Locking mechanism and protector

Abstract

The present invention provides a lock mechanism and a protector capable of further improving workability of assembly work of a first member and a second member. A locking groove portion (51) provided in the first protector has a pair of guide rails (514) extending in the locking insertion / extraction direction (Y) and inclined upward from an opening portion (512) to a wall portion (513) in the locking insertion / extraction direction (Y), and a locking protrusion portion (52) provided in the second protector has a pair of members (524) to be guided by the pair of guide rails (514) when inserted into the locking groove portion (51). Each of the pair of members to be guided (524) is inclined upward from the rear end (522) to the front end (521) of the locking protrusion (52).

Description

Technical Field

[0001] The present invention relates to a locking mechanism and a protector. Background Art

[0002] In the past, as a technology related to a locking mechanism for assembling and fixing a first component and a second component, for example, a technology for assembling a first protector (first component) and a second protector (second component) has been disclosed, wherein the first protector has a first wiring material inserted therein along an axial direction, and the second protector is stacked relative to the first protector in a stacking direction intersecting the axial direction and has a second wiring material inserted therein along the axial direction (for example, refer to patent document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-15813 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, in the technology described in Patent Document 1, there is room for further improvement, for example, in terms of improving the workability of the assembly work of the first protector and the second protector.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a locking mechanism and a protector capable of further improving the workability of the assembly work of the first component and the second component.

[0009] Technical solutions to the problem

[0010] In order to achieve the above-mentioned purpose, the locking mechanism involved in the present invention is characterized in that it comprises: a locking groove portion, which is provided in one of the first component and the second component stacked on each other, and is recessed on one side of the stacking direction of the first component and the second component, and the locking groove portion is open on one side of the locking plug-in and pull-out direction intersecting the stacking direction and is closed on the other side; and a locking protrusion portion, which is provided in the other of the first component and the second component, and is protruding on one side of the stacking direction, the locking protrusion is inserted into the locking groove portion through the opening from one side of the locking plug-in and pull-out direction and is locked in the locking groove portion, the locking groove portion has a pair of guide rails, the pair of guide rails extend along the locking plug-in and pull-out direction, and are inclined from one side of the locking plug-in and pull-out direction to the other side to one side of the stacking direction, the locking protrusion has a pair of guided components, the pair of guided components are respectively guided by the pair of guide rails when the locking protrusion is inserted into the locking groove portion, and the pair of guided components are respectively inclined from one side of the locking plug-in and pull-out direction to the other side to one side of the stacking direction.

[0011] In addition, the protector involved in the present invention is characterized in that it comprises: a first component, in which a first wiring material is inserted along the axial direction; a second component, which is stacked relative to the first component in a stacking direction intersecting the axial direction and in which a second wiring material is inserted along the axial direction; and a locking mechanism, which connects the first component and the second component, and the locking mechanism comprises: a locking groove portion, the locking groove portion is provided in one of the first component and the second component stacked on each other, and is recessed toward one side in the stacking direction, and the locking groove portion is open on one side in the locking insertion and removal direction intersecting the stacking direction and the other side The locking protrusion is provided on the other of the first component and the second component, and is protrudingly provided to one side of the stacking direction, and is inserted into the locking groove through the opening from one side of the locking plug-in and pull-out direction and is locked in the locking groove, the locking groove has a pair of guide rails, the pair of guide rails extend along the locking plug-in and pull-out direction, and are inclined to one side of the stacking direction from one side to the other side of the locking plug-in and pull-out direction, the locking protrusion has a pair of guided parts, the pair of guided parts are respectively guided by the pair of guide rails when the locking protrusion is inserted into the locking groove, and the pair of guided parts are respectively inclined to one side of the stacking direction from one side to the other side of the locking plug-in and pull-out direction.

[0012] Effects of the Invention

[0013] The locking mechanism and protector of the present invention can form a larger amount of introduction between the guide rail and the top wall on the side of the locking groove that becomes the insertion port, making it easy to insert the locking protrusion into the locking groove. Therefore, when assembling the first component and the second component, it is possible to suppress poor insertion of the locking protrusion into the locking groove and prevent incomplete connection. As a result, the workability of the assembly operation of the first component and the second component can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a wire harness to which the protector according to the present embodiment is applied.

