Porthole rotating shaft for yacht

Abstract

The utility model relates to the technical field of yacht portholes, in particular to a porthole rotating shaft for a yacht, which comprises a rotating shaft male head, an anti-rusting mechanism is arranged on the surface of the rotating shaft male head, a stable anti-falling mechanism is arranged on the surfaces of a rotating shaft female head and a fastening screw, and centering assembly mechanisms are arranged on the inner walls of the rotating shaft male head and the rotating shaft female head. When the porthole rotating shaft is used, a user can conveniently center the rotating shaft male head and the rotating shaft female head, so that the porthole rotating shaft is more convenient and faster to assemble, and the rotating shaft male head and the rotating shaft female head can be stably assembled when the porthole rotating shaft is used; the phenomenon that the rotating shaft male head and the rotating shaft female head are loosened in the using process of the porthole rotating shaft is avoided, the rotating shaft male head and the rotating shaft female head are connected and used more stably, the anti-oxidation and anti-rust effects of the surface of the rotating shaft male head are better when the porthole rotating shaft is used, the porthole rotating shaft is more durable in use, and the service life of the porthole rotating shaft is prolonged. And the overall strength is also greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of yacht portholes, and particularly relates to a porthole rotating shaft for a yacht. Background Technique

[0002] A porthole is a circular window with watertightness installed on the side outer plate of a ship, superstructure, and the surrounding wall of the deckhouse, etc. It is generally composed of a main window frame, a glass pressing plate, a storm cover, etc. The ship porthole together with its glass and porthole cover (storm cover) should be a solid structure and should be able to effectively close and ensure watertightness. Now, a porthole rotating shaft for a yacht is needed.

[0003] The existing yacht porthole rotating shafts are usually fixed with bare bolts. It is not easy to align during installation and the exposed nuts affect the appearance. In addition, the existing porthole rotating shafts have some disadvantages to a certain extent. When the porthole rotating shaft is used, it needs to be assembled first. The existing porthole rotating shafts are inconvenient to align and assemble during use, and it is not convenient enough during assembly. This makes it inconvenient for the user to align the male rotating shaft head and the female rotating shaft head of the rotating shaft during use, making the assembly of the porthole rotating shaft not convenient and fast enough, and the assembly is not accurate enough; the porthole rotating shaft is prone to loosening and becoming unstable during use. The existing porthole rotating shafts have poor stability and anti-loosening performance during use. This makes it impossible to firmly assemble the male rotating shaft head and the female rotating shaft head of the rotating shaft during the use of the porthole rotating shaft, and it is easy to cause loosening between the male rotating shaft head and the female rotating shaft head during the use of the porthole rotating shaft, making the connection between the male rotating shaft head and the female rotating shaft head not stable enough during use; the surface of the porthole rotating shaft is prone to being eroded by seawater and rainwater and rusting due to oxidation during use. The existing porthole rotating shafts have poor anti-oxidation and anti-rusting effects during use. This reduces the anti-oxidation and anti-rusting effects on the surface of the male rotating shaft head of the porthole rotating shaft during use, making the porthole rotating shaft not durable enough during use, and the overall strength is also greatly reduced. Content of the Utility Model

[0004] The purpose of the utility model is to provide a porthole rotating shaft for a yacht, so as to solve the problems of inconvenient alignment and assembly during the use of the porthole rotating shaft, not being convenient enough during assembly, poor stability and anti-loosening performance, and poor anti-oxidation and anti-rusting effects mentioned in the above background technique.

