JP4413390B2 - Connector and cord fixing method and fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and a structure for fixing various cords such as an optical fiber cord and an electric cord and a connector, and more particularly to a method and a structure suitable for fixing a multi-core optical fiber cord and an optical connector. .
[0002]
[Prior art]
An example of a conventional optical connector and optical fiber cord fixing structure will be described with reference to FIGS. 7 (a) and 7 (b), the optical fiber cord B from which the jacket (sheath) A is peeled off is inserted into the connector housing D, and the peeled jacket B is attached to the housing D. The outer end of the rear end E is covered, and the outer end B is crimped and fixed to the rear end E by crimping and deforming a ring-shaped stopper F covering the outer end B.
[0003]
[Problems to be solved by the invention]
The conventional fixing structure between the optical connector and the optical fiber cable is not particularly problematic when fixing a cord having a perfect cross-sectional shape such as a single-core optical fiber cord, but in the case of a multi-core cord. There were the following problems.
(1) Generally, a multi-fiber optical fiber cord, an electric cord, etc. have a horizontally long cross-sectional shape such as an ellipse or a rectangle. Therefore, if it is attempted to use a stopper having a perfect circular cross section similar to the conventional one for fixing them, the diameter of the stopper becomes very large.
(2) In order to solve the problem (1), when the cross-sectional shape of the stopper is made horizontally long according to that of the cord, the whole is pressurized (caulked) due to non-uniform shape. ) Becomes difficult. Specifically, as shown in FIG. 8, when the horizontally long stopper F is caulked with a conventional caulking jig G used for caulking a perfect circle stopper, the stopper F is locally deformed. In addition, the connector housing (not shown) on the inside may be damaged.
(3) If the connector housing is made of high-strength metal in order to solve the problem (2), the production cost of the housing increases. Further, as shown in FIG. 9, it is conceivable to provide a clearance (escape) H on both outer sides in the width direction of the inner space of the caulking jig G to avoid local deformation of the stopper F. Since the force also escapes outward in the width direction, the caulking force is insufficient and sufficient fixing strength cannot be obtained.
[0004]
[Means for Solving the Problems]
The object of the present invention is that even when a stopper having a horizontally long cross-sectional shape corresponding to the cross-sectional shape of the cord is used, the stopper is locally deformed, or the fixing strength is reduced due to insufficient caulking force. It is an object of the present invention to provide a connector and cord fixing method and a fixing structure which are not performed.
[0005]
In the first connector and the cord fixing method of the present application, the outer cover of the cord having a horizontally long cross-sectional shape is peeled off, the inner core wire is inserted into the connector, and the peeled outer cover is inserted into the core wire of the connector. Cover the outer end of the plug-side end, cover the outer cover with a ring-shaped stopper that has a cross-sectional shape corresponding to the cross-sectional shape of the cord, and press and deform the stopper with a caulking jig. The outer cover is crimped and fixed to the end portion on the insertion side of the core wire by means of a planar crimping portion formed at the center of each of the pair of horizontally long sides of the stopper by deformation, and surplus of the stopper caused by pressure deformation It is the fixing method which bulges a part in the opposite direction to the said pressurization direction on both sides of a crimping | compression-bonding part.
[0006]
In the second connector and the cord fixing method of the present application, a pressurizing part capable of forming a crimping part on the stopper as a caulking jig, and the stopper spreads laterally in the pressurizing direction by pressurization by the pressurizing part. A regulation part that regulates the pressure and a relief part that can receive the surplus part of the stopper that bulges in the direction opposite to the pressurization direction by the pressure applied by the pressure part and the regulation by the regulation part are used. .
[0007]
In the fixing structure of the first connector and the cord of the present application, the core wire of the cross-shaped laterally long cord from which the outer sheath is peeled is inserted into the connector and peeled to the outside of the end portion on the side where the core wire is inserted. The outer cover is covered with a ring-shaped stopper having a laterally long cross-sectional shape corresponding to the laterally long cross-sectional shape of the cord, and the outer cover is deformed by pressurizing and deforming the stopper. Crimped and fixed to the end of the core wire insertion side by planar crimping parts formed at the center of each of the pair of horizontally long sides, and bulging and deforming in the opposite direction to the pressurizing direction due to the pressure on both sides of the crimping part This is a fixed structure in which there is a surplus part.
[0008]
In the second connector and cord fixing structure of the present application, two or more surplus portions exist in the stopper.
