Wear-resistant coupler

Abstract

The utility model discloses an anti-wear coupler. A lower coupler comprises a support, a base and a waterproof pad. The base is provided with a containing cavity, and the containing cavity faces the lower opening. The waterproof pad is contained in the containing cavity, the waterproof pad abuts against the top face of the containing cavity, the waterproof pad is provided with a protruding part, the protruding part is provided with a cavity and an inserting seam, and the cavity is communicated with the inserting seam; the support is contained in the containing cavity, the waterproof pad is located between the top face of the support and the top face of the containing cavity, the support is provided with an avoiding hole, a connecting hole and a cavity for containing the insertion spring, the connecting hole is communicated with the avoiding hole and the cavity, the avoiding hole is communicated with the cavity, and the inner diameter of the avoiding hole is larger than that of the cavity; through cooperation of the avoiding hole and the waterproof pad, even if an oblique insertion phenomenon occurs, avoiding is formed through the avoiding hole, so that abrasion between the waterproof pad and the base and the support is reduced, the waterproof pad is prevented from being abraded and broken, and the safety performance of long-term use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to an anti-wear coupler. Background Art

[0002] The coupler includes an upper coupler and a lower coupler. The lower coupler is fixed with several plug springs, and the upper coupler is fixed with plug pins. The plug pins are inserted into the lower coupler and cooperate with the plug springs inside it to form an electrical connection effect.

[0003] To improve the waterproof seal at the connection, conventional technology employs a waterproof gasket structure. This gasket is housed within the lower coupler and has an insertion slot. The pin first passes through the slot and then engages with the insertion spring. This structure suffers from the problem of oblique insertion during use (the upper and lower couplers do not move along the pin's axis, but rather deviate diagonally). This can cause the pin to rest against the edge of the insertion slot and prevent it from passing directly through it. This effectively leaves the gasket positioned between the pin and the bracket (a component of the lower coupler). Over time, this can cause the gasket to wear and tear, compromising the waterproof seal. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is how to prevent the waterproof pad from being worn.

[0005] To this end, a wear-resistant coupler comprising:

[0006] A lower coupler, comprising a bracket, a base, and a waterproof pad;

[0007] The base is provided with a receiving cavity, and the receiving cavity is open downward;

[0008] The waterproof pad is accommodated in the accommodating cavity, the waterproof pad abuts against the top surface of the accommodating cavity, the waterproof pad is provided with a raised portion, the raised portion is provided with a cavity and an insertion slot, and the cavity is communicated with the insertion slot;

[0009] The bracket is accommodated in the accommodating cavity, the waterproof pad is located between the top surface of the bracket and the top surface of the accommodating cavity, the bracket is provided with an avoidance hole, a connecting hole and a cavity for accommodating an insert spring, the connecting hole connects the avoidance hole and the cavity, the avoidance hole is connected to the cavity, and the inner diameter of the avoidance hole is larger than the inner diameter of the cavity.

[0010] The bracket is further provided with a guide hole, which communicates with the avoidance hole and the connecting hole, and the inner diameter of the connecting hole is smaller than the inner diameter of the guide hole.

[0011] One of the waterproof pad and the base is provided with a positioning protrusion, and the other one of the waterproof pad and the base is provided with a positioning groove matched with the positioning protrusion.

[0012] One of the waterproof pad and the base is provided with a positioning column, and the other one of the waterproof pad and the base is provided with a positioning hole matched with the positioning column.

[0013] The inner wall of the accommodating cavity is further provided with a supporting rib, which extends to the cavity and abuts against the insert spring; the waterproof pad is provided with a first notch, and the bracket is provided with a second notch, and the supporting rib passes through the first notch and the second notch and extends to the cavity.

[0014] The insertion seam is in an I-shape or a Y-shape.

[0015] The inner wall of the accommodating cavity is provided with isolation ribs; the cavity is provided with a side opening, and an isolation groove is provided between two adjacent cavities in the same row, and the side openings and the isolation grooves in the same row have the same orientation; the isolation ribs extend into the isolation grooves.