[0005] To achieve the above object, the present utility model provides the following technical solution: A porthole rotating shaft for a yacht, comprising a male rotating shaft head. One side of the male rotating shaft head is provided with a female rotating shaft head. The surface of the female rotating shaft head is threadedly connected with a fastening screw. One end of the fastening screw penetrates through the female rotating shaft head and is threadedly fastened to the surface of the male rotating shaft head. An installation groove is opened inside the female rotating shaft head. One end of the male rotating shaft head extends into the installation groove. An anti-rust mechanism is arranged on the surface of the male rotating shaft head. The anti-rust mechanism internally includes an anti-rust layer, an anti-rust coating and an anti-rust group. A stable anti-loosening and anti-detaching mechanism is arranged on the surfaces of the female rotating shaft head and the fastening screw. The stable anti-loosening and anti-detaching mechanism internally includes an anti-detaching ring, a fixing cylinder and a stable anti-loosening and anti-detaching group. An alignment and assembly mechanism is arranged on the inner walls of the male rotating shaft head and the female rotating shaft head. The alignment and assembly mechanism internally includes an assembly groove, an assembly block, a fixing clip and a fixing card slot.

[0006] Preferably, the anti-rust group is arranged on the surface of the male rotating shaft head. The anti-rust group is composed of a first antioxidant layer and a second antioxidant layer. A second antioxidant layer for antioxidant of the surface of the male rotating shaft head is adhered to the surface of the male rotating shaft head. The first antioxidant layer covers the surface of the second antioxidant layer. The surface of the first antioxidant layer is adhered to the surface on the side of the second antioxidant layer away from the male rotating shaft head.

[0007] Preferably, an anti-rust layer for preventing rust on the surface of the male rotating shaft head is adhered to the surface of the first antioxidant layer. The surface of the anti-rust layer is adhered to the surface on the side of the first antioxidant layer away from the second antioxidant layer. The material of the anti-rust layer is epoxy resin material.

[0008] Preferably, an anti-rust coating covers the surface of the anti-rust layer. The material of the anti-rust coating is a polyolefin coating. The surface of the anti-rust coating is adhered to the surface on the side of the anti-rust layer away from the first antioxidant layer.

[0009] Preferably, the stable anti-loosening and anti-detaching group is arranged on the surfaces of the female rotating shaft head and the fastening screw. The stable anti-loosening and anti-detaching group is composed of a groove body, a stretching spring and an anti-detaching clip. An anti-detaching ring is installed on the surface of the female rotating shaft head. The anti-detaching ring is in threaded fit with the inner wall of the fastening screw. A fixing cylinder is installed on the surface at the top position of the anti-detaching ring. Groove bodies are opened in the inner walls of the fixing cylinders.

[0010] Preferably, an anti-detaching clip is arranged inside the groove body. The anti-detaching clip is in sliding fit with the inner wall of the groove body. The anti-detaching clip is in clamping fit with the surface of the fastening screw. Stretching springs are installed on the surfaces of the anti-detaching clips. One end of each stretching spring is fixed to the inner wall of the groove body.

[0011] Preferably, assembly blocks are installed on the surfaces of the male shaft ends, and assembly grooves are formed in the inner walls of the female shaft ends. The surfaces of the assembly grooves and the assembly blocks are slidably engaged with each other.

[0012] Preferably, fixing clips are installed on the surfaces of the assembly blocks, and fixing card slots are formed in the inner walls of the female shaft ends. The surfaces of the fixing card slots and the fixing clips are snap-fitted with each other.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The porthole shaft for the yacht not only facilitates the user to center the male shaft end and the female shaft end during the use of the porthole shaft, making the assembly of the porthole shaft more convenient, faster, and more accurate, but also enables the male shaft end and the female shaft end to be firmly assembled together during the use of the porthole shaft, avoiding the phenomenon of loosening between the male shaft end and the female shaft end during the use of the porthole shaft, making the connection between the male shaft end and the female shaft end more stable during use. Moreover, the anti-oxidation and anti-rust effect on the surface of the male shaft end is better during the use of the porthole shaft, making the porthole shaft more durable during use, and greatly improving the overall strength.

[0014] 1. By providing a centering and assembly mechanism, the male shaft end drives the assembly block to slide inside the assembly groove. Under the combined action of the assembly groove and the assembly block, the male shaft end and the female shaft end are positioned. At this time, the assembly block drives the fixing clip to be inserted into the fixing card slot. Under the clamping action of the fixing clip and the fixing card slot, the male shaft end and the female shaft end are prevented from loosening, avoiding the phenomenon that it is not convenient enough to center the male shaft end and the female shaft end during assembly, realizing the function of centering and assembling the porthole shaft, so that it is convenient for the user to center the male shaft end and the female shaft end during the use of the porthole shaft, making the assembly of the porthole shaft more convenient, faster, and more accurate.

