Self-supporting retainer for bag

Abstract

To provide a self-supporting retainer that can hold even a small flat bag having no bottom gore to support itself with a bottom gore of the bag increased and also put the bag back into a flat state when the bag need not support itself.SOLUTION: There is provided a self-supporting retainer 10 for a bag that connects two bottom corner parts 3, folded in bottom center directions so that bottom gores 2 of the bag 1 increase, in a connection-releasable state. The self-supporting retainer 10 preferably has two grip parts A gripping the bottom corner parts 3 in a gripping-releasable state. A grip part which holds or locks a bottom corner part 3 is exemplified as the grip parts A.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a self-standing retainer for maintaining the self-standing state of a bag.

Background Art

[0002] A flat bag without a bottom mat or with a small bottom mat does not naturally stand on its own and will fall over and lie on its side, thus having the following problems. (A) When the bag lies on its side, it takes up space. (B) When the bag lies on its side, the contents are likely to spill out. (C) When the bag lies on its side, the opening is likely to narrow, making it difficult to see inside. (D) When the bag lies on its side, it is difficult to put a hand into the narrowed opening, and at that time, the bag is likely to shift horizontally, making it difficult to take out the contents. Also, when the contents are confectionery or the like, oil, powder, etc. attached to the inner surface of the narrowed bag are likely to stick to the hand. (E) To make it easier to put a hand in and take out the contents, it is necessary to lift or spread the bag, and both hands must be used. (F) When the bag lies on its side, it looks bad when taking a photo.

[0003] As a technique for making such a flat bag self-standing, Patent Document 1 describes that a double-sided adhesive tape with a length reaching the middle position of both outer surfaces is pre-installed at the center of the bottom edge of a confectionery bag in a state with release paper attached, and when taking out the contents, the release paper is removed and the adhesive surface is adhered to the floor surface. According to this, the confectionery bag can be made to stand on its own, the opening can be widened, and the contents can be taken out with one hand. However, when a part of the contents remains, it is difficult to peel the adhesive surface from the floor surface and continue to handle the confectionery bag in a non-self-standing state because the adhesive surface is exposed. Also, when all the contents are taken out, the confectionery bag is considered to be discarded together with the double-sided adhesive tape, and it is difficult to peel off the double-sided adhesive tape and reuse it.

[0004] In addition, Patent Document 2 describes that two strip-shaped thick paper pieces are overlapped, the central part is fixed with a dove-tail hole, and it can be rotated and unfolded in a cross shape, and then pasted on the bottom of a polyethylene dust bag. According to this, the bottom surface of the dust bag can be easily expanded and internally installed in an outer container. However, after the dust is contained, the dust bag is considered to be discarded together with the strip-shaped thick paper piece, and it is difficult to peel off the strip-shaped thick paper piece and reuse it.

[0005] In addition, Patent Document 3 describes a grain bag in which each corner part at the bottom of a flat bag body is folded in half orthogonally to the front side part and the rear side part to form a protruding triangular part, the lower side thereof is sewn, short sides are arranged side by side at the bottom of the bag body, and the two triangular parts are bent so that the tips face each other, and further, a tape piece such as a woven fabric having an appropriate width and toughness is sewn across between the tips to be stretched and integrated. According to this, the bottom of the bag body is flat, and when storing grains, the grains reach the lower part of the bag body. However, since the bag body is sewn for arranging the short sides and the tape piece is also sewn to the two triangular parts, the bag body cannot be returned to a flat state for use, and only the tape piece cannot be used elsewhere.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, an object of the present invention is to provide a self-supporting holder that can hold and make a flat bag without or with a small bottom mat stand on its own with an increased bottom mat, and can return the bag to a flat state when self-support is not required. [Means for Solving the Problem]

[0008] [1] A self-standing retainer for a bag that releasably connects two bottom corner portions folded toward the center of the bottom so that the bottom margin of the bag increases.

[0009] [2] The self-standing retainer for a bag according to [1], wherein the self-standing retainer has two gripping portions that grip the bottom corner portions in a releasable manner.