[0016] A limiting block is provided at the end of the isolation groove, and the limiting block is located on the movement track of the isolation rib.

[0017] The isolation groove is provided with a connecting block, the connecting block connects the two side walls of the isolation groove, and the isolation ribs are against the connecting block.

[0018] A first guide portion is provided at the front end of the isolation groove.

[0019] One of the bracket and the base is provided with a card slot, and the other of the bracket and the base is provided with a buckle matched with the card slot.

[0020] One of the bracket and the base is provided with a guide protrusion, and the other of the bracket and the base is provided with a guide groove matched with the guide protrusion.

[0021] The technical solution of this utility model has the following advantages:

[0022] 1. The utility model provides an anti-wear coupler, which cooperates with the waterproof pad through the avoidance hole. Even if oblique insertion occurs, the avoidance hole forms an avoidance, thereby reducing the wear between the waterproof pad and the base and bracket, preventing the waterproof pad from wearing and cracking, and improving the safety performance of long-term use.

[0023] 2. The utility model provides an anti-wear coupler, and the setting of the guide hole forms a guiding effect, so that the pin can more easily pass through the connecting hole and extend into the cavity to cooperate with the plug spring.

[0024] 3. The utility model provides an anti-wear coupler, in which the positioning protrusion cooperates with the positioning groove to form a fixed connection between the waterproof pad and the base, thereby preventing the waterproof pad from shaking.

[0025] 4. The utility model provides an anti-wear coupler, in which the positioning column cooperates with the positioning hole to form a fixed connection between the waterproof pad and the base, preventing the waterproof pad from shaking.

[0026] 5. The utility model provides an anti-wear coupler, wherein the support ribs are used to cooperate with the plug spring to form a supporting effect; the support ribs also form a limit fixation for the bracket and the waterproof pad, thereby improving the stability of the fixation between the bracket and the waterproof pad.

[0027] 6. The utility model provides an anti-wear coupler, which forms an isolation effect between two adjacent chambers in the same row through the cooperation of isolation ribs and isolation grooves, preventing creepage between two adjacent plug springs and forming a protective effect. Moreover, this structural setting makes the processing of the bracket more convenient, and during the assembly process, it can be assembled in parts, reducing the assembly difficulty and improving the assembly efficiency.

[0028] 7. The utility model provides an anti-wear coupler, in which the limit block forms a limiting effect to prevent excessive movement of the isolation rib. In addition, the limiting effect can also be achieved by other means, such as controlling the height of the isolation rib.

[0029] 8. The utility model provides an anti-wear coupler. The setting of the connecting block can firstly increase the strength of the bracket and prevent the isolation groove from affecting the overall strength. Secondly, the connecting block and the isolation ribs offset each other to form a supporting and fixing effect.

[0030] 9. The utility model provides an anti-wear coupler, wherein the first guide portion forms a guiding effect.

[0031] 10. The utility model provides an anti-wear coupler, in which the groove and the buckle cooperate to form a buckle connection effect, so that a detachable connection is formed between the bracket and the base.

[0032] 11. The utility model provides an anti-wear coupler, in which the guide protrusion and the guide groove cooperate to form a guiding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of an anti-wear coupler provided by the utility model;

[0035] Figure 2 An exploded view of an anti-wear coupler provided by the utility model;

[0036] Figure 3 A cross-sectional view of a wear-resistant coupler provided by the utility model;

[0037] Figure 4 A cross-sectional view of another angle of the wear-resistant coupler provided by the utility model;

[0038] Figure 5 for Figure 4 A partial enlarged view of part A in the middle;

[0039] Figure 6 A schematic diagram of the structure of the bracket provided by the utility model;

[0040] Figure 7 This is a structural diagram of the base provided by the utility model.