[0015] 2. By providing a stable anti-loosening mechanism, the user tightens the fastening screw on the surface of the female shaft end to fix the male shaft end and the female shaft end. When the fastening screw is used for a long time, it is likely to loosen. At this time, the anti-loosening ring prevents the fastening screw from loosening. When the fastening screw stops rotating, at this time, under the elastic force of the extension spring in the groove body, the anti-loosening card member is driven to move, so that the anti-loosening card member is inserted onto the surface of the corresponding fastening screw. Under the combined action of the anti-loosening card member and the extension spring, the fastening screw is prevented from loosening, so that the fastening screw will not loosen even after long-term use, realizing the function of stable anti-loosening of the porthole shaft, so that the male shaft end and the female shaft end can be firmly assembled together during the use of the porthole shaft, avoiding the phenomenon of loosening between the male shaft end and the female shaft end during the use of the porthole shaft, making the connection between the male shaft end and the female shaft end more stable during use.

[0016] 3. By setting up an anti-rust mechanism, the antioxidant effect on the surface of the male rotating shaft is improved under the combined action of the first antioxidant layer and the second antioxidant layer. The anti-rust effect on the surface of the male rotating shaft is better under the combined action of the anti-rust layer and the anti-rust coating. When the surface of the male rotating shaft is eroded by seawater and rainwater, it is not easy to rust, making the service life of the male rotating shaft longer, realizing the anti-rust function of the porthole rotating shaft. Thus, the antioxidant and anti-rust effect on the surface of the male rotating shaft is better when the porthole rotating shaft is in use, making the porthole rotating shaft more durable during use and greatly improving the overall strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of the present utility model;

[0018] Figure 2 is a front view sectional structure schematic diagram of the present utility model;

[0019] Figure 3 is a side view sectional enlarged structure schematic diagram of the present utility model;

[0020] Figure 4 is of the present utility model Figure 2 enlarged structure schematic diagram of the anti-rust mechanism therein;

[0021] Figure 5 is of the present utility model Figure 2 enlarged structure schematic diagram of the stable anti-disengagement mechanism therein;

[0022] Figure 6 is an enlarged structure schematic diagram of the centering assembly mechanism of the present utility model.

[0023] In the figure: 1. Male rotating shaft; 101. Female rotating shaft; 102. Installation groove; 103. Fastening screw; 2. Anti-rust mechanism; 21. Anti-rust layer; 22. Anti-rust coating; 23. Anti-rust group; 231. First antioxidant layer; 232. Second antioxidant layer; 3. Stable anti-disengagement mechanism; 31. Anti-disengagement ring; 32. Fixed cylinder; 33. Stable anti-disengagement group; 331. Groove body; 332. Extension spring; 333. Anti-disengagement card; 4. Centering assembly mechanism; 41. Assembly groove; 42. Assembly block; 43. Fixed card; 44. Fixed card slot. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] The structure of a porthole rotating shaft for a yacht provided by the present invention is as Figure 1 and Figure 2 shown, including a male rotating shaft 1. One side of the male rotating shaft 1 is provided with a female rotating shaft 101. A fastening screw 103 is threadedly connected to the surface of the female rotating shaft 101. One end of the fastening screw 103 penetrates through the female rotating shaft 101 and is threadedly fastened to the surface of the male rotating shaft 1. An installation groove 102 is opened inside the female rotating shaft 101, and one end of the male rotating shaft 1 extends into the installation groove 102.

