Motor home sewage adapter

Abstract

The invention provides a motor home sewage adapter, relates to the technical field of motor homes, and aims to solve the technical problem that in the prior art, after a sewage adapter is connected with a sewage discharging connector, the sewage adapter is possibly difficult to connect with a water discharging pipe or even cannot be connected with the water discharging pipe. A sewage adapter for a motor home is characterized in that a square bend comprises a horizontal section and a vertical section, a shaft sleeve sleeves the vertical section and is rotatably connected with the vertical section, a plurality of first protrusions are distributed on the peripheral wall of the shaft sleeve in the circumferential direction, and an upper cover and a lower cover sleeve the upper end and the lower end of the vertical section respectively; the supporting plate assembly is arranged on the peripheral wall of the shaft sleeve in a sleeving mode and comprises a plurality of fan-shaped supporting plates which are distributed in the circumferential direction and connected with one another, the upper end and the lower end of each fan-shaped supporting plate are connected with the upper cover and the lower cover respectively, and at least one first supporting face and at least one second supporting face are distributed on the inner wall of each fan-shaped supporting plate in the circumferential direction. The first supporting face is closer to the shaft sleeve than the second supporting face in the radial direction, and the first protrusion faces the first supporting face or the second supporting face by rotating the shaft sleeve.

Description

Technical Field

[0001] This invention relates to the field of RV technology, specifically to an RV wastewater adapter. Background Technology

[0002] When a motorhome is parked at a campsite or parking lot, its wastewater drain pipe needs to be connected to a pre-buried drain connector in the ground to discharge wastewater. To achieve this connection, a wastewater adapter is usually required. Currently, common wastewater adapters generally have a bent pipe-like structure, with a laterally extending drain interface section for connecting to the motorhome's drain pipe and a longitudinally extending connecting section for connecting to the ground drain connector. The two are usually arranged at right angles or near right angles.

[0003] In existing technologies, the longitudinal connecting section and the ground drain connector primarily use a threaded connection. Specifically, a thread is provided on the inner wall of the ground drain connector, and correspondingly, a matching external thread is provided on the outer wall of the adapter connecting section. During installation, the entire adapter is rotated to engage its external thread with the internal thread of the drain connector until it is tightened. However, once the threads are tightened, the overall circumferential orientation of the adapter, especially the orientation of its transverse drain interface section, is fixed. At this point, the drain interface section may not be facing the drain pipe, making it difficult or even impossible to connect the adapter to the drain pipe. Furthermore, the threaded connection method is relatively cumbersome. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a RV sewage adapter to solve the technical problem that the sewage adapter may cause difficulties or even failure to connect to the drain pipe after being connected to the sewage connector.

[0005] To solve the above-mentioned technical problems, the present invention provides a RV wastewater adapter, comprising: Right-angle bends include horizontal and vertical sections; A bushing is fitted onto the vertical section and rotatably connected to the vertical section. Several first protrusions are distributed circumferentially on the outer peripheral wall of the bushing. The upper and lower covers are respectively fitted onto the upper and lower ends of the vertical section; The support plate assembly is sleeved on the outer peripheral wall of the bushing and includes several fan-shaped support plates distributed circumferentially and connected to each other. Each fan-shaped support plate has an upper cover and a lower cover connected to its upper and lower ends, respectively. Each fan-shaped support plate has at least one first support surface and at least one second support surface distributed circumferentially on its inner wall. The first support surface is closer to the bushing in the radial direction than the second support surface. By rotating the bushing, the first protrusion faces the first support surface or the second support surface. When the first protrusion faces the first support surface, the first protrusion abuts against the first support surface and causes the fan-shaped support plate to open radially.

