JP2005005101A - Connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector which does not cause trouble to release operation of a lock arm after a protective wall is installed. <P>SOLUTION: At a female housing 40, a lock arm 55 in a cantilever form is formed along a front and rear direction on the upper face 40A. The lock arm 55 holds a bending space 54 between it and the upper face 40A, and the free end side is made an operation part 58, and locking of both housings 10, 40 can be released by pressing operation thereto. Outside of the lock arm 55, the protective wall 61 is formed along the lock arm 55, and it prevents foreign matters from advancing into the bending space 54. Furthermore, on the rear end side of the protective wall 61, that is, in the sideward of the operation part 58, a broad-width part 62A is installed, and a release operation space when making a pressing operation to press and operate the operation part 58 is secured. Therefore, it is possible to carry out the release operation smoothly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connector.
[0002]
[Prior art]
Conventionally, a connector with a lock arm is known (for example, Patent Document 1). Specifically, the upper surface of the housing body is provided with a cantilevered lock arm extending from the front end to the rear end of the housing body and holding a bending space between the upper surface and the housing body. The lock arm is engaged with the connector housing and engaged with the mating housing to hold both the housings in a fitted state. On the other hand, in order to release the holding, the free end side of the lock arm may be pressed to cause the lock arm to be elastically displaced in the bending space.
Further, protective walls extending along the longitudinal direction of the lock arm are provided on both the left and right sides of the lock arm. This protects the lock arm and prevents the entry of electric wires and foreign objects into the flex space. .
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-182708
[Problems to be solved by the invention]
However, as the size of the connector and the lock arm is reduced, the dimensions between the protective walls become narrower. When the lock arm is released, the operator's finger interferes with the protective wall and the release operation is performed successfully. There was a possibility that it could not be done.
The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a connector that does not hinder the unlocking operation of the lock arm after providing a protective wall.
[0005]
[Means for Solving the Problems]
As a means for achieving the above object, the invention according to claim 1 has a bending space between the housing main body portion that can be fitted to the mating connector housing and the outer surface of the housing main body portion. And a lock arm that can be locked to a lock receiving portion provided in the counterpart connector housing, and the free end of the lock arm is an operation end. A connector that releases the locking between the lock arm and the lock receiving portion by a pressing operation to the lock arm, and the outer surface of the connector main body portion has the lock arm on the outer side in the width direction of the lock arm. A protection having a pair of side walls that extend along the arm and whose rear end position is substantially equal to or protrudes from the operation end of the lock arm. The side wall portion is provided on the base end side of the lock arm, and on the operation end side of the lock arm. It is characterized in that it is composed of a wide portion that is widely formed.
[0006]
According to a second aspect of the present invention, in the first aspect, the inner surface of the base portion is formed so as to extend straight from one end side to the other end side of the lock arm. It is characterized in that it is configured to be inclined so as to expand from the end of the inner surface toward the outer surface side of the side wall portion.
[0007]
Operation and effect of the invention
<Invention of Claim 1>
If the side of the bending space is open, a foreign object enters the bending space from there, or an electric wire drawn out from the housing enters the bending space by mistake. According to the first aspect of the present invention, the side of the bending space is closed by the base portion of the side wall, and the entry of the electric wire and the foreign matter into the bending space can be restricted. In addition, a wide width portion is positioned on the side of the operation portion of the lock arm, and a release operation space for pressing the operation portion of the lock arm is secured. Therefore, the release operation can be performed smoothly without the operator's fingertips interfering with the side wall portion during the connector release operation.
[0008]
<Invention of Claim 2>
According to the second aspect of the present invention, the wide width portion is inclined and its thickness gradually decreases toward the tip side. Therefore, compared with the case where the entire wide width portion is thinned, it is possible to suppress a decrease in strength of the side wall portion (wide width portion), and it is possible to set a clearance with the lock arm to a minimum while securing a release operation space. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
The connector of this embodiment includes a male housing (corresponding to the mating connector housing of the present invention) 10 and a female housing 40 that can be fitted to each other. The lock arm 55 formed on the male housing 10 is engaged with the lock receiving portion 13 formed on the male housing 10 to hold the two housings 10 and 40 in a fitted state, and the male terminal fitting 31 of the male housing 10 is connected to the female housing 40. And is connected to the female terminal fitting 71. In the following description, the surface side on which both housings 10 and 40 are fitted is defined as the front side.
