Traditional Chinese medicine soaking and washing barrel

Abstract

The invention discloses a traditional Chinese medicine soaking and washing barrel, and relates to the technical field of foot soaking barrels, the traditional Chinese medicine soaking and washing barrel comprises a barrel body, and a soaking pool for containing feet is arranged in the barrel body; the tray is detachably arranged in the soaking pool, a containing space is concavely formed in the side wall, facing the bottom wall of the soaking pool, of the tray, the tray is located on the inner bottom wall of the soaking pool, the inner bottom wall of the soaking pool seals an opening in the bottom end of the containing space, and the containing space is used for containing traditional Chinese medicinal materials; a plurality of overflow holes are formed in the side wall of the tray and are communicated with the accommodating space and the soaking pool; when the soaking pool is filled with hot water, the top wall in the containing space, the peripheral side walls and the bottom wall of the soaking pool prevent traditional Chinese medicine from overflowing into the soaking pool and floating on the liquid surface. The tray is placed in the soaking pool, the top wall in the containing space, the peripheral side walls and the bottom wall of the soaking pool prevent traditional Chinese medicine from overflowing into the soaking pool and floating on the liquid level, the traditional Chinese medicine enters the containing space through the overflow holes to be soaked, the traditional Chinese medicine is dispersed in the containing space, drug effect release is not affected, and the effect is good. Meanwhile, the traditional Chinese medicinal materials are prevented from floating on the liquid level due to light weight.

Description

Technical Field

[0001] The invention relates to the technical field of foot soaking buckets, in particular to a Chinese medicine foot soaking bucket. Background Art

[0002] A healthy lifestyle is a lifelong pursuit. In pursuit of this, more and more people are learning and practicing health preservation, and foot soaking is one of the most convenient and effective methods. A traditional Chinese medicine foot soak, as the name suggests, incorporates traditional Chinese medicine ingredients into the tub. Through hot water immersion and the pharmacological effects of traditional Chinese medicine, it achieves health and wellness. Soaking the feet in hot water dilates blood vessels, promoting blood circulation. Simultaneously, the herbal ingredients penetrate the skin and are absorbed by the body, achieving benefits such as conditioning, relieving fatigue, and improving sleep.

[0003] There are a wide variety of foot soaking tubs available on the market. Most simply place the Chinese medicinal herbs directly into the tub. When the feet are removed from the tub for wiping, the hot water can leave residue on the feet and calves. When wiping, the residue can also be left on the foot cloth. Some users encapsulate the herbs in small, mesh bags and place them in the tub for soaking, allowing the herbs' medicinal properties to be released and blended with the hot water. However, encapsulating the herbs in small bags results in a slow release of their medicinal properties. Furthermore, because the herbs are light, they tend to float on the surface of the liquid, hindering their rapid release. Summary of the Invention

[0004] The purpose of the present invention is to provide a Chinese medicine soaking and washing bucket to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a Chinese medicine soaking and washing barrel, comprising a barrel body, wherein the barrel body has a built-in soaking pool for accommodating feet, and the soaking pool is used to fill hot water for soaking feet.

[0006] A tray, wherein the circumferential dimension of the tray is smaller than the inner circumferential dimension of the bubble pool, the tray is detachably arranged in the bubble pool, a receiving space is recessed on the side wall of the tray facing the bottom wall of the bubble pool, the tray is seated on the inner bottom wall of the bubble pool, and the inner bottom wall of the bubble pool closes the bottom end opening of the receiving space, and the receiving space is used to receive Chinese medicinal materials; A plurality of overflow holes are provided on the side wall of the tray, and the overflow holes connect the accommodating space and the bubble pool. After hot water is poured into the bubble pool, it will flow into the accommodating space through the plurality of overflow holes. At the same time, the hot water in the accommodating space can also flow into the accommodating space through the overflow holes, thereby realizing mutual communication between the two spaces, facilitating the mutual flow and fusion of the hot water in the two spaces, so that the hot water enters the accommodating space to soak the Chinese medicinal materials. After being soaked in the hot water, the Chinese medicinal materials release their medicinal properties, are diffused in the hot water, and enter the bubble pool from the accommodating space through the overflow holes, thereby achieving the purpose of expanding the release of the efficacy of the Chinese medicine.

