Drainage pipe fitting

Abstract

The utility model discloses a drainage pipe fitting which comprises a pipe fitting main body and an insertion end, the pipe fitting main body is connected with the insertion end in a sleeved mode, the pipe fitting main body is connected with the insertion end in a rotating mode, a matched limiting piece is arranged on the pipe fitting main body, an insertion limiting piece is arranged on the insertion end, and the matched limiting piece is connected with the insertion limiting piece in a clamped mode. According to the pipe fitting, the pipe fitting main body and the insertion end are arranged in a split mode, the pipe fitting main body and the insertion end are connected in a sleeving mode, and the pipe fitting main body and the insertion end can rotate relatively. Wherein a matching limiting piece is arranged on the pipe fitting main body, an insertion limiting piece is relatively arranged on the insertion end, and the matching limiting piece and the insertion limiting piece can be correspondingly matched and connected, so that a connecting node exists in the process of movably connecting the pipe fitting main body and the insertion end; and the pipe fitting main body and the insertion end can be fixed and limited.

Description

Technical Field

[0001] The utility model relates to the technical field of water pipes, in particular to a drainage pipe fitting. Background Art

[0002] With the increase of population and economic development in my country, the quality of life of residents has improved, and the requirements for home decoration have also increased. In the process of home decoration, domestic water drainage outlets will be reserved in the layout of balconies and bathrooms to connect indoor drainage treatment mechanisms or other drainage accessories such as floor drains. This part is the main discharge outlet for domestic water and is used most frequently. Although with the development of waterproofing technology, there will still be accumulation of domestic water due to untimely drainage or drainage blockage. In the long run, it is easy to breed bacteria and produce odor.

[0003] For example, the publication number "CN215406342U" discloses "a pre-buried double-riser same-floor drainage pipe system", including a riser assembly, a centralized water-seal floor drain assembly and a water-free floor drain assembly. The riser assembly includes an expansion joint, a drainage riser and an exhaust pipe. The centralized water-seal floor drain assembly includes a floor drain assembly and a water seal assembly from top to bottom. The floor drain assembly and the water seal assembly are connected through a first adjustment member. The first adjustment member includes a first adjustment ring with multiple axes overlapping and superimposed. One end of the first flat tube is connected and communicated with the pipe body of the drainage riser, and the other end of the first flat tube is connected and communicated with the outer wall of the water seal assembly. One end of the second flat tube is connected and communicated with the outer wall of the water seal assembly, and the other end of the second flat tube is connected and communicated with the water-free floor drain assembly. However, in actual applications, since drainage pipe fittings mostly adopt an integrated connection structure, disassembly is inconvenient and subsequent maintenance is not convenient. Summary of the invention

[0004] In view of the problem of inconvenient disassembly of the prior art mentioned in the background technology, the utility model provides a drainage pipe fitting, which can improve the flexible disassembly of the drainage pipe fitting, thereby improving the convenience of subsequent maintenance.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions.

[0006] A drainage pipe fitting includes a pipe fitting body and an insertion end, wherein the pipe fitting body is sleeved with the insertion end, the pipe fitting body is rotatably connected to the insertion end, a matching limiter is provided on the pipe fitting body, an insertion limiter is provided on the insertion end, and the matching limiter is snap-connected to the insertion limiter. In the present application, the pipe fitting body and the insertion end are separately provided, and are connected by sleeved connection between the pipe fitting body and the insertion end, so that the pipe fitting body and the insertion end can rotate relative to each other. A matching limiter is provided on the pipe fitting body, and an insertion limiter is relatively provided on the insertion end, wherein the matching limiter and the insertion limiter can be matched and connected accordingly, so that in the process of active connection between the pipe fitting body and the insertion end, there is a connection node, which can fix and limit the pipe fitting body and the insertion end. The stability of the connection is ensured, and the pipe fitting body can be flexibly disassembled and repaired during later use, which improves convenience. The matching limiters and insertion limiters include but are not limited to various types of snap-fit ​​connection settings, such as slot snap connection, jack and rod connection, barb connection and other connection methods, as long as the limit fixation of the pipe body and the insertion end can be achieved.

