Novel high-strength tensile LC type rubber-covered wire crimping connector and connection method

Abstract

The invention relates to a novel high-strength tensile LC type rubber-covered wire crimping connector and a connection method. The plug pin comprises a plug pin body, the plug pin body comprises a plug pin body front section and a plug pin body tail handle axially extending along the plug pin body front section, the plug pin body tail handle is provided with an inner hole axially extending, and the plug pin body is provided with a jack which is communicated with the inner hole and extends towards the front end; the inner hole is filled with curable glue, two reinforcing steel wires of the butterfly-shaped optical cable penetrate into the inner hole by a first preset length, and the inner hole and the jack jointly define a through hole for an optical fiber of the butterfly-shaped optical cable to penetrate through; the shell assembly comprises a front shell and a rear shell which are matched with each other, the front shell and the rear shell jointly define a containing hole for containing the contact pin body, and a tail handle of the contact pin body is provided with an extending section extending out of the rear shell by a second preset length; and the crimping clamp is respectively in crimping fit with the extension section and the butterfly-shaped optical cable. The reliability and durability of the connector are improved, and the high-strength tensile application requirement is met.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a novel high-strength tensile LC-type drop wire crimp connector and its connection method. Background Technology

[0002] In applications such as optical communication access networks and indoor cabling, drop cables are widely used due to their ease of installation and low cost. The drop cable connectors, as key termination components of optical fiber transmission links, directly affect the long-term stable operation of the communication network through their mechanical reliability and optical stability. Especially in scenarios such as user-side access, low-voltage box cabling, fiber-to-the-home terminals, and equipment room patching upgrades, the connectors not only need to meet optical specifications such as insertion loss and return loss, but also need sufficient tensile, bending, and vibration resistance to cope with laying pulls, cabinet organization, repeated plugging and unplugging, equipment movement, and occasional external force pulling.

[0003] In the current market, SC and FC type drop cable connectors are more common, with mature structures and processes, and wide applicability, thus occupying a large market share. In contrast, LC type connectors have advantages such as small size, high port density, and convenient insertion and removal, making them suitable for fiber optic connections in high-density cabling and space-constrained equipment. However, LC type connectors still have significant shortcomings in mechanical reliability in butterfly drop cable termination applications, especially in terms of insufficient tensile strength.

[0004] Taking a conventional LC-type drop cable connector as an example, its tail-end fixing structure typically uses a short tail shank with a transparent tube or sleeve for transition, and is clamped and fixed to the outer sheath by a crimping device. This type of structure has limited tensile strength under actual stress, resulting in significant local stress concentration. Tensile and bending stresses are more easily superimposed in the area near the ferrule tail shank, which can easily induce loosening, slippage, or structural fatigue with long-term use. Furthermore, during insertion / removal or under external pulling conditions, the ferrule assembly may experience relative displacement or local bending of the optical fiber.

[0005] Therefore, the tensile strength of a conventional LC type drop cable connector is usually only about 30N to 40N. In usage scenarios where frequent mobile equipment is needed, the cabling is handled with great force, or there is external traction or vibration, the connector is prone to loosening, falling off, or even being damaged, thus affecting the reliable operation of the fiber optic communication system. Summary of the Invention

[0006] Therefore, the present invention provides a novel high-strength tensile LC-type crimp connector and connection method. By redesigning the internal component layout and force path of the connector, the tensile force can be more effectively distributed and transmitted, enhancing the stability of the tail end fixation, thereby improving the reliability and durability of the connector and meeting the requirements of high-strength tensile applications.

