by forming the bend line 31 on the end portion 13a of the opening forming portion 11, the bend of the top cover portion 2 on which the opening forming portion 11 is formed can be specified. Therefore, when the opening forming portion 11 is moved from a flat state to an upright state, the impact on the end portion 13a of the opening forming portion 11 can be reduced.

[0061] In the opening forming portion 11 shown in FIG12(d), the difference from the shape in FIG12(a) is that the width dimension on the side of one end 13a is larger than the width dimension on the other end 13b. By forming the opening forming portion 11 in this way, not only can the above-mentioned effects be obtained, for example, when the contents of the container 101 contain solids such as ice, it is possible to reliably prevent the potential concern that such solids such as ice may suddenly jump into the user's mouth when the container is used by the user.

[0062] The opening forming portion 11 shown in FIG. 12(e) has a width dimension opposite to that in FIG. 12(d). That is, the opening forming portion 11 differs in that the width dimension on the other end 13b side is larger than the width dimension on the one end 13a side. By forming the opening forming portion 11 in this way, not only can the above-mentioned effects be obtained, for example, when the contents of the container 101 contain solids such as ice, when it is used by the user, the opening forming portion 11 in this example can reliably prevent such solids from suddenly jumping into the user's mouth. The opening forming portion 11 shown in FIG. 12(f) is formed with the stress-reducing portion 18 facing inward. In this way, even if the stress-reducing portion 18 faces inward, since the end of the cut line 16 is located at a different position than the hinge portion 14, damage to the top cover portion 2 can be prevented in the same way as described above.

[0063] Furthermore, the dotted joint 17 is preferably formed at least at the foremost end of one end 13a, which can significantly reduce the following concern: Normally, when the opening forming portion 11 is subjected to the user's force via the pull tab member 21, if the dotted joint 17 is not formed at the aforementioned location, the container 101 will lift up at the point where the user's force is applied, and the contents of the container 101 will leak out from the opening portion 12. In addition, in the configurations shown in Figures 8(a) to 8(c), when the small cover 13 as the opening forming portion 11 is formed, it can be formed either by forming a cut line 16 or by forming a half-cut portion. Alternatively, the small cover 13 as the opening forming portion 11 can also be formed by other means.

[0064] Figures 13, 22, and 23 show variations of the cover 1 according to the first embodiment. In these variations, the structure of the insertion portion 26 differs from the previously described structure. First, regarding the insertion portion 26 of the cover 1 shown in Figure 13, the insertion portion 26 is composed of a main portion 26a and an auxiliary portion 26b. The main portion 26a is the part for inserting the retaining piece 23, and the auxiliary portion 26b is formed in a manner that intersects with the main portion 26a. By forming the insertion portion 26 in this way, as shown in Figure 13(b), when the retaining piece 23 is inserted into the insertion portion 26, since the auxiliary portion 26b is formed, the main portion 26a can easily move in the vertical direction along with the movement of the retaining piece 23. Therefore, the retaining piece 23 can be easily inserted into the insertion portion 26. Furthermore, it is preferable that the auxiliary portion 26b is formed in a manner that intersects with the main portion 26a at a position relative to the main portion 26a where the pull tab member 21 is provided.

[0065] Furthermore, in the cover 1 shown in FIG. 22, the insertion portion 26 is formed by the main portion 26a and the auxiliary portion 26b, which is the same as in the previously described modified example. In addition, in the insertion portion 26 of the cover 1 in this modified example, the main portion 26a and the auxiliary portion 26b are continuously formed, and one end of the auxiliary portion 26b becomes a continuous portion 26c that is continuous with the main portion 26a. Furthermore, in the auxiliary portion 26b, the end opposite to the end that becomes the continuous portion 26c, on the other end side, is formed as an insertion auxiliary portion 26d. This insertion auxiliary portion 26d is formed to make the area surrounded by the main portion 26a and the auxiliary portion 26b of the insertion portion 26 (hereinafter also referred to as the "insertion portion forming area 26e") more easily deform with the insertion of the retaining piece 23 when the retaining piece 23 is inserted into the insertion portion 26. Preferably, the insertion auxiliary portion 26d is formed in a direction different from that of the auxiliary portion 26b, which extends from one end side to the other end side. For example, as shown in FIG22, the shape of the insertion auxiliary portion 26d is preferably formed such that the end of the other end of the auxiliary portion 26b curves inward toward the insertion portion forming region 26e. When the insertion auxiliary portion 26d is formed in this way, the portion of the insertion portion 26 that forms the insertion portion forming region 26e can be more easily deformed with the insertion of the retaining piece 23, and the insertion of the retaining piece 23 can be performed more smoothly. Moreover, the retaining piece 23, when inserted into the insertion portion 26, can be maintained on the back side of the retaining piece 23, in other words, maintained in the state before the use of the pull tab member 21, with the side facing the top surface 2a abutting against the insertion portion 26. Therefore, it is easier to physically maintain the state in which the retaining piece 23 is inserted into the insertion portion 26, and the undesirable situation of the retaining piece 23 falling off the insertion portion 26 due to sudden impacts, etc., can also be reduced. On the other hand, the retaining piece 23 can be easily pulled out even when the user pinches the holding part 24 and tries to pull it out of the insertion part 26. Therefore, the operability of the user when inserting the retaining piece 23 into the insertion part 26 or pulling the retaining piece 23 out of the insertion part 26 can be greatly improved.

[0066] The insertion auxiliary portion 26d can also be in the form shown in FIG23(a). FIG23(a) shows another variation of the insertion portion 26 of the cover 1. In this example, the insertion auxiliary portion 26d of the insertion portion 26 is formed by drawing a curve in a direction away from the insertion portion forming region 26e, in other words, in a direction opposite to the insertion portion forming region 26e. The insertion auxiliary portion 26d can also be formed in this way.

[0067] Figure 23(b) shows another variation of the cover 1. In this variation, a guide display 27 is formed between the insertion portion 26 and the edge 2d of the top surface 2a. The guide display 27 is used to guide the user to insert the retaining piece 23 by informing the user of the position of the insertion portion 26. The guide display 27 can be formed arbitrarily using conventionally known methods. For example, the guide display 27 can be formed by embossing the top surface 2a to create a raised or recessed surface on the surface 2c of the top surface 2a, or by printing on the surface 2c of the top surface 2a. Alternatively, it can be formed by other methods. By forming the guide display 27, for example, when the user pinches the gripping portion 24 of the pull tab member 21 to pull up the small cover 13 to open the opening portion 12, the position of the insertion portion 26 for inserting the retaining piece 23 is indicated and guided, thereby further improving the user's operability of the pull tab member 21. In cases where the insertion part 26 is formed using a cut line, as in this example, users may sometimes be confused because they are unsure of the location of the cut line. In such cases, by forming the guide display part 27 as in this example, the location of the insertion part 26 can be indicated to the user, thus improving operability. Furthermore, in Figure 23(b), a shape with an arrow indicating the location of the insertion part 26 is used as an example of the guide display part 27, but the shape or structure of the guide display part 27 is not limited to this method as long as it can guide the user to the location of the insertion part 26; various methods can be used arbitrarily.

[0068] Next, other variations of the pull tab member 21 will be described using Figures 24 to 27. These examples show a pull tab member 21 with an identification display 28 serving as a display unit. This identification display 28 is used to easily identify the type of contents (e.g., a beverage) contained in the container 101 when the lid 1 is used to seal the container 101. The identification display 28 is formed to extend or protrude from the pull tab body of the pull tab member 21 in the width direction, in other words, in a direction intersecting the direction of movement of the pull tab member 21 when the user operates it, and more specifically, in a direction orthogonal to the direction of movement of the pull tab member 21. In the example shown in Figure 24, two identification display units 28 are formed at each end in the width direction, for a total of four, and each displays the type of contents: "Orange," "Cola," "Latte," and "Tea." Furthermore, as shown in the figure, the areas where these identification display sections 28 are formed are pre-colored. In this case, for example, when the color of the identification display section for "Orange" is orange, the color of the identification display section 28 for "Cola" is brown, the color of the identification display section 28 for "Latte" is light brown, and the color of the identification display section 28 for "Tea" is light red or green, it is easy to identify at a glance by applying a color that corresponds to the color of the contents. In this case, when the identification display section 28 is pre-colored, depending on the color applied, if the text markings on the identification display section 28 are black, they may sometimes be difficult to read. In this case, the text markings on the identification display section 28 can be replaced with white, or other more readable colors can be used. In addition, by changing the colors of the identification display sections 28 in this way, it is easy to give the pull tab member 21 a clear overall impression to the person seeing the cover 1. Therefore, in combination with the function of the pattern 24b that imitates human facial expressions, such as the pull tab member 21 in this example, it is easier to give the person holding the cover 1 a visually appealing impression.

