Pin capable of cross-folding

Abstract

The utility model discloses the plug of cross folding of prong can belong to plug technical field, and the design is solved when the existing prong plug is inserted in the power socket still has the problem such as the trend of swinging relative to the plug. The utility model discloses the plug of cross folding of prong can include: E pole prong subassembly, the both sides of E pole rotating spare are provided with E pole gear respectively, N pole prong subassembly, N pole gear and one side's E pole gear are engaged, and N pole prong and E pole prong can synchronous and reverse swing, L pole prong subassembly, L pole gear and the other side's E pole gear are engaged, and L pole prong and E pole prong can synchronous and reverse swing, two elastic parts and two limit parts. The utility model discloses the plug of cross folding of prong can, and two limit parts can be respectively abutted N pole prong subassembly and L pole prong subassembly under the impetus of elastic part, thereby preventing N pole prong subassembly and L pole prong subassembly swing respectively relative to the plug, and the security is high, and the use experience is good.

Description

Technical Field

[0001] This utility model relates to the field of plug technology, and in particular to a plug with foldable prongs. Background Technology

[0002] Most electrical appliances have plugs for connecting to a power source. Plugs typically have two to three prongs for making contact with a power outlet. When the plug is not plugged in, the prongs protrude from the surface of the plug, taking up a lot of space, making it inconvenient to store and carry, and resulting in a poor user experience.

[0003] Some existing plugs have foldable prongs, meaning the prongs can rotate around their base. When not in use, the prongs can rotate and fit snugly against the surface of the plug, taking up little space and making them easy to store and carry.

[0004] The drawbacks of existing foldable plugs include: the swivel structure of the plug leads to instability of the plug relative to the plug. When the plug is inserted into the power socket, especially when the plug is long and cannot be fully inserted into the power socket, the plug still tends to swivel relative to the plug, resulting in poor safety. Utility Model Content

[0005] The purpose of this invention is to propose a plug with foldable prongs, which solves the problem that the prongs still tend to swing relative to the plug when inserted into the power socket, making it safer to use.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A plug with foldable prongs includes: an E-pole prong assembly, comprising an E-pole prong and an E-pole rotating component, wherein E-pole gears are respectively provided on both sides of the E-pole rotating component; an N-pole prong assembly, comprising an N-pole prong and an N-pole rotating component, wherein an N-pole gear is provided on the N-pole rotating component, the N-pole gear meshing with the E-pole gear on one side, and the N-pole prong and the E-pole prong rotating synchronously and in opposite directions; an L-pole prong assembly, comprising an L-pole prong and an L-pole rotating component, wherein an L-pole gear is provided on the L-pole rotating component, the L-pole gear meshing with the E-pole gear on the other side, and the L-pole prong and the E-pole prong rotating synchronously and in opposite directions; two elastic members; and two limiting members, wherein one limiting member can limit the rotation angle of the N-pole prong assembly under the push of one elastic member, and the other limiting member can limit the rotation angle of the L-pole prong assembly under the push of the other elastic member.

[0008] In one preferred embodiment, the limiting member includes: a limiting post for connecting the elastic member; and a limiting body for abutting the N-pole plug assembly or the L-pole plug assembly to limit the rotation angle of the N-pole plug assembly and the L-pole plug assembly.

[0009] In one preferred embodiment, the limiting body is triangular prism-shaped, the N-pole rotating component is provided with an N-pole slot, the L-pole rotating component is provided with an L-pole slot, and the limiting inclined surface on the limiting body can extend into the N-pole slot and the L-pole slot to limit the rotation angle of the N-pole pin assembly and the L-pole pin assembly.

[0010] In one preferred embodiment, the elastic element is a spring, one end of the elastic element abuts against the fixed surface, and the other end of the elastic element is sleeved on the outside of the limiting post and abuts against the limiting body.

[0011] In one preferred embodiment, the plug further includes a pressure block, on which a spring arm with elastic deformation capability is provided, and an E-pole protrusion is provided on the E-pole rotating component. The end of the spring arm can abut against the outer surface of the E-pole rotating component; when the E-pole rotating component swings, the end of the spring arm can pass over the E-pole protrusion.

[0012] In one preferred embodiment, the E-pole rotating component is provided with two E-pole protrusions, and when the E-pole pin is in the working position, the end of the elastic arm is located between the two E-pole protrusions.