[0007] To solve the above technical problems, the present invention provides a novel high-strength tensile LC-type drop wire crimp connector, comprising: The insert body includes a front section of the insert body and a tail section of the insert body extending axially along the front section of the insert body. The tail section of the insert body has an axially extending inner hole. The insert body has a socket that communicates with the inner hole and extends towards the front end. The inner hole is filled with curable adhesive. The inner hole allows two reinforcing steel wires of the butterfly optical cable to pass through the inner hole for a first predetermined length. The inner hole and the socket together define a through hole for the optical fiber of the butterfly optical cable to pass through. The housing assembly includes a front housing and a rear housing that cooperate with each other, the front housing and the rear housing together defining a receiving hole for receiving the pin body, wherein the tail shank of the pin body has an extension section extending out of the rear housing for a second predetermined length; The crimping ring is crimped and fitted to the protruding section and the butterfly optical cable, respectively.

[0008] In one embodiment of the present invention, the front section of the insert body is made of ceramic.

[0009] In one embodiment of the present invention, the tail shank of the pin body is made of zinc alloy.

[0010] In one embodiment of the present invention, the first predetermined length is 4mm-5mm.

[0011] In one embodiment of the present invention, the second predetermined length is 4mm-5mm.

[0012] In one embodiment of the present invention, the crimping ring is a sleeve structure with stepped holes, the small inner diameter end of which is crimped with the protruding section of the pin body tail shank, and the large inner diameter end of which is crimped with the butterfly optical cable.

[0013] In one embodiment of the present invention, the front shell is provided with a plug-in cavity, and the rear shell is provided with a plug-in ring wall that plugs into and mates with the plug-in cavity.

[0014] In one embodiment of the present invention, the side wall of the insertion cavity is provided with a positioning hole, and the insertion ring wall is provided with a positioning buckle that positions and cooperates with the positioning hole.

[0015] In one embodiment of the present invention, a limiting head is provided at the front section of the pin body, and a spring is sleeved on the tail shank of the pin body; The receiving hole is a stepped hole, and the springs abut against the bottom wall of the stepped hole and the limiting head respectively, so as to provide the limiting head with a force away from the bottom wall of the stepped hole.

[0016] This invention also provides a novel high-strength tensile LC-type crimped connector method, utilizing the aforementioned novel high-strength tensile LC-type crimped connector, the connection method comprising: Fill the inner hole of the pin body tail shank with curable adhesive; The optical fiber of the butterfly-shaped optical cable is inserted into the through hole defined by the inner hole and the jack, so that the optical fiber extends along the axial direction of the jack body; The two reinforcing steel wires of the butterfly-shaped optical cable are inserted into the inner hole to a first predetermined length, so that the optical fiber and the two reinforcing steel wires are located in the inner hole and in contact with the curable adhesive. The curable adhesive is cured to form a bonded connection between the optical fiber and the two reinforcing steel wires within the inner hole. Insert the pin body into the receiving hole of the housing assembly, so that the tail shank of the pin body passes through the rear housing axially and forms an extension section extending out of the rear housing by a second predetermined length. The crimping ring is fitted onto the outer periphery of the protruding section and crimped, so that the crimping ring and the protruding section are crimped together. Continue crimping the crimping ring until it is crimped and engaged with the butterfly optical cable, thereby completing the tensile connection between the butterfly optical cable and the housing assembly and the ferrule.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses a novel high-strength, tensile-resistant LC-type drop cable crimp connector and its connection method. By providing an axially extending inner hole within the ferrule's tailstock, and allowing two reinforcing steel wires of the butterfly optical cable to pass through this inner hole at a predetermined length and participate in the curing process of the curable adhesive, a stable adhesive-bonded connection structure is formed between the reinforcing steel wires and the optical fiber within the ferrule's tailstock. Compared to existing technologies that rely solely on outer sheath crimping or transparent tube attachment for fixation, this invention directly introduces the inherently high tensile-strength reinforcing steel wires from the butterfly optical cable into the connector's load-bearing structure. This allows external tensile force to be transmitted step-by-step through the reinforcing steel wires, the adhesive anchoring structure, the ferrule's tailstock, and the housing assembly, fundamentally improving the connector's tensile strength.