[0069] As shown in FIG24(b), the identification display 28 is configured to be bent relative to the pull tab body. In this case, bending is easier by forming a slit or the like at the bending point as a bending aid. When the identification display 28 is bent in this way, the user can identify the contents of the container sealed by the cover 1 at a glance. For example, as shown in FIG24(b), when the "Orange" identification display 28 in the identification display 28 of the pull tab member 21 is folded, the user can identify at a glance that the container 101 contains orange juice, which can easily prevent the wrong item from being taken. In addition, since the person providing the beverage can be informed of the contents of the container 101 simply by bending the identification display 28 that matches the contents, the provider can prevent the wrong item from being taken, and it is easy to check the contents while providing the product to the customer, so the serving of beverages can be carried out smoothly.

[0070] Furthermore, in the previous description of the identification display unit 28, an example of different colors for each identification display unit 28 was used. However, all identification display units 28 can be colored with the same color, or no color can be applied to any identification display unit 28. Additionally, the types of content marked in the identification display unit 28 are not limited to those described previously; other types of content can also be used appropriately. Furthermore, the example shown in FIG. 24 uses an example of four identification display units 28, but the number of identification display units 28 is not limited to four; it can be more or less than four. Furthermore, FIG. 24(b) uses an example of only the "Orange" identification display unit 28 being bent, but it goes without saying that other identification display units 28 besides "Orange" can also be bent.

[0071] FIG. 25 shows another example of the identification display portion 28 of the pull tab member 21. The identification display portion 28 shown in FIG. 25 is formed such that the position where the bending auxiliary portion 29 is formed is located inside the pull tab body compared to the position shown in FIG. 24. When formed in this way, even when the identification display portion 28 is formed, not only can the same effect as described above be obtained, but the size of the pull tab member 21 can also be reduced. In addition, in another example of the identification display portion 28 shown in FIG. 26, the identification display portion 28 is formed by forming a cut in the pull tab body. That is, this is an example in which the outer edge of the identification display portion 28 also becomes the outer edge of the pull tab body. In this way, the identification display portion 28 can be formed without changing the size or shape of the pull tab member 21 described above.

[0072] Furthermore, in the identification display unit 28 described using Figures 24 to 26, as shown in Figure 27, the content display can also be provided on the back side of the identification display unit 28. In this way, by providing the content display on both the surface 28a side and the back 28b side of the identification display unit 28, when the identification display unit 28 corresponding to the content is bent as described above, the content can be easily identified by looking at any marking drawn on the surface 28a or the back 28b. Therefore, it is easier and simpler for the person providing the beverage or the user to identify the content. Furthermore, the marking on the back 28b side of the identification display unit 28 can be the same as or different from the marking on the surface 28a side. For example, in the case of the identification display unit 28 labeled "Orange" as described earlier, the orange color on the surface 28a and the white lettering "Orange" could be used, while the back 28b could be labeled "Orange" in black lettering against the uncolored paper background. Alternatively, the "Orange" label on the back 28b could be done using the same orange coloring as the surface 28a. In this way, the identification display unit 28 not only makes it easy to identify which surface (28a) or back 28b) is displaying the item, but also allows for simple identification of the contents. Furthermore, since the same color is used for both the surface 28a and the back 28b in the identification display unit 28, the user can easily determine which container contains which type of content at a glance. Thus, when the identification display 28 is formed on the pull tab member 21, as previously explained, the contents of the container 101 can be identified by bending the identification display 28, preventing the wrong item from being picked up and providing a sense of security when eating after knowing the contents. Furthermore, while the previous description indicated that the identification display 28 is configured to identify the contents by bending in a direction intersecting with the pull tab body, it is preferable that the angle formed between the state before and after bending is close to 180°. Moreover, in the case of such bending, it is even more preferable to configure it in a way that maintains the bent state. When formed in this way, the identification display 28 makes it easier to identify the contents of the container 101 and allows for eating with greater peace of mind.

[0073] Furthermore, the identification display section 28 of the pull tab member 21 is not limited to the structure described above. For example, as shown in FIG53, when displaying the type of contents such as "LATTE", a display section 300 for such display can be formed on the pull tab body, and a predetermined portion of the outer periphery of the display section 300 is formed as a bendable portion 301. In the case where the identification display section 28 is formed by the display section 300 and the bendable portion 301, when the contents of the container 101 are, for example, a latte, the bendable portion 301 corresponding to the portion of the display section 300 that displays "LATTE" is bent toward the pull tab body. At this time, as shown in FIG53(b), when the bendable portion 301 is bent to approximately 180°, a display window 302 is formed, so that the display section 300 can be visually identified even when the bendable portion 301 is bent. By forming the identification display unit 28 in this way, it is possible to visually confirm that what is displayed in the display window 302 is the contents of the container 101. Thus, by forming the identification display unit 28, both the user and the provider can easily confirm what the contents are, providing a sense of security. Furthermore, the method by which the identification display unit 28 identifies the contents is not limited to the methods described above. For example, the contents of the container 101 could be indicated by tearing off the previously described bend 301, etc., as long as the user and the provider can easily confirm the identification of the contents; any method other than the methods described above is acceptable.

[0074] Figures 14 to 21 show other examples of the top cover 2 and side wall 3 of the cover body according to the first embodiment. Furthermore, these are merely illustrative examples, and other structures of the top cover 2 and side wall 3 may also be used. Additionally, for ease of explanation, the pull tab member 21 is omitted from Figures 14 to 17.

[0075] The cover 1 shown in FIG14 is in a form where the raised portion 4 of the top cover 2 and the upper end of the side wall 3 form a single surface. In this case, as shown in FIG14(a), not only can the raised portion 4 and the upper end of the side wall 3 form a single surface, but as shown in FIG14(b), the raised portion 4 can also be folded inward so that the height position of the curved portion of the raised portion 4 at the upper end and the position of the upper end of the side wall 3 form a single surface. In addition, as shown in FIG14(c), it can also be formed such that the height position of the curved portion of the raised portion 4 and the position of the upper end of the side wall 3 form a single surface, while at the same time the folded portion of the raised portion 4 does not reach the top cover 2. Further, as shown in FIG14(d) and (e), the upper end position of the folded portion obtained by folding the side wall 3 outward can also be made to coincide with the upper end position of the raised portion 4, forming a single surface.

[0076] Figure 15 shows an example where a curled portion 41, as a protrusion, is formed at the upper end of the cover 1. The shape of the curled portion 41 can be either curled as shown in Figure 15, or it can be a shape formed by crushing a curled shape into a flange shape. Here, the protrusion includes the concept of a shape that extends outward compared to the side wall 3. In Figure 15(a), there is an example where the upright portion 4 is formed on the same surface as the side wall 3 and the curled portion 41 is formed on the side wall 3. In addition, Figure 15(b) shows an example where the curled portion 41 is formed on the side wall 3 in the same way as in Figure 15(a), but the upright portion 4 is formed lower than the side wall 3. Figure 15(c) shows an example where the curled portion 41 is formed on the side wall 3 and the upright portion 4 protrudes higher than the upper end of the side wall 3. Furthermore, Figure 15(d) shows an example where the upper part of the upright portion 4 is located above the upper end of the side wall 3 and extends outward compared to the side wall 3 to form a curled portion 41. This also forms a curled portion 41.

[0077] Furthermore, if the curled portion 41 is formed, not only can the strength of the side wall 3 and the top cover 2 be increased, but the heat insulation effect can also be improved. For example, when drinking hot beverages, the curled portion 41 makes it difficult for the lips to feel uncomfortable heat or improves the feel of the mouth.

[0078] Figure 16 shows a configuration where the upright portion 4 protrudes upwards compared to the side wall 3. For example, in Figure 16(a), the upright portion 4 protrudes upwards compared to the side wall 3; in Figures 16(b) and 16(c), the upright portion 4 is formed by folding inwards, with the folded end protruding upwards compared to the upper end of the side wall 3; in Figures 16(d) and 16(e), the side wall 3 is formed by folding outwards, with the upper end of the upright portion 4 protruding upwards compared to the folded end.

[0079] Figure 17 shows a configuration where, unlike Figure 16, the upper end of the upright portion 4 is positioned lower than the upper end of the side wall 3. In Figure 17(a), the upper end of the side wall 3 is positioned higher than the upper end of the upright portion 4. In Figures 17(b) and 17(c), the upright portion 4 is folded inwards, and the upper end of the side wall 3 is positioned above the upper end of the folded portion. Furthermore, in Figures 17(d) and 17(e), the side wall 3 is folded outwards, and the height of the folded portion is positioned above the upper end of the upright portion 4.

[0080] Figures 18(a) and 18(b) show an example where an inclined portion 51 is formed in the top cover portion 2. In this way, if an inclined portion 51 is formed in the top cover portion 2, when returning from an inclined state of the container 101 or the lid 1 mounted on the container 101 to a horizontal state after drinking a beverage, any beverage residue remaining on the inner surface of the upright portion 4 can easily be transferred back to the opening portion 12 along the inclined portion 51. By forming the inclined portion 51 in this way, beverage residue is less likely to remain on the surface 2b of the top cover portion 2. Furthermore, when the inclined portion 51 is formed in the top cover portion 2 in this way, the position of the opening portion 12 can be either formed in a position avoiding the inclined portion 51 as shown in Figure 18(a), or formed in a manner where the opening portion 12 is formed in a part of the inclined portion 51 as shown in Figure 18(b). Additionally, the shape of the side wall 3 can be either formed in a straight line as shown in Figure 18(a), or formed in a manner that makes the lower wall 6 bulge out as shown in Figure 18(b). Figure 18(c) shows the previously described cover 1, and an example in which a guide portion 52 is formed at the lower end of the lower wall 6. This guide portion 52 facilitates the installation of the cover 1 onto the container 101 during installation. By forming this guide portion 52, installation relative to the container 101 can be performed more smoothly.

