JPH0129581Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lead rod included in measuring instruments such as testers and multimeters.

Conventional technology Conventionally, multimeters, testers, etc. that can multiplexly measure voltage, current, resistance, etc. often have fuses installed in the terminals to prevent circuit damage due to range errors, incorrect measurement terminals, or excessive input. many. When replacing a fuse, insert a flathead screwdriver, coin, etc. into the slit in the head of the terminal, rotate the terminal to disconnect it from the measuring equipment case, take the terminal out of the measuring equipment case, and insert the new fuse. are being replaced.

Problems with the conventional technology Therefore, if you have a flathead screwdriver or a coin on hand and can use them immediately, there is not much of a problem, but if you do not have them on hand, it will take time to replace the fuse and measurement will be delayed. .

Purpose of the invention The present invention was made by focusing on these problems.Measuring instruments such as multimeters and testers always have lead rods for measurement or connection, so terminals are attached to the lead rods. A fitting part is provided to fit into the head, and it is intended to be provided as a lead rod for measuring equipment.

Summary of the Invention The lead rod for a measuring instrument according to the present invention has fitting parts 19, 21, and 23 that fit into the head 47 of the terminal 37 facing outside from the measuring instrument case 25.

Embodiment Figure 1 is a front view 1-1 showing an embodiment of the present invention.
and its left side view 1-2.

In the figure, 11 is a metal rod having a conical projection 13 at its tip, and a lead wire (not shown) is connected to the other end of the metal rod 11, forming a conductive part.

15 is a resin body such as synthetic resin, and metal rod 1
The connecting portion between the lead wire and the lead wire is covered and insulated, and also constitutes a gripping operation portion for the lead rod.

Reference numeral 17 denotes a ring-shaped protrusion provided around the middle portion of the resin body, and is used to prevent a hand holding the lead rod from touching the exposed metal rod 11 and receiving an electric shock.

19 and 21 are triangular protrusions provided on the truncated cone-shaped tip 23 of the resin body 15 located at the tip of the annular protrusion 17, and the metal rod 11 is provided on the tapered surface of the truncated cone.
It protrudes symmetrically around the center and forms a fitting part with the head of the terminal, which will be described later.

Figure 2 shows a schematic configuration diagram of the terminal surrounding the terminal, in which the terminal to which the tip fitting portion of the lead rod for the measuring device shown in this embodiment fits is fixed to the measuring device case, and the right side of the terminal. This is Figure 2-2.

In the figure, 25 is a measuring equipment case;
Connect one end of the terminal insertion cylinder 27 and the contact spring 29 with the screw 3.
A protrusion 34 for one stop is provided. Two grooves 33 and 35 are provided in the inner wall of the terminal insertion cylinder 27 symmetrically with respect to the central axis, and constitute passages for the fixing protrusions 39 and 41 when the terminal 37 is inserted.

The terminal 37 is connected to the metal cylinder 4 inside the insulating cylinder 43.
5 is inserted and fixed, and electrical connection is made through the metal cylinder 45. The head 47 of the insulating cylinder 43 has
Two recesses 49 and 51 are provided symmetrically about the central axis. A fuse holder 53 is constructed at the end of the metal cylinder 45 that corresponds to the terminal head 47.

A fuse 55 has one end inserted and fixed into the fuse holder 53 and the other end pressed by the contact spring 29.

Note that 57 is a lead wire for wiring inside the measuring device.

Hereinafter, the operation for removing the terminal when replacing the fuse will be explained using the lead rod for measuring equipment shown in this example.

First, the tip of the lead rod for the measuring device is fitted into the head 47 of the terminal fixed to the measuring device case 25 and facing outside. Then, the exposed metal rod 11 protrudes from the tip of the lead rod and connects to the metal cylinder 4 of the terminal.
Triangular protrusions 19 and 21 that are inserted into the resin body 15 and come into contact with the inner wall of the resin body 15 and constitute a fitting part of the resin body 15.
and the recesses 49 and 51 of the terminal head 47 are fitted into each other.

Next, rotate the lead rod 90 degrees and release the contact spring 29.
, align the fixing protrusions 39 and 41 of the terminal fixed to the end of the terminal insertion cylinder 27 with the grooves 33 and 35 of the terminal insertion cylinder 27, and release the fixation of the terminal 37.
Remove the terminal 37 from the case and replace the fuse 55 with a new one.

In this embodiment, substantially negative recesses 49 and 51 are provided in the head 47 of the terminal, and a substantially negative protrusion 1 that fits into the tip of the lead rod for the measuring instrument is provided.
9 and 21, however, it is also possible to provide a recess in an arbitrary shape on the head of the terminal and provide a protrusion that fits in the tip of the lead rod for the measuring device, or conversely, a recess in an arbitrary shape may be provided on the head of the terminal. A protrusion having the shape of may be provided, and a recess may be provided at the tip of the lead rod for a measuring device to fit therein.

Effects of the invention Since the present invention has the configuration described above, when replacing the fuse in the terminal of a measuring device such as a multimeter or tester, the provided lead rod can be used, so measurements can be performed immediately without taking much time. Can be restarted.

[Brief explanation of the drawing]

FIG. 1 is a front view and a left side view showing an embodiment of the present invention. FIG. 2 is a schematic configuration diagram around the terminal in which the terminal is attached and fixed to the measuring instrument case, and a right side view of the terminal. 11... Metal rod, 15... Resin body, 19, 21
...triangular projection, 23... truncated conical tip, 2
5...Measuring equipment case, 37...Terminal, 43...
Insulating cylinder, 47...terminal head, 49, 51...recess.

Claims (1)

[Scope of utility model registration request] A lead rod for measuring equipment that has a fitting part that fits with the head of the terminal facing outside from the measuring equipment case.