Shower control box

Abstract

The present invention discloses a shower control box, a box body, a valve body assembly and a button assembly, the box body is provided with a mounting hole, the valve body assembly is arranged in the box body, the valve body assembly is provided with a valve core, the valve core is connected with a mounting piece, the button assembly is inserted into the mounting hole and can move relative to the box body along the axial direction of the mounting hole, the button assembly is provided with a through hole, the end of the mounting piece away from the valve core is a connecting end, the connecting end passes through the through hole along the axial direction of the mounting hole and is connected to the button assembly, so that the button assembly can drive the valve core to move axially along the mounting hole, a first gap exists between the mounting piece and the through hole in the radial direction, and a second gap exists between the button assembly and the end of the mounting piece away from the valve core and / or the valve core in the axial direction of the mounting hole. In the present invention, when the valve body assembly is installed offset, the button assembly will not get stuck or shake when pressed, and it can ensure that the button assembly is smoother when pressed.

Description

Technical Field

[0001] The invention relates to the technical field of shower appliances, in particular to a shower control box. Background Art

[0002] The existing shower control box is provided with a plurality of buttons on the outside, so that the user can control the water circuit through the buttons, so as to control the working mode of the shower head when taking a shower. However, since the buttons are directly connected to the valve core of the valve body assembly in the shower control box, when the valve body assembly is installed, it is easy to cause the buttons to get stuck or shake when in use when the buttons are used. Summary of the invention

[0003] The purpose of the present invention is to provide a shower control box so that buttons will not get stuck during use and can be pressed more smoothly.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A shower control box, comprising:

[0006] A box body, wherein the box body is provided with a mounting hole;

[0007] A valve body assembly, the valve body assembly is arranged in the box body, the valve body assembly is provided with a valve core, and the valve core is connected to a mounting piece;

[0008] A button assembly, wherein the button assembly is inserted into the mounting hole and can move axially along the mounting hole relative to the box body. A through hole is provided on the button assembly, and the end of the mounting piece away from the valve core is a connecting end. The connecting end passes through the through hole along the axial direction of the mounting hole and is connected to the button assembly, so that the button assembly can drive the valve core to move axially along the mounting hole. A first gap exists between the mounting piece and the through hole in the radial direction, and a second gap exists between the button assembly and the connecting end of the mounting piece and / or the valve core in the axial direction of the mounting hole.

[0009] Preferably, the button assembly includes a button body and a connecting part connected together, the through hole is located on the connecting part, the mounting piece is a columnar structure, the outer diameter of the connecting end of the mounting piece is larger than the inner diameter of the through hole, and the second gap exists between the connecting part and the connecting end of the mounting piece and / or the valve core along the axial direction of the mounting hole.

[0010] Preferably, the mounting member is a connecting bolt, a positioning step is provided on the outer periphery of the connecting bolt, the connecting bolt passes through the through hole and is threadedly connected to the valve core, and the positioning step is tightly pressed against the valve core.

[0011] Preferably, the connecting portion includes a gasket and a sealing ring, the through hole is located on the gasket, the sealing ring is sleeved outside the gasket, the button body is cylindrical, the gasket is arranged in the button body, and the sealing ring is interference fit with the inner wall of the button body.

[0012] Preferably, a side of the gasket close to the button body is provided with a stop protrusion abutting against a side of the inside of the button body away from the opening.

[0013] Preferably, it further comprises a limiting member connected to the box body and located at the mounting hole, the limiting member comprises a limiting protrusion, a limiting groove is axially provided on the outer side of the button assembly, and the limiting protrusion penetrates into the limiting groove.

[0014] Preferably, the limiting member further includes a clamping ring, which is connected to the inner circumference of the mounting hole, and the clamping ring extends inward to form the limiting protrusion, the button assembly is inserted into the clamping ring, and the limiting protrusion is inserted into the limiting groove.

[0015] Preferably, the clamping ring has two limiting protrusions evenly distributed along the circumferential direction, and the button assembly has two limiting grooves evenly distributed along the circumferential direction, and the two limiting protrusions enter into the two limiting grooves correspondingly.

