JPS6230291Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a plug, and more specifically, to a plug with a safety cover.

This type of covered plug is widely used as a measuring plug for testers and the like, and has a structure in which a contact is covered with a cylindrical electrically insulating cover so that its conductive portion is not exposed. That is, as shown in FIG.
and the contact 12 are connected by a contact holding fitting 14, and a cylindrical cover 16 is attached around the contact holding fitting 14. In this case, conventionally, the lead wire 1
0 and the contact 12 are connected, and then placed in a mold and a cover is integrally molded around it, which not only increases production costs, but also makes repair extremely difficult if the lead wire breaks. be. Further, the length of the cover must be increased in relation to the contact 12 in order to maintain a safe distance between the cover tip 16a and the contact tip 12a. For this reason, the main device (such as a tester) into which the plug is inserted inevitably becomes thicker, which has been an obstacle to making the device main body thinner. Furthermore, if a conductor such as a screwdriver is accidentally inserted through the opening at the tip of the cover, there is a risk that it will come into contact with the tip 12a of the contact and cause an electric shock.

This invention was made to eliminate the drawbacks of the conventional plugs described above, and aims to provide a plug that is easy to manufacture and repair and can be shortened and made smaller without compromising safety.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

That is, this invention provides a plug with a plug cover in which a contactor is covered with a cylindrical electrically insulating cover, which has an electrically insulating core removably attached to the cover within the cover, It is characterized in that a contact is disposed on the outer periphery of the core except for the tip end of the core.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

As shown in FIGS. 2 and 3, this plug has a cylindrical cover 18 made of an electrically insulating material that is removably attached to the contacts 22 and lead wires 26. . That is, this cover 18 has a female threaded portion 18a inside thereof, and the electrically insulating core 20 is connected to the female threaded portion 18a.
The core 20 is threadedly engaged with a male threaded portion 20a carved in the base of the core 20, and the core 20 can be removably housed therein. A contact 22 is disposed on the outer periphery of the core 20, leaving the tip 20b intact. In this case, the contactor 22 is electrically connected to the core wire 24 through the support piece 36 by soldering or crimping, and is also fixed to the lead wire 26 by crimping or the like. Here, referring to FIG. 4, the core 20 is made of a cylindrical body, and a groove 28 is carved in the tip thereof, while a male threaded part 20a is carved in the base on the rear end side. , this male threaded portion 20a has
A notch 30 is provided along the axial direction. The above-mentioned support piece 36 connected to the contact 22 is fitted into the notch 30 . Furthermore, notch grooves 32 and 32' are provided in the circumferential direction on the distal end side of the base.

FIG. 5 shows a contact member 34 including the contact 22 described above. That is, this contact member 34 is a contact member 22 formed in a so-called banana shape.
, a support piece 36 integrally connected to the contact 22, an electrical connection fitting 38 and a fixing piece 40 formed on the free end side of the support piece 36, and each of these members can be made integrally, for example, by punching and bending a metal plate.

Next, the assembly procedure of this plug will be explained with reference to FIGS. 6 and 7. First, the core wire 24 of the lead wire 26 and the connecting fitting 38 are electrically and mechanically connected by soldering or caulking. , the fixing piece 40 is crimped onto the outer skin of the lead wire 26 to firmly connect the lead wire 26 and the contact member 34. Next, the core 20 is inserted into the contactor 22. As a result, as shown in FIG. 7, the tip 20b of the insulating core 20 protrudes from the tip of the contact 22, the contact 22 is disposed on the stem portion continuing from the tip of the core 20, and the support piece 36
enters the notch 30 of the core 20, and the core 20 and the contact member 34 are coupled. Thereafter, the core 20 is housed in the cover 18 by inserting the cover 18 from the end side (not shown) of the lead wire 26, and the core 20 is
A plug with a cover is formed by screwing together the male threaded portion 20a of the base of the cover 18 and the female threaded portion 18a of the cover 18. This screwing can be done using a screwdriver or the like using the groove 28 at the tip of the core 20, or by using the circumferential notch grooves 32, 32' provided at the tip of the core base. This can also be done by fixing the core 20 side with a jig having protrusions that fit into the grooves 32, 32' and rotating the plug cover 18.

As is clear from the above description of the embodiments, according to this invention, the cover is molded separately from the contacts and lead wires, and is removably attached to them by screwing, etc., so the manufacturing process This simplifies the process and reduces manufacturing costs, and even in the event of a break in the lead wire, the cover can be easily removed and repaired. Furthermore, since the tip of the electrically insulating core protrudes from the end of the contact, there is no need to worry about directly touching the contact even if a conductor is accidentally inserted into the cover. Therefore, the safety dimension of the cover can be shortened accordingly,
The main body side equipment such as a tester can be made thinner.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway view showing a conventional covered plug, Fig. 2 is a partially cutaway view showing an embodiment of the covered plug of this invention, Fig. 3 is a longitudinal sectional view of Fig. 2, and Fig. 4A The figure is a vertical cross-sectional view of the electrically insulating core.
Figure B is its left side view, Figure 4C is its bottom view, Figure 5A is its front view, Figure 5B is its left side view, Figure 5C is its top view, and Figure 6 is its insulation property. FIG. 7 is an assembled view of the core and the contact member. In the figure, 18 is a plug cover, 20 is an electrically insulating core, 20a is a threaded portion, 20b is a tip, 22 is a contact, and 26 is a lead wire.

Claims (1)

[Scope of utility model registration request] A plug with a cover in which a contact is covered with a cylindrical electrically insulating cover, the cover has an electrically insulating core that is removably attached to the cover, and the tip of the core is A plug characterized in that a contact is disposed on the outer periphery of the core.