[0015] Figure 2 It is a partially enlarged perspective view showing the vicinity of a locking groove portion which constitutes a part of the locking mechanism and is provided in the first protector.

[0016] Figure 3 It is a partially enlarged perspective view showing the vicinity of a locking protrusion that constitutes a part of the locking mechanism and is provided in the second protector.

[0017] Figure 4 This is a partially enlarged perspective view for explaining the operation when the locking protrusion is inserted into the locking groove.

[0018] Figure 5It is a partial cross-sectional view showing a state before the locking protrusion is inserted into the locking groove portion, cut along the locking insertion and removal direction at the position of the guide rail of the locking groove portion.

[0019] Figure 6 It is a partial cross-sectional view showing a state where the locking protrusion is inserted into the locking groove, cut along the locking insertion and extraction direction at the position of the locking portion of the locking protrusion.

[0020] Description of Reference Numerals

[0021] 1 Protector

[0022] 2First protector (first component)

[0023] 3. Second protector (second component)

[0024] 5 Locking mechanism

[0025] 10 Base

[0026] 11 bottom wall

[0027] 20 Upper cover

[0028] 30 Lower housing

[0029] 40 Upper shell

[0030] 41 upper wall

[0031] 51 locking groove

[0032] 52 locking protrusion

[0033] 512 Opening

[0034] 514 Guide Rail

[0035] 515 Protrusion

[0036] 521 Front end

[0037] 522 rear end

[0038] 524 Guided Components

[0039] 526 stopper

[0040] L gap (introduction amount)

[0041] W Wiring Materials

[0042] W1 First wiring material

[0043] W2 Second wiring material

[0044] WH Harness

[0045] X axis direction

[0046] Y-cage plug-in and pull-out direction

[0047] Z stacking direction DETAILED DESCRIPTION

[0048] Hereinafter, the embodiments of the present invention will be described in detail based on the accompanying drawings. In addition, the present invention is not limited to the present embodiment. In addition, the constituent elements in the present embodiment include elements that can be easily replaced by those skilled in the art or substantially the same elements. In addition, in this specification, ordinal numbers are only used to distinguish parts, components, parts, positions, directions, etc., and do not indicate order or priority.

[0049] Figure 1 It is a perspective view of a wire harness to which the protector according to the present embodiment is applied. Figure 1 The protector 1 shown is assembled in a wire harness WH wired in a vehicle or the like. Here, the wire harness WH is a collection of a plurality of wiring materials W used for power supply and signal communication, for example, for connection between various devices mounted on the vehicle, and the plurality of wiring materials W are connected to the various devices via a connector or the like. The wire harness WH of this embodiment includes: a plurality of wiring materials W having conductivity and a protector 1 mounted on the plurality of wiring materials W to protect the wiring materials W. In addition, the wire harness WH may be configured to include various components such as a corrugated tube, a grommet, an electrical connection box, a fixing, and a connector.

[0050] In addition, in the following description, the first direction among the mutually intersecting first direction, second direction and third direction is referred to as "axial direction X", the second direction is referred to as "locking plugging direction Y", and the third direction is referred to as "stacking direction Z". Here, the axial direction X, the locking plugging direction Y and the stacking direction Z are substantially orthogonal to each other. The axial direction X is typically equivalent to the insertion direction of the wiring material W relative to the protector 1, the extension direction of the protector 1 and the wiring material W inserted into the protector 1. The stacking direction Z is typically equivalent to the stacking direction of the first protector (first component) 2 and the second protector (second component) 3 described later in the protector 1, and is substantially parallel to the vehicle height direction. The locking plugging direction Y is typically equivalent to the direction in which the first protector 2 and the second protector 3 in the protector 1 are plugged and unplugged from each other, and is substantially parallel to the width direction of the first protector 2 and the second protector 3. In addition, unless otherwise specified, the directions used in the following description are described in terms of the directions in the state where the wiring material W is assembled in the protector 1.