[0007] When the bubble pool is filled with hot water, the top wall, surrounding side walls and bottom wall of the accommodating space prevent the Chinese medicine from overflowing into the bubble pool and floating on the liquid surface, thereby preventing the Chinese medicine and its residue from adhering to the surface of the foot or calf, which requires wiping with a foot cloth or rinsing again with clean water.

[0008] In a further embodiment, the plurality of overflow holes are equally distributed in a plurality of columns, each column is provided with a plurality of overflow ports, and the inner diameter of the overflow ports is 2-5 mm.

[0009] In a further embodiment, a partition is further included, which is detachably arranged at the bottom opening of the accommodating space. The partition is used to close the bottom opening of the accommodating space to form a closed chamber for filling the Chinese medicine before soaking.

[0010] In a further embodiment, enclosure 1 and enclosure 2 extend from the side wall of the partition facing the top wall of the accommodating space, and enclosure 1 and enclosure 2 are distributed along the circumference of the partition. The side wall of one side of the enclosure is flush with the side of the partition, and enclosure 2 is located on the inner side of enclosure 1, and a placement gap is left between enclosure 2 and enclosure 1, and the height of enclosure 2 is higher than that of enclosure 1.

[0011] In a further embodiment, when the partition is arranged at the bottom opening of the accommodating space, one side wall of the enclosure is in contact with the inner circumferential side wall of the accommodating space, and the second top wall of the enclosure is in contact with the inner top wall of the accommodating space.

[0012] In a further embodiment, a plurality of connecting pieces are connected between the enclosure 1 and the enclosure 2, and a plurality of independent gaps are formed in the placement gap.

[0013] In a further embodiment, a bearing surface is recessed on the side wall of the tray facing away from the bottom wall of the bubble pool; The two opposite side walls in the bearing surface are both provided with holding holes that pass through the side walls of the tray.

[0014] In a further embodiment, two sole placement areas are provided on the supporting surface, and the sole placement areas are recessed downwards to form a plurality of rotation grooves, wherein massage heads are rotatably provided in the rotation grooves.

[0015] In a further embodiment, the massage head has two cylindrical heads, and a plurality of protrusions are fixed on the radial side walls of the cylindrical heads. An elastic connecting strip is connected between the two cylindrical heads. The ends of the two cylindrical heads that are away from each other are spherical structures and are fixedly connected with a spherical clip joint. Spherical rotation grooves are provided at both ends of the rotation groove, and the spherical clip joint is rotatably embedded in the spherical rotation groove.

[0016] In a further embodiment, an enlarged end is provided at one end of the two cylindrical heads close to each other, and a plurality of protrusions 2 are provided at the edges of the two enlarged ends opposite to the side walls.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a Chinese medicine soaking and washing bucket. It is unnecessary to package the soaked Chinese medicinal materials in small bags. The Chinese medicinal materials can be directly placed in the accommodating space. At the same time, a tray is placed in the soaking pool. The top wall, the surrounding side walls and the bottom wall of the soaking pool in the accommodating space prevent the Chinese medicinal materials from overflowing into the soaking pool and floating on the liquid surface. Hot water is poured into the soaking pool, and the Chinese medicinal materials enter the accommodating space through the overflow hole to be soaked. The medicinal effects of the Chinese medicinal materials are released and merged with the hot water during the hot water soaking process. The Chinese medicinal materials are dispersed in the accommodating space, which does not affect the release of the medicinal effects and can prevent the Chinese medicinal materials from being light and floating on the liquid surface, which is not conducive to the release of the medicinal properties and also adheres to the calves or the soles of the feet, making it inconvenient to wipe the feet after soaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 For the present invention Figure 1 A magnified view of the structure at center A; Figure 3 For the present invention Figure 1 A magnified view of the structure at point B in the middle; Figure 4 This is a schematic structural diagram of a single massage head of the present invention; Figure 5 This is a schematic diagram of the massage head of the present invention being deformed when pressed; Figure 6 This is a front view of the massage head structure of the present invention; Figure 7 This is a schematic diagram of the tray structure of the present invention; Figure 8 For the present invention Figure 7 A magnified view of the structure at point C in the middle; Figure 9 This is a schematic diagram of the back structure of the tray of the present invention; Figure 10 This is a disassembled diagram of the back structure of the tray and partition of the present invention; Figure 11 This is a schematic diagram of the front placement structure of the partition of the present invention.

