Connecting structure and connector assembly with same

Abstract

The utility model discloses a connecting structure and a joint assembly with the same, the connecting structure comprises a first connecting piece, a second connecting piece and a middle piece, the first connecting piece is internally provided with a first channel, the second connecting piece is internally provided with a second channel, one end of the middle piece is connected with the first connecting piece, and the other end of the middle piece is connected with the second connecting piece; a middle channel communicated with the first channel and the second channel is arranged in the middle piece, the middle piece comprises a first limiting part protruding out of the peripheral side of the first connecting piece, and the side face, close to the first connecting piece, of the first limiting part is arranged to be a first inclined face; the outer diameter of the first inclined face is gradually increased from the end, close to the first connecting piece, of the first inclined face to the end, close to the second connecting piece, of the first inclined face, so that when the first connecting piece and the sleeve piece are connected in a matched mode, tight connection is achieved through interference fit between the first inclined face and a third inclined face correspondingly arranged on the sleeve piece. According to the connecting structure, the tightness and the stability of connection between the first connecting piece and the external sleeve piece can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of pipe joints, in particular to a connection structure and a joint assembly provided with the structure. Background Art

[0002] The joint assembly is a commonly used connector in pipe structures such as water pipes and air pipes. The existing joint assembly, such as the utility model patent named a freely retractable water pipe (publication number: CN207830786U), the water pipe connecting part in this technical solution includes an intermediate piece and threaded connectors respectively connected to both sides of the intermediate piece, one of the threaded connectors is provided with an assembly with a water pipe interface, the end of the water pipe passes through a sheath and is fastened to the assembly so that the water pipe is connected to the water pipe interface, the sheath is used to protect the connection position from damage, the sheath is threadedly connected to the threaded connector, after the connection, the end face of the sheath and the side face of the intermediate piece are abutted and limited, but the end face of the sheath and the side face of the intermediate piece in this technical solution are respectively planes arranged radially along the water pipe connecting part, and the connection method of the planes abutting against each other has poor tightness and stability of the connection. Summary of the invention

[0003] The utility model aims at the deficiencies in the prior art and provides a connection structure including a first connection member, a second connection member and an intermediate member, the first connection member being used for being connected in cooperation in an external kit, the first connection member being provided with a first channel for docking with an external assembly member; the second connection member being used for being connected in cooperation with an external mounting member, the second connection member being provided with a second channel; the intermediate member being connected to the first connection member at one end and to the second connection member at the other end, and being provided with an intermediate channel connecting the first channel and the second channel, the intermediate member comprising a first limiting portion protruding from the outer peripheral side of the first connection member, a side surface of the first limiting portion close to the first connection member being provided with a first inclined surface, and an outer diameter of the first inclined surface gradually increasing from an end close to the first connection member toward an end close to the second connection member, so that when the first connection member is connected in cooperation with the kit, a tight connection is achieved through interference fit between the first inclined surface and a third inclined surface correspondingly arranged on the kit.

[0004] Preferably, the included angle between the first inclined surface and the outer wall of the first connecting member is 135° to 165°.

[0005] Preferably, the included angle between the first inclined surface and the outer wall of the first connecting member is 143° to 153°.

[0006] Preferably, the included angle between the first inclined surface and the outer wall of the first connecting member is 148°.

[0007] Preferably, the outer side surface of the first connecting member is provided with a first threaded portion for being arranged corresponding to the third threaded portion on the inner side surface of the sleeve, and the first connecting member is detachably connected by threading the first threaded portion and the third threaded portion together.

[0008] Preferably, the outer diameter of the second connecting member is smaller than the outer diameter of the first limiting portion, a side surface of the first limiting portion close to the second connecting member is arranged as a second inclined surface, and the outer diameter of the second inclined surface gradually increases from its end close to the second connecting member toward its end close to the first connecting member, so that when the second connecting member is matched and connected with the mounting member, the second inclined surface and the fourth inclined surface correspondingly arranged on the mounting member are tightly connected through interference fit; the intermediate member has a first outer side surface coaxially arranged with the intermediate channel, one end of the first outer side surface is connected to an end of the first inclined surface away from the first connecting member, and the other end is connected to an end of the second inclined surface away from the second connecting member.

[0009] Preferably, the middle piece also includes a second limiting portion, which protrudes from the inner circumference of the first connecting piece to form a first limiting surface on a side of the second limiting portion close to the first connecting piece that can be abutted against the assembly part or the sealing part, and the intermediate channel is arranged through the second limiting portion, and the first limiting surface is arranged around the intermediate channel.