[0010] [3] The self-standing retainer for a bag according to [2], wherein the gripping portion sandwiches the bottom corner portion.

[0011] [4] The sandwiching in [3] is by pushing, screwing, elastic force or magnetic adsorption force. The self-standing retainer for a bag according to [3].

[0012] [5] The gripping portion in [2] is for hooking the bottom corner portion. The self-standing retainer for a bag according to [2].

[0013] [6] The hooking in [5] is by a slit. The self-standing retainer for a bag according to [5].

[0014] [7] The self-standing retainer for a bag according to any one of [1] to [6], wherein the self-standing retainer is composed of one or two parts formed using a polymer material or metal. [Advantages of the Invention]

[0015] According to the self-standing retainer for a bag of the present invention, even a flat bag without a bottom margin or with a small bottom margin can be held in a state where the bottom margin of the bag is increased and made to stand on its own, and when self-standing is not required, the bag can be returned to a flat state. [Brief Description of the Drawings]

[0016]

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Embodiments for Carrying out the Invention

[0017] 1. Bag The bottom mat of the bag is not particularly limited, but the present invention is particularly effective for bags without a bottom mat or with a small one (for example, the mat width is 20 mm or less). The material of the bag is not particularly limited, and examples thereof include cloth, polymer materials (resins, rubbers, elastomers, etc.), paper, etc., and combinations thereof may also be used. The surface structure of the bag is not particularly limited, and examples thereof include a sheet (smooth or clogged), a net (a meshed net), etc. The use of the bag is not particularly limited, and examples thereof include a bag for containing small items (coins, dice, tokens, etc.) used in board games, a snack bag, an envelope, a kitchen net bag, etc. The bottom corner part of the bag refers to the bottom corner point and the vicinity thereof.

[0018] 2. Self-standing holder The material of the self-standing holder is not particularly limited, and examples thereof include polymer materials (resins, rubbers, elastomers, etc.), metals, ceramics, wood, paper, etc., and combinations thereof may also be used. The structure of the self-standing holder is not particularly limited, but as described above, those having two gripping parts are preferred. The shape of the self-standing holder is not particularly limited, and examples thereof include circular, oval, elliptical, polygonal, etc. in plan view. The shape of the self-standing holder used for the bag for containing small items used in the board game is preferably circular to fit the shape of the small items. The thickness of the self-standing holder is not particularly limited, but in order to stably self-stand the bag so as not to be bulky at the bottom mat, it is preferably 8 mm or less, more preferably 5 mm or less, even more preferably 3 mm or less, and most preferably 3 mm or less and a plate-shaped self-standing holder.

[0019] 3. Gripping part The method of gripping the bottom corner part by the gripping part is not particularly limited, and examples thereof include the above-mentioned clamping type, hooking type, and inserting with a pointed object such as a pin. The distance between the two gripping parts is not particularly limited. Therefore, the two bottom corner points may contact each other during gripping, may be close to, for example, less than 20 mm, or may be separated by, for example, 20 mm or more.

Example

[0020] Embodiments of the present invention will be described with reference to the drawings. Note that the structures, materials, numerical values, shapes, and dimensions described in the embodiments are examples and can be appropriately changed without departing from the gist of the invention.

[0021] As shown in FIG. 2(a) and the like, the bag 1 in the illustrated example is formed flat with cloth, and the bottom gusset 2 is about the amount of the curvature of the cloth and can be said to be substantially non-existent. The bag 1 is not sewn for arranging short sides side by side as in Patent Document 3. Further, this bag 1 is a so-called drawstring bag that tightens the opening with a cord (string), and is suitable for taking in and out small items for board games, for example, and is formed in a size that can easily hold one hand.

[0022] In each embodiment, two bottom corner portions 3 folded in the direction of the center of the bottom so that the bottom gusset 2 of the bag 1 increases are detachably connected.