[0016] Preferably, a connecting seat is provided on the inner side of the box body and in an area corresponding to the mounting hole, a connecting hole corresponding to the mounting hole is provided on the connecting seat, a bayonet connected to the connecting hole is provided on the connecting seat, the clamping ring extends outward to form a clamping block, and the clamping block enters the bayonet.

[0017] Preferably, the clamping ring has two clamping blocks evenly distributed along the circumferential direction, and the connecting seat has two clamping openings evenly distributed along the circumferential direction, and the two clamping blocks enter into the two clamping openings correspondingly.

[0018] Compared with the prior art, the shower control box according to the embodiment of the present invention has the following beneficial effects:

[0019] In the present invention, the button assembly is inserted into the mounting hole and can move relative to the box body along the axial direction of the mounting hole. The end of the mounting piece away from the valve core passes through the through hole along the axial direction of the mounting hole and is connected to the button assembly, so that the button assembly can drive the valve core to move axially along the mounting hole, so that the button assembly can control the opening and closing of the valve core. Then, due to the first gap between the mounting piece and the through hole in the radial direction, a second gap exists between the button assembly and the end of the mounting piece away from the valve core and / or the valve core in the axial direction of the mounting hole, that is, the valve body assembly The component can have a certain displacement relative to the button assembly in the radial and axial directions along the mounting hole, so that the valve body assembly can have a certain offset in space relative to the button assembly. By utilizing the above-mentioned radial and axial gaps, the position adjustment demand caused by the displacement of the valve body assembly after installation can be met. Therefore, when the position of the valve body assembly installed in the box body is offset, the valve body assembly will not cause the button assembly to shake, and part of the button assembly will not be pressed against the inner wall of the mounting hole, thereby preventing the button assembly from getting stuck when pressed, thereby ensuring that the button assembly can be pressed more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 is an exploded view of the overall structure of an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the inner side of a box body according to an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 A in the enlarged view;

[0024] Figure 5 is a cross-sectional view of a box body and a button assembly according to an embodiment of the present invention;

[0025] Figure 6 yes Figure 5 The enlarged view of point B in the figure;

[0026] Figure 7 is a three-dimensional diagram of a limiting member according to an embodiment of the present invention;

[0027] Figure 8 is a schematic diagram of a mounting member according to an embodiment of the present invention;

[0028] Fig. 9 is a schematic diagram of a button body according to an embodiment of the present invention;

[0029] Fig.10 Schematic diagram of a gasket according to an embodiment of the present invention.

[0030] In the figure, 1, box body; 11, mounting hole; 12, connecting seat; 121, connecting hole; 122, bayonet; 13, accommodating groove; 2, valve body assembly; 21, valve core; 22, mounting piece; 221, positioning step; 222, connecting end; 3, button assembly; 31, button body; 311, limiting groove; 32, connecting part; 321, through hole; 322, gasket; 323, sealing ring; 324, annular groove; 325, stopping protrusion; 33, movable space; 4, limiting piece; 41, limiting protrusion; 42, retaining ring; 43, clamping block; 44, notch; 45, convex strip. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the wording "comprising" used in the present specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0033] like Figures 1 to 10 As shown, the present invention relates to a shower control box, comprising: a box body 1, a valve body assembly 2 and a button assembly 3, the side wall of the box body 1 is provided with a mounting hole 11, the valve body assembly 2 is arranged in the box body 1, the valve body assembly 2 is provided with a valve core 21, the valve core 21 is connected with a mounting member 22, the button assembly 3 is penetrated in the mounting hole 11, and can move relative to the box body 1 along the axial direction of the mounting hole 11, the button assembly 3 is provided with a through hole 321, the end of the mounting member 22 away from the valve core 21 is a connecting end 222, the connecting end 222 passes through the through hole 321 along the axial direction of the mounting hole 11 and is connected to the button assembly 3, so that the button assembly 3 can drive the valve core 21 to move axially along the mounting hole 11, a first gap exists between the mounting member 22 and the through hole 321 in the radial direction, and a second gap exists between the button assembly 3 and the connecting end 222 of the mounting member 22 and / or the valve core 21 in the axial direction of the mounting hole 11.

