Multifunctional folding tool

Abstract

The utility model provides a multifunctional folding tool. The multifunctional folding tool comprises a tool body, the tool body is provided with a containing space and a containing channel communicated with the containing space, the containing space can be opened and closed, and the containing channel extends to the end of the tool body and penetrates through the end of the tool body; the key ring comprises a hanging part and a pushing part connected with the hanging part, a key hole used for hanging a key is formed in the hanging part, the key ring is movably arranged in the storage channel in the first direction, the key ring is pushed to the storage position, the pushing part is located in the containing space, and the hanging part is stored in the storage channel; when the key ring is pushed to the using position, the hanging part extends out of the containing channel, and the pushing part is located in the containing space or the containing channel. According to the technical scheme, the problem that in the prior art, a multifunctional folding tool is poor in user experience feeling is solved.

Description

Technical Field

[0001] This utility model relates to the field of manual tool technology, and more specifically, to a multifunctional folding tool. Background Technology

[0002] A multi-functional folding tool is a tool that integrates multiple functions and is mainly used in scenarios such as repair and outdoor activities. In the existing technology, most multi-functional folding tools include a keychain for hanging keys. However, the keychain is exposed and fixed to the end of the multi-functional folding tool. It is difficult for users to choose whether to use the keychain function according to their personal needs or usage environment. For users who do not need to use the keychain, the exposed keychain may affect the overall appearance and grip of the multi-functional folding tool, resulting in a poor user experience. Utility Model Content

[0003] The main purpose of this utility model is to provide a multi-functional folding tool to solve the problem of poor user experience of existing multi-functional folding tools.

[0004] To achieve the above objectives, this utility model provides a multi-functional folding tool. The multi-functional folding tool includes: a tool body having a accommodating space and a storage channel communicating with the accommodating space; the accommodating space is closable; the storage channel extends to and passes through the end of the tool body; and a keychain including a hanging part and a pushing part connected to the hanging part. The hanging part has a keyhole for hanging a key; the keychain is movably disposed in the storage channel along a first direction. When the keychain is pushed to the storage position, the pushing part is located in the accommodating space, and the hanging part is stored in the storage channel. When the keychain is pushed to the use position, the hanging part extends out of the storage channel, and the pushing part is located in either the accommodating space or the storage channel.

[0005] Furthermore, along the first direction, the suspension part and the pushing part are arranged opposite to each other. When the key fob is in the storage position, the pushing part is located in the receiving space, and when the key fob is in the use position, the pushing part is located in the storage channel.

[0006] Furthermore, along the second direction, at least one side of the key fob is connected to a damping element, which is located between the inner wall of the storage channel and the key fob. The damping element abuts against the inner wall of the storage channel, and the second direction and the first direction are arranged at an angle.

[0007] Furthermore, the damping member extends along the first direction and includes a floating portion and a connecting portion disposed opposite to each other. The floating portion is disposed buoyantly relative to the connecting portion and is located on the side of the connecting portion opposite to the keyhole.

[0008] Furthermore, the damping element is a plate-shaped structure made of elastic material, and the thickness of the damping element gradually decreases from the pushing part to the suspension part along the first direction.

[0009] Furthermore, the multi-functional folding tool also includes a limiting component, which is set in the storage channel and connected to the inner wall of the storage channel. The key buckle is provided with a guide part, which extends along a first direction, and the guide part and the limiting component slide together.

[0010] Furthermore, the guide part is an elongated hole, and the limiting member is a limiting shaft passing through the elongated hole, with the limiting shaft slidingly engaging with the elongated hole.

[0011] Furthermore, the tool body includes: two handles rotatably connected, each handle having a receiving groove; and a mounting component, one of the receiving grooves containing the mounting component, the mounting component including two frames arranged at intervals along a second direction, the two frames forming a storage channel between them.

[0012] Furthermore, the frame includes a first base bone and a second base bone that are connected and arranged at an angle, the key ring is located between the two second base bones, and at least one of the first base bone and the second base bone is connected to the corresponding handle.