[0026] Furthermore, as Figure 2 and Figure 4 shown, an anti-rust mechanism 2 is provided on the surface of the male rotating shaft 1. The inside of the anti-rust mechanism 2 includes an anti-rust layer 21, an anti-rust coating 22, and an anti-rust group 23. The anti-rust group 23 is provided on the surface of the male rotating shaft 1. The anti-rust group 23 is composed of a first antioxidant layer 231 and a second antioxidant layer 232. The second antioxidant layer 232 for antioxidant of the surface of the male rotating shaft 1 is adhered to the surface of the male rotating shaft 1. The first antioxidant layer 231 covers the surface of the second antioxidant layer 232. The surface of the first antioxidant layer 231 is adhered to the surface of the second antioxidant layer 232 on the side away from the male rotating shaft 1. The anti-rust layer 21 for anti-rust of the surface of the male rotating shaft 1 is adhered to the surface of the first antioxidant layer 231. The surface of the anti-rust layer 21 is adhered to the surface of the first antioxidant layer 231 on the side away from the second antioxidant layer 232. The material of the anti-rust layer 21 is epoxy resin material. The anti-rust coating 22 covers the surface of the anti-rust layer 21. The material of the anti-rust coating 22 is a polyolefin coating. The surface of the anti-rust coating 22 is adhered to the surface of the anti-rust layer 21 on the side away from the first antioxidant layer 231.

[0027] During implementation, under the combined action of the first antioxidant layer 231 and the second antioxidant layer 232, the antioxidant effect on the surface of the male shaft 1 is improved. Under the combined action of the rust prevention layer 21 and the rust prevention coating 22, the rust prevention effect on the surface of the male shaft 1 is better. When the surface of the male shaft 1 is eroded by seawater and rainwater, it is not easy to rust, so that the service life of the male shaft 1 is longer, thus realizing the function of rust prevention for the porthole shaft.

[0028] Furthermore, as Figure 2 and Figure 5 shown, a stable anti - detachment mechanism 3 is provided on the surfaces of the female shaft 101 and the fastening screw 103. The inside of the stable anti - detachment mechanism 3 includes an anti - detachment ring 31, a fixed cylinder 32 and a stable anti - detachment group 33. The stable anti - detachment group 33 is arranged on the surfaces of the female shaft 101 and the fastening screw 103. The stable anti - detachment group 33 is composed of a groove body 331, a stretching spring 332 and an anti - detachment card 333. An anti - detachment ring 31 is installed on the surface of the female shaft 101. The anti - detachment ring 31 is in threaded fit with the inner wall of the fastening screw 103. A fixed cylinder 32 is installed on the surface at the top position of the anti - detachment ring 31. Groove bodies 331 are provided on the inner walls of the fixed cylinder 32. An anti - detachment card 333 is arranged inside the groove body 331. The anti - detachment card 333 is in sliding fit with the inner wall of the groove body 331. The anti - detachment card 333 is in clamping fit with the surface of the fastening screw 103. Stretching springs 332 are installed on the surfaces of the anti - detachment cards 333. One end of the stretching spring 332 is fixed to the inner wall of the groove body 331.

[0029] During implementation, the user tightens the fastening screw 103 on the surface of the female shaft 101 to fix the male shaft 1 and the female shaft 101. When the fastening screw 103 is used for a long time, it is easy to become loose. At this time, the anti - detachment ring 31 prevents the fastening screw 103 from loosening. When the fastening screw 103 stops rotating, at this time, under the elastic force of the stretching spring 332 inside the groove body 331, the anti - detachment card 333 is driven to move, so that the anti - detachment card 333 is clamped to the surface of the corresponding fastening screw 103. Under the combined action of the anti - detachment card 333 and the stretching spring 332, the fastening screw 103 is prevented from loosening, so that the fastening screw 103 will not become loose even after long - term use, thus realizing the function of stable anti - detachment for the porthole shaft.

[0030] Furthermore, as Figure 2 and Figure 6As shown, a centering assembly mechanism 4 is provided on the inner walls of the male shaft joint 1 and the female shaft joint 101. The inside of the centering assembly mechanism 4 includes an assembly groove 41, an assembly block 42, a fixed fastener 43, and a fixed card slot 44. Assembly blocks 42 are installed on the surfaces of the male shaft joint 1, and assembly grooves 41 are formed in the inner walls of the female shaft joint 101. The surfaces of the assembly groove 41 and the assembly block 42 are slidably matched with each other. A fixed fastener 43 is installed on the surface of the assembly block 42, and fixed card slots 44 are formed in the inner walls of the female shaft joint 101. The surfaces of the fixed card slot 44 and the fixed fastener 43 are snap-fitted with each other.