[0019] In the figure: 1. barrel body; 2. tray; 21. bearing surface; 22. holding hole; 23. overflow hole; 24. rotation groove; 25. accommodating space; 26. partition; 261. enclosure 1; 262. enclosure 2; 263. connecting piece; 3. cylindrical head; 31. protrusion 1; 32. expanded end; 33. spherical card joint; 34. protrusion 2; 35. elastic connecting strip. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0021] Embodiment, this embodiment provides a Chinese medicine soaking and washing bucket, such as Figure 1 As shown, it includes a barrel body 1, which has a built-in soaking pool for accommodating feet; at the same time, the soaking pool is used to fill hot water for soaking feet.

[0022] Also disclosed is a tray 2, such as Figure 1 and Figure 9 As shown, tray 2 circumferential dimension is smaller than the inner circumferential dimension of the bubble pool, and tray 2 is detachably arranged in the bubble pool. Since tray 2 size is smaller than the inner circumferential dimension of the bubble pool, such purpose is to facilitate tray 2 to be easily placed in the bubble pool, not blocked by the inner side wall of the bubble pool, and is located on the inner bottom wall of the bubble pool. Tray 2 is recessed with accommodation space 25 on the sidewall facing the bubble pool bottom wall. When tray 2 is located on the inner bottom wall of the bubble pool, the inner bottom wall of the bubble pool closes the bottom openings of accommodation space 25. So before the bubble pool is poured with hot water, Chinese medicinal materials to be soaked can be scattered on the inner bottom wall of the bubble pool, and then tray 2 is vertically placed in the bubble pool, and falls on the inner bottom wall of the bubble pool. At this moment, accommodation space 25 is closed by the inner bottom wall of the bubble pool, and accommodation space 25 is used to accommodate Chinese medicinal materials. Subsequently, hot water is poured into the bubble pool, and the top wall, the surrounding side walls and the bottom wall of the bubble pool prevent Chinese medicine from overflowing into the bubble pool and floating on the liquid surface.

[0023] At the same time, a plurality of overflow holes 23 are provided on the side wall of the tray 2, such as Figure 2As shown, the overflow hole 23 can connect the two spaces of the receiving space 25 and the bubble pool; that is, after hot water is poured into the bubble pool, it will flow into the receiving space 25 through the multiple overflow holes 23. At the same time, the hot water in the receiving space 25 can also flow into the receiving space 25 through the overflow holes 23, realizing that the two spaces are interconnected. In this way, it is convenient for the hot water in the two spaces to flow and merge with each other, so that the hot water enters the receiving space 25 to soak the Chinese medicinal materials. After being soaked in hot water, the Chinese medicinal materials release their medicinal properties, are diffused in the hot water, and enter the bubble pool from the receiving space 25 through the overflow holes 23, thereby achieving the purpose of expanding the release of the Chinese medicinal effects. A bearing surface 21 is recessed on the side wall of the tray 2 facing away from the bottom wall of the bubble pool. After waiting for the water temperature to be suitable, put your feet into the bubble pool and let them fall on the bearing surface 21 for soaking in hot water. The Chinese medicinal ingredients penetrate through the skin and are absorbed by the body, achieving the purpose of conditioning the body. Handle holes 22 are provided on opposite sides of the support surface 21, extending through the sidewalls of the tray 2. After soaking your feet, dry them with a towel and keep them warm. Then, place your hands into the handles 22 to lift the tray 2 from the bathing pool and tilt the barrel 1 to empty the herbal rub. Note: The foot soaking time should not be too long, generally within 20-30 minutes. The water temperature should not be too high to avoid burns.

