JPS6037812Y2 - Pressure contact - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a pressure contact that can be simultaneously assembled into a connector housing and requires less consumption of material for molding.

When connecting an electric wire to a contact used in a connector, an electric connection is obtained by press-fitting the electric wire into a slot provided at one end of the contact and pressing the conductor of the electric wire against the end surface of the slot, rather than soldering. There is a so-called insulation displacement type contact.

This pressure contact (hereinafter referred to as a contact) is made by molding a band-shaped elastic metal plate by continuous press working, and FIG. 1 shows an example of a conventional contact in an external view and a developed view before working.

The contact 1 shown in FIGS. 1a and 1b consists of two roughly parallel rectangular separating pieces 2 and 3 and a connecting piece 4 connecting the separating pieces, with a connecting part provided with a press-fitting slot 5. 6 forms one end of each separation piece 2, 3, and is bent at right angles at points e and f from the state shown in Figure 1. In this case, separation piece 2 is flat over its entire length, but the separation The piece 3 is biased so that the part from the part connected to the connecting piece 4 to the other end approaches the separating piece 2, and then bent slightly outward to form a protrusion 7, and a mating pin terminal ( (not shown).

Further, a lance 8 formed by cutting and bending is provided on the separation piece 2 and protrudes obliquely, and when the contact 1 is inserted into the contact hole of the connector housing (not shown), The part presses against the inner surface of the contact hole and acts to prevent the contact from being pulled out.

Next, the contact 9 shown in FIG. 1C is formed by bending the contact shown in the exploded view of FIG. A press-fitting slot 11 is formed at one end of 10, respectively.
connecting parts 12, 12', spring pieces 13° 13' extending upward from the other end of the base piece and biased toward each other, and the tips of the spring pieces and the connecting part 12.
, 12' and extending perpendicularly from the base piece 10.

The retaining pieces 14.14' each have a retaining protrusion 15.1 whose one end is separated by a notch and bent outward from each other.
5' is used, but this is contact 9 as in the previous example.
When inserted into the contact hole, it comes into pressure contact with the inner surface of the contact hole and acts to prevent the contact from being pulled out.

The contacts 1 and 9 described above are first continuously punched out from a long strip of material into the shapes of the developed views shown in Figures 1 and d, and then finished by bending, but these steps are usually carried out as shown in Figure 2. The material is advanced while being attached to a band-shaped carrier 16, which is a part of the material, and is separated from the carrier 16 in the final state to obtain a single completed contact product 17.

If the pitch B of each contact 17 on the carrier can be made equal to the arrangement pitch of the contact holes in the connector housing (not shown), then the contact assembly 17 can be attached to the carrier 16 as described above before being separated into individual parts. It is extremely efficient to use a connector assembly method in which the contacts and the carrier are separated after being inserted into the contact holes and fixed at the same time.

However, as shown in the molding process state of FIG. 2, the pitch B of the completed contact product 17 on the carrier 16 is approximately equal to the full width A of the contact 1 in the unfolded state (see FIG. 1);
In the contact having the shape shown in the figure, the parts constituting the contact are arranged side by side, so the total width A inevitably becomes large.

On the other hand, recent connectors have generally become smaller and the arrangement pitch of their contact holes has also become smaller, so it is difficult to make the pitch B of contacts with the structure shown in Figure 1 as small as the above arrangement pitch. Therefore, simultaneous integration of contacts into the housing is not possible.

Further, when punching out the shape of each development, a large amount of material is wasted due to cutting off, which is uneconomical.

Furthermore, in the contact 1 shown in FIG. 1a, since the contact portion with the mating pin terminal is mainly the single separation piece 3, contact failure may occur due to slight deformation, and the lance 8 for preventing removal may occur. Since it is cut and raised to a small size, it has little elasticity and may be permanently deformed when inserted into a contact hole, and may lose its locking force to prevent removal.

On the other hand, in the contact 9 shown in FIG. Since it is structured so that it bites into the inner wall surface of the contact when it is inserted, the inner wall surface may be damaged, and when the contact is replaced, the locking force of the newly inserted contact will be reduced.

The present invention was developed to solve the above-mentioned drawbacks, and its purpose is to allow the contacts to be assembled into the housing while still being attached to the carrier, and to reduce the amount of material cut off during pressing. To provide a pressure welding type contact having a structure that has sufficient contact force with a mating pin terminal, securely locks into a contact hole, and allows the contact to be replaced without damaging the inner wall surface of the contact hole. It's about doing.

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

The external appearance of the molded product of the pressure contact type contact (hereinafter referred to as the present contact) 20 according to the present invention is as shown in FIG. 1 is a developed view of this contact, showing the state when a band-shaped material is punched out with a press.

