US20180317625A1

US20180317625A1 - Compact container for preventing remnants by rotating content container

Info

Publication number: US20180317625A1
Application number: US15/769,307
Authority: US
Inventors: Do Hoon LEE
Original assignee: Pum Tech Korea Co Ltd
Current assignee: Pum Tech Korea Co Ltd
Priority date: 2015-11-02
Filing date: 2016-10-20
Publication date: 2018-11-08
Also published as: WO2017078303A1; JP6641475B2; CN108135345A; KR101791682B1; JP2018531722A; EP3372109A1; KR20170051830A; EP3372109A4

Abstract

The present invention relates to a compact container for preventing remnants by rotating a content container, configured such that a support is hinge-coupled inside a main container body; a rotating frame is rotatably coupled to the inner side of the support; the content container is fixed and coupled to the inner side of the rotating frame; and an impregnated member impregnated with a cosmetic is provided inside the content container, wherein mutual coupling is achieved by forming a rotary shaft on the inner circumferential surface of the support and forming a rotary groove in the outer circumferential surface of the rotating frame, thereby allowing the support to be lifted up from the main container body, then the content container to be overturned by rotating the rotating frame from the support, and then the support to be coupled back to the main container body and used.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean application No. 10-2015-0153196, filed on Nov. 2, 2015 with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a compact container for preventing remnants by rotating a content container, and more specifically, to a compact container for preventing remnants by rotating a content container, in which a support is hinge-coupled to an inside of a main container body; a rotating frame is rotatably coupled to an inner side of the support; the content container is fixedly coupled to an inner side of the rotating frame; and an impregnated member impregnated with a cosmetic material is provided inside the content container, wherein a rotary shaft is formed at an inner periphery of the support, and a rotary groove is formed in an outer periphery of the rotating frame, so that the support is coupled with the rotating frame. Accordingly, when an upper surface of the impregnated member becomes dry and hardened while the impregnated member is used, the support is lifted upward from the main container body, the content container is overturned by rotating the rotating frame from the support, and the support is coupled back to the main container body for use.
In addition, the present invention relates to a compact container for preventing remnants by rotating a content container, in which the support is hinge-coupled to an inner front side of the main container body, and a support handle is formed on an opposite side of the hinge-coupling portion of the support, so that when a container lid or the support is rotated, the container lid and the support are prevented from interfering with each other, and a user may easily lift the support upward from the main container body by grabbing the support handle, thereby facilitating the use of the compact container.