[0007] Preferably, the matching limiter includes a rotation limiter groove, the insertion limiter includes an insertion buckle adapted to the rotation limiter groove, and the rotation limiter groove is snap-connected to the insertion buckle. The matching limiter is a rotation limiter groove, which is a groove-like structure, and the insertion limiter arranged on the insertion end is an insertion buckle structure, wherein the shape of the insertion buckle can be adapted to connect to the rotation limiter groove, thereby achieving snap-connection and ensuring stability.

[0008] Preferably, the rotation limit groove is provided with a matching rib, and the insertion buckle is provided with a connecting rib. When the rotation limit groove is engaged and connected to the insertion limiter, the matching rib is engaged with the connecting rib. The rotation limit groove is provided with a matching rib, and the insertion buckle is provided with a connecting rib, wherein the connecting rib can be engaged with the matching rib, that is, when the insertion buckle is engaged and connected to the rotation limit groove, the connecting rib and the matching rib are hooked to prevent them from coming out.

[0009] Preferably, the connecting ribs and the matching ribs are both arranged obliquely. The connecting ribs and the matching ribs are arranged obliquely, which can avoid excessive stagnation during the engagement process and improve the smoothness of the engagement and disengagement process.

[0010] Preferably, the matching ribs are provided with a plurality of bars, the connecting ribs are provided with a plurality of bars, and the matching ribs and the connecting ribs are staggered and connected. A plurality of matching ribs are provided, and a plurality of connecting ribs are also provided. During the connection process, the matching ribs and the connecting ribs are staggered, so as to ensure the stability of the connection.

[0011] Preferably, the insertion end includes a mudguard, the pipe body includes a socket end and a mating end, the mudguard is arranged at the bottom of the socket end, the mating end is connected to the insertion end, a mating limiter is arranged at the bottom of the socket end, and an insertion limiter is arranged on the end face of the mudguard close to the socket end. The insertion end includes a mudguard, wherein the pipe body includes a socket end and a mating end, wherein the socket end is arranged above the mating end, and the mating end is matingly connected with the insertion end, so that the mudguard is located at the bottom position of the socket end, so the mudguard is arranged close to the bottom of the socket end, the mating limiter is arranged at the bottom of the socket end, and the insertion limiter is arranged on the end face of the mudguard close to the socket end, so as to achieve a reliable connection, wherein the mudguard can prevent cement or other blockages generated during construction from clogging the pipeline during installation, thereby affecting the drainage effect.

[0012] Preferably, the insertion end includes a connecting column, a water absorbing plate is connected to the connecting column, a limiting piece is arranged on the connecting column, the water absorbing plate is connected to the limiting piece, and a water seepage gap is left between the water absorbing plate and the connecting column. A connecting column is arranged on the insertion end, wherein the connecting column is connected to the water absorbing plate, the water absorbing plate includes but is not limited to water absorbing materials such as wool felt, and a limiting piece is arranged on the connecting column, so that a water seepage gap is left between the connecting column and the water absorbing plate, so that the accumulated water that penetrates into the cement layer can be absorbed by the water absorbing plate and then discharged from the water seepage gap.

[0013] Preferably, the insertion end includes a fender, the limiting member is an insertion matching rib arranged near one side of the fender, the water absorbing plate includes a sleeve inner ring near one side of the connecting column, and the sleeve inner ring abuts against the insertion matching rib. The limiting member is an insertion matching rib arranged on the connecting column, wherein the insertion matching member is arranged near one side of the fender, so as to ensure that the water absorbing plate fully absorbs the seepage water and ensure the stability of the fixing of the water absorbing plate.

[0014] Preferably, the insertion end includes a connecting column, and a plurality of guide ribs are arranged on the connecting column. The connecting column is provided with guide ribs, wherein the guide ribs can guide the seepage water, thereby achieving the effect of secondary drainage.

[0015] Preferably, the end of the guide rib is provided with a guide rib. The guide rib is provided at the end of the guide rib, wherein the shape of the guide rib includes but is not limited to an oblique rib and an arc rib, so as to ensure smoothness during installation.

[0016] The beneficial effects of the utility model are as follows:

[0017] (1) It can improve the flexibility of disassembly of drainage pipe fittings, thereby improving the convenience of later maintenance;

[0018] (2) It can improve the protection of the inside of the pipeline during construction and avoid interference from foreign matter;

[0019] (3) It can absorb and discharge accumulated water, forming a secondary drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of the utility model.