[0013] Furthermore, along a third direction, the second base includes a first plate segment and a second plate segment connected together. The cross-sectional area of ​​the first plate segment is larger than that of the second plate segment. A stepped surface is formed between the first plate segment and the second plate segment. The opposing sides of the two second plate segments and the two stepped surfaces enclose a storage channel.

[0014] By applying the technical solution of this utility model, when the user is not using the keychain, they can push the keychain in the first direction so that the pushing part of the keychain is located in the receiving space and the hanging part is located in the storage channel. In this way, compared with the prior art where the keychain is exposed and fixed to the end of the tool body, this utility model can move the hanging part into the storage channel to avoid the keychain protruding from the tool body, thereby avoiding the phenomenon of affecting the overall appearance and grip of the multi-functional folding tool, and improving the user experience. When the user needs to use the keychain, they can open the receiving space and push the keychain in the first direction to switch the keychain from the storage position to the use position. The hanging part extends out of the storage channel through the end of the tool body, and the keyhole of the hanging part can be used to hang the key. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A structural schematic diagram of an embodiment of the multifunctional folding tool of the present invention is shown (wherein the key ring is in the storage position);

[0017] Figure 2 It shows Figure 1 A magnified view of part AA of the multi-functional folding tool;

[0018] Figure 3 It shows Figure 1 A structural diagram of a multi-functional folding tool (with the key ring in the usage position);

[0019] Figure 4 It shows Figure 3 A magnified view of the BB section of the multi-functional folding tool;

[0020] Figure 5 It shows Figure 1 A structural diagram of the skeleton, key ring, and limiting components of a multi-functional folding tool;

[0021] Figure 6 It shows Figure 5 A structural diagram of a multi-functional folding tool from another perspective;

[0022] Figure 7 It shows Figure 6 A magnified view of the CC section of the multi-functional folding tool;

[0023] Figure 8 It shows Figure 1 A schematic diagram of the structure of a keychain for a multi-functional folding tool;

[0024] Figure 9 It shows Figure 1 A structural diagram of the skeleton and limiting components of a multi-functional folding tool.

[0025] The above figures include the following reference numerals:

[0026] 100. Tool body; 10. Handle; 21. Key buckle; 210. Keyhole; 211. Guide part; 212. Suspension part; 213. Pushing part; 214. Mounting hole; 215. Protrusion; 22. Damping component; 221. Connecting part; 222. Floating part; 23. Limiting component; 24. Frame; 241. First base; 242. Second base; 2421. First plate segment; 2422. Second plate segment; 243. Step surface; 244. Second through hole; 30. Pliers head. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, in the embodiments of this utility model, such as Figure 1 As shown, the first direction, the second direction, and the third direction are arranged at an angle to each other. Preferably, the first direction, the second direction, and the third direction are arranged perpendicular to each other. The first direction is the length direction of the handle 10, the second direction is the width direction of the handle, and the third direction is the height direction of the handle 10.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, an embodiment of this utility model provides a multi-functional folding tool. The multi-functional folding tool includes a tool body 100, having an accommodating space and a storage channel communicating with the accommodating space. The accommodating space is closable, and the storage channel extends to and passes through the end of the tool body 100. A key buckle 21 includes a hanging part 212 and a pushing part 213 connected to the hanging part 212. The hanging part 212 has a keyhole 210 for hanging a key. The key buckle 21 is movably disposed in the storage channel along a first direction. When the key buckle 21 is pushed to the storage position, the pushing part 213 is located in the accommodating space, and the hanging part 212 is stored in the storage channel. When the key buckle 21 is pushed to the use position, the hanging part 212 extends out of the storage channel, and the pushing part 213 is located in either the accommodating space or the storage channel.

[0030] In the above technical solution, when the user is not using the keychain 21, the keychain 21 is pushed along the first direction so that the pushing part 213 of the keychain is located in the accommodating space and the hanging part 212 is located in the storage channel. In this way, compared with the prior art in which the keychain 21 is exposed and fixed to the end of the tool body 100, in this utility model, the hanging part 212 can be moved into the storage channel to avoid the keychain 21 protruding from the tool body 100, thereby avoiding the phenomenon of affecting the overall appearance and grip of the multi-functional folding tool, and improving the user experience. When the user needs to use the keychain 21, the accommodating space is opened and the keychain 21 is pushed along the first direction so that the keychain 21 is switched from the storage position to the use position. The hanging part 212 extends out of the storage channel through the end of the tool body 100, and the keyhole 210 of the hanging part 212 can hang the key.