[0006] With the above structure, the RV sewage adapter of the present invention has the following advantages: When it needs to be connected to the ground sewage connector, the adapter's support plate assembly is inserted into the connector, and then the bushing is rotated. The first protrusion on the bushing rotates accordingly. When it rotates to face and abut against the first support surface of the inner wall of the fan-shaped support plate, since the first support surface is closer to the center of the bushing in the radial direction, the first protrusion will push the fan-shaped support plate radially outward, forcing the entire support plate assembly to expand outward, thereby tightly pressing it against the inner wall of the sewage connector, achieving reliable fastening; during this process, the right-angle elbow itself is not rotated, so the direction of its horizontal section can remain unchanged. It can be pre-aligned with the RV's drain pipe; if disassembly is required, the first protrusion is disengaged from the first support surface by rotating the bushing in the opposite direction, and the support plate assembly can be retracted, thus easily pulling out the adapter; it fundamentally solves the problem of "tightening means fixing the orientation" in the traditional threaded connection method. Users can first adjust the orientation of the horizontal section of the adapter to perfectly align it with the RV's drain pipe, and then independently complete the tight connection with the ground drain connector by rotating the bushing. Compared with the threaded connection, it greatly simplifies the installation process, ensures the reliability of the connection, and avoids the difficulty or even inability to connect the adapter and the drain pipe due to incorrect orientation.

[0007] As an improvement, a first connector is provided at one end of the fan-shaped support plate, and a second connector is provided at the other end. The first connector has a through groove, which includes a limiting part and an opening that are interconnected. The opening is located on the limiting part and away from the fan-shaped support plate. The width of the opening and the end closer to the limiting part is smaller than the width of the limiting part. The shape and size of the second connector match the through groove. The second connector is inserted into the through groove between adjacent fan-shaped support plates. With this structure, by setting a first connector with a through groove of a specific shape and a matching second connector, a quick and reliable connection between adjacent fan-shaped support plates is achieved. This connection method is easy to assemble and does not require complex tools or fasteners. The special design of the limiting part and the opening of the through groove allows the second connector to be easily inserted and effectively constrained, preventing the support plate assembly from falling apart or misaligning during the opening or closing process, and ensuring the stability and structural integrity of multiple fan-shaped support plates as a whole.

[0008] As an improvement, an annular rib is provided along the circumferential direction on the outer peripheral wall of the vertical section. The annular rib has a notch. The inner wall of the bushing is in contact with the annular rib. The inner wall of the bushing has a second protrusion located inside the notch. When the bushing is rotated so that the first protrusion faces the first support surface or the second support surface, the second protrusion abuts against the inner walls of the two sides of the notch respectively. With this structure, the cooperation between the annular rib and the notch, as well as the setting of the second protrusion, together constitute an effective and simple rotation limiting mechanism. The range of motion of the second protrusion within the notch precisely limits the rotation angle of the bushing, ensuring that the bushing can only switch between two predetermined positions where the first protrusion is accurately aligned with the first support surface (open state) or the second support surface (closed state). This prevents component damage or functional failure caused by excessive rotation of the bushing, and also enhances the stability of the axial connection between the bushing and the vertical section.

[0009] As an improvement, several annular ribs are distributed vertically at intervals on the outer peripheral wall of the vertical section, and several rows of first protrusions are provided on the outer peripheral wall of the bushing. These rows of first protrusions are distributed vertically at intervals, and several first protrusions in each row are circumferentially spaced. The annular ribs abut against the inner wall of the bushing corresponding to the rows of first protrusions. With this structure, by setting multiple annular ribs and multiple rows of first protrusions, and abutting the annular ribs against the corresponding inner wall areas of the bushing, multi-point and multi-layer support for the bushing is achieved. This structure significantly enhances the structural rigidity and stability of the bushing when subjected to radial expansion force, preventing the bushing from deforming or jamming due to uneven force. At the same time, the multi-row protrusion design can make the expansion force more evenly distributed along the height direction of the fan-shaped support plate, and the annular ribs support the position of the first protrusion, improving the smoothness of the tightening action and the stability of the connection with the inner wall of the drain connector.

[0010] As an improvement, a latch is connected to the upper end of the bushing. The latch is located inside the upper cover, and a through hole is provided on the outer peripheral wall of the upper cover. A lever is provided on the outer peripheral wall of the latch through the through hole. This structure provides users with a direct and effortless operating part. Users do not need to touch or rotate the bushing that is inconvenient to apply force to. They can rotate the latch by the lever, thereby driving the bushing to rotate. This greatly improves the user experience and makes the opening and closing operations more convenient and efficient.

