JPH0220772Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention provides a protection part by molding on the outer periphery of the insulated wire cores without changing the conductor spacing of multiple insulated wire cores arranged in parallel. The present invention relates to a cable support that can prevent damage to the insulator and conductor of an insulated wire core, disconnection, etc. due to external forces such as bending force and torsional force.

(Background Art) As a conventional signal transmission cable used for signal transmission between electronic devices and a method of connecting the cable and a connector, there is a cable as shown in FIG. 1, for example. The round cable 10 shown in FIG.
and a jacket 12 covering the outer periphery of the insulated wire core 11. The procedure for connecting the round cable 10 to the connector 20 is to first connect the cable 10 to the length required for connection between devices.
After peeling off a required length of the outer sheath 12 from the end to expose the insulated wire cores 11, the wire cores 11 are untwisted and each wire core 11 is arranged in a parallel state (flat state) at a predetermined interval. Furthermore, by joining and integrating the adjacent surfaces of a plurality of insulated wire cores 11 arranged in a flat state over a predetermined length from the tip by gluing or fusing by heating and pressurizing,
Flat cable part (hereinafter referred to as flat part) 1
form 3. The insulated wire core 11 constituting the lead-out portion 15 located between the flat portion 13 and the end portion 14 of the jacket 12 is in a non-bonded state. The connector 20 includes a base 21, a retainer 22 having a hole 24, and a plurality of bifurcated contacts 23 protruding and fixed on the base 21 at a predetermined interval (same as the interval between the conductors of each insulated wire core 11). It consists of a hole 24 and a protrusion 25 that engages with it. In addition to the above-mentioned twisted type cable 10, there is also one in which a wire core previously constructed as a flat cable is bent and its outer periphery is covered with an outer jacket.

In the above configuration, when connecting the cable 10 to the connector 20, the tip of the flat portion 13 is cut at right angles to the axial direction of the wire core 11, and then each insulated wire core 11 constituting the flat portion 13 is It is positioned so that it is seated on each corresponding bifurcated contact 23, and the hole 24 of the presser 22 is
The presser 22 is pressed onto the base 21 so that the protrusion 25 is inserted therein. This pressing breaks the insulation coating layer of the insulated wire core 11 that is pressed between the bifurcated blade portion of the contact 23 and the presser 22, and the electrical connection between the contact 23 and the conductor of the insulated wire core 11 is broken. can get. FIG. 2 shows a state in which electronic devices 1a and 1b are connected by a cable with a connector connected by the method shown in FIG. Reference numeral 2 denotes a male connector consisting of a large number of connection pins fixed on the devices 1a and 1b, and has a large number of insertion holes for connection formed in the connector 20 (the bottom part is connected to the conductor of the insulated wire core 11). (The female end of the bifurcated contact 23 is exposed)
The pins are inserted and fitted into each other to achieve electrical connection.

However, in the conventional method of connecting a cable and a connector, the flat portion 1 of the connector 20
3 depends solely on the clamping force between the bifurcated blade part of the contact 23 and the presser 22 and the clamping force between the base 21 and the presser 22. For example, the thickness of the flat part 13 depends on the base If the width of the space formed between the holding tools is even slightly smaller, the holding is performed by the contact 23 against the wire core 11.
It depends only on the locking force of the blade. In this state, even if the contact 23 pierces the wire core 11, it may not reach the conductor, and when an external force such as tension, bending force, or twisting force is applied to the cable 10, the contact 23 and the wire core 11 may not reach the conductor. There is a risk of disconnection of the conductor or tearing of the insulator at the connection point. In particular, since the flat portion 13 is easily deformed in a direction perpendicular to the flat surface,
The strength of the connection is relatively high against tension and bending forces applied in the same direction, but it is difficult to deform in a direction parallel to the flat surface, so the connection may become easily damaged. Further, since the unbonded wire core is exposed in the lead-out portion 15, there is a risk that it may get caught on the edge of the device and damage the insulator. The above-mentioned drawbacks are even more severe in cables of the type in which the above-described insulated wire core is previously constructed as a flat cable and then coated with an outer sheath. This is because the insulated wire cores are joined and integrated over the entire length (there are no unjoined parts such as the lead-out part 15), so the stiffness of the flat part becomes large and is concentrated at the connection part with the contact. This is because the stress that occurs increases. In addition, disconnection due to bending is likely to occur in portions other than the connection portions with the contacts.