[0081] Figure 19 shows the previously described cover 1, and is another example of the form of the engaging portion 7 formed on the lower wall 6. Figure 19(a) shows the form of the previously described cover 1, in which the engaging portion 7 is formed in a straight line that tapers to a tapered shape at the front end, rather than bulging outwards. In addition, the structures shown in Figures 19(b) to (e) are in which the shape of the engaging portion 7 is the same as that described in Figure 19(a), formed in a straight line that tapers to a tapered shape at the front end, and on this basis, instead of forming a raised portion 4, it has a downward-facing raised portion 61 formed by raising the periphery of the top cover portion 2 downwards. Cover 1 can also be of this form.

[0082] Figure 20 shows an example of a cover 1 formed in such a way that a downwardly raised portion 61 is formed by the periphery of the top surface 2a of the top cover portion 2 facing downwards, and a sidewall 3 is formed around the periphery of the downwardly raised portion 61, and the downwardly raised portion 61 is joined to the sidewall 3. The cover 1 in Figure 20(a) has a straight, tapered front end forming the engaging portion 7, and the cover 1 in Figure 20(b) has an engaging portion 7 that bulges outwards. The structure of the engaging portion 7 is not limited to this form, and the structure described above may also be used appropriately. Furthermore, the cover 1 in the form shown in Figure 20(a) is shown in Figure 21.

[0083] (Second Embodiment) Next, the cover 1 of the second embodiment will be described. The cover 1 of the second embodiment is used by joining the edge 103 of the opening 102 of the container 101. The cover 1 is formed to cover the opening 102 when joined with the opening 102 of the container 101. As shown in Figures 28(a), 28(b), 29, 30(a), and 30(b), the cover 1 has a joining area R that joins with the edge 103 of the opening 102 of the container 101 and a portion corresponding to the joining area R (hereinafter referred to as the "joining area corresponding portion Rd"). In addition, when the cover 1 is viewed from above (with the vertical direction as the line of sight), a small cover piece 13 is provided in the area corresponding to the inner side of the joining area R in the exposed surface 70 of the cover 1 (hereinafter sometimes simply referred to as the area inside the joining area R, or the inner area Rn). Other structures may also be formed in the same way as in the first embodiment. Therefore, in the cover 1, an opening 12 is formed when the small cover 13 is pulled up. Additionally, in the cover 1, the pull tab member 21 engages with the small cover 13. The small cover 13, opening 12, and pull tab member 21 of the cover 1 in the second embodiment are formed identically to those provided in the top cover 2 in the first embodiment. In the cover 1, the opening forming portion 11 is also formed by the small cover 13 and the opening 12. Figures 28(a), 28(b), and 29 are diagrams showing one embodiment of the cover 1 of the second embodiment.

[0084] (Joining Area) The joining area R is an annular area formed along the opening 102 of the container 101 in a shape corresponding to the opening 102. The width W (width along the inward and outward directions) of the joining area R is generally the same as or narrower than the width of the edge 103 of the opening 102. However, this does not preclude the width W of the joining area R from being wider than the width of the edge 103 of the opening 102. In addition, the joining area R may be formed on the inner side relative to the outer peripheral end 71 of the cover 1, or it may be formed up to the outer peripheral end 71 of the cover 1 as shown in FIG. 39. FIG. 39 is a top view showing one of the other embodiments of the cover 1 of the second embodiment. Unless otherwise specified, the position relative to the joining area R is defined as the position relative to the portion of the cover 1 in which the joining area R is formed, for example, in the case of the inner (outer) side of the joining area R, unless otherwise specified, it means that it is located on the inner (outer) side relative to the portion of the cover 1 in which the joining area R is formed.

[0085] (Small cover piece) A small cover piece 13 is provided on the cover body 1. In the cover body 1 of the second embodiment, the small cover piece 13 is connected to the peripheral portion 72 including the engagement area R. When viewed from above, the peripheral portion 72 is composed of the portion of the exposed surface 70 of the cover body 1 other than the small cover piece 13. As shown in Figures 30(a) and 30(b), in the cover body 1, as in the case shown in the first embodiment, the small cover piece 13 is lifted in a state linked to the movement of the pull tab member 21 that engages with the small cover piece 13 at the engagement portion 22. The small cover piece 13 uses the connecting portion between the peripheral portion 72 and the small cover piece 13 as a hinge portion 14, and the opening portion 12 is exposed when the small cover piece 13 is lifted with the connecting portion as a support axis. When viewed from above, the small cover piece 13 is located inside the engagement area R. Figures 30(a) and 30(b) are used to illustrate the state in which the opening 12 is exposed in the cover 1 of the second embodiment by setting the small cover 13 to be lifted. Hereinafter, the connecting part (hinge part 14) in the outer periphery 73 of the small cover 13, which becomes the support shaft when the small cover 13 is lifted, is referred to as the hinge connecting part 74.

[0086] The shape and structure of the small cover 13 are not particularly limited. As shown in Figures 28(a) and 28(b), the shape and structure of the small cover 13 can also be the same as the various shapes and structures shown in one example of the first embodiment. In addition, as shown in Figure 29, the shape of the small cover 13 is preferably a contour shape having at least a portion of the outer periphery 73 of the small cover 13 extending along the inner end of the engagement region R. In the example of Figure 29, the shape of the front edge 75 in the outer periphery 73 of the small cover 13 is the shape along the inner end of the engagement region R. In addition, at this time, the shape of the front edge 75 can easily become the shape along the inner end of the edge 103 of the opening 102. This shape of the small cover 13 can also be applied to the small cover 13 of the cover body 1 of the first embodiment. Hereinafter, in the description of the cover body 1 of the second embodiment, unless otherwise stated, the case of using the small cover 13 shown in Figure 29 will continue to be described. Furthermore, in the example of the small cover plate 13 shown in FIG29, the outer periphery 73 is composed of a front edge portion 75, a hinge connection portion 74, and a side edge portion 76 connecting the front edge portion 75 and the hinge connection portion 74.

[0087] In the example shown in FIG30, when viewed from above, the front edge 75 of the outer periphery 73 of the small cover 13 is preferably formed between position PM1 and position PM2 as shown in FIG32. FIG32 is a diagram illustrating the position of the front edge 75. Position PM1 is the intersection of the extended surface M1 of the inner peripheral surface of the side wall 104 of the container 101 and the exposed surface 70 of the cover 1 when the cover 1 is joined to the container 101. Position PM2 is the intersection of the surface M2 extending along the thickness direction of the cover 1 from the inner end of the joining area R and the exposed surface 70 of the cover 1. However, this does not prevent the front edge 75 of the small cover 13 from disengaging between position PM1 and position PM2. For example, it is not prohibited for the front edge 75 to be formed at a position slightly closer to the center side of the cover 1 than at position PM2.

[0088] The outer periphery 73 of the small cover 13, excluding the hinge connection 74, can have either a cut-off portion relative to the peripheral portion 72 or a vulnerable portion in a partially joined state. As shown in the example of FIG29, the cut-off portion can be formed by providing a cut line 16 along the boundary between the small cover 13 and the peripheral portion 72. As shown in the example of FIG28, the vulnerable portion can be formed by providing a structure (perforated structure) at the boundary between the small cover 13 and the peripheral portion 72, in which shorter cut lines 16 and point-like joints 17 are alternately arranged, or by forming a half-cut structure. The half-cut structure can, for example, be represented by FIG40(a) and FIG40(b) as described later, as a structure that cuts into the cover 1 to a predetermined depth in the thickness direction.

[0089] In the cover 1 of the second embodiment, even after the opening 12 is exposed by raising the small cover 13, it can be configured to cover the opening 12 with the small cover 13. When the small cover 13 is raised, the opening 12 is exposed. This state is called the open state. The state in which the opening 12 is covered by the small cover 13 is called the closed state.

