JPS6333490Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wire-to-board connector, and an object of the present invention is to provide a connector that can connect and disconnect an electric wire and a printed circuit board reliably and with good workability.

As a conventional wire-to-board connector, there is one shown in FIG. 1, for example. In the figure, 1 is a printed circuit board with a print (not shown) applied to its lower surface. The connector 2 is formed by assembling a resin mold 3 and metal contact pins 4. One through-mounting hole 5 provided in the vertical direction in the figure of the mold 3 is provided with an inclined stepped portion 5a on the left inner side and a slotted hole 5b on the right side. The contact pin 4 has a terminal portion 4a at the lower end of a band-shaped metal plate, a cut-and-raised portion 4c on an intermediate plate portion 4b, and an upper plate portion 4d and an upper plate portion 4d by bending the upper end into a substantially U-shape. A dial plate part 4e is formed, a circular hole 4f is provided in the upper plate part 4d, and a convex part 4g is provided in the upper plate part 4e, the tip of which is spaced apart from the intermediate plate part 4b. The contact pin 4 connects the cut-and-raised portion 4c from below the hole 5 of the mold 3 to the intermediate plate portion 4.
It is press-fitted in the state of being tilted in direction b, and the cut and raised portion 4c is moved upright to a position where it engages with the lower end of the slotted hole 5b. It is held in elastic contact with the inside left side.

This connector 2 is attached and fixed to the board 1 by inserting the terminal portion 4a of the contact pin 4 in Fig. 1 into the board 1 and electrically connecting the protruding portion to the print with solder 6. In Fig. 1, 7 denotes an electric wire, the wire 7a being covered with a coating 7b and a predetermined length of the wire 7a being exposed at the tip. The electric wire 7 is inserted from the upper end of the hole 5 in the mold 3, and the wire 7a is further inserted into the hole 4f of the contact pin 4 and the coating 7b is removed.
At this time, the tip of the wire 7a is located between the intermediate plate portion 4b and the tip of the dog-leg plate portion 4e.

Here, when the mold 3 in FIG. 1 is pressed downward and brought into contact with the upper surface of the substrate 1 as shown in FIG.
The convex portion 4g of the doglegged plate portion 4e is guided into contact with the inclined step portion 5a, and then rides on the upper part of the hole 5, whereby the doglegged plate portion 4e is elastically pivoted to the right in the figure and clamps the wire 7a between its tip and the intermediate plate portion 4b. The electric wire 7 is thus electrically connected to the printed circuit board 1 via the contact pin 4.

In addition, when removing the electric wire 7, the mold 3 is
Pull it upward from the position shown in the figure, and cut and raise the part 4 in Figure 1.
It is only necessary to slide the wire 7a to the position where the wire 7a comes into contact with the lower end of the slot 5b, and the dogleg plate 4e returns to its elastic displacement to the left in the figure, releasing the clamping pressure on the wire 7a, thereby causing the wire 7 to move upward. It can be extracted.

However, according to the above-mentioned conventional example, the contact pin 4 is formed by bending a thin metal plate with a thickness of about 0.2 to 0.3 mm, and has a weak stiffness.
Since the spring property is used to elastically displace the material in the thickness direction, the overall spring property and structure are weak, making the operation unstable and prone to poor contact and reduced durability. The work of inserting the contact pin 4 into the hole 5 is also unstable and difficult to apply to automation, and the exposed length of the wire 7a must be at least as long as the length in the vertical direction of the doglegged plate portion 4e. Therefore, there is a disadvantage that the peeling area of the sheathing 7b becomes large and the workability is reduced.
There is a drawback that it is difficult to insert the tip of the wire 7a into the hole 4f of the upper plate part 4d during insertion, and when a plurality of connectors 2 are arranged in parallel, and a plurality of holes 5 are arranged in the mold 3 of the connector 2 in parallel. When a multi-connected type connector is used, since the width of the contact pins 4 is relatively large, the pitch of the holes 5 is also large, resulting in an increase in the size of the connector 2.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

3 and 4 are longitudinal sectional side views showing the states of one embodiment of the connector according to the present invention when wires are inserted and wires are clamped, respectively.
Components that are the same as those in the drawings are given the same reference numerals and their explanations will be omitted.

