JPH0449826Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pressure welding connector, and particularly to an effective holding structure for wires connected to a small pressure welding connector.

(Prior Art and its Problems) In recent years, due to the simplification of connection of connection wires to connector contacts, the use of so-called insulation displacement connectors, which can be connected without soldering, and the use of flat cables as connection wires have become popular. For example, as shown in Figure 1a, this connector has a slit 1a provided in the center.
FIG. 2a shows a pressure welding connector 1 equipped with a contact tail 1c having oblique blades 1b that descend outward on the left and right sides.
The required number of poles are fixed to the first insulating block 2 in a row as shown in FIG. The second insulating block 3 for fixing the flat cable 4 has an insertion hole 3b. Then, as shown by the dotted line in FIG.
After fixing, the first insulating block 2 is placed on top of the first insulating block 2, and each tail 1c of each insulation displacement contact 1 is fixed.
By inserting the diagonal blade 1b into the sheath 4a of the flat cable 4 while inserting it into the insertion hole 3b,
As shown in FIG. 1b, a cut is made in the coating 4a, and the core wire 4b of the cable is press-fitted into the slit 1a to connect the core wire 4b and the contact 1. By inserting the contacts into the contacts of a mating connector (not shown), the circuits connected to each connector are connected to each other. However, in recent years, with the development of integrated circuits and other technologies, various types of light electrical equipment have become smaller, and along with this, the wiring space between equipment components has been reduced, so connectors have become smaller and the pressure contact 1 As the arrangement pitch becomes smaller, the spacing between the core wires of the flat cables connected thereto also inevitably becomes smaller. For this reason, it is difficult to fix the core wires with the coating with an accurate pitch.
As shown in FIG. c, the contact 1 also comes into contact with an adjacent core wire 4b' other than its own connecting core wire, causing a short-circuit accident.

Therefore, recently, when the contact pitch becomes smaller than a certain degree, thin single-core wires, so-called discrete wires, are used instead of flat cables. For example, Figure 2b
As shown in the figure, the wire 6 to be connected is press-fitted into the fixing groove 5 provided in the second insulating block 3 and has a width smaller than the outer diameter of the wire 6, and the first insulating block 2 with the contact 1 fixed thereon is fixed. A method of connecting as shown in FIG. 3 is used by fitting the contact tail 1c into the insertion hole 3b and pressing down.

However, this increases the chances of connection failures due to reasons explained below, and it has been pointed out that it is necessary to eliminate this drawback in order to miniaturize the connector. That is, commonly used wires are highly flexible because they use twisted wires as core wires. Insulating blocks are also generally made of synthetic resin material in most cases. Therefore, it is difficult to manufacture the escape hole 3b of the contact tail 1c without creating a gap between it and the contact tail 1c, and the cross section inevitably becomes larger than the cross section of the contact tail. Thus, the length of the core wire in the extending direction is such that the thin wire 6 can be inserted in the folded state. Furthermore, if only the wire is press-fitted into the fixing groove 5, the contact 1
Due to the downward force applied to the wire crossing the escape hole 3b, the tip of a wire whose length from the escape hole 3b is short tends to move toward the escape hole 3b side. For this reason, when connected, a part of the wire eye 6 is folded in two as shown in Fig. 4, sinks into the insertion hole 3b, and escapes below the tail 1c of the pressure contact, which prevents the diagonal blade 1b from cutting into the coating. It will no longer be done. Moreover, even if this is done, it will be insufficient and the core wire will not enter the slit 1a, increasing the chances that the connection between the core wire and the contact will be disturbed. Moreover, as connectors become smaller, the length A from the escape hole 3b to the front end of the second insulating block 3 (see Fig. 4) becomes shorter, and the length of the wire 6 in this area becomes shorter. As the length becomes shorter, the holding force of the wire 6 due to press-fitting becomes smaller, and therefore the chance of connection failure increases. Furthermore, in connection, a large number of wires 6 must be press-fitted into each narrow fixing groove 5. The work of fixing the wire 6 requires more time than the work of pressure connection using contacts.
Furthermore, since the wire 6 is not fixed sufficiently by press-fitting, the wire 6 is likely to move or fall out due to external force. Therefore, it is difficult to adopt a manufacturing method in which the connector with the wire 6 fixed in the fixing process is sent to the connection process for connection, so the connector with the wire fixed therein can be pressure-welded immediately on the spot without having to be transported to another process site. There is a manufacturing disadvantage in that connections with contacts must be made.