[0090] In the cover 1, as shown in FIG35, when in the sealed state, the end face of the peripheral portion 72 can face the end face 73a (outer peripheral end face) of the outer periphery 73 of the small cover 13. At this time, the portion of the end face of the peripheral portion 72 that faces the end face 73a of the outer periphery 73 of the small cover 13 becomes the opposing surface 77. In the cover 1 of the second embodiment, it is preferable that the end face 73a of the outer periphery 73 contacts the opposing surface 77 to form a contact portion 78. When the cover 1 is formed of paper material, such a cover 1 can be formed, for example, by forming a cut line 16 at the boundary between the small cover 13 and the peripheral portion 72. When the cut line 16 is formed, the paper material forming the cover 1 is compressed and cut at the boundary between the small cover 13 and the peripheral portion 72. In addition, at this time, the paper material is prone to be stretched near the boundary between the small cover 13 and the peripheral portion 72. Therefore, in the state where the end face 73a of the outer periphery 73 of the small cover 13 is arranged face-to-face with the opposing surface 77 (i.e., in the sealed state), the end face 73a and the opposing surface 77 contact each other on the cut line 16 to form a contact portion 78, and a force F is easily generated at the contact portion 78 that pushes the small cover 13 and the peripheral portion 72 against each other. Moreover, when the small cover 13 is opened from this sealed state, at least a portion of the end face 73a of the outer periphery 73 rubs against the opposing surface 77. Therefore, in the cover body 1, when in the sealed state, it is possible to form a state in which the small cover 13 firmly covers the opening 12, and the concern of liquid leaking from the inside of the container 101 through the space between the small cover 13 and the peripheral portion 72 can be reduced. However, in the cover body 1, since the small cover 13 and the peripheral portion 72 are separated by the cut line 16, air permeability can be ensured, and steam can pass through the space between the small cover 13 and the peripheral portion 72.

[0091] Furthermore, when the cover 1 is made of paper material, as shown in the example of FIG35, it is preferable to form a compression portion 79 constituting the cover 1 as a paper material at the position of the end face 73a of the small cover piece 13 and near the opposing surface 77. In the example of FIG35, the compression portion 79 near the end face 73a of the small cover piece 13 is configured such that the compression ratio gradually increases and the thickness gradually decreases towards the end face 73a. In addition, the compression portion 79 near the opposing surface 77 is configured such that the compression ratio gradually increases and the thickness gradually decreases towards the opposing surface 77. In this case, even when the end face 73a and the opposing surface 77 are in contact with a certain degree of force, it is difficult for deformation or bending to occur at the contact portion 78, and the structure of the contact portion 78 can be firmly maintained.

[0092] Furthermore, in the cover 1, when in the sealed state, from the viewpoint of forming a state in which the small cover 13 firmly covers the opening 12, the small cover 13 and the peripheral portion 72 can also be formed as shown in FIG. 36. In FIG. 36, the shape of the outer periphery 73 of the small cover 13 is set to have a partially formed wavy structure, and the shape of the periphery of the opening 12 (the part of the peripheral portion 72 that forms the opposing surface 77) is set to be consistent with the shape of the outer periphery 73 of the small cover 13. When the small cover 13 and the peripheral portion 72 are formed in this shape, at least a portion of the contact portion 78 has a wavy structure, that is, the area of ​​the contact portion 78 becomes larger, making it easier to maintain the state in which the small cover 13 firmly covers the opening 12.

[0093] (Pull tab member) As shown in Figures 28, 29 and 30, the pull tab member 21 may also be constructed in the same way as the pull tab member provided on the cover 1 of the first embodiment. Regarding the pull tab member 21, one end 21a of the pull tab member 21 is engaged with the portion of the small cover 13 near the front end (the position near one end 13a).

[0094] In the examples of Figures 30(a) and 30(b), the pull tab member 21 has a retaining piece 23 formed between the joint portion 22 and the pinch portion 24, and is configured such that when the small cover 13 is opened by pinching the pinch portion 24, the retaining piece 23 protrudes from the pull tab member 21. Furthermore, an insertion portion 26 is formed in the peripheral portion 72 for inserting the protruding retaining piece 23. Further, it is configured such that the retaining piece 23 can be inserted into the insertion portion 26 to maintain the small cover in an open state. In addition, the insertion portion 26 may also have a main portion 26a and an auxiliary portion 26b, similar to the first embodiment.

[0095] Furthermore, in the examples of Figures 28 and 29, in the closed state, at least a portion of the pull tab member 21 overlaps directly above the small cover plate 13. In this configuration, even in the closed state, by keeping the position of the pull tab member 21 horizontal in a manner that makes it substantially parallel to the cover 1, and simultaneously moving the pull tab member 21 to release the small cover plate 13 from standing up, it is easy to keep the movement of the small cover plate 13 still while the contact portion 78 between the end face 73a and the opposing surface 77 of the small cover plate 13 is formed.

[0096] Furthermore, in the example of FIG. 28, the pull tab member 21 is arranged such that the pinching portion 24 is located on the center side of the cover 1 compared to the connecting portion 22, but the arrangement of the pull tab member 21 is not limited to this. It is also possible to arrange the pull tab member 21 such that the distance from the center of the cover 1 to the connecting portion 22 is the same as the distance from the center of the cover 1 to the pinching portion 24, as shown in FIG. 47. The pull tab member 21 can also be arranged such that the connecting portion 22 is located on the center side of the cover 1 compared to the pinching portion 24. When viewed from above the cover 1, from the viewpoint that the pull tab member 21 is housed within the exposed surface 70 of the cover 1, as shown in the example of FIG. 28, the pull tab member 21 is preferably arranged such that the pinching portion 24 is located on the center side of the cover 1 compared to the connecting portion 22.

[0097] According to the second embodiment, the same as the cover 1 of the first embodiment, a cover can be obtained in a state in which the opening corresponding to the drinking spout can be set to open simply and hygienically.

[0098] A modified example of the cover 1 of the second embodiment will be described.

[0099] (Modification 1) In the cover 1 of the second embodiment, as shown in Figures 33(a) and 33(b), when viewed from above, a groove 80 may be formed on the exposed surface 70 and in the region corresponding to the inner side of the engagement region R (referred to as the inner side of the engagement region R) (Modification 1). Figures 33(a) and 33(b) are diagrams showing an embodiment of the cover 1 of Modification 1 of the second embodiment.

[0100] (Groove) In Modification 1, the groove 80 is preferably formed such that it extends along the inner edge RA of the joint region R on the inner side of the joint region R. The depth of the groove 80 is not particularly limited, but it is preferably configured to gradually deepen as it moves closer to the small cover plate 13 from a position farther away from the small cover plate 13. In addition, as shown in the example of FIG33(a), the groove 80 is preferably also formed on the small cover plate 13.

[0101] In the example of FIG33(a), the groove 80 is formed in a C-shape along the inner edge RA of the engagement region R, but it can also be formed in a ring shape.

[0102] Even when the groove 80 is formed, the portion of the outer periphery 73 of the small cover piece 13 other than the hinge connection portion 74 (front edge portion 75, side edge portion 76) may have a cut line 16 as shown in FIG. 33(b), and may also be a half-cut portion 81 as an example of a vulnerable portion as shown in FIG. 40(a) and FIG. 40(b). FIG. 40(a) and FIG. 40(b) are diagrams showing one embodiment of the cover 1 with the groove 80 formed. FIG. 40(b) is a partial enlarged view of the dashed area X in FIG. 40(a). The half-cut portion 81 shown in this example is formed by cutting the component forming the cover 1 into the exposed surface 70 side of the cover 1 to a predetermined depth. That is, the half-cut portion 81 is a portion in which the component forming the cover 1 is cut into to a degree that does not penetrate, and is a portion having the above-mentioned half-cut structure. However, this does not limit the structure of the half-cut portion 81. Furthermore, in the cases shown in Figures 40(a) and 40(b), where the portion of the outer periphery 73 of the small cover 13 other than the hinge connection portion 74 is a half-cut portion 81 that is a weak portion, even if the groove 80 is in a state of increased depth and is formed across the boundary between the small cover 13 and the peripheral portion 72, it is difficult to generate a gap at the intersection of the boundary between the small cover 13 and the peripheral portion 72 and the groove 80.

[0103] The number of grooves 80 formed is one in the example of FIG33(a), but multiple grooves 80 may also be formed concentrically. When multiple grooves 80 are formed, a cover 1 can be used to cover the openings 102 of multiple containers 101 with different diameters of openings 102.

[0104] According to the second embodiment of the modified example 1, when the cover 1 is attached to the opening 102 of the container 101 containing liquid, even if liquid leaks from inside the container 101 onto the exposed surface 70 of the cover 1, the liquid can flow downward into the groove 80 before overflowing to the outside of the cover 1. Furthermore, when the groove 80 is formed to deepen towards the small cover 13, the liquid flowing into the groove 80 can flow downward towards the position of the small cover 13. Moreover, by pulling up the small cover 13 to expose the opening 12, liquid can drip from the opening 12 into the container.

[0105] (Protrusion) In the cover 1, preferably, the protrusion 82 is located at a position corresponding to the formation position of the groove 80 and on the opposite side of the formation surface (exposed surface 70) of the groove 80. In this case, as shown in FIG43, the protrusion 82 is preferably formed at a position that contacts the inner surface side of the edge 103 of the opening 102 of the container 101. In addition, the height of the protrusion 82 is preferably such that it is difficult for the edge 103 of the opening 102 of the container 101 to deviate in the surface direction of the exposed surface 70 of the cover 1. This protrusion 82 can be achieved by embossing the cover 1. By embossing, a groove 80 is formed on the exposed surface 70 side of the cover 1, and a protrusion 82 with a height corresponding to the depth of the groove 80 is formed at a position on the opposite side of the formation position of the groove 80. Furthermore, by forming the groove 80 along the inner side of the edge 103 of the opening 102 of the container 101, as shown in FIG43, the protrusion 82 can be formed along the inner end of the edge 103 of the opening 102 of the container 101 and in contact with the inner surface of the edge 103 of the opening 102 of the container 101. FIG43 is also a cross-sectional view showing an example of the lid 1 being disposed on the container 101.