[0010] Preferably, the middle channel is configured as a polygonal structure.

[0011] Preferably, the middle channel is configured as a hexagonal structure.

[0012] The utility model also provides a joint assembly, including the above-mentioned connection structure and a kit for being connected with the first connecting piece, the kit including a sleeve body, a connecting sleeve connected to one end of the sleeve body, and a limiting sleeve connected to the connecting sleeve away from one end of the sleeve body, the inner side wall of the connecting sleeve is provided with a third threaded portion for being threadedly connected with the first connecting piece, the inner side wall of the limiting sleeve is provided with a third inclined surface from its free end toward the connecting sleeve, and the outer diameter of the third inclined surface gradually decreases from its free end toward the direction close to the connecting sleeve, and when the first connecting piece is connected with the kit, a tight connection is achieved through the interference fit between the first inclined surface and the third inclined surface.

[0013] The connection structure provided by the utility model is tightly connected by interference fit between the first inclined surface and the third inclined surface correspondingly arranged on the external kit. That is, the connection method of plane-to-plane abutment in the prior art is replaced by the connection method of interference fit between inclined surfaces. The inclined surface design structure is more stable and strong, and can cooperate with the kit at a deeper level, thereby greatly improving the tightness and stability of the connection between the first connecting piece and the external kit.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 The structure diagram of the connection structure of one embodiment of the utility model is as follows Figure 1 .

[0017] Figure 2 The structure diagram of the connection structure of one embodiment of the utility model is as follows Figure 2 .

[0018] Figure 3 The structure diagram of the connection structure of one embodiment of the utility model is as follows Figure 3 .

[0019] Figure 4 It is a schematic cross-sectional structural diagram of a connection structure of an embodiment of the utility model.

[0020] Figure 5 It is a structural schematic diagram of a joint assembly according to an embodiment of the utility model.

[0021] Figure 6 The figure is a schematic diagram of the exploded structure of a joint assembly according to an embodiment of the present invention.

[0022] Figure 7 The cross-sectional structure diagram of the connector assembly of one embodiment of the utility model is shown in FIG. Figure 1 .

[0023] Figure 8 The cross-sectional structure diagram of the connector assembly of one embodiment of the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the patent application specification and claims of the utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0029] like Figure 1-4As shown, as an embodiment of the utility model, a connection structure 100 is provided, including a first connection member 1, a second connection member 2, and an intermediate member 3. The first connection member 1 is used to be connected in an external set such as a sheath or a nut lock sleeve, and a first channel 11 for connecting to an external assembly such as a pipe fitting or an adapter inner core is provided inside the first connection member 1. The second connection member 2 is used to be connected with an external mounting member such as a pipe fitting or an adapter or a nut lock sleeve, and a second channel 21 is provided inside the second connection member 2. One end of the intermediate member 3 is connected to the first connection member 1, and the other end is connected to the second connection member 2, and an intermediate channel 321 connecting the first channel 11 and the second channel 21 is provided inside, and the intermediate channel 321, the first channel 11 and the second channel 21 are connected to each other, and are used to supply water, gas and other media to pass through. The middle piece 3 includes a first limiting portion 31 arranged on the outer peripheral side of the protruding first connecting piece 1, and a side surface of the first limiting portion 31 close to the first connecting piece 1 is set as a first inclined surface 311, and the outer diameter of the first inclined surface 311 gradually increases from its end close to the first connecting piece 1 toward the end close to the second connecting piece 2, so that when the first connecting piece 1 is connected with the kit, the first inclined surface 311 is tightly connected with the third inclined surface correspondingly arranged on the kit through interference fit. That is, the connection method of the interference fit between the inclined surfaces replaces the connection method of the planes abutting against each other in the prior art, and the inclined surface design structure is more stable and strong, and can cooperate with the kit more deeply, thereby greatly improving the tightness and stability of the connection between the first connecting piece 1 and the external kit.

[0030] like Figure 4 As shown, in some specific embodiments, the angle between the first inclined surface 311 and the outer wall of the first connecting member 1 is 135° to 165°, which can ensure that the set is easily matched with the first inclined surface 311 in depth, and provide a relatively strong counter-support force to the set, thereby preventing the set from being damaged due to excessive matching with the first connecting member 1. Optionally, the angle between the first inclined surface 311 and the outer wall of the first connecting member 1 is 143° to 153°, preferably 148°, which has better tight matching effect and counter-support effect.