(Purpose of the invention) The present invention provides a pressure welding connector that eliminates the various drawbacks mentioned above, such as poor connection, and enables the connector to be made more compact than the current size.

(Means of the present invention for solving problems) The features of the present invention are as follows. That is, as shown in the partial cross-sectional view of one embodiment shown in FIG. 5a,
The second insulating block 3 of FIG. 2 is divided into an upper insulating block 7 and a lower insulating block 8. The lower insulating block 8 has a wire positioning groove formed by a narrow entrance part 8a into which the wire 6 is inserted by press-fitting, and a lower wide part 8b made equal to or slightly smaller than the outer diameter of the wire 6 to form a joint key part 8c. 8d
are provided to match the installation pitch of the contacts, and an escape hole 8e for the contact tail 1c passing through the lower insulating block 8 is provided. On the other hand, the upper insulating block 7 has a fixed protrusion 7d, that is, a wide part 7a at the tip.
It has a connecting key part 7c that protrudes from the width clamp part 7b at its base, and when it is press-fitted into the wire positioning groove 8d of the lower insulating block 8 as shown in FIG. 5b, the connecting key part 7c is attached to the lower part. While the wire 6 is held in the connecting key part 8c of the insulating block 8, the wire 6 placed in the positioning groove 8d is inserted into the positioning groove 8d.
A fixing protrusion 7d of a length that can be pressed between the bottom surface and the wide portion 7a of the distal end surface is provided corresponding to the pitch and number of the positioning grooves 8d. Further, an insertion hole 7e for the contact tail 1c passing through the upper insulating block 8 is provided at the base of the fixed protrusion 7d. Note that 7f and 8f are guide slopes.

Then, by overlapping the upper insulating block 7 with the lower insulating block 8 and pushing it in as shown in FIG.
After fixing, as shown in FIG. 5c, by aligning and pushing the tail 1c of the pressure contact 1 fixed to the first insulating block 2 (see FIG. 1) into the insertion hole 7e of the upper insulating block 7, A notch is made in the coating 6b of the wire 6 by the oblique blade 1b of the contact, and the core wire 6a is press-fitted into the slit 1a for connection.

(Effects of the invention) According to the invention, the wire can be forcibly held in the positioning groove 8d with a strong force if the escape hole 8d is made large enough to allow the wire to fall into it due to manufacturing constraints. Even if the tail 1c of the insulation displacement contact is pushed in, this will cause the wire 6 to
can be reliably prevented from sinking into the escape hole 8e. Therefore, it is possible to prevent frequent connection failures between wires and contacts due to sinking as in the prior art, and it is also easier to manufacture an insulating block including escape holes 8e, contributing to further miniaturization of the connector.

In addition, in the conventional connector, as described above in Fig. 2, it is necessary to push each thin wire 6 into the narrow fixing groove 5 and fix the wire, which leads to the miniaturization of the connector. The process becomes troublesome. However, in the present invention, the wire 6 placed at the entrance 8a of the wire press-fitting groove 8d of the lower insulating block 8 can be pushed into the positioning groove 8d all at once by the fixing protrusion 7d of the upper insulating block 7 and fixed. becomes significantly easier. Moreover, since the fixing is performed reliably, even if the insulating block to which the wire is fixed is sent to the connection process with the pressure contact, there is no risk of the wire coming off as in the conventional case.
Therefore, it is advantageous to separate the pressure welding process and the fixing process, which takes a longer time than the pressure welding process, and to assign many workers to the fixing process to manufacture the product in an assembly line.