[0106] By forming such a protrusion 82, when the cover 1 is arranged to cover the opening 102 of the container 101, it is easy to position the cover 1 relative to the container 101.

[0107] (Modification 2) In the cover 1 of the second embodiment, as shown in FIG31, a gripper 83 (pull tab) and a label 84 (Modification 1) may also be formed from the outer periphery 73 of the cover 1 outward. The gripper 83 is preferably formed at a position far from the opening start end (one end 13a) of the small cover 13. The shape and size of the gripper 83 are suitable for being formed so that it can be pinched by the user's fingertips. By forming the gripper 83 in this way, the concern that the hand will come into contact with the opening 12 when the cover 1 is grasped can be reduced, and the contamination of the opening 12 caused by the hand coming into contact with the opening 12 can be suppressed. Furthermore, in the example of FIG31, when the cover 1 is viewed from above, the gripper 83 is formed in the peripheral portion 72, and the portion formed in the outer periphery 73 includes the portion farthest from the one end 13a. On the gripper 83, any display content 200, such as text indicating the size of the lid 1 or container 101 (e.g., "L" as shown in FIG. 48), can be applied. The display content applied to the gripper 83 is not limited to printing; it can also be text that is visually recognizable by embossing or by cutting a shape corresponding to the text (e.g., "L") onto the gripper 83. Furthermore, the gripper 83 can be embossed or cut in place of the aforementioned display, or partially or entirely, based on the existing display. By performing this processing on the gripper 83, the user can easily pick up the lid 1 when holding it by the gripper 83. In addition, the above example illustrates the display of the size of the lid 1 or container 101 using text, but the method of displaying the size of the lid 1 or container 101 is not limited to the above example. For example, the shape or color of the gripper 83 can be changed according to the size of the lid 1 or container 101, and the size of the lid 1 or container 101 can be identified by visually recognizing its shape or color. For example, when identification is performed by changing the shape of the gripper 83, in addition to the shape of the gripper 83 described above, the shape of the gripper 83 can be changed as shown in FIG. 49(a) or FIG. 49(b), and other shapes can also be used for identification. In addition, the size of the lid 1 or container 101 can be identified by methods other than these. Furthermore, the above relates to examples of identifying the size of the lid 1 or container 101, but the object of identification is not limited to this size of the lid 1 or container 101, and other objects can also be listed as objects of identification.

[0108] The label 84 is not limited in shape or size, but it is suitable for the user to recognize. In the example of FIG31, a plurality of labels 84 are formed on the outer periphery 73 of the lid 1 and near the gripper 83. For example, the label 84 can also be used in the following manner: Each of the plurality of labels 84 is written with a separate product name, and the label 84 with the product name corresponding to the contents of the container 101 is bent. Thus, even after the container 101 is attached to the lid 1, the contents of the product contained inside the container 101 can be identified by recognizing the bent label 84.

[0109] Furthermore, in the examples of Figures 54 and 55, a plurality of labels 84 are formed on the outer periphery 73 of the cover 1. These labels 84 are configured to be bent along the outer periphery 73 of the cover 1. Preferably, a bending portion 400 is formed at the boundary between the outer periphery 73 and the labels 84 to facilitate bending of the labels 84. This bending portion 400 can be of any structure as long as it facilitates bending of the labels 84; for example, it can be formed with a perforation line, a cut smaller than the thickness of the material constituting the cover 1, a fold line, or a combination of these forms at the boundary between the outer periphery 73 and the labels 84. Additionally, any structure other than those described above is acceptable as long as it facilitates bending of the labels 84. On the cover 1, individual product names such as "COLA," "LATTE," "TEA," and "OTHER" can be written at the location corresponding to the location where the labels 84 are formed. These individual product names are not limited to those described above and can be other designations. Furthermore, it is preferable that at least a portion of these individual product names are displayed on the inside relative to the outer perimeter 73, and even more preferably that all individual product names are displayed on the inside relative to the outer perimeter 73. By displaying them in this way, the product names can be more clearly visually identified. Figure 55(a) shows a top view illustrating an example of the use of the lid 1 in this case. This example is an example of use when the contents are cola. In this case, the label 84 corresponding to the part displaying "COLA" corresponding to cola is bent. The state of the label 84 after bending is shown in Figure 55(b). The bending direction of the label 84 is not limited to upward as shown in Figure 55(b), but can also be downward. In this way, when the label 84 corresponding to the contents is bent, since other labels 84 are not bent, it is possible to clearly visually identify the label corresponding to the bent part of the label 84 as the contents. Store clerks or buyers can easily know what the contents are, and can consume with peace of mind. Furthermore, while this example illustrates the use of a bent label 84, the label 84 can also be removed by tearing it off. In this case, to make the label 84 easier to tear off, it is preferable to form the perforation line or the like at the location corresponding to the bent portion 400. Even if the label 84 is torn off like this, the contents can be easily identified. Moreover, even if the label 84 is not bent or torn off, any other structure is acceptable as long as the contents can be clearly identified. Additionally, the label 84 can be colored with a predetermined color, and conventionally known methods such as embossing can be arbitrarily selected and appropriately applied.

[0110] Furthermore, in the example of FIG. 31, the label 84 is formed on the periphery 72 of the cover 1, but it can also be formed on the pull tab member 21. For example, as shown in FIG. 45(a), a plurality of labels 84 can be formed around the pull tab member 21. In addition, when a gripper 83 is formed, as shown in FIG. 45(b), it can be formed on the gripper 83 together with or in place of the insertion portion 26. The insertion portion 90 can also be formed with the same structure as the insertion portion 26. In FIG. 45(b), the insertion portion 90 is formed in place of the insertion portion 26. The insertion portion 90 has the same function as the insertion portion 26. However, in this case, the size of the pull tab member 21 or the small cover 13 (opening 12) is suitable for being set such that the retaining piece 23 of the pull tab member 21 is inserted into the insertion portion 90 when the small cover 13 is lifted. Alternatively, the pull tab member 21 can be locked by hanging the retaining piece 23 on the outer periphery 73 of the cover 1. In this case, the insertion part 26 can also be omitted for the cover 1.

[0111] As shown in FIG45(b), when the insertion portion 90 is formed on the gripper 83, especially when the outline of the small cover 13 is formed by a semi-tangent, the portion connecting the surface of the top surface 2 and the back surface no longer exists in the area surrounded by the engagement area R. Therefore, after the cover 1 is sealed in the container 101 and before the user opens the small cover 13, the container 101 can be completely sealed, preventing foreign objects from entering from the outside or the contents from leaking out of the container 101 when the user carries the container 101 and the container 101 shakes. In addition, when the insertion portion 90 is formed on the gripper 83 in this way, the size of the small cover 13 and even the size of the opening 12 can be increased. In this way, if the opening 12 and the small cover 13 can be increased, it will be easier for the user to drink the contents, and the ease of filling the container 101 with beverages or the like from the opening 12 can be greatly improved.

[0112] Furthermore, Figure 45(b) illustrates a configuration where an insertion portion 90 is formed on the gripper 83 and a retaining piece 23 is inserted to lock the pull tab member 21. However, as shown in Figure 50(a), the retaining piece 23 can also be hooked onto the outer periphery 73 of the cover 1 to lock the pull tab member 21. Additionally, as shown in Figure 50(b), when the small cover 13 is closed again, it can be configured such that the retaining piece 23 can be hooked onto the outer periphery 73 on the side closest to the small cover 13 to maintain the small cover 13 in a closed state. Furthermore, when the small cover 13 is opened again after being closed, the hook between the outer periphery 73 and the small cover 13 can be released. Additionally, as shown in Figure 56, a retaining support portion 401 extending from the outer periphery 73 can be formed instead of an insertion portion. In the case where a retaining support portion 401 is formed as described above, a retaining portion 23 or the like is hooked onto the retaining support portion 401 to keep the small cover 13 in the open state. When the small cover 13 is closed again, the retaining portion 23 is detached from the retaining support portion 401, thereby closing the small cover 13 again. Furthermore, in this case, the shape and size of the retaining support portion 401 are not limited as long as it can hold the retaining portion 23; it can be chosen arbitrarily. In this example, by hooking the retaining piece 23 formed on the pull tab member 21 onto the outer periphery 73, the open state and the closed state of the small cover 13 can be maintained. However, the structure used to maintain the open and closed states of the small cover 13 is not limited to the above-described case; other structures can be chosen and used arbitrarily. For example, a sealing member can be used instead of the pull tab member 21, thereby maintaining the open or closed state of the small cover 13 through adhesive action. Other members can also be used to maintain the aforementioned states of the small cover 13.