[0011] As an improvement, the upper outer peripheral wall of the bushing is provided with several first protruding ribs spaced circumferentially, and the inner peripheral wall of the latch is provided with several second protruding ribs spaced circumferentially. The first protruding ribs and the second protruding ribs engage with each other. With this structure, the engagement of the first and second protruding ribs forms an efficient and reliable torque transmission structure between the latch and the bushing. This ensures that the rotational force generated when the user operates the lever is fully and without slippage transmitted to the bushing, avoiding slippage or free rotation during operation, and improving the controllability and reliability of operation.

[0012] As an improvement, a connecting plate is provided on the outer peripheral wall of the upper end of the vertical section. The upper surface of the connecting plate is provided with several grooves along the circumference. Several first buckles are provided on the inner wall of the upper end of the cover. The several first buckles are respectively engaged in the several grooves. The lower end of the cover abuts against the support plate assembly. The lower cover is connected to the lower end of the vertical section by bolts.

[0013] As an improvement, each fan-shaped support plate is equipped with a second buckle at both the upper and lower ends. The inner walls of the upper and lower covers are provided with several slots along the circumference, and the second buckles are connected to the slots respectively. With this structure, the support plate assembly is reliably positioned and connected between the upper and lower covers by the cooperation of the second buckles at the upper and lower ends of the fan-shaped support plate with the slots on the inner walls of the upper and lower covers, preventing it from moving up and down or falling off. At the same time, this buckle connection method does not interfere with the radial opening and closing movement of the support plate assembly, ensuring the normal realization of the core adjustment function while ensuring a stable connection.

[0014] As an improvement, the support plate assembly includes a first diameter section, a second diameter section, and a third diameter section from top to bottom. The outer diameters of the first, second, and third diameter sections decrease sequentially from top to bottom. Each sector-shaped support plate has a rubber-coated soft pad attached to its outer wall. With this structure, the different diameter sections can be adapted to different sizes of sewage connectors, expanding the applicability of the sewage adapter. Furthermore, the rubber-coated soft pad greatly enhances the friction and sealing between the soft pad and the inner wall of the sewage connector, preventing slippage or sewage leakage after connection. On the other hand, the soft material protects the inner wall of the sewage connector from scratches and has a certain tolerance, making installation smoother.

[0015] As an improvement, the horizontal and vertical sections are molded as a single piece; this structure avoids the accumulation of dirt at the connection between the separate horizontal and vertical sections. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0018] Figure 3 This is the front view of the present invention.

[0019] Figure 4 for Figure 3 Sectional view of section B.

[0020] Figure 5 for Figure 3 Sectional view of section C.

[0021] Figure 6 This is a schematic diagram of the right-angle elbow in this invention.

[0022] Figure 7 This is a schematic diagram of the connection structure between the fan-shaped support plate and the upper and lower covers in this invention.

[0023] Figure 8 This is a three-dimensional structural schematic diagram from another perspective of the present invention.

[0024] Figure 9 This is a schematic diagram of the bushing structure in this invention.

[0025] Reference numerals: 1. Right-angle elbow; 101. Horizontal section; 102. Vertical section; 2. Bushing; 3. First protrusion; 4. Upper cover; 5. Lower cover; 6. Fan-shaped support plate; 7. First support surface; 8. Second support surface; 9. First connector; 10. Second connector; 11. Limiting part; 12. Opening; 13. Annular rib; 14. Notch; 15. Second protrusion; 16. Lock; 17. Through hole; 18. Handle; 19. First rib; 20. Second rib; 21. Connecting plate; 22. Groove; 23. First buckle; 24. Bolt; 25. Second buckle; 26. Slot; 27. First diameter section; 28. Second diameter section; 29. ​​Third diameter section; 30. Rubber-coated soft pad. Detailed Implementation

[0026] The present invention provides a detailed description of a RV wastewater adapter in conjunction with the accompanying drawings.

[0027] like Figures 1 to 9 As shown, a RV wastewater adapter includes a right-angle elbow 1, a bushing 2, an upper cover 4, a lower cover 5, and a support plate assembly. The right-angle elbow 1 includes a horizontal section 101 and a vertical section 102, and as shown... Figure 6 As shown, the horizontal section 101 and the vertical section 102 are integrally formed. Compared with the separate connection structure of the horizontal section 101 and the vertical section 102 using threads, it can reduce the accumulation of dirt at the connection between the horizontal section 101 and the vertical section 102 and reduce the difficulty of cleaning.