[0009]
The third connector-cord fixing structure of the present application is the connector-cord fixing structure according to claim 3 or claim 4, wherein the outer sheath covering the outer end of the core wire insertion side is a stopper. It is sandwiched between opposing crimping parts and crimped and fixed to the end of the core wire insertion side, and a surplus part exists outside the crimping part of the stopper.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, an example of an embodiment of a connector and cord fixing structure of the present invention will be described. The connector and cord fixing structure shown in this embodiment is a structure for fixing the optical connector and the optical fiber cord. As shown in FIG. 2, in the optical fiber cord, a tensile body such as Kevlar (not shown) is disposed around a core wire 3 formed by covering a plurality of optical fibers at once, and the periphery thereof is a polymer such as polyvinyl chloride. This is a multi-core optical fiber cord 1 covered with a jacket 2 made of a material. As shown in FIG. 1, the optical connector includes a ferrule 30 attached to the tip of the cord 1 and a connector housing 32 that accommodates the ferrule 30, and the connector housing 32 is made of PBT (polybutylene terephthalate). , PPS (polyphenylene sulfide), PC (polycarbonate), or a plastic front material, or a composite material obtained by mixing a metal such as aluminum or brass with these materials, a housing front member 34, a housing intermediate member 36, and a housing rear member 38. ing.
[0011]
In the connector and cord fixing structure shown in the present embodiment, as shown in FIG. 1A, the outer cover 2 of the optical fiber cord 1 placed on the end portion 5 of the connector 4 (housing rear member 38) on the side where the core wire is inserted. Then, the ring-shaped stopper 6 inserted in advance in the optical fiber cord 1 is drawn and covered, and the stopper 6 is press-deformed into the shape shown in FIG. The outer cover 2 is fixed by crimping to the end 5 of the housing rear member 38 on the side where the optical fiber cord 1 and the optical connector 4 are fixed.
[0012]
Specifically, as shown in FIG. 2 (a), a ring-shaped stopper 6 placed on the outer side of the jacket 2 of the optical fiber cord 1 is caulked with a caulking jig (not shown), and the stopper As shown in FIG. 2B, the stopper 6 is pressed toward the inner side in the opposite direction (in the direction of the arrow a in the figure) by pressing each of the six long sides 40 facing each other toward the inner side in the opposite direction. Two flat crimping portions 8 slightly narrower than the width of the cord 1 are formed so as to oppose each other in the height direction of the cord 1, and the core wire insertion side end portion of the connector housing rear member 38 is formed by each crimping portion 8. An outer sheath 2 of the optical fiber cord 1 placed on the outer periphery 5 is fixed to the concentric wire insertion side end portion 5 by pressure. Further, when the long side portion 40 shown in FIG. 2 (a) is pressed in the direction of arrow a in the figure, the two short side portions 42 of the stopper 6 facing each other are located on the side in the pressing direction (in the drawing). By restricting spreading in the direction of arrow b), the pressure applied to the long side portion 40 is prevented from escaping in the direction of arrow b, and the crimping portion 8 is formed and the outer cover 2 formed by the formed crimping portion 8 is prevented. The crimping / fixing is surely and strong. As a result, both the outer side portions 44 in the longitudinal direction of the long side portion 40 shown in FIG. 2A are deformed so as to bulge in the direction opposite to the arrow a direction in the drawing, and both the width direction of the respective crimping portions 8 are both A surplus portion 9 (FIG. 2b) that is not in contact with the cord 1 is formed on the outside.
[0013]
As a caulking jig for realizing the connector and cord fixing structure of the present invention by caulking the stopper 6 shown in FIG. 2A as shown in FIG. Can be considered. As shown in the figure, the caulking jig 7 pressurizes the long side portion 40 of the stopper 6 toward the other long side portion 40 (in the direction of arrow a in FIG. 2a) facing the center in the longitudinal direction, A convex pressure part 10 capable of forming a crimping part 8 as shown in FIG. 2B is added to the stopper (6), and a short side part 42 of the stopper 6 is added by the pressure applied by the pressure part 10. The direction opposite to the pressurizing direction by the pressurizing unit 10 by the regulating unit 11 that regulates spreading in the pressure direction side (arrow b direction in FIG. 2A), pressurization by the pressurizing unit 10, and regulation by the regulating unit 11 The outer side 44 in the longitudinal direction of the long side portion 40 bulging out is received, and the stopper (6) is provided with a relief portion 12 capable of forming the surplus portion 9 as shown in FIG. 2 (b). A pair of caulking dies 50 is formed, and as shown in FIG. The stopper 6 is disposed on the outer sheath 2 of the optical fiber cord 1 placed on the end portion 5 of the core wire insertion side of the ging rear member 38), and the stopper 6 is caulked from above and below, thereby fixing the stopper. 6 can be pressure-deformed as shown in FIG. In addition, as for the clearance between the short side part 42 of the fastener 6 shown in FIG. 3, and the control part 11, about 0-0.2 mm is desirable. When the clearance is set to the above level, the contact position between the pressurizing portion 10 of the caulking jig 7 and the long side portion 40 of the stopper 6 is always determined at a predetermined position, and the short side portion 42 is further pressed by the pressurizing portion 10. Does not spread laterally in the pressurizing direction. Further, when the stopper 6 is caulked using the caulking jig 7 shown in FIG. 3, the thickness of the stopper 6 which was 0.2 to 0.4 mm before caulking, and 0.6 to 1.0 mm. The thickness of the outer cover 2 of the optical fiber cord 1 is compressed to 60 to 80%.