In order to prevent the above-mentioned damage to the wire core and disconnection of the conductor, a cover 3 made of plastic or the like is attached from one end of the connector 20 to the end of the jacket 12 of the cable 10, as shown in FIG. Exists. However, this cover is bonded to the connector 20 with adhesive and at the same time is connected to the cable 10 by the band 4, and is not connected to the insulated wire core 11, so it is subject to tension and bending. Not only is it not possible to effectively prevent wire breakage due to external forces such as force, but also the cover installation increases costs due to increased man-hours and the number of parts. Note that if the cover 3 is replaced with a molded body, the spacing between the conductors in the flat portion may vary due to shrinkage during molding, which may impede proper electrical connection with the connector 20.

(Purpose and structure of the invention) The present invention has been made in view of the above, and is designed to prevent damage to the insulated wire core at the connection between the connector and the insulated wire core due to external forces such as tension, bending force, and twisting force applied to the cable. In order to prevent disconnection and damage to the insulated wire core exposed from the cable sheath by installing a molded body, the insulated wire taken out from the end of the cable sheath is used to prevent fluctuations in conductor spacing due to shrinkage during molding. In a cable supporter provided by integral molding on the outer periphery of the core and on the outer periphery of a flat part in which the insulated wire cores are joined in parallel to each other, the cable supporter is provided on the outer periphery of the end portion of the cable jacket. a first protection part, a second protection part provided on the outer periphery of the insulated wire core taken out from the end of the cable jacket, and a third protection part provided on the outer periphery of the flat part. The first to third protection parts are constituted by a lower press molding part and an upper press molding part formed by a two-step integral molding operation, and the third protection part is formed of the flat molding part. The present invention provides a cable supporter having a contact portion that contacts the contact portion, and a non-contact portion having an area approximately half of the area of the contact portion.

(Example) The cable supporter of the present invention will be described below.

FIGS. 4A and 4B show a first embodiment of the cable supporter of the present invention. The same parts as in FIG.
This differs from the one shown in FIG. 1 in that a cable supporter 30 is attached from the outer sheath 12 to the flat portion 13, and the cable supporter 30 itself is engaged and locked with the equipment case 40. The cable supporter 30 is attached to the end 14 of the cable jacket 12.
The cable holding part 31 is integrated by molding from the outer periphery to the outer periphery of the flat part 13 and covers the outer periphery of the end part 14 of the jacket, and the outer periphery of the wire core pull-out part 15 where the insulated wire cores 11 are not joined together is covered. It is integrally formed of a wire core holding part 32 to be protected, a flat part protecting part 33 that is integrally covered with the outer periphery of the flat part 13, and a locking part 34 that is locked to the equipment case 40. As the material for the cable supporter 30, for example, a plastic material having a higher tensile strength, less elongation, and greater hardness than the insulating material used for the insulated wire core 11 is used. The cable holding portion 31 is integrally coated on the jacket end 14 and is attached to the end 1
External force (tension,
This prevents each wire core from misaligning due to bending force, etc.). The wire core holding part 32 is attached to the jacket end part 14
It binds and holds the extended wire core pull-out part and at the same time prevents damage to the equipment due to edges. The flat portion protection portion 33 is integrally coated with the outer periphery of the flat portion located on the outside of the device case 40.
A large diameter portion 35 and a small diameter portion 36 for relaxing and absorbing tension, bending force, twisting force, etc. applied to the small diameter portion 3.
The hole 37 is formed by punching into the flat portion 6 and exposes the outer circumferential surface of the flat portion 13. Locking part 34
has a fitting groove 38 into which the edge of the mounting hole 40a of the case 40 fits, and the cable supporter 30 is locked and fixed in the mounting hole 40a by the convex portions 39 at both ends of the fitting groove 38. The case 40 is fixed to the main body of the electronic device, and a plurality of male pins (not shown) are implanted into a printed circuit board 50 fixed inside the case 40, or a connector (not shown) is fixed thereto.
The free end of the flat portion 13 protrudes inside the case 40, and the connector 2 shown in FIG.
0 is fixed connection. The connector 20 is connected to the male pin implanted on the printed circuit board 50 or the connector (not shown) to realize electrical connection. When molding the cable supporter 30 having the above configuration, the wire core 1 constituting the flat portion 13
In order to prevent conductor spacing from changing due to distortion caused by heat shrinkage during molding, molding is performed in two steps: bottom pressing and top pressing, each with a mold thickness that is the same as the outer diameter of the wire core. (Thus, the total mold thickness is twice the core outer diameter.) Also, for the same reason, the area ratio of the contact area with the flat part 13 in the protection part 33 and the non-contact area (the hole 37 part) is set to 2:1. And so.