[0010]
First, the male housing 10 will be described. As shown in FIG. 1, the male housing 10 is configured such that a hood portion 11 capable of fitting the female housing 40 from the front and a terminal accommodating portion 21 capable of accommodating the male terminal fitting 31 are connected back and forth. . The terminal accommodating portion 21 is formed in a substantially block shape that is long in the width direction, and a cavity 22 into which the male terminal fitting 31 can be inserted from the rear is provided.
[0011]
Here, the male terminal fitting 31 will be described. The male terminal fitting 31 is formed by bending a metal plate punched into a predetermined developed shape, and can be electrically connected to the mating female terminal fitting 71. It comprises a main tab portion 32, a substantially box-shaped main body portion 33, and a barrel portion (not shown) for connection to an electric wire. The tab portion 32 is formed by bending a long and narrow plate piece along the length direction before and after extending from the front edge of the main body portion 33.
[0012]
The cavity 22 is formed so as to penetrate the terminal accommodating portion 21 along the front-rear direction, and is arranged in two upper and lower stages and arranged in a plurality of chambers in the width direction. From the lower surface of each cavity 22, the lance 23 which can be elastically locked with respect to the main-body part 33 of the male terminal metal fitting 31 is provided. The lance 23 is cantilevered forward, and the tip side can be bent and displaced in the vertical direction. The male terminal fitting 31 is bent and displaced downward as it passes over the lance 23, and returns after passing. Thus, the male terminal fitting 31 is retained in the state where the tab portion 32 protrudes into the hood portion 11 by being engaged with the main body portion 33 of the male terminal fitting 31.
[0013]
As shown in FIG. 3, the lock arm receiving groove 12 is formed in the center portion of the ceiling surface 11 </ b> A of the hood portion 11 along the fitting direction of the housings 10 and 40. The lock arm accommodating groove 12 is formed with a width dimension that can accommodate a lock arm 55 of the female housing 40 to be described later, the rear end reaches the rear wall of the hood portion 11, and the front end side penetrates the front surface of the hood portion 11. It is configured to open. A lock receiving portion 13 is formed at a position near the front end of the lock arm housing groove 12 so as to protrude to the inside (lower side) of the hood portion 11. The lock receiving portion 13 has a shape such that the rear surface 13A side is substantially perpendicular to the ceiling surface 11A of the hood portion 11, and a lock arm 55 of the female housing 40 described below is engaged here. On the other hand, the front surface 13B side of the lock receiving portion 13 is formed in a tapered shape.
[0014]
Next, the female housing 40 will be described with reference to FIGS. The female housing 40 is made of synthetic resin, and is formed in a flat block shape having a wide width as a whole. Like the male housing 10 described above, the cavity 43 has two tiers in the vertical direction and a plurality of chambers in the width direction. They are arranged one by one. Each cavity 43 penetrates along the front-rear direction, and the female terminal fitting 71 can be inserted from behind and accommodated therein. The front wall 41 of the female housing 40 has a tab insertion hole 42 that allows the tab portion 32 of the male terminal fitting 31 of the male housing 10 to enter the cavity 43 from the front. The guide surface 42A having a substantially mortar shape is formed over the entire periphery, so that the tab portion 32 can smoothly enter. Of the female housing 40, the block-shaped portion corresponds to the housing body of the present invention.
[0015]
Here, the female terminal fitting 71 will be described. The female terminal fitting 71 is formed by bending a metal plate punched into a predetermined developed shape. 72 and a barrel portion 73 for connection with the electric wire W is disposed on the rear side thereof. The main body 72 has a substantially box shape, and an elastic tongue piece (not shown) that can be bent and deformed is formed inside by folding back, and is elastic with the tab portion 32 of the male terminal fitting 31 that has entered the main body 72. Can be touched. On the other hand, the barrel portion 73 includes a pair of front and rear caulking pieces 73A and 73B facing each other, of which both the front caulking pieces 73A are caulked to the core wire of the electric wire W, while the rear side both The caulking piece 73B is caulked to the covering of the electric wire W.