[0021] Figure 2 yes Figure 1 Partial axonometric view of the middle limit fitting.

[0022] Figure 3 yes Figure 1 Insert a partial axonometric view of the mating part.

[0023] Figure 4 yes Figure 1 Front view of the middle pipe body.

[0024] Figure 5 yes Figure 1 Front view of the insertion end.

[0025] Figure 6 It is a sectional axonometric drawing of the utility model.

[0026] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle.

[0027] In the figure:

[0028] 1 pipe fitting body, 11 matching limiting piece, 111 rotation limiting groove, 112 matching rib position, 12 socket end, 13 matching end;

[0029] 2 insertion end, 21 insertion limiter, 211 insertion buckle, 212 connection rib position, 22 fender, 23 connection column, 231 limiter, 232 water seepage gap, 233 insertion matching rib, 234 guide rib, 235 guide rib position;

[0030] 3 water absorption plate, 31 sleeved inner ring. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Embodiment 1:

[0033] like Figure 1As shown, a drainage pipe fitting includes a pipe fitting body 1 and an insertion end 2, the pipe fitting body 1 is sleeved with the insertion end 2, the pipe fitting body 1 and the insertion end 2 are rotatably connected, a matching limiter 11 is provided on the pipe fitting body 1, and an insertion limiter 21 is provided on the insertion end 2, and the matching limiter 11 is engaged and connected with the insertion limiter 21. In the present application, the pipe fitting body 1 and the insertion end 2 are separately provided, and are connected by sleeved connection between the pipe fitting body 1 and the insertion end 2, and the pipe fitting body 1 and the insertion end 2 can rotate relative to each other. A matching limiter 11 is provided on the pipe fitting body 1, and an insertion limiter 21 is provided on the insertion end 2, wherein the matching limiter 11 and the insertion limiter 21 can be matched and connected accordingly, so that in the process of active connection between the pipe fitting body 1 and the insertion end 2, there is a connection node, which can fix and limit the pipe fitting body 1 and the insertion end 2. The stability of the connection is ensured, and the pipe fitting body 1 can be flexibly disassembled and repaired during later use, which improves convenience. The matching limiter 11 and the insertion limiter 21 include but are not limited to various types of snap-fit ​​connection settings, such as slot snap connection, jack and rod connection, barb connection and other connection methods, as long as the limit fixation of the pipe body 1 and the insertion end 2 can be achieved.

[0034] like Figure 2 , 3 As shown, the matching limiter 11 includes a rotation limiter groove 111, and the insertion limiter 21 includes an insertion buckle 211 adapted to the rotation limiter groove 111, and the rotation limiter groove 111 is engaged with the insertion buckle 211. The rotation limiter groove 111 is provided with a matching rib position 112, and the insertion buckle 211 is provided with a connecting rib position 212. When the rotation limiter groove 111 is engaged with the insertion limiter 21, the matching rib position 112 is engaged with the connecting rib position 212. The connecting rib position 212 and the matching rib position 112 are both obliquely arranged. There are a plurality of matching rib positions 112, and there are a plurality of connecting rib positions 212, and each matching rib position 112 is staggeredly connected with the connecting rib position 212.

[0035] The mating stopper 11 is a rotation stopper groove 111, which is a groove-like structure, and the insertion stopper 21 arranged on the insertion end 2 is an insertion buckle 211 structure, wherein the shape of the insertion buckle 211 can be adapted to connect the rotation stopper groove 111, thereby realizing a snap connection and ensuring stability. A mating rib 112 is arranged on the rotation stopper groove 111, and a connecting rib 212 is arranged on the insertion buckle 211, wherein the connecting rib 212 can be snapped with the mating rib 112, that is, after the insertion buckle 211 is snapped and connected with the rotation stopper groove 111, the connecting rib 212 and the mating rib 112 are hooked to avoid slipping out. The connecting rib 212 and the mating rib are only arranged obliquely, which can avoid excessive stagnation effect during the snapping process and improve the smoothness of the snapping and slipping process. A plurality of matching ribs 112 are provided, and a plurality of connecting ribs 212 are also provided. During the connection process, the matching ribs 112 and the connecting ribs 212 are staggered to ensure the stability of the connection.