[0024] It needs to be further explained that, Figure 2 As shown, the multiple overflow holes 23 are equally distributed in multiple columns, each column is provided with multiple overflow ports, and the inner diameter of each overflow port is 2-5 mm. The inner diameter of the overflow hole 23 is preferably 2 mm. The purpose is to allow the hot water in the two spaces of the receiving space 25 and the soaking pool to flow and merge with each other, ensuring that the medicinal effects are diffused and released in the hot water, and to minimize the entry of Chinese medicinal materials in the receiving space 25 into the soaking pool through the overflow hole 23, thereby preventing the Chinese medicinal materials and their residues from adhering to the surface of the foot or calf, which requires wiping with a foot cloth or rinsing with clean water, which is relatively inconvenient.

[0025] When the bottom opening of the accommodating space 25 is sealed by the inner bottom wall of the bubble pool, it is necessary to place the Chinese medicinal materials on the inner bottom wall of the bubble pool before pouring hot water, and then place the tray 2 on the inner bottom wall of the bubble pool. A closed frame is formed above the inner bottom wall of the bubble pool to wrap around the outside of the Chinese medicinal materials, which can prevent the Chinese medicinal materials from floating on the liquid surface. Of course, in addition to placing the tray 2 on the inner bottom wall of the bubble pool and sealing the bottom opening of the accommodating space 25 by the inner bottom wall of the bubble pool, the above technical solution can be further optimized.

[0026] like Figure 10As shown, this embodiment also includes a partition 26, which is detachably arranged at the bottom opening of the storage space 25. The partition 26 is used to close the bottom opening of the storage space 25 to form a closed chamber for filling the Chinese medicinal materials before soaking. In other words, by using the partition 26 to close the bottom opening of the storage space 25, on the one hand, when placing the Chinese medicinal materials, the tray 2 can be turned over, the opening of the storage space 25 is facing upward, the Chinese medicinal materials are placed in the storage space 25, and then the partition 26 is covered on the opening of the storage space 25. Here, the partition 26 can be installed by snap-fitting or other methods that can be easily installed and removed. In this way, the Chinese medicinal materials will be placed in a relatively closed space. Finally, the tray 2 is turned over, and the partition 26 is placed in the soaking pool facing the bottom wall of the soaking pool. With this design, there is no need to consider whether to pour hot water into the soaking pool before or after the Chinese medicinal materials are placed.

[0027] On the other hand, when the foot bath is finished, the entire barrel body 1 can be tilted or opened downward to pour out the hot water after the foot bath, and the tray 2 can be poured out at the same time. No Chinese medicinal materials and residues will remain in the barrel body 1, and it only needs to be rinsed with clean water. After the tray 2 is connected to the partition 26 and poured out, the partition 26 is removed, and the receiving space 25 of the tray 2 is opened. The tray 2 can be gently knocked downward with the help of the ground or other hard objects to quickly shake out the Chinese medicinal materials and residues in the receiving space 25, and then rinsed with clean water.

[0028] Another method of placing Chinese medicinal materials in the accommodating space 25 can also be adopted, such as Figure 11 As shown, a first enclosure 261 and a second enclosure 262 extend from the side wall of the partition 26 facing the inner top wall of the accommodation space 25. The first enclosure 261 and the second enclosure 262 are distributed along the circumference of the partition 26. The side wall of the first enclosure 261 is flush with the side of the partition 26. The second enclosure 262 is located inside the first enclosure 261, and a gap is left between the second enclosure 262 and the first enclosure 261. Figure 11 As can be clearly seen from the illustrated structure, the height of the second enclosure 262 is higher than that of the first enclosure 261. This means that when the partition 26 is positioned at the bottom opening of the storage space 25, the side walls of the first enclosure 261 abut against the inner circumferential side walls of the storage space 25, and the top wall of the second enclosure 262 contacts the inner top wall of the storage space 25. Therefore, when placing Chinese medicinal materials, there is no need to orient the storage space 25 of the tray 2 upward. Instead, the Chinese medicinal materials can be directly sprinkled into the placement gap formed by the first enclosure 261 and the second enclosure 262. The partition 26 is then positioned directly into the bottom opening of the storage space 25, which opens downward, to place the Chinese medicinal materials into the storage space.