[0023] [Embodiment 1] The self-standing holder 10 of Embodiment 1 shown in FIGS. 1 to 4 is integrally formed of resin with a lower member 11, an annular upper member 14, and a connecting member 18 that connects these at one location. The thickness of the self-standing holder 10 when the upper member 14 is pushed into the lower member 11 (without sandwiching the bottom corner portion 3) is 7 mm.

[0024] The lower member 11 includes a disc-shaped lower base 12 and two fan-shaped lower convex portions 13 formed on the 180° diametrically opposite sides with respect to the center of the upper surface of the lower base 12. Two lower concave portions are relatively formed between both lower convex portions 13 and continue to the shallow recess on the upper surface of the lower base 12. This recess has a function of making it more difficult for the gripped bottom corner portion 3 to come out and releasing the thickness of the cloth of the bag, but gripping is possible even without it.

[0025] The upper member 14 includes a perforated disc-shaped upper base 15 and two fan-shaped upper convex portions 16 formed on the 180° diametrically opposite sides with respect to the center of the hole of the upper base 15. Two upper concave portions (holes) are relatively formed between both upper convex portions 16. A knob 17 is formed at one location on the outer periphery of the upper base 15.

[0026] Then, as shown in FIGS. 3(c), 4(a), and 4(b), when the upper member 14 is pushed into the lower member 11 such that the lower convex portion 13 and the upper convex portion 16 mesh and fit together, the upper surface of the lower base portion 12 (the shallow dent) and the lower surface of the upper convex portion 16 function as a gripping portion A that sandwiches the bottom corner portion 3 of the bag 1 by the pushing force.

[0027] The procedure for holding the self-standing state of the bag by the self-standing retainer 10 configured as described above is as follows. 1. As shown in FIG. 2(a), the bag 1 is turned upside down. 2. As shown in FIG. 2(b), the two bottom corner portions 3 of the bag are pinched into a triangular shape in side view so that the bottom gusset 2 increases. 3. As shown in FIG. 3(a), the self-standing retainer 10 with the open upper member 14 is placed on the bottom gusset 2. 4. As shown in FIG. 3(b), the two bottom corner portions 3 are folded toward the center of the bottom and placed on the upper surface of the lower base portion 12 between the lower convex portions 13. 5. As shown in FIG. 3(c), when the upper member 14 is closed and fitted to the lower member 11, and the two bottom corner portions 3 are gripped by the two gripping portions A, the two bottom corner portions 3 are connected. In this way, the two bottom corner portions 3 can be easily connected simply by gripping them with the gripping portions A, without the laborious sewing as in Patent Document 3. 6. As shown in FIG. 4(c), the bag 1 is turned right side up and made to stand on its own. Since the self-standing retainer 10 maintains the increased bottom gusset 2 as described above, it can hold the self-standing state of the bag 1.

[0028] In this way, since the self-standing retainer 10 holds the self-standing state of the bag 1, the following operational effects can be obtained. (Sa) When the bag is vertical, it does not take up space. (Shi) When the bag is vertical, the contents are less likely to spill. (Su) When the bag is vertical, the opening is kept wide, making it easy to see inside. (Se) When the bag is vertical, it is easy to put a hand into the wide opening, and at that time, the bag is less likely to shift horizontally, making it easy to take out the contents. Also, when the contents are confectionery or the like, oil, powder, etc. attached to the inner surface of the bag are less likely to stick to the hand. (So) Since it is easy to access and take out the contents as described above, there is no need to lift or spread the bag, and it can be done with one hand. (Ta) When the bag is vertical, it looks good in photos. (Chi) A bag without a bottom gusset or with a small bottom gusset (compared to a bag with a large bottom gusset) can be made to stand on its own at a lower cost.

[0029] Also, to release the connection of the two bottom corners 3 by the self-standing retainer 10, as shown in FIGS. 3(c) to (b), open the upper member 14, disengage the fitting with the lower member 11, and release the gripping of the two bottom corners 3. The self-standing retainer 10 comes off the bag 1. Then, the pinched two bottom corners 3 can be restored. In this way, since the connection of the two bottom corners 3 can be easily released only by releasing the gripping at the gripping portion A, the following operational effects can be obtained.