[0031] Specifically, in the embodiments of this utility model, by movably setting the key buckle 21 in the storage channel, the user can choose whether to use the key buckle 21 according to actual needs, thereby avoiding the inconvenience of holding the multi-functional folding tool when the key buckle 21 is not used, and improving the overall user experience of the multi-functional folding tool.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown in the embodiment of this utility model, along the first direction, the hanging part 212 and the pushing part 213 are arranged opposite to each other. When the key buckle 21 is in the storage position, the pushing part 213 is located in the accommodating space. When the key buckle 21 is in the use position, the pushing part 213 is located in the storage channel.

[0033] In the above technical solution, when the user is not using the keychain 21, pushing the hanging part 212 puts the keychain 21 in the storage position, and simultaneously pushing the pushing part 213 from the storage channel into the receiving space; when the user needs to use the keychain 21, pushing the hanging part 212 pushes the pushing part 213 into the storage channel and makes the hanging part 212 protrude from the end of the tool body 100, so that the keyhole 210 can suspend the key. Specifically, in the embodiments of this utility model, along the first direction, the keychain 21 has two oppositely arranged ends, one end of the keychain 21 forms the pushing part 213, and the other end of the keychain 21 forms the hanging part 212. In one embodiment, the pushing part 213 can also be an operating lever, which extends along a third direction and is located within the receiving space. By operating the operating lever along the first direction, the keychain 21 can be switched between the storage position and the use position.

[0034] like Figures 1 to 5 , Figure 7 and Figure 8 As shown in the embodiment of this utility model, along the second direction, at least one side of the key buckle 21 is connected to a damping member 22. The damping member 22 is located between the inner wall of the storage channel and the key buckle 21. The damping member 22 abuts against the inner wall of the storage channel. The second direction and the first direction are set at an angle.

[0035] In the above technical solution, by providing a damping element 22 on at least one side of the key buckle 21, and generating frictional damping between the damping element 22 and the inner wall of the storage channel, the key buckle 21 will not loosen or fall out at will, thereby achieving the purpose of hiding. In this way, when the key buckle 21 is in the storage position, the key buckle 21 will not loosen or even fall out.

[0036] Specifically, in the embodiments of this utility model, when the user is performing other functions, the friction force generated by the damping element 22 can also reduce the shaking and vibration of the key buckle 21 during use, thereby improving the overall stability of the multi-functional folding tool.

[0037] Specifically, in the embodiments of this utility model, the key buckle 21 is provided with a damping member 22 on at least one side in the second direction, and the second direction is set at an angle to the first direction. In this way, the damping member 22 can be located between the inner wall of the storage channel and the key buckle 21 to generate damping.

[0038] Preferably, in the embodiment of this utility model, damping elements 22 are provided on both sides of the key buckle 21 along the second direction, which can further improve the overall stability of the multi-functional folding tool.

[0039] like Figure 2 , Figure 5 , Figure 7 and Figure 8 As shown in the embodiment of this utility model, the damping member 22 extends along a first direction. The damping member 22 includes a floating part 222 and a connecting part 221 disposed opposite to each other. The floating part 222 is buoyantly disposed relative to the connecting part 221, and the floating part is located on the side of the connecting part opposite to the keyhole 210. In the above technical solution, frictional damping can be generated between the floating part 222 and the inner wall of the storage channel. The floating part 222 can provide damping for the key buckle 21, so that when the key buckle 21 is in the use position or the storage position, the key buckle 21 will not move easily, thereby avoiding the phenomenon of the key buckle 21 becoming loose.

[0040] like Figure 2 , Figure 5 , Figure 7 and Figure 8 As shown in the embodiment of this utility model, the floating part 222 is made of elastic material, and the thickness of the damping member 22 gradually decreases from the storage position to the use position along the first direction.

[0041] In the above technical solution, the damping component 22 made of elastic material can automatically adjust its damping effect according to the contact pressure and deformation. This adaptability allows the key buckle 21 to obtain a suitable damping force when moving between the use position and the storage position.