As shown in Fig. 4, this contact has a shape that extends almost on the same axis as a whole, and is made by folding it back at the middle part and bending it to form a parallel plate shape, so the overall width in the unfolded state is small. In addition, since the shape is point symmetrical about the center point C in the unfolded state, it is possible to arrange adjacent contacts closely together, and therefore, unlike the conventional example described above, the arrangement pitch can be made sufficiently small to accommodate the necessary connector The contact hole pitch can be made to match the pitch of the contact holes.

Since this contact has a symmetrical shape as described above, the reference numerals for each part mainly refer to one side, and for the other side, a '' is added to the above reference numerals to indicate that they have the same shape.

First, in FIG. 3, one end of the contact 20 has a pressure welding slot 22, 22' that is substantially parallel to each other, and an inverted V-shaped tapered portion 23, 2 that slopes outward from the open end of the slot.
The lower parts of the pressure contact parts 21, 21' are integrally continuous with holding parts 24, 24' which are also substantially parallel to each other.

The lower end of the holding part 24, 24' has two parallel connecting pieces 25.
．． They are integrally connected to each other by 25', and a rectangular terminal introduction port 26 is opened between each connecting piece.

There is a hinge part 27.27' extending slightly from one end surface of the upper part of the holding part 24.24' in a direction perpendicular to the axis of the holding part, and a hinge part 27.27' that extends perpendicularly to the plane of the holding part 24.24' continuously to the hinge part. Contact spring 28 extending in the direction of the blank connecting piece 25.25'
．． 28' is provided.

The contact springs 28, 28' have their faces facing each other and the tips 29.
29' are biased toward each other, and then further inward to form a protrusion having an arcuate cross section, and the tips 29 and 29' are slightly curved outward, so that they are connected to the mating pin terminal (not shown). The structure facilitates insertion and allows the protrusion to come into sufficient elastic contact with the pin terminal.

Approximately in the middle of the holding parts 24, 24', locking protrusions 30, 30' are formed by punching out from the surface of the holding part so as to project outward from each other.
The part on the pressure contact part 21, 21' side of 0' is stamped out in a step shape perpendicular to the axis of the holding part to form a locking step part 31.31', but the part on the connecting piece 25.25' side is not held. Part 24.24
It is formed so that it rises on a gentle slope from the surface of '.

Due to processing reasons, the width between the lower end of the pressure contact parts 21, 21' and the upper part of the holding part 24, 24' is slightly narrower, resulting in a stepped part 32.
, 32' are formed.

Next, in FIG. 4, each contact 20 is punched out from a band-shaped material, and the tip of the tapered part 23 of one press-contact part 21 is attached to a band-shaped carrier 33 by a pair of bridges 34, and each bridge 34 has a notch 35. is engraved.

Each contact 20 is first punched in close contact with each other, then cut along lines 1, 1' to separate it from the adjacent contact, and then the hinge parts 27, 27' and the retaining parts 24.2
At the line m9m', which is a continuous point with 4', the hinge part 27,
27' and the contact springs 28, 28' are bent at right angles in the same direction (on the side opposite to the protruding side of the locking protrusion 30, 30'), and further along the lines n, n' of the connecting piece 25, 25'. Holding part 2 such that the locking protrusions 30 and 30' face outward from each other.
4.24' are bent and formed approximately parallel.

However, in reality, they are not completely parallel, but are formed to be slightly wider so that the distance between the pressure contact portions 21, 21' is slightly larger than the distance between the holding portions 24, 24'.

The contact springs 28 and 28' are bent before or at the same time as the bending of each part.

All of the above-described molding of the contact 20, including the necessary plating process, is performed while it is integral with the carrier 33.

Next, FIG. 5 shows the procedure for mounting the contact 20 on the housing 40, in which the contact 20 is first inserted into the contact hole 4 of the housing 40 while being integrated with the carrier 33.
1, but the arrangement pitch of each contact is configured to match the pitch of the contact holes 41 of the housing, so each contact 40 has its axis aligned with the axis of each contact hole 41. You can leave it there.

On both sides of the contact hole 41 in the housing longitudinal direction,
Corresponding grooves 42, 43 and 42', 43' are cut on both end faces of the contact 20 to a position slightly above the center of the contact hole, and each contact 20 has its connection piece 25. 25' first, they are simultaneously inserted into the contact hole 41, and both end surfaces of the pressure contact parts 21, 21' fit into the grooves 42, 43, 42', 43', respectively, and move forward.

Then, the step portions 32, 32' formed at the lower ends of the pressure contact parts 21, 21' abut against the shoulders 44, 44', etc. formed at the lower ends of the grooves 42, 43, 42', 43'. Contact 20 is stopped.