[0036] like Figure 1 , 4 As shown, the insertion end 2 includes a fender 22, the pipe body 1 includes a socket end 12 and a mating end 13, the fender 22 is arranged at the bottom of the socket end 12, the mating end 13 is connected to the insertion end 2, the mating stopper 11 is arranged at the bottom of the socket end 12, and the insertion stopper 21 is arranged on the end face of the fender 22 close to the socket end 12. The insertion end 2 includes a fender 22, wherein the pipe body 1 includes a socket end 12 and a mating end 13, wherein the socket end 12 is arranged above the mating end 13, and the mating end 13 is matingly connected with the insertion end 2, so that the fender 22 is located at the bottom position of the socket end 12, so the fender 22 is arranged close to the bottom of the socket end 12, the mating stopper 11 is arranged at the bottom of the socket end 12, and the insertion stopper 21 is arranged on the end face of the fender 22 close to the socket end 12, so as to achieve a reliable connection.

[0037] The assembly and working process of the drainage pipe fitting in this embodiment are as follows: In this embodiment, the drainage pipe fitting is divided into two parts, namely a pipe fitting body 1 and an insertion end 2, wherein the insertion end 2 and the main part of the pipe fitting body 1 are both cylindrical structures, and the pipe fitting body 1 includes a socket end 12 and a mating end 13. In this embodiment, the socket end 12 and the mating end 13 are an integrally formed structure, wherein in this embodiment, the pipe fitting body 1 is sleeved on the insertion end 2, and the mating end 13 is located below the socket end 12. Specifically, in this embodiment, the mating end 13 is matingly connected with the insertion end 2, wherein the mating end 13 has a smaller diameter than the socket end 12, and the mating end 13 is adapted to the inner diameter of the insertion end 2. Furthermore, in this embodiment, after the pipe fitting body 1 is sleeved on the insertion end 2, the two can rotate freely, so a mating limiter 11 is provided on the pipe fitting body 1, and An insertion limiter 21 is provided on the insertion end 2. Furthermore, in the present embodiment, the mating limiter 11 is provided on the socket end 12, specifically, at the bottom position of the socket end 12, and the bottom position of the socket end 12 is an end close to the insertion end 2. In the present embodiment, the mating limiter 11 is provided at the bottom of the socket end 12, that is, on the side close to the insertion end 2, wherein a fender 22 is provided on the insertion end 2, wherein the fender 22 includes an end face close to the side of the socket end 12, and the insertion limiter 21 is provided on the end face. Therefore, when the pipe fitting body 1 is sleeved onto the insertion end 2, the mating limiter 11 and the insertion limiter 21 are in the same horizontal position. At this time, the pipe fitting body 1 and the insertion end 2 are rotated so that the mating limiter 11 and the insertion limiter 21 are engaged and connected together, thereby achieving a fixed restraining effect on the pipe fitting body 1.

[0038] In this embodiment, the matching limit member 11 is a limit groove structure, which is a rotation limit groove 111 in this embodiment. The corresponding insertion limit member 21 is a snap-on structure, which is an insertion buckle 211 in this embodiment. The shape of the insertion buckle 211 is adapted to the shape of the rotation limit groove 111. Further, in this embodiment, a matching rib position 112 is arranged on the rotation limit groove 111, wherein the matching rib position 112 is an obliquely arranged rib position. Similarly, a connecting rib position adapted to the matching rib position 112 is also arranged on the insertion buckle 211, and the setting shape of the connecting rib position 212 is also an oblique setting. In this embodiment, a plurality of connecting rib positions 212 and matching rib positions 112 are arranged, and each connecting rib position 212 and matching rib position 112 are staggered, so as to connect and fasten the pipe body 1 and the insertion end 2.

[0039] Embodiment 2:

[0040] like Figure 5 , 6As shown in FIG. 7 , in this embodiment, the insertion end 2 includes a connecting column 23, the connecting column 23 is connected to the water absorbing plate 3, a limiting member 231 is arranged on the connecting column 23, the water absorbing plate 3 is connected to the limiting member 231, and a water seepage gap 232 is left between the water absorbing plate 3 and the connecting column 23. The connecting column 23 is arranged on the insertion end 2, wherein the connecting column 23 is connected to the water absorbing plate 3, the water absorbing plate 3 includes but is not limited to water-absorbent materials such as wool felt, and the limiting member 231 is arranged on the connecting column 23, so that a water seepage gap 232 is left between the connecting column 23 and the water absorbing plate 3, so that the accumulated water infiltrated into the cement layer can be discharged from the water seepage gap 232 after being absorbed by the water absorbing plate 3.