In the above configuration, even if an external force such as tension or bending force is applied to the cable 10, the external force is absorbed and alleviated by the cable holding part 31, the core holding part 32, the protection part 33, and the locking part 34. Insulated wire core 13
This prevents wire breakage, etc. Furthermore, damage to the insulator due to edges of the equipment case is also prevented. Small diameter portion 36 of flat portion protection portion 33, hole 3
7 serves to reduce the volume of the molding material, and a cable supporter 30 is provided around the outer periphery of the flat part 13.
When molding, the large diameter portion 35,
The presence of the small diameter portion 36 and the hole 37 is effective for improving the flow of the molding resin.

That is, the uneven portions of the mold improve the fluidity of the resin and spread the resin to every corner of the mold.

The connecting part between the flat part 13 in the device case 40 and the connector 20 is connected to the connector 20 by the external force, since the locking part 34 engaged and locked in the mounting hole 40a of the case 40 absorbs and relieves the external force applied to the cable 10. There is no danger of it being destroyed. Therefore, the connection reliability of the connector portion is increased, and at the same time, damage to the male pins or connectors on the printed circuit board 50 is also prevented. Further, the large diameter portion 35 and small diameter portion 36 of the flat portion protection portion 33 effectively prevent damage to the flat portion 13 due to bending or twisting of the cable.

In addition, since the molding of the cable supporter 30 is performed in two steps: downward press molding and upward press molding,
It is possible to avoid applying a total amount of contraction to the insulated wire core 11 at once, and it is possible to effectively prevent variations in the conductor spacing of the wire core 11. In addition, since the area ratio of the portion of the protective portion 33 that contacts the flat portion 13 and the portion that does not contact (the hole 37) is set to 2:1, the fluidity of the supporter molding resin during down-press molding is reduced, and the protective portion 3
Shrinkage deformation of the flat portion can be reduced without weakening the bonding force between the flat portion 3 and the flat portion 13.

A specific example of the first example is shown below.

(Example) The diameter of the insulated wire core 11 is 1.05φ, and the spacing between the conductors of each wire core 11 constituting the flat portion 13 is 1.27±.
The width of the flat part 13 is 0.05 mm, the thickness of the flat part 13 is 0.9 to 0.95 mm, and the number of wire cores is 34.
It was set to 43.2±0.2mm. The dimensions of each part are determined by the specifications of the connector 20 attached to the flat part 13, and the dimensions of each part and their tolerances do not change except for the width of the flat part which varies depending on the increase or decrease in the number of wire cores.