[0051] The wiring material W is composed of, for example, a metal rod, an electric wire, a bundle of electric wires, etc. The metal rod is formed by covering the outer side of a rod-shaped member having conductivity with an insulating covering portion. The electric wire is formed by covering the outer side of a conductor portion (core wire) composed of a plurality of conductive metal wires with an insulating covering portion. The bundle of electric wires is formed by bundling the electric wires. The wiring material W of the present embodiment includes a first wiring material W1 and a second wiring material W2. Here, the first wiring material W1 and the second wiring material W2 are formed into a substantially circular cross-sectional shape, and are described as having substantially the same outer diameter and shape, but are not limited thereto. The first wiring material W1 is, for example, a high-voltage electric wire, and the second wiring material W2 is, for example, a low-voltage electric wire.

[0052] The protector 1 includes a first protector 2 , a second protector 3 , and a lock mechanism 5 that couples and fixes the first protector 2 and the second protector 3 .

[0053] The first protector 2 is formed in a generally cylindrical shape and is mounted on a vehicle. The first protector 2 has an insertion space 2a extending in the axial direction X, protects the first wiring material W1 inserted in the insertion space 2a, and restricts the wiring path of the first wiring material W1.

[0054] The second protector 3 is formed as a whole in a substantially cylindrical shape smaller than the first protector 2, and is mounted on the first protector 2 via a locking mechanism 5. The second protector 3 is provided with an insertion space 3a extending along the axial direction X, and protects the second wiring material W2 inserted through the insertion space 3a and restricts the wiring path of the second wiring material W2.

[0055] The first protector 2 is, for example, configured to include a base 10 and an upper cover 20 formed of a resin material or the like, and the base 10 and the upper cover 20 are assembled to each other so as to form a generally rectangular cylindrical shape as a whole. The base 10 has a bottom wall 11 and a pair of side walls 12, and a cross section intersecting the axial direction X is formed into a generally U-shape. The bottom wall 11 is, for example, formed into an arc shape along the first wiring material W1, and extends along the axial direction X. The pair of side walls 12 extend from both ends of the bottom wall 11 in the locking plug-in direction Y to one side in the stacking direction Z (at Figure 1 The bottom wall 11 and the pair of side walls 12 of the base 10 are formed in an integral manner, and a space surrounded by the bottom wall 11 and the pair of side walls 12 functions as the above-mentioned insertion space 2a.

[0056] The upper cover 20 is assembled to the base 10, and covers (closes) the insertion space 2a of the base 10. The upper cover 20 has an upper wall 21 and a pair of side walls 22, and the cross section intersecting the axial direction X is formed into a substantially U-shaped shape. The upper wall 21 is formed into a flat plate shape, for example, and extends along the axial direction X. The pair of side walls 22 extend from both ends of the upper wall 21 in the locking insertion and removal direction Y to the other side in the stacking direction Z (at the Figure 1 The upper cover 20 is formed to protrude from an upper wall 21 and a pair of side walls 22 and cooperates with the base 10 to partition the insertion space 2a from the outside.

[0057] The second protector 3 is, for example, configured to include a lower shell 30 and an upper shell 40 formed of a resin material or the like, and by assembling the lower shell 30 and the upper shell 40 to each other, the second protector 3 is formed as a whole into a substantially rectangular cylindrical shape. The lower shell 30 has a lower wall 31 and a pair of side walls 32, so that the cross section intersecting the axial direction X is formed into a substantially U-shape. The lower wall 31 is, for example, formed in a flat plate shape and extends along the axial direction X. A pair of side walls 32 are formed protruding from both ends of the locking plug-in and pull-out direction Y of the lower wall 31 to one side of the stacking direction Z, and extend along the axial direction X. The lower shell 30 is formed integrally by the lower wall 31 and the pair of side walls 32, and the space portion surrounded by the lower wall 31 and the pair of side walls 32 functions as the above-mentioned insertion space portion 3a.

[0058] The upper shell 40 is assembled to the lower shell 30, and covers (closes) the insertion space 3a in the lower shell 30. The upper shell 40 has an upper wall 41 and a pair of side walls 42, so that the cross section intersecting the axial direction X is formed into a substantially U-shape. The upper wall 41 is formed in a flat plate shape, for example, and extends along the axial direction X. The pair of side walls 42 are formed protruding from both ends of the upper wall 41 in the locking insertion and removal direction Y to the other side of the stacking direction Z, and extend along the axial direction X. The upper shell 40 is formed integrally by the upper wall 41 and the pair of side walls 42, and cooperates with the above-mentioned lower shell 30 to divide the above-mentioned insertion space 3a from the outside.