[0031] During implementation, the male shaft joint 1 drives the assembly block 42 to slide inside the assembly groove 41. Under the combined action of the assembly groove 41 and the assembly block 42, the male shaft joint 1 and the female shaft joint 101 are positioned. At this time, the assembly block 42 drives the fixed fastener 43 to snap into the inside of the fixed card slot 44. Under the clamping action of the fixed fastener 43 and the fixed card slot 44, the male shaft joint 1 and the female shaft joint 101 are prevented from loosening, avoiding the phenomenon that it is not convenient enough to center when the male shaft joint 1 and the female shaft joint 101 are assembled, so as to realize the function of centering and assembling the porthole shaft.

[0032] Working principle: When in use, first place the female shaft joint 101 on one side of the male shaft joint 1, so that the male shaft joint 1 drives the assembly block 42 to slide inside the assembly groove 41. Under the combined action of the assembly groove 41 and the assembly block 42, the male shaft joint 1 and the female shaft joint 101 are positioned. At this time, the assembly block 42 drives the fixed fastener 43 to snap into the inside of the fixed card slot 44. Under the clamping action of the fixed fastener 43 and the fixed card slot 44, the male shaft joint 1 and the female shaft joint 101 are prevented from loosening, avoiding the phenomenon that it is not convenient enough to center when the male shaft joint 1 and the female shaft joint 101 are assembled, so as to realize the function of centering and assembling the porthole shaft. This makes it convenient for the user to center the male shaft joint 1 and the female shaft joint 101 when using the porthole shaft, making the assembly of the porthole shaft more convenient and fast, and the assembly more accurate.

[0033] Subsequently, the user tightens the fastening screw 103 on the surface of the rotating shaft female head 101 to fix the rotating shaft male head 1 and the rotating shaft female head 101. When the fastening screw 103 is used for a long time, it is prone to loosening. At this time, under the action of the anti-loosening ring 31, the fastening screw 103 is prevented from loosening. When the fastening screw 103 stops rotating, at this time, under the elastic force of the extension spring 332 inside the groove body 331, the anti-loosening card member 333 is driven to move, so that the anti-loosening card member 333 is clamped to the surface of the corresponding fastening screw 103. Under the combined action of the anti-loosening card member 333 and the extension spring 332, the fastening screw 103 is prevented from loosening, so that the fastening screw 103 will not loosen even after long-term use, so as to realize the function of the porthole rotating shaft to be firmly anti-loosening, so that when the porthole rotating shaft is used, the rotating shaft male head 1 and the rotating shaft female head 101 can be firmly assembled, avoiding the loosening phenomenon between the rotating shaft male head 1 and the rotating shaft female head 101 during the use of the porthole rotating shaft, and making the rotating shaft male head 1 and the rotating shaft female head 101 more stable when connected and used.

[0034] Subsequently, under the combined action of the first antioxidant layer 231 and the second antioxidant layer 232, the antioxidant effect on the surface of the rotating shaft male head 1 is improved. Under the combined action of the anti-rust layer 21 and the anti-rust coating 22, the anti-rust effect on the surface of the rotating shaft male head 1 is better. When the surface of the rotating shaft male head 1 is eroded by seawater and rainwater, it is not easy to rust, making the service life of the rotating shaft male head 1 longer, so as to realize the function of the porthole rotating shaft to prevent rust, so that when the porthole rotating shaft is used, the antioxidant and anti-rust effect on the surface of the rotating shaft male head 1 is better, making the porthole rotating shaft more durable when used, and the overall strength is also greatly improved, and finally the use of the porthole rotating shaft is completed.