[0028] like Figure 5 As shown, the bushing 2 is sleeved on the vertical section 102 and rotatably connected to the vertical section 102. Several first protrusions 3 are distributed circumferentially on the outer peripheral wall of the bushing 2; for example... Figure 1 As shown, the upper cover 4 and the lower cover 5 are respectively fitted onto the upper and lower ends of the vertical section 102; as Figure 5As shown, the support plate assembly is sleeved on the outer peripheral wall of the bushing 2 and includes several fan-shaped support plates 6 distributed circumferentially and connected to each other. The upper and lower ends of each fan-shaped support plate 6 are connected to the upper cover 4 and the lower cover 5, respectively. The inner wall of each fan-shaped support plate 6 has at least one first support surface 7 and at least one second support surface 8 distributed circumferentially. The first support surface 7 is closer to the bushing 2 in the radial direction than the second support surface 8. By rotating the bushing 2, the first protrusion 3 is made to face the first support surface 7 or the second support surface 8. When the first protrusion 3 faces the first support surface 7, the first protrusion 3 abuts against the first support surface 7 and causes the fan-shaped support plate 6 to be opened radially.

[0029] Specifically, such as Figure 1 and Figure 8 As shown, a connecting plate 21 is provided on the outer peripheral wall of the upper end of the vertical section 102. Several grooves 22 are provided on the upper surface of the connecting plate 21 along the circumferential direction. Several first buckles 23 are provided on the inner wall of the upper end of the upper cover 4. The several first buckles 23 are respectively engaged in the several grooves 22. The lower end of the upper cover 4 abuts against the support plate assembly. The lower cover 5 is connected to the lower end of the vertical section 102 by bolts 24. The bolts 24 pass through the bottom end of the lower cover 5 from bottom to top and are threadedly connected to the vertical section 102.

[0030] like Figure 7 As shown, each fan-shaped support plate 6 has a second buckle 25 at both the upper and lower ends. The inner walls of the upper cover 4 and the lower cover 5 are provided with several slots 26 along the circumference. The second buckles 25 are respectively connected to the slots 26. That is, the second buckle 25 at the upper end of the fan-shaped support plate 6 is connected to the slot 26 of the upper cover 4, and the second buckle 25 at the lower end is connected to the slot 26 of the lower cover 5.

[0031] like Figure 4 As shown, a latch 16 is connected to the upper end of the bushing 2. The latch 16 is located inside the upper cover 4. A through hole 17 is provided on the outer peripheral wall of the upper cover 4, and a lever 18 protruding through the through hole 17 is provided on the outer peripheral wall of the latch 16. Specifically, a plurality of first protruding ribs 19 are provided circumferentially at intervals on the outer peripheral wall of the upper end of the bushing 2, and a plurality of second protruding ribs 20 are provided circumferentially at intervals on the inner peripheral wall of the latch 16. The plurality of first protruding ribs 19 and the plurality of second protruding ribs 20 engage with each other. In this embodiment, the latch 16 is a semi-circular ring structure, which is embedded in the upper cover 4 and can rotate relative to the upper cover 4. Three second protruding ribs 20 are provided on the latch 16, and correspondingly, three first protruding ribs 19 are also provided on the bushing 2.

[0032] like Figure 7As shown, the support plate assembly includes, from top to bottom, a first diameter segment 27, a second diameter segment 28, and a third diameter segment 29. Correspondingly, each sector-shaped support plate 6 also includes a portion of the first diameter segment 27, the second diameter segment 28, and the third diameter segment 29. The outer diameters of the first diameter segment 27, the second diameter segment 28, and the third diameter segment 29 decrease sequentially from top to bottom. Each sector-shaped support plate 6 has an outer wall connected to a rubber-coated soft pad 30, and the outer wall of the rubber-coated soft pad 30 also has three different diameter segments. In this embodiment, the support plate assembly includes four sector-shaped support plates 6, and correspondingly, there are also four rubber-coated soft pads 30.

