CN211721889U

CN211721889U - Folding type electron cigarette shell

Info

Publication number: CN211721889U
Application number: CN201922472973.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-10-23
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a folded form electron cigarette shell, including at least three side and at least one bottom surface, between the side with swivelling joint and/or magnetism are connected between the bottom surface, and the connection can be dismantled to at least a pair of adjacent side, the bottom surface is connected with two at least sides, the bottom surface is connected with at least one of side and can be dismantled. Adopt above-mentioned technical scheme, the folding type electron cigarette shell is collapsible and expandes, the side can assemble, rotatory formation tube-shape, the side also can expand, is located the coplanar, the bottom surface is also located the coplanar or with the side separation with the side through dismantling, rotatory, saves space, is convenient for deposit or carry.

Description

Folding type electron cigarette shell

The technical field is as follows:

the utility model relates to an electron cigarette accessory field, concretely relates to folded form electron cigarette shell.

Background art:

the electronic cigarette is an electronic product simulating a cigarette, and has the same smoke, taste and feeling as the cigarette. It is a product which is absorbed by users after nicotine and the like are changed into steam by means of atomization and the like. Traditional cigarette is very big to the health hazard, and more electron cigarettes appear in the existing market to satisfy smoking crowd's needs, the smoker can dispose electron cigarette shell usually, places the electron cigarette in it, protects the electron cigarette, prevents mechanical damage or device pollution.

The utility model has the following contents:

specifically, the utility model provides a folding type electron cigarette shell, including at least three side and at least one bottom surface, between the side with swivelling joint and/or magnetism are connected between the bottom surface, and the connection can be dismantled to at least a pair of adjacent side, the bottom surface is connected with two at least sides, the bottom surface can be dismantled with at least one of side and be connected.

By adopting the technical scheme, the folding electronic cigarette shell can be folded and unfolded, the side faces can be assembled and rotated to form a cylinder shape, the side faces can also be unfolded and positioned on the same plane, and the bottom face is also positioned on the same plane with the side faces or separated from the side faces through disassembly and rotation, so that the space is saved, and the folding electronic cigarette shell is convenient to store or carry; the bottom surface can comprise a lower bottom surface, and also can comprise an upper bottom surface and a lower bottom surface; the side surfaces can form a square cylinder shape, a three-side cylinder shape, a five-side cylinder shape and the like, only one pair of adjacent side surfaces can be detached, and all the adjacent side surfaces can be detached. If only one bottom surface is provided, the electronic cigarette is convenient to take out or the cigarette holder part is exposed, and if two bottom surfaces are provided, the cigarette holder part can be protected.

Preferably, the side surface is a flat surface, the number of sides of the bottom surface is the same as the number of sides of the side surface, and the side surface and the bottom surface form a polygonal cylinder. More preferably, the polygonal cylinder is a regular polygonal cylinder.

Adopt above-mentioned technical scheme, folded form electron cigarette shell structure is firm, better protects the electron cigarette, prevents to collide with.

Preferably, the number of sides is even.

By adopting the technical scheme, the side faces can be flattened into two layers which are overlapped up and down under the condition of not being detached, and the folding side faces are folded under the condition of not opening the side faces, so that the space is saved, and the carrying is convenient.

Preferably, the number of the side faces is odd, and the side faces can be flattened into two layers which are overlapped up and down.

By adopting the technical scheme, when the cylinder shape enclosed by the side surfaces is a non-regular polygon, one group of adjacent side length sum is equal to the other group of adjacent side length sum, and the two groups of adjacent side length sum can be flattened into two overlapped layers.

Preferably, the rotational connection is a hinge.

Adopt above-mentioned technical scheme, when swivelling joint mode is undetachable, can be connected swivelling joint and magnetism and use the cooperation, if swivelling joint is when dismantling, can only adopt swivelling joint.

Preferably, at least one of the connections of the bottom surface to the side surface is a magnetic connection.

More preferably, the bottom surface is connected with one side surface in a rotating way, and the rest are connected in a magnetic way.