[0031] In some specific embodiments, the outer side surface of the first connecting member 1 is provided with a first threaded portion 12 which is arranged corresponding to the third threaded portion on the inner side surface of the kit. The first connecting member 1 is detachably connected by threading the first threaded portion 12 and the third threaded portion with each other. The threaded connection facilitates adjustment of the tight fit between the kit and the connecting structure 100. In other embodiments, other structures such as snap connections may also be used for detachable connection.

[0032] In some specific embodiments, the outer diameter of the second connecting member 2 is smaller than the outer diameter of the first limiting portion 31, and a side surface of the first limiting portion 31 close to the second connecting member 2 is set as a second inclined surface 312, and the outer diameter of the second inclined surface 312 gradually increases from the end close to the second connecting member 2 toward the end close to the first connecting member 1, so that when the second connecting member 2 is matched and connected with the mounting member, the second inclined surface 312 is tightly connected with the corresponding fourth inclined surface arranged on the mounting member through interference fit, and can be more deeply matched with the mounting member, thereby greatly improving the tightness of the connection between the second connecting member 2 and the mounting member.

[0033] like Figure 4 As shown, in some specific embodiments, the angle between the second inclined surface 312 and the outer wall of the second connecting member 2 is 105° to 125°, which can ensure that the mounting member is relatively easy to deeply fit with the second inclined surface 312, while providing a relatively strong counter-support force to the mounting member, preventing the mounting member from being damaged due to excessive fit with the second connecting member 2, and forming a triangular support structure in combination with the first inclined surface 311, thereby enhancing the stability of the structure of the first limit portion 31 itself, and the structural strength and bearing capacity are better, and more stable and strong. Optionally, the angle between the second inclined surface 312 and the outer wall of the second connecting member 2 is 109° to 119°, preferably 114°, with better tight fit effect, counter-support effect and structural stability.

[0034] In some specific embodiments, the angle between the first inclined surface 311 and the second inclined surface 312 is 85° to 110°, so that the tight fit and anti-support effect between the first inclined surface 311 and the first connecting member 1, the tight fit and anti-support effect between the second inclined surface 312 and the second connecting member 2, and the stability of the structure of the first limiter 31 itself are better. Optionally, the angle between the first inclined surface 311 and the second inclined surface 312 is 88° to 108°, especially 90° to 105°, preferably 98°, which has the best overall effect.

[0035] like Figure 4 As shown, in some specific embodiments, the middle piece 3 has a first outer side surface 313 coaxially arranged with the middle channel 321, one end of the first outer side surface 313 is connected to one end of the first inclined surface 311 away from the first connecting piece 1, and the other end is connected to one end of the second inclined surface 312 away from the second connecting piece 2. Compared with directly connecting one end of the first inclined surface 311 away from the first connecting piece 1 with one end of the second inclined surface 312 away from the second connecting piece 2, and forming a sharp blade shape on the outer side of the middle piece 3, in this embodiment, the first inclined surface 311 and the second inclined surface 312 are indirectly connected through the first outer side surface 313, which is not easy to scratch the operator or scratch the pipe, and is safer to use.

[0036] like Figure 3As shown, in some specific embodiments, the middle piece 3 also includes a second limiting portion 32, and the second limiting portion 32 is arranged on the inner peripheral side of the protruding first connecting piece 1 to form a first limiting surface 322 that can be abutted against the assembly or the sealing member on a side surface of the second limiting portion 32 close to the first connecting piece 1. The sealing member can be a sealing ring such as silicone or rubber. The use of the sealing member has a better sealing effect and can prevent leakage of media such as water and gas. In this embodiment, the assembly is a transition inner core, and the external hose is sleeved outside the transition inner core. The hose is docked outside the transition inner core through a tightening sleeve sleeved between the hose and the kit, and the sealing member is interference-connected between the transition inner core and the first limiting surface 322. In other embodiments, the hose can also be directly docked outside the transition inner core between the tightening sleeves sleeved outside the hose; or the hose can be directly docked in the first channel 11 as an assembly, and the sealing member can be interference-connected between the assembly and the first limiting surface 322; or no sealing member is provided, and the assembly is limited by abutting against the first limiting surface 322.