[0035] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A porthole rotating shaft for a yacht, comprising a male rotating shaft (1), characterized in that: On one side of the male shaft joint (1), there is a female shaft joint (101). The surface of the female shaft joint (101) is threadedly connected with a fastening screw (103). One end of the fastening screw (103) penetrates through the female shaft joint (101) and is threadedly fastened to the surface of the male shaft joint (1). An installation groove (102) is opened inside the female shaft joint (101). One end of the male shaft joint (1) extends into the interior of the installation groove (102). An anti-rust mechanism (2) is arranged on the surface of the male shaft joint (1). The interior of the anti-rust mechanism (2) includes an anti-rust layer (21), an anti-rust coating (22) and an anti-rust group (23). A stable anti-loosening mechanism (3) is arranged on the surfaces of the female shaft joint (101) and the fastening screw (103). The interior of the stable anti-loosening mechanism (3) includes an anti-loosening ring (31), a fixed cylinder (32) and a stable anti-loosening group (33). A centering assembly mechanism (4) is arranged on the inner walls of the male shaft joint (1) and the female shaft joint (101). The interior of the centering assembly mechanism (4) includes an assembly groove (41), an assembly block (42), a fixed clamping part (43) and a fixed clamping groove (44).

2. The hinge shaft for yacht porthole according to claim 1, characterized in that: The anti-rust group (23) is arranged on the surface of the male shaft joint (1). The anti-rust group (23) is composed of a first antioxidant layer (231) and a second antioxidant layer (232). The second antioxidant layer (232) for antioxidation of the surface of the male shaft joint (1) is adhered to the surface of the male shaft joint (1). The first antioxidant layer (231) covers the surface of the second antioxidant layer (232). The surface of the first antioxidant layer (231) is adhered to the surface of the second antioxidant layer (232) on the side away from the male shaft joint (1).

3. The yacht side window rotating shaft according to claim 2, characterized in that: The anti-rust layer (21) for preventing rust on the surface of the male shaft joint (1) is adhered to the surface of the first antioxidant layer (231). The surface of the anti-rust layer (21) is adhered to the surface of the first antioxidant layer (231) on the side away from the second antioxidant layer (232). The material of the anti-rust layer (21) is epoxy resin material.

4. The hinge shaft for yacht porthole according to claim 3, characterized in that: The anti-rust coating (22) covers the surface of the anti-rust layer (21). The material of the anti-rust coating (22) is a polyolefin coating. The surface of the anti-rust coating (22) is adhered to the surface of the anti-rust layer (21) on the side away from the first antioxidant layer (231).

5. A porthole rotating shaft for a yacht according to claim 1, characterized in that: The stable anti-loosening group (33) is arranged on the surfaces of the female shaft joint (101) and the fastening screw (103). The stable anti-loosening group (33) is composed of a groove body (331), a stretching spring (332) and an anti-loosening clamping part (333). An anti-loosening ring (31) is installed on the surface of the female shaft joint (101). The anti-loosening ring (31) is in threaded cooperation with the inner wall of the fastening screw (103). A fixed cylinder (32) is installed on the surface at the top position of the anti-loosening ring (31). Groove bodies (331) are opened in the inner walls of the fixed cylinders (32).

6. The marine window rotating shaft according to claim 5, characterized in that: An anti - detachment clip (333) is arranged inside the groove body (331). The anti - detachment clip (333) is slidably engaged with the inner wall of the groove body (331), and the anti - detachment clip (333) is snap - engaged with the surface of the fastening screw (103). Stretch springs (332) are installed on the surface of the anti - detachment clip (333), and one end of each stretch spring (332) is fixed to the inner wall of the groove body (331).

7. The hinge shaft for yacht porthole according to claim 1, wherein: Assembly blocks (42) are installed on the surface of the male shaft head (1). Assembly grooves (41) are formed in the inner walls of the female shaft head (101), and the assembly grooves (41) are slidably engaged with the surfaces of the assembly blocks (42).

8. A porthole rotating shaft for a yacht according to claim 7, characterized in that: Fixed clips (43) are installed on the surfaces of the assembly blocks (42). Fixed card slots (44) are formed in the inner walls of the female shaft head (101), and the fixed card slots (44) are snap - engaged with the surfaces of the fixed clips (43).

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