[0030] (Na) The bag can be flattened for use or stored with high space efficiency. (Ni) When disposing of the bag or the like, the bag alone can be easily separated simply by removing the self-standing retainer. (Nu) The self-standing retainer can be repeatedly used with the same bag or another bag. (Ne) The self-standing retainer can be formed using a highly durable material such as a polymer material or metal, and thus can be used semi-permanently.

[0031] [Example 2] Next, the self-standing retainer 20 of Example 2 shown in FIGS. 5 to 7 is formed by integrally molding a lower member 21, an annular upper member 24, and a connecting member 28 that connects these at one location with resin. The lower member 21 is the same as the lower member 11 of Example 1 and includes a lower base portion 22 and a lower convex portion 23. The upper member 24 is annular. The thickness of the self-standing retainer 20 when the upper member 24 is pushed into the lower member 21 (without sandwiching the bottom corner 3) is 7 mm.

[0032] Then, as shown in FIGS. 6(c), 7(a), and 7(b), when the upper member 24 is pushed into the lower member 21 so as to fit around the lower convex portion 23, the upper surface near the periphery of the lower base portion 12 and the lower surface of the upper member 24 function as a gripping portion A that sandwiches the bottom corner portion 3 of the bag 1 by the pushing force.

[0033] The procedure for holding the self-standing of the bag by the self-standing retainer 20 configured as described above is as follows after the same steps as in 1. and 2. (FIGS. 2(a) and 2(b)) of Example 1. 3. As shown in FIG. 6(a), place the self-standing retainer 20 with the upper member 24 open on the bottom mat 2. 4. As shown in FIG. 6(b), fold the two bottom corner portions 3 toward the center of the bottom and place them on the upper surface of the lower base portion 22 between the lower convex portions 23. 5. As shown in FIG. 6(c), close the upper member 24 and fit it into the lower member 21, and grip the two bottom corner portions 3 with the two gripping portions A, then the two bottom corner portions 3 are connected. In this way, the two bottom corner portions 3 can be easily connected only by gripping them with the gripping portion A, without the laborious sewing as in Patent Document 3. Then, similar to 6. (FIG. 4(c)) of Example 1, turn the bag 1 upside down and right side up to make it stand on its own.

[0034] Also, to release the connection of the two bottom corner portions 3 by the self-standing retainer 20, as shown in FIGS. 6(c) to 6(b), open the upper member 24 to disengage it from the lower member 21 and release the gripping of the two bottom corner portions 3. The self-standing retainer 20 comes off the bag 1. And the pinched two bottom corner portions 3 can be restored. In this way, the two bottom corner portions 3 can be easily disconnected only by releasing the gripping by the gripping portion A, and the same operational effects as in Example 1 can be obtained.

[0035] [Example 3] Next, the self-standing holder 30 of Example 3 shown in FIGS. 8 to 10 is formed by separately molding a lower member 31 and an annular upper member 34 with resin. The lower member 31 includes a disk-shaped lower base 32 and two fan-shaped lower convex portions 33 formed on opposite sides 180° with respect to the center of the upper surface of the lower base 32. The upper member 34 is annular. A male thread 35 is formed on the outer periphery of the lower convex portion 33, and a female thread 36 is formed on the inner periphery of the upper member 34 so that they can be screwed together. A ridge 37 is formed on the upper surface near the periphery of the lower base 32, and a groove 38 is formed on the lower surface of the upper member 34 so that they can face each other. The ridge 37 and the groove 38 make it more difficult for the gripped bottom corner portion 3 to come off, but gripping is possible even without them. The thickness of the self-standing holder 20 when the upper member 34 is screwed onto the lower member 31 (without sandwiching the bottom corner portion 3) is 7 mm.

[0036] Then, as shown in FIGS. 9(c), 10(a), and 10(b), when the upper member 34 is screwed around the lower convex portion 33 of the lower member 31, due to the screwing force, the upper surface near the periphery of the lower base 32 and the lower surface of the upper member 34 function as a gripping portion A that sandwiches the bottom corner portion 3 of the bag 1.

