JPH0131965Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clip useful as a jig for electrical measurement, and more specifically, the present invention relates to a clip useful as a jig for electrical measurement. This relates to a clip that has a larger contact area with a screw-shaped terminal in a measuring device, allowing more current to flow through it.

[Prior Art] Clip codes are often used in electrical measurements. These clips include bagworm clips and alligator clips, but either type of clip has a structure in which a large number of triangular tooth-shaped irregularities are formed on both inner edges of the tip, and these are interlocked with each other.

By the way, for power supplies with large output current,
Tap-cut output terminals with a stud-like structure are often used. Conventionally, when adjusting such a power supply, bagworm clips, etc. cannot be used, so the output wire with a crimp terminal attached to the tip is tightened to the threaded part of the output terminal using a nut. It had to be done.

[Problems to be solved by the invention] The work of tightening or removing the output wires to the output terminals using nuts is extremely cumbersome, and as a result, it takes a long time to prepare for adjusting the device under test. This caused extremely low work efficiency. The reason why conventionally known alligator clips and bagworm clips could not be applied to output terminals with a structure such as the stud bolt described above is that the contact between the clip and the output terminal was a point contact, and too much current was generated. This is because the current is not allowed to flow (normally a few amperes is the limit) and the voltage drop at the contact area is large. For this reason,
I had no choice but to attach the output wire by tightening it with a nut as described above.

It is an object of the present invention to provide a clip for electrical measurement which can overcome the drawbacks of the prior art as described above and which can sufficiently flow even a relatively large current of several + amps.

[Means for solving the problem] The present invention, which can achieve the above objectives, adds innovation to the shape of the tip of the clip body to increase the contact area with the terminal part of the device under test. This electrical measurement clip has a structure in which half-nut-shaped abutment pieces are attached to the inner sides of both ends of the clip body so that the threaded portions face each other.

Here, the threaded portion of the half-nut-shaped abutment piece is made to correspond exactly to the threaded portion formed on the stud-shaped terminal of the device to be measured. In this way, when the terminal of the device under test is held between the contact pieces of the clip, both threaded parts will mesh properly.
This makes the contact area extremely large and allows a large current to flow. Furthermore, since the contact resistance is small, the voltage drop at the clip is extremely small, allowing for highly accurate measurements.

[Example] Hereinafter, the present invention will be explained in more detail based on the drawings. FIG. 1 is an explanatory view showing one embodiment of the clip according to the present invention, and FIG. 2 is an enlarged view of the tip thereof. The basic structure of the clip body 1 may be substantially the same as a conventional one. That is, the two clamping members 2 are assembled so as to face each other, and a pin 3 is inserted through the center to pivotally connect them, and a scissor-shaped spring 4 is incorporated to create a resilient force that closes the tips of both clamping members 2a and 2b. It is configured so that it can be granted. Here, both clamping members 2a and 2b are made of a good conductor, and the core wire portion of the cord 5 is electrically connected to the inner side of the proximal end of one of them (the 2b side in this case) by soldering or the like. Almost all of them except for the tip are covered with a vinyl coating 6 or the like, thereby maintaining electrical insulation and ensuring safety for workers.

Now, the points where the present invention is significantly different from the conventional technology are as follows.
The main feature is that half-nut-shaped abutment pieces 7 are provided inside both ends of the clip body 1 so that their threaded portions 8 face each other. It is assumed that the threaded portion 8 formed on the contact piece 7 coincides with the threaded portion formed on the terminal of the device to be measured. This abutting piece 7 is also made of a good conductor and is usually fixed to the clip body 1 by welding or soldering.

With this configuration, the operator who adjusts the device under test pinches the base ends of the clamping members 2a and 2b, spreads out the tips, and splits the terminal of the device under test between the nut-shaped contact pieces 7. When the terminal is inserted into the terminal and the finger is released in this state, the terminal and the contact piece 7 are pressed into close contact with each other by the elastic force of the scissor-shaped spring 4 so that the threaded portions engage with each other. As a result, the contact area between the two becomes extremely large, the contact resistance is low, and a large current can flow.

FIG. 3 shows another embodiment of the clip according to the present invention. In this case as well, the clip body 11
Half-nut-shaped abutment pieces 7 are provided on the inner sides of both ends of the holder so as to face each other. The description of the clip body 11 will be omitted, but in short, it can be of any structure, not limited to the one shown, as long as its tip can be contracted and closed by the elastic force of a spring. Good too. The function of the clip in this embodiment is the same as that in the previous case, so a description thereof will be omitted.

[Effects of the invention] As described above, the present invention has a structure in which a half-nut-shaped contact piece is provided at the tip of the clip body, so
The contact area with the stud-like screw terminal of the device under test is extremely large, and as a result, even fairly large currents can be passed through, and the voltage drop across the clip is reduced. Therefore, the work of attaching output wires, which conventionally required tightening each time using a nut, can be done with one touch by using the clip according to the present invention, making measurement work extremely easy and quick. This has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the clip according to the present invention, FIG. 2 is an enlarged perspective view of the tip thereof, and FIG. 3 is an explanatory diagram showing another embodiment of the clip according to the present invention. . DESCRIPTION OF SYMBOLS 1... Clip main body, 2a, 2b... Holding member, 3... Pin, 4... Scissor-shaped spring, 7... Contact piece, 8... Threaded part.

Claims (1)

[Scope of utility model registration request] A clip for electrical measurement that has half-nut-shaped abutment pieces facing each other on the inside of both ends of the clip body.