In the figure, a connector 11 is formed by assembling a resin mold 12 and metal contact pins 13. As shown in FIGS. 5A to 5C, the mold 12 has a substantially rectangular prism shape with a pair of legs 12a integrally projecting from the lower ends of both sides, and a through-mounting hole 14 provided in the vertical direction at the center. The mounting hole 14 has an upper part as a circular hole 14a with an inner diameter _l1 , a middle part as an intermediate flat hole 14b with a rectangular cross-section and a thickness direction dimension _l2 , and a lower part with a thickness direction dimension _l3 (however l ₃ > l ₂ ) The lower flat hole 14c has an evenly rectangular cross section. Further, the circular hole 14a has a pair of opposing plane parts 14g over the entire length on both sides of the inner circumference.
At the same time, a pair of tapered guide portions 14d are provided on the other both sides of the bottom of the circular hole 14a, and a pair of tapered guide portions 14e are provided on both sides of one of the upper ends of the intermediate flat hole 14b. A pair of tapered guide portions 14f are provided on the other sides of the upper end of the hole 14c.
(The tapered guide portions 14d are each cut at the center). A beam portion 15 having a U-shaped cross section is integrally provided between the other two sides of the lower end of the lower flat hole 14c, and a V-shaped recess 12b is provided inside the pair of leg portions 12a, respectively.

The contact pin 13 is made of a relatively thick metal plate with a thickness of about 0.6 mm, and has a terminal portion 13b with a stepped portion 13a at the lower end as shown in FIG. 3, and a pair of V-shaped protrusions on both sides of the middle portion. A pair of clamping pressure parts 1 are provided at the upper end by a U-shaped notch 13d.
3e can be provided. The pair of clamping pressure parts 13e are provided with tapered guide parts 16a at the upper ends of both inner sides of the notch parts 13d, and a convex part 16b is provided at the middle of both inner sides. The lower end of the tapered guide portion 16a is a stepped portion 16c.
It is as follows.

The contact pin 13 connects its clamping pressure portion 13e to the lower flat hole 14 from below the hole 14 of the mold 12.
c. The tapered guide portion 14f is inserted into the intermediate flat hole 14b and attached as shown in FIG. At this time, the beam portion 15 of the mold 12 relatively enters into the notch portion 13d of the contact pin 13, is guided by the tapered guide portion 16a and the convex portion 16b in order, and passes over these and enters below the convex portion 16b. In this way, the contact pin 13 connects the convex portion 16b to the beam portion 15.
The connector 11 is completed by attaching it to the mold 12 while making contact with the upper surface. At this time, the pair of convex portions 13c are located below the leg portions 12a, and the clamping pressure portion 1
The upper end of 3e is close to tapered guide portions 14d and 14e.

This connector 11 is fixed by inserting the terminal portion 13b of the contact pin 13 in FIG. .
Here, the electric wire 7 is connected to the circular hole 14 of the hole 14 of the mold 12.
Although the wire 7a is inserted from the lower end of the circular hole 14a, the other both sides are smoothly guided by a pair of taper parts 14d, and then the wire 7a is guided by a pair of taper parts 14d of the clamping part 13e of the contact pin 13. Part 16
The lower end of the wire 7a reaches approximately the vicinity of the protrusion 16b when the end of the sheath 7b comes into contact with the bottom of the circular hole 14a.

When the mold 12 in FIG. 3 is pressed and slid downward and brought into contact with the upper surface of the substrate 1 as shown in FIG. The upper ends of the pair of clamping pressure parts 13e are respectively tapered guide parts 14e.
The circular hole 14a is elastically displaced inward by being guided in contact with the circular hole 14a.
It rides on a pair of flat parts 14g. Therefore, each clamping pressure part 13e is elastically pivoted inward, and clamps the wire 7a between the step part 16c at the lower end of the tapered guide part 16a. At this time, the beam portion 15 reaches the lower end of the notch portion 13d, and the pair of convex portions 13c of the contact pin 13 rides inside the pair of leg portions 12a, and then elastically engages with the concave portions 12b, so that both ，
13 relative positions are determined accurately.

