JPH0355923Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a structure for fixing a lead-out cable in an optical connector housing hood.

(Prior art and its problems) In a connector, it is possible to house the plug connector or both the plug connector and the receptacle connector in a hood to protect the connection between the connector and the cable, and furthermore to shield the hood by making it metal. It is being done. Incidentally, in the cable pull-out section of the hood, the cable is generally fixed with a clamp fitting or the like to prevent the connection between the connector and the cable from being disturbed by external tensile force or bending force applied to the pulled-out cable. In this case, most of the cables used in multi-pole electrical connectors are multi-core, and even when single-core cables are used, they are bundled and fixed. However, the cables used for optical fiber connectors are often both single-core and multi-core, and in the case of a single-core, multiple cables 1 are spaced apart as shown in Figure 1. It is often required to pull them out from the hood 2 in a parallel state. Therefore, from the viewpoint of manufacturing costs, it is ideal to be able to easily fix a multi-core cable and a single-core cable in parallel without changing the structure of the hood, which is convenient for use.

In addition, ferrules 2, which are susceptible to bending like optical fibers and which hold the optical fiber 1 at the center so that the end face is exposed as shown in FIG. , as shown in Fig. 2b, the optical fiber is inserted into the sleeve 5 having a split 6 and connected by butting the end surfaces of the optical fibers exposed by the spring body 3 while maintaining concentricity. Butt connections are easily hindered by tensile force, bending force, etc. Therefore, it is necessary to securely fix it.

However, for example, as shown in FIG. 3, the other end of the clamp fitting 8 fixed to one end of the pedestal 7 having a semicircular notch 7a for placing the cable is fixed to the pedestal 7. If the cable 9 is tightened to crush the jacketed cable 9 to secure it, there is a concern that it will not be possible to securely fix something with a small diameter such as a single-fiber optical fiber cable, and it may also be difficult to securely fix something with a small diameter such as a single-fiber optical fiber cable. It is difficult to provide a fixing structure for parallel cables with a much smaller diameter on the same hood.

This invention creates a common fixing device for single-core cables and multi-core cable clamp fittings, and fixes the fixing device that holds the clamp fitting inside a hood with the same structure to hold it in place, so that the same connector hood can be used. This allows single-core cables to be fixed in parallel and multi-core cables to be fixed using the same method. Next, the details will be explained using the drawings.

[Structure of the idea]

(Means and effects for solving the problems) Figures 4a, b, and c are exploded perspective views showing one embodiment of the present invention, and Figure 5 is a perspective view showing an assembled state, and shows the present invention in an assembled state. The features are as follows.

That is, as shown in FIG.
Fixture support grooves 12 are provided on both left and right sides of the fixing device.

On the other hand, apart from this, there are clamp fittings 13, 14, that is, clamping parts 13a, 14b on the left and right, and a retaining part 13b having a larger diameter than the clamping parts 13a, 14b in the center.
14b as well as single-core and multi-core clamps having cable insertion holes 13c and 14c having an exterior at the center. In addition, separately from this, the forming portions 15a, 15 of the first and second fixtures 15 are
b, that is, the retaining part insertion groove 16 of the single-core clamp fitting
A semi-retaining groove 16 of the clamp fitting consisting of a and a tightening part insertion groove 16b is provided on one side of the clamp fitting corresponding to the parallel arrangement spacing of the single-core cables, and a multi-core clamp fitting is provided on the other side, for example, in the center. Fixture forming parts 15a and 15b having a semi-retaining groove 17 and having fixing protrusions 18 on the left and right sides thereof, respectively.
form. and the fifth in the case of single-core cables.
As shown in the figure, cable 9 with connector 19 connected
The clamp fitting 13, which is tightened and fixed through the
After each of them is inserted into the half-insertion groove 16, the left and right fixing protrusions 18 of the first forming part 15a are inserted into the fixture support groove 12 of the first forming part 1a forming the hood and fixed. Next, the second forming part 1 of the other fixture
5b, and finally fix the left and right fixing protrusions 1.
By overlapping and bonding the second hood forming portions 10b such that the single-core cables 8 are placed in the support grooves 12, the single-core cables are fixed at predetermined intervals at the draw-out portion of the hood.