[0033] like Figure 5 and Figure 6 As shown, an annular rib 13 is provided along the circumferential direction on the outer peripheral wall of the vertical section 102. The annular rib 13 has a notch 14. The inner wall of the bushing 2 is in contact with the annular rib 13. The inner wall of the bushing 2 has a second protrusion 15. The second protrusion 15 is located inside the notch 14. When the bushing 2 is rotated so that the first protrusion 3 faces the first support surface 7 or the second support surface 8, the second protrusion 15 abuts against the inner walls of the two sides of the notch 14 respectively.

[0034] Furthermore, continue to refer to Figure 6 Several annular ribs 13 are distributed vertically at intervals on the outer perimeter of the vertical section 102, such as... Figure 9 As shown, the outer peripheral wall of the bushing 2 is provided with several rows of first protrusions 3, which are distributed vertically at intervals. In each row of first protrusions 3, several first protrusions 3 are distributed circumferentially at intervals. Several annular ribs 13 abut against the inner wall of the bushing 2 corresponding to the several rows of first protrusions 3. The first diameter segment 27, the second diameter segment 28, and the third diameter segment 29 each correspond to at least one row of first protrusions 3. In this embodiment, there are a total of six rows of first protrusions 3. The first diameter segment 27, the second diameter segment 28, and the third diameter segment 29 each correspond to two rows of first protrusions 3. Each row of first protrusions 3 has a total of eight circumferentially equidistant first protrusions 3. That is, in the same row of first protrusions 3, two first protrusions 3 correspond to one fan-shaped support plate 6. Correspondingly, two first support surfaces 7 and two second support surfaces 8 are provided in the same layer of the fan-shaped support plate 6.

[0035] like Figure 2 As shown, a first connector 9 is provided at one end of the fan-shaped support plate 6, and a second connector 10 is provided at the other end of the fan-shaped support plate 6. The first connector 9 is provided with a through groove, which includes a limiting part 11 and an opening part 12 that are interconnected. The opening part 12 is located on the limiting part 11 and on the side away from the fan-shaped support plate 6. The width of the end of the opening part 12 that is close to the limiting part 11 is smaller than the width of the limiting part 11. The shape and size of the second connector 10 match the through groove. Between adjacent fan-shaped support plates 6, the second connector 10 is inserted into the through groove. In this embodiment, the limiting part 11 is circular.

[0036] When connecting to the ground drain connector, insert the adapter's support plate assembly into the connector, then rotate the bushing 2. The first protrusion 3 on the bushing 2 rotates accordingly. When it rotates to face and abut against the first support surface 7 on the inner wall of the fan-shaped support plate 6, since the first support surface 7 is closer to the center of the bushing 2 radially, the first protrusion 3 will push the fan-shaped support plate 6 radially outward, forcing the entire support plate assembly to expand outward, thereby tightly pressing against the inner wall of the drain connector, achieving reliable fastening. During this process, the right-angle elbow 1 itself is not rotated, so the direction of its horizontal section 101 can remain unchanged, allowing for pre-alignment. RV drain pipe; if disassembly is required, reverse rotation of bushing 2 causes the first protrusion 3 to disengage from the first support surface 7, and the support plate assembly can retract, thus easily pulling out the adapter; fundamentally solves the problem of "tightening means fixing the orientation" in traditional threaded connection methods. Users can first adjust the orientation of the horizontal section 101 of the adapter to perfectly align it with the RV drain pipe, and then independently complete the tight connection with the ground drain connector by rotating bushing 2. This greatly simplifies the installation process, ensures the reliability of the connection, and avoids difficulties or even inability to connect the adapter and the drain pipe due to incorrect orientation.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A RV wastewater adapter, characterized in that, include: The right-angle bend (1) includes a horizontal section (101) and a vertical section (102). A bushing (2) is fitted onto the vertical section (102) and rotatably connected to the vertical section (102). Several first protrusions (3) are distributed circumferentially on the outer peripheral wall of the bushing (2). The upper cover (4) and the lower cover (5) are respectively fitted onto the upper and lower ends of the vertical section (102); The support plate assembly is sleeved on the outer peripheral wall of the bushing (2) and includes several fan-shaped support plates (6) distributed circumferentially and connected to each other. The upper and lower ends of each fan-shaped support plate (6) are respectively connected to the upper cover (4) and the lower cover (5). The inner wall of each fan-shaped support plate (6) has at least one first support surface (7) and at least one second support surface (8) distributed circumferentially. The first support surface (7) is closer to the bushing (2) in the radial direction than the second support surface (8). By rotating the bushing (2), the first protrusion (3) is made to face the first support surface (7) or the second support surface (8). When the first protrusion (3) faces the first support surface (7), the first protrusion (3) abuts against the first support surface (7) and makes the fan-shaped support plate (6) open radially.