When molding the cable supporter 30 from the flat part 13 having the above-mentioned dimensions to the outer sheath 12, the molding process is performed in two steps: bottom press molding and top press molding.
I divided it into steps. That is, first, in the downward press molding, 1/2 of the wall thickness of each part of the cable supporter 30 is
The amount of resin is molded and integrated on the flat part 13, and then the remaining thickness (1/2) is
The resin was laminated and molded on the bottom press molded resin. In addition,
At this time, the ratio of the contact area to the non-contact area of the protection part 33 with respect to the flat part 13 was 2:1. As a result, deformation of the flat portion 13 due to shrinkage of the molded body could be effectively suppressed.

(Comparative Example 1) A cable supporter having the same wall thickness as in Example 1 was integrally formed with the flat portion 13 having the dimensions of Example 1 by one molding process. The ratio of the contact area to the non-contact area of the protection part 33 with respect to the flat part 13 was 2:1.

Each conductor of each insulated wire core 11 constituting the flat portion 13 was displaced due to shrinkage of the molded body, and the distance between each conductor no longer satisfied 1.27±0.05 mm. For this reason, it became difficult to connect each conductor of each wire core 11 onto each contact 23 on the connector base 21, and it became impossible to obtain a complete electrical connection by press-fitting and clamping with the presser 22. At the same time, adjacent conductors were short-circuited via the contact 23.

(Comparative Example 2) Flat portion 13 of protection portion 33 in Example 1
If the non-contact area of the cable supporter 30 is made larger than 1/2 of the contact area, that is, if the area of the hole 37 is increased, the fluidity of the cable supporter molding resin during down-press molding will decrease and the cable supporter 30 This resulted in poor molding, deformation of the waveform of the flat portion 13, and weakening of the bonding force between the protective portion 33 and the flat portion 13.

Next, FIG. 5 shows a second embodiment of the present invention,
A cable 10 includes a plurality of twisted insulated wire cores 1.
1, a conductive shield layer 16 that covers the outer periphery of the insulated wire core 11, an outer sheath 12 that covers the outer periphery of the shield layer 16, and a shield layer 16 inserted into the outer layer of the insulated wire core 11 group in the longitudinal direction. The drain wire 17 is in contact with the drain wire 17. The drain wire 17 is a conductor having the same diameter as the insulated wire core 11, and the outer periphery of the conductor is coated with conductive plastic having the same thickness as the insulator of the wire core 11. After peeling off the jacket 12 to a required length from the end of the cable 10 to expose the wire core 11 and the drain wire 17, the cable is untwisted and the drain wire 1 is untwisted.
7 is placed at one end, pressure and heating are performed to form a flat portion 13. Reference numeral 60 indicates a shield cover for noise shielding (electrically connected to the shield layer 16), and the pair of shield covers 60 is made of, for example, a thin conductive foil (for example, a foil made of copper or aluminum) having a large number of holes 61. ) is molded to match the external shape from the flat part 13 to the outer cover end 14, and the flat part 1
3 to the jacket end 14 from the top and bottom, and is fixed onto the cable and flat part by wrapping a thin adhesive tape around the outer periphery (so as not to block the hole 61). . The cable supporter 30 is integrally formed on the outer periphery of the shield cover 60, which is fixed and has no fear of falling off, by molding in one step or the two steps described above. The molded resin is molded into the small hole 61 of the shield cover 60.
Flows into the shield cover 60 from the wire core 13,
The shield body 16 and the outer cover 12 are integrated. Also,
Connect the drain wire 17 to contact 2 of the connector 20.
When grounding with 3 (grounding inside the device),
The drain wire 17 is integrated with the wire core 11 as in the embodiment shown in FIG. heart 11
Only the shield cover and the shield cover are molded. The drain wire 17 is grounded to the equipment. In addition to the above-mentioned conductive foil molded into a predetermined shape, the shield cover can also be used by winding a thin conductive foil tape (made of copper, aluminum, conductive plastic, etc.) with many small holes. You may also do so. According to this embodiment, even if the molded body contracts, the shrinkage of the wire core 11 is alleviated by the presence of the shield covers 60 and 61.