[0016]
On the other hand, on the front side of the bottom surface of each cavity 43, a lance 44 that is primarily locked to the female terminal fitting 71 is provided. The lance 44 is cantilevered forward, and the tip side can be bent and displaced in the vertical direction. The female terminal fitting 71 is bent and displaced downward as it passes over the lance 44 and returns after passing. Thus, the female terminal fitting 71 functions to prevent the female terminal fitting 71 from coming off.
[0017]
Further, the lower side of the female housing 40 has an opening (hereinafter referred to as a retainer mounting hole 45) in three directions of the lower surface and the left and right side surfaces of the female housing 40, and the female terminal fitting 71 together with the lance described above. A retainer 65 for double locking is attached. The retainer 65 will be briefly described. As shown in FIG. 7, the retainer 65 is made of a synthetic resin material, and is aligned and fitted into the retainer mounting hole 45 as shown in FIG. 7. The board portion 66 is provided with a retaining portion 66 </ b> A for the female terminal fitting 71, which includes a pair of side plates 67 that are formed to project from both ends in the width direction. The retainer 65 has a temporary locking position (see FIG. 7) that allows the insertion of the female terminal fitting 71 into the cavity 43 while the lower surface of the substrate portion 66 protrudes from the lower surface of the female housing 40, and the lower surface of the substrate portion 66. Is displaceable between the main locking position (see FIG. 8) which is substantially flush with the lower surface of the female housing 40. At the main locking position, each retaining portion 66A of the retainer 65 enters the corresponding cavity 43 from below and is locked to the rear edge of the main body 72 of the female terminal fitting 71.
[0018]
As shown in FIG. 5, on the upper surface 40 </ b> A side of the female housing 40, a guide rib 51 for guiding the fitting operation of the female housing 40 to the male housing 10 and both the housings 10, 40 are locked in the fitted state. The lock arms 55 are respectively formed. First, the guide rib 51 is erected over the entire length of the female housing 40 at the left and right side edges of the upper surface 40 </ b> A of the female housing 40. On the other hand, on both left and right edge portions of the ceiling surface 11A of the hood portion 11 of the male housing 10, guide grooves 14 through which the guide ribs 51 can be inserted along the fitting direction of both the housings 10 and 40 are formed. 10 and 40 are guided. The rear end side of the guide rib 51 is thickened to form an overhanging portion 51A. The overhanging portion 51A protrudes outward from the side surface of the female housing 40, and when both the housings 10 and 40 are fitted, it comes into contact with the opening edge 11B of the male housing 10, and together with the restricting portion 62 of the protective wall 61 described later. The above pushing operation is regulated. Further, a connecting rib 52 is formed on the rear portion of the upper surface 40A of the female housing 40 so as to bridge the rear ends of the overhanging portion 51A and the protective wall 61. This is intended to reinforce the female housing 40. It is.
[0019]
The lock arm 55 extends in a rearward direction from the front end portion at the center portion in the width direction of the upper surface 40A and has a cantilever shape having a bending space 54 between the lock arm 55 and the upper surface 40A. More specifically, the lock arm 55 has a pair of arm pieces 56 extending in the front-rear direction (the front end is the base end and the rear end is the free end), and the both arm pieces 56 are connected at a midway position. The connecting portion is thinner than the arm piece 56, and a lock projection 57 is formed to project upward at the center in the length direction. Of the upper surface of the locking projection 57, the front surface side in the fitting direction is an inclined surface 57A having a curvature, and the rear end side is an engaging surface 57B. As shown in FIG. 8, when the two housings 10 and 40 are fitted, the lock arm 55 is deflected downward as it passes through the lock receiving portion 13, and returns after passing. As a result, the rear surface 13A of the lock receiving portion 13 of the male housing 10 faces and is positioned behind the locking surface 57B of the lock protrusion 57, so that the female housing 40 is prevented from being pulled out from the hood portion 11.