[0013] In one preferred embodiment, the N-pole rotating member and the L-pole rotating member are fixedly connected by a support column.

[0014] In one preferred embodiment, the plug further includes two conductive clips made of metal. The N-pole pin has a rectangular cross-section perpendicular to the axis at its tail end, and the L-pole pin has a rectangular cross-section perpendicular to the axis at its tail end. One conductive clip clamps the tail end of the N-pole pin, and the other conductive clip clamps the tail end of the L-pole pin.

[0015] In one preferred embodiment, the N-pole pin is cylindrical, the N-pole rotating member includes an N-pole sleeve, and the N-pole pin passes through the N-pole sleeve; and / or, the L-pole pin is cylindrical, the L-pole rotating member includes an L-pole sleeve, and the L-pole pin passes through the L-pole sleeve.

[0016] In one preferred embodiment, the plug further includes a housing with three parallel pin grooves on the housing, the three pin grooves being used to accommodate the cross-folded E pin, N pin, and L pin respectively.

[0017] The plug disclosed in this utility model has cross-folding pins. When the N-pole and L-pole are perpendicular to the surface of the plug, the two limiting members can abut against the N-pole and L-pole components respectively under the push of the elastic member, thereby preventing the N-pole and L-pole components from swinging relative to the plug. Due to the meshing of the gears, the E-pole component will also not swing relative to the plug, which is safe and provides a good user experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the plug provided in a specific embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the plug after removing the outer shell, provided in a specific embodiment of this utility model;

[0020] Figure 3 yes Figure 2 Exploded view of the middle structure;

[0021] Figure 4 This is a schematic diagram of the combined structure of the E-pin assembly, N-pin assembly, L-pin assembly and conductive clip provided in a specific embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the E-pole connector assembly provided in a specific embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the combined structure of the N-pole plug assembly, L-pole plug assembly, and support column provided in a specific embodiment of this utility model;

[0024] Figure 7 This is an exploded view of the combined structure of the N-pole plug assembly, L-pole plug assembly, and support column provided in a specific embodiment of this utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the limiting member provided in a specific embodiment of this utility model;

[0026] Figure 9 This is a schematic diagram of the structure of the pressure block provided in a specific embodiment of this utility model;

[0027] Figure 10 This is a schematic diagram of the combined structure of the conductive clip, conductive sheet, and end connection part provided in a specific embodiment of this utility model.

[0028] In the picture:

[0029] 1. E-pole pin assembly; 2. N-pole pin assembly; 3. L-pole pin assembly; 4. Elastic element; 5. Limiting element; 6. Pressure block; 7. Support column; 8. Conductive clamp; 9. Housing; 11. E-pole pin; 12. E-pole rotating element; 13. E-pole gear; 14. E-pole protrusion; 21. N-pole pin; 22. N-pole rotating element; 23. N-pole gear; 24. N-pole slot; 25. N-pole sleeve; 31. L-pole pin assembly ... slot; 24. N-pole slot; 25. N-pole sleeve; 36. L-pole slot; 27. N-pole slot; 28. N-pole slot; 29. ​​N-pole slot; 20. N-pole slot; 21. L-pole slot; 22. N-pole slot; 23. N-pole slot; 24. N-pole slot; 25. L-pole slot; 26. L-pole slot; 27. N-pole slot; 28. L-pole slot; 29. ​​L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L-pole slot; 20. L 32. L-pole rotating component; 33. L-pole gear; 34. L-pole slot; 35. L-pole sleeve; 51. Limiting post; 52. Limiting body; 53. Limiting inclined surface; 61. Elastic arm; 62. Rotating groove; 63. Pin limiting groove; 64. Elastic component limiting groove; 81. Conductive sheet; 82. End connection part; 91. Pin groove; 211. N-pole pin tail end; 311. L-pole pin tail end. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] This embodiment discloses a plug with foldable prongs, such as... Figures 1 to 7 As shown, the plug includes an E-pole pin assembly 1, an N-pole pin assembly 2, an L-pole pin assembly 3, two elastic members 4, and two limiting members 5. The E-pole pin assembly 1 includes an E-pole pin 11 and an E-pole rotating member 12, with E-pole gears 13 on both sides of the E-pole rotating member 12. The N-pole pin assembly 2 includes an N-pole pin 21 and an N-pole rotating member 22, with an N-pole gear 23 on the N-pole rotating member 22, which meshes with the E-pole gear 13 on one side. The L-pole pin assembly 3 includes an L-pole pin 31 and an L-pole rotating member 32, with an L-pole gear 33 on the L-pole rotating member 32, which meshes with the E-pole gear 13 on the other side.