[0042] Preferably, in the embodiments of this utility model, the damping element 22 is a spring sheet, and the key buckle 21 is provided with a mounting hole 214, and the spring sheet is connected to the inner wall surface of the mounting hole 214.

[0043] It should be noted that in the embodiments of this utility model, the thickness of the damping member 22 refers to the dimension of the damping member 22 in the second direction, that is, the thickness direction of the damping member 22 is in the same direction as the thickness direction of the key buckle 21. In other words, the thickness of the damping member 22 refers to the distance between the surface of the damping member 22 facing away from the key buckle 21 and the inner wall of the mounting hole 214 of the key buckle 21.

[0044] In one embodiment, the mounting hole 214 may be omitted, and the spring piece may be directly connected to the key ring 21.

[0045] like Figures 1 to 5 , Figure 7 and Figure 8As shown in the embodiment of this utility model, the multifunctional folding tool also includes a limiting member 23, which is disposed in the storage channel and connected to the inner wall of the storage channel. The key buckle 21 is provided with a guide part 211, which extends along the first direction and slides in cooperation with the limiting member 23.

[0046] In the above technical solution, by setting a sliding fit limiting member 23 and a guide part 211, the movement path of the key buckle 21 along the first direction is limited, thereby improving the positioning accuracy of the key buckle 21 in the storage position and the use position, and improving the stability and reliability of the user when operating the key buckle 21.

[0047] like Figure 2 , Figure 4 , Figures 5 to 9 As shown in the embodiment of this utility model, the guide part 211 is an elongated hole, and the limiting member is a limiting shaft passing through the elongated hole, with the limiting shaft slidingly engaging with the elongated hole.

[0048] In the above technical solution, the sliding fit between the limiting shaft and the elongated hole provides guidance for the key buckle 21, ensuring that the movement trajectory of the key buckle 21 along the first direction in the storage channel is fixed. This avoids the phenomenon of the key buckle 21 shifting or shaking during operation.

[0049] Specifically, in the embodiments of this utility model, the elongated hole and the keyhole 210 are connected. From the elongated hole to the keyhole 210, a protrusion 215 is provided at the connection between the elongated hole and the keyhole 210. The protrusion 215 extends in a third direction and can limit the stroke of the limiting shaft to prevent the limiting shaft from coming out of the guide part 211.

[0050] In one embodiment, the elongated hole and the keyhole 210 are not connected, so there is no need to provide the protrusion 215.

[0051] Specifically, in the embodiments of this utility model, the limiting shaft is a pin, and the limiting shaft passes through the elongated hole.

[0052] In one embodiment, both frames 24 are provided with protrusions, and along the second direction, both sides of the key buckle 21 are provided with grooves, with the two protrusions slidingly engaging with the two grooves.

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9As shown, in an embodiment of the present invention, the tool body 100 includes: two handles 10, which are rotatably connected and have receiving grooves on them; and an installation component, in which one of the receiving grooves is installed. The installation component includes two skeletons 24, which are spaced apart along a second direction and form a storage channel between them.

[0054] In the above technical solution, on the one hand, the arrangement of the two frames 24 can reduce the chance of direct contact between the key ring 21 and the handle 10, avoiding friction between the key ring 21 and the handle 10 during movement, thereby reducing the wear of the handle 10 and extending the service life of the multi-functional folding tool; on the other hand, the design of the two handles 10 being rotatably connected allows one of the two handles 10 to be folded together with the other handle 10, greatly reducing the space requirements for storage and carrying, and improving portability; furthermore, the existence of the storage slot provides the multi-functional folding tool with rich expandability, and different tools can be installed in the storage slot, enabling the multi-functional folding tool to adapt to various usage scenarios.

[0055] Specifically, in the embodiments of this utility model, the two handles 10 are rotatably connected by rivets.

[0056] It should be noted that, in the embodiments of this utility model, when the two handles 10 are folded together, the two receiving slots can form a closed receiving space.

