CN220911270U

CN220911270U - Clamping assembly

Info

Publication number: CN220911270U
Application number: CN202322737609.4U
Authority: CN
Inventors: 张小东; 王军; 柯雁
Original assignee: Shenzhen Neewer Technology Co Ltd
Current assignee: Shenzhen Neewer Technology Co Ltd
Priority date: 2023-10-11
Filing date: 2023-10-11
Publication date: 2024-05-07
Anticipated expiration: 2033-10-11

Abstract

The utility model discloses a clamping assembly, which comprises a first connecting seat, a second connecting seat, a connecting piece and a limiting structure, wherein the first connecting seat is provided with at least two mounting holes and an avoidance hole communicated with the limiting holes, the at least two mounting holes are arranged at intervals along the circumferential direction of the first connecting seat, the second connecting seat is connected with the first connecting seat, the second connecting seat is provided with at least two elastic pushing and pressing parts, the elastic pushing and pressing parts are in one-to-one correspondence with the limiting holes, the connecting piece penetrates through the limiting holes, the connecting piece is provided with a first stop part, the first stop part extends along the radial direction of the connecting piece and is suitable for penetrating through the avoidance hole, the first stop part is used for being abutted against the periphery of the limiting hole, the elastic pushing and pressing part is used for being abutted against the end part of the connecting piece, the connection between the first stop part and the first connecting seat can be released without additionally arranging an unlocking button, and the structure of the clamping assembly can be simplified, so that the production and manufacturing cost of the clamping assembly can be reduced.

Description

Clamping assembly

Technical Field

The utility model relates to the technical field of lamp assembly accessories, in particular to a clamping assembly.

Background

As is well known, in the case of assembling a conventional lamp housing, the lamp housing is generally assembled by a clip assembly in order to improve the efficiency of assembling and disassembling the lamp housing. Because current joint subassembly is in order to guarantee that the lamp shade joint is firm, is equipped with the unblock piece generally, and the joint subassembly is spacing through the joint of the removal contact lamp shade of unblock piece, and the structure of joint subassembly is complicated, leads to the manufacturing cost of joint subassembly high.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the clamping assembly, which can simplify the structure of the clamping assembly so as to reduce the production cost of the clamping assembly.

According to the clamping assembly, the clamping assembly comprises a first connecting seat, a second connecting seat, a connecting piece and a limiting structure, wherein the first connecting seat is provided with at least two mounting holes, each mounting hole comprises a limiting hole and an avoidance hole communicated with the limiting hole, at least two mounting holes are arranged at intervals along the circumferential direction of the first connecting seat, the second connecting seat is connected with the first connecting seat, the second connecting seat is provided with at least two elastic pushing parts, the elastic pushing parts are in one-to-one correspondence with the limiting holes, the connecting piece penetrates through the limiting holes, the connecting piece is provided with a first stopping part, the first stopping part extends along the radial direction of the connecting piece and is suitable for penetrating through the avoidance hole, the first stopping part is used for being abutted to the periphery of the limiting hole, and the elastic pushing parts are used for being abutted to the end part of the connecting piece.

The clamping assembly provided by the embodiment of the utility model has at least the following beneficial effects:

The connecting piece is used for being connected with the lampshade, when the lampshade is installed, an operator can insert the connecting piece into the avoidance hole and rotate the lampshade so that the connecting piece enters the limiting hole, the elastic pushing part can push the first stopping part to be abutted with the periphery of the limiting hole under the elastic action, and therefore the connecting piece is limited to be separated from the first connecting seat, and the assembly of the lampshade can be completed; when the lampshade is disassembled, an operator can press the lampshade and then press the connecting piece, so that the first stop part is separated from the periphery of the limiting hole, the operator can rotate the lampshade in the opposite direction, the connecting piece moves in the direction close to the avoidance hole, when the connecting piece is positioned in the avoidance hole, the operator can take out the first stop part from the avoidance hole to take out the connecting piece, the lampshade is separated, the unlocking button is not required to be additionally arranged, the connection between the first stop part and the first connecting seat can be relieved, the structure of the clamping assembly can be simplified, and the production and manufacturing cost of the clamping assembly is reduced.