[0029] The difference from the previous placement of Chinese medicinal materials is that Figure 11As shown in the figure, the placement gap covers a much smaller area than the entire partition 26, allowing the Chinese medicinal materials to be placed closer to the edge of the partition 26, that is, closer to the overflow hole 23 of the tray 2. Then, when hot water enters the placement gap, it can soak the Chinese medicinal materials. The medicinal effects released by the soaked Chinese medicinal materials can be diffused from the overflow hole 23 to the hot water in the bath in the most direct and rapid way. This greatly improves the efficiency of medicinal effect diffusion.

[0030] In order to evenly distribute the Chinese medicinal materials throughout the placement gap, multiple connecting pieces 263 are connected between the first and second panels 261, 262, forming multiple independent gaps within the placement gap. When placing the Chinese medicinal materials, they are evenly spread between two adjacent connecting pieces 263. Once the partition 26 is inserted into the bottom opening of the accommodating space 25, the Chinese medicinal materials are unlikely to flow widely within the placement gap. In this way, when the Chinese medicinal materials are soaked in hot water, they will flow and diffuse through the multiple overflow holes 23 on the circumferential side walls of the tray 2, maximizing the diffusion range and facilitating the rapid penetration of the Chinese medicinal ingredients through the skin and absorption by the body.

[0031] During the foot soaking process, the soles of the feet will be rubbed back and forth, which will inevitably cause the hot water to form small fluctuations in the bathing pool. The fluctuating hot water will drive the Chinese medicinal materials in the placement gap to flow with the waves. Therefore, by providing multiple connecting pieces 263, it is possible to avoid the Chinese medicinal materials from having a large amount of local accumulation and a small amount of local accumulation in the placement gap, resulting in the phenomenon of faster local diffusion and slower local diffusion when the medicinal effect spreads.

[0032] During the foot soaking process, most users will also need to massage the soles of their feet. For this reason, in this embodiment, two sole placement areas are provided on the bearing surface 21. The sole placement areas are recessed downwards and have multiple rotation grooves 24. Massage heads are rotated in the rotation grooves 24. Figure 1 、 Figure 3 、 Figure 4 and Figure 6 As shown, specifically, the massage head has two cylindrical heads 3, and a plurality of protrusions 31 are fixed on the radial side wall of the cylindrical head 3. An elastic connecting strip 35 is connected between the two cylindrical heads 3. The ends of the two cylindrical heads 3 that are away from each other are spherical structures and are fixedly connected with a spherical clamping joint 33. Both ends of the rotating groove 24 are provided with a spherical rotating groove 24. The spherical clamping joint 33 is rotatably embedded in the spherical rotating groove 24. Figure 7 and Figure 8 The elastic connection adjustment 35 is used to connect the two cylindrical heads 3. Here, the spherical joints 33 at the ends of the two cylindrical heads 3 are rotatably embedded in the corresponding spherical rotation grooves 24. When the user soaks their feet, the soles of their feet step on the multiple cylindrical heads 3 and rub them back and forth within the plane where the soles of the feet are placed. While rubbing, the soles of the feet slightly push down, and the raised points 31 on the outer walls of the cylindrical heads 33 can massage the acupuncture points on the soles of the feet.

[0033] The key point of the above structural design is that the elastic connecting strip 35 can be made of PVC plastic, which has the special effect of reversible deformation. At the same time, an enlarged end 32 is provided at the end where the two columnar heads 3 are close to each other, and multiple protrusions 34 are provided at the edges of the side walls opposite the two enlarged ends 32. When the soles of the feet step on the multiple columnar heads 3 and rub them back and forth within the plane where the soles of the feet are placed, while rubbing the soles of the feet slightly downward, in addition to the protrusions 31 being able to massage the acupuncture points on the soles of the feet, the elastic connecting strip 35 will bend downward under the pressure of the soles of the feet, as shown in the figure. Figure 5 In the deformation process shown, the enlarged end 32 is made of soft silicone, while the second protrusion 34 is made of a hard material, such as PVC plastic. The two enlarged ends 32 of the same massage head will bend due to the elastic connecting strip 35, so that the contact areas with the sole of the foot are brought closer to each other. In this way, the two second protrusions 34 in relative positions can squeeze into the skin of the sole of the foot from the two enlarged ends 32 to achieve a double massage effect.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A Chinese medicine soaking and washing bucket, characterized in that: include: A barrel body (1), wherein the barrel body (1) has a built-in soaking pool for accommodating two feet; A tray (2), wherein the circumferential dimension of the tray (2) is smaller than the inner circumferential dimension of the bubble pool, the tray (2) is detachably arranged in the bubble pool, a receiving space (25) is recessed on the side wall of the tray (2) facing the bottom wall of the bubble pool, the tray (2) is seated on the inner bottom wall of the bubble pool, and the inner bottom wall of the bubble pool closes the bottom end opening of the receiving space (25), and the receiving space (25) is used to receive Chinese medicinal materials; A plurality of overflow holes (23) are provided on the side wall of the tray (2), and the overflow holes (23) are connected to the accommodating space (25) and the bubble pool; When the bubble pool is filled with hot water, the top wall, the surrounding side walls and the bottom wall of the accommodating space (25) prevent the Chinese medicine from overflowing into the bubble pool and floating on the liquid surface.