By adopting the technical scheme, the bottom surface is convenient to open, and the electronic cigarette is convenient to expose from the bottom surface.

Preferably, one side of the rotary connection is provided with a rotating shaft, the other side of the rotary connection is provided with a rotary accommodating groove, and the rotating shafts are arranged in the rotary accommodating groove and matched in size; one side of the rotating shaft and the rotating accommodating groove is provided with a rotating boss, the other side of the rotating shaft and the rotating accommodating groove is provided with a rotating groove, and the rotating boss is arranged in the rotating groove and matched with the rotating groove in size. Namely, the rotating shaft can be provided with a rotating boss and a rotating accommodating groove, or the rotating shaft can be provided with a rotating groove and a rotating accommodating groove, and the rotating boss is arranged on the rotating accommodating groove.

Preferably, the cross section of the rotary lug boss and the rotary groove is circular.

By adopting the technical scheme, the rotary connection can be disassembled through micro deformation, so that the side face and the side face or the side face and the bottom face can be assembled and disassembled conveniently.

Preferably, one side of the magnetic connection is provided with a first magnetic part, the other side is provided with a second magnetic part, the first magnetic part and the second magnetic part are made of magnetic materials, and at least one side is made of permanent magnetic materials.

By adopting the technical scheme, the side face and the side face or the side face and the bottom face are detachably connected, so that the assembly and the disassembly are convenient.

Preferably, at least one of the connections between the sides is a magnetic connection.

More preferably, the pair of adjacent side surfaces are magnetically connected, and the connection between the rest side surfaces is a rotary connection.

By adopting the technical scheme, the side face of the electronic cigarette can be conveniently opened, and the electronic cigarette can be conveniently placed and taken.

Further, a sliding groove and a sliding piece are arranged on the side face, the sliding piece comprises an installation portion, a connection portion and a push-pull portion, the connection portion is located in the sliding groove, the installation portion and the push-pull portion are located on two sides of the side face, the outer diameter of the installation portion is larger than the width of the sliding groove, and the sliding piece can slide in the sliding groove. Preferably, the outer diameter of the push-pull portion is also larger than the width of the sliding groove.

By adopting the technical scheme, the sliding part can be pushed in the sliding groove and does not fall off, the mounting part is used for mounting the electronic cigarette, the push-pull part is used for pushing by a user to enable the sliding part to slide in the sliding groove and drive the electronic cigarette to slide along the direction of the sliding groove, so that the cigarette holder of the electronic cigarette is exposed, the electronic cigarette can be sucked under the condition that the electronic cigarette does not depart from the shell, and the electronic cigarette can slide back to the original position when not used, thereby protecting the electronic cigarette and preventing the cigarette holder from being polluted.

Further, the side is provided with the installation holding tank, the installation department can be arranged in the installation holding tank, the side is provided with the push-pull holding tank, push-pull portion can be arranged in the push-pull holding tank.

By adopting the technical scheme, when the installation part is arranged in the installation accommodating groove, the push-pull part is arranged in the push-pull accommodating groove, and the connecting part is arranged in the sliding groove, the sliding part and the side surface are positioned on the same plane, so that the sliding part can be accommodated, and the space is saved.

Preferably, the mounting portion is annular and made of elastic material.

Adopt above-mentioned technical scheme, the electron cigarette can be inserted in the installation department, by the tight hoop of cyclic annular ann commentaries on classics portion, the slider is suitable for the electron cigarette of multiple shape.

Preferably, the mounting portion is in the shape of a major arc.

By adopting the technical scheme, the electronic cigarette can be clamped in the mounting part, and the electronic cigarette is suitable for cylindrical electronic cigarettes and convenient to mount and take.

Preferably, the push-pull part is a bump. More preferably, the projection is provided with a convex rib.

By adopting the technical scheme, the push-pull part is convenient for a user to push.

Preferably, the push-pull part is a tab.

By adopting the technical scheme, the push-pull part can be pushed, is convenient to pull or be connected with other objects, and is convenient to carry.

Further, the bottom surface includes an upper bottom surface and a lower bottom surface, be provided with on the upper bottom surface and inhale the hole, the lower bottom surface is provided with the air vent.