According to some embodiments of the utility model, a limiting structure is arranged between the first connecting seat and the connecting piece, and the limiting structure is used for limiting the connecting piece to move along a direction approaching to the avoidance hole.

According to some embodiments of the utility model, the limiting structure includes a limiting groove disposed at a periphery of the limiting hole, and the first stop portion is accommodated in the limiting groove and abuts against a side wall of the limiting groove.

According to some embodiments of the utility model, the connecting piece is provided with a second stop part, the first stop part is opposite to the second stop part along the axial direction of the connecting piece, and the periphery of the limiting hole away from the first stop part can be abutted with the second stop part.

According to some embodiments of the utility model, an end of the connecting member remote from the first stop portion is provided with a threaded portion, the threaded portion being disposed along an axial direction of the connecting member.

According to some embodiments of the utility model, the second connecting seat further has a connecting portion connected to the first connecting seat, the elastic pressing portion includes an elastic portion and a pressing portion, the pressing portion is connected to the connecting portion through the elastic portion, and the elastic portion is used for moving the pressing portion in a direction approaching the limiting hole.

According to some embodiments of the utility model, the connecting portion, the elastic portion and the pushing portion are of a unitary structure.

According to some embodiments of the utility model, the elastic portion is provided with a guiding surface, and a distance between the guiding surface and a periphery of the limiting hole is gradually reduced along a direction approaching the limiting hole.

According to some embodiments of the utility model, the connecting parts are provided with at least two connecting parts, and the connecting parts are in one-to-one correspondence with the elastic pushing parts.

According to some embodiments of the present utility model, a first guiding portion and a second guiding portion are disposed at a communication position between the limiting hole and the avoidance hole, the first guiding portion and the second guiding portion are disposed opposite to each other, and a distance between the first guiding portion and the second guiding portion is gradually reduced along a direction away from the avoidance hole.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a structure of a clamping assembly according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a clip assembly according to an embodiment of the present utility model;

FIG. 3 is a top view of a clip assembly according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a schematic structural view of a first connecting seat according to an embodiment of the utility model;

FIG. 6 is a schematic view of a first connecting seat according to another embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a second connection seat according to an embodiment of the present utility model;

FIG. 8 is a schematic structural view of a connector according to an embodiment of the present utility model;

Fig. 9 is an exploded view of another embodiment of a clip assembly according to an embodiment of the present utility model.

Reference numerals:

The first connecting seat 100, the avoidance hole 110, the limit hole 120, the limit groove 130, the first guide portion 140, the second guide portion 150, the positioning portion 160, the second connecting seat 200, the positioning groove 201, the elastic pressing portion 210, the elastic portion 211, the pressing portion 212, the guide surface 213, the connecting portion 220, the connecting member 300, the first stop portion 310, the second stop portion 320, the threaded portion 330, and the screwing portion 340.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 4, according to an embodiment of the present utility model, the clamping assembly includes a first connecting seat 100, a second connecting seat 200, a connecting piece 300 and a limiting structure, the first connecting seat 100 is provided with at least two mounting holes, the mounting holes include a limiting hole 120 and a avoiding hole 110 communicated with the limiting hole 120, the at least two mounting holes are arranged at intervals along the circumferential direction of the first connecting seat 100, the second connecting seat 200 is connected with the first connecting seat 100, the second connecting seat 200 is provided with at least two elastic pushing parts 210, the elastic pushing parts 210 are in one-to-one correspondence with the limiting hole, the connecting piece 300 is arranged in the limiting hole 120 in a penetrating manner, the connecting piece 300 is provided with a first stop part 310, the first stop part 310 extends along the radial direction of the connecting piece 300 and is suitable for penetrating through the avoiding hole 110, the first stop part 310 is used for being abutted to the periphery of the limiting hole 120, the elastic pushing parts 210 are used for being abutted to the end part of the connecting piece 300, thus, the connection between the first stop part 310 and the first connecting seat 100 can be released without additionally arranging an unlocking button, and the structure of the clamping assembly can be simplified, thereby the manufacturing cost of the clamping assembly can be reduced.