[0018] This invention uses a curable adhesive to form a bonded connection between the extended inner hole of the pin body tail and the existing technology. At the same time, a crimping ring is set at the protruding section of the pin body tail that extends out of the rear shell to crimp and fix the pin body tail to the butterfly optical cable. This not only avoids the loosening and slippage problems that may occur in long-term use with a single crimping or adhesive method, but also significantly improves the reliability of the connector under continuous tensile force, impact tensile force and vibration conditions.

[0019] The novel high-strength tensile LC-type drop cable crimp connector of this invention conforms to the general standards of existing LC connectors in terms of external dimensions, interface type, and assembly method. Performance improvement is achieved solely through internal structural and process optimization, without affecting compatibility with existing equipment, patch panels, and modules, facilitating direct replacement and widespread application in existing optical communication systems. Through the aforementioned synergistic optimization of structure and process, the tensile strength of this novel LC-type drop cable crimp connector can stably reach over 70N, significantly superior to the approximately 30N-40N tensile strength of conventional LC-type drop cable connectors. This meets the application requirements for high-strength, high-reliability connectors in fiber-to-the-home, low-voltage box cabling, high-density equipment room connections, and complex construction environments. Attached Figure Description

[0020] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is an exploded structural diagram of the novel high-strength tensile LC-type wire crimp connector of the present invention.

[0022] Figure 2 This is a diagram showing the connection structure between the novel high-strength tensile LC-type drop wire crimp connector and the butterfly optical cable of this invention.

[0023] Figure 3 This is an overall structural diagram of the novel high-strength tensile LC-type wire crimp connector of the present invention.

[0024] Figure 4 This is a structural diagram of the crimping ring of the present invention.

[0025] Explanation of reference numerals in the instruction manual: 1. Pin body; 11. Front section of pin body; 12. Tail shank of pin body; 121. Inner hole; 122. Protruding section; 13. Insertion hole; 14. Curable adhesive; 15. Limiting head; 16. Spring; 2. Housing assembly; 21. Front housing; 211. Insertion cavity; 212. Positioning hole; 22. Rear housing; 221. Insertion ring wall; 222. Positioning buckle; 23. Accommodation hole; 3. Crimped tie ring; 31. Stepped hole; 311. Small inner diameter hole end; 312. Large inner diameter hole end; 4. Butterfly-shaped optical cable; 41. Reinforcing steel wire; 42. Optical fiber. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0027] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0028] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0030] Reference Figure 1 , Figure 2 As shown, this embodiment provides a novel high-strength tensile LC-type drop wire crimp connector, comprising: The insert body 1 includes a front section 11 and a tail section 12 extending axially along the front section 11. The tail section 12 has an axially extending inner hole 121. The insert body 1 has a socket 13 communicating with the inner hole 121 and extending towards the front end. The inner hole 121 is filled with curable adhesive 14. The inner hole 121 allows two reinforcing steel wires 41 of the butterfly optical cable 4 to pass through the inner hole 121 for a first predetermined length. The inner hole 121 and the socket 13 together define a through hole for the optical fiber 42 of the butterfly optical cable 4 to pass through. The housing assembly 2 includes a front housing 21 and a rear housing 22 that cooperate with each other. The front housing 21 and the rear housing 22 together define a receiving hole 23 for receiving the pin body 1. The tail shank 12 of the pin body has an extension section 122 that extends out of the rear housing 22 by a second predetermined length. The crimping ring 3 is crimped and fitted to the protruding section 122 and the butterfly optical cable 4, respectively.

[0031] In one embodiment, the front section 11 of the pin body is made of ceramic.

[0032] In one embodiment, the pin body shank 12 is made of zinc alloy. This alloy possesses high strength, hardness, and toughness, while also exhibiting good corrosion resistance, thus improving overall tensile strength while maintaining structural reliability.

[0033] In one embodiment, the first predetermined length is 4mm-5mm.

[0034] In one embodiment, the second predetermined length is 4mm-5mm.