[0020]
Further, the upper surfaces of the free end portions of both arm pieces 56 are also connected, and this is an operation portion (corresponding to the operation end of the present invention) 58 for unlocking. The width dimension of the operation portion 58 is formed wider than the outer width dimension of both arm pieces 56, and the arm pieces 56 are connected by a taper. The front end of the operation portion 58 is substantially at the same position as the restriction portion 62 of the protective wall 61 and the front end of the protruding portion 51A of the guide rib 51 in the fitting direction of the housings 10 and 40, and the rear end is the rear end of the connecting rib 52. Located slightly forward.
[0021]
In addition, as shown in FIG. 9, the operation portion 58 is located outside the hood portion 11 even when both the housings 10 and 40 are fitted. Therefore, when both the housings 10 and 40 are in the fitted state, a pressing operation by the operation unit 58 is possible. As a result, the lock arm 55 is elastically displaced into the bending space 54 to lock the lock receiving unit 13 and the lock receiving unit 13. The lock of the protrusion 57 is released. As shown in FIG. 7, the upper surface 40A of the female housing 40 is provided with a step 40a in a step shape at the central portion in the length direction, and becomes lower as it goes rearward. That is, the height of the bending space 54 on the operation portion 58 side of the lock arm 55 is increased, thereby securing a bending allowance for the unlocking operation. In addition, the rear edge of the upper surface of the operation unit 58 is further raised over almost the entire width, but this is the protruding edge 59 when performing the unlocking operation.
[0022]
On the upper surface 40 </ b> A of the female housing 40, a protective wall (corresponding to a side wall portion of the present invention) 61 is erected on the outer side in the width direction of the lock arm 55 in parallel with both arm pieces 56. The front end of the protective wall 61 is substantially at the same position as the front end of the lock arm 55, and the rear end of the protective wall 61 extends slightly rearward from the rear end of the operation portion 58 of the lock arm 55. It is formed over. The rear end side of the protective wall 61 is thickened (hereinafter referred to as a restricting portion 62) in the same manner as the protruding portion 51A of the guide rib 51, and when the housings 10 and 40 are fitted, the opening of the hood portion 11 is opened. It is configured to abut against the edge 11B and restrict further fitting operation.
[0023]
The protective wall 61 is formed with a height that is substantially the same as the height of the arm piece 56 from the front end toward the rear end, and is disposed close to each arm piece 56 in the width direction. The side of the bending space 54 is closed. In such a configuration, if the side of the bending space 54 is open, foreign matter may enter the bending space 54 and the female housing 40 is in a single state. The electric wire W pulled out from the rear end of the housing 40 may accidentally fit into the bending space 54. Therefore, the protective wall 61 is set to prevent the electric wire W from fitting into the bending space 54 and the entry of foreign matter.
[0024]
In addition, the height dimension of the restricting portion 62 of the protective wall 61 is higher than that of other portions, and is formed to have substantially the same height as the protruding edge 59 of the operation portion 58 of the lock arm 55. This is to prevent the operation portion 58 of the lock arm 55 from being inadvertently subjected to external force and being unlocked when both the housings 10 and 40 are in the fitted state. In addition, the rear end surface 62B of the restricting portion 62 extends rearward from the upper end side and is formed with a rearward downward gradient. By adopting such a configuration, the electric wire W and foreign matter approaching the lock arm 55 are moved backward to the female housing 40 to protect the operation portion 58 of the lock arm 55.
[0025]
The rear end of the restricting portion 62 of the protective wall 61 has an inclined shape that is cut out so as to expand from the inner surface side toward the outer surface side, and has a wide portion formed with a wider space between the inner surfaces facing each other than the other portions. 62A is formed. The inclination start end (a portion shown in FIG. 5) of the wide width portion 62 </ b> A is substantially aligned with the front end of the protruding edge 59 of the operation portion 58 with respect to the fitting direction of both the housings 10 and 40. As described above, by widening the width dimension between the restricting portions 62 in the vicinity of the projecting edge 59 of the operating portion 58, the releasing operation of both the housings 10, 40, that is, the pressing operation of the operating portion 58 against the bending space 54 is performed. A release operation space for performing the operation is secured. Note that, in the protective wall 61, a region portion 61A formed with a constant width and having a smaller interval between the opposing surfaces than the wide portion 62A corresponds to the base portion of the present invention.
