JPS5825348Y2 - conductive contact pin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive contact pin used in a checker that inspects equipment that handles relatively large currents, such as switching regulators.

Generally, each output terminal of a switching regulator is formed by a head screw, but to measure the output voltage or output current of this regulator, a checker with a number of conductive contact pins that simultaneously contact the head of each terminal screw is used. is used.

Conventionally, this type of conductive contact pin has a conical recess formed in the head as shown in Figure 1, but according to this pin, each terminal screw of a switching regulator When placing pins on each head, even if there are slight variations in the mounting positions of the terminal screws, the conical wall surface of each pin acts as a guide, so each pin can be accurately guided to the head of the corresponding screw. It has the advantage of being easy to use.

However, in this case, since the contact portion between the conical wall surface of each pin and the screw head is an annular line contact, the contact area between the two is small.

For this reason, when such a pin is left in contact with the head of a terminal screw through which a relatively large current (more than IOA) is being applied for a long time, the amount of Joule heat increases, and the pin
Since the pin is heated to a temperature of about 0 to 60°C, it has been pointed out that measurement errors and deterioration of the pin material are caused by this.

Therefore, an object of the present invention is to provide a conductive contact pin that is less likely to heat up even when a relatively large current is applied for a long period of time.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Referring to FIGS. 2 and 3, this conductive contact pin 1
includes a stem 2 and an enlarged-diameter head 3 connected to the stem 2.

Both the stem 2 and the head 3 are made of a good electrical conductor such as brass, and a hemispherical recess 4 is formed in the end face of the head 3.

The overall curvature of the spherical shape of this recess 4 is selected to be approximately equal to the curvature of the head 6 of the terminal screw 5 of the switching regulator, but the curvature of the mouth edge portion is
The curvature is slightly larger than that of the hem.

As a result, when the head 6 of the terminal screw 5 is brought into contact with the recess 4 of the head 3 of the pin 1, the two fit together almost perfectly, leaving a slight gap at the opening edge of the recess 4.

In this case, in the example shown in the drawing, in the center of the recess 4,
A tapered hole 7 extending in the axial direction of the head 3 is bored, and this is intended to provide a heat dissipation effect from the center of the head 4.

When inspecting the circuit of a switching regulator, conductive contact pins 1 that match the curvature and diameter of the head of each terminal screw of this regulator are attached to predetermined locations on the checker, and each pin 1 is connected to the head of the corresponding terminal screw 5. 6, and input the output to each desired terminal screw to the checker via pin 1.

Through this operation, the hemispherical recess 4 formed in the head 3
has a curvature that is approximately equal to the curvature of the screw head 6, so the spherical wall of the four parts 4 has a curvature that is approximately equal to the curvature of the screw head 6.
It will come into face-to-face contact with the surface.

Therefore, even if the pin 1 is kept in contact with a terminal screw to which a relatively large current is applied for a long time, the Joule heat generated due to the large contact area is reduced, and the pin 1 will not be heated.

Furthermore, by providing the tapered hole T in the center of the recess 4, heat is not accumulated within the pin 1, and the pin 1 can be more effectively maintained at around room temperature.

On the other hand, since the diameter of the recess 4 is formed to be slightly larger than the diameter of the screw head 6, the pin 1 can be reliably mounted using the spherical wall of the recess 4 as a guide even if there is some variation in the mounting position of the terminal screw. It will be guided onto the screw head 6.

However, the curvature of the spherical shape of the recess 4 is preferably selected such that at least about 50 to 70 parts of the spherical wall of the recess 4 are in contact with the surface of the screw head 60.

Further, a plurality of holes 7 may be provided as long as the contact area between the recess 4 and the surface of the screw head 6 is not extremely reduced.

As explained above, according to the present invention, it is possible to obtain a conductive contact pin that does not heat up even when brought into contact with a terminal screw through which a relatively large current is applied for a long time.

[Brief explanation of drawings]

Figure 1 is a side view showing the contact state between a conventional conductive contact pin and a terminal screw, Figure 2 is a partially cutaway perspective view showing the conductive contact pin of the present invention, and Figure 3 is a conductive contact pin and terminal screw of the present invention. It is a side view which shows the contact state of. 1... Conductive contact pin, 2... Stem,
3...Head, 4...Concavity, 7...
...hole.

Claims (1)

[Scope of utility model registration request] It has a stem 2 and a head 3 connected to the stem 2,
The head 3 is characterized by being provided with a hemispherical recess 4 and a heat radiation hole 7 extending in the axial direction of the head 3 at the bottom of the recess 4. Conductive contact pin.