By adopting the scheme, the electronic cigarette can be arranged in the shell of the folding electronic cigarette and is directly utilized for sucking through the sucking hole, and the vent hole is used for balancing pressure and is convenient for sucking.

The utility model has the advantages as follows:

1. the foldable electronic cigarette shell can be folded and unfolded, the side faces can be assembled and rotated to form a cylinder shape, the side faces can also be unfolded and are positioned on the same plane, the bottom face is also positioned on the same plane with the side faces or separated from the side faces through disassembly and rotation, so that the space is saved, and the foldable electronic cigarette shell is convenient to store or carry;

2. the side surfaces can be flattened into two layers which are overlapped up and down under the condition of not being detached, and the side surfaces can be folded under the condition of not opening the side surfaces, so that the space is saved, and the carrying is convenient;

3. through the slider slides in the sliding tray, drives the electron cigarette and slides along the sliding tray direction to make the cigarette holder of electron cigarette show out, make the electron cigarette not deviate from and can suck under the shell circumstances, the slip returns the normal position when not using, realizes the protection to the electron cigarette, and prevents that the cigarette holder from polluting.

Description of the drawings:

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a closed state perspective view of an embodiment of the housing of the foldable electronic cigarette of the present invention;

fig. 2 is a perspective view of an opened state of an embodiment of the housing of the foldable electronic cigarette of the present invention;

fig. 3 is a perspective view of an embodiment of the foldable electronic cigarette casing in a flattened state;

fig. 4 is a perspective view of another perspective view of a closed state of an embodiment of the foldable electronic cigarette casing of the present invention;

fig. 5 is a front perspective view of a closed state of one embodiment of a housing of a foldable electronic cigarette according to the present invention;

fig. 6 is a perspective view of an embodiment of a fourth side of the present invention;

fig. 7 is a perspective view of an embodiment of a first side of the present invention;

FIG. 8 is a perspective view of one embodiment of a slider according to the present invention;

fig. 9 is a perspective view of an open state of another embodiment of the housing of the foldable electronic cigarette of the present invention;

fig. 10 is a perspective view of another embodiment of the sliding member of the present invention;

description of reference numerals:

through the above reference sign explanation, combine the embodiment of the utility model, can more clearly understand and explain the technical scheme of the utility model.

100. A side surface; 101. a first side surface; 102. a second side surface; 103. a third side; 104. a fourth side; 110. a sliding groove; 120. a slider; 121. an installation part; 122. a connecting portion; 123. a push-pull section; 1231. a bump; 1232. a pull ring; 130. installing an accommodating groove; 140. push-pull accommodating grooves; 200. a bottom surface; 310. a rotating shaft; 311. rotating the boss; 320. rotating the accommodating groove; 321. rotating the groove; 330. a first magnetic member; 340. second magnetic part

The specific implementation mode is as follows:

reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

As shown in fig. 1-3, the present invention provides a folding electronic cigarette case, comprising at least three sides 100 and at least one bottom surface 200, wherein the sides 100 are connected with the bottom surface 200 by rotation and/or magnetic connection, at least one pair of adjacent sides 100 can be detachably connected, the bottom surface 200 is connected with at least two sides 100, and the bottom surface 200 is detachably connected with at least one of the sides 100. The rotary connection can be at least one of hinged connection, movable riveting and crease connection, the magnetic connection means that both sides of the connection are made of magnetic materials, one side is made of permanent magnetic materials, and the other side is made of soft magnetic materials or permanent magnetic materials. The permanent magnet material can be neodymium iron boron magnet (Nd2Fe14B), samarium cobalt magnet (SmCo), alNiCo permanent magnet alloy (AlNiCo), magnet (Fe3O4), nickel zinc Ferrite (Ferrite) etc, the soft magnetic material can be iron, iron system alloy, permalloy, Ferrite compound etc, bottom surface 200 and side 100 can itself adopt the magnetism material, also can itself not be the magnetism material, but sets up magnetic part. The magnetic connection is detachable connection, and the hinged or movably riveted detachable connection can complete connection and separation of the two parts through micro deformation. The connection mode can be magnetic connection, can be swivelling joint, and wherein at least one swivelling joint can dismantle, and the connection mode also can swivelling joint and magnetic connection cooperation use, if can dismantle the position and be magnetic connection, other connection positions are swivelling joint.