[0035] In one embodiment, refer to Figure 4 As shown, the crimping ring 3 is a sleeve structure with a stepped hole 31. Its small inner diameter hole end 311 is crimped with the protruding section 122 of the pin body tail shank 12, and its large inner diameter hole end 312 is crimped with the butterfly optical cable 4.

[0036] In one embodiment, refer to Figure 3 As shown, the front shell 21 is provided with a insertion cavity 211, and the rear shell 22 is provided with an insertion ring wall 221 that is inserted into the insertion cavity 211. The side wall of the insertion cavity 211 is provided with a positioning hole 212, and the insertion ring wall 221 is provided with a positioning buckle 222 that is positioned and engaged with the positioning hole 212.

[0037] In one embodiment, the front section 11 of the pin body is provided with a limiting head 15, and the tail shank 12 of the pin body is sleeved with a spring 16; The receiving hole 23 is a stepped hole 31. The spring 16 abuts against the step bottom wall of the step hole 31 and the limiting head 15 respectively, so as to provide the limiting head 15 away from the step bottom wall.

[0038] It should be noted that the new high-strength tensile LC-type drop wire crimp connector conforms to industry standards in terms of external dimensions. Through optimization of internal structure and material system, tensile performance is improved without changing the interface size and assembly method, while ensuring compatibility with existing equipment.

[0039] The dimensions of the pin body tail shank 12 are: length 19mm, outer diameter 1.85mm, and inner diameter 1mm. This design ensures sufficient structural strength while facilitating stable and precise assembly with other components. After assembly, the pin body tail shank 12 extends approximately 4mm-5mm beyond the rear housing 22 and engages with the crimping ring 3, forming an integrated connection between the pin body tail shank 12 and the butterfly optical cable 4 via crimping. The crimping ring 3 employs a stepped hole 31 sleeve structure, with an inner diameter of 2.0mm at one end and 3.0mm at the other, and a length of 8mm. During connection, a dedicated crimping tool is used to crimp and secure the tail shank extension 122 and the butterfly optical cable 4, thereby improving the bonding strength and tensile stability between the connector and the optical cable.

[0040] To further improve the reliability and durability of LC connector components, the manufacturing process was optimized. During production, the inner hole 121 of the pin body tail shank 12 is first filled with curable adhesive 14. This curable adhesive 14 features high strength after curing and stable bonding performance, ensuring a strong bond between the optical fiber 42 and the reinforcing steel wire 41 within the tail shank. Subsequently, while the optical fiber 42 is being inserted normally, the two reinforcing steel wires 41 of the butterfly optical cable 4 are simultaneously inserted into the inner hole 12 of the tail shank to a depth of 4mm-5mm. This allows the reinforcing steel wires 41 to participate in the curing process, thereby introducing their load-bearing capacity into the connector's stress path and making them a significant contributor to the connector's overall tensile strength (primarily utilizing the strong tensile force of the reinforcing steel wires 41, converting it into part of the connector's overall tensile strength).

[0041] After completing the above adhesive anchoring, the extended ferrule metal tail shank is then crimped and fixed to the butterfly optical cable 4 using the crimping ring 3. This combined fixing method creates a load transfer structure that combines adhesive anchoring and mechanical crimping between the butterfly optical cable 4 and the connector, effectively reducing the risk of loosening, slippage, or detachment caused by external tension. Compared with conventional LC component processes, this solution achieves significant improvements in force mechanism and structural path. Conventional LC components typically involve injecting adhesive into the ferrule tail shank 12 and then inserting the optical fiber 42 for curing, relying mainly on the small amount of overflowing adhesive to attach and fix the transparent tube; the two reinforcing steel wires 41 of the butterfly optical cable 4 are usually flush with the sheath and cannot penetrate deep into the transparent tube to participate in curing and anchoring, ultimately relying mainly on the crimping and fixing of the sheath by the rear crimping ring 3 to bear the tension. Meanwhile, in conventional structures, the metal part of the ferrule 12 is relatively short, typically only about 6mm, and the rear end is often transitioned with a transparent tube of about 12mm. The optical fiber 42 needs to be inserted into the front ceramic ferrule 1 through the transparent tube for curing, which makes it difficult for the reinforcing steel wire 41 to enter the ferrule area to form an effective anchor, thus limiting the space for improving tensile strength.