The tapered part 14e is the wire 7 of the clamping part 13e.
It is located on the outside of the stepped portion 16c that is clamping pressure on a, and the clamping pressure is directly applied to the stepped portion 16c. The electric wire 7 is thus electrically connected to the printed circuit board 1 via the contact pin 13.

In addition, when removing the electric wire 7, remove the mold 12 from the fourth
It is sufficient to pull it upward from the position shown in the figure and slide it to the position where the beam part 15 contacts the convex part 16b as shown in FIG. 14g,
They each elastically return to their outward rotational displacement via the tapered guide portion 14e, releasing the clamping pressure on the wire 7a. Thereby, the electric wire 7 can be easily pulled out upward.

According to the above configuration and operation, contact pin 1
3 uses a metal plate with a relatively large thickness of about 0.6 mm without requiring complicated processing such as bending, so the contact pin 13 itself has high strength and a pair of connectors Since the springiness of 13e is used in the extending direction of the metal plate to strengthen the structure and springiness, the overall structure and operation are stable, and the connector 11 is stable without wobbling when the wire 7a is clamped. At the same time, good contact function and durability can be obtained. In this case, a pair of clamping pressure parts 13e
Since each outer side of the clamping member is regulated by being in elastic contact with the pair of flat portions 14g, the clamping operation is more stable and strong. Further, the exposed length of the wire 7a may be relatively small, at least the dimension between the bottom of the circular hole 14a and the lower part of the tapered guide portion 16a of the clamping pressure portion 13e, and the exposed area of the coating 7b is reduced, improving workability. sell. Further, when inserting the electric wire 7, the tip of the wire 7a is guided by the pair of tapered guide portions 14d at the bottom of the circular hole 14a and the tapered guide portion 16a of the clamping pressure portion 13e, so that the insertion work is easy. Further, since the contact pin 13 itself is strong and is attached to the mold 12 by inserting the beam portion 15 into the notch 13d, the attachment work of both 12 and 13 is simple and can be easily applied to automation. Further, since the contact pin 13 is simply a single plate without any bending or other processing, and the hole 14 is also mainly a hole with a flat cross section,
The mounting pitch of the connector 11 in the width direction and the connector width dimension when the plurality of holes 14 and contact pins 13 are integrally arranged in parallel in the mold 11 can be reduced, thereby making it possible to miniaturize the device. Furthermore, since the contact pins 13 have a simple shape and the connector 11 itself is small, costs can be significantly reduced. Furthermore, when the wire 7a is clamped, the pair of convex portions 13c of the contact pin 13 engages with the concave portions 12b of the leg portions 12a and locks both 12 and 13, which prevents the mold 12 from lifting up. The configuration can be stabilized.

In the above embodiment, both outer sides of the pair of clamping parts 13e of the contact pin 13 are connected to the pair of flat parts 14.
The middle flat hole 1 except for the part pressed by g
Although it is tapered to be easily guided by the pair of tapered guide portions 14e of the mounting hole 14b, the shape is not limited to this, and the mounting hole 14 may have a straight shape that penetrates only the inner side of one of both sides in the axial direction, and Of the pair of clamping pressure parts 13e, the outer side of the clamping pressure part 13e is made straight in the axial direction, and the contact pin 13 is pushed into the mounting hole 14 using both straight parts as guides (at this time, the one clamping pressure part 13e is Alternatively, only the other clamping pressure part 13e may be elastically displaced inward by guide restriction by one tapered guide part 14e on the other side of the mounting hole 14 to clamp the wire 7a.