Specifically, when the connector 300 is used for connecting with a lampshade, and the lampshade is installed, an operator can insert the connector 300 into the avoidance hole 110 and rotate the lampshade so that the connector 300 enters the limit hole 120, and the elastic pushing part 210 can push the end part of the connector 300 so that the first stop part 310 is abutted with the periphery of the limit hole 120, thus the installation of the lampshade can be completed; when the lampshade is detached, an operator can press the lampshade and then press the connecting piece 300, so that the first stop part 310 is separated from the periphery of the limiting hole 120, the operator can rotate the lampshade in the opposite direction, the connecting piece 300 moves along the direction close to the avoidance hole 110, when the connecting piece 300 is positioned in the avoidance hole 110, the operator can take out the first stop part 310 from the avoidance hole 110 to separate the lampshade, the connection between the connecting piece 300 and the first connecting seat 100 can be released without additionally arranging an unlocking button, the connecting piece 300 is separated from the first connecting seat 100, the structure of the clamping assembly can be simplified, and the production and manufacturing cost of the clamping assembly is reduced.

It should be noted that, in some embodiments, the lampshade may be replaced by other accessories that need to be replaced or detached, such as auxiliary equipment of photographic equipment, which is not described in detail herein.

Referring to fig. 4 to 6, in some embodiments of the present utility model, a limiting structure is disposed between the connecting member 300 and the first connecting seat 100, and the limiting structure is used to limit the movement of the connecting member 300 along the direction approaching to the avoidance hole 110, so as to improve the reliability of the clamping assembly.

Specifically, when the lampshade is installed, an operator can insert the connecting piece 300 into the avoidance hole 110 and rotate the lampshade so that the connecting piece 300 enters the limiting hole 120, and the elastic pushing part 210 can push the end part of the connecting piece 300 so that the limiting structure is connected, and therefore the installation of the lampshade can be completed; when the lamp shade is detached, an operator can press the lamp shade and then press the connecting piece 300, so that the limiting structure is disconnected, the operator can rotate the lamp shade in the opposite direction, the connecting piece 300 moves along the direction close to the avoidance hole 110, when the connecting piece 300 is positioned in the avoidance hole 110, the operator can take out the connecting piece 300 from the avoidance hole 110 to separate the lamp shade, the limiting structure can be relieved without additionally arranging an unlocking button, the structure of the clamping assembly can be simplified, and the production and manufacturing cost of the clamping assembly is reduced.

Referring to fig. 4 to 6, in some embodiments of the present utility model, the limiting structure includes a limiting groove 130 disposed at a periphery of the avoidance hole 110, and the first stop portion 310 is accommodated in the limiting groove 130 and abuts against a side wall of the limiting groove 130, so as to limit the movement of the connecting member 300 along a direction approaching to the avoidance hole 110, so as to improve the reliability of the use of the clamping assembly.

Specifically, the limiting hole 120 has an arc structure, the limiting hole 120 extends along the circumferential direction of the first connecting seat 100, one end of the limiting hole 120 is communicated with the avoidance hole 110, the limiting groove 130 is arranged at the periphery of one end of the limiting hole 120 far away from the avoidance hole 110, and when the limiting structure is connected, the limiting part is accommodated in the limiting groove 130 and can be abutted with the side wall of the limiting groove 130, so that the connecting piece 300 can be limited to move along the direction close to the avoidance hole 110, and the use reliability of the clamping assembly is improved; when the limiting structure is disconnected, the limiting portion exits the limiting groove 130, the connecting piece 300 is inserted into the limiting hole 120, and the connecting piece 300 can move along the direction close to the avoiding hole 110, so that the connecting piece 300 can be separated from the first connecting seat 100.