2. The RV wastewater adapter according to claim 1, characterized in that, The fan-shaped support plate (6) has a first connector (9) at one end and a second connector (10) at the other end. The first connector (9) has a through groove. The through groove includes a limiting part (11) and an opening part (12) that are connected to each other. The opening part (12) is located on the limiting part (11) and away from the fan-shaped support plate (6). The width of the opening part (12) and the end closest to the limiting part (11) is smaller than the width of the limiting part (11). The shape and size of the second connector (10) match the through groove. The second connector (10) is inserted into the through groove between adjacent fan-shaped support plates (6).

3. The RV wastewater adapter according to claim 1, characterized in that, The vertical section (102) has an annular rib (13) along its circumferential direction on its outer peripheral wall. The annular rib (13) has a notch (14). The inner wall of the bushing (2) is in contact with the annular rib (13). The inner wall of the bushing (2) has a second protrusion (15). The second protrusion (15) is located inside the notch (14). When the bushing (2) is rotated so that the first protrusion (3) faces the first support surface (7) or the second support surface (8), the second protrusion (15) abuts against the inner walls of both sides of the notch (14).

4. The RV wastewater adapter according to claim 1, characterized in that, The outer peripheral wall of the vertical section (102) is provided with a number of annular ribs (13) at vertical intervals. The outer peripheral wall of the bushing (2) is provided with a number of rows of first protrusions (3). The number of rows of first protrusions (3) are distributed at vertical intervals. The number of first protrusions (3) in each row of first protrusions (3) are distributed at circumferential intervals. The number of annular ribs (13) respectively abut against the inner wall of the bushing (2) corresponding to the number of rows of first protrusions (3).

5. The RV wastewater adapter according to claim 1, characterized in that, The upper end of the bushing (2) is connected to a buckle (16), the buckle (16) is located inside the upper cover (4), the outer peripheral wall of the upper cover (4) is provided with a through hole (17), and the outer peripheral wall of the buckle (16) is provided with a lever (18) exposed through the through hole (17).

6. The RV wastewater adapter according to claim 5, characterized in that, The upper outer peripheral wall of the bushing (2) is provided with a number of first protruding ribs (19) spaced apart along the circumferential direction, and the inner peripheral wall of the latch (16) is provided with a number of second protruding ribs (20) spaced apart along the circumferential direction. The number of first protruding ribs (19) and the number of second protruding ribs (20) engage with each other.

7. The RV wastewater adapter according to claim 1, characterized in that, A connecting plate (21) is provided on the outer peripheral wall of the upper end of the vertical section (102). The upper surface of the connecting plate (21) is provided with a plurality of grooves (22) along the circumferential direction. The inner wall of the upper end of the upper cover (4) is provided with a plurality of first buckles (23). The plurality of first buckles (23) are respectively engaged in the plurality of grooves (22). The lower end of the upper cover (4) abuts against the support plate assembly. The lower cover (5) is connected to the lower end of the vertical section (102) by bolts (24).

8. The RV wastewater adapter according to claim 1, characterized in that, Each of the fan-shaped support plates (6) is provided with a second buckle (25) at both the upper and lower ends. The inner wall of the upper cover (4) and the inner wall of the lower cover (5) are provided with a number of slots (26) along the circumference. The number of second buckles (25) are respectively connected in the number of slots (26).

9. The RV wastewater adapter according to claim 1, characterized in that, The support plate assembly includes a first diameter segment (27), a second diameter segment (28), and a third diameter segment (29) from top to bottom. The outer diameters of the first diameter segment (27), the second diameter segment (28), and the third diameter segment (29) decrease from top to bottom. Each fan-shaped support plate (6) has an adhesive-coated soft pad (30) connected to its outer wall.

10. The RV wastewater adapter according to claim 1, characterized in that, The horizontal section (101) and the vertical section (102) are integrally formed.

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