By adopting the technical scheme, the folding electronic cigarette shell can be folded and unfolded, the side surface 100 can be assembled and rotated to form a cylinder shape, the side surface 100 can also be unfolded and positioned on the same plane, and the bottom surface 200 is also positioned on the same plane with the side surface 100 or separated from the side surface 100 through disassembly and rotation, so that the space is saved, and the folding electronic cigarette shell is convenient to store or carry; the bottom surface 200 may include a lower bottom surface 200, and may also include an upper bottom surface 200 and a lower bottom surface 200; the side surfaces 100 may be formed in a square cylinder shape, a three-side cylinder shape, a five-side cylinder shape, etc., only one pair of adjacent side surfaces 100 may be detachable, or all adjacent side surfaces 100 may be detachable. If only one bottom surface 200 is provided, the electronic cigarette is convenient to take out or the cigarette holder part is exposed, and if two bottom surfaces 200 are provided, the cigarette holder part can be protected. The side 100 may also be cambered and may be assembled into a cylinder.

In a preferred embodiment of the present invention, the side surface 100 is a flat surface, the number of sides of the bottom surface 200 is the same as the number of sides 100, and the side surface 100 and the bottom surface 200 form a polygonal cylinder shape. The polygonal cylinder is in a general approximate shape, the bottom surface 200 can exceed the edge formed by the surrounding of the side surface 100, and the connecting part can be provided with lugs and/or convex ribs.

In a preferred embodiment of the present invention, the polygonal cylinder is a regular polygonal cylinder.

In a preferred embodiment of the present invention, the number of the side surfaces 100 is an even number. Such as 4, 6, 8, etc.

In a preferred embodiment of the present invention, the number of the side surfaces is 4, including a first side surface 101, a second side surface 102, a third side surface 103, and a fourth side surface 104.

By adopting the technical scheme, the side surface 100 can be flattened into two layers which are overlapped up and down under the condition of not being detached, and the side surface 100 is folded under the condition of not opening, so that the space is saved, and the carrying is convenient.

In a preferred embodiment of the present invention, the number of the side surfaces 100 is an odd number, and the side surfaces 100 can be flattened into two layers overlapped up and down.

By adopting the technical scheme, when the cylinder shape enclosed by the side surfaces 100 is a non-regular polygon, the sum of the side lengths of one group of adjacent groups is equal to the sum of the side lengths of the other group of adjacent groups, and the cylinder shape can be flattened into two overlapped layers.

In a preferred embodiment of the present invention, the rotational connection is an articulation.

In the utility model discloses a preferred embodiment, swivelling joint's both sides set up the axle sleeve, through the bolt fastening, realize dismantling the connection.

In a preferred embodiment of the present invention, at least one of the connections of the bottom surface 200 and the side surface 100 is a magnetic connection.

In a preferred embodiment of the present invention, the bottom surface 200 is connected to the side surface 100 in a rotatable manner, and the other is connected magnetically.

By adopting the technical scheme, the bottom surface 200 is convenient to open, and the electronic cigarette is convenient to expose from the bottom surface 200.

Referring to fig. 5 to 7, in a preferred embodiment of the present invention, one side of the rotation connection is provided with a rotation shaft 310, and the other side is provided with a rotation receiving groove 320, and the rotation shaft 310 is disposed in the rotation receiving groove 320 and matched in size; the rotation shaft 310 and the rotation receiving groove 320 are provided with a rotation boss 311 on one side and a rotation groove 321 on the other side, and the rotation boss 311 is disposed in the rotation groove 321 and matched in size. That is, the rotation boss 311 may be provided on the rotation shaft 310 and the rotation receiving groove 321 may be provided on the rotation receiving groove 320, or the rotation boss 311 may be provided on the rotation shaft 310 and the rotation receiving groove 320 may be provided on the rotation receiving groove 321.