2. The Chinese medicine soaking and washing bucket according to claim 1, characterized in that: The plurality of overflow holes (23) are equally distributed in a plurality of columns, and each column is provided with a plurality of overflow ports, wherein the inner diameter of the overflow ports is 2-5 mm.

3. The Chinese medicine soaking and washing bucket according to claim 1, characterized in that: It also includes a partition (26), which is detachably arranged at the bottom opening of the accommodating space (25). The partition (26) is used to close the bottom opening of the accommodating space (25) to form a closed chamber for filling the Chinese medicine before soaking.

4. The Chinese medicine soaking and washing bucket according to claim 3, characterized in that: A first enclosure (261) and a second enclosure (262) are extended from the side wall of the partition (26) facing the inner top wall of the accommodating space (25). The first enclosure (261) and the second enclosure (262) are distributed along the circumference of the partition (26). The side wall of the first enclosure (261) is flush with the side of the partition (26). The second enclosure (262) is located on the inner side of the first enclosure (261), and a placement gap is left between the second enclosure (262) and the first enclosure (261). The height of the second enclosure (262) is higher than the height of the first enclosure (261).

5. The Chinese medicine soaking and washing bucket according to claim 4, characterized in that: When the partition (26) is arranged at the bottom opening of the accommodating space (25), the side wall of the first enclosure (261) fits the inner circumferential side wall of the accommodating space (25), and the top wall of the second enclosure (262) contacts the inner top wall of the accommodating space (25).

6. The Chinese medicine soaking and washing bucket according to claim 4, characterized in that: A plurality of connecting pieces (263) are connected between the first enclosure (261) and the second enclosure (262), and a plurality of independent gaps are formed in the placement gap.

7. The Chinese medicine soaking and washing bucket according to claim 1, characterized in that: The tray (2) has a bearing surface (21) recessed on the side wall facing away from the bottom wall of the bubble pool; The two opposite side walls of the bearing surface (21) are each provided with a holding hole (22) that passes through the side wall of the tray (2).

8. The Chinese medicine soaking and washing bucket according to claim 7, characterized in that: Two foot placement areas are provided on the bearing surface (21), and the foot placement areas are recessed downward to form a plurality of rotation grooves (24), wherein massage heads are rotatably provided in the rotation grooves (24).

9. The Chinese medicine soaking and washing bucket according to claim 8, characterized in that: The massage head has two cylindrical heads (3), and a plurality of protrusions (31) are fixed on the radial side walls of the cylindrical heads (3). An elastic connecting strip (35) is connected between the two cylindrical heads (3). One end of the two cylindrical heads (3) that is away from each other is a spherical structure and is fixedly connected with a spherical clamping joint (33). Both ends of the rotating groove (24) are provided with a spherical rotating groove (24), and the spherical clamping joint (33) is rotatably embedded in the spherical rotating groove (24).

10. The Chinese medicine soaking and washing bucket according to claim 9, characterized in that: An enlarged end (32) is provided at one end of the two columnar heads (3) that is close to each other, and a plurality of protrusions (34) are provided at the edge positions of the side walls opposite to the two enlarged ends (32).

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