[0014]
As shown in FIG. 4, when the protrusion 20 is provided on the outer peripheral surface of the core wire insertion side end portion 5 of the housing rear member 38 and the stopper 6 is caulked as described above, the core wire insertion side is formed. The protrusions 20 can bite into the outer sheath 2 of the optical fiber cord 1 placed on the end portion 5 so that the connector 4 and the cord 1 can be more firmly fixed.
[0015]
The cord that can be fixed to the connector by the fixing structure of the present invention is not limited to the structure described above as long as the core wire is covered with the jacket, and is not limited to the optical fiber cord. Further, the structure of the connector that can be fixed to the cord by the fixing structure of the present invention is not limited to that described above.
[0016]
(Embodiment 2)
An example of an embodiment of the connector and cord fixing method of the present invention will be described with reference to FIGS. The fixing method of the present invention shown in this embodiment is for realizing the fixing structure of the present invention.
(1) As shown in FIG. 5A, one end of the optical fiber cord 1 is passed through the boot 60, the stopper 6, the housing rear member 38, and the housing intermediate member 36 in this order. The boot 60, the stopper 6, the housing rear member 38, and the housing intermediate member 36 are arranged in the order described above.
(2) The outer sheath (sheath) 2 on the distal end side of the optical fiber cord 1 protruding forward from the housing intermediate member 36 is removed to expose the core wire 3 to the outside.
(3) A spring 61 is wound around the outer periphery of the core wire 3 protruding forward from the housing intermediate member 36, the ferrule 30 is attached to the tip of the concentric wire 3, and the attached ferrule 30 is inserted inside the housing front member 34. To do. At this time, the ferrule 40 is inserted into the housing front member 34 until the front end surface protrudes outward from the front end of the housing front member 34 by a predetermined length. Further, the end surface of the ferrule 30 is subjected to polishing and other necessary end surface processing. The spring 61 serves to press the ferrule 30 toward the housing front member 34 to ensure optical coupling.
(4) The housing intermediate member 36 is pulled toward the housing front member 34, and a locking projection 63 provided on the front end of the intermediate member 36 is provided on the inner surface of the front member 34 (not shown). The housing front member 34 and the housing intermediate member 36 are joined together as shown in FIG.
(5) The housing rear member 38 is pulled toward the housing intermediate member 36, and the housing rear member 38 is put on the rear end of the housing intermediate member 36 to couple them as shown in FIG. At this time, as shown in FIG. 5 (b), the tensile body 65 protruding from the front end of the jacket 2 of the optical fiber cable 1 is connected to the rear end outer peripheral surface of the housing intermediate member 36 and the front inner peripheral surface of the housing rear member 38. The two are combined so as to be sandwiched between them.
(6) As shown in FIG. 6 (a), the outer cover 2 of the optical fiber cord 1 is placed on the outer side of the end portion 5 of the housing rear member 38, and then as shown in FIG. 6 (b). Next, the stopper 6 is pulled over and put on the outer cover 2 that covers the core wire insertion side end portion 5 of the housing rear member 38. At this time, as shown in FIG. 1A, if the notch 70 is made in the outer sheath 2, the outer end of the core wire insertion side end portion 5 is easily covered.
(7) The stopper 6 formed on the outer cover 2 is crimped by the caulking jig 7 shown in FIG. 3 and is pressure-deformed as shown in FIG. The jacket 2 is crimped and fixed to the end portion 5 on the insertion side of the core wire by the crimping portion 8 of the tool 6.
(8) As shown in FIG. 6 (b), the boot 60 is drawn to the side of the clamped stopper 6 and put on it.
[0017]
The order of the steps (1) to (8) is not necessarily limited to the order described above, and the stopper finally covered with the outer jacket of the cord is compressed and deformed as shown in FIG. If the inner cover can be crimped and fixed to the connector end of the connector by the crimping part of the stopper, the order is changed, some steps are omitted, and other steps are added. You can also.
[0018]
【The invention's effect】
The connector and cord fixing method and fixing method of the present application have the following effects.
(1) Since the surplus portion of the stopper generated by the pressure deformation is released, the stopper does not deform locally, and the crimping portion of the stopper presses the outer cover with the surface. Even if it is used, there is no possibility that the inner connector will be damaged.