[0037] The N-pole pin 21 and E-pole pin 11 can rotate synchronously and in opposite directions, and the L-pole pin 31 and E-pole pin 11 can rotate synchronously and in opposite directions. That is, E-pole pin 11 can rotate downwards / upwards until it touches the surface of the plug, and N-pole pin 21 and L-pole pin 31 can rotate upwards / downwards synchronously until they touch the surface of the plug. The three pins fold in a crisscross pattern, making full use of the plug's surface area for storage, resulting in a smaller overall footprint, easier storage and portability, and a better user experience.

[0038] The elastic element 4 and the limiting element 5 are used in combination. One limiting element 5, pushed by one elastic element 4, can limit the rotation angle of the N-pole plug assembly 2, and the other limiting element 5, pushed by another elastic element 4, can limit the rotation angle of the L-pole plug assembly 3. When the N-pole plug 21 and L-pole plug 31 are perpendicular to the surface of the plug, the two limiting elements 5 can abut against the N-pole plug assembly 2 and L-pole plug assembly 3 respectively under the push of the elastic element 4, thereby preventing the N-pole plug assembly 2 and L-pole plug assembly 3 from swinging relative to the plug. The E-pole gear 13 meshes with the N-pole gear 23 and L-pole gear 33 respectively. When both the N-pole plug assembly 2 and L-pole plug assembly 3 are in a stable state, the E-pole plug assembly 1 will not swing relative to the plug, resulting in high safety and a good user experience.

[0039] The specific structure of the N-pole plug assembly 2 is not limited. In this embodiment, the N-pole plug 21 is cylindrical, and the N-pole rotating component 22 includes an N-pole sleeve 25. After assembly, the N-pole plug 21 passes through the N-pole sleeve 25. When the N-pole sleeve 25 swings around the hinge, the N-pole plug 21 can swing synchronously with the N-pole sleeve 25.

[0040] The specific structure of the L-pole plug assembly 3 is not limited. In this embodiment, the L-pole plug 31 is columnar, and the L-pole rotating component 32 includes an L-pole sleeve 35. After assembly, the L-pole plug 31 is inserted into the L-pole sleeve 35. When the L-pole sleeve 35 rotates around the hinge, the L-pole plug 31 can rotate synchronously with the L-pole sleeve 35.

[0041] To improve stability, the N-pole rotating component 22 and the L-pole rotating component 32 are fixedly connected by the support column 7. That is, the N-pole rotating component 22 and the L-pole rotating component 32 form an integral structure that can rotate synchronously. When one set of elastic elements 4 and limiting elements 5 fails, the other set of elastic elements 4 and limiting elements 5 can still prevent the N-pole pin assembly 2 and the L-pole pin assembly 3 from rotating relative to the plug, making it safer to use.

[0042] Based on the above structure, the plug also includes a housing 9. The housing 9 has three parallel pin grooves 91 and a third through hole, each through hole located at the end of one pin groove 91. When the plug is not in use, manually press one of the three pins—E pin 11, N pin 21, and L pin 31—towards the plug surface. The other two pins will simultaneously tilt towards the plug surface until the crossed-folded E pin 11, N pin 21, and L pin 31 are respectively inserted into the three pin grooves 91. The edges of the pin grooves 91 limit the pin movement, preventing radial movement and bending or even breakage of the pins, thus extending their lifespan.

[0043] The specific structure of the limiting member 5 is not limited, as long as it can prevent the N-pole plug assembly 2 and the L-pole plug assembly 3 from rotating relative to the plug. In this embodiment, as shown... Figure 4 and Figure 8 As shown, the limiting member 5 includes a limiting post 51 and a limiting body 52 connected to each other. The limiting post 51 is used to connect the elastic member 4, and the limiting body 52 is used to abut against the N-pole plug assembly 2 or the L-pole plug assembly 3.

[0044] In this embodiment, the elastic element 4 is a spring. One end of the elastic element 4 abuts against any fixed surface on the plug that can provide support, and the other end of the elastic element 4 is sleeved on the outside of the limiting post 51 and abuts against the limiting body 52. ​​The elastic element 4 can apply a pushing force to the limiting body 52, so that the limiting body 52 abuts against the N-pole plug assembly 2 and the L-pole plug assembly 3 respectively, thereby limiting the rotation angle of the N-pole plug assembly 2 and the L-pole plug assembly 3.