[0057] like Figures 1 to 6 , Figure 8 and Figure 9 As shown in the embodiment of the present invention, the frame 24 includes a first base bone 241 and a second base bone 242 that are connected and arranged at an angle, the key buckle 21 is located between the two second base bones 242, and at least one of the first base bone 241 and the second base bone 242 is connected to the corresponding handle 10.

[0058] In the above technical solution, on the one hand, the two second base bones 242 can restrict the movement of the key buckle 21 in the second direction, ensuring the stability of the key buckle 21 during operation; on the other hand, since the key buckle 21 is set between the two second base bones 242, the chance of the key buckle 21 directly contacting the handle 10 is reduced, thereby reducing the wear of the handle 10 and extending the service life of the multi-functional folding tool.

[0059] Preferably, in an embodiment of the present invention, the two spring pieces abut against the two second base bones 242 respectively.

[0060] like Figure 9As shown in the embodiment of this utility model, along a third direction, the second base rib 242 includes a first plate segment 2421 and a second plate segment 2422 connected to each other. The cross-sectional area of ​​the first plate segment 2421 is larger than the cross-sectional area of ​​the second plate segment 2422. A stepped surface 243 is formed between the first plate segment 2421 and the second plate segment 2422. The opposing sides of the two second plate segments 2422 and the two stepped surfaces 243 form a storage channel.

[0061] In the above technical solution, the opposing sides of the two second plate segments 2422 can restrict the movement of the key buckle 21 in the second direction, and the two stepped surfaces 243 and the limiting member 23 can restrict the movement of the key buckle 21 in the third direction. In this way, the key buckle 21 can only move in the first direction.

[0062] Preferably, in an embodiment of the present invention, the bottom surface of the key ring 21 is disposed on the stepped surface 243.

[0063] Specifically, in the embodiments of this utility model, the multifunctional folding tool also includes a pliers head 30, which is disposed in the accommodating space. The specific structure of the pliers head 30 and the connection method between the pliers head 30 and the tool body 100 can refer to the prior art, and will not be described in detail here.

[0064] Specifically, in an embodiment of this utility model, the second plate segment 2422 is provided with a second through hole 244, and the two ends of the limiting shaft pass through the two second through holes 244 respectively and are connected to the handle 10.

[0065] Specifically, in the embodiments of this utility model, either of the two handles 10 is provided with a key buckle 21, a limiting shaft and two skeletons 24.

[0066] In one embodiment, each of the two handles 10 is provided with a key ring 21, a limiting shaft, and two skeletons 24.

[0067] Specifically, in this embodiment of the invention, a movable keychain 21 is hidden between the two frames 24. Without affecting the overall appearance and coordination of the multi-functional folding tool, the function of the keychain 21 is retained, and users can choose whether to use the function according to their needs.

[0068] Specifically, in the embodiments of this utility model, the key ring 21 is hidden between the two skeletons 24 of the multi-functional folding tool, inserted into the limiting shaft and passing through the two second through holes 244 and the guide part 211, thereby achieving the movable limit. When the key ring 21 is in the storage position, frictional damping is generated between the spring piece and the skeleton 24, so that the key ring 21 will not loosen and fall out at will, thereby achieving the purpose of hiding the key ring 21.

[0069] Specifically, in this embodiment of the invention, the two handles 10 of the multi-functional folding tool are opened to a suitable position, the handle 10 containing the key ring 21 is located, the handle 10 is placed horizontally, and the push part 213 is pressed against it. In the first direction, the key ring 21 is pushed out forcefully until the key ring 21 can no longer move. At this time, the key ring 21 is in the use position. The key ring 21 is limited in the second direction by the left side of one of the two skeletons 24 and the right side of the other skeleton 24. It is limited in the third direction by the stepped surface 243 and the limiting shaft. By inserting the limiting shaft through the two second through holes 244 and the guide part 211, the stroke in the second direction can be limited. Frictional damping is generated between the spring and the skeleton 24, so that the key ring 21 will not loosen at will, and the push-out is completed.

[0070] Specifically, in the embodiments of this utility model, when the keychain 21 is in the use position, in any state of the multi-functional folding tool, the hanging part 212 is pushed forcefully until the outer contour of the keychain 21 is flush with the outer contour of the two skeletons 24, so that the keychain 21 is in the storage position.