[0037] The procedure for holding the self-standing of the bag by the self-standing holder 30 configured as described above is the same as in 1. and 2. of Example 1 (FIGS. 2(a) and 2(b)), and then is as follows. 3. As shown in FIG. 9(a), place the lower member 31 on the bottom mat 2. 4. As shown in FIG. 9(b), fold the two bottom corner portions 3 toward the center of the bottom and place them on the upper surface of the lower base 32 between the lower convex portions 33. 5. As shown in FIG. 9(c), screw the upper member 34 onto the lower member 31 and grip the two bottom corner portions 3 with the two gripping portions A, then the two bottom corner portions 3 will be connected. In this way, the two bottom corner portions 3 can be easily connected just by gripping them with the gripping portions A, so it does not require the labor such as sewing in Patent Document 3. Then, in the same manner as in 6. of Example 1 (FIG. 4(c)), turn the bag 1 upside down to make it stand on its own.

[0038] Also, to release the connection of the two bottom corner portions 3 by the self-standing holder 30, as shown in FIGS. 9(c) to (b), the upper member 34 is screwed out and removed from the lower member 31, and the gripping of the two bottom corner portions 3 is released. The self-standing holder 30 comes off from the bag 1. Then, the pinched two bottom corner portions 3 can be restored. In this way, since the two bottom corner portions 3 can be easily disconnected only by releasing the gripping at the gripping portion A, the same operational effects as in the first embodiment can be obtained.

[0039] [Fourth Embodiment] Next, the self-standing holder 40 of the fourth embodiment shown in FIGS. 11 to 13 is formed by separately molding a lower member 41 and an annular upper member 44 with resin. The lower member 41 includes a disk-shaped lower base portion 42 and two semi-columnar lower convex portions 43 formed on the 180° diametrically opposite sides with respect to the center of the upper surface of the lower base portion 42. The upper member 44 is annular. A ridge 47 is formed on the upper surface near the periphery of the lower base portion 42, and a groove 48 is formed on the lower surface of the upper member 44 so as to face each other. The ridge 47 and the groove 48 make it more difficult for the gripped bottom corner portion 3 to come off, but gripping is possible even without them. The thickness of the self-standing holder 40 when the upper member 44 is pushed into the lower member 41 (without sandwiching the bottom corner portion 3) is 7 mm.

[0040] Then, as shown in FIGS. 12(c), 13(a) and (b), when the upper member 44 is pushed into the lower member 41 so as to fit around the bottom corner portion 3 with the bottom corner portion 3 sandwiched around the lower convex portion 43, the outer peripheral surface of the lower convex portion 43 and the inner peripheral surface of the upper member 44, and also the upper surface near the periphery of the lower base portion 42 and the lower surface of the upper member 44 cooperate to function as a gripping portion A that sandwiches the bottom corner portion 3 of the bag 1.

[0041] The procedure for holding the self-standing state of the bag by the self-standing holder 40 configured as described above is as follows after the same steps as in 1. and 2. (FIGS. 2(a) and (b)) of the first embodiment. 3. As shown in FIG. 12(a), place the lower member 41 on the bottom mat 2. 4. As shown in FIG. 12(b), fold the two bottom corner portions 3 toward the center of the bottom and place them on the upper surface of the lower convex portion 43. 5. As shown in Fig. 12(c), when the upper member 44 is fitted to the lower member 41 and the two bottom corners 3 are gripped by the two gripping portions A, the two bottom corners 3 are connected. In this way, since the two bottom corners 3 can be easily connected only by gripping them with the gripping portion A, it does not require the laborious work such as sewing in Patent Document 3. And, in the same manner as in 6. (Fig. 4(c)) of the first embodiment, the bag 1 is turned upside down to stand on its own.