[0041] like Figure 5 , 6 As shown in Figures 7 and 8, the insertion end 2 includes a fender 22, the limiting member 231 is an insertion matching rib 234 arranged near one side of the fender 22, and the water absorbing plate 3 includes a sleeve inner ring 31 near one side of the connecting column 23, and the sleeve inner ring 31 abuts against the insertion matching rib 234. The limiting member 231 is an insertion matching rib 234 arranged on the connecting column 23, wherein the insertion matching member is arranged near one side of the fender 22, so as to ensure that the water absorbing plate 3 fully absorbs the seepage water and ensures the stability of the fixing of the water absorbing plate 3.

[0042] like Figure 5 As shown, the insertion end 2 includes a connecting column 23, and a plurality of guide ribs 234 are arranged on the connecting column 23. A guide rib position 235 is arranged at the end of the guide rib 234. The guide rib 234 is arranged on the connecting column 23, wherein the guide rib 234 can guide the seepage water, thereby achieving the effect of secondary drainage. A guide rib position 235 is arranged at the end of the guide rib 234, wherein the shape of the guide rib position 235 includes but is not limited to an oblique rib position and an arc rib position, thereby ensuring the smoothness during the installation process.

[0043] The assembly and working process of the drainage pipe fittings in this embodiment are as follows: In this embodiment, a water absorption plate 3 is connected to the insertion end 2, and the water absorption plate 3 is an annular structure. The insertion end 2 includes a connecting column 23, and the water absorption plate 3 is sleeved on the connecting column 23. The water absorption plate 3 includes a sleeve inner ring 31. In this embodiment, a limiting member 231 is provided on the connecting column 23, so that a water seepage gap 232 is left between the sleeve inner ring 31 and the connecting column 23. In this embodiment, the limiting member 231 is an insertion matching rib 234 circumferentially arranged on the connecting column 23. When the water absorption plate 3 is connected to the connecting column 23, the sleeve inner ring 31 abuts against the insertion matching rib 234, so that a water seepage gap 232 is left between the sleeve inner ring 31 and the connecting column 23, so that the accumulated water that penetrates into the cement layer can be discharged from the water seepage gap 232 after being absorbed by the water absorption plate 3.

[0044] Furthermore, in the present embodiment, guide ribs 234 are provided on the connecting column 23 . The guide ribs 234 are distributed along the circumferential direction. The guide ribs 234 can guide the accumulated water flowing out of the water seepage gap 232 , thereby playing a role of secondary drainage.

[0045] Furthermore, in the present embodiment, there is also included a pipe fitting body 1 which is connected to the insertion end 2, wherein the insertion end 2 of the pipe fitting body 1 and the main body of the pipe fitting body 1 are both cylindrical structures, and the pipe fitting body 1 includes a socket end 12 and a matching end 13, and in the present embodiment, the socket end 12 and the matching end 13 are an integrally formed structure, wherein in the present embodiment, the pipe fitting body 1 is sleeved on the insertion end 2, and the matching end 13 is located below the socket end 12, and specifically in the present embodiment, the matching end 13 is connected to the insertion end 2, wherein the matching end 13 has a smaller diameter than the socket end 12, and the matching end 13 is adapted to the inner diameter of the insertion end 2, and further, in the present embodiment, since the pipe fitting body 1 is sleeved on the insertion end 2, the two can rotate freely, and therefore a matching limiter 11 is provided on the pipe fitting body 1, and a Insert the limit piece 21. Further, in the present embodiment, the matching limit piece 11 is arranged on the socket end 12, specifically, at the bottom position of the socket end 12, and the bottom position of the socket end 12 is the end close to the insertion end 2. In the present embodiment, the matching limit piece 11 is arranged at the bottom of the socket end 12, that is, on the side close to the insertion end 2, wherein a fender 22 is arranged on the insertion end 2, wherein the fender 22 includes an end face close to the side of the socket end 12, and the insertion limit piece 21 is arranged on the end face. Therefore, when the pipe fitting body 1 is sleeved on the insertion end 2, the matching limit piece 11 and the insertion limit piece 21 are in the same horizontal position. At this time, the pipe fitting body 1 and the insertion end 2 are rotated so that the matching limit piece 11 and the insertion limit piece 21 are engaged and connected together, thereby achieving a fixed constraint effect on the pipe fitting body 1.