(Means for Enhancing the Effects of the Present Invention) The present invention has been described above, but by adding a wire fixing and reinforcing means as described below,
Connection failures due to the wire 6 sinking into the escape hole 8e can be more reliably prevented. 6a, b, and c are provided with retaining steps 8g and 7g in the wire positioning groove 8d and the fixed protrusion 7d, respectively, and are held so that they are bent at the stepped portions pressed by the fixed protrusion 7d. This is an example of further strengthening. In addition, in the one shown in FIG. 7, a wire retaining protrusion 8h is provided on the bottom surface of the positioning groove 8d, and when the wire is fixed, the protrusion 8h bites into the wire coating 6b to ensure secure retention. The protrusion may be provided on the distal end surface or both sides of the fixed protrusion 7d. In addition, in the one shown in FIG. 8, the wire fits into the positioning groove 8d and the wire fixing protrusion 7d, which have the same width in the depth direction and the height direction, and into the connecting key part 8c, which has a rectangular recess on the intermediate surface. A connecting key part 7c having a rectangular convex part is provided to ensure the connection between the upper and lower insulating blocks 7, 8, and when the height of the convex part is increased, a slit is provided in the fixing protrusion 7d. 7i must be provided. Note that the fixing protrusion 7d of the structure explained in FIG. 5 may also be provided with a slit 7i, as shown by the dotted line in the figure, to facilitate press-fitting.

[Brief explanation of the drawing]

Figures 1, 2, 3, and 4 are explanatory diagrams of the conventional connection structure, Figure 5 is an explanatory diagram of the holding structure of the present invention, and Figures 6, 7, and 8 are explanatory diagrams of the present invention. It is an explanatory view of a modification of . 1... Pressure contact, 1a... Slit, 1b...
Slanted blade, 1c... Contact tail, 2... First insulating block, 3... Second insulating block, 3a... Lock key, 3b... Pressure contact insertion hole, 4... Flat cable, 4a... Sheath, 4b... Core wire, 5 ... wire fixing hole, 6 ... wire, 6a ... core wire, 6b ... coating, 7 ... upper insulating block, 7a ... wide part, 7b
...Narrow width part, 7c...Joining key part, 7d...Fixing protrusion, 7
e... Contact insertion hole, 7f... Guide slope, 7g
Retaining stepped part, 7i...Slit, 8...Lower insulating block, 8a...Wire entrance part, 8b...Wide part, 8c
...Joining key part, 8d...Wire positioning groove, 8e...Contact tail relief hole, 8f...Guiding slope, 8g...
Retaining stepped portion, 8h...retaining protrusion.

Claims (1)

[Claims for Utility Model Registration] A first insulating block having a pressure contact fixed thereon and a second insulating block positioning a wire is provided, and by overlapping the first insulating block and the second insulating block, the first insulating block In a pressure contact connector in which a wire is press-fitted into a slit of a pressure contact in an insulation block to connect the wire and the pressure contact, the second insulation block is divided into an upper insulation block and a lower insulation block, and the second insulation block is divided into an upper insulation block and a lower insulation block. The lower insulating block is provided with wire positioning grooves having connecting key portions on the left and right sides of the entrance, and the upper insulating block has connecting key portions on the left and right sides of the tip that are locked by the connecting key portions of the lower insulating block. The wire inserted into the wire positioning groove is provided with a fixing protrusion that is clamped and fixed between the bottom surface of the positioning groove, and by overlapping the upper insulating block and the lower insulating block, the wire can be fixed. The first part is fixedly held and is provided with pressure contacts on the overlapping upper and lower insulating blocks.
A pressure welding connector characterized in that a wire and a pressure contact are connected by overlapping insulating blocks.