It should be noted that, the positions of the limiting groove 130 and the limiting portion may also be interchanged, that is, the limiting groove 130 is disposed on the connecting member 300, the limiting portion is disposed on the periphery of the limiting hole 120, and the connecting member 300 may be limited to move along the direction approaching to the avoiding hole 110, which is not described in detail herein.

Of course, in some embodiments, the limiting structure may also be a structure in which the limiting pin is matched with the limiting groove 130, the limiting pin is disposed on the connecting piece 300, the limiting groove 130 is still disposed on the periphery of the limiting hole 120, and the limiting pin is accommodated in the limiting groove 130 and can also limit the connecting piece 300 to move along the direction approaching to the avoidance hole 110, which is not described in detail herein. In addition, the limiting pin can be replaced by an elastic ball, and the limiting pin is not limited in this way.

Referring to fig. 4 and 8, in some embodiments of the present utility model, the connecting piece 300 is provided with a second stop portion 320, along the axial direction of the connecting piece 300, the first stop portion 310 and the second stop portion 320 are opposite to each other, and the periphery of the limiting hole 120 away from the first stop portion 310 can abut against the second stop portion 320, so that the distance that the first stop portion 310 exits from the limiting groove 130 can be limited, so that the situation that the elastic pushing portion 210 is excessively bent is avoided, and the service life of the second connecting seat 200 can be prolonged.

Referring to fig. 1 and 8, in some embodiments of the present utility model, a threaded portion 330 is disposed at an end of the connection member 300 remote from the first stop portion 310, and the threaded portion 330 is disposed along an axial direction of the connection member 300, so that assembling of the lamp housing can be facilitated.

Specifically, the threaded portion 330 is an external thread structure, a threaded hole matched with the threaded portion 330 can be formed in the lampshade, the connecting piece 300 and the lampshade can be detachably connected in a threaded connection mode, and the lampshade can be conveniently assembled on the clamping assembly.

The threaded portion 330 may be an internal threaded structure, and the lamp housing and the connector 300 may be connected by bolting, which is not limited herein.

Of course, in some embodiments, the connector 300 may also be connected to the lamp shade through a fastening structure, where the fastening structure includes a fastener disposed on the connector 300 and a fastening slot disposed on the lamp shade, and a hook portion of the fastener is accommodated in the fastening slot, i.e. the connector 300 and the lamp shade can be assembled, which will not be described in detail herein. In addition, the positions of the clip and the slot may be interchanged, that is, the clip is disposed on the lampshade, and the slot is disposed on the connector 300, which will not be described in detail herein.

It can be appreciated that the side of the first stopping portion 310 away from the threaded portion 330 is provided with a screwing portion 340, and by providing the screwing portion 340, an operator can screw the connecting member 300 through a screwing tool (such as an allen wrench or a screwdriver, etc.), so that the connecting member 300 is fixedly connected with the lampshade, which will not be described in detail herein.

Referring to fig. 4 and 7, in some embodiments of the present utility model, the second connection seat 200 further has a connection portion 220, the elastic pressing portion 210 includes an elastic portion 211 and a pressing portion 212, the pressing portion 212 is connected to the connection portion 220 through an elastic portion 2211, and the elastic portion 211 is used to move the pressing portion 212 in a direction approaching the limiting hole 120, so that an operator can conveniently break the limiting structure.

Specifically, one end of the elastic portion 211 is connected to the connecting portion 220, and one end of the elastic portion 211 away from the connecting portion 220 is connected to the pushing portion 212, so that when the lampshade is detached by providing the elastic portion 211, an operator can elastically move the pushing portion 212 in a direction away from the limiting hole 120 by pressing the lampshade, so that the first stop portion 310 can withdraw from the limiting groove 130, and rigid contact between the first stop portion 310 and the pushing portion 212 can be avoided; when the lamp shade is assembled, the pressing part 212 can automatically press the first stop part 310 into the limit groove 130 under the elastic action of the elastic part 211, so that the structure of the clamping assembly can be simplified.