[0045] The specific shape of the limiting body 52 is not limited. In this embodiment, the limiting body 52 is a triangular prism, with the extension direction of the spring as the vertical direction, and the axis of the triangular prism structure is set horizontally. Therefore, the top of the limiting body 52 includes two limiting inclined surfaces 53, which together form a sloping roof shape. The N-pole rotating component 22 is provided with an N-pole slot 24, and the L-pole rotating component 32 is provided with an L-pole slot 34. The limiting inclined surfaces 53 on the limiting body 52 can extend into the N-pole slot 24 and the L-pole slot 34.

[0046] When the N-pole rotating component 22 and the L-pole rotating component 32 tend to swing unexpectedly, the thrust of the elastic component 4 causes the limiting body 52 to be stuck in the N-pole slot 24 and the L-pole slot 34, preventing the N-pole rotating component 22 and the L-pole rotating component 32 from swinging, thereby limiting the rotation angle of the N-pole pin assembly 2 and the L-pole pin assembly 3.

[0047] When the prongs need to be folded, a sufficiently large tilting pressure is applied to one of the three prongs—E pin 11, N pin 21, and L pin 31—causing it to swing towards the plug surface. The edges of the N pin slot 24 and L pin slot 34 can apply a pushing force to the limiting slope 53. A portion of the pushing force on the limiting slope 53 can compress the elastic element 4 until the limiting body 52 exits the N pin slot 24 and L pin slot 34. The E pin 11, N pin 21, and L pin 31 tilt synchronously towards the plug surface until they fit against the plug surface.

[0048] Based on the above structure, such as Figure 3 and Figure 9 As shown, the plug also includes a pressure block 6, which has three rotating grooves 62, two pin limiting grooves 63, two elastic element limiting grooves 64, and a spring arm 61 with elastic deformation capability. After assembly, the E-pole rotating component 12, N-pole rotating component 22, and L-pole rotating component 32 are respectively set in the three rotating grooves 62. The rotating grooves 62 can limit the rotating components to prevent accidental movement. The pin limiting grooves 63 can limit the N-pole sleeve 25 and L-pole sleeve 35 located therein to prevent radial movement of the N-pole sleeve 25 and L-pole sleeve 35. The two elastic elements 4 are partially embedded in the elastic element limiting grooves 64. The elastic element limiting grooves 64 can prevent the elastic elements 4 from moving radially, but do not affect the normal extension and contraction of the elastic elements 4, and do not affect the insertion and withdrawal of the limiting components 5 into and out of the N-pole slot 24 and L-pole slot 34.

[0049] The E-pole rotating component 12 is provided with an E-pole protrusion 14, and the end of the elastic arm 61 can abut against the outer surface of the E-pole rotating component 12. When the E-pole rotating component 12 rotates, the end of the elastic arm 61 can pass over the E-pole protrusion 14. The elastic arm 61 can adjust the rotation tightness of the E-pole rotating component 12, improve the feel when folding the pins, and provide a better user experience.

[0050] Based on the above structure, the E-pole rotating component 12 is provided with two E-pole protrusions 14. When the E-pole pin 11 is in the working position (i.e., the E-pole pin 11 is perpendicular to the plug surface), the end of the elastic arm 61 is located between the two E-pole protrusions 14, thereby limiting the E-pole rotating component 12. When it is necessary to fold the E-pole pin 11, a sufficiently large rotational force needs to be applied to the E-pole rotating component 12. The E-pole protrusions 14 push the elastic arm 61, and after the elastic arm 61 deforms elastically, its end can pass over the E-pole protrusions 14, releasing the limitation on the E-pole rotating component 12.

[0051] In order to ensure that the pins can be stably connected to the power supply, in this embodiment, as follows: Figure 4 and Figure 10 As shown, the plug also includes two conductive clips 8 made of metal, which can be connected to a power source via a conductive piece 81 and an end connection portion 82.

[0052] The N-pole pin 211 has a rectangular cross-section perpendicular to the axis at its tail end 211, and the L-pole pin 31 has a rectangular cross-section perpendicular to the axis at its tail end 311. One conductive clip 8 clamps the N-pole pin tail end 211, and another conductive clip 8 clamps the L-pole pin tail end 311. The rectangular tail ends 211 and 311 of the N-pole pins can be more stably held in the conductive clips 8, resulting in better conductivity and safer use.