[0034] In the present invention, the button assembly 3 is penetrated in the mounting hole 11 and can move relative to the box body 1 along the axial direction of the mounting hole 11. The end of the mounting member 22 away from the valve core 21 passes through the through hole 321 along the axial direction of the mounting hole 11 and is connected to the button assembly 3, so that the button assembly 3 can drive the valve core 21 to move axially along the mounting hole 11, so that the button assembly 3 can control the opening and closing of the valve core 21. Then, when the valve body assembly 2 is firmly installed but the installation position is inaccurate or the installation is unstable and shakes, the position of the valve body assembly 2 in the box body 1 is offset in the radial direction of the mounting hole 11, and the valve core 21 is also offset in the radial direction of the mounting hole 11. Therefore, there is a first gap between the mounting member 22 and the through hole 321 in the radial direction, which can allow the mounting member 22 to move radially along the mounting hole 11, so that the mounting member 22 is not easy to abut against the inner wall of the through hole 321, thereby ensuring that the button body 31 is not easy to get stuck. Next, a second gap is present between the button assembly 3 and the end of the mounting piece 22 away from the valve core 21 and / or the valve core 21 in the axial direction of the mounting hole 11, that is, the mounting piece 22 can have a certain displacement relative to the button assembly 3 in the axial direction of the mounting hole 11, so the valve body assembly 2 can have a certain displacement relative to the button assembly 3 in the axial direction of the mounting hole 11, so that when the valve body assembly 2 is firmly installed but the installation position is not accurate and tilted relative to the position in the box body 1, it will not affect the smooth assembly of the button assembly 3 and the mounting piece 22, nor will it cause the button assembly 3 to get stuck, and when the valve body assembly 2 is unstable and axial shaking occurs, it is not easy to cause the button assembly 3 to shake in the axial direction. Therefore, the valve body assembly 2 of the present invention can have a certain displacement relative to the button assembly 3 in the axial and radial directions along the mounting hole 11, so that the valve body assembly 2 can have a certain offset in space relative to the button assembly 3. By utilizing the above-mentioned axial and radial gaps, the position adjustment requirements caused by the displacement of the valve body assembly 2 after installation are met. Therefore, when the position of the valve body assembly 2 installed in the box body 1 is offset, the valve body assembly 2 will not cause the button assembly 3 to shake, nor will part of the button assembly 3 be pressed against the inner wall of the mounting hole 11, thereby preventing the button assembly 3 from getting stuck when pressed, thereby ensuring that the button assembly 3 is smoother when pressed.

[0035] In this embodiment, the button assembly 3 includes a button body 31 and a connecting portion 32 connected together, an active space 33 is formed between the button body 31 and the connecting portion 32, the through hole 321 is located on the connecting portion 32 and is connected to the active space 33, the mounting member 22 is a columnar structure, the connecting end 222 of the mounting member 22 is located in the active space 33, and the outer diameter of the connecting end 222 of the mounting member 22 is larger than the inner diameter of the through hole 321, and the second gap exists between the connecting portion 32 and the connecting end 222 of the mounting member 22 and / or the valve core 21 along the axial direction of the mounting hole 11.

[0036] Since the outer diameter of the connecting end 222 of the mounting member 22 is larger than the inner diameter of the through hole 321, the connecting end 222 of the mounting member 22 can be limited from being separated from the connecting portion 32 through the through hole 321, so that the button assembly 3 can drive the valve core 21 to move axially along the mounting hole 11, and since there is a second gap between the connecting portion 32 and the connecting end 222 of the mounting member 22 and / or the valve core 21 along the axial direction of the mounting hole 11, the mounting member 22 can have a certain axial displacement relative to the button assembly 3, that is, the valve body assembly 2 and the mounting member 22 have a certain offset along the axial direction of the mounting hole 11.

[0037] In other embodiments, the button assembly 3 may also be an integrated structure, the mounting member 22 passes through the button assembly 3 and is connected to the valve core 21, the connecting end 222 of the mounting member 22 is located at the end of the button assembly 3 away from the valve core 21, and there is a second gap with the button assembly 3 in the axial direction of the mounting hole 11, so as to allow the mounting member 22 and the valve body assembly 2 to have an axial offset.