BACKGROUND ART

Unlike basic cosmetic products for supplying nutrients to the skin, color cosmetics include pigments to adjust the tone of the skin, thereby enhancing the aesthetic.
The color cosmetics are classified into a base makeup used for making a skin color uniform and covering defects, and a point makeup used for partially enhancing a three-dimensional effect of lips, eyes, or nails. In general, the base makeup includes a makeup base, a foundation, and a powder, and the point makeup includes a lipstick, an eye liner, and mascara.
The foundation is classified into a solid foundation, a liquid foundation and a gel foundation according to the form of the cosmetic material. Although the solid foundation produces an effect of excellently covering the skin, the solid foundation may be conglomerated when correcting the makeup. In addition, although the liquid foundation provides a good close contact feel, the persistency of the liquid foundation is weak. Accordingly, many consumers recently prefer the gel foundation which has a considerable persistency and gives a good close contact feel when applied onto the skin.
In general, the gel foundation is filled in a glass container or a tube container, and used in such a manner that users take or squeeze some of the gel foundation on their hands for use, and apply the gel foundation onto the skin using a puff or the hands.
However, according to the related art, there is an inconvenience in that the user is required to wash the cosmetic material put on their hands whenever using the cosmetic material, and the cosmetic material is wasted as the cosmetic material put on the hands is washed off as described above.
To solve the problems described above, as shown in FIG. 1, Korean Patent Registration No. 10-1257628 has been disclosed. The related art discloses a compact container, in which foamed urethane foam is accommodated inside a compact case, and a gel foundation is impregnated in the foamed urethane foam.
The gel foundation impregnated in the foamed urethane foam is taken and applied onto the skin when the compact container of the related art is used. When the gel foundation impregnated in the foamed urethane foam is used, although the gel foundation impregnated in a lower portion of the foamed urethane foam still remains, a surface of the foamed urethane foam becomes dry and hardened in the end as the gel foundation in an upper portion of the foamed urethane foam is reduced, so that gel foundation contents cannot be taken and applied.
Accordingly, the users have to pull out the foamed urethane foam having the hardened surface from the compact case, and turn over the foamed urethane foam, and then put back the foamed urethane foam into the compact case to use the gel foundation remaining in the lower portion of the foamed urethane foam.
To solve the problems described above, as shown in FIG. 2, the applicant of the present invention has filed Korean Patent Registration No. 20-0476245 disclosing a cosmetic compact case.
According to the related art, a case body 1 and a lid 2 are coupled to each other by a hinge h, and the cosmetic content acceptor 3 is coupled to the hinge h, and the cosmetic content acceptor 3 includes a frame 4 and a rotating unit 5 coupled to be rotatable at an inner side of the frame 4, wherein first and second lids 6 and 7 are hinge-coupled to upper and lower portions of the rotating unit 5, and a foamed urethane foam impregnated with a gel foundation is accommodated in the rotating unit 5.
According to the related art, after the rotating unit 5 is rotated and mounted on the cosmetic content acceptor 3 such that the gel foundation remaining in a lower portion of the foamed urethane foam is located at an upper portion of the foamed urethane foam, the gel foundation remaining in the foamed urethane foam is used.
However, according to the related art, the cosmetic content acceptor 3 is coupled to the case body 1 and the lid 2 by the hinge h, so that the rotation of the lid 2 and the cosmetic content acceptor 3 may interfere with each other, for example, the cosmetic content acceptor 3 may be rotated and lifted together with the lid 2 when the user rotates and opens the lid 2, or the lid 2 may be further bent backward when the cosmetic content acceptor 3 is lifted.
In addition, according to the related art, handles protrude from one side of the first and second lids 6 and 7 coupled to the upper and lower portions of the rotating unit 5, so that an empty space is formed between the case body 1 and the rotating unit 5, and thus it is inefficient in utilizing an inner space of the case body 1.

DISCLOSURE

Technical Problem

To solve the problems described above, an object of the present invention is to provide a compact container for preventing remnants by rotating a content container, in which a support is hinge-coupled to an inside of a main container body; a rotating frame is rotatably coupled to an inner side of the support; the content container is fixedly coupled to an inner side of the rotating frame; and an impregnated member impregnated with a cosmetic material is provided inside the content container, wherein a rotary shaft is formed at an inner periphery of the support, and a rotary groove is formed in an outer periphery of the rotating frame, so that the support is coupled with the rotating frame. Accordingly, when an upper surface of the impregnated member becomes dry and hardened while the impregnated member is used, the support is lifted upward from the main container body, the content container is overturned by rotating the rotating frame from the support, and the support is coupled back to the main container body for use.
In addition, an object of the present invention is to provide a compact container for preventing remnants by rotating a content container, in which the support is hinge-coupled to an inner front side of the main container body, and a support handle is formed on an opposite side of the hinge-coupling portion of the support, so that when a container lid or the support is rotated, the container lid and the support are prevented from interfering with each other, and a user may easily lift the support upward from the main container body by grabbing the support handle, thereby facilitating the use of the compact container.
In addition, an object of the present invention is to provide a compact container for preventing remnants by rotating a content container, in which a first content lid and a second content lid are coupled to upper and lower portions of the rotating frame, a handle is formed on one side of the first and second content lids, and a handle insertion hole is formed on a bottom surface of the main container body such that the handles of the first and second content lids are inserted into the handle insertion hole, so that an empty space is prevented from being formed between the main container body and the first and second content lids, thereby enabling a space inside the main container body to be efficiently used.