[0053] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A plug with foldable prongs, characterized in that, include: E-pole plug assembly (1) includes an E-pole plug (11) and an E-pole rotating component (12), wherein E-pole gears (13) are respectively provided on both sides of the E-pole rotating component (12); The N-pole plug assembly (2) includes an N-pole plug (21) and an N-pole rotating component (22). An N-pole gear (23) is provided on the N-pole rotating component (22). The N-pole gear (23) meshes with the E-pole gear (13) on one side. The N-pole plug (21) and the E-pole plug (11) can rotate synchronously and in opposite directions. The L-pole plug assembly (3) includes an L-pole plug (31) and an L-pole rotating component (32). An L-pole gear (33) is provided on the L-pole rotating component (32). The L-pole gear (33) meshes with the E-pole gear (13) on the other side. The L-pole plug (31) and the E-pole plug (11) can rotate synchronously and in opposite directions. Two elastic elements (4); and, Two limiting members (5), one of which can limit the rotation angle of the N-pole plug assembly (2) under the push of one elastic member (4), and the other limiting member (5) can limit the rotation angle of the L-pole plug assembly (3) under the push of the other elastic member (4).

2. The plug with cross-folding prongs according to claim 1, characterized in that, The limiting member (5) includes: A limiting post (51) is used to connect the elastic element (4); and, The limiting body (52) is used to abut against the N-pole plug assembly (2) or the L-pole plug assembly (3) to limit the rotation angle of the N-pole plug assembly (2) and the L-pole plug assembly (3).

3. The plug with cross-folding prongs according to claim 2, characterized in that, The limiting body (52) is triangular prism-shaped. The N pole rotating component (22) is provided with an N pole slot (24), and the L pole rotating component (32) is provided with an L pole slot (34). The limiting inclined surface (53) on the limiting body (52) can extend into the N pole slot (24) and the L pole slot (34) to limit the rotation angle of the N pole pin assembly (2) and the L pole pin assembly (3).

4. The plug with cross-folding prongs according to claim 2, characterized in that, The elastic element (4) is a spring. One end of the elastic element (4) abuts against the fixed surface, and the other end of the elastic element (4) is sleeved on the outside of the limiting post (51) and abuts against the limiting body (52).

5. A plug with foldable prongs according to any one of claims 1 to 4, characterized in that, The plug also includes a pressure block (6), on which a spring arm (61) with elastic deformation capability is provided. An E pole protrusion (14) is provided on the E pole rotating component (12). The end of the spring arm (61) can abut against the outer surface of the E pole rotating component (12). When the E pole rotating component (12) swings, the end of the spring arm (61) can pass over the E pole protrusion (14).

6. The plug with cross-folding prongs according to claim 5, characterized in that, The E-pole rotating component (12) is provided with two E-pole protrusions (14). When the E-pole pin (11) is in the working position, the end of the elastic arm (61) is located between the two E-pole protrusions (14).

7. A plug with foldable prongs according to any one of claims 1 to 4, characterized in that, The N-pole rotating component (22) and the L-pole rotating component (32) are fixedly connected by a support column (7).

8. A plug with foldable prongs according to any one of claims 1 to 4, characterized in that, The plug also includes two conductive clips (8) made of metal. The N-pole pin (211) has a rectangular cross-section perpendicular to the axis, and the L-pole pin (31) has a rectangular cross-section perpendicular to the axis. One of the conductive clips (8) clamps the N-pole pin (211), and the other conductive clip (8) clamps the L-pole pin (311).

9. A plug with foldable prongs according to any one of claims 1 to 4, characterized in that, The N-pole pin (21) is cylindrical, and the N-pole rotating component (22) includes an N-pole sleeve (25), in which the N-pole pin (21) passes; and / or, The L-pole pin (31) is cylindrical, and the L-pole rotating component (32) includes an L-pole sleeve (35), with the L-pole pin (31) passing through the L-pole sleeve (35).

10. A plug with foldable prongs according to any one of claims 1 to 4, characterized in that, The plug also includes a housing (9) with three parallel pin grooves (91) on the housing (9). The three pin grooves (91) are respectively used to accommodate the cross-folded E-pole pin (11), N-pole pin (21) and L-pole pin (31).

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