[0113] (Modification 3) In the cover 1 of the second embodiment, as shown in Figures 34(a) and 34(b), the small cover 13 can also be formed in a large size such that the pull tab member 21 overlaps the small cover 13 entirely in the closed state (Modification 3). However, in Modification 3 of the second embodiment, the small cover 13 is formed inside the joint area R and is smaller than the size of the cover 1. Figures 34(a) and 34(b) are diagrams showing an embodiment of the cover 1 of Modification 3 of the second embodiment.

[0114] In the cover 1 of the second embodiment, the hinge connection portion in the outer periphery of the small cover piece can be cut off when the cover is open. In this case, as shown in FIG34(a), the hinge connection portion 74 in the outer periphery 73 of the small cover piece 13 preferably has the same structure as the vulnerable portion. In FIG34(a), the vulnerable portion becomes a repeating structure (perforated structure) of the cut line 16 and the dotted joint portion 17. Furthermore, in the example of FIG34(a), the portion in the outer periphery 73 of the small cover piece 13 other than the hinge connection portion 74 becomes the cut line 16.

[0115] In addition, in the cover 1 of the second embodiment, the hinge connection 74 may be omitted as shown in FIG34(b). In the example of FIG34(b), the outer periphery 73 of the small cover 13 becomes the vulnerable part. The vulnerable part is the same as that in FIG34(a), which is a repeating structure (perforated structure) of the cut line 16 and the dotted joint 17.

[0116] In this variation 3 of the second embodiment, when the small cover 13 is lifted by the pull tab member 21 in the sealed state, the small cover 13 separates from the peripheral portion 72. Furthermore, in this variation 3 of the second embodiment, as shown in FIG. 34, the retaining tab 23 and the insertion portion 26 may be omitted. However, in the present invention, from the viewpoint of obtaining the effect of holding the small cover 13 on the peripheral portion 72, it is preferable to have the retaining tab 23 and the insertion portion 26.

[0117] (Modification 4) In the cover 1 of the second embodiment, instead of forming a groove 80 on the inner side of the joint area R, as shown in Figures 37(a) and 37(b), a recessed portion 85 (Modification 4) can be formed to make the entire inner side of the joint area R recessed relative to the portion corresponding to the joint area R. Figures 37(a) and 37(b) are diagrams showing an embodiment of the cover 1 of Modification 4 of the second embodiment.

[0118] In the lid 1, it is preferable that the position opposite to the forming surface (exposed surface 70) of the recess 85 is a raised portion 86. In this case, the outer peripheral end 86a of the raised portion 86 is preferably formed to contact the inner surface side of the edge 103 of the opening 102 of the container 101. In addition, the height of the raised portion 86 is preferably a height that ensures that it is difficult to deviate relative to the opening 102 of the container 101. This raised portion 86 can be achieved by performing an embossing process on the lid 1. The recess 85 is formed on the exposed surface 70 side of the lid 1 by embossing, and the raised portion 86 with a height corresponding to the depth of the recess 85 is formed on the opposite side corresponding to the forming position of the recess 85. Furthermore, by forming the recess 85 such that its outline shape follows the shape of the opening 102 of the container 101, as shown in FIG44, the protrusion 86 can be formed to contact the inner surface side of the edge 103 of the opening 102 of the container 101. FIG44 is also a cross-sectional view showing an example of the lid 1 disposed on the container 101.

[0119] By forming such a raised portion 86, when the cover 1 is arranged to cover the opening 102 of the container 101, it is easy to position the cover relative to the container 101.

[0120] (Modification 5) In the cover 1 of the second embodiment, as shown in Figures 41(a) and 41(b), an upper bulge 87 may be formed on the inner side of the joint area R (Modification 5). Figures 41(a) and 41(b) are diagrams showing an embodiment of the cover 1 of Modification 5. The upper bulge 87 is preferably formed in a region that avoids the small cover plate 13. In this case, even if the container 101 contains liquid and the liquid leaks onto the exposed surface 70 of the cover 1, it is easy to flow towards the small cover plate 13 side that is formed downstream of the upper bulge 87, thereby making it easy for the leaked liquid to return to the container 101 by opening the small cover plate 13 to expose the opening 12. Alternatively, a slit 88 penetrating the cover 1 may be formed on the upper bulge 87. The slit 88 is formed to a size that allows a stick-shaped object such as a straw to be inserted from the outside. By forming a slit 88, liquid in the container can be sucked out using a straw or the like. In the example of FIG41(a), the slit 88 is formed as a structural part with a cross-shaped cut on the component constituting the cover 1, but the structure of the slit 88 is not limited to this.

[0121] (Modification 6) In the example of FIG44, the recessed portion causes the entire inner region of the joining region R to be recessed. However, in the cover 1 of the second embodiment, as shown in FIG46(a) and FIG46(b), a partial recessed portion 89 (Modification 6) can also be formed to partially recess the inner region of the joining region R. FIG46(a) is a top view for illustrating an embodiment of the cover 1 of Modification 6 of the second embodiment. FIG46(b) is a cross-sectional view schematically showing the state of the cross-section of the GG line segment in FIG46(a). The partial recessed portion 89 is formed on the outside of the opening 12 and on the inner region Rn. In this example, the partial recessed portion 89 has a shape that is recessed in such a way that it forms an inclined surface that slopes downward toward the opening 12. In addition, in this example, a partial protrusion 91 is formed on the side opposite to the exposed surface of the cover 1 in a shape corresponding to the portion on which the partial recessed portion 89 is formed. By forming the partial protrusion 91, it is easy to position the cover 1 to the opening 102 of the container 101. As shown in FIG46, when the partial recess 89 is formed on the outside of the opening 12 in a manner that avoids the position of the opening 12, when the stamping process for forming the partial recess 89 is performed, it is difficult to apply pressure to the part 160 near the opening 12, so there is a risk that the point joint 17 around the opening forming part 11 will be cut off and the opening 12 will open.

[0122] (Modification 7) As shown in FIG51, the cover 1 may also have a window 201 formed on the inner side of the joint area R. By forming the window 201, when the cover 1 is joined and sealed to the container 101, the contents of the container 101 can be visually identified, and the contents can be easily confirmed to provide a sense of security. In addition, the membrane material used for the window 201 can include membrane materials using synthetic resins or biodegradable resins as raw materials. Examples of synthetic / natural resins include olefin resins such as polyethylene (PE) or polypropylene (PP), styrene resins such as polystyrene (PS), acrylic resins such as polyacrylate or polymethacrylate, vinyl resins such as polyvinyl chloride (PVC) or polyvinyl acetate, polyamide resins, polyimide resins, polyester resins such as polyethylene terephthalate (PET), fluorinated resins, polycarbonate resins (PC), and polyether resins such as polyetheretherketone (PEEK) or polyether ether (PES). Examples of biodegradable resins include: microbially produced biodegradable resins such as polyhydroxyalkanoates (PHA) or PHA-like copolymers; natural product biodegradable resins such as cellulose acetate derivatives or starch-based resins made primarily from corn starch; lactic acid resins such as polylactic acid (PLA), polylactic acid / polycaprolactone copolymers, and polylactic acid / polyether copolymers; succinic acid resins such as polybutylene succinate (PBS), polybutylene adipate succinate (PBSA), and polyethylene terephthalate (PETS); and chemically synthesized biodegradable resins such as polycaprolactone and polyvinyl alcohol (PVA). Other examples include polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product names: Biorecover, Cra Drop, etc.). Among these, biodegradable resins with fewer environmental pollution problems are preferred. In addition, when the product contained in the container is a liquid, it is better to choose a material with excellent water resistance and oil resistance.

[0123] (Modification 8) As shown in FIG52, the inner side of the joint area R of the lid 1 may also be raised. By forming such a raised portion 202, the space for holding the contents in the container 101 can be increased. For example, when the contents are liquids such as coffee, even if a substance such as cream is placed on the liquid, the contact with the back of the lid 1 can be greatly reduced. In addition, the height of the raised portion 202 can be arbitrarily determined.

[0124] Furthermore, the various forms of the second embodiment of the cover of the present invention can also be applied to the forms of the first embodiment. For example, the structures of the window portion and the raised portion described in the variations 7 and 8 of the second embodiment can be applied to the cover of the first embodiment. In addition, structures other than the window portion and the raised portion can also be appropriately applied to the cover of the first embodiment.

[0125] (Applicable Example) The lid 1 of the second embodiment can be used with a container 150 with a lid, as shown in FIG. 38. FIG. 38 is a cross-sectional view showing an embodiment in which the lid 1 of the second embodiment is joined to the edge 103 of the opening 102 of the container 101 having an opening 102. The joining method between the lid 1 and the container 101 is not particularly limited, and joining methods such as crimping or heat sealing can be appropriately used.

[0126] Container 101 has: a main body having a cylindrical sidewall 104 with a diameter that increases towards the top, and a bottom portion 107, and a space portion 105 formed inside; and an opening 102 at the upper end of the main body (the upper end of the sidewall 104). Although not shown, the opening 102 of container 101 is circular. However, the container 101 shown here is an example and the structure of container 101 is not limited. For example, the opening of the container may also be rectangular. The container is only required to cover the opening with a lid. In addition, the items stored inside the container are not particularly limited, for example, liquid items, solid items, or combinations thereof may be shown.