[0042] After structural optimization and process improvement, the tensile strength of the novel LC connector in this embodiment is significantly improved, capable of withstanding tensile forces exceeding 70N, which is significantly higher than the approximately 40N level of conventional LC connectors. Due to the synergistic optimization of the material system and the holding method, the overall connector structure is more robust and can more effectively resist the effects of external environmental factors such as moisture, dust, and vibration. The improved crimping method not only enhances the clamping stability between the connector and the butterfly optical cable 4 but also further reduces the risk of loosening during long-term use, thereby improving reliability and service life.

[0043] Furthermore, the new LC connector also offers advantages in terms of docking stability. The extended ferrule tail 12 is crimped together with the butterfly optical cable 4 via the crimping ring 3, creating a unified, coordinated structure between the rear butterfly optical cable 4 and the ceramic ferrule front section 11. During connector docking, even if bending occurs, the axial displacement of the ferrule 1 under pressure and the bending of the optical fiber 42 can change in a coordinated manner as a whole, reducing the likelihood of localized stress concentration. In contrast, conventional LC connectors typically crimp the rear shell 22 thin ring together with the butterfly optical cable 4, fixing and constraining the rear optical cable and rear shell 22. The bending stress generated during docking is mainly concentrated in the short section from the ceramic ferrule tail 1 to the drop sheath. If the optical fiber 42 is not sufficiently straightened during manufacturing, it can easily lead to problems such as insertion loss at 1550nm wavelength, thus affecting the communication quality of the optical fiber 42. The new structure effectively reduces these risks and improves the signal transmission consistency of the optical fiber 42 through optimization of the force path and constraint boundaries.

[0044] The development and application of this new high-strength tensile LC-type drop wire crimp connector provides the market with a connection solution with higher tensile strength and higher reliability, which can meet users' actual needs for high-quality connectors. It also provides a reusable technical route for connector structural strengthening and process optimization, and has a positive role in promoting product upgrades and technological iterations in the optical communication industry.

[0045] This embodiment also provides a novel high-strength tensile LC-type crimp connector method. Utilizing the novel high-strength tensile LC-type crimp connector, the connection method includes: The curable adhesive 14 is filled into the inner hole 121 of the pin body tail 12; A section of the outer sheath of the butterfly optical cable 4 is stripped off, exposing two reinforcing steel wires 41 and the optical fiber 42 in the middle; the optical fiber 42 of the butterfly optical cable 4 is inserted into the through hole defined by the inner hole 121 and the insertion hole 13, so that the optical fiber 42 extends along the axial direction of the insertion pin body 1. The two reinforcing steel wires 41 of the butterfly optical cable 4 are inserted into the inner hole 121 and reach a first predetermined length, so that the optical fiber 42 and the two reinforcing steel wires 41 are located in the inner hole 121 and in contact with the curable adhesive 14. The curable adhesive 14 is cured, so that the optical fiber 42 and the two reinforcing steel wires 41 are bonded together in the inner hole 121. Insert the pin body 1 into the receiving hole 23 of the housing assembly 2, so that the tail shank 12 of the pin body passes through the rear shell 22 axially and forms an extension section 122 that extends out of the rear shell 22 for a second predetermined length. The crimping ring 3 is fitted onto the outer periphery of the protruding section 122 and crimped, so that the crimping ring 3 and the protruding section 122 are crimped together. Continue crimping the crimping ring 3 until it is crimped and engaged with the butterfly optical cable 4, thereby completing the tensile connection between the butterfly optical cable 4, the housing assembly 2, and the pin body 1.