[0059] Next, the locking mechanism 5 will be described. Figure 2 It is a partially enlarged perspective view of a portion of the locking mechanism provided near the locking groove portion of the first protector. Figure 3 It is a partially enlarged perspective view of the vicinity of the locking protrusion that constitutes a part of the locking mechanism and is provided in the second protector. Figure 4 This is a partially enlarged perspective view for explaining the operation when the locking protrusion is inserted into the locking groove. Figure 5 It is a partial cross-sectional view taken along the locking insertion and removal direction at the position of the guide rail of the locking groove in a state before the locking protrusion is inserted into the locking groove. Figure 61 is a partial cross-sectional view cut along the locking insertion and removal direction at the position of the locking portion of the locking protrusion after the locking protrusion is inserted into the locking groove. The locking mechanism 5 is a part that connects and fixes the first protector 2 and the second protector 3, and as shown in FIG. Figure 2 and Figure 3 As shown, the locking mechanism 5 includes a locking groove 51 and a locking protrusion 52. In the present embodiment, the locking groove 51 is provided on the bottom wall 11 of the base 10 of the first protector 2, and the locking protrusion 52 is provided on the upper wall 41 of the upper shell 40 of the second protector 3. In addition, the locking mechanism 5 is not limited to the above structure, and the locking groove 51 may be provided on the upper wall 41, and the locking protrusion 52 may be provided on the bottom wall 11.

[0060] The locking groove 51 is a portion into which the locking projection 52 is inserted and fixed when the first protector 2 and the second protector 3 are assembled. Figure 2 As shown, the locking groove 51 is formed by moving the bottom wall 11 of the base 10 of the first protector 2 toward one side in the stacking direction Z (in Figure 2 In the example, the upper side) is recessed. The locking groove portion 51 includes: a top wall 510, which is located on the side of the stacking direction Z relative to the bottom wall 11; and a pair of side wall portions 511, which are located on both sides of the axial direction X and connect the top wall 510 and the bottom wall 11. These top wall 510 and side wall portions 511 extend along the locking plug-in direction Y, respectively, so that the locking groove portion 51 is formed as a groove portion extending along the locking plug-in direction Y. In addition, the locking groove portion 51 includes a side facing the locking plug-in direction Y (in the example, the upper side). Figure 2 The opening 512 is provided with a locking member having the other side (in the near front side) of the insertion and removal direction Y. Figure 2 In the example of the embodiment of the present invention, the wall portion 513 is closed on the deep side. When the locking protrusion 52 is inserted into the locking groove 51, the wall portion 513 faces the front end portion 521 of the locking protrusion 52 described later in the locking insertion and extraction direction Y.

[0061] In addition, the locking groove portion 51 has a pair of guide rails 514 protruding opposite to each other in the axial direction X on the pair of side wall portions 511. The guide rails 514 are components that support and guide the guided component 524 described later of the locking protrusion 52 when the locking protrusion 52 is inserted into the locking groove portion 51. The guide rails 514 extend along the locking plug-in and pull-out direction Y, and are inclined toward one side of the stacking direction from one side of the locking plug-in and pull-out direction Y to the other side. Specifically, the guide rails 514 are formed to incline upward from the opening portion 512 of the locking groove portion 51 to the wall portion 513. In this structure, as Figure 4 and Figure 5 As shown, in the opening 512 serving as the insertion port, the gap (introduction amount) L between the guide rail 514 and the top wall 510 can be formed to be large, so that the locking protrusion 52 can be easily inserted into the locking groove 51 .

[0062] In addition, the locking groove 51 has a protrusion 515 on one side of the locking insertion and extraction direction Y of the top wall 510 and protrudes toward the other side of the stacking direction Z. Specifically, Figure 4 and Figure 6 As shown in the figure, the locking groove 51 has a protrusion 515 protruding downward on the side of the opening 512 of the top wall 510. The protrusion 515 is a portion that is locked with a locking portion 526 of the locking protrusion 52 described later when the locking protrusion 52 is inserted into the locking groove 51. The locking portion 526 of the locking protrusion 52 is locked with the protrusion 515 in the locking insertion and extraction direction Y, so that the locking protrusion 52 is fixed in the locking groove 51.

