JPH0321008Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a connector for electrically connecting devices, and in particular to a connector for flat cables in which a large number of core wires are arranged in parallel. It is.

As the amount of signals increases, it becomes necessary to connect devices with a large number of wires, and in order to reduce the number of man-hours required to connect connector terminals and cable core wires and to make the cable more compact, strip-shaped cables with a large number of core wires arranged in parallel are used. A method has been adopted in which two flat cables are crimped onto a large number of terminal pins provided on a connector and connected at the same time.

After the connector to which the cable core wire is connected in this manner is connected to another connector fixed to the device side, etc., the connectors are locked to prevent them from coming apart due to mishandling or the like. A common method for this locking is to engage a hook provided on the connector on the device side with a hook provided on the connector on the cable side, thereby fixing both connectors.

However, with this locking method, due to errors in the mounting dimensions of the hook and the dimensions of the hook part of the connector, it is too hard to secure when engaged, and conversely, it is too loose and may come off, so improvements are desired. ing.

[Conventional technology]

Fig. 4 is a diagram for explaining the structure of a conventional connector to which a flat cable is connected, in which a flat cable 4 is sandwiched and crimped between a molded part 2 and another molded part 3, and the flat cable is The insulating material 42 covering the core wire 41 of the cable connector 1 is pressed against a terminal (not shown) buried in the molded part 2 and peeled off, and the core wire 41 is caulked to the terminal and electrically connected to the cable connector 1. is completed. Note that concave hook portions 31 are provided at both ends of the molded component 3.

FIG. 5 is a diagram for explaining the locking mechanism of the connector on the device side to which the connector is attached. The connector 5 has a hook 7 that is swingably connected with the pin 6 as a viewpoint, and the hook 7 is opposite to the pin 6. A protrusion 71 is provided on the inside of the side.

When both connectors 1 and 5 are locked, cable connector 1 to which flat cable 4 is connected is attached to connector 5, and cable connector 1
The hook 7 of the connector 5 on the device side engages with the recessed hook 31 of the molded part 3, thereby preventing the two connectors from coming off.

[Problem that the invention attempts to solve]

For the above conventional cable connector, 2
Two molded parts are produced separately, and the part to which the hook 7 of the connector 5 on the device side engages is also constructed by combining the separate parts.

In general, molded parts of connectors are molded parts of thermoplastic resin, so they shrink after being molded and have different dimensions from the mold. This shrinkage rate is determined for each material, and when multiple parts of the same shape are molded using the same material and under the same conditions, each part will shrink in the same way in proportion to its size, producing the same parts without variation. can do. However, the fine components of the material and molding conditions, ie, mold temperature, pressure, injection time, cooling time, etc., inevitably vary from mold to mold due to the precision of the manufacturing equipment, the influence of the external environment, etc.

Therefore, there will be variations in the finished molded products, and the error in the dimension (A+B) of the part hooked to the hook 7, which is made up of two parts, will be due to the variation in the dimensions of the molded parts 2 that are molded separately. It is the sum of ΔA and the dimensional variation ΔB of the molded parts 3, and the engagement may be hard or loose.

Note that the total error is simply the sum of the errors of the two molded parts, but this is the case where each variation is at its maximum, and when it is made up of as few as two parts, the maximum This is because there is a high possibility that the variations will overlap.

[Means for solving problems]

The present invention provides a cable connector that eliminates the above-mentioned problems and does not require high manufacturing precision. This connector is made by press-welding a flat cable to be connected to the terminals of two molded parts, and attaches a mating connector to the mating connector. The other molded part has an upwardly extending protrusion having a hook at its tip that is engaged by a hook, and the other molded part has a concave part above both ends thereof, and the other molded part has a concave part extending downward from the concave part and is engaged with the protrusion. , and a substantially U-shaped lock portion whose lower end surface is located above the bottom surface of the molded component in the engaged state.