[0038] In this embodiment, the mounting member 22 is a connecting bolt, and a positioning step 221 is provided on the outer periphery of the connecting bolt. The connecting bolt passes through the through hole 321 and is threadedly connected to the valve core 21, and the positioning step 221 is tightly pressed against the valve core 21. The connecting end 222 of the mounting member 22 is the screw head end of the connecting bolt, and the outer diameter of the screw head end of the connecting bolt is larger than the inner diameter of the through hole 321. The outer diameter of the positioning step 221 is smaller than the inner diameter of the through hole 321. A second gap exists between the connecting portion 32 and the screw head end of the connecting bolt and / or the valve core 21.

[0039] That is, when the connecting portion 32 is connected to the valve core 21 through the connecting bolt, the threaded section of the connecting bolt is threadedly connected to the valve core 21, and the positioning step 221 of the connecting bolt is tightly pressed against the end of the valve core 21. At this time, there is a second gap between the connecting portion 32 and the screw head end of the connecting bolt and / or the valve core 21, so that the connecting bolt can have a certain axial displacement relative to the connecting portion 32. At the same time, the outer diameter of the positioning step 221 is smaller than the inner diameter of the through hole 321, so that the connecting bolt can have a certain radial displacement relative to the connecting portion 32. Therefore, the valve body assembly 2 finally has a certain axial and / or radial displacement relative to the button assembly 3. Therefore, when the valve body assembly 2 is offset when installed in the box body 1, it is not easy to cause the button assembly 3 to shake or get stuck when pressed.

[0040] In this embodiment, the connecting portion 32 includes a gasket 322 and a sealing ring 323, the through hole 321 is located on the gasket 322, the sealing ring 323 is sleeved outside the gasket 322, the button body 31 is cylindrical, the gasket 322 is arranged in the button body 31, and the sealing ring 323 is interference fit with the inner wall of the button body 31, and the activity space 33 is formed between the gasket 322 and the side of the button body 31 away from the opening.

[0041] By providing a sealing ring 323 on the outer sleeve of the gasket 322 and then inserting the gasket 322 into the button body 31, the sealing ring 323 is interference fit with the inner wall of the button body 31, so that the button body 31, the gasket 322 and the sealing ring 323 are fixed together, so that the connecting part 32 can be firmly fixed in the button body 31.

[0042] Preferably, an annular groove 324 is formed on the outer periphery of the gasket 322 , and a portion of the sealing ring 323 is embedded in the annular groove 324 , so that the sealing ring 323 can be firmly sleeved on the outer periphery of the gasket 322 .

[0043] Furthermore, a side of the gasket 322 close to the button body 31 is provided with a stopping protrusion 325 abutting against a side of the button body 31 away from the opening, so that when the gasket 322 is inserted into the button body 31 and the stopping protrusion 325 abuts against a side of the button body 31 away from the opening, the activity space 33 can be formed between the button body 31 and the gasket 322.

[0044] Specifically, the stopping protrusion 325 is arranged on a side of the gasket 322 close to the button body 31 and close to the outer edge, and the stopping protrusion 325 extends in the circumferential direction to form an annular structure, and the through hole 321 is located in the middle area of ​​the annular structure, so that the stopping protrusion 325 can stably abut against the side of the button body 31 away from the opening, making the position of the gasket 322 in the button body 31 more stable.

[0045] In this embodiment, the through hole 321 is located in the middle part of the gasket 322, and the size of the middle part of the gasket 322 in the axial direction of the mounting hole 11 is smaller than the size of the positioning step 221 in the axial direction of the mounting hole 11, so that a second gap exists between the gasket 322 and the screw head end of the connecting bolt and / or the valve core 21, so that after the positioning step 221 of the connecting bolt is pressed against the end of the valve core 21, the connecting bolt can have a certain axial displacement relative to the gasket 322.