[0063] On the other hand, the locking protrusion 52 is a portion that is inserted into and fixed to the locking groove 51 on the first protector 2 side. Figure 3 As shown, the locking protrusion 52 includes a base 520 formed by protruding from the upper wall 41 of the upper shell 40 of the second protector 3 to one side (upper) of the stacking direction Z, and the base 520 is formed in a substantially square shape and extends along the locking plugging and unplugging direction Y. The locking protrusion 52 includes: a front end portion 521, which is located on the other side of the locking plugging and unplugging direction Y of the base 520; a rear end portion 522, which is located on one side of the locking plugging and unplugging direction Y; and a pair of side wall portions 523, which are located on both sides of the axial direction X of the base 520 and connect the front end portion 521 and the rear end portion 522.

[0064] The front end portion 521 is a portion that becomes the front end when the locking protrusion 52 is inserted into the locking groove 51 along the locking insertion and extraction direction Y, and is opposed to the wall portion 513 of the locking groove 51. The pair of side wall portions 523 are portions that are opposed to the pair of side wall portions 511 when the locking protrusion 52 is inserted into the locking groove 51.

[0065] The locking protrusion 52 includes a pair of guided members 524 protruding in a manner separated from each other in the axial direction X on the pair of side wall portions 523. Figure 4 as well as Figure 5 As shown, the guided member 524 is a member guided by the guide rail 514 of the locking groove 51 when the locking protrusion 52 is inserted into the locking groove 51 , and is opposed to the guide rail 514 on one side of the stacking direction Z. That is, the guided member 524 is located above the guide rail 514 and is opposed to the guide rail 514 .

[0066] The guided member 524 extends along the locking insertion and extraction direction Y, and is provided to be inclined toward one side of the stacking direction from one side to the other side of the locking insertion and extraction direction Y. Specifically, the guided member 524 is formed to be inclined upward from the rear end portion 522 to the front end portion 521 of the locking protrusion 52. The guided member 524 and the guide rail 514 are formed to have substantially the same inclination angle, and the locking protrusion 52 can be easily attached and detached (inserted and pulled out) along the locking groove portion 51 by sliding the guided member 524 on the guide rail 514.

[0067] In addition, the locking protrusion 52 has a locking portion 526, which abuts against the protrusion 515 provided on the top wall 510 of the locking groove 51 when the locking protrusion 52 is inserted into the locking groove 51, and is locked in the locking insertion and extraction direction Y. Specifically, Figure 3 and Figure 6 As shown, the locking protrusion 52 has an arm portion 525 which is arranged opposite to the top wall 510 of the locking groove portion 51 when the locking protrusion 52 is inserted into the locking groove portion 51. The arm portion 525 is arranged so that the front end portion 521 side (the other side of the locking plug-in and pull-out direction Y) of the locking protrusion 52 becomes a fixed end, and the rear end portion 522 side (one side of the locking plug-in and pull-out direction Y) becomes a free end. The locking portion 526 is provided on the free end side of the arm portion 525 to protrude toward one side (upper) of the stacking direction Z. If the locking protrusion 52 is inserted into the locking groove portion 51, the locking portion 526 abuts against the protrusion 515 provided on the top wall 510 of the locking groove portion 51, so that the arm portion 525 is bent toward the other side (lower) of the stacking direction Z, thereby being pressed against the guide rail 514 by the guide component 524. Furthermore, if the locking protrusion 52 is further inserted, as shown in Figure 6 As shown, the locking portion 526 goes over the protruding portion 515 , and the locking portion 526 and the protruding portion 515 are locked in the locking insertion and extraction direction Y, so that the locking protrusion 52 is fixed to the locking groove 51 .

[0068] In the locking mechanism 5 configured as described above, the locking projection 52 is locked to the locking groove 51 from one side of the locking insertion and extraction direction Y. Figure 4 and Figure 5As shown, a pair of guide rails 514 of the retaining groove 51 is formed to be inclined upward from the opening 512 of the retaining groove 51 to the wall 513. Therefore, in the opening 512 that becomes the insertion port, a larger gap L (introduction amount) between the guide rail 514 and the top wall can be formed, and the retaining protrusion 52 can be easily inserted into the retaining groove 51. Therefore, when the first protector 2 and the second protector 3 are connected, the poor insertion of the retaining protrusion 52 relative to the retaining groove 51 can be suppressed, and incomplete connection (poor fitting) can be prevented. As a result, in the protector 1, the operability of the assembly operation of the first protector 2 and the second protector 3 can be further improved. For example, even if the operator does not visually check the locking mechanism 5, the first protector 2 and the second protector 3 can be easily assembled.