[Effect]

In the above cable connector, the hook part of the cable connector that is hooked to the hook of the mating connector is a protrusion 82 provided on one molded part.
Since the two molded parts are made of only one molded part, it is only necessary to consider the manufacturing accuracy of one of the molded parts when engaging, and the accuracy of the other molded part is not required. Therefore,
Dimensional variations in the finished product of the cable connector are due to differences in molding conditions for only one molded part, that is, one time, and the width of the variation is reduced, making it easy to engage the connector and preventing it from coming off.

As mentioned earlier, such dimensional variations in molded parts are caused by variations in molding conditions such as mold temperature, pressure, injection time, cooling time, etc., and range from a few mm to more than 10 mm. In the case of a part, variations in conditions during one molding process will cause variations in the same precision, regardless of the size.

For example, the German molded product dimensional tolerance standard listed in section 179 of "Design of plastic molded products" published by the Nikkan Kogyo Shimbun states that the tolerances are the same within a certain range of small dimensions, but such plastic molded products It is determined by considering the characteristics of

Therefore, even if the overall size is the same, if it is made up of two molded parts and molded twice, variations in the molding conditions of the two times will have an effect, and one molded part will be If the molding is completed in one step, there will be less variation in the dimensions.

In the problem section above, we considered the variation in the case of two parts as a simple sum of the variations in each part, but even if we consider it as the so-called root mean square error, the degree of effect will be smaller. , the variation in the present invention is naturally reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are perspective views of essential parts showing the structure of a flat cable connector according to an embodiment of the present invention. Figure 1 shows the terminal side parts, molded parts 8
A hook portion 81 to be engaged with the hook 7 of the device side connector 5 is integrally formed on the hook portion 8.
A protrusion 82 is provided below 1.

Figure 2 shows the other part that clamps the flat cable together with the terminal side mold 8. Recesses 91 are formed at both ends of the mold part 9, but these recesses 91 are similar to the recesses of conventional connectors. Rather than being directly hooked to the hook 7, it serves as an escape when the hook 7 hooks the hook 81 of the terminal side molded component 8. Further, on the opposite side of the recess 91, a substantially U-shaped lock portion 92 is provided.

FIG. 3 is a diagram showing the state when the flat cable 4 is connected.
2 and the lock portion 92 of the molded part 9 fit together to fix the flat cable 4. In this case, the lower end surface of the lock portion 92 of the molded component 9 is located above the bottom surface of the molded component 8.

Connect this cable connector to connector 5 on the device side.
(See FIG. 5), only the variation ΔD in the dimension D becomes the variation in engagement with the hook 7.

[Effect of idea]

As explained above, according to the present invention, when the hooks for fixing the connectors are engaged, the workability is good and detachment can be prevented. Also, there is an effect that the manufacturing precision of molded parts can be made more loosely than in the past.

[Brief explanation of drawings]

1 and 2 are perspective views of essential parts showing the configuration of a flat cable connector according to an embodiment of the present invention, and FIG. 3 is a diagram showing the connector of the present invention to which a flat cable is connected. FIG. 4 is a diagram for explaining the structure of a conventional connector to which a flat cable is connected, and FIG. 5 is a diagram for explaining the locking mechanism of the connector on the device side. In the figure, 1 is a cable connector, 2, 3,
8 and 9 are molded parts, 4 is a flat cable,
5 is the device side (mate) connector, 7 is the hook, 3
1 and 81 are hook parts, 41 is a core wire, 42 is an insulator, 71 and 82 are protrusions, 91 is a recess, and 92 is a lock part.

Claims (1)

[Claims for Utility Model Registration] It has two molded parts 8 and 9 made of insulators, and a flat cable connected to a plurality of terminals provided on one of the molded parts is interposed and pressure-welded between both molded parts. This is a connector to which a mating connector is attached, in which one molded part 8 is provided with a hook part 81 at the tip thereof, which is engaged by a hook of the mating connector when it is attached to the mating connector on both side walls. The other molded part 9 has a projection 82 extending upward, and has a recess 91 above both ends thereof, and a projection 8 extending downward from the recess 91.
2, and a substantially U-shaped lock portion 92 whose lower end surface is located above the bottom surface of the molded part 8 in the engaged state.