[0046] In this embodiment, the shower control box also includes a limiting member 4 connected to the box body 1 and located at the mounting hole 11, the limiting member 4 includes a limiting protrusion 41, and a limiting groove 311 is axially provided on the outer side of the button body 31, and the limiting protrusion 41 penetrates into the limiting groove 311.

[0047] A limiting groove 311 is provided on the outer side of the button body 31, and the limiting groove 311 is extended in the axial direction, so that after the limiting protrusion 41 of the limiting member 4 is adapted into the limiting groove 311, the button assembly 3 can be guided to move stably in the axial direction, and the button assembly 3 can be restricted from moving in the circumferential and radial directions. Therefore, when the valve body assembly 2 is tilted and offset relative to the box body 1, it is not easy to cause the button assembly 3 to get stuck or shake, so as not to affect the use.

[0048] Specifically, the limiting groove 311 extends to one end of the button body 31 close to the valve core 21 , so as to facilitate the assembly of the button body 31 and the limiting member 4 .

[0049] Preferably, the limiting member 4 also includes a snap ring 42, which is connected to the inner circumference of the mounting hole 11, and the snap ring 42 extends inward to form the limiting protrusion 41, the button body 31 is inserted into the snap ring 42, and the limiting protrusion 41 is inserted into the limiting groove 311.

[0050] The limiting member 4 also includes a snap ring 42, which is connected to the inner circumference of the mounting hole 11, so as to ensure the stability of the snap ring 42 in the mounting hole 11. The snap ring 42 is formed with the limiting protrusion 41 inwardly, and the limiting protrusion 41 enters the limiting groove 311 of the button body 31 to ensure the stability of the button assembly 3 in the axial movement.

[0051] Furthermore, the retaining ring 42 has two limiting protrusions 41 evenly distributed along the circumferential direction, and the button body 31 has two limiting grooves 311 evenly distributed along the circumferential direction. The two limiting protrusions 41 enter the two limiting grooves 311 accordingly, thereby strengthening the limiting effect on the button assembly 3 and ensuring the stability of the button assembly 3 along the axial movement.

[0052] In this embodiment, a connecting seat 12 is further provided on the inner side of the box body 1 and in an area corresponding to the mounting hole 11. A connecting hole 121 corresponding to the mounting hole 11 is provided on the connecting seat 12. A bayonet 122 connected to the connecting hole 121 is provided on the connecting seat 12. The retaining ring 42 extends outward to form a clamping block 43, and the clamping block 43 enters into the clamping block 122.

[0053] By setting the connecting seat 12, and opening a connecting hole 121 in the area of ​​the connecting seat 12 corresponding to the mounting hole 11, the button assembly 3 is inserted into the mounting hole 11 and the connecting hole 121, which is beneficial to increase the stability of the button assembly 3, and the block 43 of the retaining ring 42 enters the retaining hole 122 of the connecting seat 12, thereby enhancing the stability of the position of the retaining ring 42 to ensure that the retaining ring 42 can limit the button assembly 3 more stably.

[0054] Preferably, the clamping ring 42 has two clamping blocks 43 evenly distributed along the circumference, and the connecting seat 12 has two clamping holes 122 evenly distributed along the circumference. The two clamping blocks 43 correspondingly enter the two clamping holes 122 to further enhance the stability of the position of the clamping ring 42.

[0055] In this embodiment, a receiving groove 13 is circumferentially opened on the inner side of the mounting hole 11, and the retaining ring 42 is embedded in the receiving groove 13, and the inner side of the retaining ring 42 is flush with the inner side of the mounting hole 11, thereby ensuring the stability of the retaining ring 42 installed in the mounting hole 11.

[0056] Preferably, the snap ring 42 is provided with a notch 44, that is, the snap ring 42 is in a ring shape, so that the snap ring 42 has elastic deformation ability, so that the outer diameter of the snap ring 42 can be reduced by squeezing the snap ring 42, and then the snap ring 42 can be easily inserted into the receiving groove 13. After loosening the snap ring 42, the snap ring 42 can elastically recover and press against the bottom wall of the receiving groove 13 to improve the stability of the position of the snap ring 42.