[0069] As described above, in the locking mechanism 5 and the protector 1 of the present embodiment, the locking groove 51 provided in the first protector 2 has a pair of guide rails 514 extending along the locking insertion and removal direction Y and tilted upward from the opening 512 to the wall 513 in the locking insertion and removal direction Y, and the locking protrusion 52 provided in the second protector 3 has a pair of guided members 524 respectively guided by the pair of guide rails 514 when inserted into the locking groove 51, and the pair of guided members 524 tilted upward from the rear end 522 to the front end 521 of the locking protrusion 52. Therefore, in the opening 512 serving as the insertion port, a large gap L (introduction amount) between the guide rails 514 and the top wall can be formed, and the locking protrusion 52 can be easily inserted into the locking groove 51. Therefore, when the first protector 2 and the second protector 3 are assembled, poor insertion of the locking protrusion 52 with respect to the locking groove 51 can be suppressed, and incomplete connection (poor fitting) can be prevented. As a result, in the protector 1 , the workability of the assembling operation of the first protector 2 and the second protector 3 can be further improved.

[0070] The above examples illustrate the embodiments of the present invention, but the above embodiments are only examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other ways, and various omissions, substitutions, combinations, and changes can be made without departing from the scope of the main purpose of the invention. In addition, the specifications of various structures, shapes, etc. (structure, type, direction, form, size, length, width, thickness, height, quantity, configuration, position, material, etc.) can be appropriately changed for implementation.

[0071] Furthermore, in the above-described embodiment, as the first and second members to which the locking mechanism 5 is applied, the first protector 2 and the second protector 3 that respectively protect the wiring material W are exemplified and described, but the present invention is not limited thereto.

Claims

1. A locking mechanism, characterized in that: have: A locking groove portion, the locking groove portion being provided in one of the first component and the second component stacked on each other and being recessed toward one side of the stacking direction of the first component and the second component, the locking groove portion being open on one side of the locking insertion and extraction direction intersecting the stacking direction and being closed on the other side; and a locking protrusion, the locking protrusion being provided on the other of the first component and the second component and being provided protrudingly toward the one side in the stacking direction, the locking protrusion being inserted into the locking groove through the opening from the one side in the locking insertion and removal direction and being locked in the locking groove, The locking groove portion has a pair of guide rails, which extend along the locking plug-in and pull-out direction and are inclined toward the one side of the stacking direction from the one side to the other side in the locking plug-in and pull-out direction, and the locking protrusion has a pair of guided components, which are respectively guided by the pair of guide rails when the locking protrusion is inserted into the locking groove portion, and the pair of guided components are respectively inclined toward the one side of the stacking direction from the one side to the other side in the locking plug-in and pull-out direction.

2. A protector, characterized in that: have: a first component, wherein a first wiring material is inserted into the first component along the axial direction; a second member which is stacked with respect to the first member in a stacking direction intersecting the axial direction and in which a second wiring material is inserted along the axial direction; and a locking mechanism that couples the first component to the second component, The locking mechanism comprises: a locking groove portion, the locking groove portion being provided in one of the first component and the second component stacked on each other and being recessed toward one side in the stacking direction, the locking groove portion being open on one side in a locking insertion and removal direction intersecting the stacking direction and being closed on the other side; and a locking protrusion, the locking protrusion being provided on the other of the first component and the second component and being provided protrudingly toward the one side in the stacking direction, being inserted into the locking groove through the opening from the one side in the locking insertion and removal direction and being locked in the locking groove, The locking groove portion has a pair of guide rails, which extend along the locking plug-in and pull-out direction and are inclined toward the one side of the stacking direction from the one side to the other side in the locking plug-in and pull-out direction, and the locking protrusion has a pair of guided components, which are respectively guided by the pair of guide rails when the locking protrusion is inserted into the locking groove portion, and the pair of guided components are respectively inclined toward the one side of the stacking direction from the one side to the other side in the locking plug-in and pull-out direction.

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