Technical Solution

According to the present invention, there is provided a compact container for preventing remnants by rotating a content container, in which the compact container includes a main container body (10) and a container lid (20) hinge-coupled to one side of the main container body (10) so as to be opened and closed, the compact container including:
a support (30) hinge-coupled to an inside of the main container body (10) and formed at an inner periphery thereof with a rotary shaft (34);
a rotating frame (40) rotatably coupled to an inner side of the support (30) and formed at an outer periphery thereof with a rotary groove (44);
a content container (50) fixedly coupled to an inner side of the rotating frame (40); and
an impregnated member (60) accommodated in the content container (50) and impregnated with a cosmetic material,
wherein one side of an outer periphery of the support (30) is hinge-coupled to an inner front side of the main container body (10), and an opposite side of the outer periphery of the support (30) is formed with a support handle (32) for lifting the support (30) upward from a rear side of the main container body (10).
In addition, a hinge coupling protrusion (16) may be formed on the inner front side of the main container body (10), and a hinge coupling groove (36) may be formed on one side of the support (30), so that the main container body (10) may be coupled with the support (30).
In addition, a first content lid (41) and a second content lid (42) may be coupled to an upper portion and a lower portion of the rotating frame (40), respectively.
In addition, a first handle (412) and a second handle (422) may be formed on one side of the first and second content lids (41 and 42), respectively, and a handle insertion hole (12), into which the first handle (412) or the second handle (422) is inserted, may be formed on one side of a bottom surface of the main container body (10).
In addition, the outer periphery of the rotating frame (40) may be curved in a shape of “( )” where a central portion has an outer diameter larger than an outer diameter of upper and lower ends.
In addition, a fixing member (70) for preventing the impregnated member (60) accommodated in the content container (50) from being separated to an outside may be formed at an upper portion of the content container (50).

Advantageous Effects

In the compact container for preventing the remnants by rotating the content container according to the present invention, a support is hinge-coupled to an inside of a main container body; a rotating frame is rotatably coupled to an inner side of the support; the content container is fixedly coupled to an inner side of the rotating frame; and an impregnated member impregnated with a cosmetic material is provided inside the content container, wherein a rotary shaft is formed at an inner periphery of the support, and a rotary groove is formed in an outer periphery of the rotating frame, so that the support is coupled with the rotating frame. Accordingly, when an upper surface of the impregnated member becomes dry and hardened while the impregnated member is used, the support is lifted upward from the main container body, the content container is overturned by rotating the rotating frame from the support, and the support is coupled back to the main container body for use.
In addition, the support is hinge-coupled to an inner front side of the main container body, and a support handle is formed on an opposite side of the hinge-coupling portion of the support, so that when a container lid or the support is rotated, the container lid and the support are prevented from interfering with each other, and a user can easily lift the support upward from the main container body by grabbing the support handle, thereby facilitating the use of the compact container.
In addition, a first content lid and a second content lid are coupled to upper and lower portions of the rotating frame, a handle is formed on one side of the first and second content lids, and & handle insertion hole is formed on a bottom surface of the main container body such that the handles of the first and second content lids are inserted into the handle insertion hole, so that an empty space is prevented from being formed between the main container body and the first and second content lids, thereby enabling a space inside the main container body to be efficiently used.

DESCRIPTION OF DRAWINGS

FIG. 1 shows a cosmetic product including foamed urethane foam impregnated with a cosmetic composition according to the related art.

FIG. 2 shows a cosmetic compact case.

FIG. 3 is a perspective view showing a compact container for preventing remnants by rotating a content container according to the present invention.

FIG. 4 is an exploded perspective view showing the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 5 is a sectional view taken along the line A-A showing the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 6 is a sectional view taken along the line B-B showing the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 7 is a perspective view showing a state of lifting a support of the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 8 is a sectional view taken along the line C-C showing a state of lifting the support of the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 9 is a perspective view showing a state of rotating a rotating frame of the compact container for preventing the remnants by rotating the content container according to the present invention.

FIG. 10 is a Sectional view taken along the line D-D showing a state of rotating the rotating frame of the compact container for preventing the remnants by rotating the content container according to the present invention.