[0042] Further, in order to release the connection of the two bottom corners 3 by the self-standing retainer 40, as shown in Figs. 12(c) to (b), the upper member 44 is pulled out from the lower member 41 and removed, and the gripping of the two bottom corners 3 is released. The self-standing retainer 40 comes off from the bag 1. And the pinched two bottom corners 3 can be restored to their original state. In this way, since the connection of the two bottom corners 3 can be easily released only by releasing the gripping by the gripping portion A, the same operational effects as in the first embodiment can be obtained.

[0043] [Embodiment 5] Next, the self-standing retainer 50 of the fifth embodiment shown in Figs. 14 and 15 is composed of a disc-shaped main body 51 formed of resin or metal, and two spring pieces 52 formed by cutting, for example, in a tongue shape (cantilever shape) on the 180° opposite side with respect to the center of the main body 51. The spring pieces 52 can be elastically bent in the vertical direction by the elasticity of resin or metal. The thickness of the self-standing retainer 50 is 1 to 2 mm.

[0044] And, as shown in Figs. 15(b) and (c), when the bottom corner 3 is inserted while bending the spring piece 52 away from the main body 51, the boundary between the spring piece 52 and the main body 51 functions as a gripping portion A that sandwiches the bottom corner 3 of the bag 1 by the elastic force with which the spring piece 52 tries to elastically return.

[0045] The procedure for holding the self-standing state of the bag by the self-standing retainer 50 configured as described above is the same as in 1. and 2. (Figs. 2(a) and (b)) of the first embodiment, and then is as follows. 3. As shown in Fig. 15(a), the self-standing retainer 50 is arranged on the bottom mat 2. 4. As shown in FIGS. 15(b) and (c), by folding the two bottom corner portions 3 toward the center of the bottom and inserting them between the spring piece 52 and the main body 51, and gripping the two bottom corner portions 3 with the two gripping portions A, the two bottom corner portions 3 are connected. In this way, since the two bottom corner portions 3 can be easily connected only by gripping them with the gripping portion A, it does not require the laborious sewing as in Patent Document 3. Then, in the same manner as in 6. (FIG. 4(c)) of the first embodiment, the bag 1 is rotated forward and backward to stand on its own.

[0046] Also, to release the connection of the two bottom corner portions 3 by the self-standing retainer 50, as shown in FIGS. 12(b) to (a), the two bottom corner portions 3 are pulled out from between the spring piece 52 and the main body 51 and removed, and the gripping of the two bottom corner portions 3 is released. The self-standing retainer 50 is detached from the bag 1. And the pinched two bottom corner portions 3 can be restored. In this way, since the two bottom corner portions 3 can be easily disconnected only by releasing the gripping by the gripping portion A, the same operational effects as in the first embodiment can be obtained.

[0047] [Embodiment 6] Next, the self-standing retainer 60 of Embodiment 6 shown in FIGS. 16 and 17 is composed of a disk-shaped main body 61 formed of resin and two slits 62 formed at 180° opposite sides with respect to the center of the main body 61. The thickness of the self-standing retainer 60 is 1 to 2 mm.

[0048] And as shown in FIGS. 16(b) and (c), when the bottom corner portion 3 is inserted into the slit 62 and bent above and below it, the slit 62 for inserting and bending the bottom corner portion 3 in this way functions as a gripping portion A for hooking the bottom corner portion 3 of the bag 1.

[0049] The procedure for holding the self-standing of the bag by the self-standing retainer 60 configured as described above is as follows after the same procedures as in 1. and 2. (FIGS. 2(a) and (b)) of the first embodiment. 3. As shown in FIG. 17(a), the self-standing retainer 60 is arranged on the bottom mat 2. 4. As shown in FIGS. 17(b) and (c), if the two bottom corner portions 3 are folded inward toward the center of the bottom, inserted into the slit 62 and bent, and the two bottom corner portions 3 are gripped by the two gripping portions A, the two bottom corner portions 3 will be connected. In this way, since the two bottom corner portions 3 can be easily connected only by gripping them with the gripping portions A, it does not require the laborious sewing as in Patent Document 3. Then, in the same manner as in 6. (FIG. 4(c)) of the first embodiment, the bag 1 is turned upside down to stand on its own.