[0041] Description of reference numerals:

[0042] 11. Bracket; 12. Base; 13. Insert spring; 14. Waterproof pad; 15. Slot; 16. Buckle; 17. Guide protrusion; 18. Guide groove; 19. Positioning protrusion; 20. Positioning groove; 21. Positioning column; 22. Positioning hole; 111. Chamber; 112. Side opening; 113. Isolation groove; 114. Limit block; 115. Connecting block; 116. First guide portion; 117. Second notch; 118. Avoidance hole; 119. Connecting hole; 110. Guide hole; 121. Accommodating chamber; 122. Isolation rib; 123. Support rib; 124. Through hole; 141. First notch; 142. Raised portion; 143. Cavity; 144. Insert slit. DETAILED DESCRIPTION

[0043] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] This embodiment provides a wear-resistant coupler, as shown in the attached Figure 1-7 Shown, including:

[0049] The lower coupler is mainly described in this embodiment, and the upper coupler is a prior art and thus will not be described in detail.

[0050] The lower coupler includes a bracket 11 , a base 12 , and a waterproof pad 14 .

[0051] The base 12 has a housing cavity 121. In this embodiment, the top surface of the base 12 is used to mate with the upper coupler, achieving a plug-and-unplug connection. Several through-holes 124 are provided on the top surface of the base 12, through which the pins of the upper coupler extend. The housing cavity 121 is open downward, meaning that the bottom surface of the base 12 is through-hole. External wires pass through the bottom surface of the base 12 and connect to the internal plug spring 13, forming an electrical connection.

[0052] Waterproof pad 14 is housed within accommodating cavity 121, abutting against the top surface of accommodating cavity 121. Waterproof pad 14 has a raised portion 142, which mates with through-hole 124 to provide a waterproof seal for through-hole 124. Raised portion 142 defines a cavity 143 and an insertion slot 144, which communicate with each other. The pin extends through insertion slot 144 and cavity 143 into accommodating cavity 121.

[0053] Bracket 11 is housed in accommodating cavity 121, and waterproof pad 14 is located between the top surface of bracket 11 and the top surface of accommodating cavity 121. Here, waterproof pad 14 is fixed to base 12 through bracket 11. Bracket 11 is provided with an avoidance hole 118, a connecting hole 119, and a chamber 111 for accommodating insert spring 13. Connecting hole 119 connects avoidance hole 118 and chamber 111, and avoidance hole 118 is connected to cavity 143. When the pin is inserted, it passes through insertion slot 144, cavity 143, avoidance hole 118, connecting hole 119, and chamber 111 in sequence. The inner diameter of avoidance hole 118 is larger than the inner diameter of cavity 143. By cooperating with waterproof pad 14 through avoidance hole 118, even if oblique insertion occurs, avoidance is formed by avoidance hole 118, reducing wear between waterproof pad 14 and base 12 and bracket 11, preventing wear and tear of waterproof pad 14, and improving safety performance during long-term use.

[0054] Specifically, as attached Figure 5 As shown, the bracket 11 is also provided with a guide hole 110, which connects the avoidance hole 118 and the connecting hole 119. The inner diameter of the connecting hole 119 is smaller than the inner diameter of the guide hole 110. The provision of the guide hole 110 forms a guiding effect, making it easier for the pin to pass through the connecting hole 119 and extend into the cavity 111 to cooperate with the plug spring 13. The side surface of the guide hole 110 here can be an inclined surface or an arc surface. In addition, the guide hole 110 can be omitted, and a plug-in fit can be formed; or guidance can be performed through other guiding structures (such as guide blocks).

[0055] Specifically, the avoidance hole 118 and the cavity 143 are coaxially arranged, that is, the central axis of the avoidance hole 118 and the central axis of the cavity 143 are collinear.

[0056] Specifically, as attached Figure 1-7 As shown, the raised portion 142 extends to the through hole 124. At this time, the top surface of the raised portion 142 is coplanar with the top surface of the base 12. Here, the top surface of the raised portion 142 can also exceed the top surface of the base 12. The outer side wall of the raised portion 142 is in contact with the inner side wall of the through hole 124 to form a sealing effect.