[0037] In some specific embodiments, the middle channel 321 is arranged through the second limiting portion 32, and the first limiting surface 322 is arranged around the middle channel 321. As an embodiment of the utility model, the assembly is axially limited by abutting the first limiting surface 322 with one end face away from the first connecting member 1, and the middle channel 321 is set as a polygonal structure, which is stable and strong, and can provide a strong counter-support effect for the assembly, and improve the stability and stability of the connection between the connection structure 100 and the assembly. The middle channel 321 is set as a hexagonal structure, which is simple and stable. In other embodiments, the middle channel 321 can also be set as a polygonal structure such as a square, triangle, pentagon, octagon, etc., which can improve the stability and stability of the connection between the connection structure 100 and the assembly.

[0038] As another embodiment of the present invention, a convex ring is convexly provided on the assembly along its circumferential direction, and the assembly extends into the middle channel 321 through one end, and the side surface of the convex ring away from the first connecting member 1 abuts against the first limiting surface 322 for axial limiting, and the middle channel 321 is set to a polygonal structure, which is stable and strong and can provide a strong counter-support effect for the assembly. At the same time, the assembly is set to a polygonal structure arranged corresponding to the middle channel 321. Through the cooperation between the assembly and the middle channel 321, the assembly can be circumferentially limited to prevent the assembly from rotating relative to the connecting structure 100, thereby improving the stability and stability of the connection between the connecting structure 100 and the assembly. The middle channel 321 is set to a hexagonal structure, which is simple and stable. In other embodiments, the middle channel 321 can also be set to a square, triangle, pentagon, octagon or other polygonal structure, which can improve the stability and stability of the connection between the connecting structure 100 and the assembly.

[0039] like Figure 4 As shown, in some specific embodiments, the inner diameter of the second channel 21 is larger than the inner diameter of the middle channel 321, so that a second limiting surface 323 that can abut against the mounting member or the sealing body is formed on a side surface of the second limiting portion close to the second connecting member 2, and the second limiting surface 323 is arranged around the middle channel 321. The inner diameter of the second channel 21 is smaller than the inner diameter of the first channel 11, and the outer diameter of the first limiting surface 322 is larger than the outer diameter of the second limiting surface 323. When the assembly or sealing member applies pressure to the first limiting surface 322, a relatively positive counter-support force can be provided to the second limiting portion 32 through the second connecting member 2, thereby enhancing the strength of the overall structure of the connection structure 100 and making it more solid and durable.

[0040] In some specific embodiments, the outer side of the second connecting member 2 is provided with a second threaded portion 22 for being arranged corresponding to the fourth threaded structure on the inner side of the mounting member. The second connecting member 2 is detachably connected by threading the second threaded portion 22 and the fourth threaded portion. The threaded connection facilitates adjustment of the tight fit between the mounting member and the connecting structure 100. In other embodiments, other structures such as snap-on connection can also be used for detachable connection. In other embodiments, the second threaded portion 22 can also be provided on the inner side of the second connecting member 2, so as to be suitable for the case where the fourth threaded structure is provided on the outer side of the mounting member.

[0041] like Figure 5-8 As shown, as another embodiment of the utility model, a joint assembly is also provided, which is used to connect with the end of a hose or other pipe fittings. The joint assembly includes the above-mentioned connection structure 100 and a set 200 that is connected to the first connection member 1. The end of the hose or other pipe fittings is directly connected to the first connection member 1 in the connection structure 100, or is indirectly connected to the first connection member 1 through a transition inner core. The set 200 is used to be sleeved on the outside of the connection position to protect the connection structure 100, the hose or other pipe fittings and the transition inner core and other structures from damage, thereby extending their service life. The set 200 includes a sleeve body 4, a connecting sleeve 5 connected to one end of the sleeve body 4, and a limiting sleeve 6 connected to the connecting sleeve 5 away from one end of the sleeve body 4. The inner side wall of the connecting sleeve 5 is provided with a third threaded portion 51 for threaded connection with the first connection member 1. A third inclined surface 61 is provided on the inner side wall of the limiting sleeve 6 from its free end toward the connecting sleeve 5, and the outer diameter of the third inclined surface 61 gradually decreases from its free end toward the direction close to the connecting sleeve 5. When the first connecting member 1 is connected with the kit 200, the first inclined surface 311 and the third inclined surface 61 are tightly connected by interference fit. Compared with the connection method in which planes abut against each other in the prior art, the inclined surface design structure is more stable and strong, and can achieve a deeper fit, which greatly improves the tightness and stability of the connection between the connecting structure 100 and the kit 200.