[0026]
On the other hand, on both the left and right sides of the lock arm receiving groove 12 on the ceiling surface 11A of the hood portion 11 of the male housing 10, there are protective wall insertion grooves 15 through which the protective walls 61 can be inserted along the fitting direction of the two housings 10 and 40. Is formed. Thereby, in addition to the protection function of the lock arm 55 described above, the protection wall 61 has a function of guiding the fitting operation of the female housing 40 to the hood portion 11 together with the guide rib 51. In the present embodiment, the protection unit of the present invention is configured only by the protection wall 61. [0027]
Further, when the two housings 10 and 40 in the fitted state are separated from each other, the lock of the lock arm 55 and the lock receiving portion 13 is released by the operation portion 58 as described above, and then the female housing 40 is released from the hood portion 11. It is necessary to pull out. When performing this pulling-out operation, the lock projection 57 is pushed into the bending space 54 side. At this time, the upper edge of the lock projection 57 (F portion in FIG. 10) and the lock receiving portion 13 If the edge (the lower edge in FIG. 10) interferes in the height direction, the drawer operation cannot be performed well. Therefore, it is necessary to set so that a gap is secured between the lock projection 57 and the lock receiving portion 13 even under the most severe conditions described below. The most severe condition is a state in which the female housing 40 is moved up in the hood portion 11. That is, in order to smoothly insert the female housing 40 between the inner wall of the hood portion 11 and the female housing 40, some gap must be set. Then, the female housing 40 is loosened by the gap, and as shown in FIG. 11, when the female housing 40 moves (moves upward) to the ceiling surface side of the hood portion 11, the lock protrusion 57 and the lock receiving portion 13. The gap is the narrowest.
[0028]
Even in such a case, in order to secure a gap between the lock protrusion 57 and the lock receiving portion 13, the C dimension (dimension obtained by subtracting the B dimension from the A dimension) shown in FIG. Each part (the depth dimension of the protective wall insertion groove 15, the height dimension of the protective wall 61, the height dimension of the lock receiving portion 13, etc.) is set so as to be larger than the D dimension shown in FIG. What is necessary is just to set it as the structure performed by making the bottom face of the protective wall penetration groove | channel 15 and the upper end surface of the protective wall 61 contact | abut. Then, even under the most severe conditions (the state in which the female housing 40 is moved up), a gap between the C dimension and the D dimension is ensured between the lock protrusion 57 and the lock receiving part 13. It will be. The dimension A is the height dimension of the protective wall 61 with respect to the upper surface 40A, and the dimension B is the height from the upper surface 40A to the upper edge of the lock projection 57 when the lock arm 55 is bent. The dimension D is a height dimension from the bottom surface of the protective wall insertion groove 15 to the lower edge of the lock receiving portion 13.
[0029]
Next, the effect of this embodiment is demonstrated concretely.
When fitting both the housings 10 and 40, first, the female housing 40 is directly opposed to the male housing 10. In this state, the guide rib 51, the protective wall 61, and the lock arm 55 of the female housing 40 are positioned to face the guide groove 14, the protective wall insertion groove 15, and the lock arm housing groove 12 on the male housing 10 side, respectively. Therefore, when the female housing 40 is pushed into the opening edge 11 </ b> B of the hood portion 11 and pushed inside, the female housing 40 is inserted into the hood portion 11 while being guided by the guide rib 51 and the protective wall 61.
[0030]
Eventually, the lock projection 57 of the lock arm 55 comes into contact with the lock receiving portion 13 of the male housing 10. When the female housing 40 is further pushed in from this state, the lock arm 55 is guided by the front surface 13B of the lock receiving portion 13 and elastically displaced into the bending space 54, and the female housing 40 enters the hood portion 11. Thereafter, when the lock projection 57 of the lock arm 55 passes through the lock receiving portion 13 of the hood portion 11, the lock arm 55 is elastically restored as shown in FIG. As a result, the lock projection 57 of the lock arm 55 is engaged with the lock receiving portion 13, and the housings 10 and 40 are held in the fitted state. In this fitted state, the tab portion 32 of the male terminal fitting 31 enters the main body 72 of the female terminal fitting 71 and the both terminal fittings 31 and 71 are conductively connected. In this state, the rear end portion of the female housing 40 including the operation portion 58 of the lock arm 55 is in a state of protruding without entering the hood portion 11 of the male housing 10.