[0057] Specifically, as attached Figure 1-7As shown, one of the waterproof pad 14 and the base 12 is provided with a positioning protrusion 19, while the other is provided with a positioning groove 20 that cooperates with the positioning protrusion 19. The positioning protrusion 19 and the positioning groove 20 cooperate to secure the waterproof pad 14 to the base 12, preventing the waterproof pad 14 from shaking. In this embodiment, the positioning protrusion 19 is provided on the top surface of the base 12, and the positioning groove 20 is provided on the waterproof pad 14, creating a mutually coordinated effect. In this embodiment, the positioning groove 20 is provided on the top surface of the waterproof pad 14, but does not extend through the entire waterproof pad 14. Here, the positioning groove 20 is a groove structure.

[0058] Specifically, as attached Figure 1-7 As shown, one of the waterproof pad 14 and the base 12 is provided with a positioning post 21, and the other is provided with a positioning hole 22 that cooperates with the positioning post 21. The positioning post 21 cooperates with the positioning hole 22 to secure the waterproof pad 14 to the base 12, preventing the waterproof pad 14 from shaking. Here, the positioning hole 22 is provided through the waterproof pad 14, and the positioning post 21 is located on the top surface of the base 12.

[0059] Specifically, as attached Figure 1-7 As shown, the inner wall of the accommodating cavity 121 is further provided with a support rib 123, which extends to the cavity 111 and abuts against the insertion spring 13. The waterproof pad 14 is provided with a first notch 141, and the bracket 11 is provided with a second notch 117. The support rib 123 passes through the first notch 141 and the second notch 117 and extends to the cavity 111. The support rib 123 is used to cooperate with the insertion spring 13 to form a supporting effect. Here, the support rib 123 passes through the side opening 112 of the cavity 111 and abuts against the insertion spring 13. In this embodiment, the support rib 123 and the isolation rib 122 are both provided on the long side surface of the base 12, and the support rib 123 and the isolation rib 122 are provided in parallel. The number of the support ribs 123 here corresponds to the number of the cavities 111. The support rib 123 also forms a limiting fixation for the bracket 11 and the waterproof pad 14, thereby improving the stability of the fixation between them.

[0060] Specifically, the insertion slot 144 is in an I-shape or a Y-shape. The structure of the insertion slot 144 can be adjusted according to actual needs.

[0061] Specifically, as attached Figure 1-7 As shown, the inner wall of the accommodating cavity 121 is provided with isolation ribs 122. The number of isolation ribs 122 can be adjusted according to actual needs. In this embodiment, the isolation ribs 122 extend downward from the top surface to the bottom surface of the accommodating cavity 121 (here refers to the direction of the height of the isolation ribs 122).

[0062] The bracket 11 is provided with a plurality of chambers 111 arranged in an array. The number of chambers 111 can be adjusted according to actual needs. In this embodiment, the chambers 111 are arranged in two rows, specifically a front row and a rear row. The number of chambers 111 in each row can also be adjusted according to actual needs. The chambers 111 are provided with side openings 112. For example, the chambers 111 in the front row have side openings 112 facing the front side, while the chambers 111 in the rear row have side openings 112 facing the rear side. An isolation slot 113 is provided between two adjacent chambers 111 in the same row. The side openings 112 and isolation slots 113 in the same row have the same orientation. That is, the side openings 112 in the front row face the front side, and the isolation slots 113 in the front row also face the front side. The chambers 111 are fixed with plug springs 13. The fixing structure between the plug springs 13 and the chambers 111 is conventional and will not be described in detail in this embodiment.