As described above, the wire-to-board connector of the present invention has a terminal portion connected to and electrically connected to a printed circuit board at one end, and an elastic bifurcated portion at the other end. The shaped part has a stepped part for clamping the electric wire near the tip, a locking convex part located on the base side of the elastic bifurcated part from the stepped part, and is provided opposite to the terminal part, and has an elastic forked part. A metal contact pin has a configuration in which an engaging convex portion is provided on the outside of the intermediate portion with the forked portion, and the contact pin is accommodated in a through hole and provided so as to be slidable in the longitudinal direction of the contact pin. There is a beam portion in the through hole that is locked with the locking convex portion to restrict sliding toward the other end of the contact pin at an intermediate position, and a beam portion that is located in the middle of the through hole in the direction of one end of the contact pin. a resin molded body provided with a stepped guide portion that acts on the elastic bifurcated portions and elastically displaces them in a direction toward each other when slid toward each other, and a recessed portion that engages with the engaging convex portion; With the electric wire inserted from one end of the through hole and inserted between the elastic bifurcated parts, the resin molded body is slid toward one end of the contact pin, and the stepped guide part The electric wire is pressed between the stepped portions of the elastic bifurcated portion, and the electric wire is clamped between the stepped portions, so that the stepped portions are bitten into the electric wire. It is possible to maintain good electrical continuity between the electric wire and the contact pin, and since the clamping pressure from the stepped guide section is concentrated on the stepped section and acts directly, the stepped section applies strong clamping pressure to the wire. By digging deeply into the wire, it is possible to further improve the electrical conduction, thereby improving the reliability of the electrical connection, and the opposing protrusions are sufficiently Because of its strong strength, it is possible to reliably prevent the mold from slipping out even if the resin mold is pulled out with strong force, and the strength reliability can be guaranteed. It is possible to perform accurate positioning and prevent it from coming off.
Furthermore, since the contact pin can be simply formed into a flat plate rather than a relatively thick metal plate, it has great strength without requiring complicated processing, and its springiness can be used in the extending direction of the metal plate. The structure and operation can be stabilized to obtain good contact function and durability, and the contact pin is a bare wire that is inserted into the mold of the wire in order to clamp the wire with the forked portion at the other end. Since the length of the wire can be shortened, work efficiency can be improved by reducing the amount of peeling of the coating, and since the contact pin has the flat plate shape described above, it can be strengthened, so the insertion work of the contact pin can be performed stably. It has the advantage of being applicable to automation, reducing the pitch between parallel arrangement of contact pins and downsizing the device, and further reducing the overall cost.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional side views showing the state of a conventional wire-to-board connector during insertion and clamping, respectively, and FIGS. 3 and 4 are wire-to-board connectors according to the present invention, respectively. FIGS. 5A to 5C are a plan view, a front view, and a side view, respectively, of the mold of the connector. 1... Printed circuit board, 2, 11... Connector,
3, 12...Mold, 4, 13...Contact pin, 4a, 13b...Terminal part, 4b...Top plate part, 4e...Dovetail plate part, 5, 14...Mounting hole,
5a... Inclined step part, 7... Electric wire, 7a... Wire, 7b... Covering, 13e... Clamping pressure part, 14a...
...Circular hole, 14b...Middle flat hole, 14c...Lower flat hole, 14d to 14f, 16a...Taper guide part, 15...Beam part.

Claims (1)

[Scope of utility model registration request] It has a terminal part connected to a printed circuit board at one end and an elastic fork part at the other end, and the elastic fork part has a step part near the tip that clamps the electric wire, and the step part Further, locking protrusions are provided at positions on the base side of the elastic bifurcated portion so as to face each other, and an engaging protrusion is provided on the outside of the intermediate portion between the terminal portion and the elastic bifurcated portion. The contact pin is housed in a through hole so as to be slidable in the longitudinal direction of the contact pin, and is locked with the locking protrusion in the through hole. a beam portion that restricts the sliding of the contact pin toward the other end at an intermediate position; The electric wire is inserted into the through-hole from one end, and the resin molded body is provided with a stepped guide portion that elastically displaces the electric wires in a direction toward each other, and a recessed portion that engages with the engaging convex portion. The resin molded body is slid toward one end of the contact pin while being inserted between the elastic two-pronged parts, and the stepped guide part is located at a portion of the elastic two-pronged part that corresponds to the stepped part. A wire-to-board connector configured by pressing the wire and pinching the wire between the stepped portions.