[0071] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: When the user is not using the keychain, the keychain is pushed along the first direction so that the pushing part of the keychain is located in the accommodating space and the hanging part is located in the storage channel. In this way, compared with the prior art in which the keychain is exposed and fixed to the end of the tool body, in this utility model, the hanging part can be moved into the storage channel to avoid the keychain protruding from the tool body, thereby avoiding the phenomenon of affecting the overall appearance and grip of the multi-functional folding tool, and improving the user experience; When the user needs to use the keychain, the accommodating space is opened and the keychain is pushed along the first direction so that the keychain is switched from the storage position to the use position. The hanging part extends out of the storage channel through the end of the tool body, and the keyhole of the hanging part can hang the key.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-functional folding tool, characterized in that, include: The tool body (100) has a accommodating space and a storage channel communicating with the accommodating space. The accommodating space is closable, and the storage channel extends to and passes through the end of the tool body (100). A keychain (21) includes a hanging part (212) and a pushing part (213) connected to the hanging part (212). The hanging part (212) is provided with a keyhole (210) for hanging a key. The keychain (21) is movably disposed in the storage channel along a first direction. When the keychain (21) is pushed to the storage position, the pushing part (213) is located in the receiving space, and the hanging part (212) is stored in the storage channel. When the keychain (21) is pushed to the use position, the hanging part (212) extends out of the storage channel, and the pushing part (213) is located in the receiving space or the storage channel.

2. The multifunctional folding tool according to claim 1, characterized in that, Along the first direction, the suspension part (212) and the pushing part (213) are arranged opposite to each other. When the key fob (21) is in the storage position, the pushing part (213) is located in the accommodating space. When the key fob (21) is in the use position, the pushing part (213) is located in the storage channel.

3. The multifunctional folding tool according to claim 2, characterized in that, At least one side of the keychain (21) is connected to a damping element (22), which is located between the inner wall of the storage channel and the keychain (21), and the damping element (22) abuts against the inner wall of the storage channel.

4. The multifunctional folding tool according to claim 3, characterized in that, The damping member (22) extends along the first direction and includes a floating part (222) and a connecting part (221) disposed opposite to each other. The floating part (222) is floating relative to the connecting part (221) and is located on the side of the connecting part away from the keyhole (210).

5. The multifunctional folding tool according to claim 3, characterized in that, The damping element (22) is a plate-shaped structure made of elastic material, and the thickness of the damping element (22) gradually decreases from the pushing part (213) to the suspension part (212) along the first direction.

6. The multifunctional folding tool according to claim 2, characterized in that, The multi-functional folding tool also includes a limiting member (23), which is disposed in the storage channel and connected to the inner wall of the storage channel. The key buckle (21) is provided with a guide part (211), which extends along the first direction. The guide part (211) and the limiting member (23) are slidably engaged.

7. The multifunctional folding tool according to claim 6, characterized in that, The guide part (211) is an elongated hole, and the limiting member (23) is a limiting shaft passing through the elongated hole, and the limiting shaft is slidably engaged with the elongated hole.

8. The multi-functional folding tool according to any one of claims 1 to 7, characterized in that, The tool body (100) includes: Two handles (10) are rotatably connected, and each handle (10) is provided with a receiving groove; The mounting component is installed in one of the two receiving slots. The mounting component includes two skeletons (24) arranged at intervals along a second direction, and the two skeletons (24) form the storage channel between them.

9. The multifunctional folding tool according to claim 8, characterized in that, The frame (24) includes a first base bone (241) and a second base bone (242) that are connected and arranged at an angle. The key ring (21) is located between the two second base bones (242). At least one of the first base bone (241) and the second base bone (242) is connected to the corresponding handle (10).

10. The multifunctional folding tool according to claim 9, characterized in that, Along a third direction, the second base (242) includes a first plate segment (2421) and a second plate segment (2422) connected to each other. The cross-sectional area of ​​the first plate segment (2421) is larger than that of the second plate segment (2422). A stepped surface (243) is formed between the first plate segment (2421) and the second plate segment (2422). The opposing sides of the two second plate segments (2422) and the two stepped surfaces (243) enclose the storage channel.

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