[0063] The isolation rib 122 extends into the isolation groove 113. When the bracket 11 is matched with the base 12, the isolation rib 122 extends into the isolation groove 113, forming a match between the isolation rib 122 and the isolation groove 113. For example, the isolation groove 113 in the front row is facing the front side. At this time, the isolation rib 122 matched with the front row is facing the rear side (here refers to the direction of the length of the isolation rib 122). When the isolation rib 122 and the isolation groove 113 are matched, an intersection in the horizontal direction is formed, thereby increasing the creepage distance and improving the anti-creeping effect. Through the matching of the isolation rib 122 and the isolation groove 113, an isolation effect is formed between two adjacent chambers 111 in the same row, preventing creepage from occurring in two adjacent plug springs 13, forming a protective effect. Moreover, this structural setting makes the processing of the bracket 11 more convenient, and during the assembly process, it can be assembled in parts, reducing the assembly difficulty and improving the assembly efficiency. The side opening 112 of the bracket 11 is set here, specifically one side of the chamber 111 is directly connected to the accommodating chamber 121, which reduces the processing difficulty. Compared with the prior art, the chamber 111 has only two upper and lower openings. During the processing, due to the height of the chamber 111, the strength of the side wall of the bracket 11 is relatively low after demolding, so it is necessary to add corresponding structures to improve the overall strength of the bracket 11, resulting in high processing difficulty. The setting of the side opening 112 reduces the processing difficulty.

[0064] Specifically, as attached Figure 1-7 As shown, a stopper 114 is provided at the end of the isolation groove 113. Here, the end of the isolation groove 113 specifically refers to the lower end region of the isolation groove 113. Stopper 114 is located on the motion trajectory of the isolation rib 122. Stopper 114 provides a limiting effect, preventing excessive movement of the isolation rib 122. Other methods, such as controlling the height of the isolation rib 122, can also achieve this limiting effect.

[0065] Specifically, the isolation ribs 122 are disposed on the long side surfaces. In this embodiment, the cross-section of the base 12 is a runway-shaped structure, comprising two long side surfaces and two curved surfaces. The two long side surfaces are disposed on the front and rear sides, respectively, and the two curved surfaces are disposed on the left and right sides, respectively.

[0066] Specifically, as attached Figure 1-7 As shown, the isolation groove 113 is provided with a connecting block 115, which connects the two side walls of the isolation groove 113. The isolation ribs 122 abut against the connecting block 115. Here, the connecting block 115 horizontally connects the two side walls of the isolation groove 113. The provision of the connecting block 115 firstly increases the strength of the bracket 11 by preventing the isolation groove 113 from affecting the overall strength. Secondly, the connecting block 115 abuts against the isolation ribs 122, forming a supporting and fixing effect.

[0067] Specifically, as attached Figure 1-7 As shown, the isolation slots 113 in the front and rear rows are connected to each other. For example, an isolation slot 113I is provided between the first and second left chambers 111 in the front row, and an isolation slot 113II is provided between the first and second left chambers 111 in the rear row. Isolation slots 113I and 113II are connected front to back, forming a single isolation slot 113. To ensure strength, the isolation slots 113 are provided with connecting blocks 115.

[0068] Specifically, a first guide portion 116 is provided at the front end of the isolation groove 113. The front end of the isolation groove 113 specifically refers to the upper end region of the isolation groove 113. The first guide portion 116 provides a guiding effect. Here, the first guide portion 116 can be an arc-shaped surface or an inclined surface.

[0069] Specifically, as attached Figure 1-7 As shown, one of the bracket 11 and the base 12 is provided with a slot 15, and the other of the bracket 11 and the base 12 is provided with a buckle 16 that cooperates with the slot 15. The cooperation between the slot 15 and the buckle 16 forms a buckle connection, thereby forming a detachable connection between the bracket 11 and the base 12. In this embodiment, the buckle 16 is provided on the bracket 11 and the slot 15 is provided on the base 12. Here, the buckle 16 is specifically provided on the limit block 114.

