JP4698488B2 - Optical fiber cord with connector - Google Patents

Description

  The present invention relates to an optical fiber cord with a connector.

  As the optical fiber cord with a connector, various types of connection means for ensuring a reliable connection state between the optical fiber cord and the connector have been proposed since the connector is integrally connected to the tip of the optical fiber cord. As a typical example, for example, means using caulking is known.

The outline of the means using the caulking is that the caulking seat that protects the core wire is inserted between the optical fiber core wire and the tensile wire, while the caulking ring is fitted from above the tensile wire in the area of the caulking seat, This is a means for applying a force from the outer periphery of the fitted caulking ring and crimping it.
JP 2004-133371 A

  Conventional optical cords require a dedicated caulking seat that protects the core of the optical cord when crimped by caulking. In addition, since the tensile strength line and cord jacket of the optical cord are crimped and crimped to the crimping seat, the tensile strength line is not directly crimped to the stop ring on the connector side and is unstable against strong pulling in the pulling direction. Leaving the problem of making a bad connection.

  Accordingly, an object of the present invention is to provide an optical fiber cord with a connector that does not require a dedicated caulking seat and enables a crimping crimping of an optical fiber cord directly to the connector side, thereby obtaining a stable cord connection. To do.

In order to achieve the above object, according to the present invention, firstly, a connector housing provided with a connecting portion at the front end and a cord crimping fixing portion at the rear end, and a connecting portion of the connector housing are connected. An optical fiber cord having a cord reinforcing member that contacts the outer periphery of the fiber core wire and the cord crimping fixing portion, and a cord jacket that covers the cord reinforcing member, and the optical fiber cord includes: A caulking ring that is fitted to the cord crimping fixing portion from above and caulked to strongly press the cord reinforcing member to the outer periphery of the cord crimping fixing portion, and is integrally formed with the caulking ring, and the cord reinforcing member and the cord outside cylindrical envelope disconnect having a plurality of projections claws projecting cord outer inserted radially to bite the inside envelope of the code spread without tearing to be between human Is fixedly supported by the stopper the stopper portion, the protrusion claws, tapered guide portion inclined downward toward the engagement step rising from the outer periphery of the jacket retaining the stopper portion from the top portion of the engaging step portion in the insertion direction and is formed as a whole as a thin plate-like claws made of the outer code jacket in the region of the retaining stopper is characterized that you have fitted the pressing ring.

Second, a connector housing provided with a connecting portion at the front end and a cord crimping fixing portion at the rear end, a fiber core connected to the connecting portion of the connector housing, and an outer periphery of the cord crimping fixing portion. An optical fiber cord having a cord reinforcing member and a cord jacket covering the cord reinforcing member, and the optical fiber cord is fitted onto a cord crimping fixing portion from above the cord reinforcing member and is crimped to A caulking ring that strongly presses the reinforcing member on the outer periphery of the cord crimping fixing portion and the cord crimping fixing portion are formed integrally with each other, and the cord jacket is spread without tearing between the fiber core wire and the cord reinforcing member. inserted the cord reinforced member a cylindrical jacket retaining having a plurality of projections pawls projecting radially to bite the inside envelope of the code via stopper It is fixedly supported by the parts, the protrusion pawl from the engaging step portion rising from the outer periphery of the jacket retaining the stopper portion and the tapered guide portion inclined downward toward the top portion to the insertion direction of the engagement step made as a whole is formed as a thin plate-like claws, the outer code jacket in the region of the retaining stopper is characterized that you have fitted the pressing ring.
In the present invention, it is preferable that the presser ring is formed integrally with the caulking ring.
In the present invention, it is preferable that the protruding claws are provided at four locations in the radial direction, vertically and horizontally.

  According to the first and second aspects of the present invention, the cord reinforcing member of the optical fiber cord can be crimped and crimped directly to the outer periphery of the cord crimping fixing portion of the connector by the crimping ring. Also, the cord jacket generates a drag that prevents the force in the pulling direction by a plurality of protruding claws that bite inside the cord jacket, ensuring a reliable connection of the optical fiber cord to the connector while protecting the fiber core. Obtainable.

  In the first aspect of the present invention, since the outer cover stopper enters the inner side of the flexible cord jacket, it easily expands to the outer side as it enters. Can easily complete the insertion work.

  In the present invention, the cord reinforcing member of the optical fiber cord is squeezed by the caulking ring, and the outer jacket stopper stopper portion having a plurality of projecting claws that bite the cord jacket into the inner side of the cord jacket. In addition to the components to be fixedly supported, first, the presser ring is fitted to the cord jacket in the area of the jacket stopper stopper so that the cord jacket can be more securely retained. To do.

  Secondly, the protrusion claw has a shape of an engaging step portion that rises from the outer periphery of the outer sheath stopper stopper portion and a tapered guide portion that is inclined downward from the top of the engaging step portion toward the insertion direction. This makes it easy to enter the jacket without generating large insertion resistance, while at the time of completion of insertion, the force acting in the pull-out direction is concentrated on the plurality of protruding nails, and the strong bite function To prevent it from coming off.