[0031]
Next, an operation for releasing the holding of both the housings 10 and 40 will be described.
The holding release is performed by a pressing operation with respect to the operation unit 58 of the female housing 40. That is, if the protrusion 59 of the operation portion 58 is pushed into the upper surface 40A side of the female housing 40, the lock arm 55 is elastically displaced into the bending space 54, so that the lock protrusion 57 and the lock receiving portion 13 are locked. Is solved. When the pushing operation of the protruding edge 59 is performed, the protective wall 61 standing on the side of the lock arm 55 becomes an obstacle, but according to the present embodiment, the restricting portion 62 of the protective wall 61 has a wide width. A portion 62 </ b> A is formed, and the width dimension between the inner walls of both restricting portions 62 is wide in the vicinity of the projecting edge 59 of the operation portion 58.
[0032]
Therefore, a release operation space for performing the pushing operation of the protruding edge 59 (pressing operation of the operation unit 58) is ensured, so that the fingertip of the operator does not interfere with the protective wall 61 and the release operation is smoothly performed. I can do it. Further, the wide portion 62A has an inclined shape and its thickness gradually decreases toward the tip side. Therefore, compared with the case where the entire wide portion 62A is thinned, the strength of the wide portion can be prevented from being lowered, and the clearance with the lock arm 55 can be set to a minimum while securing the release operation space.
[0033]
When the holding of both housings 10 and 40 is released, the rear end side of the female housing 40 is pulled and pulled out from the hood portion 11 of the male housing 10, so that the tab portion 32 of the male terminal fitting 31 becomes the main body of the female terminal fitting 71. In order to retract from the portion 72, the connection between the two terminal fittings 31, 71 is cut off.
[0034]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
[0035]
(1) According to the present embodiment, the wide portion 62A is formed with an inclination, and the space between the opposing surfaces becomes wider toward the rear end side. However, it is only necessary to secure a release operation space. Alternatively, the distance between the opposed surfaces of the wide width portion 62A may be constant.
[0036]
(2) According to the present embodiment, the protection part is formed by the protection wall 61 alone. However, the protection part may be provided with the protection wall 61, for example, in addition to the protection walls 61, the protection part may be protected. The construction may be such that a construction plate for constructing the upper ends of the walls 61 is added and the top surface side of the lock arm is covered.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional view showing a state before fitting both housings in an embodiment of the present invention. FIG. 2 is a plan view of a male housing. FIG. 3 is a side view of a male housing. Front view of housing [Fig. 5] Plan view of female housing [Fig. 6] Side view of female housing [Fig. 7] Cross-sectional view of female housing [Fig. 8] Cross-sectional view showing the fitting state of both housings [Fig. FIG. 10 is a cross-sectional view showing a fitting release operation of both housings. FIG. 11 is a cross-sectional view showing a state in which the female housing moves up and down in the hood.
10 ... Male housing (mating housing)
DESCRIPTION OF SYMBOLS 13 ... Lock receiving part 40 ... Female housing 54 ... Deflection space 55 ... Lock arm 58 ... Operation part 61 ... Protection wall 61A ... Base 62A ... Wide part

Claims (2)

An elastically displaceable cantilever shape having a bending space between a housing body portion that can be fitted to the mating connector housing and an outer surface of the housing body portion, and provided in the mating connector housing A lock arm that can be locked to the lock receiving portion, and a free end of the lock arm is an operation end. By pressing the lock arm, an engagement between the lock arm and the lock receiving portion is established. It is a connector that releases the stop,
On the outer surface side of the connector main body, a pair of rear end positions extending along the lock arm on the outer side in the width direction of the lock arm are substantially equal to or projecting from the operation end of the lock arm. The side wall is formed on the base end side of the lock arm, and the width between the inner surface of the base is provided on the operation end side of the lock arm. A connector comprising a wide portion having a wide interval between opposing inner surfaces. The inner surface of the base is formed to extend straight from one end side to the other end side of the lock arm,
The connector according to claim 1, wherein the wide portion is configured to be inclined so as to expand from an end of an inner surface of the base portion toward an outer surface side of the side wall portion.

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