JPS62216182A - Socket contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to socket contacts used for electrical connections.

[Conventional technology]

Conventionally, there is a socket contact shown in FIG. 10. The socket contact 1 shown in FIG. 10 has a socket portion 3 made by bending a conductive plate.

The socket part 3 has a pair of contact spring pieces 5 and a support part 7 connecting one end of the contact spring pieces 5. A fitting portion 9 is formed at the tip of the contact spring piece 5 . A mating contact 11 such as a pin contact is inserted between the fitting portions 9, thereby establishing electrical contact.

When the mating contact 11 is inserted between the contact spring pieces 5, the interval between the fitting parts 9 is widened. At the same time, an elastic restoring force (
That is, the restoring force (P) of the contact spring piece 5 increases. Also, since the slope θ of the tangent at the contact point decreases, the other contact 11
The insertion force with respect to the insertion distance changes according to a curve as shown in FIG. As you can see from this curve,
After the parallel portion 13 of the mating contact 11 passes the top of the fitting portion 9, the insertion force Fo becomes constant. In addition, the insertion force F
, is consistent with the extraction force.

[Problem that the invention seeks to solve]

By the way, in such a socket contact 1, the maximum value FMAx of the insertion force F generated at the contact point between the fitting part 9 and the mating contact 11 is a constant insertion force F.

It may increase several times.

For this reason, socket contact 1 and mating contact) 11
In the case of a connector incorporating multiple cores, there is a problem in that an extremely large insertion force F is required.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a socket contact which requires less insertion force when inserting a mating contact while ensuring the required contact force.

[Means for Solving the Problems] According to the present invention, there is provided a cylindrical conductive socket portion for receiving a mating contact, and a midway portion in the axial direction of the socket portion is set as a fulcrum on one inner surface of the socket portion. conductive contact spring pieces incorporated so as to be able to see-saw, the contact spring pieces being at both ends in the axial direction of the cylinder.

There is obtained a socket contact characterized in that each of the socket contacts has a contact portion, and a mating contact is inserted between the contact portion and the opposite inner surface of the socket portion.

〔Example〕

1 to 5 show two embodiments of the socket contact of the present invention.

The illustrated socket contact 21 has a socket portion 23 made by bending a conductive plate. This socket part 23 connects both opposing sides of the conductive plate to the upper surface part 2.
5 and made into a cylindrical shape.

In addition to the top surface portion 25, the socket portion 23 has a pair of side surface portions 27.
and a bottom portion 29. At the tip of the socket part 23, there is an upper tip of the paired side surface part 27.

The notch made by cutting out the tip end surface of the upper surface part 25 is the step part 3.
1 is formed.

In the notch, a pair of windows 33 are formed slightly rearward of the stepped portion 31, in which the bent corner portions of the upper surface portion 25 and the paired side portions 27 are formed into elongated holes.

Inside the socket portion 23, a strip-shaped contact spring piece 36 made of a single conductive plate is provided. The contact spring piece 36 is an intermediate portion in the longitudinal direction.

That is, the engaging portion 39 is made slightly wider and has a pair of engaging pieces 41'. These engaging pieces 41 are inserted into the windows 33 of the socket portion 23. Thus, the binding piece 4
1 by engaging the edge of the window 33, the contact spring piece 36
prevent the departure of In reality, the contact spring piece 36 is assembled with the socket portion 23 in a slightly floating state.

The engagement portion 39 of the contact spring piece 36 has a top portion C formed by bending the center portion into a dogleg shape. That is, the contact spring piece 36 is assembled into the socket portion 23 so that the engagement piece 41 engages with the lower edge of the window 33 and the top portion C contacts the lower surface of the upper surface portion 25 of the socket portion 23 . The contact spring piece 36 is thus capable of shear movement as the top cl fulcrum.

The notch of the socket part 23 has a contact spring piece 3 between the stepped parts 31.
The tip 47 of 6 is slightly bent upward and protrudes. As shown in FIG. 6, a contact point A is formed at the tip end 47 of the contact spring piece 36 for contacting a mating contact 50 such as a pin contact. Further, a contact point B is formed at the rear end portion 52 of the contact spring piece 36. The contact point B is closer to the bottom surface portion 29 of the socket portion 23 than the contact point A of the tip portion 47 . A contact point is formed on the bottom surface 29 of the socket portion 23 by a protrusion 45 that projects toward the top surface 25 .

Now, insert the mating contact 50 into the opening at the tip of the socket portion 23, as shown in FIG. At the beginning of insertion, the contact point A does not contact the mating contact 50 or only lightly contacts it. When the mating contact 50 is inserted further in, the contact point B is pushed up as shown by the arrow 51 in FIG. As a result, there is a gap between the contact spring piece 36 and the mating contact 50, as shown in FIG.

Contact forces PA and PB are applied corresponding to contact point A and contact point B.