[0057] In this embodiment, a plurality of ridges 45 are evenly distributed along the circumferential direction on the inner side of the retaining ring 42, and the ridges 45 are extended axially, and the side of the ridges 45 away from the retaining ring 42 is an arc-shaped surface, thereby reducing the friction force on the button assembly 3 and making the pressing of the button assembly 3 smoother.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A shower control box, characterized in that: include: A box body (1), wherein the box body (1) is provided with a mounting hole (11); A valve body assembly (2), the valve body assembly (2) being arranged in the box body (1), the valve body assembly (2) being provided with a valve core (21), and a mounting member (22) being connected to the valve core (21); A button assembly (3), the button assembly (3) being inserted into the mounting hole (11) and being movable axially relative to the box body (1) along the mounting hole (11); a through hole (321) being provided on the button assembly (3); an end of the mounting member (22) away from the valve core (21) being a connecting end (222); the connecting end (222) passing through the through hole (321) along the axial direction of the mounting hole (11) and being connected to the button assembly (3), so that the button assembly (3) can drive the valve core (21) to move axially along the mounting hole (11); a first gap being provided between the mounting member (22) and the through hole (321) in the radial direction; and a second gap being provided between the button assembly (3) and the connecting end (222) of the mounting member (22) and / or the valve core (21) in the axial direction of the mounting hole (11); The button assembly (3) comprises a button body (31) and a connecting portion (32) connected together, the through hole (321) being located on the connecting portion (32), the mounting member (22) being a columnar structure, the outer diameter of the connecting end (222) of the mounting member (22) being larger than the inner diameter of the through hole (321), and the second gap existing between the connecting portion (32) and the connecting end (222) of the mounting member (22) and / or the valve core (21) in the axial direction of the mounting hole (11); The mounting member (22) is a connecting bolt, and a positioning step (221) is provided on the outer periphery of the connecting bolt. The connecting bolt passes through the through hole (321) and is threadedly connected to the valve core (21), and the positioning step (221) is tightly pressed against the valve core (21); It also comprises a limiting member (4) connected to the box body (1) and located at the mounting hole (11), the limiting member (4) comprising a limiting protrusion (41), a limiting groove (311) is axially provided on the outer side of the button assembly (3), and the limiting protrusion (41) penetrates into the limiting groove (311); The limiting member (4) further comprises a snap ring (42), the snap ring (42) being connected to the inner periphery of the mounting hole (11), the snap ring (42) extending inward to form the limiting protrusion (41), the button assembly (3) being inserted into the snap ring (42), and the limiting protrusion (41) being inserted into the limiting groove (311); A connecting seat (12) is further provided on the inner side of the box body (1) and in an area corresponding to the mounting hole (11); a connecting hole (121) corresponding to the mounting hole (11) is provided on the connecting seat (12); a bayonet (122) connected to the connecting hole (121) is provided on the connecting seat (12); the clamping ring (42) extends outward to form a clamping block (43); and the clamping block (43) enters the bayonet (122); The clamping ring (42) has two clamping blocks (43) evenly distributed along the circumference, and the connecting seat (12) has two clamping openings (122) evenly distributed along the circumference, and the two clamping blocks (43) are correspondingly inserted into the two clamping openings (122).

2. The shower control box according to claim 1, characterized in that: The connecting portion (32) comprises a gasket (322) and a sealing ring (323); the through hole (321) is located on the gasket (322); the sealing ring (323) is sleeved outside the gasket (322); the button body (31) is cylindrical; the gasket (322) is arranged inside the button body (31); and the sealing ring (323) is interference fit with the inner wall of the button body (31).

3. The shower control box according to claim 2, characterized in that: A stop protrusion (325) is provided on a side of the gasket (322) close to the button body (31) and abuts against a side of the button body (31) away from the opening.

4. The shower control box according to claim 1, characterized in that: The clamping ring (42) has two limiting protrusions (41) evenly distributed along the circumference, and the button assembly (3) has two limiting grooves (311) evenly distributed along the circumference, and the two limiting protrusions (41) enter the two limiting grooves (311) correspondingly.

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