[0046] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A novel high-strength tensile LC-type crimp connector, characterized in that, include: The pin body (1) includes a front section (11) of the pin body and a tail shank (12) of the pin body extending axially along the front section (11). The tail shank (12) of the pin body has an inner hole (121) extending axially. The pin body (1) has a socket (13) communicating with the inner hole (121) and extending to the front end. The inner hole (121) is filled with curable adhesive (14). The inner hole (121) allows the two reinforcing steel wires (41) of the butterfly optical cable (4) to pass through the inner hole (121) for a first predetermined length. The inner hole (121) and the socket (13) together define a through hole for the optical fiber (42) of the butterfly optical cable (4) to pass through. The housing assembly (2) includes a front housing (21) and a rear housing (22) that cooperate with each other, the front housing (21) and the rear housing (22) together defining a receiving hole (23) for receiving the pin body (1), wherein the pin body tail shank (12) has an extension (122) extending out of the rear housing (22) for a second predetermined length. The crimping ring (3) is crimped to the protruding section (122) and the butterfly optical cable (4), respectively.

2. The novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The front section (11) of the insert body is made of ceramic.

3. The novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The pin body tail shank (12) is made of zinc alloy.

4. The novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The first predetermined length is 4mm-5mm.

5. A novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The second predetermined length is 4mm-5mm.

6. A novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The crimping ring (3) is a sleeve structure with a stepped hole (31). Its small inner diameter hole end (311) is crimped with the protruding section (122) of the pin body tail shank (12), and its large inner diameter hole end (312) is crimped with the butterfly optical cable (4).

7. A novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The front shell (21) is provided with a plug-in cavity (211), and the rear shell (22) is provided with a plug-in annular wall (221) that is plugged into the plug-in cavity (211).

8. A novel high-strength tensile LC-type crimp connector according to claim 7, characterized in that, The side wall of the insertion cavity (211) is provided with a positioning hole (212), and the insertion ring wall (221) is provided with a positioning buckle (222) that is positioned and engaged with the positioning hole (212).

9. A novel high-strength tensile LC-type crimp connector according to claim 1, characterized in that, The front section (11) of the pin body is provided with a limiting head (15), and the tail shank (12) of the pin body is sleeved with a spring (16). The receiving hole (23) is a stepped hole (31), and the spring (16) abuts against the step bottom wall of the step hole (31) and the limiting head (15) respectively, so as to provide the limiting head (15) away from the step bottom wall.

10. A novel high-strength tensile LC-type wire crimping connection method, characterized in that, The connection method using the novel high-strength tensile LC-type crimp connector according to any one of claims 1-9 includes: The curable adhesive (14) is filled into the inner hole (121) of the pin body tail shank (12); Insert the optical fiber (42) of the butterfly optical cable (4) into the through hole defined by the inner hole (121) and the jack (13), so that the optical fiber (42) extends along the axial direction of the jack body (1); The two reinforcing steel wires (41) of the butterfly optical cable (4) are inserted into the inner hole (121) and reach a first predetermined length, so that the optical fiber (42) and the two reinforcing steel wires (41) are located in the inner hole (121) and in contact with the curable adhesive (14). The curable adhesive (14) is cured so that the optical fiber (42) and the two reinforcing steel wires (41) are bonded together in the inner hole (121). Insert the pin body (1) into the receiving hole (23) of the housing assembly (2), so that the pin body tail shank (12) passes through the rear shell (22) axially and forms an extension section (122) extending out of the rear shell (22) for a second predetermined length. The crimping ring (3) is fitted onto the outer periphery of the protruding section (122) and the crimping ring (3) is crimped to make the crimping ring (3) and the protruding section (122) crimped together. Continue to crimp the crimping ring (3) so that the crimping ring (3) is crimped and engaged with the butterfly optical cable (4), thereby completing the tensile connection between the butterfly optical cable (4) and the housing assembly (2) and the pin body (1).

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