In this state, the connecting pieces 25 and 25' at the lower end of the contact approach the bottom of the contact hole 41 to the extent that they are slightly apart from each other, and the terminal insertion opening 45 formed at the bottom of the contact hole 41
and the terminal introduction port 26 of the contact face each other at a position where their axes substantially coincide.

The longitudinal sides 46, 46' of the housing 40 are also provided with a locking window 47 and a locking slot 48, respectively.

When the contact 20 is inserted, the locking protrusion 30
．． 30' corresponds to the upper edge of the wall surface 49, 49' in the contact hole 41, and since the lower part of the locking protrusion forms a gentle slope, it can easily go over the upper edge.

Furthermore, as described above, the holding portions 24, 24' are formed in advance to expand slightly upward, but the effective length as a spring plate from the bent portion of the connecting piece 25, 25' to the locking protrusions 30, 30' is Since it is long, the holding parts 24° and 24' are easily deformed, and the locking protrusions 30 and 30', together with the effect of the above-mentioned gentle slope, can easily slide on the wall surface without fear of damaging the wall surface 49 and 49'. Move and move forward.

Then, at the position where the locking protrusions 30, 30' match the locking windows 47 and the locking slots 48, the holding portions 24.24' elastically return, and the locking step portions 31, 31 of the locking protrusions 30, 30', 3
1' and the upper edges of the locking window 47 and the locking slot 48 engage to prevent the contact 20 from being pulled out upward.

Since the holding portions 24, 24' are slightly expanded upward, their return elasticity is strong and the above-mentioned engagement can be carried out with sufficient certainty.

When removing the contact 20 for replacement or the like, push the locking protrusions 30, 30' inward from the outside of the locking window 47 and locking slot 48 using a suitable tool.
The engagement between the two can be easily removed, and the contact 20 can be removed from the contact hole 41.
Due to the springiness of ', the locking step portion 31.31' is not excessively pressed against the wall surface 49.49', and there is no risk of damaging the wall surface.

Each contact 20 is connected to a contact hole 41 in the housing 40.
Since the bridge 34 including the notch 35 and the carrier 33 are located above the uppermost end of the housing 40 when fully inserted, a force can be applied to the carrier 33 in a direction perpendicular to its extension direction. For example, the carrier 33 together with the bridge 34 can be easily bent from the notch 35 and separated from the contact.

Other details such as the detailed structure of the housing 40 and the method of connecting the electric wires to the contacts 20 will not be described.

As mentioned above, according to the present invention, since the contacts are extended on the same axis when punched from the material, the overall width in the unfolded state is small, and since they are arranged closely and continuously, the distance between the contacts can be reduced. The pitch can be molded to match the pitch of the contact holes in the housing, and therefore all contacts can be assembled into the housing at the same time after molding, which streamlines assembly.
In addition, since less material is thrown off during contact molding, it is extremely effective in reducing costs.

In addition, since the contact spring is composed of two pieces, contact with the mating terminal is reliable, and since the effective length of the spring plate of the contact holding part is long, the holding part is sufficiently deformed when the contact is inserted into or removed from the contact hole. However, the locking protrusion does not damage the wall surface of the contact hole, so there is no problem in replacing the contact, and it has many advantages such as reliable engagement of the contact with the contact hole.

It goes without saying that the structure of the present contact is not limited to the above-mentioned embodiments, and can be modified in many ways without departing from the spirit of the present invention.

[Brief explanation of the drawing]

Figure 1 shows an external view and a developed view of a conventional pressure contact.
Figure 2 is the same diagram showing the molding process of a conventional contact, Figure 3 is an external view of the contact according to the present invention, and Figure 4 is a diagram showing the state of the molding process of a conventional contact.
The figure is a developed view of the contact of FIG. 3, and FIG. 5 is a diagram showing the procedure for mounting the contact of the present invention in a connector housing. 1.9,20・・・pressure contact, 5,11
．． 22, 22'... Slot, 21, 21'.
... Pressure contact part, 24.24' ... Holding part,
25, 25'... Connection piece, 26... Terminal inlet, 28, 28'... Contact spring, 3G,
30'...Lock protrusion, 31°31'...
-Lock step.

Claims (1)

[Scope of utility model registration request] A press-contact type contact that can connect an electric wire by press-fitting the electric wire into a slot provided at the end, one end being connected by a pair of connecting pieces forming a mating terminal introduction port,
The other ends of a pair of holding parts that are substantially parallel to each other are provided with a pair of pressure contact parts provided with the slots, and a part of each holding part is symmetrically connected to the holding part through a hinge part with respect to the center line of the contact. a pair of contact springs facing each other at right angles to the surface of the terminal; a portion of each of the pair of holding parts protrudes outward; A pressure contact with a locking protrusion that forms a gentle slope in the direction of the inlet.