BEST MODE

Mode for Invention

Hereinafter, a compact container for preventing remnants by rotating a content container according to the present invention will be described with reference to accompanying drawings.
FIG. 3 is a perspective view showing a compact container for preventing remnants by rotating a content container according to the present invention, FIG. 4 is an exploded perspective view showing the compact container for preventing the remnants by rotating the content container according to the present invention, FIG. 5 is a sectional view taken along the line A-A showing the compact container for preventing the remnants by rotating the content container according to the present invention, and FIG. 6 is a sectional view taken along the line B-B showing the compact container for preventing the remnants by rotating the content container according to the present invention.
According to the present invention, a compact container for preventing remnants by rotating a content container, in which the compact container includes a main container body 10 and a container lid 20 hinge-coupled to one side of the main container body 10 so as to be opened and closed, includes: a support 30 hinge-coupled to an inside of the main container body 10 and formed at an inner periphery thereof with a rotary shaft 34; a rotating frame 40 rotatably coupled to an inner side of the support 30 and formed at an outer periphery thereof with a rotary groove 44; a content container 50 fixedly coupled to an inner side of the rotating frame 40; and an impregnated member 60 accommodated in the content container 50 and impregnated with a cosmetic material.
wherein one side of an outer periphery of the support 30 is hinge-coupled to an inner front side of the main container body 10, and an opposite side of the outer periphery of the support 30 is formed with a support handle 32 for lifting the support 30 upward from a rear side of the main container body 10.
The support 30 is mounted at an inner center of the main container body 10, and a pair of support seating grooves 13 is formed at an inner side of the main container body 10.
A button 14 is formed on a front surface of the main container body 10, and a latching protrusion 15 which is easily withdrawn by a pushing operation of a user is integrally formed at a top of the button 14.
A hinge coupling protrusion 16 is formed on the inner front side of the main container body 10, that, is, on a rear side of the button 14, and hinge-coupled with the support 30.
A handle insertion hole 12 into which a first handle 412 or a second handle 422 is inserted is formed on one side of a bottom surface of the main container body 10.
The container lid 20 is hinge-coupled to the main container body 10 such that the container lid 20 is hinge-coupled to an opposite side of the hinge coupling protrusion 16 of the main container body 10 so as to open and close the main container body 10.
A protrusion-shaped hook 25 corresponding to the latching protrusion 15 of the main container body 10 is formed on one side of the container lid 20, and the hook 25 is fastened to the latching protrusion 15 of the main container body 10.
A mirror 22 is provided on the inner side of the container lid 20 so that the user may easily perform makeup.
The support 30 is mounted inside the main container body 10, and formed in a ring shape.
A hinge coupling groove 36 is formed on one side of the support 30 so as to be hinge-coupled to the hinge coupling protrusion 16 of the main container body 10.
A support handle 32 is formed on an opposite side of the hinge coupling groove 36 of the support 30 so that the user may easily grab and lift up the support 30.
In other words, in the compact container according to the present invention, the container lid 20 is hinge-coupled to one side of the main container body 10, and the support 30 is hinge-coupled to the opposite side, so that the container lid 20 and the support 30 does not interfere with each other when the container lid 20 or the support 30 is rotated and opened from the main container body 10.
A pair of rotary shafts 34 protrude from the inner periphery of the support 30, and the rotary shaft 34 supports the rotating frame 40 to rotate.
A rotational contact prevention groove 38 for preventing the first and second handles 412 and 422 of the first and second content lids 41 and 42 or a hinge part 43 from being interrupted upon the rotation of the rotating frame 40 is formed at an upper portion of the rotary shaft 34.
The rotating frame 40 is rotatably coupled to the inner side of the support 30.
A pair of rotary grooves 44 are formed at the outer periphery of the rotating frame 40 so that the rotary shaft 34 of the support 30 is inserted into the rotary groove 44.
A coupling protrusion wheel 46 to which the content container 50 is coupled protrudes from an inner periphery of the rotating frame 40.
The first content lid 41 and the second content lid 42, which tightly seal the upper and lower portions of the content container 50, are hinge-coupled to the upper and lower portions of the rotating frame 40.
The first handle 412 and the second handle 422 protrude from one side of the first and second content lids 41 and 42, and a first sealing protrusion wheel 404 and a second sealing protrusion wheel 424 extend downwards from lower portions of the first and second content lids 41 and 42, respectively.
The first handle 412 or the second handle 422 of the first and second content lids 41 and 42 is inserted into the handle insertion hole 12 of the main container body 10. Therefore, an empty space is prevented from being formed between the bottom surface of the main container body 10 and the first and second content lids 41 and 42, thereby enabling a space inside the main container body 10 to be efficiently used.
The first and second handles 412 and 422 of the first and second content lids 41 and 42 are curved on an upper surface thereof, so that when the rotating frame 40 is rotated at the inner side of the support 30, the first and second handles 412 and 422 can be easily rotated without being interrupted by both side surfaces of the rotational contact prevention groove 38 of the support 30.
The outer periphery of the rotating frame 40 is curved in a shape of “( )” where a central portion has an outer diameter larger than an outer diameter of upper and lower ends, such that the rotating frame 40 may be easily rotated at the inner side of the support 30.
The content container 50 is fixedly coupled to the inner side of the rotating frame 40, and the impregnated member 60 is mounted inside the content container 50.
The content container 50 has a cylindrical shape having an open upper portion and an open lower portion, and includes an inner wall 51, an outer wall 52 spaced outward from the inner wall 51 by a predetermined interval, and a connection part 53 for connecting the inner wall 51 to the outer wall 52.