It should be noted that, referring to fig. 9, the connection part 220 is configured with at least two connection parts 220 corresponding to the elastic pushing parts 210 one by one, so that the second connection socket 200 can be split into a plurality of parts, and the overall size of the second connection socket 200 can be reduced, so as to reduce the production cost of the second connection socket 200.

Referring to fig. 7, in some embodiments of the present utility model, the connecting portion 220, the elastic portion 211 and the pressing portion 212 are integrally formed, so that the number of dies can be reduced, and the manufacturing cost of the dies can be reduced, thereby reducing the manufacturing cost of the clamping assembly.

Specifically, the connecting portion 220, the elastic portion 211 and the pressing portion 212 may be integrally formed by bending a metal plate, so that the number of dies can be reduced, and the manufacturing cost of the dies is reduced, thereby reducing the manufacturing cost of the clamping assembly.

Of course, in some embodiments, the connection portion 220, the elastic portion 211, and the pressing portion 212 may be welded by welding, which is not limited herein.

Referring to fig. 7, in some embodiments of the present utility model, the elastic portion 211 is provided with a guide surface 213, and the distance between the guide surface 213 and the periphery of the limiting hole 120 is gradually reduced along the direction approaching the limiting hole 120, so that the connector 300 can be guided to move along the direction approaching the limiting hole 120, and the pushing portion 210 can be facilitated to push the connector 300 to connect the limiting structures.

Specifically, the guiding surface 213 has a planar structure, and the guiding surface 213 is obliquely disposed along a direction close to the limiting hole 120, so that the connector 300 can be guided, so that the connector 300 can move along a direction close to the limiting hole 120, and the pushing portion 210 can be convenient to push the connector 300, so that the limiting structure is connected.

It should be noted that, in some embodiments, the guiding surface 213 may also have a cambered surface structure, which is not limited herein.

Referring to fig. 5, in some embodiments of the present utility model, a first guiding portion 140 and a second guiding portion 150 are disposed at a communication position between the limiting hole 120 and the avoidance hole 110, the first guiding portion 140 and the second guiding portion 150 are disposed opposite to each other, and a distance between the first guiding portion 140 and the second guiding portion 150 is gradually reduced along a direction away from the avoidance hole 110, so that the connecting piece 300 can be guided, so that the connecting piece 300 can smoothly enter the limiting hole 120, and an operator can rotate the lampshade conveniently, so that the operator can install the lampshade conveniently.

Specifically, the first guiding portion 140 and the second guiding portion 150 are of round-angle structures, the first guiding portion 140 and the second guiding portion 150 are of horn-shaped structures, and the connecting piece 300 can be guided, so that the connecting piece 300 can smoothly enter the limiting hole 120, an operator can conveniently rotate the lampshade, and the operator can conveniently install the lampshade.

Note that, the first guide portion 140 and the second guide portion 150 may have a chamfer structure, and may be capable of guiding the connector 300, which is not limited herein.

Referring to fig. 6 and 7, in some embodiments of the present utility model, a positioning structure is disposed between the second connecting seat 200 and the first connecting seat 100, so as to enable circumferential positioning of the second connecting seat 200, so as to facilitate assembling the clamping assembly.

Referring to fig. 6 and 7, in some embodiments of the present utility model, the positioning structure includes a positioning portion 160 of the first connecting seat 100 and a positioning groove 201 provided on the second connecting seat 200, where the positioning groove 201 is accommodated in the positioning portion 160, so as to circumferentially position the second connecting seat 200, so as to facilitate assembling the clamping assembly.