[0070] Specifically, as attached Figure 1-7 As shown, one of the bracket 11 and the base 12 is provided with a guide protrusion 17, and the other of the bracket 11 and the base 12 is provided with a guide groove 18 that cooperates with the guide protrusion 17. The cooperation between the guide protrusion 17 and the guide groove 18 creates a guiding effect. In this embodiment, the guide groove 18 is provided on the left side of the bracket 11, and the guide protrusion 17 is provided on the right side of the bracket 11. The two curved surfaces of the base 12 are also provided with corresponding ones, forming a staggered and complementary effect, thereby improving the efficiency of guidance.

[0071] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A wear-resistant coupler, characterized in that: include: A lower coupler, the lower coupler comprising a bracket (11), a base (12), and a waterproof pad (14); The base (12) is provided with a receiving cavity (121), and the receiving cavity (121) is open downward; The waterproof pad (14) is accommodated in the accommodating cavity (121), the waterproof pad (14) abuts against the top surface of the accommodating cavity (121), the waterproof pad (14) is provided with a raised portion (142), the raised portion (142) is provided with a cavity (143) and an insertion slit (144), and the cavity (143) is communicated with the insertion slit (144); The bracket (11) is accommodated in the accommodating cavity (121), and the waterproof pad (14) is located between the top surface of the bracket (11) and the top surface of the accommodating cavity (121). The bracket (11) is provided with a avoidance hole (118), a connecting hole (119), and a cavity (111) for accommodating the insert spring (13). The connecting hole (119) communicates with the avoidance hole (118) and the cavity (111), and the avoidance hole (118) is communicated with the cavity (143). The inner diameter of the avoidance hole (118) is larger than the inner diameter of the cavity (143).

2. The wear-resistant coupler according to claim 1, characterized in that The bracket (11) is further provided with a guide hole (110), wherein the guide hole (110) communicates with the avoidance hole (118) and the connection hole (119), and the inner diameter of the connection hole (119) is smaller than the inner diameter of the guide hole (110).

3. The wear-resistant coupler according to claim 1, characterized in that One of the waterproof pad (14) and the base (12) is provided with a positioning protrusion (19), and the other of the waterproof pad (14) and the base (12) is provided with a positioning groove (20) that cooperates with the positioning protrusion (19).

4. The wear-resistant coupler according to claim 1, characterized in that One of the waterproof pad (14) and the base (12) is provided with a positioning column (21), and the other of the waterproof pad (14) and the base (12) is provided with a positioning hole (22) matched with the positioning column (21).

5. The wear-resistant coupler according to claim 1, characterized in that The inner wall of the accommodating cavity (121) is further provided with a supporting rib (123), and the supporting rib (123) extends to the cavity (111) and abuts against the insert spring (13); the waterproof pad (14) is provided with a first notch (141), and the bracket (11) is provided with a second notch (117), and the supporting rib (123) passes through the first notch (141) and the second notch (117) and extends to the cavity (111).

6. The wear-resistant coupler according to claim 1, characterized in that The insertion slot (144) is in an I-shape or a Y-shape.

7. The wear-resistant coupler according to claim 1, characterized in that An isolation rib (122) is provided on the inner wall of the accommodating cavity (121); the chamber (111) is provided with a side opening (112); an isolation groove (113) is provided between two adjacent chambers (111) in the same row; the side openings (112) and the isolation grooves (113) in the same row have the same orientation; and the isolation rib (122) extends into the isolation grooves (113).

8. The wear-resistant coupler according to claim 7, characterized in that A limiting block (114) is provided at the end of the isolation groove (113), and the limiting block (114) is located on the movement track of the isolation rib (122).

9. The wear-resistant coupler according to claim 7, characterized in that The isolation groove (113) is provided with a connecting block (115), the connecting block (115) connects two side walls of the isolation groove (113), and the isolation rib (122) abuts against the connecting block (115).

10. The wear-resistant coupler according to claim 7, characterized in that A first guide portion (116) is provided at the front end of the isolation groove (113).

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