A latching sill 54 extends inward from a lower end of the inner wall 51 of the content container 50, and the latching sill 54 prevents the impregnated member 60 accommodated in the content container 50 from being separated to the outside.
An upper coupling protrusion 55 and a lower coupling protrusion 56 are alternately formed on an outer periphery of the outer wall 52 of the content container 50, and the coupling protrusion wheel 46 of the rotating frame 40 is fitted between the upper coupling protrusion 55 and the lower coupling protrusion 56 so as to fix the content container 50.
In addition, a fixing member 70 for preventing the impregnation member 60 accommodated in the content container 50 from being separated to the outside is formed at an upper portion of the inner wall 51 of the content container 50.
The fixing member 70 includes a horizontal extension part 71 seated on an upper end of the inner wall 51, and a lower extension part 72 extending downward from the horizontal extension part 71 and coupled between the inner wall 51 and the outer wall 52.
The impregnated member 60 is accommodated in the content container 50, and impregnated with a cosmetic material of a gel foundation.
Hereinafter, a method of assembling the compact container for preventing the remnants by rotating the content container, which has a structure as described above, will be described.
In order to assemble the compact container for preventing the remnants by rotating the content container according to the present invention, first, as shown in FIGS. 4 to 6, the impregnated member 60 impregnated with a cosmetic material is inserted into the content container 50, and the fixing member 70 is coupled to the upper end of the inner wall 51 of the content container 50 to fix the impregnated member 60.
Thereafter, the content container 50 is coupled to the inner side of the rotating frame 40, such that the content container 50 is fixed by fitting the coupling protrusion wheel 46 of the rotating frame 40 between the upper coupling protrusion 55 and the lower coupling protrusion 56 of the content container 50.
Next, the first content lid 41 and the second content lid 42 are hinge-coupled to the upper and lower portions of the rotating frame 40.
Then, the rotating frame 40 is coupled to the inner side of the support 30, such that the rotary shaft 34 of the support 30 is fitted into the rotary groove 44 of the rotating frame 40.
Finally, the support 30 assembled as described above is hinge-coupled to the inside of the main container body 10 having one side hinge-coupled with the container lid 20, such that the hinge coupling protrusion 16 of the main container body 10 is hinge-coupled to the hinge coupling groove 36 of the support 30, and the second handle 422 of the second content lid 42 is inserted into the handle insertion hole 12 of the main container body 10, and thus the assembly of the compact container for preventing the remnants by rotating the content container according to the present invention is completed.
Hereinafter, the use of the compact container for preventing the remnants by rotating the content container, which is assembled as described above, will be described.
FIG. 7 is a perspective view showing a state of lifting a support of the compact container for preventing the remnants by rotating the content container according to the present invention, FIG. 8 is a sectional view taken along the line C-C showing a state of lifting the support of the compact container for preventing the remnants by rotating the content container according to the present invention, FIG. 9 is a perspective view showing a state of rotating a rotating frame of the compact container for preventing the remnants by rotating the content container according to the present invention, and FIG. 10 is a sectional view taken along the line D-D showing a state of rotating the rotating frame of the compact container for preventing the remnants by rotating the content container according to the present invention.
In order to use the compact container for preventing the remnants by rotating the content container according to the present invention, first, the container lid 20 is opened from the main container body 10 by pressing the button 14 formed on one side of the main container body 10.
Thereafter, the first handle 412 of the first content lid 41 formed at the upper portion of the content container 50 is grabbed and rotated to open the first content lid 41 from the content container 50, and the impregnated member 60 accommodated in the content container 50 is tapped with a makeup tool such as a puff to uniformly apply the cosmetic material to the skin.
After the makeup is completed, the first content lid 41 is rotated to close the content container 50, and the container lid 20 is rotated to close the main container body 10.
When the impregnated member 60 of the compact container for preventing the remnants by rotating the content container according to the present invention is used, if the surface of the impregnated member 60 is dried and hardened because the cosmetic material impregnated in the upper portion of the impregnated member 60 is completely consumed, the impregnated member 60 is overturned for use. First, as shown in FIGS. 7 and 8, the support handle 32 of the support 30 is grabbed, and the support 30 is lifted upward from a rear side of the main container body 10 to ensure a space for rotating the rotating frame 40.
At this time, the support 30 is hinge-coupled to the inner front side of the main container body 10, and the container lid 20 is hinge-coupled to the opposite side, so that the container lid 20 is not interrupted when the support 30 is rotated.
Thereafter, as shown in FIGS. 9 and 10, the rotating frame 40 Is rotated about the rotary shaft 34 of the support 30 to overturn the content container 50 in which the impregnated member 60 is accommodated.
At this time, the first and second content lids 41 and 42 and the hinge part 43 of the rotating frame 40 are rotated within the rotational contact prevention groove 38 of the support 30, so that the first and second content lids 41 and 42 and the hinge part 43 are not interrupted by the support 30.
Finally, the support 30 is lowered and seated inside the main container body 10 as shown in FIGS. 3 and 5, and thus the use of the compact container for preventing the remnants by rotating the content container according to the present invention is completed.
As described above, although the compact container for preventing the remnants by rotating the content container according to one embodiment of the present invention has been described for illustrative purposes, the present invention is not limited thereto. It is understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention as disclosed in the appended claims.