(2) Since the surplus part bulges in the direction opposite to the pressurizing direction, the pressure applied to the stopper does not escape to the side of the pressurizing direction (outside in the width direction of the cord), and the connector and the cord are fixed. It will be reliable and strong.
(3) As described above, since the conventional problems that occur when using a horizontally long cross-section stopper are solved, it is particularly useful for fixing multi-core cords and connectors.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory views showing a state in which a jacket is placed on an end portion of a connector on which a core wire is inserted, and FIG. 1B is an explanatory view showing a stopper that is compressed and deformed by being put on the jacket.
2A is a cross-sectional view showing a stopper before being compressed and deformed, and FIG. 2B is a cross-sectional view showing the stopper that has been compressed and deformed.
FIG. 3 is a cross-sectional view showing an example of a caulking jig used in the connector and cord fixing method of the present invention.
FIG. 4 is an explanatory view showing a core wire insertion side end portion of a housing rear member in which a protrusion projects from an outer peripheral surface.
5A is an explanatory view showing one stage of the connector and cord fixing method of the present invention, and FIG. 5B is an explanatory view showing a stage after (a).
6A and 6B are explanatory views showing one stage of the connector and cord fixing method of the present invention, in which FIG. 6A is an explanatory view showing a stage after FIG. 5B, and FIG. Explanatory drawing which shows a later stage.
7A and 7B are cross-sectional views showing a conventional connector and cord fixing structure, wherein FIG. 7A is a vertical cross-sectional view, and FIG. 7B is a cross-sectional view.
FIG. 8 is a cross-sectional view showing a state in which a horizontally long stopper is caulked with a conventional caulking jig.
FIG. 9 is a cross-sectional view showing a state in which a horizontally long stopper is caulked with a caulking jig provided with a relief on the outer side in the width direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Code 2 Jacket | cover 3 Core wire 4 Connector 5 Core wire insertion side edge part 6 Stopper 7 Caulking jig 8 Crimp part 9 Surplus part 10 Pressurization part 11 Control part 12 Escape part

Claims (5)

The outer cover (2) of the cord (1) having a horizontally long cross-sectional shape is peeled off, the inner core (3) is inserted into the connector (4), and the peeled outer cover (2) is connected to the connector (4 ) On the outer side (5) of the core wire insertion side, and the outer cover (2) is covered with a ring-shaped stopper (6) having a cross-sectional shape corresponding to the cross-sectional shape of the cord (1). The stopper (6) is press-deformed by the caulking jig (7), and the sheet- like crimping part (8) formed at the center of each of the pair of horizontally long sides of the stopper (6) by the pressure deformation. ) And crimping and fixing the outer cover (2) to the end portion (5) on the insertion side of the core wire, and the surplus portions (9) of the stopper (6) caused by the pressure deformation on both sides of the crimping portion (8). A method for fixing a connector and a cord, wherein the connector and the cord are bulged in a direction opposite to the pressing direction .   The method for fixing a connector and a cord according to claim 1, wherein as the caulking jig (7), a pressurizing part (10) capable of forming a crimping part (8) on the stopper (6), and a pressurizing part (10) A restricting portion (11) for restricting the stopper (6) from spreading laterally in the pressurizing direction due to pressurization by the pressure, and a pressurizing direction by pressurization by the pressurizing portion (10) and restriction by the restricting portion (11) A method for fixing a connector and a cord, comprising using a relief portion (12) capable of receiving the surplus portion (9) of the stopper (6) bulging in the opposite direction. The core wire (3) of the cord (1) having a cross-sectional shape with the outer cover (2) peeled off is inserted into the connector (4), and the outer side of the end portion (5) of the connector (4) on the core wire insertion side The outer cover (2) peeled off is covered, and the outer ring (2) is covered with a ring-shaped stopper (6) having a horizontal cross-sectional shape corresponding to the horizontal cross-sectional shape of the cord (1). The outer cover (2) is inserted into the core wire by a planar crimping part (8) formed at the center of each of the pair of horizontally long sides of the stopper (6) when the stopper (6) is pressure-deformed. A connector characterized in that there are surplus parts (9) which are crimped and fixed to the side end part (5) and bulged and deformed in the opposite direction to the pressurizing direction by the pressurization on both sides of the crimping part (8) ; Fixed structure of cord.   The connector and cord fixing structure according to claim 3, wherein two or more surplus portions (9) are present in the stopper (6).   In the connector and cord fixing structure according to claim 3 or 4, the outer cover (2) placed on the outer side of the core wire insertion side end (5) is a crimping part (6) facing the stopper (6). 8) A connector which is sandwiched between and fixed to the end portion (5) inserted into the core wire, and has a surplus portion (9) outside the crimp portion (8) of the stopper (6). And cord fixing structure.

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