FIG. 6 shows a third embodiment of the present invention, which is different from the second embodiment shown in FIG. 5 in that the shield cover 60 is molded with conductive plastic resin. are different.

In both of the embodiments shown in FIGS. 5 and 6, the shield cover 60 covers the area from the flat part 13 to the shield layer 16, thereby shielding noise from coming in and out, and at the same time preventing heat from the flat part during molding. The effect of preventing shrinkage and deformation can be enhanced. That is, during downward press molding, the flat part 13 and the drawer part 1 are removed from the small hole 61 of the shield cover 60.
5. Since the molded resin filled on the shield body 16 and the outer cover 12 is only 1/2 of the total filling amount, the influence on the flat portion 13 is small. Therefore, almost no deformation of the flat 13 occurs. Shield cover 6 molded from conductive plastic resin
The thickness of 0 is the abbreviation of the thickness of the flat portion 13.
1.5 times is optimal.

When the cable supporter 30 does not come into contact with the human body, the drain wire and shield cover can be made unnecessary by integrally forming the supporter 30 itself from conductive plastic and grounding the supporter 30 to the equipment case.

(Effects of the invention) As explained above, according to the cable supporter of the invention, the outer periphery of the insulated wire core taken out from the end of the cable jacket and the insulated wire core are joined and integrated in parallel to each other. In the cable supporter provided by integral molding on the outer periphery of the flat part, a first protection part provided on the outer periphery of the end of the cable sheath, and a first protection part taken out from the end of the cable sheath. It has a second protection part provided on the outer periphery of the insulated wire core and a third protection part provided on the outer periphery of the flat part, and the first to third protection parts are integrally molded in two steps. The third protection part is composed of a lower press-molded part and an upper press-molded part formed by the work, and the third protection part has a contact part that contacts the flat part and an area of approximately 1/1 of the area of this contact part. The non-contact area has a non-contact area with an area of In preventing damage to the exposed insulated wire core by providing a molded body, it is possible to prevent variations in conductor spacing due to shrinkage during molding.

[Brief explanation of the drawing]

Figures 1, 2 and 3 are explanatory diagrams of the configuration of conventional signal input/output cables and connectors, and Figures 4A and 4B are side and front views of the first embodiment of the cable supporter of the present invention. , FIG. 5 is an explanatory diagram of the configuration of the second embodiment of the cable supporter of the present invention, and FIG.
Figures A and B are a front view and a side view of a third embodiment of the cable supporter of the present invention. Explanation of symbols, 1a, 1b...Electronic equipment, 2...
Male connector, 3...cover, 4...band,
10...Round cable, 11...Insulated wire core, 12
...Sheath, 13...Flat cable part, 14...
... Sheath end, 15 ... Wire core pull-out part, 16 ... Shield layer, 17 ... Drain wire, 20 ... Connector, 21 ... Base, 22 ... Holder, 23 ...
...Two-pronged contact.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Integrally molded on the outer periphery of the insulated wire core taken out from the end of the cable jacket, and on the outer periphery of the flat part where the insulated wire cores are cut in parallel and joined together. In the cable supporter thus provided, a first protection portion provided on the outer periphery of the end portion of the cable jacket, and a first protection portion provided on the outer periphery of the insulated wire core taken out from the end portion of the cable jacket. and a third protection part provided on the outer periphery of the flat part, and the first to third protection parts are formed by a two-step integral molding operation. The third protection part includes a contact part that contacts the flat part, and an area of approximately 1/2 of the area of this contact part.
A cable supporter characterized by having a non-contact portion with an area of . (2) The cable supporter according to claim 1, wherein the third protection part includes a metal shielding foil that suppresses variations in the conductor spacing of the insulated wire core of the flat part. (3) The cable supporter according to claim 1, wherein the first to third protection parts are made of conductive plastic resin.