  Hereinafter, the first embodiment of the present invention will be specifically described with reference to FIGS. 1 to 5.

  FIG. 1 is an exploded perspective view of an optical fiber cord with a connector according to a first embodiment of the present invention.

  The connector 3 of the optical fiber cord with connector 1 has a structure in which a connector housing 5 has a connecting portion 7 at the front end and a cord crimping fixing portion 9 is provided at the rear end. The connecting portion 7 is a ferrule in which a bare fiber core wire 13 of an optical fiber cord 11 inserted from the rear portion serving as the cord crimping fixing portion 9 is fixed with an adhesive, and is incorporated into the connector housing 5. It has a structured.

  The cord crimping fixing portion 9 is integrally extended from the connector housing 5 to the rear portion (right side in FIG. 1), and the cord reinforcing member 15 of the optical fiber cord 11 is crimped to the outer peripheral surface thereof. In this case, it is desirable to provide a conical guide surface 9 b that facilitates insertion on the outer peripheral surface of the cord crimping fixing portion 9.

  On the other hand, the optical fiber cord 11 has the above-described bare fiber core wire 13 at the center, a core wire sheath 17 made of an insulating material on the outer periphery thereof, and the outer periphery of the core wire sheath 17 is the above-described cord reinforcing member. 15, the outer periphery of which is the outermost cord jacket 21. The cord reinforcing member 15 is made of an aramid fiber having a high tensile strength, and the cord reinforcing member 15 is exposed by removing the end portion of the cord jacket 21 with a tool. The exposed cord reinforcing member 15 is expanded outward so that when the fiber core wire 13 is inserted from the rear portion serving as the cord crimping fixing portion 9, it comes into contact with the outer periphery thereof.

  FIG. 2 shows a connection state of the optical fiber cord 11. The cord reinforcing member 15 that is in direct contact with the cord crimping fixing portion 9 is placed on the outer periphery of the cord crimping fixing portion 9 by the crimping force F of the crimping ring 23. Crimped strongly.

  The cord jacket 21 is fixedly supported on the inner side by a jacket retaining stopper 25 and on the outer side by a presser ring 27.

  The outer sheath stopper stopper 25 is formed in a cylindrical shape and is integrally formed with the caulking ring 23 as shown in FIGS. 3 and 4 so that only one part is required.

  The outer sheath stopper stopper 25 is provided with a through-hole 29 through which the cord reinforcing member 15 of the optical fiber cord 11 passes in the central portion, and a projection claw 31 on the outer periphery.

  The projecting claws 31 are provided in four locations vertically and horizontally symmetrically in the radial direction. The protrusion claw 31 includes an engagement step portion 31a rising from the outer periphery of the outer sheath stopper stopper 25, and a taper guide portion 31b inclined downward from the top of the engagement step portion 31 in the insertion direction (arrow A). It is formed in the shape of a thin plate having The thin plate thickness acts to reduce the insertion resistance by reducing the contact area at the time of insertion, and acts on the inside of the cord jacket 21 by the four engagement step portions 31a after the insertion is completed. The purpose is to make the action of a strong bite work by concentrated load.

  On the other hand, the presser ring 27 is made of metal and has the same diameter as that of the cord jacket of the optical fiber cord 11, and is not caulked after the insertion is completed, and prevents the cord jacket 21 from spreading outward. This means is used to more reliably prevent the outer cover 21 from coming off.

  According to the optical fiber cord 1 with a connector configured in this way, as shown in FIG. 1, after inserting the press ring 27 and the cover sleeve 33 covering the entire connection region of the cord into the optical fiber cord 11 in advance, As shown in FIG. 3, a jacket retaining stopper portion 25 is inserted between the cord reinforcing member 15 and the cord jacket 21. At this time, the cord jacket 21 is inserted without encountering a large insertion resistance due to outward spreading. After the insertion is completed, the cord reinforcing member 15 is pushed and expanded in the caulking ring 23 toward the outer periphery, and is inserted into the cord crimping fixing portion 9 together with the caulking link 23 until it abuts against the connector end surface 5a. When the insertion is completed, since the fiber core wire 13 reaches the connecting portion 7 at the tip, the fiber core wire 13 is bonded and fixed with an adhesive. On the other hand, the crimping link 23 is crimped by applying a force F from the outside, and the cord reinforcing member 15 is directly crimped and fixed to the cord crimping fixing portion 9.

  Next, the presser ring 27 passed through in advance is moved to the outer sheath stopper stopper 25 to press the outer periphery of the cord outer sheath 21.

  As a result, the cord reinforcing member 15 is directly crimped and crimped to the cord crimping fixing portion 9, and the cord jacket 21 is dragged against the pulling direction by the protruding claws 31 that bite inward, so that the fiber core wire 13 is In a protected state, a reliable connection state strong in the disconnecting direction can be obtained.

  6 and 7 show the second embodiment.