[0127] In the container shown in FIG. 38, a curled portion 108 is formed on the edge 103 of the opening 102 by rolling the member forming the container body outward, but the container 101 is not limited to this. The end face of the sidewall 104 may also be exposed on the edge 103 of the opening 102, as shown in FIG. 42, and a flange portion 110 extending toward the outside of the opening 102 of the container 101 may also be formed on the edge 103 of the opening 102. In the example of FIG. 42, the container 101 and the lid 1 are joined at the flange portion 110.

[0128] In addition, the cover of the second embodiment can also be combined with a container having an opening.

[0129] The description of the second embodiment can also be applied to the cover of the first embodiment, provided that the effect of the invention is not impaired. The applicable examples can also be applied to the cover of the first embodiment. Furthermore, the description of the first embodiment can also be applied to the cover of the second embodiment, provided that the effect of the invention is not impaired.

[0130] As explained above, the cover 1 of the present invention can be applied to many types of cover 1. Furthermore, it can also be applied to cover 1 in other types besides those described above. The cover of the present invention has been described in detail above, but the above description is merely an example of the cover of the present invention and is not limited thereto. Therefore, appropriate modifications can be made without departing from the spirit of the present invention. Furthermore, regarding the structure of the cover described above, the structures of the cover in each example can be used independently, or the structures of the cover in each example can be appropriately combined and applied.

[0131] The present invention described above includes the following technical ideas. (1) A cover body formed in such a way that it can open and close the mouth of a container, the cover body being characterized in that it has a top surface formed in such a way that it covers the mouth when the cover is closed, the top surface having a small cover piece and an opening formed when the small cover piece is pulled up, a joint portion formed on the small cover piece that engages with one end of a pull tab member, the joint portion being formed on a part of the small cover piece, the pull tab member having a pinch portion formed at the other end and a retaining piece formed between the joint portion and the pinch portion, an insertion portion formed on the top surface for inserting the retaining piece, the retaining piece being formed in such a way that it protrudes from the pull tab member when inserted into the insertion portion, and being formed to be able to be inserted into the insertion portion to maintain the small cover piece in an open state. (2) In the cover body described in (1) above, the top surface has an edge, the small cover piece has a base end near the center of the top surface and a front end on the edge side, and the joint is formed near the front end. (3) In the cover body described in (1) or (2) above, a non-jointing portion is formed between the small cover piece and the pull tab member. (4) In the cover body described in any one of (1) to (3) above, the position where the non-jointing portion is formed is located near the center of the top surface compared to the position where the joint is formed. (5) In the cover body described in any one of (1) to (4) above, the pull tab member has a bent portion formed at the other end side of the joint. (6) In the cover body described in any one of (1) to (5) above, the pull tab member has a main body between the joint and the pinching portion, the retaining piece is formed on the main body and is formed in a manner that protrudes from the main body. (7) In any one of the caps (1) to (6) above, the pinching portion is formed such that it stands upright relative to the main body when the retaining piece protrudes from the main body. (8) In any one of the caps (1) to (7) above, the retaining piece is formed such that it protrudes from the pinching portion side to the joint portion side. (9) In any one of the caps (1) to (8) above, the insertion portion has a main portion for inserting the retaining piece and an auxiliary portion intersecting the main portion. (10) In the cap (9) above, the main portion and the auxiliary portion are continuously formed, and the auxiliary portion is formed such that the direction of the end opposite to the continuous portion that is continuous with the main portion is different. (11) In any one of the caps (1) to (10) above, the pull tab member has a pattern that imitates a human expression on the pinching portion. (12) In the cap (11) above, the pattern is a pattern that has different expressions before and after the retaining piece protrudes.(13) In any one of the lids described in (1) to (12) above, the pull tab member has a display portion for making a predetermined display. (14) In the lid described in (13) above, the display portion has a display indicating the type of contents contained in the container. (15) In the lids described in (13) to (14) above, the display portion is formed on the main body portion and is formed in a manner that allows it to be bent relative to the main body portion. (16) In the lids described in any one of (13) to (15) above, the display portion has a surface and a back surface, and the display is provided on the surface and the back surface. (17) In the lids described in any one of (13) to (16) above, the display portion has a bending auxiliary portion formed at the bending portion relative to the main body portion. (A1) A lid body formed in such a way that it can open and close the opening of a container, the lid body having a top surface portion formed to cover the opening when the container is sealed while it is mounted on the container, the top surface portion having a small cover piece and an opening formed when the small cover piece is pulled up, the lid body having a pull tab member that engages with the small cover piece, the small cover piece having a joint portion that engages with one end of the pull tab member, and the pull tab member having a pinch portion formed at the other end of the pull tab member. (A2) A lid having a engagement area that engages with the periphery of the opening of a container, the lid having a shape that covers the opening when engaged with the container, comprising a small cover piece, a pull tab member engaging with the small cover piece, and an opening formed when the small cover piece is pulled up, the small cover piece being disposed inside the engagement area, one end of the pull tab member engaging with the small cover piece, and, when the engagement portion of the one end piece and the portion near the front end piece is defined as the engagement portion, the pull tab member having a pinching portion formed at the other end piece. (A3) In the lid described in (A1), the pull tab member has a retaining piece formed between the engagement portion and the pinching portion, and is configured such that when the small cover piece is opened by pinching the pinching portion, the retaining piece protrudes from the pull tab member, an insertion portion is formed on the top surface for inserting the protruding retaining piece, and is configured such that the retaining piece can be inserted into the insertion portion to maintain the small cover piece in an open state. (A4) In the cover described in (A2) above, the pull tab member has a retaining piece formed between the joint and the gripping portion, and is configured such that when the gripping portion is pinched to open the small cover, the retaining piece protrudes from the pull tab member, and an insertion portion is formed for inserting the protruding retaining piece, and is configured such that the retaining piece can be inserted into the insertion portion to maintain the small cover in an open state. (A5) In the cover described in (A3) or (A4) above, the gripping portion is formed in such a way that it stands upright when the retaining piece is inserted into the insertion portion.(A6) In any one of the caps described in (A3) to (A5), the retaining tab is formed such that it protrudes from the gripping portion side toward the joining portion side. (A7) In any one of the caps described in (A3) to (A6), the insertion portion has a main portion for inserting the retaining tab and an auxiliary portion intersecting the main portion. (A8) In any one of the caps described in (A3) to (A7), the pull tab member has a pattern that imitates a human expression on the gripping portion. (A9) In the cap described in (A8), the pattern undergoes a three-dimensional change before and after the retaining tab protrudes. (A10) In the cap described in (A2), in the state of being joined with the container, it has an exposed surface, at least a portion of the outer periphery of the small cap extends along the inner edge of the joining area, and is formed further outward than the intersection of the exposed surface in the state of being joined with the container and the extended surface of the inner periphery of the container. (A11) In any of the above-described (A1) to (A10) lids, in the closed state of the small cover, there is a facing surface opposite to the outer peripheral end face of the small cover, and when the small cover is opened from the closed state, at least a portion of the outer peripheral end face rubs against the facing surface. (A12) In any of the above-described (A1) to (A11) lids, a window is formed on the top surface. (A13) In any of the above-described (A1) to (A12) lids, the top surface has a raised portion, at least a portion of which is raised. (A14) In any of the above-described (A1) to (A13) lids, they are formed of paper material. (A15) A combination of a container and a lid, comprising a container having a mouth and a lid as described in any of the above-described (A1) to (A14). (A16) A container with a cover, comprising a container having an opening and a cover as described in any one of (A1) to (A14) above, wherein the opening of the container is covered by the cover. [Simplified Explanation of the Diagram]