In a preferred embodiment of the present invention, the cross-sections of the rotary bosses 311 and the rotary grooves 321 are circular.

By adopting the technical scheme, the rotary connection can be disassembled through micro deformation, so that the side surfaces 100 or the side surfaces 100 and the bottom surface 200 can be assembled and disassembled conveniently.

In a preferred embodiment of the present invention, one of the magnetic connection sets up the first magnetic member 330, the other sets up the second magnetic member 340, the first magnetic member 330 and the second magnetic member 340 are made of magnetic material, and at least one of the magnetic members is made of permanent magnetic material.

By adopting the technical scheme, the side surfaces 100 or the side surfaces 100 and the bottom surface 200 are detachably connected, so that the assembly and the disassembly are convenient.

In a preferred embodiment of the present invention, at least one of the connections between the sides 100 is a magnetic connection.

In a preferred embodiment of the present invention, the pair of adjacent sides 100 are magnetically connected, and the connection between the other sides 100 is a rotational connection.

By adopting the technical scheme, the side face 100 can be conveniently opened, and the electronic cigarette can be conveniently placed and taken.

Referring to fig. 2 to 4, in a preferred embodiment of the present invention, the side surface 100 is provided with a sliding groove 110 and a sliding member 120, the sliding member 120 includes an installation portion 121, a connection portion 122 and a push-pull portion 123, the connection portion 122 is located in the sliding groove 110, the installation portion 121 and the push-pull portion 123 are located on two sides of the side surface 100, an outer diameter of the installation portion 121 is greater than a width of the sliding groove 110, and the sliding member 120 is capable of sliding in the sliding groove 110. In a preferred embodiment of the present invention, the outer diameter of the push-pull portion 123 is also larger than the width of the sliding groove 110.

By adopting the technical scheme, the sliding part 120 can be pushed in the sliding groove 110 and does not fall off, the mounting part 121 is used for mounting the electronic cigarette, and the push-pull part 123 is pushed by a user to enable the sliding part 120 to slide in the sliding groove 110 and drive the electronic cigarette to slide along the direction of the sliding groove 110, so that the cigarette holder of the electronic cigarette is exposed, the electronic cigarette can be sucked without being separated from the shell, and the electronic cigarette can slide back to the original position when not used, thereby protecting the electronic cigarette and preventing the cigarette holder from being polluted.

In a preferred embodiment of the present invention, the side surface 100 is provided with an installation accommodation groove 130, the installation portion 121 can be disposed in the installation accommodation groove 130, the side surface 100 is provided with a push-pull accommodation groove 140, and the push-pull portion 123 can be disposed in the push-pull accommodation groove 140. The mounting portion 121 can be disposed in the mounting receiving groove 130, that is, the depth of the mounting receiving groove 130 is not less than the thickness of the mounting portion 121, the mounting portion 121 can project into the contour of the mounting receiving groove 130, and the push-pull portion 123 is similar to the push-pull receiving groove 140.

By adopting the above technical scheme, when the mounting portion 121 is disposed in the mounting receiving groove 130, the push-pull portion 123 is disposed in the push-pull receiving groove 140, and the connecting portion 122 is disposed in the sliding groove 110, the sliding member 120 and the side surface 100 are located on the same plane, so that the sliding member 120 is accommodated, and the space is saved.

In a preferred embodiment of the present invention, the mounting portion 121 is annular and made of an elastic material. The elastic material can be one of polyphenyl ether (PPE), polyolefin thermoplastic elastomer (TPO), thermoplastic ethylene propylene diene monomer dynamic vulcanized elastomer (TPV), thermoplastic ethylene propylene diene monomer dynamic vulcanized elastomer (TPE), styrene thermoplastic elastomer (SBS), Natural Rubber (NR) and Butadiene Rubber (BR).

By adopting the above technical scheme, the electronic cigarette can be inserted into the mounting part 121 and tightly hooped by the annular mounting part 121, and the sliding part 120 is suitable for electronic cigarettes of various shapes.