Here, the distance L between the contact point A and the top C of the contact spring piece 36 is
A is made shorter than the distance between the top C and the contact point B. What is the relationship between contact forces PA and PB?

The principle of lever leads to the following equation.

PA/PB=LB/LA...
...(1) Also, the reaction force Pc generated at the top C is obtained by the following equation.

Pc=PA0P,=(LA+LB)・PB/LA
-・---(2) Note that a contact force equal to the two reaction forces Pc is generated at the contact point.

Since LB>LA, according to the above equations (1) and (2), there is a large contact force PA at the contact point A and the contact point, compared to the contact force P obtained by the elastic deformation of the contact spring piece 36.
, PC can be obtained.

Next, the insertion force of the mating contact 50 will be explained with reference to FIGS. 5 to 8. At the beginning of insertion of the other contact (50), it is inserted without touching the contact point A. Alternatively, even if it does touch, the contact spring piece 36 will rotate clockwise about the fulcrum C, so it will be inserted in a state that is substantially the same as if it were not touched. Therefore, the mating contact 50 can be inserted with almost no insertion force required.

When the tip of the mating contact 50 approaches the contact point B side, it pushes up a point between the contact points B and C.

At or near the contact point B, the contact force PR gradually increases and then rapidly decreases. Therefore, an insertion force curve like line B shown in FIG. 8 is obtained.

Since the contact point A or the contact point is in contact with the equal diameter part of the mating contact 50, the insertion force at these contact points A and D is calculated by multiplying the respective contact forces PA and PC by the friction coefficient μ. It is something. Therefore, the insertion force increases in proportion to the contact force P, as shown by lines A and D in FIG.

The actual insertion force of the mating contact 50 is the sum of the insertion forces at the contact point A, the contact point B, and the contact point. That is, the total insertion force is as shown by line E in FIG.

In this way, the maximum value of the insertion force (the peak value of the E line) does not become much larger than the withdrawal force (the constant value of the E line).

This is due to the relatively small spring force at contact point B. That is, even if the insertion peak value at contact point B is increased,
Because it is small compared to the magnitude of the force at other contact points A and B,
This is because it does not have much of an impact on the whole.

As shown in FIG. 9, the edge of the window 33 formed in the socket portion 23 of the socket contact 21 is partially removed to form an insertion groove 53, and the engagement piece 41 of the contact spring piece 36 is passed through this insertion groove 53. It may also be fitted into the window 33. According to this structure.

The work of assembling the contact spring piece 36 into the socket contact 21 becomes easier.

〔Effect of the invention〕

As explained above using the embodiments, according to the socket contact of the present invention, a contact spring piece is rotatably assembled inside the cylindrical socket part using the top part as a fulcrum,
When inserting the mating contact, the action of the contact spring piece makes it possible to keep the insertion force small while ensuring a constant contact force. Therefore, a socket contact suitable for multi-core connectors can be provided.

[Brief explanation of drawings]

1 is a perspective view showing the main parts of a socket contact according to an embodiment of the present invention, FIG. 2 is a perspective view of a contact spring piece incorporated in the socket contact of FIG. 1, and FIG. 4 is a front view of the socket contact in FIG. 1, FIG. 5 is a side sectional view of the socket contact in FIG. 1, and FIG. 6 is a socket contact in FIG. 5. 7 is a side sectional view showing the state of contact between the socket contact of FIG. 6 and the mating contact, and FIG. 8 is a side sectional view showing the state of contact between the socket contact of FIG. 1 and the mating contact. A graph showing the insertion force and insertion distance with a contact, Fig. 9 is a perspective view showing another embodiment of the present invention in an exploded state, and Fig. 10 is a schematic diagram when a mating contact is inserted into a conventional socket contact. figure,
Figure 11 is. It is a graph showing the insertion force and insertion distance of a conventional socket contact and a mating contact. 1; socket contact, 3; socket part, 5; contact spring piece, 9; fitting part, 11; mating contact), 21; socket contact, 23; socket part, 3 pieces; notch is stepped part, 33: window, 36; contact spring piece, 39; engaging portion, 47;
Tip end, 50; mating contact, 52; rear end. □Insertion distance

Claims (2)

[Claims] (1) It includes a cylindrical conductive socket portion that receives a mating contact, and a conductive contact spring piece that is incorporated into one inner surface of the socket portion so as to be able to see-saw movement using the middle portion in the cylindrical axis direction as a fulcrum. , the contact spring piece has contact portions at both ends in the axial direction of the cylinder, and a mating contact is inserted between the contact portion and the opposite inner surface of the socket portion. . (2) Of the two contacts of the contact spring piece, the distance from the contact part located on the entrance side of the socket part to the fulcrum is:
The socket contact according to claim 1, wherein the distance is shorter than the distance from the contact portion located on the inner side of the socket portion to the fulcrum.