[0042] like Figure 8As shown, in some specific embodiments, the first inclined surface 311 is set as a smooth surface, and the limiting sleeve 6 is recessed inward from the third inclined surface 61 and is provided with a plurality of strip grooves 62 arranged along its circumferential direction, so as to form a toothed ring structure on the third inclined surface 61, which can further improve the tightness and stability of the connection between the connecting structure 100 and the set 200. In other embodiments, the strip groove 62 may not be provided.

[0043] like Figure 6 As shown, in some specific embodiments, the kit 200 also includes a spiral sleeve 7 connected to the sleeve body 4 at one end away from the connecting sleeve 5, which is used to provide a buffer force for the vertical swing of the hose and other pipe fittings relative to the connecting structure 100, thereby further protecting the hose and other pipe fittings from damage.

[0044] In some specific embodiments, the connection structure 100 is made of metal materials such as aluminum, copper, and steel, and the kit 200 is made of materials such as rubber and plastic, which have certain deformation properties and can be connected to the connection structure 100 more tightly and firmly.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model.

[0046] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A connection structure, characterized in that: include: A first connecting member, used for being connected in the external kit, wherein the first connecting member is provided with a first channel for docking with the external assembly member; A second connecting member, used for connecting with the external mounting member, wherein the second connecting member is provided with a second channel; An intermediate piece, one end of which is connected to the first connecting piece, and the other end of which is connected to the second connecting piece, and an intermediate channel connecting the first channel and the second channel is arranged inside the intermediate piece, the intermediate piece includes a first limiting portion arranged on the outer peripheral side of the protruding first connecting piece, a side surface of the first limiting portion close to the first connecting piece is arranged as a first inclined surface, and the outer diameter of the first inclined surface gradually increases from the end close to the first connecting piece toward the end close to the second connecting piece, so that when the first connecting piece and the kit are matched and connected, the first inclined surface and the corresponding third inclined surface arranged on the kit are tightly connected through interference fit.

2. The connection structure according to claim 1, characterized in that: The included angle between the first inclined surface and the outer wall of the first connecting member is 135° to 165°.

3. The connection structure according to claim 2, characterized in that: The included angle between the first inclined surface and the outer wall of the first connecting member is 143° to 153°.

4. The connection structure according to claim 3, characterized in that: The included angle between the first inclined surface and the outer wall of the first connecting member is 148°.

5. The connection structure according to claim 1, characterized in that: The outer side surface of the first connecting member is provided with a first threaded portion for being arranged corresponding to the third threaded portion on the inner side surface of the sleeve, and the first connecting member is detachably connected by threading the first threaded portion and the third threaded portion together.

6. The connection structure according to claim 1, characterized in that: The outer diameter of the second connecting member is smaller than the outer diameter of the first limiting portion, a side surface of the first limiting portion close to the second connecting member is provided with a second inclined surface, and the outer diameter of the second inclined surface gradually increases from an end close to the second connecting member toward an end close to the first connecting member, so that when the second connecting member is connected with the mounting member, the second inclined surface and a fourth inclined surface correspondingly arranged on the mounting member are tightly connected through interference fit; The middle piece has a first outer side surface coaxially arranged with the middle channel, one end of the first outer side surface is connected to an end of the first inclined surface away from the first connecting piece, and the other end is connected to an end of the second inclined surface away from the second connecting piece.

7. The connection structure according to any one of claims 1 to 6, characterized in that: The middle piece also includes a second limiting portion, which protrudes from the inner circumference of the first connecting piece to form a first limiting surface on a side of the second limiting portion close to the first connecting piece that can be against the assembly part or the sealing part. The middle channel runs through the second limiting portion, and the first limiting surface is arranged around the middle channel.

8. The connection structure according to claim 7, characterized in that: The middle channel is configured as a polygonal structure.

9. The connection structure according to claim 8, characterized in that: The middle channel is arranged in a hexagonal structure.

10. A joint assembly, characterized in that: It includes a connection structure as described in any one of claims 1 to 9, and a kit for cooperation with a first connecting piece, the kit including a sleeve body, a connecting sleeve connected to one end of the sleeve body, and a limiting sleeve connected to the connecting sleeve away from one end of the sleeve body, the inner side wall of the connecting sleeve is provided with a third threaded portion for threaded connection with the first connecting piece, the inner side wall of the limiting sleeve is provided with a third inclined surface from its free end toward the connecting sleeve, and the outer diameter of the third inclined surface gradually decreases from its free end toward the direction close to the connecting sleeve, and when the first connecting piece is cooperated with the kit, a tight connection is achieved through interference fit between the first inclined surface and the third inclined surface.

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