  That is, the outer sheath stopper stopper 25 is replaced with the caulking ring 23 and is integrated with the cord crimping fixing portion 9 on the connector 3 side.

  Since the outer stopper stopper 25 has the through hole 29 at the center and the protrusion claw 31 on the outer periphery, it is the same as in the first embodiment, so the same reference numerals are used and detailed description is omitted.

  On the other hand, the caulking link 23 is integrated with the presser ring 27. In this case, the presser ring 27 that holds the cord jacket 21 may be independent of the caulking link 23.

  Therefore, according to the second embodiment, the cord reinforcing member 15 is brought into contact with the outer periphery of the cord crimping fixing portion 9 by inserting the cord reinforcing member 15 toward the cord crimping fixing portion 9 in the state of FIG. At the same time, the outer sheath stopper stopper 25 is inserted between the fiber core wire 13 and the cord reinforcing member 15. At this time, the protruding claws 31 act to bite into the inner side of the cord jacket 21 via the cord reinforcing member 15. Subsequently, the caulking link 23 is moved to the area of the cord crimping fixing portion 9, and the outer circumference of the cord jacket is pressed by a press ring. Next, the cord reinforcing member 15 is crimped and fixed to the inner circumference of the cord crimping fixing portion 9 by applying a force from the outer circumference of the crimping link 23 with a jig. On the other hand, the cord jacket 21 can obtain a reliable connection state with the jacket stopper stopper 25 in a state in which the fiber core wire 13 is held by the projection claw 31 that bites in from the inside.

The outline exploded perspective view of the optical fiber cord with a connector which showed a 1st embodiment concerning the present invention. FIG. 3 is a schematic cross-sectional view of the main part showing the connection state of the optical fiber cord. The cutaway view of the crimping ring in which the outer sheath stopper stopper part was integrally formed. FIG. 4 is a right side view of the caulking ring of FIG. 3. Operation | movement explanatory drawing which shows the connection state of an optical fiber cord. The outline | summary disassembled perspective view of the optical fiber cord with a connector similar to FIG. 1 which showed 2nd Embodiment. Operation | movement explanatory drawing of FIG. 6 which shows the connection state of an optical fiber cord.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Connector 5 Connector housing 7 Connection part 9 Cord crimping fixing part 11 Optical fiber cord 13 Fiber core wire 15 Cord reinforcement member 21 Cord jacket 23 Clamping ring 25 Cover stopper stopper part 27 Holding ring 29 Through-hole 31 Protrusion claw 31a Engagement step part 31b Taper guide part

Claims (4)

A connector housing having a connecting portion at the front end and a cord crimping fixing portion at the rear end, a fiber cord connected to the connecting portion of the connector housing, and a cord reinforcing member that contacts the outer periphery of the cord crimping fixing portion And an optical fiber cord having a cord jacket covering the cord reinforcing member,
The optical fiber cord is integrated with a caulking ring and a caulking ring that are fitted onto the cord crimping fixing part from above the cord reinforcing member and strongly crimps the cord reinforcing member to the outer periphery of the cord crimping fixing part. A cylindrical outer shell having a plurality of projecting claws that are formed and inserted between the cord reinforcing member and the cord jacket without breaking the cord jacket and projecting radially inside the cord jacket. It is fixedly supported by the object retaining stopper,
The protrusion claw is an overall thin plate-shaped member including an engaging step portion that rises from the outer periphery of the outer sheath stopper stopper portion and a taper guide portion that is inclined downward from the top of the engagement step portion toward the insertion direction. Formed as nails,
The envelope retaining stopper region code envelope to the fitting the pressing ring engages optionally with connector optical fiber cord, characterized in Rukoto of. A connector housing having a connecting portion at the front end and a cord crimping fixing portion at the rear end, a fiber cord connected to the connecting portion of the connector housing, and a cord reinforcing member that contacts the outer periphery of the cord crimping fixing portion And an optical fiber cord having a cord jacket covering the cord reinforcing member,
The optical fiber cord is integrated with a cord crimping fixing portion and a crimping ring that is fitted onto a cord crimping fixing portion from above the cord reinforcing member and strongly crimps the cord reinforcement member to the outer periphery of the cord crimping fixing portion. And extending in a radial direction between the fiber core wire and the cord reinforcing member without extending the cord jacket, and projecting radially into the cord jacket via the cord reinforcing member. It is fixedly supported by a cylindrical outer cover stopper portion having a protruding claw ,
The protrusion claw is an overall thin plate-shaped member including an engaging step portion that rises from the outer periphery of the outer sheath stopper stopper portion and a taper guide portion that is inclined downward from the top of the engagement step portion toward the insertion direction. Formed as nails,
The envelope retaining stopper region code coat the fitting retaining ring is engaged optionally with connector optical fiber cord according to JP characterized Rukoto of. The optical fiber cord with a connector according to claim 2, wherein the presser ring is formed integrally with the caulking ring. The optical fiber cord with a connector according to any one of claims 1 to 3, wherein the protruding claws are provided at four locations in a radial direction and vertically and laterally symmetrically.

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