[Description of Reference Numerals]

	10: Main container body	12: Handle insertion hole
	16: Hinge coupling protrusion	20: Container lid
	30: Support	32: Support handle
	34: Rotary shaft	36: Hinge coupling protrusion
	40: Rotating frame	41: First content lid
	42: Second content lid	44: Rotary groove
	50: Content container	60: Impregnated member
	70: Fixing member	412: First handle
	422: Second handle

Claims

1. A compact container for preventing remnants by rotating a content container, in which the compact container includes a main container body (10) and a container lid (20) hinge-coupled 0to one side of the main container body (10) so as to be opened and closed, the compact container comprising:

a support (30) hinge-coupled to an inside of the main container body (10) and formed at an inner periphery thereof with a rotary shaft (34);

a rotating frame (40) rotatably coupled to an inner side of the support (30) and formed at an outer periphery thereof with a rotary groove (44);

a content container (50) fixedly coupled to an inner side of the rotating frame (40); and

an impregnated member (60) accommodated in the content container (50) and impregnated with a cosmetic material,

wherein one side of an outer periphery of the support (30) is hinge-coupled to an inner front side of the main container body (10), and an opposite side of the outer periphery of the support (30) is formed with a support handle (32) for lifting the support (30) upward from a rear side of the main container body (10).

2. The compact container of claim 1, wherein a hinge coupling protrusion (16) is formed on the inner front side of the main container body (10), and a hinge coupling groove (36) is formed on one side of the support (30), so that the main container body (10) is coupled with the support (30).

3. The compact container of claim 1, wherein a first content lid (41) and a second content lid (42) are coupled to an upper portion and a lower portion of the rotating frame (40), respectively.

4. The compact container of claim 3, wherein a first handle (412) and a second handle (422) are formed on one side of the first and second content lids (41 and 42), respectively, and a handle insertion hole (12) into which the first handle (412) or the second handle (422) is inserted, is formed on one side of a bottom surface of the main container body (10).

5. The compact container of claim 1, wherein the outer periphery of the rotating frame (40) is curved in a shape of “( )” where a central portion has an outer diameter larger than an outer diameter of upper and lower ends.