In addition, when fixing a multi-core cable, hold the multi-core clamp fittings 14 by overlapping them so that the multi-core semi-retaining grooves 17 face each other, and then use the same method to hold the multi-core clamp fittings 14 on the first forming part 10a of the hood. After being housed inside, the second forming portion 10b is held on top of the other.

(Effect) By doing the above, you can fix both single-core and multi-core cables in the same hood using the same fixing tool, just by selecting the clamp fitting and fixing it to the single-core or multi-core cable. . Therefore, it is extremely convenient to use. In addition, there is no need to make separate hood molds for single-core and multi-core molds compared to the mold for molding fixtures, which is advantageous in terms of production costs, and fixtures can also be made from the same mold, making production easier. It is advantageous. In addition, with this invention, the clamp fitting can be fixed simply by sandwiching it between the fixture forming parts and inserting its fixing protrusion into the support groove, so it takes almost the same amount of time and is easy to fix, as compared to the conventional fixing structure that uses clamp fittings by tightening screws. In addition, if the clamp fitting is securely fixed to the cable using a crimping device, the step-shaped retention part of the clamp fitting can be reliably pulled against the tensile force by the step-shaped insertion groove of the fixing device. It can be kept. Therefore, unlike conventional clamp fittings, there is no risk of the cable moving and applying force to the connector connection due to insufficient tightening of the fixing screw.
There is little risk of interfering with the connection between optical fibers.

[Brief explanation of the drawing]

Figures 1 and 2 a and b are diagrams illustrating the method of pulling out the optical fiber cable and the connection structure of the optical connector; Figure 3 is a diagram illustrating an example of a conventional cable fixing method; Figures 4 and 5; 1 is an exploded perspective view showing an embodiment of the present invention and a partially sectional perspective view showing an assembled state. 1... Optical fiber, 2... Ferrule, 3...
Spring body, 4... Connector housing, 5... Sleeve, 6... Split, 7... Pedestal, 7a... Cable placement part, 8... Clamp fitting, 9... Cable,
10a, 10b...first and second forming portions of the hood, 11...cable pull-out opening, 12...
Fixture support groove, 13, 14...Clamp fitting, 1
3a, 14a...Tightening part, 13b, 14b...Retaining part, 13c, 14c...Center cable insertion hole,
15...Fixing tool, 15a, 15b...Forming part,
16...Clamp fitting retaining groove for single core, 17...Clamp fitting retaining groove for multi-core, 18...Fixing protrusion, 1
9...Connector.

Claims (1)

[Scope of utility model registration request] From the diameter of the hood consisting of the first and second forming portions with fixing protrusion support grooves of the fixing tool provided on the left and right hood walls of the cable pull-out opening, the tightening portions at both ends, and the tightening portion provided in the middle. It has a large retention part,
It has a clamp fitting with a cable insertion hole in the center, a half-insertion groove for a single-core cable clamp fitting on one side at the arrangement interval of the single-core cable, and a half-insertion groove for a multi-core cable clamp fitting on the other side. The single core to be fixed is provided with fixing protrusions inserted into the support grooves of the hood on the left and right sides, respectively, and first and second forming portions that are overlapped to form a fixing device of the clamp fitting. Alternatively, the clamp fitting fixed to the multi-core cable is sandwiched between the half-insertion grooves of the first and second fixing parts for single-core or multi-core cables, and the fixing protrusions are provided on the first and second forming parts of the hood. Cable fixing of an optical connector hood, characterized in that single-core and multi-core cables can be appropriately fixed by placing the first and second forming portions of the hood in the fixed protrusion support groove and overlapping and joining them. structure.