[0050] Also, to release the connection of the two bottom corner portions 3 by the self-standing retainer 60, as shown in FIGS. 17(b) to (a), the two bottom corner portions 3 are removed from the slit 62 and released from the grip, and the grip on the two bottom corner portions 3 is released. The self-standing retainer 60 is detached from the bag 1. And the pinched two bottom corner portions 3 can be restored to their original state. In this way, since the connection of the two bottom corner portions 3 can be easily released only by releasing the grip by the gripping portion A, the same operational effects as in the first embodiment can be obtained.

[0051] [Embodiment 7] Next, the self-standing retainer 70 of the seventh embodiment shown in FIGS. 18 and 19 includes the same main body 71 and two slits 72 as in the sixth embodiment, and two fan-shaped convex portions 73 integrally formed on the 180° diametrically opposite side with respect to the center of the upper surface of the main body 71. The thickness of the self-standing retainer 70 is 4 mm.

[0052] And, as shown in FIGS. 19(b) and (c), when the bottom corner portion 3 is inserted into the slit 72 and bent above and below it, the slit 72 for inserting and bending the bottom corner portion 3 in this way functions as a gripping portion A for latching the bottom corner portion 3 of the bag 1. Also, the space between the two convex portions 73 functions as a space for accommodating the bent tip portion of the bottom corner portion 3.

[0053] The procedure for holding the self-standing state of the bag by the self-standing retainer 70 configured as described above is the same as in 1. and 2. (FIGS. 2(a) and (b)) of the first embodiment, and then is as follows. 3. As shown in FIG. 19(a), the self-standing retainer 70 is disposed on the bottom mat 2. 4. As shown in FIGS. 19(b) and (c), if the two bottom corner portions 3 are folded in the direction of the bottom center, inserted into the slit 72 and bent, and the two bottom corner portions 3 are gripped by the two gripping portions A, the two bottom corner portions 3 will be connected. In this way, since the two bottom corner portions 3 can be easily connected only by gripping them with the gripping portion A, it does not require the laborious sewing as in Patent Document 3. Then, in the same manner as in 6. (FIG. 4(c)) of the first embodiment, the bag 1 is turned upside down to stand on its own.

[0054] Also, to release the connection of the two bottom corner portions 3 by the self-standing retainer 70, as shown in FIGS. 19(b) to (a), the two bottom corner portions 3 are removed from the slit 72 and released from the grip, and the grip on the two bottom corner portions 3 may be released. The self-standing retainer 70 comes off the bag 1. And the two pinched bottom corner portions 3 can be returned to their original state. In this way, since the connection of the two bottom corner portions 3 can be easily released only by releasing the grip by the gripping portion A, the same operational effects as in the first embodiment can be obtained.

[0055] Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified and embodied without departing from the gist of the invention.

Explanation of Reference Numerals

[0056] 1 Bag 2 Bottom mat 3 Bottom corner portion 10, 20, 30, 40, 50, 60, 70 Self-standing retainer A Gripping portion

Claims

**Claim 1** A self-standing retainer for a bag that releasably connects two bottom corners folded toward the center of the bottom so that the bottom margin of the bag increases. **Claim 2** The self-standing retainer for a bag according to claim 1, having two gripping portions that releasably grip the bottom corners. **Claim 3** The self-standing retainer for a bag according to claim 2, wherein the gripping portion clamps the bottom corners. **Claim 4** The self-standing retainer for a bag according to claim 3, wherein the clamping is by pushing, screwing, elastic force, or magnetic attraction. **Claim 5** The self-standing retainer for a bag according to claim 2, wherein the gripping portion hooks the bottom corners. **Claim 6** The self-standing retainer for a bag according to claim 5, wherein the hooking is by a slit. **Claim 7** The self-standing retainer for a bag according to any one of claims 1 to 6, comprising one or two parts formed using a polymer material or metal.

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