Referring to fig. 8, in a preferred embodiment of the present invention, the mounting portion 121 has a major arc shape.

Adopt above-mentioned technical scheme, the electron cigarette can block in installation department 121, is suitable for cylindrical electron cigarette, and the electron cigarette of being convenient for is installed and is taken.

In a preferred embodiment of the present invention, the push-pull portion 123 is a bump 1231.

In a preferred embodiment of the present invention, the projection 1231 is provided with a rib.

With the above technical solution, the push-pull portion 123 is convenient for a user to push.

Referring to fig. 9 to 10, in a preferred embodiment of the present invention, the push-pull part 123 is a pull ring 1232.

By adopting the technical scheme, the push-pull part 123 can push, is convenient to pull or connect with other objects, and is convenient to carry.

In a preferred embodiment of the present invention, the bottom surface 200 includes an upper bottom surface and a lower bottom surface, the upper bottom surface is provided with a suction hole, and the lower bottom surface is provided with an air vent.

The utility model discloses not only can be applicable to electron cigarette accessory field, other accessories all can cooperate the use.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a folded form electron cigarette shell which characterized in that: the connecting structure comprises at least three side surfaces (100) and at least one bottom surface (200), wherein the side surfaces (100) are connected with each other in a rotating and/or magnetic mode, the side surfaces (100) are connected with the bottom surface (200) in a magnetic mode, at least one pair of adjacent side surfaces (100) are detachably connected with each other, the bottom surface (200) is connected with at least two side surfaces (100), and the bottom surface (200) is detachably connected with at least one side surface (100).

2. The folding-type electronic cigarette housing of claim 1, wherein: the side surface (100) is a plane, the number of sides of the bottom surface (200) is the same as that of the side surface (100), and the side surface (100) and the bottom surface (200) form a polygonal cylinder.

3. The folding-type electronic cigarette housing of claim 2, wherein: at least one of the connection between the side surfaces (100) or the connection of the bottom surface (200) to the side surfaces (100) is a magnetic connection.

4. The folding-type electronic cigarette housing of claim 3, wherein: the number of the side surfaces (100) is even.

5. The folding-type electronic cigarette housing of claim 4, wherein: the swivel connection is a hinge.

6. The folding-type electronic cigarette housing of claim 5, wherein: one side of the rotary connection is provided with a rotating shaft (310), the other side of the rotary connection is provided with a rotary accommodating groove (320), and the rotating shaft (310) is arranged in the rotary accommodating groove (320) and matched in size; one side of the rotating shaft (310) and the rotating accommodating groove (320) is provided with a rotating boss (311), the other side of the rotating shaft is provided with a rotating groove (321), and the rotating boss (311) is arranged in the rotating groove (321) and matched in size.

7. The folding electronic cigarette housing of claim 6, wherein: one side of the magnetic connection is provided with a first magnetic part (330), the other side is provided with a second magnetic part (340), the first magnetic part (330) and the second magnetic part (340) are made of magnetic materials, and at least one side is made of permanent magnetic materials.

8. The folding-type e-cigarette housing of any one of claims 1-7, wherein: the side surface (100) is provided with a sliding groove (110) and a sliding piece (120), the sliding piece (120) comprises an installation part (121), a connection part (122) and a push-pull part (123), the connection part (122) is located in the sliding groove (110), the installation part (121) and the push-pull part (123) are located on two sides of the side surface (100), the outer diameter of the installation part (121) is larger than the width of the sliding groove (110), and the sliding piece (120) can slide in the sliding groove (110).

9. The folding-type electronic cigarette housing of claim 8, wherein: the side surface (100) is provided with an installation accommodating groove (130), the installation part (121) can be arranged in the installation accommodating groove (130), the side surface (100) is provided with a push-pull accommodating groove (140), and the push-pull part (123) can be arranged in the push-pull accommodating groove (140).

10. The folding electronic cigarette housing of claim 9, wherein: the bottom surface (200) comprises an upper bottom surface and a lower bottom surface, the upper bottom surface is provided with a suction hole, and the lower bottom surface is provided with a vent hole.