Specifically, the positioning portion 160 is of a protruding structure, and the positioning portion 160 is accommodated in the positioning groove 201 and abuts against a side wall of the positioning groove 201, so that the second connecting seat 200 can be circumferentially positioned, and therefore the clamping assembly can be assembled conveniently.

It should be understood that the positions of the positioning portion 160 and the positioning slot 201 may be interchanged, that is, the positioning portion 160 is disposed on the second connecting seat 200, and the positioning slot 201 is disposed on the first connecting seat 100, which is not limited herein.

Of course, in some embodiments, the positioning structure may also be a structure that the positioning pin cooperates with the positioning hole, which is not described in detail herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The present embodiment has been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit.

Claims

1. A clamping assembly, comprising:

The device comprises a first connecting seat (100), wherein at least two mounting holes are formed in the first connecting seat (100), each mounting hole comprises a limiting hole (120) and an avoidance hole (110) communicated with the limiting hole (120), and the at least two mounting holes are arranged at intervals along the circumferential direction of the first connecting seat (100);

the second connecting seat (200) is connected with the first connecting seat (100), the second connecting seat (200) is provided with at least two elastic pushing parts (210), and the elastic pushing parts (210) are in one-to-one correspondence with the limiting holes (120);

The connecting piece (300) is worn to locate spacing hole (120), connecting piece (300) have first backstop portion (310), first backstop portion (310) are followed the radial direction of connecting piece (300) extends and is suitable for to pass dodge hole (110), first backstop portion (310) be used for the butt in the periphery of spacing hole (120), elasticity bulldoze portion (210) be used for the butt in the tip of connecting piece (300).

2. The clamping assembly according to claim 1, wherein a limiting structure is arranged between the first connecting seat and the connecting piece (300), and the limiting structure is used for limiting the connecting piece (300) to move along a direction approaching the avoidance hole (110).

3. The clamping assembly according to claim 2, wherein the limiting structure comprises a limiting groove (130) arranged at the periphery of the limiting hole (120), and the first stopping part (310) is accommodated in the limiting groove (130) and is abutted against the side wall of the limiting groove (130).

4. The clamping assembly according to claim 1, wherein the connecting piece (300) is provided with a second stopping portion (320), the first stopping portion (310) is opposite to the second stopping portion (320) along the axial direction of the connecting piece (300), and the limiting hole (120) is far away from the periphery of the first stopping portion (310) and can be abutted with the second stopping portion (320).

5. The clamping assembly according to claim 1, wherein a threaded portion (330) is provided at an end of the connecting member (300) remote from the first stop portion (310), the threaded portion (330) being disposed along an axial direction of the connecting member (300).

6. The clamping assembly according to claim 1, wherein the second connecting seat (200) further has a connecting portion (220), the connecting portion (220) is connected with the first connecting seat (100), the elastic pressing portion (210) includes an elastic portion (211) and a pressing portion (212), the pressing portion (212) is connected with the connecting portion (220) through the elastic portion (211), and the elastic portion (211) is used for enabling the pressing portion (212) to move in a direction approaching the limiting hole (120).

7. The clip assembly of claim 6, wherein the connecting portion (220), the elastic portion (211), and the pushing portion (212) are of unitary construction.

8. The clamping assembly according to claim 6, wherein the elastic portion (211) is provided with a guiding surface (213), and a distance between the guiding surface (213) and a periphery of the limiting hole (120) is gradually reduced along a direction approaching the limiting hole (120).

9. The clip assembly of claim 6, wherein at least two of the connection portions (220) are provided, the connection portions (220) being in one-to-one correspondence with the elastic pushing portions (210).

10. The clamping assembly according to claim 1, wherein a first guide portion (140) and a second guide portion (150) are arranged at a communication position of the limiting hole (120) and the avoidance hole (110), the first guide portion (140) and the second guide portion (150) are arranged opposite to each other, and a distance between the first guide portion (140) and the second guide portion (150) is gradually reduced along a direction away from the avoidance hole (110).