[0046] In this embodiment, the matching limit member 11 is a limit groove structure, which is a rotation limit groove 111 in this embodiment. The corresponding insertion limit member 21 is a snap-on structure, which is an insertion buckle 211 in this embodiment. The shape of the insertion buckle 211 is adapted to the shape of the rotation limit groove 111. Further, in this embodiment, a matching rib position 112 is arranged on the rotation limit groove 111, wherein the matching rib position 112 is an obliquely arranged rib position. Similarly, a connecting rib position adapted to the matching rib position 112 is also arranged on the insertion buckle 211, and the setting shape of the connecting rib position 212 is also an oblique setting. In this embodiment, a plurality of connecting rib positions 212 and matching rib positions 112 are arranged, and each connecting rib position 212 and matching rib position 112 are staggered, so as to connect and fasten the pipe body 1 and the insertion end 2.

Claims

1. A drainage pipe fitting, characterized in that: The invention comprises a pipe fitting body (1) and an insertion end (2), wherein the pipe fitting body (1) is sleeved with the insertion end (2), the pipe fitting body (1) and the insertion end (2) are rotatably connected, the pipe fitting body (1) is provided with a matching limiter (11), the insertion end (2) is provided with an insertion limiter (21), and the matching limiter (11) is snap-connected with the insertion limiter (21).

2. A drainage pipe fitting according to claim 1, characterized in that: The matching limiting member (11) comprises a rotation limiting groove (111), the insertion limiting member (21) comprises an insertion buckle (211) adapted to the rotation limiting groove (111), and the rotation limiting groove (111) is snap-connected to the insertion buckle (211).

3. A drainage pipe fitting according to claim 2, characterized in that: The rotation limiting groove (111) is provided with a matching rib (112), and the insertion buckle (211) is provided with a connecting rib (212); when the rotation limiting groove (111) is engaged and connected to the insertion limiting member (21), the matching rib (112) is engaged with the connecting rib (212).

4. A drainage pipe fitting according to claim 3, characterized in that: The connecting ribs (212) and the matching ribs (112) are both arranged obliquely.

5. A drainage pipe fitting according to claim 3, characterized in that: A plurality of matching ribs (112) are provided, and a plurality of connecting ribs (212) are provided, and each matching rib (112) and connecting rib (212) are staggeredly connected.

6. A drainage pipe fitting according to claim 1, characterized in that: The insertion end (2) includes a fender (22), and the pipe body (1) includes a socket end (12) and a mating end (13). The fender (22) is arranged at the bottom of the socket end (12), and the mating end (13) is connected to the insertion end (2). A mating limiter (11) is arranged at the bottom of the socket end (12), and an insertion limiter (21) is arranged on the end surface of the fender (22) close to the socket end (12).

7. A drainage pipe fitting according to any one of claims 1 to 6, characterized in that: The insertion end (2) comprises a connecting column (23), a water absorbing plate (3) is connected to the connecting column (23), a limiting member (231) is arranged on the connecting column (23), the water absorbing plate (3) is connected to the limiting member (231), and a water seepage gap (232) is left between the water absorbing plate (3) and the connecting column (23).

8. A drainage pipe fitting according to claim 7, characterized in that: The limiting member (231) is an insert fitting rib (233) arranged close to one side of the fender (22); the water absorbing plate (3) comprises a sleeve inner ring (31) close to one side of the connecting column (23); the sleeve inner ring (31) abuts against the insert fitting rib (233).

9. A drainage pipe fitting according to any one of claims 1 to 6, characterized in that: The insertion end (2) comprises a connecting column (23), and a plurality of guide ribs (234) are arranged on the connecting column (23).

10. A drainage pipe fitting according to claim 9, characterized in that: A guide rib position (235) is provided at the end of the guide rib (234).

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