[0010] [Fig. 1](a) and Fig. 1(b) are perspective views showing the appearance of an embodiment of the cover (first embodiment) of the present invention. [Fig. 2] is a perspective view showing the operation of opening the small cover. [Fig. 3](a) and Fig. 3(b) are perspective views showing the appearance of the cover with the opening open. [Fig. 4] is a top view showing the cover with the small cover closed. [Fig. 5] is a top view showing the cover with the small cover open. [Fig. 6](a) is a sectional view along line AA in Fig. 1(a), and Fig. 6(b) is a partial enlarged view of Fig. 6(a). [Fig. 7](a) and Fig. 7(b) are explanatory diagrams for explaining the structure and function of the pull tab member. [Fig. 8](a), Fig. 8(b), and Fig. 8(c) are explanatory diagrams for explaining the operation of opening the small cover. [Fig. 9] is an explanatory diagram for explaining the state of the cover installed on the container. [Fig. 10] is an explanatory diagram for explaining the effect of installing the cover on the container. [Fig. 11] is an explanatory diagram showing the stacked state of the covers. [Fig. 12] (a) to 12 (g) are explanatory diagrams illustrating other configurations of the small cover pieces. [Fig. 13] (a) and 13 (b) are perspective views and longitudinal sectional views showing a first modified example of the cover of this embodiment. [Fig. 14] (a) to 14 (e) are explanatory diagrams showing other configurations of the cover structure. [Fig. 15] (a) to 15 (d) are explanatory diagrams showing other configurations of the cover structure. [Fig. 16] (a) to 16 (e) are explanatory diagrams showing other configurations of the cover structure. [Fig. 17] (a) to 17 (e) are explanatory diagrams showing other configurations of the cover structure. [Fig. 18] (a) to 18 (d) are explanatory diagrams showing other configurations of the cover structure. [Fig. 19] (a) to 19 (e) are explanatory diagrams showing other configurations of the cover structure. [Fig. 20](a) and [Fig. 20](b) are explanatory diagrams showing other structural configurations of the cover. [Fig. 21] is a perspective view showing other structural configurations of the cover. [Fig. 22] is an external perspective view showing other configurations of the insert portion of the cover. [Fig. 23](a) is an external perspective view showing other configurations of the insert portion of the cover, and [Fig. 23](b) is an external perspective view showing other structural configurations of the cover. [Fig. 24](a) is a top view showing the structure of a cover with a pull tab member of another configuration, and [Fig. 24](b) is an external perspective view of the cover shown in [Fig. 24](a) is a top view showing the structure of a cover with a pull tab member of another configuration, and [Fig. 25](b) is an external perspective view of the cover shown in [Fig. 25](a) is a top view showing the structure of a cover with a pull tab member of another configuration, and [Fig. 26](a) is a top view showing the structure of a cover with a pull tab member of another configuration, and [Fig. 26](b) is an external perspective view of the cover shown in [Fig. 26](a) is a top view showing the structure of a cover with a pull tab member of another configuration, and [Fig. 26](b) is an external perspective view of the cover shown in [Fig. 26](a). [Figure 27] is a perspective view showing the structure of a cover with a pull tab member in other ways.[Fig. 28](a) is a top view illustrating an embodiment of the cover of the second embodiment of the present invention, and Fig. 28(b) is a cross-sectional view of Fig. 28(a) along line BB. [Fig. 29] is a top view illustrating an embodiment of the cover of the second embodiment of the present invention. [Fig. 30](a) is a top view illustrating an embodiment of the cover of the second embodiment of the present invention, and Fig. 30(b) is a cross-sectional view of Fig. 30(a) along line CC. [Fig. 31] is a top view illustrating an embodiment of the cover of modified example 2 of the second embodiment of the present invention. [Fig. 32] is a cross-sectional view of the main part of an embodiment of the cover of the second embodiment of the present invention. [Fig. 33](a) is a top view illustrating an embodiment of the cover of modified example 1 of the second embodiment of the present invention, and Fig. 33(b) is a cross-sectional view of Fig. 33(a) along line DD. [Fig. 34](a) and Fig. 34(b) are top views illustrating an embodiment of the cover of modified example 3 of the second embodiment of the present invention. [Fig. 35] is a cross-sectional view of the main part of an embodiment of the cover of the second embodiment of the present invention. [Fig. 36] is a cross-sectional view of the main part of an embodiment of the cover of the second embodiment of the present invention. [Fig. 37](a) is a top view of an embodiment of the cover of modified example 4 of the second embodiment of the present invention, and Fig. 37(b) is a cross-sectional view of Fig. 37(a) along line EE. [Fig. 38] is a cross-sectional view of an embodiment of the container with the cover. [Fig. 39] is a top view of an embodiment of the cover of the second embodiment of the present invention. [Fig. 40](a) is a cross-sectional view of an embodiment of the cover of the second embodiment of the present invention, and Fig. 40(b) is a partial enlarged view of the area indicated by X in Fig. 40(a). [Fig. 41](a) is a top view of an embodiment of the cover of modified example 5 of the second embodiment of the present invention, and Fig. 41(b) is a cross-sectional view of Fig. 41(a) along line FF. [Fig. 42] is a cross-sectional view of an embodiment of the container with the cover. [Fig. 43] is a cross-sectional view of an embodiment of the container with the cover. [Fig. 44] is a cross-sectional view of an embodiment of the container with the cover. [Fig. 45](a) and 45(b) are top views illustrating an embodiment of the cover of Modified Example 2 of the second embodiment of the present invention. [Fig. 46](a) is a top view illustrating an embodiment of the cover of Modified Example 6 of the second embodiment of the present invention, and 46(b) is a cross-sectional view illustrating an embodiment of the cover of Modified Example 6 of the second embodiment of the present invention. [Fig. 47] is a top view illustrating an embodiment of the cover of the present invention. [Fig. 48] is a top view illustrating an embodiment of the cover of the present invention. [Fig. 49](a) and 49(b) are top views illustrating an embodiment of the cover of the present invention.[Fig. 50](a) and [Fig. 50](b) are explanatory diagrams illustrating one embodiment of the cover of the second embodiment of the present invention. [Fig. 51] is a top view illustrating one embodiment of the cover of modified example 7 of the second embodiment of the present invention. [Fig. 52] is an explanatory diagram illustrating one embodiment of the cover of modified example 8 of the second embodiment of the present invention. [Fig. 53](a) is a top view showing the structure of a cover having a pull tab member of another type, and [Fig. 53](b) is a diagram illustrating an example of using the cover having the pull tab member shown in [Fig. 53](a). [Fig. 54] is a top view showing the structure of a cover having a pull tab member of another type. [Fig. 55](a) is a top view illustrating an example of using the cover shown in [Fig. 54], and [Fig. 55](b) is a cross-sectional view of [Fig. 55](a) along line HH. [Fig. 56] is a top view illustrating one embodiment of the cover of a modified example of the second embodiment of the present invention.

Claims

1. A lid body formed in a manner capable of opening and closing the opening of a container, the lid body having a top surface portion formed to cover the opening when the container is sealed while mounted on the container, the top surface portion having a small cover piece and an opening formed when the small cover piece is pulled up, the lid body having a pull tab member engaging with the small cover piece, a joint portion formed on the small cover piece engaging with one end of the pull tab member, a pinch portion formed at the other end of the pull tab member, the pull tab member having a retaining piece formed between the joint portion and the pinch portion, and configured such that when the small cover piece is opened by pinching the pinch portion, the retaining piece protrudes from the pull tab member, an insertion portion is formed on the top surface portion for inserting the protruding retaining piece, and configured such that the retaining piece can be inserted into the insertion portion to maintain the small cover piece in an open state.

2. A lid having an engagement region that engages with the periphery of the opening of a container, and the lid having a shape that covers the opening when engaged with the container, comprising a small cover piece, a pull tab member engaging with the small cover piece, and an opening formed when the small cover piece is pulled up, the small cover piece being disposed inside the engagement region, one end of the pull tab member engaging with the small cover piece, wherein, when the engagement portion between the one end and a portion near the front end is defined as the engagement portion, the pull tab member having a pinching portion formed at the other end of the pull tab member, the pull tab member having a retaining piece formed between the engagement portion and the pinching portion, and being configured such that when the small cover piece is opened by pinching the pinching portion, the retaining piece protrudes from the pull tab member, and an insertion portion is formed for inserting the protruding retaining piece, and configured such that the retaining piece can be inserted into the insertion portion to maintain the small cover piece in an open state.

3. The cover as described in claim 1 or 2, wherein, The aforementioned gripping portion is formed in such a way that it stands upright when the aforementioned retaining piece is inserted into the aforementioned insertion portion.

4. The cover as described in claim 1 or 2, wherein, The aforementioned retaining piece is formed in such a way that it protrudes from the aforementioned pinching portion side toward the aforementioned joint portion side.

5. The cover as described in claim 1 or 2, wherein, The aforementioned insertion portion has a main portion for inserting the aforementioned retaining piece, and an auxiliary portion that intersects with the aforementioned main portion.

6. The cover as described in claim 1 or 2, wherein, The aforementioned pull tab component has a pattern that imitates a human facial expression on the aforementioned gripping part.

7. The cover as described in claim 6, wherein, The above pattern undergoes a three-dimensional change before and after the aforementioned retaining piece protrudes.

8. The cover as described in claim 2, wherein, Having an exposed surface in the state of engagement with the container, at least a portion of the outer periphery of the small cover extends along the inner edge of the engagement area and is formed further outward than the intersection of the exposed surface in the state of engagement with the container and the extended surface of the inner periphery of the container.

9. The cover as described in claim 1 or 2, wherein, In the closed state of the small cover, there is a facing surface opposite to the outer peripheral end face of the small cover. When the small cover is opened from the closed state, at least a portion of the outer peripheral end face rubs against the facing surface.

10. The cover as described in claim 1 or 2, wherein, A window is formed on the aforementioned top surface.

11. The cover as described in claim 1 or 2, wherein, The aforementioned top surface has at least a raised portion.

12. The cover as described in claim 1 or 2, wherein, The cover is made of paper.

13. A combination of a container and a lid, comprising a container having an opening and a lid as described in claim 1 or 2.

14. A container with a cover, comprising a container having an opening and a cover as described in claim 1 or 2, wherein the opening of the container is covered by the cover.

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